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xfs: use ->t_firstblock in xattr ops 

Similar to the dirops code, the xattr code uses an on-stack
firstblock variable for the various operations. This code rolls the
underlying transaction in various places, however, which means we
cannot simply replace the local firstblock vars with ->t_firstblock.
Doing so (without further changes) would invalidate the memory
pointed to by xfs_da_args.firstblock as soon as the first
transaction rolls.

To avoid this problem, remove xfs_da_args.firstblock and replace all
such accesses with ->t_firstblock at the same time. This ensures
that accesses to the current firstblock always occur through the
current transaction rather than a potentially invalid xfs_da_args
pointer.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Brian Foster 2018-07-11 22:26:22 -07:00 committed by Darrick J. Wong
parent 825d75cd8c
commit 766139032f
7 changed files with 33 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
fs/xfs/libxfs/xfs_attr.c
View File

@ -204,7 +204,6 @@ xfs_attr_set(
struct xfs_da_args args;
struct xfs_defer_ops dfops;
struct xfs_trans_res tres;
xfs_fsblock_t firstblock;
int rsvd = (flags & ATTR_ROOT) != 0;
int error, err2, local;
@ -219,7 +218,6 @@ xfs_attr_set(
args.value = value;
args.valuelen = valuelen;
args.firstblock = &firstblock;
args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
args.total = xfs_attr_calc_size(&args, &local);
@ -253,7 +251,7 @@ xfs_attr_set(
rsvd ? XFS_TRANS_RESERVE : 0, &args.trans);
if (error)
return error;
xfs_defer_init(args.trans, &dfops, &firstblock);
xfs_defer_init(args.trans, &dfops, &args.trans->t_firstblock);
xfs_ilock(dp, XFS_ILOCK_EXCL);
error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
@ -392,7 +390,6 @@ xfs_attr_remove(
struct xfs_mount *mp = dp->i_mount;
struct xfs_da_args args;
struct xfs_defer_ops dfops;
xfs_fsblock_t firstblock;
int error;
XFS_STATS_INC(mp, xs_attr_remove);
@ -404,8 +401,6 @@ xfs_attr_remove(
if (error)
return error;
args.firstblock = &firstblock;
/*
* we have no control over the attribute names that userspace passes us
* to remove, so we have to allow the name lookup prior to attribute
@ -427,7 +422,7 @@ xfs_attr_remove(
&args.trans);
if (error)
return error;
xfs_defer_init(args.trans, &dfops, &firstblock);
xfs_defer_init(args.trans, &dfops, &args.trans->t_firstblock);
xfs_ilock(dp, XFS_ILOCK_EXCL);
/*
@ -598,7 +593,8 @@ xfs_attr_leaf_addname(
* Commit that transaction so that the node_addname() call
* can manage its own transactions.
*/
xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_attr3_leaf_to_node(args);
if (error)
goto out_defer_cancel;
@ -687,8 +683,8 @@ xfs_attr_leaf_addname(
* If the result is small enough, shrink it all into the inode.
*/
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
xfs_defer_init(NULL, args->trans->t_dfops,
args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
/* bp is gone due to xfs_da_shrink_inode */
if (error)
@ -753,7 +749,8 @@ xfs_attr_leaf_removename(
* If the result is small enough, shrink it all into the inode.
*/
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
/* bp is gone due to xfs_da_shrink_inode */
if (error)
@ -882,8 +879,8 @@ restart:
*/
xfs_da_state_free(state);
state = NULL;
xfs_defer_init(NULL, args->trans->t_dfops,
args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_attr3_leaf_to_node(args);
if (error)
goto out_defer_cancel;
@ -910,7 +907,8 @@ restart:
* in the index/blkno/rmtblkno/rmtblkcnt fields and
* in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
*/
xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_da3_split(state);
if (error)
goto out_defer_cancel;
@ -1008,8 +1006,8 @@ restart:
* Check to see if the tree needs to be collapsed.
*/
if (retval && (state->path.active > 1)) {
xfs_defer_init(NULL, args->trans->t_dfops,
args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_da3_join(state);
if (error)
goto out_defer_cancel;
@ -1134,7 +1132,8 @@ xfs_attr_node_removename(
* Check to see if the tree needs to be collapsed.
*/
if (retval && (state->path.active > 1)) {
xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_da3_join(state);
if (error)
goto out_defer_cancel;
@ -1166,8 +1165,8 @@ xfs_attr_node_removename(
goto out;
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
xfs_defer_init(NULL, args->trans->t_dfops,
args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
/* bp is gone due to xfs_da_shrink_inode */
if (error)

2
fs/xfs/libxfs/xfs_attr_leaf.c
View File

@ -802,7 +802,6 @@ xfs_attr_shortform_to_leaf(
memset((char *)&nargs, 0, sizeof(nargs));
nargs.dp = dp;
nargs.geo = args->geo;
nargs.firstblock = args->firstblock;
nargs.total = args->total;
nargs.whichfork = XFS_ATTR_FORK;
nargs.trans = args->trans;
@ -1005,7 +1004,6 @@ xfs_attr3_leaf_to_shortform(
memset((char *)&nargs, 0, sizeof(nargs));
nargs.geo = args->geo;
nargs.dp = dp;
nargs.firstblock = args->firstblock;
nargs.total = args->total;
nargs.whichfork = XFS_ATTR_FORK;
nargs.trans = args->trans;

