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ext4: prevent delalloc to nodelalloc on remount

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Implemented the suggested solution mentioned in the bug
https://bugzilla.kernel.org/show_bug.cgi?id=218820

Preventing the disabling of delayed allocation mode on remount.
delalloc to nodelalloc not permitted anymore
nodelalloc to delalloc permitted, not affected

Signed-off-by: Nicolas Bretz <bretznic@gmail.com>
Link: https://patch.msgid.link/20241014034143.59779-1-bretznic@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Nicolas Bretz 2024-10-13 20:41:43 -07:00 committed by Theodore Ts'o
parent abe1ac7ca8
commit 97f5ec3b16
1 changed files with 7 additions and 0 deletions
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7
fs/ext4/super.c
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@ -6528,6 +6528,13 @@ static int __ext4_remount(struct fs_context *fc, struct super_block *sb)
goto restore_opts;
}
if ((old_opts.s_mount_opt & EXT4_MOUNT_DELALLOC) &&
!test_opt(sb, DELALLOC)) {
ext4_msg(sb, KERN_ERR, "can't disable delalloc during remount");
err = -EINVAL;
goto restore_opts;
}
sb->s_flags = (sb->s_flags & ~SB_POSIXACL) |
(test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0);