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review.shift-gmbh.com / SHIFTPHONES / mainline / linux / a254a9da455c171441ab3a76ed8f5d1e9412e15f / . / fs / xfs / libxfs / xfs_bmap.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_sb.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_dir2.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_trans.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_bmap_util.h"
#include "xfs_bmap_btree.h"
#include "xfs_rtalloc.h"
#include "xfs_errortag.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
#include "xfs_trace.h"
#include "xfs_attr_leaf.h"
#include "xfs_filestream.h"
#include "xfs_rmap.h"
#include "xfs_ag.h"
#include "xfs_ag_resv.h"
#include "xfs_refcount.h"
#include "xfs_icache.h"
#include "xfs_iomap.h"
struct kmem_cache *xfs_bmap_intent_cache;
/*
* Miscellaneous helper functions
*/
/*
* Compute and fill in the value of the maximum depth of a bmap btree
* in this filesystem. Done once, during mount.
*/
void
xfs_bmap_compute_maxlevels(
xfs_mount_t *mp, /* file system mount structure */
int whichfork) /* data or attr fork */
{
int level; /* btree level */
uint maxblocks; /* max blocks at this level */
uint maxleafents; /* max leaf entries possible */
int maxrootrecs; /* max records in root block */
int minleafrecs; /* min records in leaf block */
int minnoderecs; /* min records in node block */
int sz; /* root block size */
/*
* The maximum number of extents in a file, hence the maximum number of
* leaf entries, is controlled by the size of the on-disk extent count,
* either a signed 32-bit number for the data fork, or a signed 16-bit
* number for the attr fork.
*
* Note that we can no longer assume that if we are in ATTR1 that the
* fork offset of all the inodes will be
* (xfs_default_attroffset(ip) >> 3) because we could have mounted with
* ATTR2 and then mounted back with ATTR1, keeping the i_forkoff's fixed
* but probably at various positions. Therefore, for both ATTR1 and
* ATTR2 we have to assume the worst case scenario of a minimum size
* available.
*/
if (whichfork == XFS_DATA_FORK) {
maxleafents = MAXEXTNUM;
sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
} else {
maxleafents = MAXAEXTNUM;
sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
}
maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
minleafrecs = mp->m_bmap_dmnr[0];
minnoderecs = mp->m_bmap_dmnr[1];
maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
for (level = 1; maxblocks > 1; level++) {
if (maxblocks <= maxrootrecs)
maxblocks = 1;
else
maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
}
mp->m_bm_maxlevels[whichfork] = level;
ASSERT(mp->m_bm_maxlevels[whichfork] <= xfs_bmbt_maxlevels_ondisk());
}
unsigned int
xfs_bmap_compute_attr_offset(
struct xfs_mount *mp)
{
if (mp->m_sb.sb_inodesize == 256)
return XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS);
return XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
}
STATIC int /* error */
xfs_bmbt_lookup_eq(
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec,
int *stat) /* success/failure */
{
cur->bc_rec.b = *irec;
return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}
STATIC int /* error */
xfs_bmbt_lookup_first(
struct xfs_btree_cur *cur,
int *stat) /* success/failure */
{
cur->bc_rec.b.br_startoff = 0;
cur->bc_rec.b.br_startblock = 0;
cur->bc_rec.b.br_blockcount = 0;
return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
}
/*
* Check if the inode needs to be converted to btree format.
*/
static inline bool xfs_bmap_needs_btree(struct xfs_inode *ip, int whichfork)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
return whichfork != XFS_COW_FORK &&
ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Check if the inode should be converted to extent format.
*/
static inline bool xfs_bmap_wants_extents(struct xfs_inode *ip, int whichfork)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
return whichfork != XFS_COW_FORK &&
ifp->if_format == XFS_DINODE_FMT_BTREE &&
ifp->if_nextents <= XFS_IFORK_MAXEXT(ip, whichfork);
}
/*
* Update the record referred to by cur to the value given by irec
* This either works (return 0) or gets an EFSCORRUPTED error.
*/
STATIC int
xfs_bmbt_update(
struct xfs_btree_cur *cur,
struct xfs_bmbt_irec *irec)
{
union xfs_btree_rec rec;
xfs_bmbt_disk_set_all(&rec.bmbt, irec);
return xfs_btree_update(cur, &rec);
}
/*
* Compute the worst-case number of indirect blocks that will be used
* for ip's delayed extent of length "len".
*/
STATIC xfs_filblks_t
xfs_bmap_worst_indlen(
xfs_inode_t *ip, /* incore inode pointer */
xfs_filblks_t len) /* delayed extent length */
{
int level; /* btree level number */
int maxrecs; /* maximum record count at this level */
xfs_mount_t *mp; /* mount structure */
xfs_filblks_t rval; /* return value */
mp = ip->i_mount;
maxrecs = mp->m_bmap_dmxr[0];
for (level = 0, rval = 0;
level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
level++) {
len += maxrecs - 1;
do_div(len, maxrecs);
rval += len;
if (len == 1)
return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
level - 1;
if (level == 0)
maxrecs = mp->m_bmap_dmxr[1];
}
return rval;
}
/*
* Calculate the default attribute fork offset for newly created inodes.
*/
uint
xfs_default_attroffset(
struct xfs_inode *ip)
{
if (ip->i_df.if_format == XFS_DINODE_FMT_DEV)
return roundup(sizeof(xfs_dev_t), 8);
return M_IGEO(ip->i_mount)->attr_fork_offset;
}
/*
* Helper routine to reset inode i_forkoff field when switching attribute fork
* from local to extent format - we reset it where possible to make space
* available for inline data fork extents.
*/
STATIC void
xfs_bmap_forkoff_reset(
xfs_inode_t *ip,
int whichfork)
{
if (whichfork == XFS_ATTR_FORK &&
ip->i_df.if_format != XFS_DINODE_FMT_DEV &&
ip->i_df.if_format != XFS_DINODE_FMT_BTREE) {
uint dfl_forkoff = xfs_default_attroffset(ip) >> 3;
if (dfl_forkoff > ip->i_forkoff)
ip->i_forkoff = dfl_forkoff;
}
}
#ifdef DEBUG
STATIC struct xfs_buf *
xfs_bmap_get_bp(
struct xfs_btree_cur *cur,
xfs_fsblock_t bno)
{
struct xfs_log_item *lip;
int i;
if (!cur)
return NULL;
for (i = 0; i < cur->bc_maxlevels; i++) {
if (!cur->bc_levels[i].bp)
break;
if (xfs_buf_daddr(cur->bc_levels[i].bp) == bno)
return cur->bc_levels[i].bp;
}
/* Chase down all the log items to see if the bp is there */
list_for_each_entry(lip, &cur->bc_tp->t_items, li_trans) {
struct xfs_buf_log_item *bip = (struct xfs_buf_log_item *)lip;
if (bip->bli_item.li_type == XFS_LI_BUF &&
xfs_buf_daddr(bip->bli_buf) == bno)
return bip->bli_buf;
}
return NULL;
}
STATIC void
xfs_check_block(
struct xfs_btree_block *block,
xfs_mount_t *mp,
int root,
short sz)
{
int i, j, dmxr;
__be64 *pp, *thispa; /* pointer to block address */
xfs_bmbt_key_t *prevp, *keyp;
ASSERT(be16_to_cpu(block->bb_level) > 0);
prevp = NULL;
for( i = 1; i <= xfs_btree_get_numrecs(block); i++) {
dmxr = mp->m_bmap_dmxr[0];
keyp = XFS_BMBT_KEY_ADDR(mp, block, i);
if (prevp) {
ASSERT(be64_to_cpu(prevp->br_startoff) <
be64_to_cpu(keyp->br_startoff));
}
prevp = keyp;
/*
* Compare the block numbers to see if there are dups.
*/
if (root)
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, i, sz);
else
pp = XFS_BMBT_PTR_ADDR(mp, block, i, dmxr);
for (j = i+1; j <= be16_to_cpu(block->bb_numrecs); j++) {
if (root)
thispa = XFS_BMAP_BROOT_PTR_ADDR(mp, block, j, sz);
else
thispa = XFS_BMBT_PTR_ADDR(mp, block, j, dmxr);
if (*thispa == *pp) {
xfs_warn(mp, "%s: thispa(%d) == pp(%d) %Ld",
__func__, j, i,
(unsigned long long)be64_to_cpu(*thispa));
xfs_err(mp, "%s: ptrs are equal in node\n",
__func__);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
}
}
}
}
/*
* Check that the extents for the inode ip are in the right order in all
* btree leaves. THis becomes prohibitively expensive for large extent count
* files, so don't bother with inodes that have more than 10,000 extents in
* them. The btree record ordering checks will still be done, so for such large
* bmapbt constructs that is going to catch most corruptions.
*/
STATIC void
xfs_bmap_check_leaf_extents(
struct xfs_btree_cur *cur, /* btree cursor or null */
xfs_inode_t *ip, /* incore inode pointer */
int whichfork) /* data or attr fork */
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_block *block; /* current btree block */
xfs_fsblock_t bno; /* block # of "block" */
struct xfs_buf *bp; /* buffer for "block" */
int error; /* error return value */
xfs_extnum_t i=0, j; /* index into the extents list */
int level; /* btree level, for checking */
__be64 *pp; /* pointer to block address */
xfs_bmbt_rec_t *ep; /* pointer to current extent */
xfs_bmbt_rec_t last = {0, 0}; /* last extent in prev block */
xfs_bmbt_rec_t *nextp; /* pointer to next extent */
int bp_release = 0;
if (ifp->if_format != XFS_DINODE_FMT_BTREE)
return;
/* skip large extent count inodes */
if (ip->i_df.if_nextents > 10000)
return;
bno = NULLFSBLOCK;
block = ifp->if_broot;
/*
* Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
*/
level = be16_to_cpu(block->bb_level);
ASSERT(level > 0);
xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
bno = be64_to_cpu(*pp);
ASSERT(bno != NULLFSBLOCK);
ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
/*
* Go down the tree until leaf level is reached, following the first
* pointer (leftmost) at each level.
*/
while (level-- > 0) {
/* See if buf is in cur first */
bp_release = 0;
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (!bp) {
bp_release = 1;
error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
if (level == 0)
break;
/*
* Check this block for basic sanity (increasing keys and
* no duplicate blocks).
*/
xfs_check_block(block, mp, 0, 0);
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
bno = be64_to_cpu(*pp);
if (XFS_IS_CORRUPT(mp, !xfs_verify_fsbno(mp, bno))) {
error = -EFSCORRUPTED;
goto error0;
}
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
}
/*
* Here with bp and block set to the leftmost leaf node in the tree.
*/
i = 0;
/*
* Loop over all leaf nodes checking that all extents are in the right order.
*/
for (;;) {
xfs_fsblock_t nextbno;
xfs_extnum_t num_recs;
num_recs = xfs_btree_get_numrecs(block);
/*
* Read-ahead the next leaf block, if any.
*/
nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
/*
* Check all the extents to make sure they are OK.
* If we had a previous block, the last entry should
* conform with the first entry in this one.
*/
ep = XFS_BMBT_REC_ADDR(mp, block, 1);
if (i) {
ASSERT(xfs_bmbt_disk_get_startoff(&last) +
xfs_bmbt_disk_get_blockcount(&last) <=
xfs_bmbt_disk_get_startoff(ep));
}
for (j = 1; j < num_recs; j++) {
nextp = XFS_BMBT_REC_ADDR(mp, block, j + 1);
ASSERT(xfs_bmbt_disk_get_startoff(ep) +
xfs_bmbt_disk_get_blockcount(ep) <=
xfs_bmbt_disk_get_startoff(nextp));
ep = nextp;
}
last = *ep;
i += num_recs;
if (bp_release) {
bp_release = 0;
xfs_trans_brelse(NULL, bp);
}
bno = nextbno;
/*
* If we've reached the end, stop.
*/
if (bno == NULLFSBLOCK)
break;
bp_release = 0;
bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
if (!bp) {
bp_release = 1;
error = xfs_btree_read_bufl(mp, NULL, bno, &bp,
XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
goto error_norelse;
}
block = XFS_BUF_TO_BLOCK(bp);
}
return;
error0:
xfs_warn(mp, "%s: at error0", __func__);
if (bp_release)
xfs_trans_brelse(NULL, bp);
error_norelse:
xfs_warn(mp, "%s: BAD after btree leaves for %d extents",
__func__, i);
xfs_err(mp, "%s: CORRUPTED BTREE OR SOMETHING", __func__);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
return;
}
/*
* Validate that the bmbt_irecs being returned from bmapi are valid
* given the caller's original parameters. Specifically check the
* ranges of the returned irecs to ensure that they only extend beyond
* the given parameters if the XFS_BMAPI_ENTIRE flag was set.
*/
STATIC void
xfs_bmap_validate_ret(
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
xfs_bmbt_irec_t *mval,
int nmap,
int ret_nmap)
{
int i; /* index to map values */
ASSERT(ret_nmap <= nmap);
for (i = 0; i < ret_nmap; i++) {
ASSERT(mval[i].br_blockcount > 0);
if (!(flags & XFS_BMAPI_ENTIRE)) {
ASSERT(mval[i].br_startoff >= bno);
ASSERT(mval[i].br_blockcount <= len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
bno + len);
} else {
ASSERT(mval[i].br_startoff < bno + len);
ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
bno);
}
ASSERT(i == 0 ||
mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
mval[i].br_startoff);
ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
mval[i].br_startblock != HOLESTARTBLOCK);
ASSERT(mval[i].br_state == XFS_EXT_NORM ||
mval[i].br_state == XFS_EXT_UNWRITTEN);
}
}
#else
#define xfs_bmap_check_leaf_extents(cur, ip, whichfork) do { } while (0)
#define xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap) do { } while (0)
#endif /* DEBUG */
/*
* Inode fork format manipulation functions
*/
/*
* Convert the inode format to extent format if it currently is in btree format,
* but the extent list is small enough that it fits into the extent format.
*
* Since the extents are already in-core, all we have to do is give up the space
* for the btree root and pitch the leaf block.
*/
STATIC int /* error */
xfs_bmap_btree_to_extents(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
struct xfs_btree_cur *cur, /* btree cursor */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_btree_block *rblock = ifp->if_broot;
struct xfs_btree_block *cblock;/* child btree block */
xfs_fsblock_t cbno; /* child block number */
struct xfs_buf *cbp; /* child block's buffer */
int error; /* error return value */
__be64 *pp; /* ptr to block address */
struct xfs_owner_info oinfo;
/* check if we actually need the extent format first: */
if (!xfs_bmap_wants_extents(ip, whichfork))
return 0;
ASSERT(cur);
ASSERT(whichfork != XFS_COW_FORK);
ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE);
ASSERT(be16_to_cpu(rblock->bb_level) == 1);
ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
cbno = be64_to_cpu(*pp);
#ifdef DEBUG
if (XFS_IS_CORRUPT(cur->bc_mp, !xfs_btree_check_lptr(cur, cbno, 1)))
return -EFSCORRUPTED;
#endif
error = xfs_btree_read_bufl(mp, tp, cbno, &cbp, XFS_BMAP_BTREE_REF,
&xfs_bmbt_buf_ops);
if (error)
return error;
cblock = XFS_BUF_TO_BLOCK(cbp);
if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
return error;
xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, whichfork);
xfs_free_extent_later(cur->bc_tp, cbno, 1, &oinfo);
ip->i_nblocks--;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, cbp);
if (cur->bc_levels[0].bp == cbp)
cur->bc_levels[0].bp = NULL;
xfs_iroot_realloc(ip, -1, whichfork);
ASSERT(ifp->if_broot == NULL);
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
*logflagsp |= XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
return 0;
}
/*
* Convert an extents-format file into a btree-format file.
* The new file will have a root block (in the inode) and a single child block.
*/
STATIC int /* error */
xfs_bmap_extents_to_btree(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
struct xfs_btree_cur **curp, /* cursor returned to caller */
int wasdel, /* converting a delayed alloc */
int *logflagsp, /* inode logging flags */
int whichfork) /* data or attr fork */
{
struct xfs_btree_block *ablock; /* allocated (child) bt block */
struct xfs_buf *abp; /* buffer for ablock */
struct xfs_alloc_arg args; /* allocation arguments */
struct xfs_bmbt_rec *arp; /* child record pointer */
struct xfs_btree_block *block; /* btree root block */
struct xfs_btree_cur *cur; /* bmap btree cursor */
int error; /* error return value */
struct xfs_ifork *ifp; /* inode fork pointer */
struct xfs_bmbt_key *kp; /* root block key pointer */
struct xfs_mount *mp; /* mount structure */
xfs_bmbt_ptr_t *pp; /* root block address pointer */
struct xfs_iext_cursor icur;
struct xfs_bmbt_irec rec;
xfs_extnum_t cnt = 0;
mp = ip->i_mount;
ASSERT(whichfork != XFS_COW_FORK);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_format == XFS_DINODE_FMT_EXTENTS);
/*
* Make space in the inode incore. This needs to be undone if we fail
* to expand the root.
*/
xfs_iroot_realloc(ip, 1, whichfork);
/*
* Fill in the root.
*/
block = ifp->if_broot;
xfs_btree_init_block_int(mp, block, XFS_BUF_DADDR_NULL,
XFS_BTNUM_BMAP, 1, 1, ip->i_ino,
XFS_BTREE_LONG_PTRS);
/*
* Need a cursor. Can't allocate until bb_level is filled in.
*/
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_ino.flags = wasdel ? XFS_BTCUR_BMBT_WASDEL : 0;
/*
* Convert to a btree with two levels, one record in root.
*/
ifp->if_format = XFS_DINODE_FMT_BTREE;
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = mp;
xfs_rmap_ino_bmbt_owner(&args.oinfo, ip->i_ino, whichfork);
if (tp->t_firstblock == NULLFSBLOCK) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
} else if (tp->t_flags & XFS_TRANS_LOWMODE) {
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = tp->t_firstblock;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.fsbno = tp->t_firstblock;
}
args.minlen = args.maxlen = args.prod = 1;
args.wasdel = wasdel;
*logflagsp = 0;
error = xfs_alloc_vextent(&args);
if (error)
goto out_root_realloc;
if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
error = -ENOSPC;
goto out_root_realloc;
}
/*
* Allocation can't fail, the space was reserved.
*/
ASSERT(tp->t_firstblock == NULLFSBLOCK ||
args.agno >= XFS_FSB_TO_AGNO(mp, tp->t_firstblock));
tp->t_firstblock = args.fsbno;
cur->bc_ino.allocated++;
ip->i_nblocks++;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
XFS_FSB_TO_DADDR(mp, args.fsbno),
mp->m_bsize, 0, &abp);
if (error)
goto out_unreserve_dquot;
/*
* Fill in the child block.
*/
abp->b_ops = &xfs_bmbt_buf_ops;
ablock = XFS_BUF_TO_BLOCK(abp);
xfs_btree_init_block_int(mp, ablock, xfs_buf_daddr(abp),
XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
XFS_BTREE_LONG_PTRS);
for_each_xfs_iext(ifp, &icur, &rec) {
if (isnullstartblock(rec.br_startblock))
continue;
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1 + cnt);
xfs_bmbt_disk_set_all(arp, &rec);
cnt++;
}
ASSERT(cnt == ifp->if_nextents);
xfs_btree_set_numrecs(ablock, cnt);
/*
* Fill in the root key and pointer.
