fs/affs/inode.c - SHIFTPHONES/mainline/linux - Gitiles

 /*
  *  linux/fs/affs/inode.c
  *
  *  (c) 1996  Hans-Joachim Widmaier - Rewritten
  *
  *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
  *
  *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
  *
  *  (C) 1991  Linus Torvalds - minix filesystem
  */
 #include <linux/sched.h>
 #include <linux/gfp.h>
 #include "affs.h"

 struct inode *affs_iget(struct super_block *sb, unsigned long ino)
 {
 	struct affs_sb_info	*sbi = AFFS_SB(sb);
 	struct buffer_head	*bh;
 	struct affs_tail	*tail;
 	struct inode		*inode;
 	u32			 block;
 	u32			 size;
 	u32			 prot;
 	u16			 id;

 	inode = iget_locked(sb, ino);
 	if (!inode)
 		return ERR_PTR(-ENOMEM);
 	if (!(inode->i_state & I_NEW))
 		return inode;

 	pr_debug("affs_iget(%lu)\n", inode->i_ino);

 	block = inode->i_ino;
 	bh = affs_bread(sb, block);
 	if (!bh) {
 		affs_warning(sb, "read_inode", "Cannot read block %d", block);
 		goto bad_inode;
 	}
 	if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
 		affs_warning(sb,"read_inode",
 			   "Checksum or type (ptype=%d) error on inode %d",
 			   AFFS_HEAD(bh)->ptype, block);
 		goto bad_inode;
 	}

 	tail = AFFS_TAIL(sb, bh);
 	prot = be32_to_cpu(tail->protect);

 	inode->i_size = 0;
 	set_nlink(inode, 1);
 	inode->i_mode = 0;
 	AFFS_I(inode)->i_extcnt = 1;
 	AFFS_I(inode)->i_ext_last = ~1;
 	AFFS_I(inode)->i_protect = prot;
 	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 	AFFS_I(inode)->i_blkcnt = 0;
 	AFFS_I(inode)->i_lc = NULL;
 	AFFS_I(inode)->i_lc_size = 0;
 	AFFS_I(inode)->i_lc_shift = 0;
 	AFFS_I(inode)->i_lc_mask = 0;
 	AFFS_I(inode)->i_ac = NULL;
 	AFFS_I(inode)->i_ext_bh = NULL;
 	AFFS_I(inode)->mmu_private = 0;
 	AFFS_I(inode)->i_lastalloc = 0;
 	AFFS_I(inode)->i_pa_cnt = 0;

 	if (sbi->s_flags & AFFS_MOUNT_SF_SETMODE)
 		inode->i_mode = sbi->s_mode;
 	else
 		inode->i_mode = prot_to_mode(prot);

 	id = be16_to_cpu(tail->uid);
 	if (id == 0 || sbi->s_flags & AFFS_MOUNT_SF_SETUID)
 		inode->i_uid = sbi->s_uid;
 	else if (id == 0xFFFF && sbi->s_flags & AFFS_MOUNT_SF_MUFS)
 		i_uid_write(inode, 0);
 	else
 		i_uid_write(inode, id);

 	id = be16_to_cpu(tail->gid);
 	if (id == 0 || sbi->s_flags & AFFS_MOUNT_SF_SETGID)
 		inode->i_gid = sbi->s_gid;
 	else if (id == 0xFFFF && sbi->s_flags & AFFS_MOUNT_SF_MUFS)
 		i_gid_write(inode, 0);
 	else
 		i_gid_write(inode, id);

