ext4: avoid trim error on fs with small groups

[ Upstream commit 173b6e383d2a204c9921ffc1eca3b87aa2106c33 ]

A user reported FITRIM ioctl failing for him on ext4 on some devices
without apparent reason.  After some debugging we've found out that
these devices (being LVM volumes) report rather large discard
granularity of 42MB and the filesystem had 1k blocksize and thus group
size of 8MB. Because ext4 FITRIM implementation puts discard
granularity into minlen, ext4_trim_fs() declared the trim request as
invalid. However just silently doing nothing seems to be a more
appropriate reaction to such combination of parameters since user did
not specify anything wrong.

CC: Lukas Czerner <lczerner@redhat.com>
Fixes: 5c2ed62fd447 ("ext4: Adjust minlen with discard_granularity in the FITRIM ioctl")
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20211112152202.26614-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 6718c7ccd63146991f29963fbac1a35d869a52ae..3bd79fc4e94870efedcb5ff15d3f80c3d7627fa7 100644 (file)
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -992,8 +992,6 @@ resizefs_out:
                    sizeof(range)))
                        return -EFAULT;
 
-               range.minlen = max((unsigned int)range.minlen,
-                                  q->limits.discard_granularity);
                ret = ext4_trim_fs(sb, &range);
                if (ret < 0)
                        return ret;

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index c40d3c44a1d69d05b18914155628ff441a512d2b..28bee66c5fbf099aea17a7a1e3792344be104bba 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -5284,6 +5284,7 @@ out:
  */
 int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
 {
+       struct request_queue *q = bdev_get_queue(sb->s_bdev);
        struct ext4_group_info *grp;
        ext4_group_t group, first_group, last_group;
        ext4_grpblk_t cnt = 0, first_cluster, last_cluster;
@@ -5302,6 +5303,13 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
            start >= max_blks ||
            range->len < sb->s_blocksize)
                return -EINVAL;
+       /* No point to try to trim less than discard granularity */
+       if (range->minlen < q->limits.discard_granularity) {
+               minlen = EXT4_NUM_B2C(EXT4_SB(sb),
+                       q->limits.discard_granularity >> sb->s_blocksize_bits);
+               if (minlen > EXT4_CLUSTERS_PER_GROUP(sb))
+                       goto out;
+       }
        if (end >= max_blks)
                end = max_blks - 1;
        if (end <= first_data_blk)