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Btrfs: optimize btrget/set/removexattr

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btrfs actually stores the whole xattr name, including the prefix ondisk,
so using the generic resolver that strips off the prefix is not very
helpful.  Instead do the real ondisk xattrs manually and only use the
generic resolver for synthetic xattrs like ACLs.

(Sorry Josef for guiding you towards the wrong direction here intially)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Christoph Hellwig
2008-08-28 06:21:17 -04:00
committed by Chris Mason
parent eaa47d8612
commit 95819c0573
4 changed files with 104 additions and 170 deletions
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20
fs/btrfs/acl.c
View File

@@ -42,17 +42,18 @@ static void btrfs_update_cached_acl(struct inode *inode,
static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
{
int size, name_index;
int size;
const char *name;
char *value = NULL;
struct posix_acl *acl = NULL, **p_acl;
switch (type) {
case ACL_TYPE_ACCESS:
name_index = BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS;
name = POSIX_ACL_XATTR_ACCESS;
p_acl = &BTRFS_I(inode)->i_acl;
break;
case ACL_TYPE_DEFAULT:
name_index = BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &BTRFS_I(inode)->i_default_acl;
break;
default:
@@ -68,12 +69,12 @@ static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
return acl;
size = btrfs_xattr_get(inode, name_index, "", NULL, 0);
size = __btrfs_getxattr(inode, name, "", 0);
if (size > 0) {
value = kzalloc(size, GFP_NOFS);
if (!value)
return ERR_PTR(-ENOMEM);
size = btrfs_xattr_get(inode, name_index, "", value, size);
size = __btrfs_getxattr(inode, name, value, size);
if (size > 0) {
acl = posix_acl_from_xattr(value, size);
btrfs_update_cached_acl(inode, p_acl, acl);
@@ -110,7 +111,8 @@ static int btrfs_xattr_get_acl(struct inode *inode, int type,
*/
static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
{
int ret, name_index = 0, size = 0;
int ret, size = 0;
const char *name;
struct posix_acl **p_acl;
char *value = NULL;
mode_t mode;
@@ -130,13 +132,13 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
return ret;
ret = 0;
inode->i_mode = mode;
name_index = BTRFS_XATTR_INDEX_POSIX_ACL_ACCESS;
name = POSIX_ACL_XATTR_ACCESS;
p_acl = &BTRFS_I(inode)->i_acl;
break;
case ACL_TYPE_DEFAULT:
if (!S_ISDIR(inode->i_mode))
return acl ? -EINVAL : 0;
name_index = BTRFS_XATTR_INDEX_POSIX_ACL_DEFAULT;
name = POSIX_ACL_XATTR_DEFAULT;
p_acl = &BTRFS_I(inode)->i_default_acl;
break;
default:
@@ -156,7 +158,7 @@ static int btrfs_set_acl(struct inode *inode, struct posix_acl *acl, int type)
goto out;
}
ret = btrfs_xattr_set(inode, name_index, "", value, size, 0);
ret = __btrfs_setxattr(inode, name, value, size, 0);
out:
if (value)