 	switch (be32_to_cpu(tail->stype)) {
 	case ST_ROOT:
 		inode->i_uid = sbi->s_uid;
 		inode->i_gid = sbi->s_gid;
 		/* fall through */
 	case ST_USERDIR:
 		if (be32_to_cpu(tail->stype) == ST_USERDIR ||
 		    sbi->s_flags & AFFS_MOUNT_SF_SETMODE) {
 			if (inode->i_mode & S_IRUSR)
 				inode->i_mode |= S_IXUSR;
 			if (inode->i_mode & S_IRGRP)
 				inode->i_mode |= S_IXGRP;
 			if (inode->i_mode & S_IROTH)
 				inode->i_mode |= S_IXOTH;
 			inode->i_mode |= S_IFDIR;
 		} else
 			inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 		/* Maybe it should be controlled by mount parameter? */
 		//inode->i_mode |= S_ISVTX;
 		inode->i_op = &affs_dir_inode_operations;
 		inode->i_fop = &affs_dir_operations;
 		break;
 	case ST_LINKDIR:
 #if 0
 		affs_warning(sb, "read_inode", "inode is LINKDIR");
 		goto bad_inode;
 #else
 		inode->i_mode |= S_IFDIR;
 		/* ... and leave ->i_op and ->i_fop pointing to empty */
 		break;
 #endif
 	case ST_LINKFILE:
 		affs_warning(sb, "read_inode", "inode is LINKFILE");
 		goto bad_inode;
 	case ST_FILE:
 		size = be32_to_cpu(tail->size);
 		inode->i_mode |= S_IFREG;
 		AFFS_I(inode)->mmu_private = inode->i_size = size;
 		if (inode->i_size) {
 			AFFS_I(inode)->i_blkcnt = (size - 1) /
 					       sbi->s_data_blksize + 1;
 			AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
 					       sbi->s_hashsize + 1;
 		}
 		if (tail->link_chain)
 			set_nlink(inode, 2);
 		inode->i_mapping->a_ops = (sbi->s_flags & AFFS_MOUNT_SF_OFS) ?
 					  &affs_aops_ofs : &affs_aops;
 		inode->i_op = &affs_file_inode_operations;
 		inode->i_fop = &affs_file_operations;
 		break;
 	case ST_SOFTLINK:
 		inode->i_mode |= S_IFLNK;
 		inode->i_op = &affs_symlink_inode_operations;
 		inode->i_data.a_ops = &affs_symlink_aops;
 		break;
 	}

 	inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
 		       = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
 		         be32_to_cpu(tail->change.mins) * 60 +
 			 be32_to_cpu(tail->change.ticks) / 50 +
 			 ((8 * 365 + 2) * 24 * 60 * 60)) +
 			 sys_tz.tz_minuteswest * 60;
 	inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
 	affs_brelse(bh);
 	unlock_new_inode(inode);
 	return inode;

 bad_inode:
 	affs_brelse(bh);
 	iget_failed(inode);
 	return ERR_PTR(-EIO);
 }

 int
 affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 {
 	struct super_block	*sb = inode->i_sb;
 	struct buffer_head	*bh;
 	struct affs_tail	*tail;
 	uid_t			 uid;
 	gid_t			 gid;

 	pr_debug("write_inode(%lu)\n", inode->i_ino);

 	if (!inode->i_nlink)
 		// possibly free block
 		return 0;
 	bh = affs_bread(sb, inode->i_ino);
 	if (!bh) {
 		affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 		return -EIO;
 	}
 	tail = AFFS_TAIL(sb, bh);
 	if (tail->stype == cpu_to_be32(ST_ROOT)) {
 		secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
 	} else {
 		tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 		tail->size = cpu_to_be32(inode->i_size);
 		secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
 		if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 			uid = i_uid_read(inode);
 			gid = i_gid_read(inode);
 			if (AFFS_SB(sb)->s_flags & AFFS_MOUNT_SF_MUFS) {
 				if (uid == 0 || uid == 0xFFFF)
 					uid = uid ^ ~0;
 				if (gid == 0 || gid == 0xFFFF)
 					gid = gid ^ ~0;
 			}
 			if (!(AFFS_SB(sb)->s_flags & AFFS_MOUNT_SF_SETUID))
 				tail->uid = cpu_to_be16(uid);
 			if (!(AFFS_SB(sb)->s_flags & AFFS_MOUNT_SF_SETGID))
 				tail->gid = cpu_to_be16(gid);
 		}
 	}
 	affs_fix_checksum(sb, bh);
 	mark_buffer_dirty_inode(bh, inode);
 	affs_brelse(bh);
 	affs_free_prealloc(inode);
 	return 0;
 }

 int
 affs_notify_change(struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = dentry->d_inode;
 	int error;

