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xfs: make attr removal an explicit operation

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Parent pointers match attrs on name+value, unlike everything else which
matches on only the name.  Therefore, we cannot keep using the heuristic
that !value means remove.  Make this an explicit operation code.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2024-04-22 09:47:22 -07:00
parent 54275d8496
commit c27411d4c6
6 changed files with 34 additions and 25 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
fs/xfs/libxfs/xfs_attr.c
View file

@ -916,10 +916,6 @@ xfs_attr_defer_add(
trace_xfs_attr_defer_add(new->xattri_dela_state, args->dp);
}
/*
* Note: If args->value is NULL the attribute will be removed, just like the
* Linux ->setattr API.
*/
int
xfs_attr_set(
struct xfs_da_args *args,
@ -955,7 +951,10 @@ xfs_attr_set(
args->op_flags = XFS_DA_OP_OKNOENT |
(args->op_flags & XFS_DA_OP_LOGGED);
if (args->value) {
switch (op) {
case XFS_ATTRUPDATE_UPSERT:
case XFS_ATTRUPDATE_CREATE:
case XFS_ATTRUPDATE_REPLACE:
XFS_STATS_INC(mp, xs_attr_set);
args->total = xfs_attr_calc_size(args, &local);
@ -975,9 +974,11 @@ xfs_attr_set(
if (!local)
rmt_blks = xfs_attr3_rmt_blocks(mp, args->valuelen);
} else {
break;
case XFS_ATTRUPDATE_REMOVE:
XFS_STATS_INC(mp, xs_attr_remove);
rmt_blks = xfs_attr3_rmt_blocks(mp, XFS_XATTR_SIZE_MAX);
break;
}
/*
@ -989,7 +990,7 @@ xfs_attr_set(
if (error)
return error;
if (args->value || xfs_inode_hasattr(dp)) {
if (op != XFS_ATTRUPDATE_REMOVE || xfs_inode_hasattr(dp)) {
error = xfs_iext_count_may_overflow(dp, XFS_ATTR_FORK,
XFS_IEXT_ATTR_MANIP_CNT(rmt_blks));
if (error == -EFBIG)
@ -1002,7 +1003,7 @@ xfs_attr_set(
error = xfs_attr_lookup(args);
switch (error) {
case -EEXIST:
if (!args->value) {
if (op == XFS_ATTRUPDATE_REMOVE) {
/* if no value, we are performing a remove operation */
xfs_attr_defer_add(args, XFS_ATTRI_OP_FLAGS_REMOVE);
break;
@ -1015,7 +1016,7 @@ xfs_attr_set(
break;
case -ENOATTR:
/* Can't remove what isn't there. */
if (!args->value)
if (op == XFS_ATTRUPDATE_REMOVE)
goto out_trans_cancel;
/* Pure replace fails if no existing attr to replace. */

3
fs/xfs/libxfs/xfs_attr.h
View file

@ -546,7 +546,8 @@ int xfs_attr_get_ilocked(struct xfs_da_args *args);
int xfs_attr_get(struct xfs_da_args *args);
enum xfs_attr_update {
XFS_ATTRUPDATE_UPSERTR, /* set/remove value, replace any existing attr */
XFS_ATTRUPDATE_REMOVE, /* remove attr */
XFS_ATTRUPDATE_UPSERT, /* set value, replace any existing attr */
XFS_ATTRUPDATE_CREATE, /* set value, fail if attr already exists */
XFS_ATTRUPDATE_REPLACE, /* set value, fail if attr does not exist */
};

17
fs/xfs/xfs_acl.c
View file

@ -201,16 +201,17 @@ __xfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
if (!args.value)
return -ENOMEM;
xfs_acl_to_disk(args.value, acl);
error = xfs_attr_change(&args, XFS_ATTRUPDATE_UPSERT);
kvfree(args.value);
} else {
error = xfs_attr_change(&args, XFS_ATTRUPDATE_REMOVE);
/*
* If the attribute didn't exist to start with that's fine.
*/
if (error == -ENOATTR)
error = 0;
}
error = xfs_attr_change(&args, XFS_ATTRUPDATE_UPSERTR);
kvfree(args.value);
/*
* If the attribute didn't exist to start with that's fine.
*/
if (!acl && error == -ENOATTR)
error = 0;
if (!error)
set_cached_acl(inode, type, acl);
return error;

9
fs/xfs/xfs_ioctl.c
View file

@ -363,13 +363,16 @@ xfs_attr_filter(
static inline enum xfs_attr_update
xfs_xattr_flags(
u32 ioc_flags)
u32 ioc_flags,
void *value)
{
if (!value)
return XFS_ATTRUPDATE_REMOVE;
if (ioc_flags & XFS_IOC_ATTR_CREATE)
return XFS_ATTRUPDATE_CREATE;
if (ioc_flags & XFS_IOC_ATTR_REPLACE)
return XFS_ATTRUPDATE_REPLACE;
return XFS_ATTRUPDATE_UPSERTR;
return XFS_ATTRUPDATE_UPSERT;
}
int
@ -526,7 +529,7 @@ xfs_attrmulti_attr_set(
args.valuelen = len;
}
error = xfs_attr_change(&args, xfs_xattr_flags(flags));
error = xfs_attr_change(&args, xfs_xattr_flags(flags, args.value));
if (!error && (flags & XFS_IOC_ATTR_ROOT))
xfs_forget_acl(inode, name);
kfree(args.value);

2
fs/xfs/xfs_iops.c
View file

@ -63,7 +63,7 @@ xfs_initxattrs(
.value = xattr->value,
.valuelen = xattr->value_len,
};
error = xfs_attr_change(&args, XFS_ATTRUPDATE_UPSERTR);
error = xfs_attr_change(&args, XFS_ATTRUPDATE_UPSERT);
if (error < 0)
break;
}

9
fs/xfs/xfs_xattr.c
View file

@ -118,13 +118,16 @@ xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused,
static inline enum xfs_attr_update
xfs_xattr_flags_to_op(
int flags)
int flags,
const void *value)
{
if (!value)
return XFS_ATTRUPDATE_REMOVE;
if (flags & XATTR_CREATE)
return XFS_ATTRUPDATE_CREATE;
if (flags & XATTR_REPLACE)
return XFS_ATTRUPDATE_REPLACE;
return XFS_ATTRUPDATE_UPSERTR;
return XFS_ATTRUPDATE_UPSERT;
}
static int
@ -143,7 +146,7 @@ xfs_xattr_set(const struct xattr_handler *handler,
};
int error;
error = xfs_attr_change(&args, xfs_xattr_flags_to_op(flags));
error = xfs_attr_change(&args, xfs_xattr_flags_to_op(flags, value));
if (!error && (handler->flags & XFS_ATTR_ROOT))
xfs_forget_acl(inode, name);
return error;