[GFS2] The core of GFS2
This patch contains all the core files for GFS2.
Signed-off-by: David Teigland <teigland@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
new file mode 100644
index 0000000..73922db
--- /dev/null
+++ b/fs/gfs2/inode.c
@@ -0,0 +1,1805 @@
+/*
+ * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
+ * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License v.2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/posix_acl.h>
+#include <linux/sort.h>
+#include <asm/semaphore.h>
+
+#include "gfs2.h"
+#include "acl.h"
+#include "bmap.h"
+#include "dir.h"
+#include "eattr.h"
+#include "glock.h"
+#include "glops.h"
+#include "inode.h"
+#include "log.h"
+#include "meta_io.h"
+#include "ops_address.h"
+#include "ops_file.h"
+#include "ops_inode.h"
+#include "quota.h"
+#include "rgrp.h"
+#include "trans.h"
+#include "unlinked.h"
+
+/**
+ * inode_attr_in - Copy attributes from the dinode into the VFS inode
+ * @ip: The GFS2 inode (with embedded disk inode data)
+ * @inode: The Linux VFS inode
+ *
+ */
+
+static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode)
+{
+ inode->i_ino = ip->i_num.no_formal_ino;
+
+ switch (ip->i_di.di_mode & S_IFMT) {
+ case S_IFBLK:
+ case S_IFCHR:
+ inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
+ break;
+ default:
+ inode->i_rdev = 0;
+ break;
+ };
+
+ inode->i_mode = ip->i_di.di_mode;
+ inode->i_nlink = ip->i_di.di_nlink;
+ inode->i_uid = ip->i_di.di_uid;
+ inode->i_gid = ip->i_di.di_gid;
+ i_size_write(inode, ip->i_di.di_size);
+ inode->i_atime.tv_sec = ip->i_di.di_atime;
+ inode->i_mtime.tv_sec = ip->i_di.di_mtime;
+ inode->i_ctime.tv_sec = ip->i_di.di_ctime;
+ inode->i_atime.tv_nsec = 0;
+ inode->i_mtime.tv_nsec = 0;
+ inode->i_ctime.tv_nsec = 0;
+ inode->i_blksize = PAGE_SIZE;
+ inode->i_blocks = ip->i_di.di_blocks <<
+ (ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
+
+ if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
+ inode->i_flags |= S_IMMUTABLE;
+ else
+ inode->i_flags &= ~S_IMMUTABLE;
+
+ if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
+ inode->i_flags |= S_APPEND;
+ else
+ inode->i_flags &= ~S_APPEND;
+}
+
+/**
+ * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
+ * @ip: The GFS2 inode (with embedded disk inode data)
+ *
+ */
+
+void gfs2_inode_attr_in(struct gfs2_inode *ip)
+{
+ struct inode *inode;
+
+ inode = gfs2_ip2v_lookup(ip);
+ if (inode) {
+ inode_attr_in(ip, inode);
+ iput(inode);
+ }
+}
+
+/**
+ * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
+ * @ip: The GFS2 inode
+ *
+ * Only copy out the attributes that we want the VFS layer
+ * to be able to modify.
+ */
+
+void gfs2_inode_attr_out(struct gfs2_inode *ip)
+{
+ struct inode *inode = ip->i_vnode;
+
+ gfs2_assert_withdraw(ip->i_sbd,
+ (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
+ ip->i_di.di_mode = inode->i_mode;
+ ip->i_di.di_uid = inode->i_uid;
+ ip->i_di.di_gid = inode->i_gid;
+ ip->i_di.di_atime = inode->i_atime.tv_sec;
+ ip->i_di.di_mtime = inode->i_mtime.tv_sec;
+ ip->i_di.di_ctime = inode->i_ctime.tv_sec;
+}
+
+/**
+ * gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode
+ * @ip: the struct gfs2_inode to get the struct inode for
+ *
+ * Returns: A VFS inode, or NULL if none
+ */
+
+struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip)
+{
+ struct inode *inode = NULL;
+
+ gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags));
+
+ spin_lock(&ip->i_spin);
+ if (ip->i_vnode)
+ inode = igrab(ip->i_vnode);
+ spin_unlock(&ip->i_spin);
+
+ return inode;
+}
+
+/**
+ * gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode
+ * @ip: the struct gfs2_inode to get the struct inode for
+ *
+ * Returns: A VFS inode, or NULL if no mem
+ */
+
+struct inode *gfs2_ip2v(struct gfs2_inode *ip)
+{
+ struct inode *inode, *tmp;
+
+ inode = gfs2_ip2v_lookup(ip);
+ if (inode)
+ return inode;
+
+ tmp = new_inode(ip->i_sbd->sd_vfs);
+ if (!tmp)
+ return NULL;
+
+ inode_attr_in(ip, tmp);
+
+ if (S_ISREG(ip->i_di.di_mode)) {
+ tmp->i_op = &gfs2_file_iops;
+ tmp->i_fop = &gfs2_file_fops;
+ tmp->i_mapping->a_ops = &gfs2_file_aops;
+ } else if (S_ISDIR(ip->i_di.di_mode)) {
+ tmp->i_op = &gfs2_dir_iops;
+ tmp->i_fop = &gfs2_dir_fops;
+ } else if (S_ISLNK(ip->i_di.di_mode)) {
+ tmp->i_op = &gfs2_symlink_iops;
+ } else {
+ tmp->i_op = &gfs2_dev_iops;
+ init_special_inode(tmp, tmp->i_mode, tmp->i_rdev);
+ }
+
+ set_v2ip(tmp, NULL);
+
+ for (;;) {
+ spin_lock(&ip->i_spin);
+ if (!ip->i_vnode)
+ break;
+ inode = igrab(ip->i_vnode);
+ spin_unlock(&ip->i_spin);
+
+ if (inode) {
+ iput(tmp);
+ return inode;
+ }
+ yield();
+ }
+
+ inode = tmp;
+
+ gfs2_inode_hold(ip);
+ ip->i_vnode = inode;
+ set_v2ip(inode, ip);
+
+ spin_unlock(&ip->i_spin);
+
+ insert_inode_hash(inode);
+
+ return inode;
+}
+
+static int iget_test(struct inode *inode, void *opaque)
+{
+ struct gfs2_inode *ip = get_v2ip(inode);
+ struct gfs2_inum *inum = (struct gfs2_inum *)opaque;
+
+ if (ip && ip->i_num.no_addr == inum->no_addr)
+ return 1;
+
+ return 0;
+}
+
+struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
+{
+ return ilookup5(sb, (unsigned long)inum->no_formal_ino,
