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ufs proper handling of zero link case

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This patch should fix or partly fix this bug:
http://bugzilla.kernel.org/show_bug.cgi?id=8276

The problem is:

- if we see "zero link case" during reading inode operation, we call
  ufs_error(which remount fs readonly), but not "mark" inode as bad (1)

- in readonly case we do not fill some data structures, which are used in
  read and write case (2)

- VFS call ufs_delete_inode if link count is zero (3)

so (1)->(3)->(2) cause oops, this patch should fix such scenario

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Cc: Jim Paris <jim@jtan.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Evgeniy Dushistov 2007-04-16 22:53:24 -07:00 committed by Linus Torvalds
parent 3d2c5b415c
commit 07a0cfec30
1 changed files with 22 additions and 7 deletions
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29
fs/ufs/inode.c
View file

@ -601,7 +601,7 @@ static void ufs_set_inode_ops(struct inode *inode)
ufs_get_inode_dev(inode->i_sb, UFS_I(inode)));
}
static void ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
static int ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
{
struct ufs_inode_info *ufsi = UFS_I(inode);
struct super_block *sb = inode->i_sb;
@ -613,8 +613,10 @@ static void ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
*/
inode->i_mode = mode = fs16_to_cpu(sb, ufs_inode->ui_mode);
inode->i_nlink = fs16_to_cpu(sb, ufs_inode->ui_nlink);
if (inode->i_nlink == 0)
if (inode->i_nlink == 0) {
ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
return -1;
}
/*
* Linux now has 32-bit uid and gid, so we can support EFT.
@ -643,9 +645,10 @@ static void ufs1_read_inode(struct inode *inode, struct ufs_inode *ufs_inode)
for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
ufsi->i_u1.i_symlink[i] = ufs_inode->ui_u2.ui_symlink[i];
}
return 0;
}
static void ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
{
struct ufs_inode_info *ufsi = UFS_I(inode);
struct super_block *sb = inode->i_sb;
@ -658,8 +661,10 @@ static void ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
*/
inode->i_mode = mode = fs16_to_cpu(sb, ufs2_inode->ui_mode);
inode->i_nlink = fs16_to_cpu(sb, ufs2_inode->ui_nlink);
if (inode->i_nlink == 0)
if (inode->i_nlink == 0) {
ufs_error (sb, "ufs_read_inode", "inode %lu has zero nlink\n", inode->i_ino);
return -1;
}
/*
* Linux now has 32-bit uid and gid, so we can support EFT.
@ -690,6 +695,7 @@ static void ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
for (i = 0; i < (UFS_NDADDR + UFS_NINDIR) * 4; i++)
ufsi->i_u1.i_symlink[i] = ufs2_inode->ui_u2.ui_symlink[i];
}
return 0;
}
void ufs_read_inode(struct inode * inode)
@ -698,6 +704,7 @@ void ufs_read_inode(struct inode * inode)
struct super_block * sb;
struct ufs_sb_private_info * uspi;
struct buffer_head * bh;
int err;
UFSD("ENTER, ino %lu\n", inode->i_ino);
@ -720,14 +727,17 @@ void ufs_read_inode(struct inode * inode)
if ((UFS_SB(sb)->s_flags & UFS_TYPE_MASK) == UFS_TYPE_UFS2) {
struct ufs2_inode *ufs2_inode = (struct ufs2_inode *)bh->b_data;
ufs2_read_inode(inode,
ufs2_inode + ufs_inotofsbo(inode->i_ino));
err = ufs2_read_inode(inode,
ufs2_inode + ufs_inotofsbo(inode->i_ino));
} else {
struct ufs_inode *ufs_inode = (struct ufs_inode *)bh->b_data;
ufs1_read_inode(inode, ufs_inode + ufs_inotofsbo(inode->i_ino));
err = ufs1_read_inode(inode,
ufs_inode + ufs_inotofsbo(inode->i_ino));
}
if (err)
goto bad_inode;
inode->i_version++;
ufsi->i_lastfrag =
(inode->i_size + uspi->s_fsize - 1) >> uspi->s_fshift;
@ -888,6 +898,8 @@ void ufs_delete_inode (struct inode * inode)
loff_t old_i_size;
truncate_inode_pages(&inode->i_data, 0);
if (is_bad_inode(inode))
goto no_delete;
/*UFS_I(inode)->i_dtime = CURRENT_TIME;*/
lock_kernel();
mark_inode_dirty(inode);
@ -898,4 +910,7 @@ void ufs_delete_inode (struct inode * inode)
ufs_warning(inode->i_sb, __FUNCTION__, "ufs_truncate failed\n");
ufs_free_inode (inode);
unlock_kernel();
return;
no_delete:
clear_inode(inode); /* We must guarantee clearing of inode... */
}