 	pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);

 	error = inode_change_ok(inode,attr);
 	if (error)
 		goto out;

 	if (((attr->ia_valid & ATTR_UID) &&
 	     (AFFS_SB(inode->i_sb)->s_flags & AFFS_MOUNT_SF_SETUID)) ||
 	    ((attr->ia_valid & ATTR_GID) &&
 	     (AFFS_SB(inode->i_sb)->s_flags & AFFS_MOUNT_SF_SETGID)) ||
 	    ((attr->ia_valid & ATTR_MODE) &&
 	     (AFFS_SB(inode->i_sb)->s_flags &
 	      (AFFS_MOUNT_SF_SETMODE | AFFS_MOUNT_SF_IMMUTABLE)))) {
 		if (!(AFFS_SB(inode->i_sb)->s_flags & AFFS_MOUNT_SF_QUIET))
 			error = -EPERM;
 		goto out;
 	}

 	if ((attr->ia_valid & ATTR_SIZE) &&
 	    attr->ia_size != i_size_read(inode)) {
 		error = inode_newsize_ok(inode, attr->ia_size);
 		if (error)
 			return error;

 		truncate_setsize(inode, attr->ia_size);
 		affs_truncate(inode);
 	}

 	setattr_copy(inode, attr);
 	mark_inode_dirty(inode);

 	if (attr->ia_valid & ATTR_MODE)
 		mode_to_prot(inode);
 out:
 	return error;
 }

 void
 affs_evict_inode(struct inode *inode)
 {
 	unsigned long cache_page;
 	pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
 		 inode->i_ino, inode->i_nlink);
 	truncate_inode_pages_final(&inode->i_data);

 	if (!inode->i_nlink) {
 		inode->i_size = 0;
 		affs_truncate(inode);
 	}

 	invalidate_inode_buffers(inode);
 	clear_inode(inode);
 	affs_free_prealloc(inode);
 	cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 	if (cache_page) {
 		pr_debug("freeing ext cache\n");
 		AFFS_I(inode)->i_lc = NULL;
 		AFFS_I(inode)->i_ac = NULL;
 		free_page(cache_page);
 	}
 	affs_brelse(AFFS_I(inode)->i_ext_bh);
 	AFFS_I(inode)->i_ext_last = ~1;
 	AFFS_I(inode)->i_ext_bh = NULL;

 	if (!inode->i_nlink)
 		affs_free_block(inode->i_sb, inode->i_ino);
 }

 struct inode *
 affs_new_inode(struct inode *dir)
 {
 	struct super_block	*sb = dir->i_sb;
 	struct inode		*inode;
 	u32			 block;
 	struct buffer_head	*bh;

 	if (!(inode = new_inode(sb)))
 		goto err_inode;

 	if (!(block = affs_alloc_block(dir, dir->i_ino)))
 		goto err_block;

 	bh = affs_getzeroblk(sb, block);
 	if (!bh)
 		goto err_bh;
 	mark_buffer_dirty_inode(bh, inode);
 	affs_brelse(bh);

 	inode->i_uid     = current_fsuid();
 	inode->i_gid     = current_fsgid();
 	inode->i_ino     = block;
 	set_nlink(inode, 1);
 	inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 	AFFS_I(inode)->i_blkcnt = 0;
 	AFFS_I(inode)->i_lc = NULL;
 	AFFS_I(inode)->i_lc_size = 0;
 	AFFS_I(inode)->i_lc_shift = 0;
 	AFFS_I(inode)->i_lc_mask = 0;
 	AFFS_I(inode)->i_ac = NULL;
 	AFFS_I(inode)->i_ext_bh = NULL;
 	AFFS_I(inode)->mmu_private = 0;
 	AFFS_I(inode)->i_protect = 0;
 	AFFS_I(inode)->i_lastalloc = 0;
 	AFFS_I(inode)->i_pa_cnt = 0;
 	AFFS_I(inode)->i_extcnt = 1;
 	AFFS_I(inode)->i_ext_last = ~1;

 	insert_inode_hash(inode);

 	return inode;

 err_bh:
 	affs_free_block(sb, block);
 err_block:
 	iput(inode);
 err_inode:
 	return NULL;
 }