18
fs/xfs/libxfs/xfs_attr_remote.c
View File

@ -480,11 +480,13 @@ xfs_attr_rmtval_set(
* extent and then crash then the block may not contain the
* correct metadata after log recovery occurs.
*/
xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
nmap = 1;
error = xfs_bmapi_write(args->trans, dp, (xfs_fileoff_t)lblkno,
blkcnt, XFS_BMAPI_ATTRFORK, args->firstblock,
args->total, &map, &nmap);
blkcnt, XFS_BMAPI_ATTRFORK,
&args->trans->t_firstblock, args->total, &map,
&nmap);
if (error)
goto out_defer_cancel;
xfs_defer_ijoin(args->trans->t_dfops, dp);
@ -522,7 +524,8 @@ xfs_attr_rmtval_set(
ASSERT(blkcnt > 0);
xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
nmap = 1;
error = xfs_bmapi_read(dp, (xfs_fileoff_t)lblkno,
blkcnt, &map, &nmap,
@ -626,10 +629,11 @@ xfs_attr_rmtval_remove(
blkcnt = args->rmtblkcnt;
done = 0;
while (!done) {
xfs_defer_init(NULL, args->trans->t_dfops, args->firstblock);
xfs_defer_init(args->trans, args->trans->t_dfops,
&args->trans->t_firstblock);
error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
XFS_BMAPI_ATTRFORK, 1, args->firstblock,
&done);
XFS_BMAPI_ATTRFORK, 1,
&args->trans->t_firstblock, &done);
if (error)
goto out_defer_cancel;
xfs_defer_ijoin(args->trans->t_dfops, args->dp);

1
fs/xfs/libxfs/xfs_bmap.c
View File

@ -1000,7 +1000,6 @@ xfs_bmap_add_attrfork_local(
memset(&dargs, 0, sizeof(dargs));
dargs.geo = ip->i_mount->m_dir_geo;
dargs.dp = ip;
dargs.firstblock = &tp->t_firstblock;
dargs.total = dargs.geo->fsbcount;
dargs.whichfork = XFS_DATA_FORK;
dargs.trans = tp;

7
fs/xfs/libxfs/xfs_da_btree.c
View File

@ -2059,10 +2059,9 @@ xfs_da_grow_inode_int(
* Try mapping it in one filesystem block.
*/
nmap = 1;
ASSERT(args->firstblock != NULL);
error = xfs_bmapi_write(tp, dp, *bno, count,
xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA|XFS_BMAPI_CONTIG,
args->firstblock, args->total, &map, &nmap);
&tp->t_firstblock, args->total, &map, &nmap);
if (error)
return error;
@ -2084,7 +2083,7 @@ xfs_da_grow_inode_int(
c = (int)(*bno + count - b);
error = xfs_bmapi_write(tp, dp, b, c,
xfs_bmapi_aflag(w)|XFS_BMAPI_METADATA,
args->firstblock, args->total,
&tp->t_firstblock, args->total,
&mapp[mapi], &nmap);
if (error)
goto out_free_map;
@ -2394,7 +2393,7 @@ xfs_da_shrink_inode(
* the last block to the place we want to kill.
*/
error = xfs_bunmapi(tp, dp, dead_blkno, count,
xfs_bmapi_aflag(w), 0, args->firstblock,
xfs_bmapi_aflag(w), 0, &tp->t_firstblock,
&done);
if (error == -ENOSPC) {
if (w != XFS_DATA_FORK)

1
fs/xfs/libxfs/xfs_da_btree.h
View File

@ -57,7 +57,6 @@ typedef struct xfs_da_args {
xfs_dahash_t hashval; /* hash value of name */
xfs_ino_t inumber; /* input/output inode number */
struct xfs_inode *dp; /* directory inode to manipulate */
xfs_fsblock_t *firstblock; /* ptr to firstblock for bmap calls */
struct xfs_trans *trans; /* current trans (changes over time) */
xfs_extlen_t total; /* total blocks needed, for 1st bmap */
int whichfork; /* data or attribute fork */

5
fs/xfs/libxfs/xfs_dir2.c
View File

@ -272,7 +272,6 @@ xfs_dir_createname(
args->total = total;
args->whichfork = XFS_DATA_FORK;
args->trans = tp;
args->firstblock = &tp->t_firstblock;
args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
if (!inum)
args->op_flags |= XFS_DA_OP_JUSTCHECK;
@ -439,7 +438,6 @@ xfs_dir_removename(
args->hashval = dp->i_mount->m_dirnameops->hashname(name);
args->inumber = ino;
args->dp = dp;
args->firstblock = &tp->t_firstblock;
args->total = total;
args->whichfork = XFS_DATA_FORK;
args->trans = tp;
@ -502,7 +500,6 @@ xfs_dir_replace(
args->hashval = dp->i_mount->m_dirnameops->hashname(name);
args->inumber = inum;
args->dp = dp;
args->firstblock = &tp->t_firstblock;
args->total = total;
args->whichfork = XFS_DATA_FORK;
args->trans = tp;
@ -660,7 +657,7 @@ xfs_dir2_shrink_inode(
/* Unmap the fsblock(s). */
error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0,
args->firstblock, &done);
&tp->t_firstblock, &done);
if (error) {
/*
* ENOSPC actually can happen if we're in a removename with no