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ext2: optimize ext2_xattr_get()

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Since xattr entry names are sorted, we don't have
to continue when current entry name is greater than
target.

Signed-off-by: Chengguang Xu <cgxu519@zoho.com.cn>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Chengguang Xu 2019-05-28 10:59:47 +08:00 committed by Jan Kara
parent d561d4dd4f
commit 1eaf5faab1
1 changed files with 8 additions and 4 deletions
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12
fs/ext2/xattr.c
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@ -199,7 +199,7 @@ ext2_xattr_get(struct inode *inode, int name_index, const char *name,
struct ext2_xattr_entry *entry;
size_t name_len, size;
char *end;
int error;
int error, not_found;
struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld",
@ -238,10 +238,14 @@ ext2_xattr_get(struct inode *inode, int name_index, const char *name,
if (!ext2_xattr_entry_valid(entry, end,
inode->i_sb->s_blocksize))
goto bad_block;
if (name_index == entry->e_name_index &&
name_len == entry->e_name_len &&
memcmp(name, entry->e_name, name_len) == 0)
not_found = ext2_xattr_cmp_entry(name_index, name_len, name,
entry);
if (!not_found)
goto found;
if (not_found < 0)
break;
entry = EXT2_XATTR_NEXT(entry);
}
if (ext2_xattr_cache_insert(ea_block_cache, bh))