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[PATCH] ufs: truncate should allocate block for last byte

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This patch fixes buggy behaviour of UFS
in such kind of scenario:
open(, O_TRUNC...)
ftruncate(, 1024)
ftruncate(, 0)

Such a scenario causes ufs_panic and remount read-only.  This happen
because of according to specification UFS should always allocate block for
last byte, and many parts of our implementation rely on this, but
`ufs_truncate' doesn't care about this.

To make possible return error code and to know about old size, this patch
removes `truncate' from ufs inode_operations and uses `setattr' method to
call ufs_truncate.

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Evgeniy Dushistov
2006-07-01 04:36:24 -07:00
committed by Linus Torvalds
parent eb28931e4a
commit 10e5dce07e
7 changed files with 205 additions and 66 deletions
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2
include/linux/ufs_fs.h
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@@ -993,7 +993,7 @@ extern void ufs_panic (struct super_block *, const char *, const char *, ...) __
extern struct inode_operations ufs_fast_symlink_inode_operations;
/* truncate.c */
extern void ufs_truncate (struct inode *);
extern int ufs_truncate (struct inode *, loff_t);
static inline struct ufs_sb_info *UFS_SB(struct super_block *sb)
{