diff options
Diffstat (limited to 'fs/ext4/xattr.c')
| -rw-r--r-- | fs/ext4/xattr.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index c6af8a7a436a..b661ae8332e3 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -1096,6 +1096,17 @@ static int ext4_xattr_ibody_set(handle_t *handle, struct inode *inode, return 0; } +static int ext4_xattr_value_same(struct ext4_xattr_search *s, + struct ext4_xattr_info *i) +{ + void *value; + + if (le32_to_cpu(s->here->e_value_size) != i->value_len) + return 0; + value = ((void *)s->base) + le16_to_cpu(s->here->e_value_offs); + return !memcmp(value, i->value, i->value_len); +} + /* * ext4_xattr_set_handle() * @@ -1172,6 +1183,13 @@ ext4_xattr_set_handle(handle_t *handle, struct inode *inode, int name_index, else if (!bs.s.not_found) error = ext4_xattr_block_set(handle, inode, &i, &bs); } else { + error = 0; + /* Xattr value did not change? Save us some work and bail out */ + if (!is.s.not_found && ext4_xattr_value_same(&is.s, &i)) + goto cleanup; + if (!bs.s.not_found && ext4_xattr_value_same(&bs.s, &i)) + goto cleanup; + error = ext4_xattr_ibody_set(handle, inode, &i, &is); if (!error && !bs.s.not_found) { i.value = NULL; |