 /*
  * Add an entry to a directory. Create the header block
  * and insert it into the hash table.
  */

 int
 affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 {
 	struct super_block *sb = dir->i_sb;
 	struct buffer_head *inode_bh = NULL;
 	struct buffer_head *bh = NULL;
 	u32 block = 0;
 	int retval;

 	pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
 		 dir->i_ino, inode->i_ino, dentry, type);

 	retval = -EIO;
 	bh = affs_bread(sb, inode->i_ino);
 	if (!bh)
 		goto done;

 	affs_lock_link(inode);
 	switch (type) {
 	case ST_LINKFILE:
 	case ST_LINKDIR:
 		retval = -ENOSPC;
 		block = affs_alloc_block(dir, dir->i_ino);
 		if (!block)
 			goto err;
 		retval = -EIO;
 		inode_bh = bh;
 		bh = affs_getzeroblk(sb, block);
 		if (!bh)
 			goto err;
 		break;
 	default:
 		break;
 	}

 	AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 	AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 	affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 	AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 	AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);

 	if (inode_bh) {
 		__be32 chain;
 	       	chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 		AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 		AFFS_TAIL(sb, bh)->link_chain = chain;
 		AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 		affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 		mark_buffer_dirty_inode(inode_bh, inode);
 		set_nlink(inode, 2);
 		ihold(inode);
 	}
 	affs_fix_checksum(sb, bh);
 	mark_buffer_dirty_inode(bh, inode);
 	dentry->d_fsdata = (void *)(long)bh->b_blocknr;

 	affs_lock_dir(dir);
 	retval = affs_insert_hash(dir, bh);
 	mark_buffer_dirty_inode(bh, inode);
 	affs_unlock_dir(dir);
 	affs_unlock_link(inode);

 	d_instantiate(dentry, inode);
 done:
 	affs_brelse(inode_bh);
 	affs_brelse(bh);
 	return retval;
 err:
 	if (block)
 		affs_free_block(sb, block);
 	affs_unlock_link(inode);
 	goto done;
 }
	/*
	* linux/fs/affs/inode.c
	*
	* (c) 1996 Hans-Joachim Widmaier - Rewritten
	*
	* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
	*
	* (C) 1992 Eric Youngdale Modified for ISO9660 filesystem.
	*
	* (C) 1991 Linus Torvalds - minix filesystem
	*/
	#include <linux/sched.h>
	#include <linux/gfp.h>
	#include "affs.h"

	struct inode affs_iget(struct super_block sb, unsigned long ino)
	{
	struct affs_sb_info *sbi = AFFS_SB(sb);
	struct buffer_head *bh;
	struct affs_tail *tail;
	struct inode *inode;
	u32 block;
	u32 size;
	u32 prot;
	u16 id;

	inode = iget_locked(sb, ino);
	if (!inode)
	return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
	return inode;

	pr_debug("affs_iget(%lu)\n", inode->i_ino);

	block = inode->i_ino;
	bh = affs_bread(sb, block);
	if (!bh) {
	affs_warning(sb, "read_inode", "Cannot read block %d", block);
	goto bad_inode;
	}
	if (affs_checksum_block(sb, bh) \|\| be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
	affs_warning(sb,"read_inode",
	"Checksum or type (ptype=%d) error on inode %d",
	AFFS_HEAD(bh)->ptype, block);
	goto bad_inode;
	}

	tail = AFFS_TAIL(sb, bh);
	prot = be32_to_cpu(tail->protect);

	inode->i_size = 0;
	set_nlink(inode, 1);
	inode->i_mode = 0;
	AFFS_I(inode)->i_extcnt = 1;
	AFFS_I(inode)->i_ext_last = ~1;
	AFFS_I(inode)->i_protect = prot;
	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
	AFFS_I(inode)->i_blkcnt = 0;
	AFFS_I(inode)->i_lc = NULL;
	AFFS_I(inode)->i_lc_size = 0;
	AFFS_I(inode)->i_lc_shift = 0;
	AFFS_I(inode)->i_lc_mask = 0;
	AFFS_I(inode)->i_ac = NULL;
	AFFS_I(inode)->i_ext_bh = NULL;
	AFFS_I(inode)->mmu_private = 0;
	AFFS_I(inode)->i_lastalloc = 0;
	AFFS_I(inode)->i_pa_cnt = 0;

