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ext4: disable online defrag when inode using iomap buffered I/O path

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Online defragmentation does not currently support inodes using the
iomap buffered I/O path. The existing implementation relies on
buffer_head for sub-folio block management and data=ordered mode for
data consistency, both of which are incompatible with the iomap path.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Tested-by: syzbot@syzkaller.appspotmail.com
Link: https://patch.msgid.link/20261009103033.2920530-21-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Zhang Yi 2026-10-09 18:30:21 +08:00 committed by Theodore Ts'o
parent 008f019ab5
commit 7a40905e58
1 changed files with 11 additions and 0 deletions
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11
fs/ext4/move_extent.c
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@ -476,6 +476,17 @@ static int mext_check_validity(struct inode *orig_inode,
return -EOPNOTSUPP;
}
/*
* TODO: support online defrag for inodes that use the buffered
* I/O iomap path.
*/
if (ext4_inode_buffered_iomap(orig_inode) ||
ext4_inode_buffered_iomap(donor_inode)) {
ext4_msg(sb, KERN_ERR,
"Online defrag not supported for inode with iomap buffered IO path");
return -EOPNOTSUPP;
}
if (donor_inode->i_mode & (S_ISUID|S_ISGID)) {
ext4_debug("ext4 move extent: suid or sgid is set to donor file [ino:orig %llu, donor %llu]\n",
orig_inode->i_ino, donor_inode->i_ino);