GFS2: Lock i_mutex and use a local gfs2_holder for fallocate

This patch causes GFS2 to lock the i_mutex during fallocate. It
also switches from using a dinode's inode glock to using a local
holder like the other GFS2 i_operations.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index efc078f0ee4e..6c794085abac 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -811,6 +811,8 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
         loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
         loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
         loff_t max_chunk_size = UINT_MAX & bsize_mask;
+        struct gfs2_holder gh;
+
         next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
 
         /* We only support the FALLOC_FL_KEEP_SIZE mode */
@@ -831,8 +833,10 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
         if (error)
                 return error;
 
-        gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
-        error = gfs2_glock_nq(&ip->i_gh);
+        mutex_lock(&inode->i_mutex);
+
+        gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
+        error = gfs2_glock_nq(&gh);
         if (unlikely(error))
                 goto out_uninit;
 
@@ -900,9 +904,10 @@ out_trans_fail:
 out_qunlock:
         gfs2_quota_unlock(ip);
 out_unlock:
-        gfs2_glock_dq(&ip->i_gh);
+        gfs2_glock_dq(&gh);
 out_uninit:
-        gfs2_holder_uninit(&ip->i_gh);
+        gfs2_holder_uninit(&gh);
+        mutex_unlock(&inode->i_mutex);
         return error;
 }