1 files changed, 8 insertions, 2 deletions

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 23eab473f09d..a9f5cbe45cd9 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -816,6 +816,7 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
         loff_t bytes, max_bytes;
         struct gfs2_alloc *al;
         int error;
+        loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
         loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
         next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
 
@@ -823,13 +824,15 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
         if (mode & ~FALLOC_FL_KEEP_SIZE)
                 return -EOPNOTSUPP;
 
-        offset = (offset >> sdp->sd_sb.sb_bsize_shift) <<
-                 sdp->sd_sb.sb_bsize_shift;
+        offset &= bsize_mask;
 
         len = next - offset;
         bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
         if (!bytes)
                 bytes = UINT_MAX;
+        bytes &= bsize_mask;
+        if (bytes == 0)
+                bytes = sdp->sd_sb.sb_bsize;
 
         gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
         error = gfs2_glock_nq(&ip->i_gh);
@@ -860,6 +863,9 @@ retry:
                 if (error) {
                         if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
                                 bytes >>= 1;
+                                bytes &= bsize_mask;
+                                if (bytes == 0)
+                                        bytes = sdp->sd_sb.sb_bsize;
                                 goto retry;
                         }
                         goto out_qunlock;