*/
kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
be16_to_cpu(block->bb_level)));
*pp = cpu_to_be64(args.fsbno);
/*
* Do all this logging at the end so that
* the root is at the right level.
*/
xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
ASSERT(*curp == NULL);
*curp = cur;
*logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
return 0;
out_unreserve_dquot:
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
out_root_realloc:
xfs_iroot_realloc(ip, -1, whichfork);
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
ASSERT(ifp->if_broot == NULL);
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Convert a local file to an extents file.
* This code is out of bounds for data forks of regular files,
* since the file data needs to get logged so things will stay consistent.
* (The bmap-level manipulations are ok, though).
*/
void
xfs_bmap_local_to_extents_empty(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(whichfork != XFS_COW_FORK);
ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
ASSERT(ifp->if_bytes == 0);
ASSERT(ifp->if_nextents == 0);
xfs_bmap_forkoff_reset(ip, whichfork);
ifp->if_u1.if_root = NULL;
ifp->if_height = 0;
ifp->if_format = XFS_DINODE_FMT_EXTENTS;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
}
STATIC int /* error */
xfs_bmap_local_to_extents(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
xfs_extlen_t total, /* total blocks needed by transaction */
int *logflagsp, /* inode logging flags */
int whichfork,
void (*init_fn)(struct xfs_trans *tp,
struct xfs_buf *bp,
struct xfs_inode *ip,
struct xfs_ifork *ifp))
{
int error = 0;
int flags; /* logging flags returned */
struct xfs_ifork *ifp; /* inode fork pointer */
xfs_alloc_arg_t args; /* allocation arguments */
struct xfs_buf *bp; /* buffer for extent block */
struct xfs_bmbt_irec rec;
struct xfs_iext_cursor icur;
/*
* We don't want to deal with the case of keeping inode data inline yet.
* So sending the data fork of a regular inode is invalid.
*/
ASSERT(!(S_ISREG(VFS_I(ip)->i_mode) && whichfork == XFS_DATA_FORK));
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(ifp->if_format == XFS_DINODE_FMT_LOCAL);
if (!ifp->if_bytes) {
xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
flags = XFS_ILOG_CORE;
goto done;
}
flags = 0;
error = 0;
memset(&args, 0, sizeof(args));
args.tp = tp;
args.mp = ip->i_mount;
xfs_rmap_ino_owner(&args.oinfo, ip->i_ino, whichfork, 0);
/*
* Allocate a block. We know we need only one, since the
* file currently fits in an inode.
*/
if (tp->t_firstblock == NULLFSBLOCK) {
args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
args.type = XFS_ALLOCTYPE_START_BNO;
} else {
args.fsbno = tp->t_firstblock;
args.type = XFS_ALLOCTYPE_NEAR_BNO;
}
args.total = total;
args.minlen = args.maxlen = args.prod = 1;
error = xfs_alloc_vextent(&args);
if (error)
goto done;
/* Can't fail, the space was reserved. */
ASSERT(args.fsbno != NULLFSBLOCK);
ASSERT(args.len == 1);
tp->t_firstblock = args.fsbno;
error = xfs_trans_get_buf(tp, args.mp->m_ddev_targp,
XFS_FSB_TO_DADDR(args.mp, args.fsbno),
args.mp->m_bsize, 0, &bp);
if (error)
goto done;
/*
* Initialize the block, copy the data and log the remote buffer.
*
* The callout is responsible for logging because the remote format
* might differ from the local format and thus we don't know how much to
* log here. Note that init_fn must also set the buffer log item type
* correctly.
*/
init_fn(tp, bp, ip, ifp);
/* account for the change in fork size */
xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
xfs_bmap_local_to_extents_empty(tp, ip, whichfork);
flags |= XFS_ILOG_CORE;
ifp->if_u1.if_root = NULL;
ifp->if_height = 0;
rec.br_startoff = 0;
rec.br_startblock = args.fsbno;
rec.br_blockcount = 1;
rec.br_state = XFS_EXT_NORM;
xfs_iext_first(ifp, &icur);
xfs_iext_insert(ip, &icur, &rec, 0);
ifp->if_nextents = 1;
ip->i_nblocks = 1;
xfs_trans_mod_dquot_byino(tp, ip,
XFS_TRANS_DQ_BCOUNT, 1L);
flags |= xfs_ilog_fext(whichfork);
done:
*logflagsp = flags;
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle btree format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_btree(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode pointer */
int *flags) /* inode logging flags */
{
struct xfs_btree_block *block = ip->i_df.if_broot;
struct xfs_btree_cur *cur; /* btree cursor */
int error; /* error return value */
xfs_mount_t *mp; /* file system mount struct */
int stat; /* newroot status */
mp = ip->i_mount;
if (XFS_BMAP_BMDR_SPACE(block) <= XFS_IFORK_DSIZE(ip))
*flags |= XFS_ILOG_DBROOT;
else {
cur = xfs_bmbt_init_cursor(mp, tp, ip, XFS_DATA_FORK);
error = xfs_bmbt_lookup_first(cur, &stat);
if (error)
goto error0;
/* must be at least one entry */
if (XFS_IS_CORRUPT(mp, stat != 1)) {
error = -EFSCORRUPTED;
goto error0;
}
if ((error = xfs_btree_new_iroot(cur, flags, &stat)))
goto error0;
if (stat == 0) {
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
return -ENOSPC;
}
cur->bc_ino.allocated = 0;
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
}
return 0;
error0:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle extents format files.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_extents(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
int *flags) /* inode logging flags */
{
struct xfs_btree_cur *cur; /* bmap btree cursor */
int error; /* error return value */
if (ip->i_df.if_nextents * sizeof(struct xfs_bmbt_rec) <=
XFS_IFORK_DSIZE(ip))
return 0;
cur = NULL;
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0, flags,
XFS_DATA_FORK);
if (cur) {
cur->bc_ino.allocated = 0;
xfs_btree_del_cursor(cur, error);
}
return error;
}
/*
* Called from xfs_bmap_add_attrfork to handle local format files. Each
* different data fork content type needs a different callout to do the
* conversion. Some are basic and only require special block initialisation
* callouts for the data formating, others (directories) are so specialised they
* handle everything themselves.
*
* XXX (dgc): investigate whether directory conversion can use the generic
* formatting callout. It should be possible - it's just a very complex
* formatter.
*/
STATIC int /* error */
xfs_bmap_add_attrfork_local(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode pointer */
int *flags) /* inode logging flags */
{
struct xfs_da_args dargs; /* args for dir/attr code */
if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
return 0;
if (S_ISDIR(VFS_I(ip)->i_mode)) {
memset(&dargs, 0, sizeof(dargs));
dargs.geo = ip->i_mount->m_dir_geo;
dargs.dp = ip;
dargs.total = dargs.geo->fsbcount;
dargs.whichfork = XFS_DATA_FORK;
dargs.trans = tp;
return xfs_dir2_sf_to_block(&dargs);
}
if (S_ISLNK(VFS_I(ip)->i_mode))
return xfs_bmap_local_to_extents(tp, ip, 1, flags,
XFS_DATA_FORK,
xfs_symlink_local_to_remote);
/* should only be called for types that support local format data */
ASSERT(0);
return -EFSCORRUPTED;
}
/*
* Set an inode attr fork offset based on the format of the data fork.
*/
static int
xfs_bmap_set_attrforkoff(
struct xfs_inode *ip,
int size,
int *version)
{
int default_size = xfs_default_attroffset(ip) >> 3;
switch (ip->i_df.if_format) {
case XFS_DINODE_FMT_DEV:
ip->i_forkoff = default_size;
break;
case XFS_DINODE_FMT_LOCAL:
case XFS_DINODE_FMT_EXTENTS:
case XFS_DINODE_FMT_BTREE:
ip->i_forkoff = xfs_attr_shortform_bytesfit(ip, size);
if (!ip->i_forkoff)
ip->i_forkoff = default_size;
else if (xfs_has_attr2(ip->i_mount) && version)
*version = 2;
break;
default:
ASSERT(0);
return -EINVAL;
}
return 0;
}
/*
* Convert inode from non-attributed to attributed.
* Must not be in a transaction, ip must not be locked.
*/
int /* error code */
xfs_bmap_add_attrfork(
xfs_inode_t *ip, /* incore inode pointer */
int size, /* space new attribute needs */
int rsvd) /* xact may use reserved blks */
{
xfs_mount_t *mp; /* mount structure */
xfs_trans_t *tp; /* transaction pointer */
int blks; /* space reservation */
int version = 1; /* superblock attr version */
int logflags; /* logging flags */
int error; /* error return value */
ASSERT(XFS_IFORK_Q(ip) == 0);
mp = ip->i_mount;
ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
blks = XFS_ADDAFORK_SPACE_RES(mp);
error = xfs_trans_alloc_inode(ip, &M_RES(mp)->tr_addafork, blks, 0,
rsvd, &tp);
if (error)
return error;
if (XFS_IFORK_Q(ip))
goto trans_cancel;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
error = xfs_bmap_set_attrforkoff(ip, size, &version);
if (error)
goto trans_cancel;
ASSERT(ip->i_afp == NULL);
ip->i_afp = xfs_ifork_alloc(XFS_DINODE_FMT_EXTENTS, 0);
logflags = 0;
switch (ip->i_df.if_format) {
case XFS_DINODE_FMT_LOCAL:
error = xfs_bmap_add_attrfork_local(tp, ip, &logflags);
break;
case XFS_DINODE_FMT_EXTENTS:
error = xfs_bmap_add_attrfork_extents(tp, ip, &logflags);
break;
case XFS_DINODE_FMT_BTREE:
error = xfs_bmap_add_attrfork_btree(tp, ip, &logflags);
break;
default:
error = 0;
break;
}
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (error)
goto trans_cancel;
if (!xfs_has_attr(mp) ||
(!xfs_has_attr2(mp) && version == 2)) {
bool log_sb = false;
spin_lock(&mp->m_sb_lock);
if (!xfs_has_attr(mp)) {
xfs_add_attr(mp);
log_sb = true;
}
if (!xfs_has_attr2(mp) && version == 2) {
xfs_add_attr2(mp);
log_sb = true;
}
spin_unlock(&mp->m_sb_lock);
if (log_sb)
xfs_log_sb(tp);
}
error = xfs_trans_commit(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
trans_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
/*
* Internal and external extent tree search functions.
*/
struct xfs_iread_state {
struct xfs_iext_cursor icur;
xfs_extnum_t loaded;
};
/* Stuff every bmbt record from this block into the incore extent map. */
static int
xfs_iread_bmbt_block(
struct xfs_btree_cur *cur,
int level,
void *priv)
{
struct xfs_iread_state *ir = priv;
struct xfs_mount *mp = cur->bc_mp;
struct xfs_inode *ip = cur->bc_ino.ip;
struct xfs_btree_block *block;
struct xfs_buf *bp;
struct xfs_bmbt_rec *frp;
xfs_extnum_t num_recs;
xfs_extnum_t j;
int whichfork = cur->bc_ino.whichfork;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
block = xfs_btree_get_block(cur, level, &bp);
/* Abort if we find more records than nextents. */
num_recs = xfs_btree_get_numrecs(block);
if (unlikely(ir->loaded + num_recs > ifp->if_nextents)) {
xfs_warn(ip->i_mount, "corrupt dinode %llu, (btree extents).",
(unsigned long long)ip->i_ino);
xfs_inode_verifier_error(ip, -EFSCORRUPTED, __func__, block,
sizeof(*block), __this_address);
return -EFSCORRUPTED;
}
/* Copy records into the incore cache. */
frp = XFS_BMBT_REC_ADDR(mp, block, 1);
for (j = 0; j < num_recs; j++, frp++, ir->loaded++) {
struct xfs_bmbt_irec new;
xfs_failaddr_t fa;
xfs_bmbt_disk_get_all(frp, &new);
fa = xfs_bmap_validate_extent(ip, whichfork, &new);
if (fa) {
xfs_inode_verifier_error(ip, -EFSCORRUPTED,
"xfs_iread_extents(2)", frp,
sizeof(*frp), fa);
return -EFSCORRUPTED;
}
xfs_iext_insert(ip, &ir->icur, &new,
xfs_bmap_fork_to_state(whichfork));
trace_xfs_read_extent(ip, &ir->icur,
xfs_bmap_fork_to_state(whichfork), _THIS_IP_);
xfs_iext_next(ifp, &ir->icur);
}
return 0;
}
/*
* Read in extents from a btree-format inode.
*/
int
xfs_iread_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork)
{
struct xfs_iread_state ir;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_btree_cur *cur;
int error;
if (!xfs_need_iread_extents(ifp))
return 0;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ir.loaded = 0;
xfs_iext_first(ifp, &ir.icur);
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
error = xfs_btree_visit_blocks(cur, xfs_iread_bmbt_block,
XFS_BTREE_VISIT_RECORDS, &ir);
xfs_btree_del_cursor(cur, error);
if (error)
goto out;
if (XFS_IS_CORRUPT(mp, ir.loaded != ifp->if_nextents)) {
error = -EFSCORRUPTED;
goto out;
}
ASSERT(ir.loaded == xfs_iext_count(ifp));
return 0;
out:
xfs_iext_destroy(ifp);
return error;
}
/*
* Returns the relative block number of the first unused block(s) in the given
* fork with at least "len" logically contiguous blocks free. This is the
* lowest-address hole if the fork has holes, else the first block past the end
* of fork. Return 0 if the fork is currently local (in-inode).
*/
int /* error */
xfs_bmap_first_unused(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_extlen_t len, /* size of hole to find */
xfs_fileoff_t *first_unused, /* unused block */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
xfs_fileoff_t lastaddr = 0;
xfs_fileoff_t lowest, max;
int error;
if (ifp->if_format == XFS_DINODE_FMT_LOCAL) {
*first_unused = 0;
return 0;
}
ASSERT(xfs_ifork_has_extents(ifp));
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
lowest = max = *first_unused;
for_each_xfs_iext(ifp, &icur, &got) {
/*
* See if the hole before this extent will work.
*/
if (got.br_startoff >= lowest + len &&
got.br_startoff - max >= len)
break;
lastaddr = got.br_startoff + got.br_blockcount;
max = XFS_FILEOFF_MAX(lastaddr, lowest);
}
*first_unused = max;
return 0;
}
/*
* Returns the file-relative block number of the last block - 1 before
* last_block (input value) in the file.
* This is not based on i_size, it is based on the extent records.
* Returns 0 for local files, as they do not have extent records.
*/
int /* error */
xfs_bmap_last_before(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t *last_block, /* last block */
int whichfork) /* data or attr fork */
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
int error;
switch (ifp->if_format) {
case XFS_DINODE_FMT_LOCAL:
*last_block = 0;
return 0;
case XFS_DINODE_FMT_BTREE:
case XFS_DINODE_FMT_EXTENTS:
break;
default:
ASSERT(0);
return -EFSCORRUPTED;
}
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
if (!xfs_iext_lookup_extent_before(ip, ifp, last_block, &icur, &got))
*last_block = 0;
return 0;
}
int
xfs_bmap_last_extent(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
struct xfs_bmbt_irec *rec,
int *is_empty)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_iext_cursor icur;
int error;
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
xfs_iext_last(ifp, &icur);
if (!xfs_iext_get_extent(ifp, &icur, rec))
*is_empty = 1;
else
*is_empty = 0;
return 0;
}
/*
* Check the last inode extent to determine whether this allocation will result
* in blocks being allocated at the end of the file. When we allocate new data
* blocks at the end of the file which do not start at the previous data block,
* we will try to align the new blocks at stripe unit boundaries.
*
* Returns 1 in bma->aeof if the file (fork) is empty as any new write will be
* at, or past the EOF.
*/
STATIC int
xfs_bmap_isaeof(
struct xfs_bmalloca *bma,
int whichfork)
{
struct xfs_bmbt_irec rec;
int is_empty;
int error;
bma->aeof = false;
error = xfs_bmap_last_extent(NULL, bma->ip, whichfork, &rec,
&is_empty);
if (error)
return error;
if (is_empty) {
bma->aeof = true;
return 0;
}
/*
* Check if we are allocation or past the last extent, or at least into
* the last delayed allocated extent.
*/
bma->aeof = bma->offset >= rec.br_startoff + rec.br_blockcount ||
(bma->offset >= rec.br_startoff &&
isnullstartblock(rec.br_startblock));
return 0;
}
/*
* Returns the file-relative block number of the first block past eof in
* the file. This is not based on i_size, it is based on the extent records.
* Returns 0 for local files, as they do not have extent records.
*/
int
xfs_bmap_last_offset(
struct xfs_inode *ip,
xfs_fileoff_t *last_block,
int whichfork)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec rec;
int is_empty;
int error;
*last_block = 0;
if (ifp->if_format == XFS_DINODE_FMT_LOCAL)
return 0;
if (XFS_IS_CORRUPT(ip->i_mount, !xfs_ifork_has_extents(ifp)))
return -EFSCORRUPTED;
error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, &is_empty);
if (error || is_empty)
return error;
*last_block = rec.br_startoff + rec.br_blockcount;
return 0;
}
/*
* Extent tree manipulation functions used during allocation.
*/
/*
* Convert a delayed allocation to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_delay_real(
struct xfs_bmalloca *bma,
int whichfork)
{
struct xfs_mount *mp = bma->ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
struct xfs_bmbt_irec *new = &bma->got;
int error; /* error return value */
int i; /* temp state */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = xfs_bmap_fork_to_state(whichfork);
xfs_filblks_t da_new; /* new count del alloc blocks used */
xfs_filblks_t da_old; /* old count del alloc blocks used */
xfs_filblks_t temp=0; /* value for da_new calculations */
int tmp_rval; /* partial logging flags */
struct xfs_bmbt_irec old;
ASSERT(whichfork != XFS_ATTR_FORK);
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!bma->cur ||
(bma->cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
XFS_STATS_INC(mp, xs_add_exlist);
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
/*
* Set up a bunch of variables to make the tests simpler.
*/
xfs_iext_get_extent(ifp, &bma->icur, &PREV);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(isnullstartblock(PREV.br_startblock));
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
da_old = startblockval(PREV.br_startblock);
da_new = 0;
/*
* Set flags determining what part of the previous delayed allocation
* extent is being replaced by a real allocation.
*/
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (xfs_iext_peek_prev_extent(ifp, &bma->icur, &LEFT)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (xfs_iext_peek_next_extent(ifp, &bma->icur, &RIGHT)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left and right neighbors are both contiguous with new.
*/
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
ifp->if_nextents--;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_delete(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_decrement(bma->cur, 0, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The left neighbor is contiguous, the right is not.
*/
old = LEFT;
LEFT.br_blockcount += PREV.br_blockcount;
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in all of a previously delayed allocation extent.
* The right neighbor is contiguous, the left is not. Take care
* with delay -> unwritten extent allocation here because the
* delalloc record we are overwriting is always written.
*/
PREV.br_startblock = new->br_startblock;
PREV.br_blockcount += RIGHT.br_blockcount;
PREV.br_state = new->br_state;
xfs_iext_next(ifp, &bma->icur);
xfs_iext_remove(bma->ip, &bma->icur, state);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Filling in all of a previously delayed allocation extent.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
PREV.br_startblock = new->br_startblock;
PREV.br_state = new->br_state;
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is contiguous.