+ iget_test, inum);
+}
+
+void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type)
+{
+ spin_lock(&ip->i_spin);
+ if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) {
+ ip->i_di.di_nlink = 1;
+ ip->i_di.di_mode = DT2IF(type);
+ }
+ spin_unlock(&ip->i_spin);
+}
+
+/**
+ * gfs2_inode_refresh - Refresh the incore copy of the dinode
+ * @ip: The GFS2 inode
+ *
+ * Returns: errno
+ */
+
+int gfs2_inode_refresh(struct gfs2_inode *ip)
+{
+ struct buffer_head *dibh;
+ int error;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ return error;
+
+ if (gfs2_metatype_check(ip->i_sbd, dibh, GFS2_METATYPE_DI)) {
+ brelse(dibh);
+ return -EIO;
+ }
+
+ spin_lock(&ip->i_spin);
+ gfs2_dinode_in(&ip->i_di, dibh->b_data);
+ set_bit(GIF_MIN_INIT, &ip->i_flags);
+ spin_unlock(&ip->i_spin);
+
+ brelse(dibh);
+
+ if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+ if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
+ return -ESTALE;
+
+ ip->i_vn = ip->i_gl->gl_vn;
+
+ return 0;
+}
+
+/**
+ * inode_create - create a struct gfs2_inode
+ * @i_gl: The glock covering the inode
+ * @inum: The inode number
+ * @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode)
+ * @io_state: the state the iopen glock should be acquired in
+ * @ipp: pointer to put the returned inode in
+ *
+ * Returns: errno
+ */
+
+static int inode_create(struct gfs2_glock *i_gl, struct gfs2_inum *inum,
+ struct gfs2_glock *io_gl, unsigned int io_state,
+ struct gfs2_inode **ipp)
+{
+ struct gfs2_sbd *sdp = i_gl->gl_sbd;
+ struct gfs2_inode *ip;
+ int error = 0;
+
+ ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
+ if (!ip)
+ return -ENOMEM;
+ memset(ip, 0, sizeof(struct gfs2_inode));
+
+ ip->i_num = *inum;
+
+ atomic_set(&ip->i_count, 1);
+
+ ip->i_vn = i_gl->gl_vn - 1;
+
+ ip->i_gl = i_gl;
+ ip->i_sbd = sdp;
+
+ spin_lock_init(&ip->i_spin);
+ init_rwsem(&ip->i_rw_mutex);
+
+ ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
+
+ error = gfs2_glock_nq_init(io_gl,
+ io_state, GL_LOCAL_EXCL | GL_EXACT,
+ &ip->i_iopen_gh);
+ if (error)
+ goto fail;
+ ip->i_iopen_gh.gh_owner = NULL;
+
+ spin_lock(&io_gl->gl_spin);
+ gfs2_glock_hold(i_gl);
+ set_gl2gl(io_gl, i_gl);
+ spin_unlock(&io_gl->gl_spin);
+
+ gfs2_glock_hold(i_gl);
+ set_gl2ip(i_gl, ip);
+
+ atomic_inc(&sdp->sd_inode_count);
+
+ *ipp = ip;
+
+ return 0;
+
+ fail:
+ gfs2_meta_cache_flush(ip);
+ kmem_cache_free(gfs2_inode_cachep, ip);
+ *ipp = NULL;
+
+ return error;
+}
+
+/**
+ * gfs2_inode_get - Create or get a reference on an inode
+ * @i_gl: The glock covering the inode
+ * @inum: The inode number
+ * @create:
+ * @ipp: pointer to put the returned inode in
+ *
+ * Returns: errno
+ */
+
+int gfs2_inode_get(struct gfs2_glock *i_gl, struct gfs2_inum *inum, int create,
+ struct gfs2_inode **ipp)
+{
+ struct gfs2_sbd *sdp = i_gl->gl_sbd;
+ struct gfs2_glock *io_gl;
+ int error = 0;
+
+ gfs2_glmutex_lock(i_gl);
+
+ *ipp = get_gl2ip(i_gl);
+ if (*ipp) {
+ error = -ESTALE;
+ if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino)
+ goto out;
+ atomic_inc(&(*ipp)->i_count);
+ error = 0;
+ goto out;
+ }
+
+ if (!create)
+ goto out;
+
+ error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops,
+ CREATE, &io_gl);
+ if (!error) {
+ error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp);
+ gfs2_glock_put(io_gl);
+ }
+
+ out:
+ gfs2_glmutex_unlock(i_gl);
+
+ return error;
+}
+
+void gfs2_inode_hold(struct gfs2_inode *ip)
+{
+ gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
+ atomic_inc(&ip->i_count);
+}
+
+void gfs2_inode_put(struct gfs2_inode *ip)
+{
+ gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
+ atomic_dec(&ip->i_count);
+}
+
+void gfs2_inode_destroy(struct gfs2_inode *ip)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl;
+ struct gfs2_glock *i_gl = ip->i_gl;
+
+ gfs2_assert_warn(sdp, !atomic_read(&ip->i_count));
+ gfs2_assert(sdp, get_gl2gl(io_gl) == i_gl);
+
+ spin_lock(&io_gl->gl_spin);
+ set_gl2gl(io_gl, NULL);
+ gfs2_glock_put(i_gl);
+ spin_unlock(&io_gl->gl_spin);
+
+ gfs2_glock_dq_uninit(&ip->i_iopen_gh);
+
+ gfs2_meta_cache_flush(ip);
+ kmem_cache_free(gfs2_inode_cachep, ip);
+
+ set_gl2ip(i_gl, NULL);
+ gfs2_glock_put(i_gl);
+
+ atomic_dec(&sdp->sd_inode_count);
+}
+
+static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = ip->i_sbd;
+ struct gfs2_alloc *al;
+ struct gfs2_rgrpd *rgd;
+ int error;
+
+ if (ip->i_di.di_blocks != 1) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+
+ al = gfs2_alloc_get(ip);
+
+ error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto out;
+
+ error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
+ if (error)
+ goto out_qs;
+
+ rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
+ if (!rgd) {
+ gfs2_consist_inode(ip);
+ error = -EIO;
+ goto out_rindex_relse;
+ }
+
+ error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
+ &al->al_rgd_gh);
+ if (error)
+ goto out_rindex_relse;
+
+ error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
+ RES_STATFS + RES_QUOTA, 1);
+ if (error)
+ goto out_rg_gunlock;
+
+ gfs2_trans_add_gl(ip->i_gl);
+
+ gfs2_free_di(rgd, ip);
+
+ error = gfs2_unlinked_ondisk_rm(sdp, ul);
