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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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8
fs/ufs/util.h
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@@ -251,6 +251,14 @@ extern void _ubh_ubhcpymem_(struct ufs_sb_private_info *, unsigned char *, struc
#define ubh_memcpyubh(ubh,mem,size) _ubh_memcpyubh_(uspi,ubh,mem,size)
extern void _ubh_memcpyubh_(struct ufs_sb_private_info *, struct ufs_buffer_head *, unsigned char *, unsigned);
/* This functions works with cache pages*/
extern struct page *ufs_get_locked_page(struct address_space *mapping,
pgoff_t index);
static inline void ufs_put_locked_page(struct page *page)
{
unlock_page(page);
page_cache_release(page);
}
/*