*/
old = LEFT;
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
LEFT.br_blockcount += new->br_blockcount;
PREV.br_blockcount = temp;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_prev(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &LEFT);
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING:
/*
* Filling in the first part of a previous delayed allocation.
* The left neighbor is not contiguous.
*/
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, 1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_ino.allocated : 0));
PREV.br_startoff = new_endoff;
PREV.br_blockcount = temp;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
xfs_iext_prev(ifp, &bma->icur);
break;
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is contiguous with the new allocation.
*/
old = RIGHT;
RIGHT.br_startoff = new->br_startoff;
RIGHT.br_startblock = new->br_startblock;
RIGHT.br_blockcount += new->br_blockcount;
if (bma->cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(bma->cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(bma->cur, &RIGHT);
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock));
PREV.br_blockcount = temp;
PREV.br_startblock = nullstartblock(da_new);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_update_extent(bma->ip, state, &bma->icur, &RIGHT);
break;
case BMAP_RIGHT_FILLING:
/*
* Filling in the last part of a previous delayed allocation.
* The right neighbor is not contiguous.
*/
xfs_iext_update_extent(bma->ip, state, &bma->icur, new);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, 1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
temp = PREV.br_blockcount - new->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(bma->ip, temp),
startblockval(PREV.br_startblock) -
(bma->cur ? bma->cur->bc_ino.allocated : 0));
PREV.br_startblock = nullstartblock(da_new);
PREV.br_blockcount = temp;
xfs_iext_insert(bma->ip, &bma->icur, &PREV, state);
xfs_iext_next(ifp, &bma->icur);
break;
case 0:
/*
* Filling in the middle part of a previous delayed allocation.
* Contiguity is impossible here.
* This case is avoided almost all the time.
*
* We start with a delayed allocation:
*
* +ddddddddddddddddddddddddddddddddddddddddddddddddddddddd+
* PREV @ idx
*
* and we are allocating:
* +rrrrrrrrrrrrrrrrr+
* new
*
* and we set it up for insertion as:
* +ddddddddddddddddddd+rrrrrrrrrrrrrrrrr+ddddddddddddddddd+
* new
* PREV @ idx LEFT RIGHT
* inserted at idx + 1
*/
old = PREV;
/* LEFT is the new middle */
LEFT = *new;
/* RIGHT is the new right */
RIGHT.br_state = PREV.br_state;
RIGHT.br_startoff = new_endoff;
RIGHT.br_blockcount =
PREV.br_startoff + PREV.br_blockcount - new_endoff;
RIGHT.br_startblock =
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
RIGHT.br_blockcount));
/* truncate PREV */
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
PREV.br_startblock =
nullstartblock(xfs_bmap_worst_indlen(bma->ip,
PREV.br_blockcount));
xfs_iext_update_extent(bma->ip, state, &bma->icur, &PREV);
xfs_iext_next(ifp, &bma->icur);
xfs_iext_insert(bma->ip, &bma->icur, &RIGHT, state);
xfs_iext_insert(bma->ip, &bma->icur, &LEFT, state);
ifp->if_nextents++;
if (bma->cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(bma->cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(bma->cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, 1, &tmp_rval, whichfork);
rval |= tmp_rval;
if (error)
goto done;
}
da_new = startblockval(PREV.br_startblock) +
startblockval(RIGHT.br_startblock);
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
ASSERT(0);
}
/* add reverse mapping unless caller opted out */
if (!(bma->flags & XFS_BMAPI_NORMAP))
xfs_rmap_map_extent(bma->tp, bma->ip, whichfork, new);
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(bma->ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(bma->cur == NULL);
error = xfs_bmap_extents_to_btree(bma->tp, bma->ip,
&bma->cur, da_old > 0, &tmp_logflags,
whichfork);
bma->logflags |= tmp_logflags;
if (error)
goto done;
}
if (da_new != da_old)
xfs_mod_delalloc(mp, (int64_t)da_new - da_old);
if (bma->cur) {
da_new += bma->cur->bc_ino.allocated;
bma->cur->bc_ino.allocated = 0;
}
/* adjust for changes in reserved delayed indirect blocks */
if (da_new != da_old) {
ASSERT(state == 0 || da_new < da_old);
error = xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new),
false);
}
xfs_bmap_check_leaf_extents(bma->cur, bma->ip, whichfork);
done:
if (whichfork != XFS_COW_FORK)
bma->logflags |= rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
}
/*
* Convert an unwritten allocation to a real allocation or vice versa.
*/
int /* error */
xfs_bmap_add_extent_unwritten_real(
struct xfs_trans *tp,
xfs_inode_t *ip, /* incore inode pointer */
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_btree_cur **curp, /* if *curp is null, not a btree */
xfs_bmbt_irec_t *new, /* new data to add to file extents */
int *logflagsp) /* inode logging flags */
{
struct xfs_btree_cur *cur; /* btree cursor */
int error; /* error return value */
int i; /* temp state */
struct xfs_ifork *ifp; /* inode fork pointer */
xfs_fileoff_t new_endoff; /* end offset of new entry */
xfs_bmbt_irec_t r[3]; /* neighbor extent entries */
/* left is 0, right is 1, prev is 2 */
int rval=0; /* return value (logging flags) */
int state = xfs_bmap_fork_to_state(whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_bmbt_irec old;
*logflagsp = 0;
cur = *curp;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(!isnullstartblock(new->br_startblock));
XFS_STATS_INC(mp, xs_add_exlist);
#define LEFT r[0]
#define RIGHT r[1]
#define PREV r[2]
/*
* Set up a bunch of variables to make the tests simpler.
*/
error = 0;
xfs_iext_get_extent(ifp, icur, &PREV);
ASSERT(new->br_state != PREV.br_state);
new_endoff = new->br_startoff + new->br_blockcount;
ASSERT(PREV.br_startoff <= new->br_startoff);
ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
/*
* Set flags determining what part of the previous oldext allocation
* extent is being replaced by a newext allocation.
*/
if (PREV.br_startoff == new->br_startoff)
state |= BMAP_LEFT_FILLING;
if (PREV.br_startoff + PREV.br_blockcount == new_endoff)
state |= BMAP_RIGHT_FILLING;
/*
* Check and set flags if this segment has a left neighbor.
* Don't set contiguous if the combined extent would be too large.
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &LEFT)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(LEFT.br_startblock))
state |= BMAP_LEFT_DELAY;
}
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
LEFT.br_state == new->br_state &&
LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
/*
* Check and set flags if this segment has a right neighbor.
* Don't set contiguous if the combined extent would be too large.
* Also check for all-three-contiguous being too large.
*/
if (xfs_iext_peek_next_extent(ifp, icur, &RIGHT)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(RIGHT.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new_endoff == RIGHT.br_startoff &&
new->br_startblock + new->br_blockcount == RIGHT.br_startblock &&
new->br_state == RIGHT.br_state &&
new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
((state & (BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING)) !=
(BMAP_LEFT_CONTIG | BMAP_LEFT_FILLING |
BMAP_RIGHT_FILLING) ||
LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
<= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the FILLING and CONTIG state bits.
*/
switch (state & (BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG |
BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left and right neighbors are both contiguous with new.
*/
LEFT.br_blockcount += PREV.br_blockcount + RIGHT.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
ifp->if_nextents -= 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The left neighbor is contiguous, the right is not.
*/
LEFT.br_blockcount += PREV.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
ifp->if_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &PREV, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting all of a previous oldext extent to newext.
* The right neighbor is contiguous, the left is not.
*/
PREV.br_blockcount += RIGHT.br_blockcount;
PREV.br_state = new->br_state;
xfs_iext_next(ifp, icur);
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &PREV);
ifp->if_nextents--;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &RIGHT, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_decrement(cur, 0, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Setting all of a previous oldext extent to newext.
* Neither the left nor right neighbors are contiguous with
* the new one.
*/
PREV.br_state = new->br_state;
xfs_iext_update_extent(ip, state, icur, &PREV);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is contiguous.
*/
LEFT.br_blockcount += new->br_blockcount;
old = PREV;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock += new->br_blockcount;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &LEFT);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_btree_decrement(cur, 0, &i);
if (error)
goto done;
error = xfs_bmbt_update(cur, &LEFT);
if (error)
goto done;
}
break;
case BMAP_LEFT_FILLING:
/*
* Setting the first part of a previous oldext extent to newext.
* The left neighbor is not contiguous.
*/
old = PREV;
PREV.br_startoff += new->br_blockcount;
PREV.br_startblock += new->br_blockcount;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_insert(ip, icur, new, state);
ifp->if_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
cur->bc_rec.b = *new;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case BMAP_RIGHT_FILLING | BMAP_RIGHT_CONTIG:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is contiguous with the new allocation.
*/
old = PREV;
PREV.br_blockcount -= new->br_blockcount;
RIGHT.br_startoff = new->br_startoff;
RIGHT.br_startblock = new->br_startblock;
RIGHT.br_blockcount += new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &RIGHT);
if (cur == NULL)
rval = XFS_ILOG_DEXT;
else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_btree_increment(cur, 0, &i);
if (error)
goto done;
error = xfs_bmbt_update(cur, &RIGHT);
if (error)
goto done;
}
break;
case BMAP_RIGHT_FILLING:
/*
* Setting the last part of a previous oldext extent to newext.
* The right neighbor is not contiguous.
*/
old = PREV;
PREV.br_blockcount -= new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, new, state);
ifp->if_nextents++;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &PREV);
if (error)
goto done;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case 0:
/*
* Setting the middle part of a previous oldext extent to
* newext. Contiguity is impossible here.
* One extent becomes three extents.
*/
old = PREV;
PREV.br_blockcount = new->br_startoff - PREV.br_startoff;
r[0] = *new;
r[1].br_startoff = new_endoff;
r[1].br_blockcount =
old.br_startoff + old.br_blockcount - new_endoff;
r[1].br_startblock = new->br_startblock + new->br_blockcount;
r[1].br_state = PREV.br_state;
xfs_iext_update_extent(ip, state, icur, &PREV);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &r[1], state);
xfs_iext_insert(ip, icur, &r[0], state);
ifp->if_nextents += 2;
if (cur == NULL)
rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
/* new right extent - oldext */
error = xfs_bmbt_update(cur, &r[1]);
if (error)
goto done;
/* new left extent - oldext */
cur->bc_rec.b = PREV;
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
/*
* Reset the cursor to the position of the new extent
* we are about to insert as we can't trust it after
* the previous insert.
*/
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
/* new middle extent - newext */
if ((error = xfs_btree_insert(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
case BMAP_LEFT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_FILLING | BMAP_RIGHT_CONTIG:
case BMAP_RIGHT_FILLING | BMAP_LEFT_CONTIG:
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
case BMAP_LEFT_CONTIG:
case BMAP_RIGHT_CONTIG:
/*
* These cases are all impossible.
*/
ASSERT(0);
}
/* update reverse mappings */
xfs_rmap_convert_extent(mp, tp, ip, whichfork, new);
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
&tmp_logflags, whichfork);
*logflagsp |= tmp_logflags;
if (error)
goto done;
}
/* clear out the allocated field, done with it now in any case. */
if (cur) {
cur->bc_ino.allocated = 0;
*curp = cur;
}
xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
done:
*logflagsp |= rval;
return error;
#undef LEFT
#undef RIGHT
#undef PREV
}
/*
* Convert a hole to a delayed allocation.
*/
STATIC void
xfs_bmap_add_extent_hole_delay(
xfs_inode_t *ip, /* incore inode pointer */
int whichfork,
struct xfs_iext_cursor *icur,
xfs_bmbt_irec_t *new) /* new data to add to file extents */
{
struct xfs_ifork *ifp; /* inode fork pointer */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_filblks_t newlen=0; /* new indirect size */
xfs_filblks_t oldlen=0; /* old indirect size */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int state = xfs_bmap_fork_to_state(whichfork);
xfs_filblks_t temp; /* temp for indirect calculations */
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(isnullstartblock(new->br_startblock));
/*
* Check and set flags if this segment has a left neighbor
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if the current (right) segment exists.
* If it doesn't exist, we're converting the hole at end-of-file.
*/
if (xfs_iext_get_extent(ifp, icur, &right)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* Set contiguity flags on the left and right neighbors.
* Don't let extents get too large, even if the pieces are contiguous.
*/
if ((state & BMAP_LEFT_VALID) && (state & BMAP_LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && (state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
(left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN)))
state |= BMAP_RIGHT_CONTIG;
/*
* Switch out based on the contiguity flags.
*/
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with delayed allocations
* on the left and on the right.
* Merge all three into a single extent record.
*/
temp = left.br_blockcount + new->br_blockcount +
right.br_blockcount;
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
left.br_startblock = nullstartblock(newlen);
left.br_blockcount = temp;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
break;
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
temp = left.br_blockcount + new->br_blockcount;
oldlen = startblockval(left.br_startblock) +
startblockval(new->br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
left.br_blockcount = temp;
left.br_startblock = nullstartblock(newlen);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
break;
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a delayed allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
temp = new->br_blockcount + right.br_blockcount;
oldlen = startblockval(new->br_startblock) +
startblockval(right.br_startblock);
newlen = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
oldlen);
right.br_startoff = new->br_startoff;
right.br_startblock = nullstartblock(newlen);
right.br_blockcount = temp;
xfs_iext_update_extent(ip, state, icur, &right);
break;
case 0:
/*
* New allocation is not contiguous with another
* delayed allocation.
* Insert a new entry.
*/
oldlen = newlen = 0;
xfs_iext_insert(ip, icur, new, state);
break;
}
if (oldlen != newlen) {
ASSERT(oldlen > newlen);
xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
false);
/*
* Nothing to do for disk quota accounting here.
*/
xfs_mod_delalloc(ip->i_mount, (int64_t)newlen - oldlen);
}
}
/*
* Convert a hole to a real allocation.
*/
STATIC int /* error */
xfs_bmap_add_extent_hole_real(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_btree_cur **curp,
struct xfs_bmbt_irec *new,
int *logflagsp,
int flags)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
struct xfs_btree_cur *cur = *curp;
int error; /* error return value */
int i; /* temp state */
xfs_bmbt_irec_t left; /* left neighbor extent entry */
xfs_bmbt_irec_t right; /* right neighbor extent entry */
int rval=0; /* return value (logging flags) */
int state = xfs_bmap_fork_to_state(whichfork);
struct xfs_bmbt_irec old;
ASSERT(!isnullstartblock(new->br_startblock));
ASSERT(!cur || !(cur->bc_ino.flags & XFS_BTCUR_BMBT_WASDEL));
XFS_STATS_INC(mp, xs_add_exlist);
/*
* Check and set flags if this segment has a left neighbor.
*/
if (xfs_iext_peek_prev_extent(ifp, icur, &left)) {
state |= BMAP_LEFT_VALID;
if (isnullstartblock(left.br_startblock))
state |= BMAP_LEFT_DELAY;
}
/*
* Check and set flags if this segment has a current value.
* Not true if we're inserting into the "hole" at eof.
*/
if (xfs_iext_get_extent(ifp, icur, &right)) {
state |= BMAP_RIGHT_VALID;
if (isnullstartblock(right.br_startblock))
state |= BMAP_RIGHT_DELAY;
}
/*
* We're inserting a real allocation between "left" and "right".
* Set the contiguity flags. Don't let extents get too large.
*/
if ((state & BMAP_LEFT_VALID) && !(state & BMAP_LEFT_DELAY) &&
left.br_startoff + left.br_blockcount == new->br_startoff &&
left.br_startblock + left.br_blockcount == new->br_startblock &&
left.br_state == new->br_state &&
left.br_blockcount + new->br_blockcount <= MAXEXTLEN)
state |= BMAP_LEFT_CONTIG;
if ((state & BMAP_RIGHT_VALID) && !(state & BMAP_RIGHT_DELAY) &&
new->br_startoff + new->br_blockcount == right.br_startoff &&
new->br_startblock + new->br_blockcount == right.br_startblock &&
new->br_state == right.br_state &&
new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
(!(state & BMAP_LEFT_CONTIG) ||
left.br_blockcount + new->br_blockcount +
right.br_blockcount <= MAXEXTLEN))
state |= BMAP_RIGHT_CONTIG;
error = 0;
/*
* Select which case we're in here, and implement it.
*/
switch (state & (BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG)) {
case BMAP_LEFT_CONTIG | BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with real allocations on the
* left and on the right.
* Merge all three into a single extent record.
*/
left.br_blockcount += new->br_blockcount + right.br_blockcount;
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
ifp->if_nextents--;
if (cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, &right, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_delete(cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_decrement(cur, 0, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &left);
if (error)
goto done;
}
break;
case BMAP_LEFT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the left.
* Merge the new allocation with the left neighbor.
*/
old = left;
left.br_blockcount += new->br_blockcount;
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, state, icur, &left);
if (cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &left);
if (error)
goto done;
}
break;
case BMAP_RIGHT_CONTIG:
/*
* New allocation is contiguous with a real allocation
* on the right.
* Merge the new allocation with the right neighbor.
*/
old = right;
right.br_startoff = new->br_startoff;
right.br_startblock = new->br_startblock;
right.br_blockcount += new->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &right);
if (cur == NULL) {
rval = xfs_ilog_fext(whichfork);
} else {
rval = 0;
error = xfs_bmbt_lookup_eq(cur, &old, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_bmbt_update(cur, &right);
if (error)
goto done;
}
break;
case 0:
/*
* New allocation is not contiguous with another
* real allocation.
* Insert a new entry.
*/
xfs_iext_insert(ip, icur, new, state);
ifp->if_nextents++;
if (cur == NULL) {
rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
} else {
rval = XFS_ILOG_CORE;
error = xfs_bmbt_lookup_eq(cur, new, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto done;
}
error = xfs_btree_insert(cur, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
break;
}
/* add reverse mapping unless caller opted out */
if (!(flags & XFS_BMAPI_NORMAP))
xfs_rmap_map_extent(tp, ip, whichfork, new);
/* convert to a btree if necessary */
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, curp, 0,
&tmp_logflags, whichfork);
*logflagsp |= tmp_logflags;
cur = *curp;
if (error)
goto done;
}
/* clear out the allocated field, done with it now in any case. */
if (cur)
cur->bc_ino.allocated = 0;
xfs_bmap_check_leaf_extents(cur, ip, whichfork);
done:
*logflagsp |= rval;
return error;
}
/*
* Functions used in the extent read, allocate and remove paths
*/
/*
* Adjust the size of the new extent based on i_extsize and rt extsize.
*/
int
xfs_bmap_extsize_align(
xfs_mount_t *mp,
xfs_bmbt_irec_t *gotp, /* next extent pointer */
xfs_bmbt_irec_t *prevp, /* previous extent pointer */
xfs_extlen_t extsz, /* align to this extent size */
int rt, /* is this a realtime inode? */
int eof, /* is extent at end-of-file? */
int delay, /* creating delalloc extent? */
int convert, /* overwriting unwritten extent? */
xfs_fileoff_t *offp, /* in/out: aligned offset */
xfs_extlen_t *lenp) /* in/out: aligned length */
{
xfs_fileoff_t orig_off; /* original offset */
xfs_extlen_t orig_alen; /* original length */
xfs_fileoff_t orig_end; /* original off+len */
xfs_fileoff_t nexto; /* next file offset */
xfs_fileoff_t prevo; /* previous file offset */
xfs_fileoff_t align_off; /* temp for offset */
xfs_extlen_t align_alen; /* temp for length */
xfs_extlen_t temp; /* temp for calculations */
if (convert)
return 0;
orig_off = align_off = *offp;
orig_alen = align_alen = *lenp;
orig_end = orig_off + orig_alen;
/*
* If this request overlaps an existing extent, then don't
* attempt to perform any additional alignment.
