[GFS2] fix inode meta data corruption

Fix a nasty inode meta data corruption issue by keeping the buffer head in
icache array. This buffer needs to stay in memory until journal flush occurs
Otherwise, gfs2_meta_inode_buffer could do a disk read before the inode hits
disk. It ends up with meta data corruptions. The buffer will be released as
part of the existing journal flush logic.

Signed-off-by: S. Wendy Cheng <wcheng@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 34f7bcd..013f00b 100644 (file)
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -244,6 +244,11 @@ static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
        return 0;
 }
 
+static void gfs2_inode_bh(struct gfs2_inode *ip, struct buffer_head *bh)
+{
+       ip->i_cache[0] = bh;
+}
+
 /**
  * gfs2_inode_refresh - Refresh the incore copy of the dinode
  * @ip: The GFS2 inode
@@ -688,7 +693,7 @@ out:
 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
                        const struct gfs2_inum_host *inum, unsigned int mode,
                        unsigned int uid, unsigned int gid,
-                       const u64 *generation, dev_t dev)
+                       const u64 *generation, dev_t dev, struct buffer_head **bhp)
 {
        struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
        struct gfs2_dinode *di;
@@ -743,13 +748,15 @@ static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
        di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec);
        di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec);
        memset(&di->di_reserved, 0, sizeof(di->di_reserved));
+       
+       set_buffer_uptodate(dibh);
 
-       brelse(dibh);
+       *bhp = dibh;
 }
 
 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
                       unsigned int mode, const struct gfs2_inum_host *inum,
-                      const u64 *generation, dev_t dev)
+                      const u64 *generation, dev_t dev, struct buffer_head **bhp)
 {
        struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
        unsigned int uid, gid;
@@ -770,7 +777,7 @@ static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
        if (error)
                goto out_quota;
 
-       init_dinode(dip, gl, inum, mode, uid, gid, generation, dev);
+       init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp);
        gfs2_quota_change(dip, +1, uid, gid);
        gfs2_trans_end(sdp);
 
@@ -909,6 +916,7 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
        struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 };
        int error;
        u64 generation;
+       struct buffer_head *bh=NULL;
 
        if (!name->len || name->len > GFS2_FNAMESIZE)
                return ERR_PTR(-ENAMETOOLONG);
@@ -935,7 +943,7 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
        if (error)
                goto fail_gunlock;
 
-       error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev);
+       error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh);
        if (error)
                goto fail_gunlock2;
 
@@ -945,6 +953,8 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
        if (IS_ERR(inode))
                goto fail_gunlock2;
 
+       gfs2_inode_bh(GFS2_I(inode), bh);
+
        error = gfs2_inode_refresh(GFS2_I(inode));
        if (error)
                goto fail_gunlock2;