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xfs: make attr lookup returns consistent

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Shortform, leaf and remote value attr value retrieval return
different values for success. This makes it more complex to handle
actual errors xfs_attr_get() as some errors mean success and some
mean failure. Make the return values consistent for success and
failure consistent for all attribute formats.

Signed-off-by: Dave Chinner <dchinner@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:
Dave Chinner
2019-08-29 09:04:08 -07:00
committed by Darrick J. Wong
parent 756c6f0f7e
commit 728bcaa3e0
4 changed files with 48 additions and 26 deletions
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55
fs/xfs/libxfs/xfs_attr.c
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@@ -97,7 +97,10 @@ xfs_inode_hasattr(
* Overall external interface routines.
*========================================================================*/
/* Retrieve an extended attribute and its value. Must have ilock. */
/*
* Retrieve an extended attribute and its value. Must have ilock.
* Returns 0 on successful retrieval, otherwise an error.
*/
int
xfs_attr_get_ilocked(
struct xfs_inode *ip,
@@ -147,7 +150,7 @@ xfs_attr_get(
xfs_iunlock(ip, lock_mode);
*valuelenp = args.valuelen;
return error == -EEXIST ? 0 : error;
return error;
}
/*
@@ -768,6 +771,8 @@ xfs_attr_leaf_removename(
*
* This leaf block cannot have a "remote" value, we only call this routine
* if bmap_one_block() says there is only one block (ie: no remote blks).
*
* Returns 0 on successful retrieval, otherwise an error.
*/
STATIC int
xfs_attr_leaf_get(xfs_da_args_t *args)
@@ -789,10 +794,15 @@ xfs_attr_leaf_get(xfs_da_args_t *args)
}
error = xfs_attr3_leaf_getvalue(bp, args);
xfs_trans_brelse(args->trans, bp);
if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
error = xfs_attr_rmtval_get(args);
}
return error;
if (error)
return error;
/* check if we have to retrieve a remote attribute to get the value */
if (args->flags & ATTR_KERNOVAL)
return 0;
if (!args->rmtblkno)
return 0;
return xfs_attr_rmtval_get(args);
}
/*========================================================================
@@ -1268,11 +1278,13 @@ xfs_attr_refillstate(xfs_da_state_t *state)
}
/*
* Look up a filename in a node attribute list.
* Retrieve the attribute data from a node attribute list.
*
* This routine gets called for any attribute fork that has more than one
* block, ie: both true Btree attr lists and for single-leaf-blocks with
* "remote" values taking up more blocks.
*
* Returns 0 on successful retrieval, otherwise an error.
*/
STATIC int
xfs_attr_node_get(xfs_da_args_t *args)
@@ -1294,24 +1306,27 @@ xfs_attr_node_get(xfs_da_args_t *args)
error = xfs_da3_node_lookup_int(state, &retval);
if (error) {
retval = error;
} else if (retval == -EEXIST) {
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->bp != NULL);
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
/*
* Get the value, local or "remote"
*/
retval = xfs_attr3_leaf_getvalue(blk->bp, args);
if (!retval && (args->rmtblkno > 0)
&& !(args->flags & ATTR_KERNOVAL)) {
retval = xfs_attr_rmtval_get(args);
}
goto out_release;
}
if (retval != -EEXIST)
goto out_release;
/*
* Get the value, local or "remote"
*/
blk = &state->path.blk[state->path.active - 1];
retval = xfs_attr3_leaf_getvalue(blk->bp, args);
if (retval)
goto out_release;
if (args->flags & ATTR_KERNOVAL)
goto out_release;
if (args->rmtblkno > 0)
retval = xfs_attr_rmtval_get(args);
/*
* If not in a transaction, we have to release all the buffers.
*/
out_release:
for (i = 0; i < state->path.active; i++) {
xfs_trans_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;