*/
if (!delay && !eof &&
(orig_off >= gotp->br_startoff) &&
(orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
return 0;
}
/*
* If the file offset is unaligned vs. the extent size
* we need to align it. This will be possible unless
* the file was previously written with a kernel that didn't
* perform this alignment, or if a truncate shot us in the
* foot.
*/
div_u64_rem(orig_off, extsz, &temp);
if (temp) {
align_alen += temp;
align_off -= temp;
}
/* Same adjustment for the end of the requested area. */
temp = (align_alen % extsz);
if (temp)
align_alen += extsz - temp;
/*
* For large extent hint sizes, the aligned extent might be larger than
* MAXEXTLEN. In that case, reduce the size by an extsz so that it pulls
* the length back under MAXEXTLEN. The outer allocation loops handle
* short allocation just fine, so it is safe to do this. We only want to
* do it when we are forced to, though, because it means more allocation
* operations are required.
*/
while (align_alen > MAXEXTLEN)
align_alen -= extsz;
ASSERT(align_alen <= MAXEXTLEN);
/*
* If the previous block overlaps with this proposed allocation
* then move the start forward without adjusting the length.
*/
if (prevp->br_startoff != NULLFILEOFF) {
if (prevp->br_startblock == HOLESTARTBLOCK)
prevo = prevp->br_startoff;
else
prevo = prevp->br_startoff + prevp->br_blockcount;
} else
prevo = 0;
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
/*
* If the next block overlaps with this proposed allocation
* then move the start back without adjusting the length,
* but not before offset 0.
* This may of course make the start overlap previous block,
* and if we hit the offset 0 limit then the next block
* can still overlap too.
*/
if (!eof && gotp->br_startoff != NULLFILEOFF) {
if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
(!delay && gotp->br_startblock == DELAYSTARTBLOCK))
nexto = gotp->br_startoff + gotp->br_blockcount;
else
nexto = gotp->br_startoff;
} else
nexto = NULLFILEOFF;
if (!eof &&
align_off + align_alen != orig_end &&
align_off + align_alen > nexto)
align_off = nexto > align_alen ? nexto - align_alen : 0;
/*
* If we're now overlapping the next or previous extent that
* means we can't fit an extsz piece in this hole. Just move
* the start forward to the first valid spot and set
* the length so we hit the end.
*/
if (align_off != orig_off && align_off < prevo)
align_off = prevo;
if (align_off + align_alen != orig_end &&
align_off + align_alen > nexto &&
nexto != NULLFILEOFF) {
ASSERT(nexto > prevo);
align_alen = nexto - align_off;
}
/*
* If realtime, and the result isn't a multiple of the realtime
* extent size we need to remove blocks until it is.
*/
if (rt && (temp = (align_alen % mp->m_sb.sb_rextsize))) {
/*
* We're not covering the original request, or
* we won't be able to once we fix the length.
*/
if (orig_off < align_off ||
orig_end > align_off + align_alen ||
align_alen - temp < orig_alen)
return -EINVAL;
/*
* Try to fix it by moving the start up.
*/
if (align_off + temp <= orig_off) {
align_alen -= temp;
align_off += temp;
}
/*
* Try to fix it by moving the end in.
*/
else if (align_off + align_alen - temp >= orig_end)
align_alen -= temp;
/*
* Set the start to the minimum then trim the length.
*/
else {
align_alen -= orig_off - align_off;
align_off = orig_off;
align_alen -= align_alen % mp->m_sb.sb_rextsize;
}
/*
* Result doesn't cover the request, fail it.
*/
if (orig_off < align_off || orig_end > align_off + align_alen)
return -EINVAL;
} else {
ASSERT(orig_off >= align_off);
/* see MAXEXTLEN handling above */
ASSERT(orig_end <= align_off + align_alen ||
align_alen + extsz > MAXEXTLEN);
}
#ifdef DEBUG
if (!eof && gotp->br_startoff != NULLFILEOFF)
ASSERT(align_off + align_alen <= gotp->br_startoff);
if (prevp->br_startoff != NULLFILEOFF)
ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
#endif
*lenp = align_alen;
*offp = align_off;
return 0;
}
#define XFS_ALLOC_GAP_UNITS 4
void
xfs_bmap_adjacent(
struct xfs_bmalloca *ap) /* bmap alloc argument struct */
{
xfs_fsblock_t adjust; /* adjustment to block numbers */
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
xfs_mount_t *mp; /* mount point structure */
int nullfb; /* true if ap->firstblock isn't set */
int rt; /* true if inode is realtime */
#define ISVALID(x,y) \
(rt ? \
(x) < mp->m_sb.sb_rblocks : \
XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
mp = ap->ip->i_mount;
nullfb = ap->tp->t_firstblock == NULLFSBLOCK;
rt = XFS_IS_REALTIME_INODE(ap->ip) &&
(ap->datatype & XFS_ALLOC_USERDATA);
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp,
ap->tp->t_firstblock);
/*
* If allocating at eof, and there's a previous real block,
* try to use its last block as our starting point.
*/
if (ap->eof && ap->prev.br_startoff != NULLFILEOFF &&
!isnullstartblock(ap->prev.br_startblock) &&
ISVALID(ap->prev.br_startblock + ap->prev.br_blockcount,
ap->prev.br_startblock)) {
ap->blkno = ap->prev.br_startblock + ap->prev.br_blockcount;
/*
* Adjust for the gap between prevp and us.
*/
adjust = ap->offset -
(ap->prev.br_startoff + ap->prev.br_blockcount);
if (adjust &&
ISVALID(ap->blkno + adjust, ap->prev.br_startblock))
ap->blkno += adjust;
}
/*
* If not at eof, then compare the two neighbor blocks.
* Figure out whether either one gives us a good starting point,
* and pick the better one.
*/
else if (!ap->eof) {
xfs_fsblock_t gotbno; /* right side block number */
xfs_fsblock_t gotdiff=0; /* right side difference */
xfs_fsblock_t prevbno; /* left side block number */
xfs_fsblock_t prevdiff=0; /* left side difference */
/*
* If there's a previous (left) block, select a requested
* start block based on it.
*/
if (ap->prev.br_startoff != NULLFILEOFF &&
!isnullstartblock(ap->prev.br_startblock) &&
(prevbno = ap->prev.br_startblock +
ap->prev.br_blockcount) &&
ISVALID(prevbno, ap->prev.br_startblock)) {
/*
* Calculate gap to end of previous block.
*/
adjust = prevdiff = ap->offset -
(ap->prev.br_startoff +
ap->prev.br_blockcount);
/*
* Figure the startblock based on the previous block's
* end and the gap size.
* Heuristic!
* If the gap is large relative to the piece we're
* allocating, or using it gives us an invalid block
* number, then just use the end of the previous block.
*/
if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
ISVALID(prevbno + prevdiff,
ap->prev.br_startblock))
prevbno += adjust;
else
prevdiff += adjust;
/*
* If the firstblock forbids it, can't use it,
* must use default.
*/
if (!rt && !nullfb &&
XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
prevbno = NULLFSBLOCK;
}
/*
* No previous block or can't follow it, just default.
*/
else
prevbno = NULLFSBLOCK;
/*
* If there's a following (right) block, select a requested
* start block based on it.
*/
if (!isnullstartblock(ap->got.br_startblock)) {
/*
* Calculate gap to start of next block.
*/
adjust = gotdiff = ap->got.br_startoff - ap->offset;
/*
* Figure the startblock based on the next block's
* start and the gap size.
*/
gotbno = ap->got.br_startblock;
/*
* Heuristic!
* If the gap is large relative to the piece we're
* allocating, or using it gives us an invalid block
* number, then just use the start of the next block
* offset by our length.
*/
if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->length &&
ISVALID(gotbno - gotdiff, gotbno))
gotbno -= adjust;
else if (ISVALID(gotbno - ap->length, gotbno)) {
gotbno -= ap->length;
gotdiff += adjust - ap->length;
} else
gotdiff += adjust;
/*
* If the firstblock forbids it, can't use it,
* must use default.
*/
if (!rt && !nullfb &&
XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
gotbno = NULLFSBLOCK;
}
/*
* No next block, just default.
*/
else
gotbno = NULLFSBLOCK;
/*
* If both valid, pick the better one, else the only good
* one, else ap->blkno is already set (to 0 or the inode block).
*/
if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
ap->blkno = prevdiff <= gotdiff ? prevbno : gotbno;
else if (prevbno != NULLFSBLOCK)
ap->blkno = prevbno;
else if (gotbno != NULLFSBLOCK)
ap->blkno = gotbno;
}
#undef ISVALID
}
static int
xfs_bmap_longest_free_extent(
struct xfs_trans *tp,
xfs_agnumber_t ag,
xfs_extlen_t *blen,
int *notinit)
{
struct xfs_mount *mp = tp->t_mountp;
struct xfs_perag *pag;
xfs_extlen_t longest;
int error = 0;
pag = xfs_perag_get(mp, ag);
if (!pag->pagf_init) {
error = xfs_alloc_pagf_init(mp, tp, ag, XFS_ALLOC_FLAG_TRYLOCK);
if (error) {
/* Couldn't lock the AGF, so skip this AG. */
if (error == -EAGAIN) {
*notinit = 1;
error = 0;
}
goto out;
}
}
longest = xfs_alloc_longest_free_extent(pag,
xfs_alloc_min_freelist(mp, pag),
xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
if (*blen < longest)
*blen = longest;
out:
xfs_perag_put(pag);
return error;
}
static void
xfs_bmap_select_minlen(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args,
xfs_extlen_t *blen,
int notinit)
{
if (notinit || *blen < ap->minlen) {
/*
* Since we did a BUF_TRYLOCK above, it is possible that
* there is space for this request.
*/
args->minlen = ap->minlen;
} else if (*blen < args->maxlen) {
/*
* If the best seen length is less than the request length,
* use the best as the minimum.
*/
args->minlen = *blen;
} else {
/*
* Otherwise we've seen an extent as big as maxlen, use that
* as the minimum.
*/
args->minlen = args->maxlen;
}
}
STATIC int
xfs_bmap_btalloc_nullfb(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args,
xfs_extlen_t *blen)
{
struct xfs_mount *mp = ap->ip->i_mount;
xfs_agnumber_t ag, startag;
int notinit = 0;
int error;
args->type = XFS_ALLOCTYPE_START_BNO;
args->total = ap->total;
startag = ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
if (startag == NULLAGNUMBER)
startag = ag = 0;
while (*blen < args->maxlen) {
error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
&notinit);
if (error)
return error;
if (++ag == mp->m_sb.sb_agcount)
ag = 0;
if (ag == startag)
break;
}
xfs_bmap_select_minlen(ap, args, blen, notinit);
return 0;
}
STATIC int
xfs_bmap_btalloc_filestreams(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args,
xfs_extlen_t *blen)
{
struct xfs_mount *mp = ap->ip->i_mount;
xfs_agnumber_t ag;
int notinit = 0;
int error;
args->type = XFS_ALLOCTYPE_NEAR_BNO;
args->total = ap->total;
ag = XFS_FSB_TO_AGNO(mp, args->fsbno);
if (ag == NULLAGNUMBER)
ag = 0;
error = xfs_bmap_longest_free_extent(args->tp, ag, blen, &notinit);
if (error)
return error;
if (*blen < args->maxlen) {
error = xfs_filestream_new_ag(ap, &ag);
if (error)
return error;
error = xfs_bmap_longest_free_extent(args->tp, ag, blen,
&notinit);
if (error)
return error;
}
xfs_bmap_select_minlen(ap, args, blen, notinit);
/*
* Set the failure fallback case to look in the selected AG as stream
* may have moved.
*/
ap->blkno = args->fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
return 0;
}
/* Update all inode and quota accounting for the allocation we just did. */
static void
xfs_bmap_btalloc_accounting(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args)
{
if (ap->flags & XFS_BMAPI_COWFORK) {
/*
* COW fork blocks are in-core only and thus are treated as
* in-core quota reservation (like delalloc blocks) even when
* converted to real blocks. The quota reservation is not
* accounted to disk until blocks are remapped to the data
* fork. So if these blocks were previously delalloc, we
* already have quota reservation and there's nothing to do
* yet.
*/
if (ap->wasdel) {
xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
return;
}
/*
* Otherwise, we've allocated blocks in a hole. The transaction
* has acquired in-core quota reservation for this extent.
* Rather than account these as real blocks, however, we reduce
* the transaction quota reservation based on the allocation.
* This essentially transfers the transaction quota reservation
* to that of a delalloc extent.
*/
ap->ip->i_delayed_blks += args->len;
xfs_trans_mod_dquot_byino(ap->tp, ap->ip, XFS_TRANS_DQ_RES_BLKS,
-(long)args->len);
return;
}
/* data/attr fork only */
ap->ip->i_nblocks += args->len;
xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
if (ap->wasdel) {
ap->ip->i_delayed_blks -= args->len;
xfs_mod_delalloc(ap->ip->i_mount, -(int64_t)args->len);
}
xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT : XFS_TRANS_DQ_BCOUNT,
args->len);
}
static int
xfs_bmap_compute_alignments(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args)
{
struct xfs_mount *mp = args->mp;
xfs_extlen_t align = 0; /* minimum allocation alignment */
int stripe_align = 0;
/* stripe alignment for allocation is determined by mount parameters */
if (mp->m_swidth && xfs_has_swalloc(mp))
stripe_align = mp->m_swidth;
else if (mp->m_dalign)
stripe_align = mp->m_dalign;
if (ap->flags & XFS_BMAPI_COWFORK)
align = xfs_get_cowextsz_hint(ap->ip);
else if (ap->datatype & XFS_ALLOC_USERDATA)
align = xfs_get_extsz_hint(ap->ip);
if (align) {
if (xfs_bmap_extsize_align(mp, &ap->got, &ap->prev, align, 0,
ap->eof, 0, ap->conv, &ap->offset,
&ap->length))
ASSERT(0);
ASSERT(ap->length);
}
/* apply extent size hints if obtained earlier */
if (align) {
args->prod = align;
div_u64_rem(ap->offset, args->prod, &args->mod);
if (args->mod)
args->mod = args->prod - args->mod;
} else if (mp->m_sb.sb_blocksize >= PAGE_SIZE) {
args->prod = 1;
args->mod = 0;
} else {
args->prod = PAGE_SIZE >> mp->m_sb.sb_blocklog;
div_u64_rem(ap->offset, args->prod, &args->mod);
if (args->mod)
args->mod = args->prod - args->mod;
}
return stripe_align;
}
static void
xfs_bmap_process_allocated_extent(
struct xfs_bmalloca *ap,
struct xfs_alloc_arg *args,
xfs_fileoff_t orig_offset,
xfs_extlen_t orig_length)
{
int nullfb;
nullfb = ap->tp->t_firstblock == NULLFSBLOCK;
/*
* check the allocation happened at the same or higher AG than
* the first block that was allocated.
*/
ASSERT(nullfb ||
XFS_FSB_TO_AGNO(args->mp, ap->tp->t_firstblock) <=
XFS_FSB_TO_AGNO(args->mp, args->fsbno));
ap->blkno = args->fsbno;
if (nullfb)
ap->tp->t_firstblock = args->fsbno;
ap->length = args->len;
/*
* If the extent size hint is active, we tried to round the
* caller's allocation request offset down to extsz and the
* length up to another extsz boundary. If we found a free
* extent we mapped it in starting at this new offset. If the
* newly mapped space isn't long enough to cover any of the
* range of offsets that was originally requested, move the
* mapping up so that we can fill as much of the caller's
* original request as possible. Free space is apparently
* very fragmented so we're unlikely to be able to satisfy the
* hints anyway.
*/
if (ap->length <= orig_length)
ap->offset = orig_offset;
else if (ap->offset + ap->length < orig_offset + orig_length)
ap->offset = orig_offset + orig_length - ap->length;
xfs_bmap_btalloc_accounting(ap, args);
}
#ifdef DEBUG
static int
xfs_bmap_exact_minlen_extent_alloc(
struct xfs_bmalloca *ap)
{
struct xfs_mount *mp = ap->ip->i_mount;
struct xfs_alloc_arg args = { .tp = ap->tp, .mp = mp };
xfs_fileoff_t orig_offset;
xfs_extlen_t orig_length;
int error;
ASSERT(ap->length);
if (ap->minlen != 1) {
ap->blkno = NULLFSBLOCK;
ap->length = 0;
return 0;
}
orig_offset = ap->offset;
orig_length = ap->length;
args.alloc_minlen_only = 1;
xfs_bmap_compute_alignments(ap, &args);
if (ap->tp->t_firstblock == NULLFSBLOCK) {
/*
* Unlike the longest extent available in an AG, we don't track
* the length of an AG's shortest extent.
* XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT is a debug only knob and
* hence we can afford to start traversing from the 0th AG since
* we need not be concerned about a drop in performance in
* "debug only" code paths.
*/
ap->blkno = XFS_AGB_TO_FSB(mp, 0, 0);
} else {
ap->blkno = ap->tp->t_firstblock;
}
args.fsbno = ap->blkno;
args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE;
args.type = XFS_ALLOCTYPE_FIRST_AG;
args.minlen = args.maxlen = ap->minlen;
args.total = ap->total;
args.alignment = 1;
args.minalignslop = 0;
args.minleft = ap->minleft;
args.wasdel = ap->wasdel;
args.resv = XFS_AG_RESV_NONE;
args.datatype = ap->datatype;
error = xfs_alloc_vextent(&args);
if (error)
return error;
if (args.fsbno != NULLFSBLOCK) {
xfs_bmap_process_allocated_extent(ap, &args, orig_offset,
orig_length);
} else {
ap->blkno = NULLFSBLOCK;
ap->length = 0;
}
return 0;
}
#else
#define xfs_bmap_exact_minlen_extent_alloc(bma) (-EFSCORRUPTED)
#endif
STATIC int
xfs_bmap_btalloc(
struct xfs_bmalloca *ap)
{
struct xfs_mount *mp = ap->ip->i_mount;
struct xfs_alloc_arg args = { .tp = ap->tp, .mp = mp };
xfs_alloctype_t atype = 0;
xfs_agnumber_t fb_agno; /* ag number of ap->firstblock */
xfs_agnumber_t ag;
xfs_fileoff_t orig_offset;
xfs_extlen_t orig_length;
xfs_extlen_t blen;
xfs_extlen_t nextminlen = 0;
int nullfb; /* true if ap->firstblock isn't set */
int isaligned;
int tryagain;
int error;
int stripe_align;
ASSERT(ap->length);
orig_offset = ap->offset;
orig_length = ap->length;
stripe_align = xfs_bmap_compute_alignments(ap, &args);
nullfb = ap->tp->t_firstblock == NULLFSBLOCK;
fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp,
ap->tp->t_firstblock);
if (nullfb) {
if ((ap->datatype & XFS_ALLOC_USERDATA) &&
xfs_inode_is_filestream(ap->ip)) {
ag = xfs_filestream_lookup_ag(ap->ip);
ag = (ag != NULLAGNUMBER) ? ag : 0;
ap->blkno = XFS_AGB_TO_FSB(mp, ag, 0);
} else {
ap->blkno = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
}
} else
ap->blkno = ap->tp->t_firstblock;
xfs_bmap_adjacent(ap);
/*
* If allowed, use ap->blkno; otherwise must use firstblock since
* it's in the right allocation group.
