Quoted from manual of fstrim(8):
"-m, --minimum minimum-size
..., if it's smaller than the device's minimum, and report that
(fstrim_range.minlen) back to userspace."
So this patch tries to report adjusted fstrim_range.minlen back to
userspace via FITRIM interface, if the value is smaller than device's
minimum discard granularity.
Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
---
v2:
- fix the wrong calculation of range->minlen.
fs/ext4/mballoc.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index d8b9d6a83d1e..4af51a16fc64 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -6491,6 +6491,10 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
discard_granularity >> sb->s_blocksize_bits);
if (minlen > EXT4_CLUSTERS_PER_GROUP(sb))
goto out;
+
+ /* Report adjusted minlen back to userspace */
+ range->minlen = EXT4_C2B(EXT4_SB(sb), minlen) <<
+ sb->s_blocksize_bits;
}
if (end >= max_blks - 1) {
end = max_blks - 1;
--
2.25.1