+
+ gfs2_trans_end(sdp);
+ clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+
+ out_rg_gunlock:
+ gfs2_glock_dq_uninit(&al->al_rgd_gh);
+
+ out_rindex_relse:
+ gfs2_glock_dq_uninit(&al->al_ri_gh);
+
+ out_qs:
+ gfs2_quota_unhold(ip);
+
+ out:
+ gfs2_alloc_put(ip);
+
+ return error;
+}
+
+/**
+ * inode_dealloc - Deallocate all on-disk blocks for an inode (dinode)
+ * @sdp: the filesystem
+ * @inum: the inode number to deallocate
+ * @io_gh: a holder for the iopen glock for this inode
+ *
+ * Returns: errno
+ */
+
+static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul,
+ struct gfs2_holder *io_gh)
+{
+ struct gfs2_inode *ip;
+ struct gfs2_holder i_gh;
+ int error;
+
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops,
+ LM_ST_EXCLUSIVE, 0, &i_gh);
+ if (error)
+ return error;
+
+ /* We reacquire the iopen lock here to avoid a race with the NFS server
+ calling gfs2_read_inode() with the inode number of a inode we're in
+ the process of deallocating. And we can't keep our hold on the lock
+ from inode_dealloc_init() for deadlock reasons. */
+
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY, io_gh);
+ error = gfs2_glock_nq(io_gh);
+ switch (error) {
+ case 0:
+ break;
+ case GLR_TRYFAILED:
+ error = 1;
+ default:
+ goto out;
+ }
+
+ gfs2_assert_warn(sdp, !get_gl2ip(i_gh.gh_gl));
+ error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl,
+ LM_ST_EXCLUSIVE, &ip);
+
+ gfs2_glock_dq(io_gh);
+
+ if (error)
+ goto out;
+
+ error = gfs2_inode_refresh(ip);
+ if (error)
+ goto out_iput;
+
+ if (ip->i_di.di_nlink) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ error = -EIO;
+ goto out_iput;
+ }
+
+ if (S_ISDIR(ip->i_di.di_mode) &&
+ (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
+ error = gfs2_dir_exhash_dealloc(ip);
+ if (error)
+ goto out_iput;
+ }
+
+ if (ip->i_di.di_eattr) {
+ error = gfs2_ea_dealloc(ip);
+ if (error)
+ goto out_iput;
+ }
+
+ if (!gfs2_is_stuffed(ip)) {
+ error = gfs2_file_dealloc(ip);
+ if (error)
+ goto out_iput;
+ }
+
+ error = dinode_dealloc(ip, ul);
+ if (error)
+ goto out_iput;
+
+ out_iput:
+ gfs2_glmutex_lock(i_gh.gh_gl);
+ gfs2_inode_put(ip);
+ gfs2_inode_destroy(ip);
+ gfs2_glmutex_unlock(i_gh.gh_gl);
+
+ out:
+ gfs2_glock_dq_uninit(&i_gh);
+
+ return error;
+}
+
+/**
+ * try_inode_dealloc - Try to deallocate an inode and all its blocks
+ * @sdp: the filesystem
+ *
+ * Returns: 0 on success, -errno on error, 1 on busy (inode open)
+ */
+
+static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+ struct gfs2_holder io_gh;
+ int error = 0;
+
+ gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum);
+
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_inum.no_addr, &gfs2_iopen_glops,
+ LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &io_gh);
+ switch (error) {
+ case 0:
+ break;
+ case GLR_TRYFAILED:
+ return 1;
+ default:
+ return error;
+ }
+
+ gfs2_glock_dq(&io_gh);
+ error = inode_dealloc(sdp, ul, &io_gh);
+ gfs2_holder_uninit(&io_gh);
+
+ return error;
+}
+
+static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+ struct gfs2_rgrpd *rgd;
+ struct gfs2_holder ri_gh, rgd_gh;
+ int error;
+
+ error = gfs2_rindex_hold(sdp, &ri_gh);
+ if (error)
+ return error;
+
+ rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr);
+ if (!rgd) {
+ gfs2_consist(sdp);
+ error = -EIO;
+ goto out;
+ }
+
+ error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh);
+ if (error)
+ goto out;
+
+ error = gfs2_trans_begin(sdp,
+ RES_RG_BIT + RES_UNLINKED + RES_STATFS,
+ 0);
+ if (error)
+ goto out_gunlock;
+
+ gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr);
+ gfs2_unlinked_ondisk_rm(sdp, ul);
+
+ gfs2_trans_end(sdp);
+
+ out_gunlock:
+ gfs2_glock_dq_uninit(&rgd_gh);
+ out:
+ gfs2_glock_dq_uninit(&ri_gh);
+
+ return error;
+}
+
+int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
+{
+ if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT)
+ return inode_dealloc_uninit(sdp, ul);
+ else
+ return try_inode_dealloc(sdp, ul);
+}
+
+/**
+ * gfs2_change_nlink - Change nlink count on inode
+ * @ip: The GFS2 inode
+ * @diff: The change in the nlink count required
+ *
+ * Returns: errno
+ */
+
+int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
+{
+ struct buffer_head *dibh;
+ uint32_t nlink;
+ int error;
+
+ nlink = ip->i_di.di_nlink + diff;
+
+ /* If we are reducing the nlink count, but the new value ends up being
+ bigger than the old one, we must have underflowed. */
+ if (diff < 0 && nlink > ip->i_di.di_nlink) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ return error;
+
+ ip->i_di.di_nlink = nlink;
+ ip->i_di.di_ctime = get_seconds();
+
+ gfs2_trans_add_bh(ip->i_gl, dibh);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ return 0;
+}
+
+/**
+ * gfs2_lookupi - Look up a filename in a directory and return its inode
+ * @d_gh: An initialized holder for the directory glock
+ * @name: The name of the inode to look for
+ * @is_root: If 1, ignore the caller's permissions
+ * @i_gh: An uninitialized holder for the new inode glock
+ *
+ * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
+ * @is_root is true.