*/
if (nullfb || XFS_FSB_TO_AGNO(mp, ap->blkno) == fb_agno)
;
else
ap->blkno = ap->tp->t_firstblock;
/*
* Normal allocation, done through xfs_alloc_vextent.
*/
tryagain = isaligned = 0;
args.fsbno = ap->blkno;
args.oinfo = XFS_RMAP_OINFO_SKIP_UPDATE;
/* Trim the allocation back to the maximum an AG can fit. */
args.maxlen = min(ap->length, mp->m_ag_max_usable);
blen = 0;
if (nullfb) {
/*
* Search for an allocation group with a single extent large
* enough for the request. If one isn't found, then adjust
* the minimum allocation size to the largest space found.
*/
if ((ap->datatype & XFS_ALLOC_USERDATA) &&
xfs_inode_is_filestream(ap->ip))
error = xfs_bmap_btalloc_filestreams(ap, &args, &blen);
else
error = xfs_bmap_btalloc_nullfb(ap, &args, &blen);
if (error)
return error;
} else if (ap->tp->t_flags & XFS_TRANS_LOWMODE) {
if (xfs_inode_is_filestream(ap->ip))
args.type = XFS_ALLOCTYPE_FIRST_AG;
else
args.type = XFS_ALLOCTYPE_START_BNO;
args.total = args.minlen = ap->minlen;
} else {
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.total = ap->total;
args.minlen = ap->minlen;
}
/*
* If we are not low on available data blocks, and the underlying
* logical volume manager is a stripe, and the file offset is zero then
* try to allocate data blocks on stripe unit boundary. NOTE: ap->aeof
* is only set if the allocation length is >= the stripe unit and the
* allocation offset is at the end of file.
*/
if (!(ap->tp->t_flags & XFS_TRANS_LOWMODE) && ap->aeof) {
if (!ap->offset) {
args.alignment = stripe_align;
atype = args.type;
isaligned = 1;
/*
* Adjust minlen to try and preserve alignment if we
* can't guarantee an aligned maxlen extent.
*/
if (blen > args.alignment &&
blen <= args.maxlen + args.alignment)
args.minlen = blen - args.alignment;
args.minalignslop = 0;
} else {
/*
* First try an exact bno allocation.
* If it fails then do a near or start bno
* allocation with alignment turned on.
*/
atype = args.type;
tryagain = 1;
args.type = XFS_ALLOCTYPE_THIS_BNO;
args.alignment = 1;
/*
* Compute the minlen+alignment for the
* next case. Set slop so that the value
* of minlen+alignment+slop doesn't go up
* between the calls.
*/
if (blen > stripe_align && blen <= args.maxlen)
nextminlen = blen - stripe_align;
else
nextminlen = args.minlen;
if (nextminlen + stripe_align > args.minlen + 1)
args.minalignslop =
nextminlen + stripe_align -
args.minlen - 1;
else
args.minalignslop = 0;
}
} else {
args.alignment = 1;
args.minalignslop = 0;
}
args.minleft = ap->minleft;
args.wasdel = ap->wasdel;
args.resv = XFS_AG_RESV_NONE;
args.datatype = ap->datatype;
error = xfs_alloc_vextent(&args);
if (error)
return error;
if (tryagain && args.fsbno == NULLFSBLOCK) {
/*
* Exact allocation failed. Now try with alignment
* turned on.
*/
args.type = atype;
args.fsbno = ap->blkno;
args.alignment = stripe_align;
args.minlen = nextminlen;
args.minalignslop = 0;
isaligned = 1;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (isaligned && args.fsbno == NULLFSBLOCK) {
/*
* allocation failed, so turn off alignment and
* try again.
*/
args.type = atype;
args.fsbno = ap->blkno;
args.alignment = 0;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (args.fsbno == NULLFSBLOCK && nullfb &&
args.minlen > ap->minlen) {
args.minlen = ap->minlen;
args.type = XFS_ALLOCTYPE_START_BNO;
args.fsbno = ap->blkno;
if ((error = xfs_alloc_vextent(&args)))
return error;
}
if (args.fsbno == NULLFSBLOCK && nullfb) {
args.fsbno = 0;
args.type = XFS_ALLOCTYPE_FIRST_AG;
args.total = ap->minlen;
if ((error = xfs_alloc_vextent(&args)))
return error;
ap->tp->t_flags |= XFS_TRANS_LOWMODE;
}
if (args.fsbno != NULLFSBLOCK) {
xfs_bmap_process_allocated_extent(ap, &args, orig_offset,
orig_length);
} else {
ap->blkno = NULLFSBLOCK;
ap->length = 0;
}
return 0;
}
/* Trim extent to fit a logical block range. */
void
xfs_trim_extent(
struct xfs_bmbt_irec *irec,
xfs_fileoff_t bno,
xfs_filblks_t len)
{
xfs_fileoff_t distance;
xfs_fileoff_t end = bno + len;
if (irec->br_startoff + irec->br_blockcount <= bno ||
irec->br_startoff >= end) {
irec->br_blockcount = 0;
return;
}
if (irec->br_startoff < bno) {
distance = bno - irec->br_startoff;
if (isnullstartblock(irec->br_startblock))
irec->br_startblock = DELAYSTARTBLOCK;
if (irec->br_startblock != DELAYSTARTBLOCK &&
irec->br_startblock != HOLESTARTBLOCK)
irec->br_startblock += distance;
irec->br_startoff += distance;
irec->br_blockcount -= distance;
}
if (end < irec->br_startoff + irec->br_blockcount) {
distance = irec->br_startoff + irec->br_blockcount - end;
irec->br_blockcount -= distance;
}
}
/*
* Trim the returned map to the required bounds
*/
STATIC void
xfs_bmapi_trim_map(
struct xfs_bmbt_irec *mval,
struct xfs_bmbt_irec *got,
xfs_fileoff_t *bno,
xfs_filblks_t len,
xfs_fileoff_t obno,
xfs_fileoff_t end,
int n,
int flags)
{
if ((flags & XFS_BMAPI_ENTIRE) ||
got->br_startoff + got->br_blockcount <= obno) {
*mval = *got;
if (isnullstartblock(got->br_startblock))
mval->br_startblock = DELAYSTARTBLOCK;
return;
}
if (obno > *bno)
*bno = obno;
ASSERT((*bno >= obno) || (n == 0));
ASSERT(*bno < end);
mval->br_startoff = *bno;
if (isnullstartblock(got->br_startblock))
mval->br_startblock = DELAYSTARTBLOCK;
else
mval->br_startblock = got->br_startblock +
(*bno - got->br_startoff);
/*
* Return the minimum of what we got and what we asked for for
* the length. We can use the len variable here because it is
* modified below and we could have been there before coming
* here if the first part of the allocation didn't overlap what
* was asked for.
*/
mval->br_blockcount = XFS_FILBLKS_MIN(end - *bno,
got->br_blockcount - (*bno - got->br_startoff));
mval->br_state = got->br_state;
ASSERT(mval->br_blockcount <= len);
return;
}
/*
* Update and validate the extent map to return
*/
STATIC void
xfs_bmapi_update_map(
struct xfs_bmbt_irec **map,
xfs_fileoff_t *bno,
xfs_filblks_t *len,
xfs_fileoff_t obno,
xfs_fileoff_t end,
int *n,
int flags)
{
xfs_bmbt_irec_t *mval = *map;
ASSERT((flags & XFS_BMAPI_ENTIRE) ||
((mval->br_startoff + mval->br_blockcount) <= end));
ASSERT((flags & XFS_BMAPI_ENTIRE) || (mval->br_blockcount <= *len) ||
(mval->br_startoff < obno));
*bno = mval->br_startoff + mval->br_blockcount;
*len = end - *bno;
if (*n > 0 && mval->br_startoff == mval[-1].br_startoff) {
/* update previous map with new information */
ASSERT(mval->br_startblock == mval[-1].br_startblock);
ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
ASSERT(mval->br_state == mval[-1].br_state);
mval[-1].br_blockcount = mval->br_blockcount;
mval[-1].br_state = mval->br_state;
} else if (*n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
mval[-1].br_startblock != DELAYSTARTBLOCK &&
mval[-1].br_startblock != HOLESTARTBLOCK &&
mval->br_startblock == mval[-1].br_startblock +
mval[-1].br_blockcount &&
mval[-1].br_state == mval->br_state) {
ASSERT(mval->br_startoff ==
mval[-1].br_startoff + mval[-1].br_blockcount);
mval[-1].br_blockcount += mval->br_blockcount;
} else if (*n > 0 &&
mval->br_startblock == DELAYSTARTBLOCK &&
mval[-1].br_startblock == DELAYSTARTBLOCK &&
mval->br_startoff ==
mval[-1].br_startoff + mval[-1].br_blockcount) {
mval[-1].br_blockcount += mval->br_blockcount;
mval[-1].br_state = mval->br_state;
} else if (!((*n == 0) &&
((mval->br_startoff + mval->br_blockcount) <=
obno))) {
mval++;
(*n)++;
}
*map = mval;
}
/*
* Map file blocks to filesystem blocks without allocation.
*/
int
xfs_bmapi_read(
struct xfs_inode *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
struct xfs_bmbt_irec *mval,
int *nmap,
int flags)
{
struct xfs_mount *mp = ip->i_mount;
int whichfork = xfs_bmapi_whichfork(flags);
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec got;
xfs_fileoff_t obno;
xfs_fileoff_t end;
struct xfs_iext_cursor icur;
int error;
bool eof = false;
int n = 0;
ASSERT(*nmap >= 1);
ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_ENTIRE)));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED|XFS_ILOCK_EXCL));
if (WARN_ON_ONCE(!ifp))
return -EFSCORRUPTED;
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT))
return -EFSCORRUPTED;
if (xfs_is_shutdown(mp))
return -EIO;
XFS_STATS_INC(mp, xs_blk_mapr);
error = xfs_iread_extents(NULL, ip, whichfork);
if (error)
return error;
if (!xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got))
eof = true;
end = bno + len;
obno = bno;
while (bno < end && n < *nmap) {
/* Reading past eof, act as though there's a hole up to end. */
if (eof)
got.br_startoff = end;
if (got.br_startoff > bno) {
/* Reading in a hole. */
mval->br_startoff = bno;
mval->br_startblock = HOLESTARTBLOCK;
mval->br_blockcount =
XFS_FILBLKS_MIN(len, got.br_startoff - bno);
mval->br_state = XFS_EXT_NORM;
bno += mval->br_blockcount;
len -= mval->br_blockcount;
mval++;
n++;
continue;
}
/* set up the extent map to return. */
xfs_bmapi_trim_map(mval, &got, &bno, len, obno, end, n, flags);
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
/* If we're done, stop now. */
if (bno >= end || n >= *nmap)
break;
/* Else go on to the next record. */
if (!xfs_iext_next_extent(ifp, &icur, &got))
eof = true;
}
*nmap = n;
return 0;
}
/*
* Add a delayed allocation extent to an inode. Blocks are reserved from the
* global pool and the extent inserted into the inode in-core extent tree.
*
* On entry, got refers to the first extent beyond the offset of the extent to
* allocate or eof is specified if no such extent exists. On return, got refers
* to the extent record that was inserted to the inode fork.
*
* Note that the allocated extent may have been merged with contiguous extents
* during insertion into the inode fork. Thus, got does not reflect the current
* state of the inode fork on return. If necessary, the caller can use lastx to
* look up the updated record in the inode fork.
*/
int
xfs_bmapi_reserve_delalloc(
struct xfs_inode *ip,
int whichfork,
xfs_fileoff_t off,
xfs_filblks_t len,
xfs_filblks_t prealloc,
struct xfs_bmbt_irec *got,
struct xfs_iext_cursor *icur,
int eof)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_extlen_t alen;
xfs_extlen_t indlen;
int error;
xfs_fileoff_t aoff = off;
/*
* Cap the alloc length. Keep track of prealloc so we know whether to
* tag the inode before we return.
*/
alen = XFS_FILBLKS_MIN(len + prealloc, MAXEXTLEN);
if (!eof)
alen = XFS_FILBLKS_MIN(alen, got->br_startoff - aoff);
if (prealloc && alen >= len)
prealloc = alen - len;
/* Figure out the extent size, adjust alen */
if (whichfork == XFS_COW_FORK) {
struct xfs_bmbt_irec prev;
xfs_extlen_t extsz = xfs_get_cowextsz_hint(ip);
if (!xfs_iext_peek_prev_extent(ifp, icur, &prev))
prev.br_startoff = NULLFILEOFF;
error = xfs_bmap_extsize_align(mp, got, &prev, extsz, 0, eof,
1, 0, &aoff, &alen);
ASSERT(!error);
}
/*
* Make a transaction-less quota reservation for delayed allocation
* blocks. This number gets adjusted later. We return if we haven't
* allocated blocks already inside this loop.
*/
error = xfs_quota_reserve_blkres(ip, alen);
if (error)
return error;
/*
* Split changing sb for alen and indlen since they could be coming
* from different places.
*/
indlen = (xfs_extlen_t)xfs_bmap_worst_indlen(ip, alen);
ASSERT(indlen > 0);
error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
if (error)
goto out_unreserve_quota;
error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
if (error)
goto out_unreserve_blocks;
ip->i_delayed_blks += alen;
xfs_mod_delalloc(ip->i_mount, alen + indlen);
got->br_startoff = aoff;
got->br_startblock = nullstartblock(indlen);
got->br_blockcount = alen;
got->br_state = XFS_EXT_NORM;
xfs_bmap_add_extent_hole_delay(ip, whichfork, icur, got);
/*
* Tag the inode if blocks were preallocated. Note that COW fork
* preallocation can occur at the start or end of the extent, even when
* prealloc == 0, so we must also check the aligned offset and length.
*/
if (whichfork == XFS_DATA_FORK && prealloc)
xfs_inode_set_eofblocks_tag(ip);
if (whichfork == XFS_COW_FORK && (prealloc || aoff < off || alen > len))
xfs_inode_set_cowblocks_tag(ip);
return 0;
out_unreserve_blocks:
xfs_mod_fdblocks(mp, alen, false);
out_unreserve_quota:
if (XFS_IS_QUOTA_ON(mp))
xfs_quota_unreserve_blkres(ip, alen);
return error;
}
static int
xfs_bmap_alloc_userdata(
struct xfs_bmalloca *bma)
{
struct xfs_mount *mp = bma->ip->i_mount;
int whichfork = xfs_bmapi_whichfork(bma->flags);
int error;
/*
* Set the data type being allocated. For the data fork, the first data
* in the file is treated differently to all other allocations. For the
* attribute fork, we only need to ensure the allocated range is not on
* the busy list.
*/
bma->datatype = XFS_ALLOC_NOBUSY;
if (whichfork == XFS_DATA_FORK) {
bma->datatype |= XFS_ALLOC_USERDATA;
if (bma->offset == 0)
bma->datatype |= XFS_ALLOC_INITIAL_USER_DATA;
if (mp->m_dalign && bma->length >= mp->m_dalign) {
error = xfs_bmap_isaeof(bma, whichfork);
if (error)
return error;
}
if (XFS_IS_REALTIME_INODE(bma->ip))
return xfs_bmap_rtalloc(bma);
}
if (unlikely(XFS_TEST_ERROR(false, mp,
XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT)))
return xfs_bmap_exact_minlen_extent_alloc(bma);
return xfs_bmap_btalloc(bma);
}
static int
xfs_bmapi_allocate(
struct xfs_bmalloca *bma)
{
struct xfs_mount *mp = bma->ip->i_mount;
int whichfork = xfs_bmapi_whichfork(bma->flags);
struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
int tmp_logflags = 0;
int error;
ASSERT(bma->length > 0);
/*
* For the wasdelay case, we could also just allocate the stuff asked
* for in this bmap call but that wouldn't be as good.
*/
if (bma->wasdel) {
bma->length = (xfs_extlen_t)bma->got.br_blockcount;
bma->offset = bma->got.br_startoff;
if (!xfs_iext_peek_prev_extent(ifp, &bma->icur, &bma->prev))
bma->prev.br_startoff = NULLFILEOFF;
} else {
bma->length = XFS_FILBLKS_MIN(bma->length, MAXEXTLEN);
if (!bma->eof)
bma->length = XFS_FILBLKS_MIN(bma->length,
bma->got.br_startoff - bma->offset);
}
if (bma->flags & XFS_BMAPI_CONTIG)
bma->minlen = bma->length;
else
bma->minlen = 1;
if (bma->flags & XFS_BMAPI_METADATA) {
if (unlikely(XFS_TEST_ERROR(false, mp,
XFS_ERRTAG_BMAP_ALLOC_MINLEN_EXTENT)))
error = xfs_bmap_exact_minlen_extent_alloc(bma);
else
error = xfs_bmap_btalloc(bma);
} else {
error = xfs_bmap_alloc_userdata(bma);
}
if (error || bma->blkno == NULLFSBLOCK)
return error;
if (bma->flags & XFS_BMAPI_ZERO) {
error = xfs_zero_extent(bma->ip, bma->blkno, bma->length);
if (error)
return error;
}
if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur)
bma->cur = xfs_bmbt_init_cursor(mp, bma->tp, bma->ip, whichfork);
/*
* Bump the number of extents we've allocated
* in this call.
*/
bma->nallocs++;
if (bma->cur)
bma->cur->bc_ino.flags =
bma->wasdel ? XFS_BTCUR_BMBT_WASDEL : 0;
bma->got.br_startoff = bma->offset;
bma->got.br_startblock = bma->blkno;
bma->got.br_blockcount = bma->length;
bma->got.br_state = XFS_EXT_NORM;
if (bma->flags & XFS_BMAPI_PREALLOC)
bma->got.br_state = XFS_EXT_UNWRITTEN;
if (bma->wasdel)
error = xfs_bmap_add_extent_delay_real(bma, whichfork);
else
error = xfs_bmap_add_extent_hole_real(bma->tp, bma->ip,
whichfork, &bma->icur, &bma->cur, &bma->got,
&bma->logflags, bma->flags);
bma->logflags |= tmp_logflags;
if (error)
return error;
/*
* Update our extent pointer, given that xfs_bmap_add_extent_delay_real
* or xfs_bmap_add_extent_hole_real might have merged it into one of
* the neighbouring ones.
