iget: stop JFFS2 from using iget() and read_inode()

Stop the JFFS2 filesystem from using iget() and read_inode().  Replace
jffs2_read_inode() with jffs2_iget(), and call that instead of iget().
jffs2_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

jffs2_do_fill_super() returns any error incurred when getting the root inode
instead of EINVAL.

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

4 files changed, 39 insertions, 26 deletions

diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index 787e392ffd41..f948f7e6ec82 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -101,10 +101,10 @@ static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
                 ino = fd->ino;
         up(&dir_f->sem);
         if (ino) {
-                inode = iget(dir_i->i_sb, ino);
-                if (!inode) {
+                inode = jffs2_iget(dir_i->i_sb, ino);
+                if (IS_ERR(inode)) {
                         printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
-                        return (ERR_PTR(-EIO));
+                        return ERR_CAST(inode);
                 }
         }
 
diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c
index d2e06f7ea96f..6d1eaddde0ec 100644
--- a/fs/jffs2/fs.c
+++ b/fs/jffs2/fs.c
@@ -230,16 +230,23 @@ void jffs2_clear_inode (struct inode *inode)
         jffs2_do_clear_inode(c, f);
 }
 
-void jffs2_read_inode (struct inode *inode)
+struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
 {
         struct jffs2_inode_info *f;
         struct jffs2_sb_info *c;
         struct jffs2_raw_inode latest_node;
         union jffs2_device_node jdev;
+        struct inode *inode;
         dev_t rdev = 0;
         int ret;
 
-        D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino));
+        D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino));
+
+        inode = iget_locked(sb, ino);
+        if (!inode)
+                return ERR_PTR(-ENOMEM);
+        if (!(inode->i_state & I_NEW))
+                return inode;
 
         f = JFFS2_INODE_INFO(inode);
         c = JFFS2_SB_INFO(inode->i_sb);
@@ -250,9 +257,9 @@ void jffs2_read_inode (struct inode *inode)
         ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
 
         if (ret) {
-                make_bad_inode(inode);
                 up(&f->sem);
-                return;
+                iget_failed(inode);
+                return ERR_PTR(ret);
         }
         inode->i_mode = jemode_to_cpu(latest_node.mode);
         inode->i_uid = je16_to_cpu(latest_node.uid);
@@ -303,19 +310,14 @@ void jffs2_read_inode (struct inode *inode)
                 if (f->metadata->size != sizeof(jdev.old) &&
                     f->metadata->size != sizeof(jdev.new)) {
                         printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size);
-                        up(&f->sem);
-                        jffs2_do_clear_inode(c, f);
-                        make_bad_inode(inode);
-                        return;
+                        goto error_io;
                 }
                 D1(printk(KERN_DEBUG "Reading device numbers from flash\n"));
-                if (jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size) < 0) {
+                ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
+                if (ret < 0) {
                         /* Eep */
                         printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino);
-                        up(&f->sem);
-                        jffs2_do_clear_inode(c, f);
-                        make_bad_inode(inode);
-                        return;
+                        goto error;
                 }
                 if (f->metadata->size == sizeof(jdev.old))
                         rdev = old_decode_dev(je16_to_cpu(jdev.old));
@@ -335,6 +337,16 @@ void jffs2_read_inode (struct inode *inode)
         up(&f->sem);
 
         D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n"));
+        unlock_new_inode(inode);
+        return inode;
+
+error_io:
+        ret = -EIO;
+error:
+        up(&f->sem);
+        jffs2_do_clear_inode(c, f);
+        iget_failed(inode);
+        return ERR_PTR(ret);
 }
 
 void jffs2_dirty_inode(struct inode *inode)
@@ -522,15 +534,16 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
         if ((ret = jffs2_do_mount_fs(c)))
                 goto out_inohash;
 
-        ret = -EINVAL;
-
         D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n"));
-        root_i = iget(sb, 1);
-        if (is_bad_inode(root_i)) {
+        root_i = jffs2_iget(sb, 1);
+        if (IS_ERR(root_i)) {
                 D1(printk(KERN_WARNING "get root inode failed\n"));
-                goto out_root_i;
+                ret = PTR_ERR(root_i);
+                goto out_root;
         }
 
+        ret = -ENOMEM;
+
         D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n"));
         sb->s_root = d_alloc_root(root_i);
         if (!sb->s_root)
@@ -546,6 +559,7 @@ int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
 
  out_root_i:
         iput(root_i);
+out_root:
         jffs2_free_ino_caches(c);
         jffs2_free_raw_node_refs(c);
         if (jffs2_blocks_use_vmalloc(c))
@@ -615,9 +629,9 @@ struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
                    jffs2_do_unlink() would need the alloc_sem and we have it.
                    Just iget() it, and if read_inode() is necessary that's OK.
                 */
-                inode = iget(OFNI_BS_2SFFJ(c), inum);
-                if (!inode)
-                        return ERR_PTR(-ENOMEM);
+                inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
+                if (IS_ERR(inode))
+                        return ERR_CAST(inode);
         }
         if (is_bad_inode(inode)) {
                 printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n",
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index bf64686cf098..1b10d2594092 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -175,7 +175,7 @@ extern const struct inode_operations jffs2_symlink_inode_operations;
 /* fs.c */
 int jffs2_setattr (struct dentry *, struct iattr *);
 int jffs2_do_setattr (struct inode *, struct iattr *);
-void jffs2_read_inode (struct inode *);
+struct inode *jffs2_iget(struct super_block *, unsigned long);
 void jffs2_clear_inode (struct inode *);
 void jffs2_dirty_inode(struct inode *inode);
 struct inode *jffs2_new_inode (struct inode *dir_i, int mode,
diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c
index ffa447511e6a..4677355996cc 100644
--- a/fs/jffs2/super.c
+++ b/fs/jffs2/super.c
@@ -65,7 +65,6 @@ static const struct super_operations jffs2_super_operations =
 {
         .alloc_inode =  jffs2_alloc_inode,
         .destroy_inode =jffs2_destroy_inode,
-        .read_inode =   jffs2_read_inode,
         .put_super =    jffs2_put_super,
         .write_super =  jffs2_write_super,
         .statfs =       jffs2_statfs,