+ *
+ * Returns: errno
+ */
+
+int gfs2_lookupi(struct gfs2_inode *dip, struct qstr *name, int is_root,
+ struct gfs2_inode **ipp)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_holder d_gh;
+ struct gfs2_inum inum;
+ unsigned int type;
+ struct gfs2_glock *gl;
+ int error;
+
+ if (!name->len || name->len > GFS2_FNAMESIZE)
+ return -ENAMETOOLONG;
+
+ if (gfs2_filecmp(name, ".", 1) ||
+ (gfs2_filecmp(name, "..", 2) && dip == sdp->sd_root_dir)) {
+ gfs2_inode_hold(dip);
+ *ipp = dip;
+ return 0;
+ }
+
+ error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
+ if (error)
+ return error;
+
+ if (!is_root) {
+ error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL);
+ if (error)
+ goto out;
+ }
+
+ error = gfs2_dir_search(dip, name, &inum, &type);
+ if (error)
+ goto out;
+
+ error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops,
+ CREATE, &gl);
+ if (error)
+ goto out;
+
+ error = gfs2_inode_get(gl, &inum, CREATE, ipp);
+ if (!error)
+ gfs2_inode_min_init(*ipp, type);
+
+ gfs2_glock_put(gl);
+
+ out:
+ gfs2_glock_dq_uninit(&d_gh);
+
+ return error;
+}
+
+static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
+{
+ struct gfs2_inode *ip = sdp->sd_ir_inode;
+ struct buffer_head *bh;
+ struct gfs2_inum_range ir;
+ int error;
+
+ error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+ if (error)
+ return error;
+ down(&sdp->sd_inum_mutex);
+
+ error = gfs2_meta_inode_buffer(ip, &bh);
+ if (error) {
+ up(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+ return error;
+ }
+
+ gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+ if (ir.ir_length) {
+ *formal_ino = ir.ir_start++;
+ ir.ir_length--;
+ gfs2_trans_add_bh(ip->i_gl, bh);
+ gfs2_inum_range_out(&ir,
+ bh->b_data + sizeof(struct gfs2_dinode));
+ brelse(bh);
+ up(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+ return 0;
+ }
+
+ brelse(bh);
+
+ up(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+
+ return 1;
+}
+
+static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
+{
+ struct gfs2_inode *ip = sdp->sd_ir_inode;
+ struct gfs2_inode *m_ip = sdp->sd_inum_inode;
+ struct gfs2_holder gh;
+ struct buffer_head *bh;
+ struct gfs2_inum_range ir;
+ int error;
+
+ error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+ if (error)
+ return error;
+
+ error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
+ if (error)
+ goto out;
+ down(&sdp->sd_inum_mutex);
+
+ error = gfs2_meta_inode_buffer(ip, &bh);
+ if (error)
+ goto out_end_trans;
+
+ gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+ if (!ir.ir_length) {
+ struct buffer_head *m_bh;
+ uint64_t x, y;
+
+ error = gfs2_meta_inode_buffer(m_ip, &m_bh);
+ if (error)
+ goto out_brelse;
+
+ x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
+ x = y = be64_to_cpu(x);
+ ir.ir_start = x;
+ ir.ir_length = GFS2_INUM_QUANTUM;
+ x += GFS2_INUM_QUANTUM;
+ if (x < y)
+ gfs2_consist_inode(m_ip);
+ x = cpu_to_be64(x);
+ gfs2_trans_add_bh(m_ip->i_gl, m_bh);
+ *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
+
+ brelse(m_bh);
+ }
+
+ *formal_ino = ir.ir_start++;
+ ir.ir_length--;
+
+ gfs2_trans_add_bh(ip->i_gl, bh);
+ gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
+
+ out_brelse:
+ brelse(bh);
+
+ out_end_trans:
+ up(&sdp->sd_inum_mutex);
+ gfs2_trans_end(sdp);
+
+ out:
+ gfs2_glock_dq_uninit(&gh);
+
+ return error;
+}
+
+static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
+{
+ int error;
+
+ error = pick_formal_ino_1(sdp, inum);
+ if (error <= 0)
+ return error;
+
+ error = pick_formal_ino_2(sdp, inum);
+
+ return error;
+}
+
+/**
+ * create_ok - OK to create a new on-disk inode here?