	if (sbi->s_flags & AFFS_MOUNT_SF_SETMODE)
	inode->i_mode = sbi->s_mode;
	else
	inode->i_mode = prot_to_mode(prot);

	id = be16_to_cpu(tail->uid);
	if (id == 0 \|\| sbi->s_flags & AFFS_MOUNT_SF_SETUID)
	inode->i_uid = sbi->s_uid;
	else if (id == 0xFFFF && sbi->s_flags & AFFS_MOUNT_SF_MUFS)
	i_uid_write(inode, 0);
	else
	i_uid_write(inode, id);

	id = be16_to_cpu(tail->gid);
	if (id == 0 \|\| sbi->s_flags & AFFS_MOUNT_SF_SETGID)
	inode->i_gid = sbi->s_gid;
	else if (id == 0xFFFF && sbi->s_flags & AFFS_MOUNT_SF_MUFS)
	i_gid_write(inode, 0);
	else
	i_gid_write(inode, id);

	switch (be32_to_cpu(tail->stype)) {
	case ST_ROOT:
	inode->i_uid = sbi->s_uid;
	inode->i_gid = sbi->s_gid;
	/* fall through */
	case ST_USERDIR:
	if (be32_to_cpu(tail->stype) == ST_USERDIR \|\|
	sbi->s_flags & AFFS_MOUNT_SF_SETMODE) {
	if (inode->i_mode & S_IRUSR)
	inode->i_mode \|= S_IXUSR;
	if (inode->i_mode & S_IRGRP)
	inode->i_mode \|= S_IXGRP;
	if (inode->i_mode & S_IROTH)
	inode->i_mode \|= S_IXOTH;
	inode->i_mode \|= S_IFDIR;
	} else
	inode->i_mode = S_IRUGO \| S_IXUGO \| S_IWUSR \| S_IFDIR;
	/* Maybe it should be controlled by mount parameter? */
	//inode->i_mode \|= S_ISVTX;
	inode->i_op = &affs_dir_inode_operations;
	inode->i_fop = &affs_dir_operations;
	break;
	case ST_LINKDIR:
	#if 0
	affs_warning(sb, "read_inode", "inode is LINKDIR");
	goto bad_inode;
	#else
	inode->i_mode \|= S_IFDIR;
	/* ... and leave ->i_op and ->i_fop pointing to empty */
	break;
	#endif
	case ST_LINKFILE:
	affs_warning(sb, "read_inode", "inode is LINKFILE");
	goto bad_inode;
	case ST_FILE:
	size = be32_to_cpu(tail->size);
	inode->i_mode \|= S_IFREG;
	AFFS_I(inode)->mmu_private = inode->i_size = size;
	if (inode->i_size) {
	AFFS_I(inode)->i_blkcnt = (size - 1) /
	sbi->s_data_blksize + 1;
	AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
	sbi->s_hashsize + 1;
	}
	if (tail->link_chain)
	set_nlink(inode, 2);
	inode->i_mapping->a_ops = (sbi->s_flags & AFFS_MOUNT_SF_OFS) ?
	&affs_aops_ofs : &affs_aops;
	inode->i_op = &affs_file_inode_operations;
	inode->i_fop = &affs_file_operations;
	break;
	case ST_SOFTLINK:
	inode->i_mode \|= S_IFLNK;
	inode->i_op = &affs_symlink_inode_operations;
	inode->i_data.a_ops = &affs_symlink_aops;
	break;
	}

	inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
	= (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
	be32_to_cpu(tail->change.mins) * 60 +
	be32_to_cpu(tail->change.ticks) / 50 +
	((8 * 365 + 2) * 24 * 60 * 60)) +
	sys_tz.tz_minuteswest * 60;
	inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
	affs_brelse(bh);
	unlock_new_inode(inode);
	return inode;

