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xfs: rename XFS_IGET_BULKSTAT to XFS_IGET_UNTRUSTED 

Inode numbers may come from somewhere external to the filesystem
(e.g. file handles, bulkstat information) and so are inherently
untrusted. Rename the flag we use for these lookups to make it
obvious we are doing a lookup of an untrusted inode number and need
to verify it completely before trying to read it from disk.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner 2010-06-24 11:15:47 +10:00 committed by Dave Chinner
parent 7124fe0a5b
commit 1920779e67
5 changed files with 14 additions and 12 deletions
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9
fs/xfs/linux-2.6/xfs_export.c
View File

@ -128,12 +128,11 @@ xfs_nfs_get_inode(
return ERR_PTR(-ESTALE);
/*
* The XFS_IGET_BULKSTAT means that an invalid inode number is just
* fine and not an indication of a corrupted filesystem. Because
* clients can send any kind of invalid file handle, e.g. after
* a restore on the server we have to deal with this case gracefully.
* The XFS_IGET_UNTRUSTED means that an invalid inode number is just
* fine and not an indication of a corrupted filesystem as clients can
* send invalid file handles and we have to handle it gracefully..
*/
error = xfs_iget(mp, NULL, ino, XFS_IGET_BULKSTAT,
error = xfs_iget(mp, NULL, ino, XFS_IGET_UNTRUSTED,
XFS_ILOCK_SHARED, &ip, 0);
if (error) {
/*

11
fs/xfs/xfs_ialloc.c
View File

@ -1251,7 +1251,7 @@ xfs_imap_lookup(
return error;
/* for untrusted inodes check it is allocated first */
if ((flags & XFS_IGET_BULKSTAT) &&
if ((flags & XFS_IGET_UNTRUSTED) &&
(rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino)))
return EINVAL;
@ -1292,8 +1292,11 @@ xfs_imap(
if (agno >= mp->m_sb.sb_agcount || agbno >= mp->m_sb.sb_agblocks ||
ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
#ifdef DEBUG
/* no diagnostics for bulkstat, ino comes from userspace */
if (flags & XFS_IGET_BULKSTAT)
/*
* Don't output diagnostic information for untrusted inodes
* as they can be invalid without implying corruption.
*/
if (flags & XFS_IGET_UNTRUSTED)
return XFS_ERROR(EINVAL);
if (agno >= mp->m_sb.sb_agcount) {
xfs_fs_cmn_err(CE_ALERT, mp,
@ -1329,7 +1332,7 @@ xfs_imap(
* inodes in stale state on disk. Hence we have to do a btree lookup
* in all cases where an untrusted inode number is passed.
*/
if (flags & XFS_IGET_BULKSTAT) {
if (flags & XFS_IGET_UNTRUSTED) {
error = xfs_imap_lookup(mp, tp, agno, agino, agbno,
&chunk_agbno, &offset_agbno, flags);
if (error)

2
fs/xfs/xfs_inode.c
View File

@ -177,7 +177,7 @@ xfs_imap_to_bp(
if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
XFS_ERRTAG_ITOBP_INOTOBP,
XFS_RANDOM_ITOBP_INOTOBP))) {
if (iget_flags & XFS_IGET_BULKSTAT) {
if (iget_flags & XFS_IGET_UNTRUSTED) {
xfs_trans_brelse(tp, bp);
return XFS_ERROR(EINVAL);
}

2
fs/xfs/xfs_inode.h
View File

@ -500,7 +500,7 @@ do { \
* Flags for xfs_iget()
*/
#define XFS_IGET_CREATE 0x1
#define XFS_IGET_BULKSTAT 0x2
#define XFS_IGET_UNTRUSTED 0x2
int xfs_inotobp(struct xfs_mount *, struct xfs_trans *,
xfs_ino_t, struct xfs_dinode **,

2
fs/xfs/xfs_itable.c
View File

@ -80,7 +80,7 @@ xfs_bulkstat_one_int(
return XFS_ERROR(ENOMEM);
error = xfs_iget(mp, NULL, ino,
XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
XFS_IGET_UNTRUSTED, XFS_ILOCK_SHARED, &ip, bno);
if (error) {
*stat = BULKSTAT_RV_NOTHING;
goto out_free;