+ * @dip: Directory in which dinode is to be created
+ * @name: Name of new dinode
+ * @mode:
+ *
+ * Returns: errno
+ */
+
+static int create_ok(struct gfs2_inode *dip, struct qstr *name,
+ unsigned int mode)
+{
+ int error;
+
+ error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
+ if (error)
+ return error;
+
+ /* Don't create entries in an unlinked directory */
+ if (!dip->i_di.di_nlink)
+ return -EPERM;
+
+ error = gfs2_dir_search(dip, name, NULL, NULL);
+ switch (error) {
+ case -ENOENT:
+ error = 0;
+ break;
+ case 0:
+ return -EEXIST;
+ default:
+ return error;
+ }
+
+ if (dip->i_di.di_entries == (uint32_t)-1)
+ return -EFBIG;
+ if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
+ return -EMLINK;
+
+ return 0;
+}
+
+static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
+ unsigned int *uid, unsigned int *gid)
+{
+ if (dip->i_sbd->sd_args.ar_suiddir &&
+ (dip->i_di.di_mode & S_ISUID) &&
+ dip->i_di.di_uid) {
+ if (S_ISDIR(*mode))
+ *mode |= S_ISUID;
+ else if (dip->i_di.di_uid != current->fsuid)
+ *mode &= ~07111;
+ *uid = dip->i_di.di_uid;
+ } else
+ *uid = current->fsuid;
+
+ if (dip->i_di.di_mode & S_ISGID) {
+ if (S_ISDIR(*mode))
+ *mode |= S_ISGID;
+ *gid = dip->i_di.di_gid;
+ } else
+ *gid = current->fsgid;
+}
+
+static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ int error;
+
+ gfs2_alloc_get(dip);
+
+ dip->i_alloc.al_requested = RES_DINODE;
+ error = gfs2_inplace_reserve(dip);
+ if (error)
+ goto out;
+
+ error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
+ RES_STATFS, 0);
+ if (error)
+ goto out_ipreserv;
+
+ ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip);
+
+ ul->ul_ut.ut_flags = GFS2_UTF_UNINIT;
+ error = gfs2_unlinked_ondisk_add(sdp, ul);
+
+ gfs2_trans_end(sdp);
+
+ out_ipreserv:
+ gfs2_inplace_release(dip);
+
+ out:
+ gfs2_alloc_put(dip);
+
+ return error;
+}
+
+/**
+ * init_dinode - Fill in a new dinode structure
+ * @dip: the directory this inode is being created in
+ * @gl: The glock covering the new inode
+ * @inum: the inode number
+ * @mode: the file permissions
+ * @uid:
+ * @gid:
+ *
+ */
+
+static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
+ struct gfs2_inum *inum, unsigned int mode,
+ unsigned int uid, unsigned int gid)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_dinode di;
+ struct buffer_head *dibh;
+
+ dibh = gfs2_meta_new(gl, inum->no_addr);
+ gfs2_trans_add_bh(gl, dibh);
+ gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
+ gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
+
+ memset(&di, 0, sizeof(struct gfs2_dinode));
+ gfs2_meta_header_in(&di.di_header, dibh->b_data);
+ di.di_num = *inum;
+ di.di_mode = mode;
+ di.di_uid = uid;
+ di.di_gid = gid;
+ di.di_blocks = 1;
+ di.di_atime = di.di_mtime = di.di_ctime = get_seconds();
+ di.di_goal_meta = di.di_goal_data = inum->no_addr;
+
+ if (S_ISREG(mode)) {
+ if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
+ gfs2_tune_get(sdp, gt_new_files_jdata))
+ di.di_flags |= GFS2_DIF_JDATA;
+ if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
+ gfs2_tune_get(sdp, gt_new_files_directio))
+ di.di_flags |= GFS2_DIF_DIRECTIO;
+ } else if (S_ISDIR(mode)) {
+ di.di_flags |= (dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO);
+ di.di_flags |= (dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA);
+ }
+
+ gfs2_dinode_out(&di, dibh->b_data);
+ brelse(dibh);
+}
+
+static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
+ unsigned int mode, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ unsigned int uid, gid;
+ int error;
+
+ munge_mode_uid_gid(dip, &mode, &uid, &gid);
+
+ gfs2_alloc_get(dip);
+
+ error = gfs2_quota_lock(dip, uid, gid);
+ if (error)
+ goto out;
+
+ error = gfs2_quota_check(dip, uid, gid);
+ if (error)
+ goto out_quota;
+
+ error = gfs2_trans_begin(sdp, RES_DINODE + RES_UNLINKED +
+ RES_QUOTA, 0);
+ if (error)
+ goto out_quota;
+
+ ul->ul_ut.ut_flags = 0;
+ error = gfs2_unlinked_ondisk_munge(sdp, ul);
+
+ init_dinode(dip, gl, &ul->ul_ut.ut_inum,
+ mode, uid, gid);
+
+ gfs2_quota_change(dip, +1, uid, gid);
+
+ gfs2_trans_end(sdp);
+
+ out_quota:
+ gfs2_quota_unlock(dip);
+
+ out:
+ gfs2_alloc_put(dip);
+
+ return error;
+}
+
+static int link_dinode(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_alloc *al;
+ int alloc_required;
+ struct buffer_head *dibh;
+ int error;
+
+ al = gfs2_alloc_get(dip);
+
+ error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
+ if (error)
+ goto fail;
+
+ error = gfs2_diradd_alloc_required(dip, name, &alloc_required);
+ if (alloc_required) {
+ error = gfs2_quota_check(dip, dip->i_di.di_uid,
+ dip->i_di.di_gid);
+ if (error)
+ goto fail_quota_locks;
+
+ al->al_requested = sdp->sd_max_dirres;
+
+ error = gfs2_inplace_reserve(dip);
+ if (error)
+ goto fail_quota_locks;
+
+ error = gfs2_trans_begin(sdp,
+ sdp->sd_max_dirres +
+ al->al_rgd->rd_ri.ri_length +
+ 2 * RES_DINODE + RES_UNLINKED +
+ RES_STATFS + RES_QUOTA, 0);
+ if (error)
+ goto fail_ipreserv;
+ } else {
+ error = gfs2_trans_begin(sdp,
+ RES_LEAF +
+ 2 * RES_DINODE +
+ RES_UNLINKED, 0);
+ if (error)
+ goto fail_quota_locks;
+ }
+
+ error = gfs2_dir_add(dip, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
+ if (error)
+ goto fail_end_trans;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto fail_end_trans;
+ ip->i_di.di_nlink = 1;
+ gfs2_trans_add_bh(ip->i_gl, dibh);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ error = gfs2_unlinked_ondisk_rm(sdp, ul);
+ if (error)
+ goto fail_end_trans;
+
+ return 0;
+
+ fail_end_trans:
+ gfs2_trans_end(sdp);
+
+ fail_ipreserv:
+ if (dip->i_alloc.al_rgd)
+ gfs2_inplace_release(dip);
+
+ fail_quota_locks:
+ gfs2_quota_unlock(dip);
+
+ fail:
+ gfs2_alloc_put(dip);
+
+ return error;
+}
+
+/**
+ * gfs2_createi - Create a new inode
+ * @ghs: An array of two holders
+ * @name: The name of the new file
+ * @mode: the permissions on the new inode
+ *
+ * @ghs[0] is an initialized holder for the directory
+ * @ghs[1] is the holder for the inode lock
+ *
+ * If the return value is 0, the glocks on both the directory and the new
+ * file are held. A transaction has been started and an inplace reservation
+ * is held, as well.