*/
xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
ASSERT(bma->got.br_startoff <= bma->offset);
ASSERT(bma->got.br_startoff + bma->got.br_blockcount >=
bma->offset + bma->length);
ASSERT(bma->got.br_state == XFS_EXT_NORM ||
bma->got.br_state == XFS_EXT_UNWRITTEN);
return 0;
}
STATIC int
xfs_bmapi_convert_unwritten(
struct xfs_bmalloca *bma,
struct xfs_bmbt_irec *mval,
xfs_filblks_t len,
int flags)
{
int whichfork = xfs_bmapi_whichfork(flags);
struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
int tmp_logflags = 0;
int error;
/* check if we need to do unwritten->real conversion */
if (mval->br_state == XFS_EXT_UNWRITTEN &&
(flags & XFS_BMAPI_PREALLOC))
return 0;
/* check if we need to do real->unwritten conversion */
if (mval->br_state == XFS_EXT_NORM &&
(flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT)) !=
(XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT))
return 0;
/*
* Modify (by adding) the state flag, if writing.
*/
ASSERT(mval->br_blockcount <= len);
if (ifp->if_format == XFS_DINODE_FMT_BTREE && !bma->cur) {
bma->cur = xfs_bmbt_init_cursor(bma->ip->i_mount, bma->tp,
bma->ip, whichfork);
}
mval->br_state = (mval->br_state == XFS_EXT_UNWRITTEN)
? XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
/*
* Before insertion into the bmbt, zero the range being converted
* if required.
*/
if (flags & XFS_BMAPI_ZERO) {
error = xfs_zero_extent(bma->ip, mval->br_startblock,
mval->br_blockcount);
if (error)
return error;
}
error = xfs_bmap_add_extent_unwritten_real(bma->tp, bma->ip, whichfork,
&bma->icur, &bma->cur, mval, &tmp_logflags);
/*
* Log the inode core unconditionally in the unwritten extent conversion
* path because the conversion might not have done so (e.g., if the
* extent count hasn't changed). We need to make sure the inode is dirty
* in the transaction for the sake of fsync(), even if nothing has
* changed, because fsync() will not force the log for this transaction
* unless it sees the inode pinned.
*
* Note: If we're only converting cow fork extents, there aren't
* any on-disk updates to make, so we don't need to log anything.
*/
if (whichfork != XFS_COW_FORK)
bma->logflags |= tmp_logflags | XFS_ILOG_CORE;
if (error)
return error;
/*
* Update our extent pointer, given that
* xfs_bmap_add_extent_unwritten_real might have merged it into one
* of the neighbouring ones.
*/
xfs_iext_get_extent(ifp, &bma->icur, &bma->got);
/*
* We may have combined previously unwritten space with written space,
* so generate another request.
*/
if (mval->br_blockcount < len)
return -EAGAIN;
return 0;
}
static inline xfs_extlen_t
xfs_bmapi_minleft(
struct xfs_trans *tp,
struct xfs_inode *ip,
int fork)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, fork);
if (tp && tp->t_firstblock != NULLFSBLOCK)
return 0;
if (ifp->if_format != XFS_DINODE_FMT_BTREE)
return 1;
return be16_to_cpu(ifp->if_broot->bb_level) + 1;
}
/*
* Log whatever the flags say, even if error. Otherwise we might miss detecting
* a case where the data is changed, there's an error, and it's not logged so we
* don't shutdown when we should. Don't bother logging extents/btree changes if
* we converted to the other format.
*/
static void
xfs_bmapi_finish(
struct xfs_bmalloca *bma,
int whichfork,
int error)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(bma->ip, whichfork);
if ((bma->logflags & xfs_ilog_fext(whichfork)) &&
ifp->if_format != XFS_DINODE_FMT_EXTENTS)
bma->logflags &= ~xfs_ilog_fext(whichfork);
else if ((bma->logflags & xfs_ilog_fbroot(whichfork)) &&
ifp->if_format != XFS_DINODE_FMT_BTREE)
bma->logflags &= ~xfs_ilog_fbroot(whichfork);
if (bma->logflags)
xfs_trans_log_inode(bma->tp, bma->ip, bma->logflags);
if (bma->cur)
xfs_btree_del_cursor(bma->cur, error);
}
/*
* Map file blocks to filesystem blocks, and allocate blocks or convert the
* extent state if necessary. Details behaviour is controlled by the flags
* parameter. Only allocates blocks from a single allocation group, to avoid
* locking problems.
*/
int
xfs_bmapi_write(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t bno, /* starting file offs. mapped */
xfs_filblks_t len, /* length to map in file */
int flags, /* XFS_BMAPI_... */
xfs_extlen_t total, /* total blocks needed */
struct xfs_bmbt_irec *mval, /* output: map values */
int *nmap) /* i/o: mval size/count */
{
struct xfs_bmalloca bma = {
.tp = tp,
.ip = ip,
.total = total,
};
struct xfs_mount *mp = ip->i_mount;
int whichfork = xfs_bmapi_whichfork(flags);
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
xfs_fileoff_t end; /* end of mapped file region */
bool eof = false; /* after the end of extents */
int error; /* error return */
int n; /* current extent index */
xfs_fileoff_t obno; /* old block number (offset) */
#ifdef DEBUG
xfs_fileoff_t orig_bno; /* original block number value */
int orig_flags; /* original flags arg value */
xfs_filblks_t orig_len; /* original value of len arg */
struct xfs_bmbt_irec *orig_mval; /* original value of mval */
int orig_nmap; /* original value of *nmap */
orig_bno = bno;
orig_len = len;
orig_flags = flags;
orig_mval = mval;
orig_nmap = *nmap;
#endif
ASSERT(*nmap >= 1);
ASSERT(*nmap <= XFS_BMAP_MAX_NMAP);
ASSERT(tp != NULL);
ASSERT(len > 0);
ASSERT(ifp->if_format != XFS_DINODE_FMT_LOCAL);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(!(flags & XFS_BMAPI_REMAP));
/* zeroing is for currently only for data extents, not metadata */
ASSERT((flags & (XFS_BMAPI_METADATA | XFS_BMAPI_ZERO)) !=
(XFS_BMAPI_METADATA | XFS_BMAPI_ZERO));
/*
* we can allocate unwritten extents or pre-zero allocated blocks,
* but it makes no sense to do both at once. This would result in
* zeroing the unwritten extent twice, but it still being an
* unwritten extent....
*/
ASSERT((flags & (XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO)) !=
(XFS_BMAPI_PREALLOC | XFS_BMAPI_ZERO));
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
return -EFSCORRUPTED;
}
if (xfs_is_shutdown(mp))
return -EIO;
XFS_STATS_INC(mp, xs_blk_mapw);
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
goto error0;
if (!xfs_iext_lookup_extent(ip, ifp, bno, &bma.icur, &bma.got))
eof = true;
if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev))
bma.prev.br_startoff = NULLFILEOFF;
bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork);
n = 0;
end = bno + len;
obno = bno;
while (bno < end && n < *nmap) {
bool need_alloc = false, wasdelay = false;
/* in hole or beyond EOF? */
if (eof || bma.got.br_startoff > bno) {
/*
* CoW fork conversions should /never/ hit EOF or
* holes. There should always be something for us
* to work on.
*/
ASSERT(!((flags & XFS_BMAPI_CONVERT) &&
(flags & XFS_BMAPI_COWFORK)));
need_alloc = true;
} else if (isnullstartblock(bma.got.br_startblock)) {
wasdelay = true;
}
/*
* First, deal with the hole before the allocated space
* that we found, if any.
*/
if (need_alloc || wasdelay) {
bma.eof = eof;
bma.conv = !!(flags & XFS_BMAPI_CONVERT);
bma.wasdel = wasdelay;
bma.offset = bno;
bma.flags = flags;
/*
* There's a 32/64 bit type mismatch between the
* allocation length request (which can be 64 bits in
* length) and the bma length request, which is
* xfs_extlen_t and therefore 32 bits. Hence we have to
* check for 32-bit overflows and handle them here.
*/
if (len > (xfs_filblks_t)MAXEXTLEN)
bma.length = MAXEXTLEN;
else
bma.length = len;
ASSERT(len > 0);
ASSERT(bma.length > 0);
error = xfs_bmapi_allocate(&bma);
if (error)
goto error0;
if (bma.blkno == NULLFSBLOCK)
break;
/*
* If this is a CoW allocation, record the data in
* the refcount btree for orphan recovery.
*/
if (whichfork == XFS_COW_FORK)
xfs_refcount_alloc_cow_extent(tp, bma.blkno,
bma.length);
}
/* Deal with the allocated space we found. */
xfs_bmapi_trim_map(mval, &bma.got, &bno, len, obno,
end, n, flags);
/* Execute unwritten extent conversion if necessary */
error = xfs_bmapi_convert_unwritten(&bma, mval, len, flags);
if (error == -EAGAIN)
continue;
if (error)
goto error0;
/* update the extent map to return */
xfs_bmapi_update_map(&mval, &bno, &len, obno, end, &n, flags);
/*
* If we're done, stop now. Stop when we've allocated
* XFS_BMAP_MAX_NMAP extents no matter what. Otherwise
* the transaction may get too big.
*/
if (bno >= end || n >= *nmap || bma.nallocs >= *nmap)
break;
/* Else go on to the next record. */
bma.prev = bma.got;
if (!xfs_iext_next_extent(ifp, &bma.icur, &bma.got))
eof = true;
}
*nmap = n;
error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags,
whichfork);
if (error)
goto error0;
ASSERT(ifp->if_format != XFS_DINODE_FMT_BTREE ||
ifp->if_nextents > XFS_IFORK_MAXEXT(ip, whichfork));
xfs_bmapi_finish(&bma, whichfork, 0);
xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
orig_nmap, *nmap);
return 0;
error0:
xfs_bmapi_finish(&bma, whichfork, error);
return error;
}
/*
* Convert an existing delalloc extent to real blocks based on file offset. This
* attempts to allocate the entire delalloc extent and may require multiple
* invocations to allocate the target offset if a large enough physical extent
* is not available.
*/
int
xfs_bmapi_convert_delalloc(
struct xfs_inode *ip,
int whichfork,
xfs_off_t offset,
struct iomap *iomap,
unsigned int *seq)
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
struct xfs_bmalloca bma = { NULL };
uint16_t flags = 0;
struct xfs_trans *tp;
int error;
if (whichfork == XFS_COW_FORK)
flags |= IOMAP_F_SHARED;
/*
* Space for the extent and indirect blocks was reserved when the
* delalloc extent was created so there's no need to do so here.
*/
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, 0, 0,
XFS_TRANS_RESERVE, &tp);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_iext_count_may_overflow(ip, whichfork,
XFS_IEXT_ADD_NOSPLIT_CNT);
if (error)
goto out_trans_cancel;
xfs_trans_ijoin(tp, ip, 0);
if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &bma.icur, &bma.got) ||
bma.got.br_startoff > offset_fsb) {
/*
* No extent found in the range we are trying to convert. This
* should only happen for the COW fork, where another thread
* might have moved the extent to the data fork in the meantime.
*/
WARN_ON_ONCE(whichfork != XFS_COW_FORK);
error = -EAGAIN;
goto out_trans_cancel;
}
/*
* If we find a real extent here we raced with another thread converting
* the extent. Just return the real extent at this offset.
*/
if (!isnullstartblock(bma.got.br_startblock)) {
xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags);
*seq = READ_ONCE(ifp->if_seq);
goto out_trans_cancel;
}
bma.tp = tp;
bma.ip = ip;
bma.wasdel = true;
bma.offset = bma.got.br_startoff;
bma.length = max_t(xfs_filblks_t, bma.got.br_blockcount, MAXEXTLEN);
bma.minleft = xfs_bmapi_minleft(tp, ip, whichfork);
/*
* When we're converting the delalloc reservations backing dirty pages
* in the page cache, we must be careful about how we create the new
* extents:
*
* New CoW fork extents are created unwritten, turned into real extents
* when we're about to write the data to disk, and mapped into the data
* fork after the write finishes. End of story.
*
* New data fork extents must be mapped in as unwritten and converted
* to real extents after the write succeeds to avoid exposing stale
* disk contents if we crash.
*/
bma.flags = XFS_BMAPI_PREALLOC;
if (whichfork == XFS_COW_FORK)
bma.flags |= XFS_BMAPI_COWFORK;
if (!xfs_iext_peek_prev_extent(ifp, &bma.icur, &bma.prev))
bma.prev.br_startoff = NULLFILEOFF;
error = xfs_bmapi_allocate(&bma);
if (error)
goto out_finish;
error = -ENOSPC;
if (WARN_ON_ONCE(bma.blkno == NULLFSBLOCK))
goto out_finish;
error = -EFSCORRUPTED;
if (WARN_ON_ONCE(!xfs_valid_startblock(ip, bma.got.br_startblock)))
goto out_finish;
XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, bma.length));
XFS_STATS_INC(mp, xs_xstrat_quick);
ASSERT(!isnullstartblock(bma.got.br_startblock));
xfs_bmbt_to_iomap(ip, iomap, &bma.got, 0, flags);
*seq = READ_ONCE(ifp->if_seq);
if (whichfork == XFS_COW_FORK)
xfs_refcount_alloc_cow_extent(tp, bma.blkno, bma.length);
error = xfs_bmap_btree_to_extents(tp, ip, bma.cur, &bma.logflags,
whichfork);
if (error)
goto out_finish;
xfs_bmapi_finish(&bma, whichfork, 0);
error = xfs_trans_commit(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
out_finish:
xfs_bmapi_finish(&bma, whichfork, error);
out_trans_cancel:
xfs_trans_cancel(tp);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
int
xfs_bmapi_remap(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
xfs_fsblock_t startblock,
int flags)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp;
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_irec got;
struct xfs_iext_cursor icur;
int whichfork = xfs_bmapi_whichfork(flags);
int logflags = 0, error;
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(len > 0);
ASSERT(len <= (xfs_filblks_t)MAXEXTLEN);
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(!(flags & ~(XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC |
XFS_BMAPI_NORMAP)));
ASSERT((flags & (XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC)) !=
(XFS_BMAPI_ATTRFORK | XFS_BMAPI_PREALLOC));
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
return -EFSCORRUPTED;
}
if (xfs_is_shutdown(mp))
return -EIO;
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
if (xfs_iext_lookup_extent(ip, ifp, bno, &icur, &got)) {
/* make sure we only reflink into a hole. */
ASSERT(got.br_startoff > bno);
ASSERT(got.br_startoff - bno >= len);
}
ip->i_nblocks += len;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_ino.flags = 0;
}
got.br_startoff = bno;
got.br_startblock = startblock;
got.br_blockcount = len;
if (flags & XFS_BMAPI_PREALLOC)
got.br_state = XFS_EXT_UNWRITTEN;
else
got.br_state = XFS_EXT_NORM;
error = xfs_bmap_add_extent_hole_real(tp, ip, whichfork, &icur,
&cur, &got, &logflags, flags);
if (error)
goto error0;
error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags, whichfork);
error0:
if (ip->i_df.if_format != XFS_DINODE_FMT_EXTENTS)
logflags &= ~XFS_ILOG_DEXT;
else if (ip->i_df.if_format != XFS_DINODE_FMT_BTREE)
logflags &= ~XFS_ILOG_DBROOT;
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (cur)
xfs_btree_del_cursor(cur, error);
return error;
}
/*
* When a delalloc extent is split (e.g., due to a hole punch), the original
* indlen reservation must be shared across the two new extents that are left
* behind.
*
* Given the original reservation and the worst case indlen for the two new
* extents (as calculated by xfs_bmap_worst_indlen()), split the original
* reservation fairly across the two new extents. If necessary, steal available
* blocks from a deleted extent to make up a reservation deficiency (e.g., if
* ores == 1). The number of stolen blocks is returned. The availability and
* subsequent accounting of stolen blocks is the responsibility of the caller.
*/
static xfs_filblks_t
xfs_bmap_split_indlen(
xfs_filblks_t ores, /* original res. */
xfs_filblks_t *indlen1, /* ext1 worst indlen */
xfs_filblks_t *indlen2, /* ext2 worst indlen */
xfs_filblks_t avail) /* stealable blocks */
{
xfs_filblks_t len1 = *indlen1;
xfs_filblks_t len2 = *indlen2;
xfs_filblks_t nres = len1 + len2; /* new total res. */
xfs_filblks_t stolen = 0;
xfs_filblks_t resfactor;
/*
* Steal as many blocks as we can to try and satisfy the worst case
* indlen for both new extents.
*/
if (ores < nres && avail)
stolen = XFS_FILBLKS_MIN(nres - ores, avail);
ores += stolen;
/* nothing else to do if we've satisfied the new reservation */
if (ores >= nres)
return stolen;
/*
* We can't meet the total required reservation for the two extents.
* Calculate the percent of the overall shortage between both extents
* and apply this percentage to each of the requested indlen values.
* This distributes the shortage fairly and reduces the chances that one
* of the two extents is left with nothing when extents are repeatedly
* split.
*/
resfactor = (ores * 100);
do_div(resfactor, nres);
len1 *= resfactor;
do_div(len1, 100);
len2 *= resfactor;
do_div(len2, 100);
ASSERT(len1 + len2 <= ores);
ASSERT(len1 < *indlen1 && len2 < *indlen2);
/*
* Hand out the remainder to each extent. If one of the two reservations
* is zero, we want to make sure that one gets a block first. The loop
* below starts with len1, so hand len2 a block right off the bat if it
* is zero.
*/
ores -= (len1 + len2);
ASSERT((*indlen1 - len1) + (*indlen2 - len2) >= ores);
if (ores && !len2 && *indlen2) {
len2++;
ores--;
}
while (ores) {
if (len1 < *indlen1) {
len1++;
ores--;
}
if (!ores)
break;
if (len2 < *indlen2) {
len2++;
ores--;
}
}
*indlen1 = len1;
*indlen2 = len2;
return stolen;
}
int
xfs_bmap_del_extent_delay(
struct xfs_inode *ip,
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got,
struct xfs_bmbt_irec *del)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec new;
int64_t da_old, da_new, da_diff = 0;
xfs_fileoff_t del_endoff, got_endoff;
xfs_filblks_t got_indlen, new_indlen, stolen;
int state = xfs_bmap_fork_to_state(whichfork);
int error = 0;
bool isrt;
XFS_STATS_INC(mp, xs_del_exlist);
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
del_endoff = del->br_startoff + del->br_blockcount;
got_endoff = got->br_startoff + got->br_blockcount;
da_old = startblockval(got->br_startblock);
da_new = 0;
ASSERT(del->br_blockcount > 0);
ASSERT(got->br_startoff <= del->br_startoff);
ASSERT(got_endoff >= del_endoff);
if (isrt) {
uint64_t rtexts = XFS_FSB_TO_B(mp, del->br_blockcount);
do_div(rtexts, mp->m_sb.sb_rextsize);
xfs_mod_frextents(mp, rtexts);
}
/*
* Update the inode delalloc counter now and wait to update the
* sb counters as we might have to borrow some blocks for the
* indirect block accounting.
*/
ASSERT(!isrt);
error = xfs_quota_unreserve_blkres(ip, del->br_blockcount);
if (error)
return error;
ip->i_delayed_blks -= del->br_blockcount;
if (got->br_startoff == del->br_startoff)
state |= BMAP_LEFT_FILLING;
if (got_endoff == del_endoff)
state |= BMAP_RIGHT_FILLING;
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
break;
case BMAP_LEFT_FILLING:
/*
* Deleting the first part of the extent.
*/
got->br_startoff = del_endoff;
got->br_blockcount -= del->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
got->br_blockcount), da_old);
got->br_startblock = nullstartblock((int)da_new);
xfs_iext_update_extent(ip, state, icur, got);
break;
case BMAP_RIGHT_FILLING:
/*
* Deleting the last part of the extent.
