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>
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index efc078f..6c79408 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -811,6 +811,8 @@
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 @@
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_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;
}
