[GFS2] Obtaining no_formal_ino from directory entry

GFS2 lookup code doesn't ask for inode shared glock. This implies during
in-memory inode creation for existing file, GFS2 will not disk-read in
the inode contents. This leaves no_formal_ino un-initialized during
lookup time. The un-initialized no_formal_ino is subsequently encoded
into file handle. Clients will get ESTALE error whenever it tries to
access these files.

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

6 files changed, 24 insertions, 13 deletions

diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index f793e31a050e..2beb2f401aa2 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -1498,9 +1498,10 @@ struct inode *gfs2_dir_search(struct inode *dir, const struct qstr *name)
         if (dent) {
                 if (IS_ERR(dent))
                         return ERR_PTR(PTR_ERR(dent));
-                inode = gfs2_inode_lookup(dir->i_sb,
-                                          be64_to_cpu(dent->de_inum.no_addr),
-                                          be16_to_cpu(dent->de_type));
+                inode = gfs2_inode_lookup(dir->i_sb, 
+                                be16_to_cpu(dent->de_type),
+                                be64_to_cpu(dent->de_inum.no_addr),
+                                be64_to_cpu(dent->de_inum.no_formal_ino));
                 brelse(bh);
                 return inode;
         }
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 792d64f69cc2..26aaf54959d9 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -86,7 +86,10 @@ static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
  * Returns: A VFS inode, or an error
  */
 
-struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned int type)
+struct inode *gfs2_inode_lookup(struct super_block *sb, 
+                                unsigned int type,
+                                u64 no_addr,
+                                u64 no_formal_ino)
 {
         struct inode *inode = gfs2_iget(sb, no_addr);
         struct gfs2_inode *ip = GFS2_I(inode);
@@ -100,6 +103,7 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned in
                 struct gfs2_sbd *sdp = GFS2_SB(inode);
                 umode_t mode;
                 inode->i_private = ip;
+                ip->i_no_formal_ino = no_formal_ino;
 
                 error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl);
                 if (unlikely(error))
@@ -915,7 +919,9 @@ struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name,
         if (error)
                 goto fail_gunlock2;
 
-        inode = gfs2_inode_lookup(dir->i_sb, inum.no_addr, IF2DT(mode));
+        inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode),
+                                        inum.no_addr,
+                                        inum.no_formal_ino);
         if (IS_ERR(inode))
                 goto fail_gunlock2;
 
diff --git a/fs/gfs2/inode.h b/fs/gfs2/inode.h
index 35375fc43fa3..3268a2fed672 100644
--- a/fs/gfs2/inode.h
+++ b/fs/gfs2/inode.h
@@ -47,7 +47,8 @@ static inline void gfs2_inum_out(const struct gfs2_inode *ip,
 
 
 void gfs2_inode_attr_in(struct gfs2_inode *ip);
-struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned type);
+struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type, 
+                                u64 no_addr, u64 no_formal_ino);
 struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr);
 
 int gfs2_inode_refresh(struct gfs2_inode *ip);
diff --git a/fs/gfs2/ops_export.c b/fs/gfs2/ops_export.c
index d07230ee5fc0..0fe14478a54d 100644
--- a/fs/gfs2/ops_export.c
+++ b/fs/gfs2/ops_export.c
@@ -245,7 +245,9 @@ static struct dentry *gfs2_get_dentry(struct super_block *sb, void *inum_obj)
         gfs2_glock_dq_uninit(&rgd_gh);
         gfs2_glock_dq_uninit(&ri_gh);
 
-        inode = gfs2_inode_lookup(sb, inum->no_addr, fh_obj->imode);
+        inode = gfs2_inode_lookup(sb, fh_obj->imode,
+                                        inum->no_addr,
+                                        inum->no_formal_ino);
         if (!inode)
                 goto fail;
         if (IS_ERR(inode)) {
diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index dae1d7142fe5..cf5aa5050548 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -236,7 +236,7 @@ fail:
 static inline struct inode *gfs2_lookup_root(struct super_block *sb,
                                              u64 no_addr)
 {
-        return gfs2_inode_lookup(sb, no_addr, DT_DIR);
+        return gfs2_inode_lookup(sb, DT_DIR, no_addr, 0);
 }
 
 static int init_sb(struct gfs2_sbd *sdp, int silent, int undo)
diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 36c523d487a7..7fb74484af63 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -860,18 +860,19 @@ static struct inode *try_rgrp_unlink(struct gfs2_rgrpd *rgd, u64 *last_unlinked)
 {
         struct inode *inode;
         u32 goal = 0;
-        u64 ino;
+        u64 no_addr;
 
         for(;;) {
                 goal = rgblk_search(rgd, goal, GFS2_BLKST_UNLINKED,
                                     GFS2_BLKST_UNLINKED);
                 if (goal == 0)
                         return 0;
-                ino = goal + rgd->rd_data0;
-                if (ino <= *last_unlinked)
+                no_addr = goal + rgd->rd_data0;
+                if (no_addr <= *last_unlinked)
                         continue;
-                *last_unlinked = ino;
-                inode = gfs2_inode_lookup(rgd->rd_sbd->sd_vfs, ino, DT_UNKNOWN);
+                *last_unlinked = no_addr;
+                inode = gfs2_inode_lookup(rgd->rd_sbd->sd_vfs, DT_UNKNOWN,
+                                        no_addr, 0);
                 if (!IS_ERR(inode))
                         return inode;
         }