*/
got->br_blockcount = got->br_blockcount - del->br_blockcount;
da_new = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip,
got->br_blockcount), da_old);
got->br_startblock = nullstartblock((int)da_new);
xfs_iext_update_extent(ip, state, icur, got);
break;
case 0:
/*
* Deleting the middle of the extent.
*
* Distribute the original indlen reservation across the two new
* extents. Steal blocks from the deleted extent if necessary.
* Stealing blocks simply fudges the fdblocks accounting below.
* Warn if either of the new indlen reservations is zero as this
* can lead to delalloc problems.
*/
got->br_blockcount = del->br_startoff - got->br_startoff;
got_indlen = xfs_bmap_worst_indlen(ip, got->br_blockcount);
new.br_blockcount = got_endoff - del_endoff;
new_indlen = xfs_bmap_worst_indlen(ip, new.br_blockcount);
WARN_ON_ONCE(!got_indlen || !new_indlen);
stolen = xfs_bmap_split_indlen(da_old, &got_indlen, &new_indlen,
del->br_blockcount);
got->br_startblock = nullstartblock((int)got_indlen);
new.br_startoff = del_endoff;
new.br_state = got->br_state;
new.br_startblock = nullstartblock((int)new_indlen);
xfs_iext_update_extent(ip, state, icur, got);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &new, state);
da_new = got_indlen + new_indlen - stolen;
del->br_blockcount -= stolen;
break;
}
ASSERT(da_old >= da_new);
da_diff = da_old - da_new;
if (!isrt)
da_diff += del->br_blockcount;
if (da_diff) {
xfs_mod_fdblocks(mp, da_diff, false);
xfs_mod_delalloc(mp, -da_diff);
}
return error;
}
void
xfs_bmap_del_extent_cow(
struct xfs_inode *ip,
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got,
struct xfs_bmbt_irec *del)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
struct xfs_bmbt_irec new;
xfs_fileoff_t del_endoff, got_endoff;
int state = BMAP_COWFORK;
XFS_STATS_INC(mp, xs_del_exlist);
del_endoff = del->br_startoff + del->br_blockcount;
got_endoff = got->br_startoff + got->br_blockcount;
ASSERT(del->br_blockcount > 0);
ASSERT(got->br_startoff <= del->br_startoff);
ASSERT(got_endoff >= del_endoff);
ASSERT(!isnullstartblock(got->br_startblock));
if (got->br_startoff == del->br_startoff)
state |= BMAP_LEFT_FILLING;
if (got_endoff == del_endoff)
state |= BMAP_RIGHT_FILLING;
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
break;
case BMAP_LEFT_FILLING:
/*
* Deleting the first part of the extent.
*/
got->br_startoff = del_endoff;
got->br_blockcount -= del->br_blockcount;
got->br_startblock = del->br_startblock + del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, got);
break;
case BMAP_RIGHT_FILLING:
/*
* Deleting the last part of the extent.
*/
got->br_blockcount -= del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, got);
break;
case 0:
/*
* Deleting the middle of the extent.
*/
got->br_blockcount = del->br_startoff - got->br_startoff;
new.br_startoff = del_endoff;
new.br_blockcount = got_endoff - del_endoff;
new.br_state = got->br_state;
new.br_startblock = del->br_startblock + del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, got);
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &new, state);
break;
}
ip->i_delayed_blks -= del->br_blockcount;
}
/*
* Called by xfs_bmapi to update file extent records and the btree
* after removing space.
*/
STATIC int /* error */
xfs_bmap_del_extent_real(
xfs_inode_t *ip, /* incore inode pointer */
xfs_trans_t *tp, /* current transaction pointer */
struct xfs_iext_cursor *icur,
struct xfs_btree_cur *cur, /* if null, not a btree */
xfs_bmbt_irec_t *del, /* data to remove from extents */
int *logflagsp, /* inode logging flags */
int whichfork, /* data or attr fork */
int bflags) /* bmapi flags */
{
xfs_fsblock_t del_endblock=0; /* first block past del */
xfs_fileoff_t del_endoff; /* first offset past del */
int do_fx; /* free extent at end of routine */
int error; /* error return value */
int flags = 0;/* inode logging flags */
struct xfs_bmbt_irec got; /* current extent entry */
xfs_fileoff_t got_endoff; /* first offset past got */
int i; /* temp state */
struct xfs_ifork *ifp; /* inode fork pointer */
xfs_mount_t *mp; /* mount structure */
xfs_filblks_t nblks; /* quota/sb block count */
xfs_bmbt_irec_t new; /* new record to be inserted */
/* REFERENCED */
uint qfield; /* quota field to update */
int state = xfs_bmap_fork_to_state(whichfork);
struct xfs_bmbt_irec old;
mp = ip->i_mount;
XFS_STATS_INC(mp, xs_del_exlist);
ifp = XFS_IFORK_PTR(ip, whichfork);
ASSERT(del->br_blockcount > 0);
xfs_iext_get_extent(ifp, icur, &got);
ASSERT(got.br_startoff <= del->br_startoff);
del_endoff = del->br_startoff + del->br_blockcount;
got_endoff = got.br_startoff + got.br_blockcount;
ASSERT(got_endoff >= del_endoff);
ASSERT(!isnullstartblock(got.br_startblock));
qfield = 0;
error = 0;
/*
* If it's the case where the directory code is running with no block
* reservation, and the deleted block is in the middle of its extent,
* and the resulting insert of an extent would cause transformation to
* btree format, then reject it. The calling code will then swap blocks
* around instead. We have to do this now, rather than waiting for the
* conversion to btree format, since the transaction will be dirty then.
*/
if (tp->t_blk_res == 0 &&
ifp->if_format == XFS_DINODE_FMT_EXTENTS &&
ifp->if_nextents >= XFS_IFORK_MAXEXT(ip, whichfork) &&
del->br_startoff > got.br_startoff && del_endoff < got_endoff)
return -ENOSPC;
flags = XFS_ILOG_CORE;
if (whichfork == XFS_DATA_FORK && XFS_IS_REALTIME_INODE(ip)) {
xfs_filblks_t len;
xfs_extlen_t mod;
len = div_u64_rem(del->br_blockcount, mp->m_sb.sb_rextsize,
&mod);
ASSERT(mod == 0);
if (!(bflags & XFS_BMAPI_REMAP)) {
xfs_fsblock_t bno;
bno = div_u64_rem(del->br_startblock,
mp->m_sb.sb_rextsize, &mod);
ASSERT(mod == 0);
error = xfs_rtfree_extent(tp, bno, (xfs_extlen_t)len);
if (error)
goto done;
}
do_fx = 0;
nblks = len * mp->m_sb.sb_rextsize;
qfield = XFS_TRANS_DQ_RTBCOUNT;
} else {
do_fx = 1;
nblks = del->br_blockcount;
qfield = XFS_TRANS_DQ_BCOUNT;
}
del_endblock = del->br_startblock + del->br_blockcount;
if (cur) {
error = xfs_bmbt_lookup_eq(cur, &got, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
}
if (got.br_startoff == del->br_startoff)
state |= BMAP_LEFT_FILLING;
if (got_endoff == del_endoff)
state |= BMAP_RIGHT_FILLING;
switch (state & (BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING)) {
case BMAP_LEFT_FILLING | BMAP_RIGHT_FILLING:
/*
* Matches the whole extent. Delete the entry.
*/
xfs_iext_remove(ip, icur, state);
xfs_iext_prev(ifp, icur);
ifp->if_nextents--;
flags |= XFS_ILOG_CORE;
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
if ((error = xfs_btree_delete(cur, &i)))
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
break;
case BMAP_LEFT_FILLING:
/*
* Deleting the first part of the extent.
*/
got.br_startoff = del_endoff;
got.br_startblock = del_endblock;
got.br_blockcount -= del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &got);
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
error = xfs_bmbt_update(cur, &got);
if (error)
goto done;
break;
case BMAP_RIGHT_FILLING:
/*
* Deleting the last part of the extent.
*/
got.br_blockcount -= del->br_blockcount;
xfs_iext_update_extent(ip, state, icur, &got);
if (!cur) {
flags |= xfs_ilog_fext(whichfork);
break;
}
error = xfs_bmbt_update(cur, &got);
if (error)
goto done;
break;
case 0:
/*
* Deleting the middle of the extent.
*/
/*
* For directories, -ENOSPC is returned since a directory entry
* remove operation must not fail due to low extent count
* availability. -ENOSPC will be handled by higher layers of XFS
* by letting the corresponding empty Data/Free blocks to linger
* until a future remove operation. Dabtree blocks would be
* swapped with the last block in the leaf space and then the
* new last block will be unmapped.
*
* The above logic also applies to the source directory entry of
* a rename operation.
*/
error = xfs_iext_count_may_overflow(ip, whichfork, 1);
if (error) {
ASSERT(S_ISDIR(VFS_I(ip)->i_mode) &&
whichfork == XFS_DATA_FORK);
error = -ENOSPC;
goto done;
}
old = got;
got.br_blockcount = del->br_startoff - got.br_startoff;
xfs_iext_update_extent(ip, state, icur, &got);
new.br_startoff = del_endoff;
new.br_blockcount = got_endoff - del_endoff;
new.br_state = got.br_state;
new.br_startblock = del_endblock;
flags |= XFS_ILOG_CORE;
if (cur) {
error = xfs_bmbt_update(cur, &got);
if (error)
goto done;
error = xfs_btree_increment(cur, 0, &i);
if (error)
goto done;
cur->bc_rec.b = new;
error = xfs_btree_insert(cur, &i);
if (error && error != -ENOSPC)
goto done;
/*
* If get no-space back from btree insert, it tried a
* split, and we have a zero block reservation. Fix up
* our state and return the error.
*/
if (error == -ENOSPC) {
/*
* Reset the cursor, don't trust it after any
* insert operation.
*/
error = xfs_bmbt_lookup_eq(cur, &got, &i);
if (error)
goto done;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
/*
* Update the btree record back
* to the original value.
*/
error = xfs_bmbt_update(cur, &old);
if (error)
goto done;
/*
* Reset the extent record back
* to the original value.
*/
xfs_iext_update_extent(ip, state, icur, &old);
flags = 0;
error = -ENOSPC;
goto done;
}
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto done;
}
} else
flags |= xfs_ilog_fext(whichfork);
ifp->if_nextents++;
xfs_iext_next(ifp, icur);
xfs_iext_insert(ip, icur, &new, state);
break;
}
/* remove reverse mapping */
xfs_rmap_unmap_extent(tp, ip, whichfork, del);
/*
* If we need to, add to list of extents to delete.
*/
if (do_fx && !(bflags & XFS_BMAPI_REMAP)) {
if (xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK) {
xfs_refcount_decrease_extent(tp, del);
} else {
__xfs_free_extent_later(tp, del->br_startblock,
del->br_blockcount, NULL,
(bflags & XFS_BMAPI_NODISCARD) ||
del->br_state == XFS_EXT_UNWRITTEN);
}
}
/*
* Adjust inode # blocks in the file.
*/
if (nblks)
ip->i_nblocks -= nblks;
/*
* Adjust quota data.
*/
if (qfield && !(bflags & XFS_BMAPI_REMAP))
xfs_trans_mod_dquot_byino(tp, ip, qfield, (long)-nblks);
done:
*logflagsp = flags;
return error;
}
/*
* Unmap (remove) blocks from a file.
* If nexts is nonzero then the number of extents to remove is limited to
* that value. If not all extents in the block range can be removed then
* *done is set.
*/
int /* error */
__xfs_bunmapi(
struct xfs_trans *tp, /* transaction pointer */
struct xfs_inode *ip, /* incore inode */
xfs_fileoff_t start, /* first file offset deleted */
xfs_filblks_t *rlen, /* i/o: amount remaining */
int flags, /* misc flags */
xfs_extnum_t nexts) /* number of extents max */
{
struct xfs_btree_cur *cur; /* bmap btree cursor */
struct xfs_bmbt_irec del; /* extent being deleted */
int error; /* error return value */
xfs_extnum_t extno; /* extent number in list */
struct xfs_bmbt_irec got; /* current extent record */
struct xfs_ifork *ifp; /* inode fork pointer */
int isrt; /* freeing in rt area */
int logflags; /* transaction logging flags */
xfs_extlen_t mod; /* rt extent offset */
struct xfs_mount *mp = ip->i_mount;
int tmp_logflags; /* partial logging flags */
int wasdel; /* was a delayed alloc extent */
int whichfork; /* data or attribute fork */
xfs_fsblock_t sum;
xfs_filblks_t len = *rlen; /* length to unmap in file */
xfs_fileoff_t max_len;
xfs_fileoff_t end;
struct xfs_iext_cursor icur;
bool done = false;
trace_xfs_bunmap(ip, start, len, flags, _RET_IP_);
whichfork = xfs_bmapi_whichfork(flags);
ASSERT(whichfork != XFS_COW_FORK);
ifp = XFS_IFORK_PTR(ip, whichfork);
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)))
return -EFSCORRUPTED;
if (xfs_is_shutdown(mp))
return -EIO;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(len > 0);
ASSERT(nexts >= 0);
/*
* Guesstimate how many blocks we can unmap without running the risk of
* blowing out the transaction with a mix of EFIs and reflink
* adjustments.
*/
if (tp && xfs_is_reflink_inode(ip) && whichfork == XFS_DATA_FORK)
max_len = min(len, xfs_refcount_max_unmap(tp->t_log_res));
else
max_len = len;
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
if (xfs_iext_count(ifp) == 0) {
*rlen = 0;
return 0;
}
XFS_STATS_INC(mp, xs_blk_unmap);
isrt = (whichfork == XFS_DATA_FORK) && XFS_IS_REALTIME_INODE(ip);
end = start + len;
if (!xfs_iext_lookup_extent_before(ip, ifp, &end, &icur, &got)) {
*rlen = 0;
return 0;
}
end--;
logflags = 0;
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
ASSERT(ifp->if_format == XFS_DINODE_FMT_BTREE);
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_ino.flags = 0;
} else
cur = NULL;
if (isrt) {
/*
* Synchronize by locking the bitmap inode.
*/
xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
}
extno = 0;
while (end != (xfs_fileoff_t)-1 && end >= start &&
(nexts == 0 || extno < nexts) && max_len > 0) {
/*
* Is the found extent after a hole in which end lives?
* Just back up to the previous extent, if so.
*/
if (got.br_startoff > end &&
!xfs_iext_prev_extent(ifp, &icur, &got)) {
done = true;
break;
}
/*
* Is the last block of this extent before the range
* we're supposed to delete? If so, we're done.
*/
end = XFS_FILEOFF_MIN(end,
got.br_startoff + got.br_blockcount - 1);
if (end < start)
break;
/*
* Then deal with the (possibly delayed) allocated space
* we found.
*/
del = got;
wasdel = isnullstartblock(del.br_startblock);
if (got.br_startoff < start) {
del.br_startoff = start;
del.br_blockcount -= start - got.br_startoff;
if (!wasdel)
del.br_startblock += start - got.br_startoff;
}
if (del.br_startoff + del.br_blockcount > end + 1)
del.br_blockcount = end + 1 - del.br_startoff;
/* How much can we safely unmap? */
if (max_len < del.br_blockcount) {
del.br_startoff += del.br_blockcount - max_len;
if (!wasdel)
del.br_startblock += del.br_blockcount - max_len;
del.br_blockcount = max_len;
}
if (!isrt)
goto delete;
sum = del.br_startblock + del.br_blockcount;
div_u64_rem(sum, mp->m_sb.sb_rextsize, &mod);
if (mod) {
/*
* Realtime extent not lined up at the end.
* The extent could have been split into written
* and unwritten pieces, or we could just be
* unmapping part of it. But we can't really
* get rid of part of a realtime extent.
*/
if (del.br_state == XFS_EXT_UNWRITTEN) {
/*
* This piece is unwritten, or we're not
* using unwritten extents. Skip over it.
*/
ASSERT(end >= mod);
end -= mod > del.br_blockcount ?
del.br_blockcount : mod;
if (end < got.br_startoff &&
!xfs_iext_prev_extent(ifp, &icur, &got)) {
done = true;
break;
}
continue;
}
/*
* It's written, turn it unwritten.
* This is better than zeroing it.
*/
ASSERT(del.br_state == XFS_EXT_NORM);
ASSERT(tp->t_blk_res > 0);
/*
* If this spans a realtime extent boundary,
* chop it back to the start of the one we end at.
*/
if (del.br_blockcount > mod) {
del.br_startoff += del.br_blockcount - mod;
del.br_startblock += del.br_blockcount - mod;
del.br_blockcount = mod;
}
del.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent_unwritten_real(tp, ip,
whichfork, &icur, &cur, &del,
&logflags);
if (error)
goto error0;
goto nodelete;
}
div_u64_rem(del.br_startblock, mp->m_sb.sb_rextsize, &mod);
if (mod) {
xfs_extlen_t off = mp->m_sb.sb_rextsize - mod;
/*
* Realtime extent is lined up at the end but not
* at the front. We'll get rid of full extents if
* we can.
*/
if (del.br_blockcount > off) {
del.br_blockcount -= off;
del.br_startoff += off;
del.br_startblock += off;
} else if (del.br_startoff == start &&
(del.br_state == XFS_EXT_UNWRITTEN ||
tp->t_blk_res == 0)) {
/*
* Can't make it unwritten. There isn't
* a full extent here so just skip it.
*/
ASSERT(end >= del.br_blockcount);
end -= del.br_blockcount;
if (got.br_startoff > end &&
!xfs_iext_prev_extent(ifp, &icur, &got)) {
done = true;
break;
}
continue;
} else if (del.br_state == XFS_EXT_UNWRITTEN) {
struct xfs_bmbt_irec prev;
xfs_fileoff_t unwrite_start;
/*
* This one is already unwritten.
* It must have a written left neighbor.
* Unwrite the killed part of that one and
* try again.
*/
if (!xfs_iext_prev_extent(ifp, &icur, &prev))
ASSERT(0);
ASSERT(prev.br_state == XFS_EXT_NORM);
ASSERT(!isnullstartblock(prev.br_startblock));
ASSERT(del.br_startblock ==
prev.br_startblock + prev.br_blockcount);
unwrite_start = max3(start,
del.br_startoff - mod,
prev.br_startoff);
mod = unwrite_start - prev.br_startoff;
prev.br_startoff = unwrite_start;
prev.br_startblock += mod;
prev.br_blockcount -= mod;
prev.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent_unwritten_real(tp,
ip, whichfork, &icur, &cur,
&prev, &logflags);
if (error)
goto error0;
goto nodelete;
} else {
ASSERT(del.br_state == XFS_EXT_NORM);
del.br_state = XFS_EXT_UNWRITTEN;
error = xfs_bmap_add_extent_unwritten_real(tp,
ip, whichfork, &icur, &cur,
&del, &logflags);
if (error)
goto error0;
goto nodelete;
}
}
delete:
if (wasdel) {
error = xfs_bmap_del_extent_delay(ip, whichfork, &icur,
&got, &del);
} else {
error = xfs_bmap_del_extent_real(ip, tp, &icur, cur,
&del, &tmp_logflags, whichfork,
flags);
logflags |= tmp_logflags;
}
if (error)
goto error0;
max_len -= del.br_blockcount;
end = del.br_startoff - 1;
nodelete:
/*
* If not done go on to the next (previous) record.