	bad_inode:
	affs_brelse(bh);
	iget_failed(inode);
	return ERR_PTR(-EIO);
	}

	int
	affs_write_inode(struct inode inode, struct writeback_control wbc)
	{
	struct super_block *sb = inode->i_sb;
	struct buffer_head *bh;
	struct affs_tail *tail;
	uid_t uid;
	gid_t gid;

	pr_debug("write_inode(%lu)\n", inode->i_ino);

	if (!inode->i_nlink)
	// possibly free block
	return 0;
	bh = affs_bread(sb, inode->i_ino);
	if (!bh) {
	affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
	return -EIO;
	}
	tail = AFFS_TAIL(sb, bh);
	if (tail->stype == cpu_to_be32(ST_ROOT)) {
	secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
	} else {
	tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
	tail->size = cpu_to_be32(inode->i_size);
	secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
	if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
	uid = i_uid_read(inode);
	gid = i_gid_read(inode);
	if (AFFS_SB(sb)->s_flags & AFFS_MOUNT_SF_MUFS) {
	if (uid == 0 \|\| uid == 0xFFFF)
	uid = uid ^ ~0;
	if (gid == 0 \|\| gid == 0xFFFF)
	gid = gid ^ ~0;
	}
	if (!(AFFS_SB(sb)->s_flags & AFFS_MOUNT_SF_SETUID))
	tail->uid = cpu_to_be16(uid);
	if (!(AFFS_SB(sb)->s_flags & AFFS_MOUNT_SF_SETGID))
	tail->gid = cpu_to_be16(gid);
	}
	}
	affs_fix_checksum(sb, bh);
	mark_buffer_dirty_inode(bh, inode);
	affs_brelse(bh);
	affs_free_prealloc(inode);
	return 0;
	}

	int
	affs_notify_change(struct dentry dentry, struct iattr attr)
	{
	struct inode *inode = dentry->d_inode;
	int error;

	pr_debug("notify_change(%lu,0x%x)\n", inode->i_ino, attr->ia_valid);

	error = inode_change_ok(inode,attr);
	if (error)
	goto out;

	if (((attr->ia_valid & ATTR_UID) &&
	(AFFS_SB(inode->i_sb)->s_flags & AFFS_MOUNT_SF_SETUID)) \|\|
	((attr->ia_valid & ATTR_GID) &&
	(AFFS_SB(inode->i_sb)->s_flags & AFFS_MOUNT_SF_SETGID)) \|\|
	((attr->ia_valid & ATTR_MODE) &&
	(AFFS_SB(inode->i_sb)->s_flags &
	(AFFS_MOUNT_SF_SETMODE \| AFFS_MOUNT_SF_IMMUTABLE)))) {
	if (!(AFFS_SB(inode->i_sb)->s_flags & AFFS_MOUNT_SF_QUIET))
	error = -EPERM;
	goto out;
	}

	if ((attr->ia_valid & ATTR_SIZE) &&
	attr->ia_size != i_size_read(inode)) {
	error = inode_newsize_ok(inode, attr->ia_size);
	if (error)
	return error;

	truncate_setsize(inode, attr->ia_size);
	affs_truncate(inode);
	}

	setattr_copy(inode, attr);
	mark_inode_dirty(inode);

	if (attr->ia_valid & ATTR_MODE)
	mode_to_prot(inode);
	out:
	return error;
	}

	void
	affs_evict_inode(struct inode *inode)
	{
	unsigned long cache_page;
	pr_debug("evict_inode(ino=%lu, nlink=%u)\n",
	inode->i_ino, inode->i_nlink);
	truncate_inode_pages_final(&inode->i_data);

	if (!inode->i_nlink) {
	inode->i_size = 0;
	affs_truncate(inode);
	}

	invalidate_inode_buffers(inode);
	clear_inode(inode);
	affs_free_prealloc(inode);
	cache_page = (unsigned long)AFFS_I(inode)->i_lc;
	if (cache_page) {
	pr_debug("freeing ext cache\n");
	AFFS_I(inode)->i_lc = NULL;
	AFFS_I(inode)->i_ac = NULL;
	free_page(cache_page);
	}
	affs_brelse(AFFS_I(inode)->i_ext_bh);
	AFFS_I(inode)->i_ext_last = ~1;
	AFFS_I(inode)->i_ext_bh = NULL;

