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

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

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

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: David Howells <dhowells@redhat.com>
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>

1 files changed, 32 insertions, 14 deletions

diff --git a/fs/romfs/inode.c b/fs/romfs/inode.c
index a49cf5b9a19..00b6f0a518c 100644
--- a/fs/romfs/inode.c
+++ b/fs/romfs/inode.c
@@ -84,6 +84,8 @@ struct romfs_inode_info {
         struct inode vfs_inode;
 };
 
+static struct inode *romfs_iget(struct super_block *, unsigned long);
+
 /* instead of private superblock data */
 static inline unsigned long romfs_maxsize(struct super_block *sb)
 {
@@ -117,7 +119,7 @@ static int romfs_fill_super(struct super_block *s, void *data, int silent)
         struct buffer_head *bh;
         struct romfs_super_block *rsb;
         struct inode *root;
-        int sz;
+        int sz, ret = -EINVAL;
 
         /* I would parse the options here, but there are none.. :) */
 
@@ -157,10 +159,13 @@ static int romfs_fill_super(struct super_block *s, void *data, int silent)
              & ROMFH_MASK;
 
         s->s_op = &romfs_ops;
-        root = iget(s, sz);
-        if (!root)
+        root = romfs_iget(s, sz);
+        if (IS_ERR(root)) {
+                ret = PTR_ERR(root);
                 goto out;
+        }
 
+        ret = -ENOMEM;
         s->s_root = d_alloc_root(root);
         if (!s->s_root)
                 goto outiput;
@@ -173,7 +178,7 @@ outiput:
 out:
         brelse(bh);
 outnobh:
-        return -EINVAL;
+        return ret;
 }
 
 /* That's simple too. */
@@ -389,8 +394,11 @@ romfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
         if ((be32_to_cpu(ri.next) & ROMFH_TYPE) == ROMFH_HRD)
                 offset = be32_to_cpu(ri.spec) & ROMFH_MASK;
 
-        if ((inode = iget(dir->i_sb, offset)))
-                goto outi;
+        inode = romfs_iget(dir->i_sb, offset);
+        if (IS_ERR(inode)) {
+                res = PTR_ERR(inode);
+                goto out;
+        }
 
         /*
          * it's a bit funky, _lookup needs to return an error code
@@ -402,7 +410,7 @@ romfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
          */
 
 out0:   inode = NULL;
-outi:   res = 0;
+        res = 0;
         d_add (dentry, inode);
 
 out:    unlock_kernel();
@@ -478,20 +486,29 @@ static mode_t romfs_modemap[] =
         S_IFBLK+0600, S_IFCHR+0600, S_IFSOCK+0644, S_IFIFO+0644
 };
 
-static void
-romfs_read_inode(struct inode *i)
+static struct inode *
+romfs_iget(struct super_block *sb, unsigned long ino)
 {
-        int nextfh, ino;
+        int nextfh;
         struct romfs_inode ri;
+        struct inode *i;
+
+        ino &= ROMFH_MASK;
+        i = iget_locked(sb, ino);
+        if (!i)
+                return ERR_PTR(-ENOMEM);
+        if (!(i->i_state & I_NEW))
+                return i;
 
-        ino = i->i_ino & ROMFH_MASK;
         i->i_mode = 0;
 
         /* Loop for finding the real hard link */
         for(;;) {
                 if (romfs_copyfrom(i, &ri, ino, ROMFH_SIZE) <= 0) {
-                        printk("romfs: read error for inode 0x%x\n", ino);
-                        return;
+                        printk(KERN_ERR "romfs: read error for inode 0x%lx\n",
+                                ino);
+                        iget_failed(i);
+                        return ERR_PTR(-EIO);
                 }
                 /* XXX: do romfs_checksum here too (with name) */
 
@@ -548,6 +565,8 @@ romfs_read_inode(struct inode *i)
                         init_special_inode(i, ino,
                                         MKDEV(nextfh>>16,nextfh&0xffff));
         }
+        unlock_new_inode(i);
+        return i;
 }
 
 static struct kmem_cache * romfs_inode_cachep;
@@ -599,7 +618,6 @@ static int romfs_remount(struct super_block *sb, int *flags, char *data)
 static const struct super_operations romfs_ops = {
         .alloc_inode    = romfs_alloc_inode,
         .destroy_inode  = romfs_destroy_inode,
-        .read_inode     = romfs_read_inode,
         .statfs         = romfs_statfs,
         .remount_fs     = romfs_remount,
 };