*/
if (end != (xfs_fileoff_t)-1 && end >= start) {
if (!xfs_iext_get_extent(ifp, &icur, &got) ||
(got.br_startoff > end &&
!xfs_iext_prev_extent(ifp, &icur, &got))) {
done = true;
break;
}
extno++;
}
}
if (done || end == (xfs_fileoff_t)-1 || end < start)
*rlen = 0;
else
*rlen = end - start + 1;
/*
* Convert to a btree if necessary.
*/
if (xfs_bmap_needs_btree(ip, whichfork)) {
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
&tmp_logflags, whichfork);
logflags |= tmp_logflags;
} else {
error = xfs_bmap_btree_to_extents(tp, ip, cur, &logflags,
whichfork);
}
error0:
/*
* Log everything. Do this after conversion, there's no point in
* logging the extent records if we've converted to btree format.
*/
if ((logflags & xfs_ilog_fext(whichfork)) &&
ifp->if_format != XFS_DINODE_FMT_EXTENTS)
logflags &= ~xfs_ilog_fext(whichfork);
else if ((logflags & xfs_ilog_fbroot(whichfork)) &&
ifp->if_format != XFS_DINODE_FMT_BTREE)
logflags &= ~xfs_ilog_fbroot(whichfork);
/*
* Log inode even in the error case, if the transaction
* is dirty we'll need to shut down the filesystem.
*/
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
if (cur) {
if (!error)
cur->bc_ino.allocated = 0;
xfs_btree_del_cursor(cur, error);
}
return error;
}
/* Unmap a range of a file. */
int
xfs_bunmapi(
xfs_trans_t *tp,
struct xfs_inode *ip,
xfs_fileoff_t bno,
xfs_filblks_t len,
int flags,
xfs_extnum_t nexts,
int *done)
{
int error;
error = __xfs_bunmapi(tp, ip, bno, &len, flags, nexts);
*done = (len == 0);
return error;
}
/*
* Determine whether an extent shift can be accomplished by a merge with the
* extent that precedes the target hole of the shift.
*/
STATIC bool
xfs_bmse_can_merge(
struct xfs_bmbt_irec *left, /* preceding extent */
struct xfs_bmbt_irec *got, /* current extent to shift */
xfs_fileoff_t shift) /* shift fsb */
{
xfs_fileoff_t startoff;
startoff = got->br_startoff - shift;
/*
* The extent, once shifted, must be adjacent in-file and on-disk with
* the preceding extent.
*/
if ((left->br_startoff + left->br_blockcount != startoff) ||
(left->br_startblock + left->br_blockcount != got->br_startblock) ||
(left->br_state != got->br_state) ||
(left->br_blockcount + got->br_blockcount > MAXEXTLEN))
return false;
return true;
}
/*
* A bmap extent shift adjusts the file offset of an extent to fill a preceding
* hole in the file. If an extent shift would result in the extent being fully
* adjacent to the extent that currently precedes the hole, we can merge with
* the preceding extent rather than do the shift.
*
* This function assumes the caller has verified a shift-by-merge is possible
* with the provided extents via xfs_bmse_can_merge().
*/
STATIC int
xfs_bmse_merge(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
xfs_fileoff_t shift, /* shift fsb */
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got, /* extent to shift */
struct xfs_bmbt_irec *left, /* preceding extent */
struct xfs_btree_cur *cur,
int *logflags) /* output */
{
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_bmbt_irec new;
xfs_filblks_t blockcount;
int error, i;
struct xfs_mount *mp = ip->i_mount;
blockcount = left->br_blockcount + got->br_blockcount;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
ASSERT(xfs_bmse_can_merge(left, got, shift));
new = *left;
new.br_blockcount = blockcount;
/*
* Update the on-disk extent count, the btree if necessary and log the
* inode.
*/
ifp->if_nextents--;
*logflags |= XFS_ILOG_CORE;
if (!cur) {
*logflags |= XFS_ILOG_DEXT;
goto done;
}
/* lookup and remove the extent to merge */
error = xfs_bmbt_lookup_eq(cur, got, &i);
if (error)
return error;
if (XFS_IS_CORRUPT(mp, i != 1))
return -EFSCORRUPTED;
error = xfs_btree_delete(cur, &i);
if (error)
return error;
if (XFS_IS_CORRUPT(mp, i != 1))
return -EFSCORRUPTED;
/* lookup and update size of the previous extent */
error = xfs_bmbt_lookup_eq(cur, left, &i);
if (error)
return error;
if (XFS_IS_CORRUPT(mp, i != 1))
return -EFSCORRUPTED;
error = xfs_bmbt_update(cur, &new);
if (error)
return error;
/* change to extent format if required after extent removal */
error = xfs_bmap_btree_to_extents(tp, ip, cur, logflags, whichfork);
if (error)
return error;
done:
xfs_iext_remove(ip, icur, 0);
xfs_iext_prev(ifp, icur);
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
&new);
/* update reverse mapping. rmap functions merge the rmaps for us */
xfs_rmap_unmap_extent(tp, ip, whichfork, got);
memcpy(&new, got, sizeof(new));
new.br_startoff = left->br_startoff + left->br_blockcount;
xfs_rmap_map_extent(tp, ip, whichfork, &new);
return 0;
}
static int
xfs_bmap_shift_update_extent(
struct xfs_trans *tp,
struct xfs_inode *ip,
int whichfork,
struct xfs_iext_cursor *icur,
struct xfs_bmbt_irec *got,
struct xfs_btree_cur *cur,
int *logflags,
xfs_fileoff_t startoff)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_bmbt_irec prev = *got;
int error, i;
*logflags |= XFS_ILOG_CORE;
got->br_startoff = startoff;
if (cur) {
error = xfs_bmbt_lookup_eq(cur, &prev, &i);
if (error)
return error;
if (XFS_IS_CORRUPT(mp, i != 1))
return -EFSCORRUPTED;
error = xfs_bmbt_update(cur, got);
if (error)
return error;
} else {
*logflags |= XFS_ILOG_DEXT;
}
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), icur,
got);
/* update reverse mapping */
xfs_rmap_unmap_extent(tp, ip, whichfork, &prev);
xfs_rmap_map_extent(tp, ip, whichfork, got);
return 0;
}
int
xfs_bmap_collapse_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t *next_fsb,
xfs_fileoff_t offset_shift_fsb,
bool *done)
{
int whichfork = XFS_DATA_FORK;
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_irec got, prev;
struct xfs_iext_cursor icur;
xfs_fileoff_t new_startoff;
int error = 0;
int logflags = 0;
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
return -EFSCORRUPTED;
}
if (xfs_is_shutdown(mp))
return -EIO;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_ino.flags = 0;
}
if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
*done = true;
goto del_cursor;
}
if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) {
error = -EFSCORRUPTED;
goto del_cursor;
}
new_startoff = got.br_startoff - offset_shift_fsb;
if (xfs_iext_peek_prev_extent(ifp, &icur, &prev)) {
if (new_startoff < prev.br_startoff + prev.br_blockcount) {
error = -EINVAL;
goto del_cursor;
}
if (xfs_bmse_can_merge(&prev, &got, offset_shift_fsb)) {
error = xfs_bmse_merge(tp, ip, whichfork,
offset_shift_fsb, &icur, &got, &prev,
cur, &logflags);
if (error)
goto del_cursor;
goto done;
}
} else {
if (got.br_startoff < offset_shift_fsb) {
error = -EINVAL;
goto del_cursor;
}
}
error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got,
cur, &logflags, new_startoff);
if (error)
goto del_cursor;
done:
if (!xfs_iext_next_extent(ifp, &icur, &got)) {
*done = true;
goto del_cursor;
}
*next_fsb = got.br_startoff;
del_cursor:
if (cur)
xfs_btree_del_cursor(cur, error);
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
/* Make sure we won't be right-shifting an extent past the maximum bound. */
int
xfs_bmap_can_insert_extents(
struct xfs_inode *ip,
xfs_fileoff_t off,
xfs_fileoff_t shift)
{
struct xfs_bmbt_irec got;
int is_empty;
int error = 0;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
if (xfs_is_shutdown(ip->i_mount))
return -EIO;
xfs_ilock(ip, XFS_ILOCK_EXCL);
error = xfs_bmap_last_extent(NULL, ip, XFS_DATA_FORK, &got, &is_empty);
if (!error && !is_empty && got.br_startoff >= off &&
((got.br_startoff + shift) & BMBT_STARTOFF_MASK) < got.br_startoff)
error = -EINVAL;
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
int
xfs_bmap_insert_extents(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t *next_fsb,
xfs_fileoff_t offset_shift_fsb,
bool *done,
xfs_fileoff_t stop_fsb)
{
int whichfork = XFS_DATA_FORK;
struct xfs_mount *mp = ip->i_mount;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_irec got, next;
struct xfs_iext_cursor icur;
xfs_fileoff_t new_startoff;
int error = 0;
int logflags = 0;
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
return -EFSCORRUPTED;
}
if (xfs_is_shutdown(mp))
return -EIO;
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL));
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_ino.flags = 0;
}
if (*next_fsb == NULLFSBLOCK) {
xfs_iext_last(ifp, &icur);
if (!xfs_iext_get_extent(ifp, &icur, &got) ||
stop_fsb > got.br_startoff) {
*done = true;
goto del_cursor;
}
} else {
if (!xfs_iext_lookup_extent(ip, ifp, *next_fsb, &icur, &got)) {
*done = true;
goto del_cursor;
}
}
if (XFS_IS_CORRUPT(mp, isnullstartblock(got.br_startblock))) {
error = -EFSCORRUPTED;
goto del_cursor;
}
if (XFS_IS_CORRUPT(mp, stop_fsb > got.br_startoff)) {
error = -EFSCORRUPTED;
goto del_cursor;
}
new_startoff = got.br_startoff + offset_shift_fsb;
if (xfs_iext_peek_next_extent(ifp, &icur, &next)) {
if (new_startoff + got.br_blockcount > next.br_startoff) {
error = -EINVAL;
goto del_cursor;
}
/*
* Unlike a left shift (which involves a hole punch), a right
* shift does not modify extent neighbors in any way. We should
* never find mergeable extents in this scenario. Check anyways
* and warn if we encounter two extents that could be one.
*/
if (xfs_bmse_can_merge(&got, &next, offset_shift_fsb))
WARN_ON_ONCE(1);
}
error = xfs_bmap_shift_update_extent(tp, ip, whichfork, &icur, &got,
cur, &logflags, new_startoff);
if (error)
goto del_cursor;
if (!xfs_iext_prev_extent(ifp, &icur, &got) ||
stop_fsb >= got.br_startoff + got.br_blockcount) {
*done = true;
goto del_cursor;
}
*next_fsb = got.br_startoff;
del_cursor:
if (cur)
xfs_btree_del_cursor(cur, error);
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
/*
* Splits an extent into two extents at split_fsb block such that it is the
* first block of the current_ext. @ext is a target extent to be split.
* @split_fsb is a block where the extents is split. If split_fsb lies in a
* hole or the first block of extents, just return 0.
*/
int
xfs_bmap_split_extent(
struct xfs_trans *tp,
struct xfs_inode *ip,
xfs_fileoff_t split_fsb)
{
int whichfork = XFS_DATA_FORK;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
struct xfs_btree_cur *cur = NULL;
struct xfs_bmbt_irec got;
struct xfs_bmbt_irec new; /* split extent */
struct xfs_mount *mp = ip->i_mount;
xfs_fsblock_t gotblkcnt; /* new block count for got */
struct xfs_iext_cursor icur;
int error = 0;
int logflags = 0;
int i = 0;
if (XFS_IS_CORRUPT(mp, !xfs_ifork_has_extents(ifp)) ||
XFS_TEST_ERROR(false, mp, XFS_ERRTAG_BMAPIFORMAT)) {
return -EFSCORRUPTED;
}
if (xfs_is_shutdown(mp))
return -EIO;
/* Read in all the extents */
error = xfs_iread_extents(tp, ip, whichfork);
if (error)
return error;
/*
* If there are not extents, or split_fsb lies in a hole we are done.
*/
if (!xfs_iext_lookup_extent(ip, ifp, split_fsb, &icur, &got) ||
got.br_startoff >= split_fsb)
return 0;
gotblkcnt = split_fsb - got.br_startoff;
new.br_startoff = split_fsb;
new.br_startblock = got.br_startblock + gotblkcnt;
new.br_blockcount = got.br_blockcount - gotblkcnt;
new.br_state = got.br_state;
if (ifp->if_format == XFS_DINODE_FMT_BTREE) {
cur = xfs_bmbt_init_cursor(mp, tp, ip, whichfork);
cur->bc_ino.flags = 0;
error = xfs_bmbt_lookup_eq(cur, &got, &i);
if (error)
goto del_cursor;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto del_cursor;
}
}
got.br_blockcount = gotblkcnt;
xfs_iext_update_extent(ip, xfs_bmap_fork_to_state(whichfork), &icur,
&got);
logflags = XFS_ILOG_CORE;
if (cur) {
error = xfs_bmbt_update(cur, &got);
if (error)
goto del_cursor;
} else
logflags |= XFS_ILOG_DEXT;
/* Add new extent */
xfs_iext_next(ifp, &icur);
xfs_iext_insert(ip, &icur, &new, 0);
ifp->if_nextents++;
if (cur) {
error = xfs_bmbt_lookup_eq(cur, &new, &i);
if (error)
goto del_cursor;
if (XFS_IS_CORRUPT(mp, i != 0)) {
error = -EFSCORRUPTED;
goto del_cursor;
}
error = xfs_btree_insert(cur, &i);
if (error)
goto del_cursor;
if (XFS_IS_CORRUPT(mp, i != 1)) {
error = -EFSCORRUPTED;
goto del_cursor;
}
}
/*
* Convert to a btree if necessary.
*/
if (xfs_bmap_needs_btree(ip, whichfork)) {
int tmp_logflags; /* partial log flag return val */
ASSERT(cur == NULL);
error = xfs_bmap_extents_to_btree(tp, ip, &cur, 0,
&tmp_logflags, whichfork);
logflags |= tmp_logflags;
}
del_cursor:
if (cur) {
cur->bc_ino.allocated = 0;
xfs_btree_del_cursor(cur, error);
}
if (logflags)
xfs_trans_log_inode(tp, ip, logflags);
return error;
}
/* Deferred mapping is only for real extents in the data fork. */
static bool
xfs_bmap_is_update_needed(
struct xfs_bmbt_irec *bmap)
{
return bmap->br_startblock != HOLESTARTBLOCK &&
bmap->br_startblock != DELAYSTARTBLOCK;
}
/* Record a bmap intent. */
static int
__xfs_bmap_add(
struct xfs_trans *tp,
enum xfs_bmap_intent_type type,
struct xfs_inode *ip,
int whichfork,
struct xfs_bmbt_irec *bmap)
{
struct xfs_bmap_intent *bi;
trace_xfs_bmap_defer(tp->t_mountp,
XFS_FSB_TO_AGNO(tp->t_mountp, bmap->br_startblock),
type,
XFS_FSB_TO_AGBNO(tp->t_mountp, bmap->br_startblock),
ip->i_ino, whichfork,
bmap->br_startoff,
bmap->br_blockcount,
bmap->br_state);
bi = kmem_cache_alloc(xfs_bmap_intent_cache, GFP_NOFS | __GFP_NOFAIL);
INIT_LIST_HEAD(&bi->bi_list);
bi->bi_type = type;
bi->bi_owner = ip;
bi->bi_whichfork = whichfork;
bi->bi_bmap = *bmap;
xfs_defer_add(tp, XFS_DEFER_OPS_TYPE_BMAP, &bi->bi_list);
return 0;
}
/* Map an extent into a file. */
void
xfs_bmap_map_extent(
struct xfs_trans *tp,
struct xfs_inode *ip,
struct xfs_bmbt_irec *PREV)
{
if (!xfs_bmap_is_update_needed(PREV))
return;
__xfs_bmap_add(tp, XFS_BMAP_MAP, ip, XFS_DATA_FORK, PREV);
}
/* Unmap an extent out of a file. */
void
xfs_bmap_unmap_extent(
struct xfs_trans *tp,
struct xfs_inode *ip,
struct xfs_bmbt_irec *PREV)
{
if (!xfs_bmap_is_update_needed(PREV))
return;
__xfs_bmap_add(tp, XFS_BMAP_UNMAP, ip, XFS_DATA_FORK, PREV);
}
/*
* Process one of the deferred bmap operations. We pass back the
* btree cursor to maintain our lock on the bmapbt between calls.
*/
int
xfs_bmap_finish_one(
struct xfs_trans *tp,
struct xfs_inode *ip,
enum xfs_bmap_intent_type type,
int whichfork,
xfs_fileoff_t startoff,
xfs_fsblock_t startblock,
xfs_filblks_t *blockcount,
xfs_exntst_t state)
{
int error = 0;
ASSERT(tp->t_firstblock == NULLFSBLOCK);
trace_xfs_bmap_deferred(tp->t_mountp,
XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type,
XFS_FSB_TO_AGBNO(tp->t_mountp, startblock),
ip->i_ino, whichfork, startoff, *blockcount, state);
if (WARN_ON_ONCE(whichfork != XFS_DATA_FORK))
return -EFSCORRUPTED;
if (XFS_TEST_ERROR(false, tp->t_mountp,
XFS_ERRTAG_BMAP_FINISH_ONE))
return -EIO;
switch (type) {
case XFS_BMAP_MAP:
error = xfs_bmapi_remap(tp, ip, startoff, *blockcount,
startblock, 0);
*blockcount = 0;
break;
case XFS_BMAP_UNMAP:
error = __xfs_bunmapi(tp, ip, startoff, blockcount,
XFS_BMAPI_REMAP, 1);
break;
default:
ASSERT(0);
error = -EFSCORRUPTED;
}
return error;
}
/* Check that an inode's extent does not have invalid flags or bad ranges. */
xfs_failaddr_t
xfs_bmap_validate_extent(
struct xfs_inode *ip,
int whichfork,
struct xfs_bmbt_irec *irec)
{
struct xfs_mount *mp = ip->i_mount;
if (!xfs_verify_fileext(mp, irec->br_startoff, irec->br_blockcount))
return __this_address;
if (XFS_IS_REALTIME_INODE(ip) && whichfork == XFS_DATA_FORK) {
if (!xfs_verify_rtext(mp, irec->br_startblock,
irec->br_blockcount))
return __this_address;
} else {
if (!xfs_verify_fsbext(mp, irec->br_startblock,
irec->br_blockcount))
return __this_address;
}
if (irec->br_state != XFS_EXT_NORM && whichfork != XFS_DATA_FORK)
return __this_address;
return NULL;
}
int __init
xfs_bmap_intent_init_cache(void)
{
xfs_bmap_intent_cache = kmem_cache_create("xfs_bmap_intent",
sizeof(struct xfs_bmap_intent),
0, 0, NULL);
return xfs_bmap_intent_cache != NULL ? 0 : -ENOMEM;
}
void
xfs_bmap_intent_destroy_cache(void)
{
kmem_cache_destroy(xfs_bmap_intent_cache);
xfs_bmap_intent_cache = NULL;
}