NFS: Clean-up: Refactor IP address sanity checks in NFS client

[mirror_ubuntu-artful-kernel.git] / fs / gfs2 / inode.c

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index 792d64f69cc25ceb642df8a27a13e6f4d5b7ae60..34f7bcdea1e972e00187013eddd98272d65a40f0 100644 (file)
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -77,6 +77,36 @@ static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr)
        return iget5_locked(sb, hash, iget_test, iget_set, &no_addr);
 }
 
+/**
+ * GFS2 lookup code fills in vfs inode contents based on info obtained
+ * from directory entry inside gfs2_inode_lookup(). This has caused issues
+ * with NFS code path since its get_dentry routine doesn't have the relevant
+ * directory entry when gfs2_inode_lookup() is invoked. Part of the code
+ * segment inside gfs2_inode_lookup code needs to get moved around.
+ *
+ * Clean up I_LOCK and I_NEW as well.
+ **/
+
+void gfs2_set_iop(struct inode *inode)
+{
+       umode_t mode = inode->i_mode;
+
+       if (S_ISREG(mode)) {
+               inode->i_op = &gfs2_file_iops;
+               inode->i_fop = &gfs2_file_fops;
+               inode->i_mapping->a_ops = &gfs2_file_aops;
+       } else if (S_ISDIR(mode)) {
+               inode->i_op = &gfs2_dir_iops;
+               inode->i_fop = &gfs2_dir_fops;
+       } else if (S_ISLNK(mode)) {
+               inode->i_op = &gfs2_symlink_iops;
+       } else {
+               inode->i_op = &gfs2_dev_iops;
+       }
+
+       unlock_new_inode(inode);
+}
+
 /**
  * gfs2_inode_lookup - Lookup an inode
  * @sb: The super block
@@ -86,7 +116,10 @@ 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);
@@ -98,8 +131,8 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned in
 
        if (inode->i_state & I_NEW) {
                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))
@@ -118,6 +151,11 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned in
 
                gfs2_glock_put(io_gl);
 
+               if ((type == DT_UNKNOWN) && (no_formal_ino == 0))
+                       goto gfs2_nfsbypass;
+
+               inode->i_mode = DT2IF(type);
+
                /*
                 * We must read the inode in order to work out its type in
                 * this case. Note that this doesn't happen often as we normally
@@ -125,33 +163,19 @@ struct inode *gfs2_inode_lookup(struct super_block *sb, u64 no_addr, unsigned in
                 * unlinked inode recovery (where it is safe to do this glock,
                 * which is not true in the general case).
                 */
-               inode->i_mode = mode = DT2IF(type);
                if (type == DT_UNKNOWN) {
                        struct gfs2_holder gh;
                        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
                        if (unlikely(error))
                                goto fail_glock;
                        /* Inode is now uptodate */
-                       mode = inode->i_mode;
                        gfs2_glock_dq_uninit(&gh);
                }
 
-               if (S_ISREG(mode)) {
-                       inode->i_op = &gfs2_file_iops;
-                       inode->i_fop = &gfs2_file_fops;
-                       inode->i_mapping->a_ops = &gfs2_file_aops;
-               } else if (S_ISDIR(mode)) {
-                       inode->i_op = &gfs2_dir_iops;
-                       inode->i_fop = &gfs2_dir_fops;
-               } else if (S_ISLNK(mode)) {
-                       inode->i_op = &gfs2_symlink_iops;
-               } else {
-                       inode->i_op = &gfs2_dev_iops;
-               }
-
-               unlock_new_inode(inode);
+               gfs2_set_iop(inode);
        }
 
+gfs2_nfsbypass:
        return inode;
 fail_glock:
        gfs2_glock_dq(&ip->i_iopen_gh);
@@ -915,7 +939,9 @@ 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;