+ *
+ * Returns: errno
+ */
+
+int gfs2_createi(struct gfs2_holder *ghs, struct qstr *name, unsigned int mode)
+{
+ struct gfs2_inode *dip = get_gl2ip(ghs->gh_gl);
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct gfs2_unlinked *ul;
+ struct gfs2_inode *ip;
+ int error;
+
+ if (!name->len || name->len > GFS2_FNAMESIZE)
+ return -ENAMETOOLONG;
+
+ error = gfs2_unlinked_get(sdp, &ul);
+ if (error)
+ return error;
+
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
+ error = gfs2_glock_nq(ghs);
+ if (error)
+ goto fail;
+
+ error = create_ok(dip, name, mode);
+ if (error)
+ goto fail_gunlock;
+
+ error = pick_formal_ino(sdp, &ul->ul_ut.ut_inum.no_formal_ino);
+ if (error)
+ goto fail_gunlock;
+
+ error = alloc_dinode(dip, ul);
+ if (error)
+ goto fail_gunlock;
+
+ if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) {
+ gfs2_glock_dq(ghs);
+
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_inum.no_addr,
+ &gfs2_inode_glops,
+ LM_ST_EXCLUSIVE, GL_SKIP,
+ ghs + 1);
+ if (error) {
+ gfs2_unlinked_put(sdp, ul);
+ return error;
+ }
+
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
+ error = gfs2_glock_nq(ghs);
+ if (error) {
+ gfs2_glock_dq_uninit(ghs + 1);
+ gfs2_unlinked_put(sdp, ul);
+ return error;
+ }
+
+ error = create_ok(dip, name, mode);
+ if (error)
+ goto fail_gunlock2;
+ } else {
+ error = gfs2_glock_nq_num(sdp,
+ ul->ul_ut.ut_inum.no_addr,
+ &gfs2_inode_glops,
+ LM_ST_EXCLUSIVE, GL_SKIP,
+ ghs + 1);
+ if (error)
+ goto fail_gunlock;
+ }
+
+ error = make_dinode(dip, ghs[1].gh_gl, mode, ul);
+ if (error)
+ goto fail_gunlock2;
+
+ error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip);
+ if (error)
+ goto fail_gunlock2;
+
+ error = gfs2_inode_refresh(ip);
+ if (error)
+ goto fail_iput;
+
+ error = gfs2_acl_create(dip, ip);
+ if (error)
+ goto fail_iput;
+
+ error = link_dinode(dip, name, ip, ul);
+ if (error)
+ goto fail_iput;
+
+ gfs2_unlinked_put(sdp, ul);
+
+ return 0;
+
+ fail_iput:
+ gfs2_inode_put(ip);
+
+ fail_gunlock2:
+ gfs2_glock_dq_uninit(ghs + 1);
+
+ fail_gunlock:
+ gfs2_glock_dq(ghs);
+
+ fail:
+ gfs2_unlinked_put(sdp, ul);
+
+ return error;
+}
+
+/**
+ * gfs2_unlinki - Unlink a file
+ * @dip: The inode of the directory
+ * @name: The name of the file to be unlinked
+ * @ip: The inode of the file to be removed
+ *
+ * Assumes Glocks on both dip and ip are held.
