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xfs: remove ATTR_ALLOC and XFS_DA_OP_ALLOCVAL

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Use a NULL args->value as the indicator to lazily allocate a buffer
instead, and let the caller always free args->value instead of
duplicating the cleanup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Chandan Rajendra <chandanrlinux@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2020-02-26 17:30:35 -08:00 committed by Darrick J. Wong
parent e513e25c38
commit d49db18b24
5 changed files with 18 additions and 33 deletions
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20
fs/xfs/libxfs/xfs_attr.c
View File

@ -98,15 +98,14 @@ xfs_attr_get_ilocked(
* indication whether the attribute exists and the size of the value if it
* exists. The size is returned in args.valuelen.
*
* If args->value is NULL but args->valuelen is non-zero, allocate the buffer
* for the value after existence of the attribute has been determined. The
* caller always has to free args->value if it is set, no matter if this
* function was successful or not.
*
* If the attribute is found, but exceeds the size limit set by the caller in
* args->valuelen, return -ERANGE with the size of the attribute that was found
* in args->valuelen.
*
* If ATTR_ALLOC is set in args->flags, allocate the buffer for the value after
* existence of the attribute has been determined. On success, return that
* buffer to the caller and leave them to free it. On failure, free any
* allocated buffer and ensure the buffer pointer returned to the caller is
* null.
*/
int
xfs_attr_get(
@ -115,8 +114,6 @@ xfs_attr_get(
uint lock_mode;
int error;
ASSERT((args->flags & ATTR_ALLOC) || !args->valuelen || args->value);
XFS_STATS_INC(args->dp->i_mount, xs_attr_get);
if (XFS_FORCED_SHUTDOWN(args->dp->i_mount))
@ -128,18 +125,11 @@ xfs_attr_get(
/* Entirely possible to look up a name which doesn't exist */
args->op_flags = XFS_DA_OP_OKNOENT;
if (args->flags & ATTR_ALLOC)
args->op_flags |= XFS_DA_OP_ALLOCVAL;
lock_mode = xfs_ilock_attr_map_shared(args->dp);
error = xfs_attr_get_ilocked(args);
xfs_iunlock(args->dp, lock_mode);
/* on error, we have to clean up allocated value buffers */
if (error && (args->flags & ATTR_ALLOC)) {
kmem_free(args->value);
args->value = NULL;
}
return error;
}

7
fs/xfs/libxfs/xfs_attr.h
View File

@ -35,10 +35,8 @@ struct xfs_attr_list_context;
#define ATTR_KERNOTIME 0x1000 /* [kernel] don't update inode timestamps */
#define ATTR_ALLOC 0x8000 /* [kernel] allocate xattr buffer on demand */
#define ATTR_KERNEL_FLAGS \
(ATTR_KERNOTIME | ATTR_ALLOC)
(ATTR_KERNOTIME)
#define XFS_ATTR_FLAGS \
{ ATTR_DONTFOLLOW, "DONTFOLLOW" }, \
@ -47,8 +45,7 @@ struct xfs_attr_list_context;
{ ATTR_SECURE, "SECURE" }, \
{ ATTR_CREATE, "CREATE" }, \
{ ATTR_REPLACE, "REPLACE" }, \
{ ATTR_KERNOTIME, "KERNOTIME" }, \
{ ATTR_ALLOC, "ALLOC" }
{ ATTR_KERNOTIME, "KERNOTIME" }
/*
* The maximum size (into the kernel or returned from the kernel) of an

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

@ -477,7 +477,7 @@ xfs_attr_copy_value(
return -ERANGE;
}
if (args->op_flags & XFS_DA_OP_ALLOCVAL) {
if (!args->value) {
args->value = kmem_alloc_large(valuelen, 0);
if (!args->value)
return -ENOMEM;

2
fs/xfs/libxfs/xfs_da_btree.h
View File

@ -88,7 +88,6 @@ typedef struct xfs_da_args {
#define XFS_DA_OP_ADDNAME 0x0004 /* this is an add operation */
#define XFS_DA_OP_OKNOENT 0x0008 /* lookup/add op, ENOENT ok, else die */
#define XFS_DA_OP_CILOOKUP 0x0010 /* lookup to return CI name if found */
#define XFS_DA_OP_ALLOCVAL 0x0020 /* lookup to alloc buffer if found */
#define XFS_DA_OP_INCOMPLETE 0x0040 /* lookup INCOMPLETE attr keys */
#define XFS_DA_OP_FLAGS \
@ -97,7 +96,6 @@ typedef struct xfs_da_args {
{ XFS_DA_OP_ADDNAME, "ADDNAME" }, \
{ XFS_DA_OP_OKNOENT, "OKNOENT" }, \
{ XFS_DA_OP_CILOOKUP, "CILOOKUP" }, \
{ XFS_DA_OP_ALLOCVAL, "ALLOCVAL" }, \
{ XFS_DA_OP_INCOMPLETE, "INCOMPLETE" }
/*

20
fs/xfs/xfs_acl.c
View File

@ -131,7 +131,7 @@ xfs_get_acl(struct inode *inode, int type)
struct posix_acl *acl = NULL;
struct xfs_da_args args = {
.dp = ip,
.flags = ATTR_ALLOC | ATTR_ROOT,
.flags = ATTR_ROOT,
.valuelen = XFS_ACL_MAX_SIZE(mp),
};
int error;
@ -150,19 +150,19 @@ xfs_get_acl(struct inode *inode, int type)
}
args.namelen = strlen(args.name);
/*
* If the attribute doesn't exist make sure we have a negative cache
* entry, for any other error assume it is transient.
*/
error = xfs_attr_get(&args);
if (error) {
/*
* If the attribute doesn't exist make sure we have a negative
* cache entry, for any other error assume it is transient.
*/
if (error != -ENOATTR)
acl = ERR_PTR(error);
} else {
if (!error) {
acl = xfs_acl_from_disk(mp, args.value, args.valuelen,
XFS_ACL_MAX_ENTRIES(mp));
kmem_free(args.value);
} else if (error != -ENOATTR) {
acl = ERR_PTR(error);
}
kmem_free(args.value);
return acl;
}