ocfs2: return EINVAL if the given range to discard is less than block size

For FITRIM ioctl(2), we should not keep silence if the given range
length ls less than a block size as there is no data blocks would be
discareded.  Hence it should return EINVAL instead.  This issue can be
verified via xfstests/generic/288 which is used for FITRIM argument
handling tests.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 7 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index dc7411fe185d..8750ae1b8636 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -7260,14 +7260,8 @@ int ocfs2_trim_fs(struct super_block *sb, struct fstrim_range *range)
         start = range->start >> osb->s_clustersize_bits;
         len = range->len >> osb->s_clustersize_bits;
         minlen = range->minlen >> osb->s_clustersize_bits;
-        trimmed = 0;
-
-        if (!len) {
-                range->len = 0;
-                return 0;
-        }
 
-        if (minlen >= osb->bitmap_cpg)
+        if (minlen >= osb->bitmap_cpg || range->len < sb->s_blocksize)
                 return -EINVAL;
 
         main_bm_inode = ocfs2_get_system_file_inode(osb,
@@ -7293,6 +7287,7 @@ int ocfs2_trim_fs(struct super_block *sb, struct fstrim_range *range)
                 goto out_unlock;
         }
 
+        len = range->len >> osb->s_clustersize_bits;
         if (start + len > le32_to_cpu(main_bm->i_clusters))
                 len = le32_to_cpu(main_bm->i_clusters) - start;
 
@@ -7307,6 +7302,7 @@ int ocfs2_trim_fs(struct super_block *sb, struct fstrim_range *range)
         last_group = ocfs2_which_cluster_group(main_bm_inode, start + len - 1);
         last_bit = osb->bitmap_cpg;
 
+        trimmed = 0;
         for (group = first_group; group <= last_group;) {
                 if (first_bit + len >= osb->bitmap_cpg)
                         last_bit = osb->bitmap_cpg;