+ *
+ * Returns: errno
+ */
+
+int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ int error;
+
+ error = gfs2_dir_del(dip, name);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(ip, -1);
+ if (error)
+ return error;
+
+ /* If this inode is being unlinked from the directory structure,
+ we need to mark that in the log so that it isn't lost during
+ a crash. */
+
+ if (!ip->i_di.di_nlink) {
+ ul->ul_ut.ut_inum = ip->i_num;
+ error = gfs2_unlinked_ondisk_add(sdp, ul);
+ if (!error)
+ set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+ }
+
+ return error;
+}
+
+/**
+ * gfs2_rmdiri - Remove a directory
+ * @dip: The parent directory of the directory to be removed
+ * @name: The name of the directory to be removed
+ * @ip: The GFS2 inode of the directory to be removed
+ *
+ * Assumes Glocks on dip and ip are held
+ *
+ * Returns: errno
+ */
+
+int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip, struct gfs2_unlinked *ul)
+{
+ struct gfs2_sbd *sdp = dip->i_sbd;
+ struct qstr dotname;
+ int error;
+
+ if (ip->i_di.di_entries != 2) {
+ if (gfs2_consist_inode(ip))
+ gfs2_dinode_print(&ip->i_di);
+ return -EIO;
+ }
+
+ error = gfs2_dir_del(dip, name);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(dip, -1);
+ if (error)
+ return error;
+
+ dotname.len = 1;
+ dotname.name = ".";
+ error = gfs2_dir_del(ip, &dotname);
+ if (error)
+ return error;
+
+ dotname.len = 2;
+ dotname.name = "..";
+ error = gfs2_dir_del(ip, &dotname);
+ if (error)
+ return error;
+
+ error = gfs2_change_nlink(ip, -2);
+ if (error)
+ return error;
+
+ /* This inode is being unlinked from the directory structure and
+ we need to mark that in the log so that it isn't lost during
+ a crash. */
+
+ ul->ul_ut.ut_inum = ip->i_num;
+ error = gfs2_unlinked_ondisk_add(sdp, ul);
+ if (!error)
+ set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
+
+ return error;
+}
+
+/*
+ * gfs2_unlink_ok - check to see that a inode is still in a directory
+ * @dip: the directory
+ * @name: the name of the file
+ * @ip: the inode
+ *
+ * Assumes that the lock on (at least) @dip is held.
+ *
+ * Returns: 0 if the parent/child relationship is correct, errno if it isn't
+ */
+
+int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name,
+ struct gfs2_inode *ip)
+{
+ struct gfs2_inum inum;
+ unsigned int type;
+ int error;
+
+ if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode))
+ return -EPERM;
+
+ if ((dip->i_di.di_mode & S_ISVTX) &&
+ dip->i_di.di_uid != current->fsuid &&
+ ip->i_di.di_uid != current->fsuid &&
+ !capable(CAP_FOWNER))
+ return -EPERM;
+
+ if (IS_APPEND(dip->i_vnode))
+ return -EPERM;
+
+ error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
+ if (error)
+ return error;
+
+ error = gfs2_dir_search(dip, name, &inum, &type);
+ if (error)
+ return error;
+
+ if (!gfs2_inum_equal(&inum, &ip->i_num))
+ return -ENOENT;
+
+ if (IF2DT(ip->i_di.di_mode) != type) {
+ gfs2_consist_inode(dip);
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/*
+ * gfs2_ok_to_move - check if it's ok to move a directory to another directory
+ * @this: move this
+ * @to: to here
+ *
+ * Follow @to back to the root and make sure we don't encounter @this
+ * Assumes we already hold the rename lock.
+ *
+ * Returns: errno
+ */
+
+int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
+{
+ struct gfs2_sbd *sdp = this->i_sbd;
+ struct gfs2_inode *tmp;
+ struct qstr dotdot;
+ int error = 0;
+
+ memset(&dotdot, 0, sizeof(struct qstr));
+ dotdot.name = "..";
+ dotdot.len = 2;
+
+ gfs2_inode_hold(to);
+
+ for (;;) {
+ if (to == this) {
+ error = -EINVAL;
+ break;
+ }
+ if (to == sdp->sd_root_dir) {
+ error = 0;
+ break;
+ }
+
+ error = gfs2_lookupi(to, &dotdot, 1, &tmp);
+ if (error)
+ break;
+
+ gfs2_inode_put(to);
+ to = tmp;
+ }
+
+ gfs2_inode_put(to);
+
+ return error;
+}
+
+/**
+ * gfs2_readlinki - return the contents of a symlink
+ * @ip: the symlink's inode
+ * @buf: a pointer to the buffer to be filled
+ * @len: a pointer to the length of @buf
+ *
+ * If @buf is too small, a piece of memory is kmalloc()ed and needs
+ * to be freed by the caller.
+ *
+ * Returns: errno
+ */
+
+int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
+{
+ struct gfs2_holder i_gh;
+ struct buffer_head *dibh;
+ unsigned int x;
+ int error;
+
+ gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
+ error = gfs2_glock_nq_atime(&i_gh);
+ if (error) {
+ gfs2_holder_uninit(&i_gh);
+ return error;
+ }
+
+ if (!ip->i_di.di_size) {
+ gfs2_consist_inode(ip);
+ error = -EIO;
+ goto out;
+ }
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto out;
+
+ x = ip->i_di.di_size + 1;
+ if (x > *len) {
+ *buf = kmalloc(x, GFP_KERNEL);
+ if (!*buf) {
+ error = -ENOMEM;
+ goto out_brelse;
+ }
+ }
+
+ memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
+ *len = x;
+
+ out_brelse:
+ brelse(dibh);
+
+ out:
+ gfs2_glock_dq_uninit(&i_gh);
+
+ return error;
+}
+
+/**
+ * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
+ * conditionally update the inode's atime
+ * @gh: the holder to acquire
+ *
+ * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
+ * Update if the difference between the current time and the inode's current
+ * atime is greater than an interval specified at mount.
