ext4, project: expand inode extra size if possible

When upgrading from old format, try to set project id
to old file first time, it will return EOVERFLOW, but if
that file is dirtied(touch etc), changing project id will
be allowed, this might be confusing for users, we could
try to expand @i_extra_isize here too.

Reported-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Miao Xie <miaoxie@huawei.com>
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 76 insertions, 21 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 713b67e85f73..c774bdc22759 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5702,6 +5702,42 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
 	return err;
 }
 
+static int __ext4_expand_extra_isize(struct inode *inode,
+				     unsigned int new_extra_isize,
+				     struct ext4_iloc *iloc,
+				     handle_t *handle, int *no_expand)
+{
+	struct ext4_inode *raw_inode;
+	struct ext4_xattr_ibody_header *header;
+	int error;
+
+	raw_inode = ext4_raw_inode(iloc);
+
+	header = IHDR(inode, raw_inode);
+
+	/* No extended attributes present */
+	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
+	    header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) {
+		memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE +
+		       EXT4_I(inode)->i_extra_isize, 0,
+		       new_extra_isize - EXT4_I(inode)->i_extra_isize);
+		EXT4_I(inode)->i_extra_isize = new_extra_isize;
+		return 0;
+	}
+
+	/* try to expand with EAs present */
+	error = ext4_expand_extra_isize_ea(inode, new_extra_isize,
+					   raw_inode, handle);
+	if (error) {
+		/*
+		 * Inode size expansion failed; don't try again
+		 */
+		*no_expand = 1;
+	}
+
+	return error;
+}
+
 /*
  * Expand an inode by new_extra_isize bytes.
  * Returns 0 on success or negative error number on failure.
@@ -5711,8 +5747,6 @@ static int ext4_try_to_expand_extra_isize(struct inode *inode,
 					  struct ext4_iloc iloc,
 					  handle_t *handle)
 {
-	struct ext4_inode *raw_inode;
-	struct ext4_xattr_ibody_header *header;
 	int no_expand;
 	int error;
 
@@ -5736,32 +5770,53 @@ static int ext4_try_to_expand_extra_isize(struct inode *inode,
 	if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
 		return -EBUSY;
 
-	raw_inode = ext4_raw_inode(&iloc);
+	error = __ext4_expand_extra_isize(inode, new_extra_isize, &iloc,
+					  handle, &no_expand);
+	ext4_write_unlock_xattr(inode, &no_expand);
 
-	header = IHDR(inode, raw_inode);
+	return error;
+}
 
-	/* No extended attributes present */
-	if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR) ||
-	    header->h_magic != cpu_to_le32(EXT4_XATTR_MAGIC)) {
-		memset((void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE +
-		       EXT4_I(inode)->i_extra_isize, 0,
-		       new_extra_isize - EXT4_I(inode)->i_extra_isize);
-		EXT4_I(inode)->i_extra_isize = new_extra_isize;
-		ext4_write_unlock_xattr(inode, &no_expand);
-		return 0;
+int ext4_expand_extra_isize(struct inode *inode,
+			    unsigned int new_extra_isize,
+			    struct ext4_iloc *iloc)
+{
+	handle_t *handle;
+	int no_expand;
+	int error, rc;
+
+	if (ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) {
+		brelse(iloc->bh);
+		return -EOVERFLOW;
 	}
 
-	/* try to expand with EAs present */
-	error = ext4_expand_extra_isize_ea(inode, new_extra_isize,
-					   raw_inode, handle);
+	handle = ext4_journal_start(inode, EXT4_HT_INODE,
+				    EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
+	if (IS_ERR(handle)) {
+		error = PTR_ERR(handle);
+		brelse(iloc->bh);
+		return error;
+	}
+
+	ext4_write_lock_xattr(inode, &no_expand);
+
+	BUFFER_TRACE(iloc.bh, "get_write_access");
+	error = ext4_journal_get_write_access(handle, iloc->bh);
 	if (error) {
-		/*
-		 * Inode size expansion failed; don't try again
-		 */
-		no_expand = 1;
+		brelse(iloc->bh);
+		goto out_stop;
 	}
-	ext4_write_unlock_xattr(inode, &no_expand);
 
+	error = __ext4_expand_extra_isize(inode, new_extra_isize, iloc,
+					  handle, &no_expand);
+
+	rc = ext4_mark_iloc_dirty(handle, inode, iloc);
+	if (!error)
+		error = rc;
+
+	ext4_write_unlock_xattr(inode, &no_expand);
+out_stop:
+	ext4_journal_stop(handle);
 	return error;
 }