gfs2: Prevent endless loops in gfs2_file_buffered_write

Currently, instead of performing a short write,
iomap_file_buffered_write will fail when part of its iov iterator cannot
be read.  In contrast, gfs2_file_buffered_write will loop around if it
can read part of the iov iterator, so we can end up in an endless loop.

This should be fixed in iomap_file_buffered_write (and also
generic_perform_write), but this comes a bit late in the 5.16
development cycle, so work around it in the filesystem by
trimming the iov iterator to the known-good size for now.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index c486b702e00f907e638b9d86538fb5f58e308c7e..3e718cfc19a793eb29225eb685cc17b00f60d6c0 100644 (file)
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -1013,6 +1013,7 @@ static ssize_t gfs2_file_buffered_write(struct kiocb *iocb,
        struct gfs2_sbd *sdp = GFS2_SB(inode);
        struct gfs2_holder *statfs_gh = NULL;
        size_t prev_count = 0, window_size = 0;
+       size_t orig_count = iov_iter_count(from);
        size_t read = 0;
        ssize_t ret;
 
@@ -1057,6 +1058,7 @@ retry_under_glock:
        if (inode == sdp->sd_rindex)
                gfs2_glock_dq_uninit(statfs_gh);
 
+       from->count = orig_count - read;
        if (should_fault_in_pages(ret, from, &prev_count, &window_size)) {
                size_t leftover;
 
@@ -1064,6 +1066,7 @@ retry_under_glock:
                leftover = fault_in_iov_iter_readable(from, window_size);
                gfs2_holder_disallow_demote(gh);
                if (leftover != window_size) {
+                       from->count = min(from->count, window_size - leftover);
                        if (!gfs2_holder_queued(gh)) {
                                if (read)
                                        goto out_uninit;