ext4: improve journal credit handling in set xattr paths
Both ext4_set_acl() and ext4_set_context() need to be made aware of
ea_inode feature when it comes to credits calculation.
Also add a sufficient credits check in ext4_xattr_set_handle() right
after xattr write lock is grabbed. Original credits calculation is done
outside the lock so there is a possiblity that the initially calculated
credits are not sufficient anymore.
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index c8b71bd..43a2c07 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1471,6 +1471,17 @@
ext4_write_lock_xattr(inode, &no_expand);
+ /* Check journal credits under write lock. */
+ if (ext4_handle_valid(handle)) {
+ int credits;
+
+ credits = ext4_xattr_set_credits(inode, value_len);
+ if (!ext4_handle_has_enough_credits(handle, credits)) {
+ error = -ENOSPC;
+ goto cleanup;
+ }
+ }
+
error = ext4_reserve_inode_write(handle, inode, &is.iloc);
if (error)
goto cleanup;
@@ -1568,6 +1579,36 @@
return error;
}
+int ext4_xattr_set_credits(struct inode *inode, size_t value_len)
+{
+ struct super_block *sb = inode->i_sb;
+ int credits;
+
+ if (!EXT4_SB(sb)->s_journal)
+ return 0;
+
+ credits = EXT4_DATA_TRANS_BLOCKS(inode->i_sb);
+
+ /*
+ * In case of inline data, we may push out the data to a block,
+ * so we need to reserve credits for this eventuality
+ */
+ if (ext4_has_inline_data(inode))
+ credits += ext4_writepage_trans_blocks(inode) + 1;
+
+ if (ext4_has_feature_ea_inode(sb)) {
+ int nrblocks = (value_len + sb->s_blocksize - 1) >>
+ sb->s_blocksize_bits;
+
+ /* For new inode */
+ credits += EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + 3;
+
+ /* For data blocks of EA inode */
+ credits += ext4_meta_trans_blocks(inode, nrblocks, 0);
+ }
+ return credits;
+}
+
/*
* ext4_xattr_set()
*
@@ -1583,24 +1624,14 @@
handle_t *handle;
struct super_block *sb = inode->i_sb;
int error, retries = 0;
- int credits = ext4_jbd2_credits_xattr(inode);
+ int credits;
error = dquot_initialize(inode);
if (error)
return error;
- if (ext4_has_feature_ea_inode(sb)) {
- int nrblocks = (value_len + sb->s_blocksize - 1) >>
- sb->s_blocksize_bits;
-
- /* For new inode */
- credits += EXT4_SINGLEDATA_TRANS_BLOCKS(sb) + 3;
-
- /* For data blocks of EA inode */
- credits += ext4_meta_trans_blocks(inode, nrblocks, 0);
- }
-
retry:
+ credits = ext4_xattr_set_credits(inode, value_len);
handle = ext4_journal_start(inode, EXT4_HT_XATTR, credits);
if (IS_ERR(handle)) {
error = PTR_ERR(handle);