xfs: cap the length of deduplication requests

Since deduplication potentially has to read in all the pages in both
files in order to compare the contents, cap the deduplication request
length at MAX_RW_COUNT/2 (roughly 1GB) so that we have /some/ upper bound
on the request length and can't just lock up the kernel forever.  Found
by running generic/304 after commit 1ddae54555b62 ("common/rc: add
missing 'local' keywords").

Reported-by: matorola@gmail.com
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index eed073cc4778..e70fb8ccecea 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -880,8 +880,18 @@ xfs_file_dedupe_range(
         struct file     *dst_file,
         u64             dst_loff)
 {
+        struct inode    *srci = file_inode(src_file);
+        u64             max_dedupe;
         int             error;
 
+        /*
+         * Since we have to read all these pages in to compare them, cut
+         * it off at MAX_RW_COUNT/2 rounded down to the nearest block.
+         * That means we won't do more than MAX_RW_COUNT IO per request.
+         */
+        max_dedupe = (MAX_RW_COUNT >> 1) & ~(i_blocksize(srci) - 1);
+        if (len > max_dedupe)
+                len = max_dedupe;
         error = xfs_reflink_remap_range(src_file, loff, dst_file, dst_loff,
                                      len, true);
         if (error)