+ *
+ * Returns: errno
+ */
+
+int gfs2_glock_nq_atime(struct gfs2_holder *gh)
+{
+ struct gfs2_glock *gl = gh->gh_gl;
+ struct gfs2_sbd *sdp = gl->gl_sbd;
+ struct gfs2_inode *ip = get_gl2ip(gl);
+ int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
+ unsigned int state;
+ int flags;
+ int error;
+
+ if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
+ gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
+ gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
+ return -EINVAL;
+
+ state = gh->gh_state;
+ flags = gh->gh_flags;
+
+ error = gfs2_glock_nq(gh);
+ if (error)
+ return error;
+
+ if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
+ (sdp->sd_vfs->s_flags & MS_RDONLY))
+ return 0;
+
+ curtime = get_seconds();
+ if (curtime - ip->i_di.di_atime >= quantum) {
+ gfs2_glock_dq(gh);
+ gfs2_holder_reinit(LM_ST_EXCLUSIVE,
+ gh->gh_flags & ~LM_FLAG_ANY,
+ gh);
+ error = gfs2_glock_nq(gh);
+ if (error)
+ return error;
+
+ /* Verify that atime hasn't been updated while we were
+ trying to get exclusive lock. */
+
+ curtime = get_seconds();
+ if (curtime - ip->i_di.di_atime >= quantum) {
+ struct buffer_head *dibh;
+
+ error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+ if (error == -EROFS)
+ return 0;
+ if (error)
+ goto fail;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (error)
+ goto fail_end_trans;
+
+ ip->i_di.di_atime = curtime;
+
+ gfs2_trans_add_bh(ip->i_gl, dibh);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+
+ gfs2_trans_end(sdp);
+ }
+
+ /* If someone else has asked for the glock,
+ unlock and let them have it. Then reacquire
+ in the original state. */
+ if (gfs2_glock_is_blocking(gl)) {
+ gfs2_glock_dq(gh);
+ gfs2_holder_reinit(state, flags, gh);
+ return gfs2_glock_nq(gh);
+ }
+ }
+
+ return 0;
+
+ fail_end_trans:
+ gfs2_trans_end(sdp);
+
+ fail:
+ gfs2_glock_dq(gh);
+
+ return error;
+}
+
+/**
+ * glock_compare_atime - Compare two struct gfs2_glock structures for sort
+ * @arg_a: the first structure
+ * @arg_b: the second structure
+ *
+ * Returns: 1 if A > B
+ * -1 if A < B
+ * 0 if A = B
+ */
+
+static int glock_compare_atime(const void *arg_a, const void *arg_b)
+{
+ struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
+ struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
+ struct lm_lockname *a = &gh_a->gh_gl->gl_name;
+ struct lm_lockname *b = &gh_b->gh_gl->gl_name;
+ int ret = 0;
+
+ if (a->ln_number > b->ln_number)
+ ret = 1;
+ else if (a->ln_number < b->ln_number)
+ ret = -1;
+ else {
+ if (gh_a->gh_state == LM_ST_SHARED &&
+ gh_b->gh_state == LM_ST_EXCLUSIVE)
+ ret = 1;
+ else if (gh_a->gh_state == LM_ST_SHARED &&
+ (gh_b->gh_flags & GL_ATIME))
+ ret = 1;
+ }
+
+ return ret;
+}
+
+/**
+ * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
+ * atime update
+ * @num_gh: the number of structures
+ * @ghs: an array of struct gfs2_holder structures
+ *
+ * Returns: 0 on success (all glocks acquired),
+ * errno on failure (no glocks acquired)
+ */
+
+int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
+{
+ struct gfs2_holder **p;
+ unsigned int x;
+ int error = 0;
+
+ if (!num_gh)
+ return 0;
+
+ if (num_gh == 1) {
+ ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
+ if (ghs->gh_flags & GL_ATIME)
+ error = gfs2_glock_nq_atime(ghs);
+ else
+ error = gfs2_glock_nq(ghs);
+ return error;
+ }
+
+ p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ for (x = 0; x < num_gh; x++)
+ p[x] = &ghs[x];
+
+ sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
+
+ for (x = 0; x < num_gh; x++) {
+ p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
+
+ if (p[x]->gh_flags & GL_ATIME)
+ error = gfs2_glock_nq_atime(p[x]);
+ else
+ error = gfs2_glock_nq(p[x]);
+
+ if (error) {
+ while (x--)
+ gfs2_glock_dq(p[x]);
+ break;
+ }
+ }
+
+ kfree(p);
+
+ return error;
+}
+
+/**
+ * gfs2_try_toss_vnode - See if we can toss a vnode from memory
+ * @ip: the inode
+ *
+ * Returns: 1 if the vnode was tossed
+ */
+
+void gfs2_try_toss_vnode(struct gfs2_inode *ip)
+{
+ struct inode *inode;
+
+ inode = gfs2_ip2v_lookup(ip);
+ if (!inode)
+ return;
+
+ d_prune_aliases(inode);
+
+ if (S_ISDIR(ip->i_di.di_mode)) {
+ struct list_head *head = &inode->i_dentry;
+ struct dentry *d = NULL;
+
+ spin_lock(&dcache_lock);
+ if (list_empty(head))
+ spin_unlock(&dcache_lock);
+ else {
+ d = list_entry(head->next, struct dentry, d_alias);
+ dget_locked(d);
+ spin_unlock(&dcache_lock);
+
+ if (have_submounts(d))
+ dput(d);
+ else {
+ shrink_dcache_parent(d);
+ dput(d);
+ d_prune_aliases(inode);
+ }
+ }
+ }
+
+ inode->i_nlink = 0;
+ iput(inode);
+}
+
+
+static int
+__gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+ struct buffer_head *dibh;
+ int error;
+
+ error = gfs2_meta_inode_buffer(ip, &dibh);
+ if (!error) {
+ error = inode_setattr(ip->i_vnode, attr);
+ gfs2_assert_warn(ip->i_sbd, !error);
+ gfs2_inode_attr_out(ip);
+
+ gfs2_trans_add_bh(ip->i_gl, dibh);
+ gfs2_dinode_out(&ip->i_di, dibh->b_data);
+ brelse(dibh);
+ }
+ return error;
+}
+
+/**
+ * gfs2_setattr_simple -
+ * @ip:
+ * @attr:
+ *
+ * Called with a reference on the vnode.
+ *
+ * Returns: errno
+ */
+
+int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
+{
+ int error;
+
+ if (get_transaction)
+ return __gfs2_setattr_simple(ip, attr);
+
+ error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0);
+ if (error)
+ return error;
+
+ error = __gfs2_setattr_simple(ip, attr);
+
+ gfs2_trans_end(ip->i_sbd);
+
+ return error;
+}
+
+int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd)
+{
+ return permission(inode, mask, nd);
+}
+