	if (!inode->i_nlink)
	affs_free_block(inode->i_sb, inode->i_ino);
	}

	struct inode *
	affs_new_inode(struct inode *dir)
	{
	struct super_block *sb = dir->i_sb;
	struct inode *inode;
	u32 block;
	struct buffer_head *bh;

	if (!(inode = new_inode(sb)))
	goto err_inode;

	if (!(block = affs_alloc_block(dir, dir->i_ino)))
	goto err_block;

	bh = affs_getzeroblk(sb, block);
	if (!bh)
	goto err_bh;
	mark_buffer_dirty_inode(bh, inode);
	affs_brelse(bh);

	inode->i_uid = current_fsuid();
	inode->i_gid = current_fsgid();
	inode->i_ino = block;
	set_nlink(inode, 1);
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
	atomic_set(&AFFS_I(inode)->i_opencnt, 0);
	AFFS_I(inode)->i_blkcnt = 0;
	AFFS_I(inode)->i_lc = NULL;
	AFFS_I(inode)->i_lc_size = 0;
	AFFS_I(inode)->i_lc_shift = 0;
	AFFS_I(inode)->i_lc_mask = 0;
	AFFS_I(inode)->i_ac = NULL;
	AFFS_I(inode)->i_ext_bh = NULL;
	AFFS_I(inode)->mmu_private = 0;
	AFFS_I(inode)->i_protect = 0;
	AFFS_I(inode)->i_lastalloc = 0;
	AFFS_I(inode)->i_pa_cnt = 0;
	AFFS_I(inode)->i_extcnt = 1;
	AFFS_I(inode)->i_ext_last = ~1;

	insert_inode_hash(inode);

	return inode;

	err_bh:
	affs_free_block(sb, block);
	err_block:
	iput(inode);
	err_inode:
	return NULL;
	}

	/*
	* Add an entry to a directory. Create the header block
	* and insert it into the hash table.
	*/

	int
	affs_add_entry(struct inode dir, struct inode inode, struct dentry *dentry, s32 type)
	{
	struct super_block *sb = dir->i_sb;
	struct buffer_head *inode_bh = NULL;
	struct buffer_head *bh = NULL;
	u32 block = 0;
	int retval;

	pr_debug("%s(dir=%lu, inode=%lu, \"%pd\", type=%d)\n", __func__,
	dir->i_ino, inode->i_ino, dentry, type);

	retval = -EIO;
	bh = affs_bread(sb, inode->i_ino);
	if (!bh)
	goto done;

	affs_lock_link(inode);
	switch (type) {
	case ST_LINKFILE:
	case ST_LINKDIR:
	retval = -ENOSPC;
	block = affs_alloc_block(dir, dir->i_ino);
	if (!block)
	goto err;
	retval = -EIO;
	inode_bh = bh;
	bh = affs_getzeroblk(sb, block);
	if (!bh)
	goto err;
	break;
	default:
	break;
	}

	AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
	AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
	affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
	AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
	AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);

	if (inode_bh) {
	__be32 chain;
	chain = AFFS_TAIL(sb, inode_bh)->link_chain;
	AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
	AFFS_TAIL(sb, bh)->link_chain = chain;
	AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
	affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
	mark_buffer_dirty_inode(inode_bh, inode);
	set_nlink(inode, 2);
	ihold(inode);
	}
	affs_fix_checksum(sb, bh);
	mark_buffer_dirty_inode(bh, inode);
	dentry->d_fsdata = (void *)(long)bh->b_blocknr;

	affs_lock_dir(dir);
	retval = affs_insert_hash(dir, bh);
	mark_buffer_dirty_inode(bh, inode);
	affs_unlock_dir(dir);
	affs_unlock_link(inode);

	d_instantiate(dentry, inode);
	done:
	affs_brelse(inode_bh);
	affs_brelse(bh);
	return retval;
	err:
	if (block)
	affs_free_block(sb, block);
	affs_unlock_link(inode);
	goto done;
	}