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

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

ufs_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>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
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, 33 insertions, 23 deletions

diff --git a/fs/ufs/inode.c b/fs/ufs/inode.c
index 4320782761ae..489f26bc26d9 100644
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -714,26 +714,30 @@ static int ufs2_read_inode(struct inode *inode, struct ufs2_inode *ufs2_inode)
         return 0;
 }
 
-void ufs_read_inode(struct inode * inode)
+struct inode *ufs_iget(struct super_block *sb, unsigned long ino)
 {
-        struct ufs_inode_info *ufsi = UFS_I(inode);
-        struct super_block * sb;
-        struct ufs_sb_private_info * uspi;
+        struct ufs_inode_info *ufsi;
+        struct ufs_sb_private_info *uspi = UFS_SB(sb)->s_uspi;
         struct buffer_head * bh;
+        struct inode *inode;
         int err;
 
-        UFSD("ENTER, ino %lu\n", inode->i_ino);
-
-        sb = inode->i_sb;
-        uspi = UFS_SB(sb)->s_uspi;
+        UFSD("ENTER, ino %lu\n", ino);
 
-        if (inode->i_ino < UFS_ROOTINO ||
-            inode->i_ino > (uspi->s_ncg * uspi->s_ipg)) {
+        if (ino < UFS_ROOTINO || ino > (uspi->s_ncg * uspi->s_ipg)) {
                 ufs_warning(sb, "ufs_read_inode", "bad inode number (%lu)\n",
-                            inode->i_ino);
-                goto bad_inode;
+                            ino);
+                return ERR_PTR(-EIO);
         }
 
+        inode = iget_locked(sb, ino);
+        if (!inode)
+                return ERR_PTR(-ENOMEM);
+        if (!(inode->i_state & I_NEW))
+                return inode;
+
+        ufsi = UFS_I(inode);
+
         bh = sb_bread(sb, uspi->s_sbbase + ufs_inotofsba(inode->i_ino));
         if (!bh) {
                 ufs_warning(sb, "ufs_read_inode", "unable to read inode %lu\n",
@@ -765,10 +769,12 @@ void ufs_read_inode(struct inode * inode)
         brelse(bh);
 
         UFSD("EXIT\n");
-        return;
+        unlock_new_inode(inode);
+        return inode;
 
 bad_inode:
-        make_bad_inode(inode);
+        iget_failed(inode);
+        return ERR_PTR(-EIO);
 }
 
 static void ufs1_update_inode(struct inode *inode, struct ufs_inode *ufs_inode)
diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index d8bfbee2fe2b..747a4de6c695 100644
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -57,10 +57,10 @@ static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, stru
         lock_kernel();
         ino = ufs_inode_by_name(dir, dentry);
         if (ino) {
-                inode = iget(dir->i_sb, ino);
-                if (!inode) {
+                inode = ufs_iget(dir->i_sb, ino);
+                if (IS_ERR(inode)) {
                         unlock_kernel();
-                        return ERR_PTR(-EACCES);
+                        return ERR_CAST(inode);
                 }
         }
         unlock_kernel();
diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 0072cb33ebec..73deff475e63 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -633,6 +633,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
         unsigned block_size, super_block_size;
         unsigned flags;
         unsigned super_block_offset;
+        int ret = -EINVAL;
 
         uspi = NULL;
         ubh = NULL;
@@ -1065,12 +1066,16 @@ magic_found:
                 uspi->s_maxsymlinklen =
                     fs32_to_cpu(sb, usb3->fs_un2.fs_44.fs_maxsymlinklen);
 
-        inode = iget(sb, UFS_ROOTINO);
-        if (!inode || is_bad_inode(inode))
+        inode = ufs_iget(sb, UFS_ROOTINO);
+        if (IS_ERR(inode)) {
+                ret = PTR_ERR(inode);
                 goto failed;
+        }
         sb->s_root = d_alloc_root(inode);
-        if (!sb->s_root)
+        if (!sb->s_root) {
+                ret = -ENOMEM;
                 goto dalloc_failed;
+        }
 
         ufs_setup_cstotal(sb);
         /*
@@ -1092,7 +1097,7 @@ failed:
         kfree(sbi);
         sb->s_fs_info = NULL;
         UFSD("EXIT (FAILED)\n");
-        return -EINVAL;
+        return ret;
 
 failed_nomem:
         UFSD("EXIT (NOMEM)\n");
@@ -1326,7 +1331,6 @@ static ssize_t ufs_quota_write(struct super_block *, int, const char *, size_t,
 static const struct super_operations ufs_super_ops = {
         .alloc_inode    = ufs_alloc_inode,
         .destroy_inode  = ufs_destroy_inode,
-        .read_inode     = ufs_read_inode,
         .write_inode    = ufs_write_inode,
         .delete_inode   = ufs_delete_inode,
         .put_super      = ufs_put_super,
diff --git a/fs/ufs/ufs.h b/fs/ufs/ufs.h
index 7faa4cd71a27..fcb9231bb9ed 100644
--- a/fs/ufs/ufs.h
+++ b/fs/ufs/ufs.h
@@ -106,7 +106,7 @@ extern void ufs_free_inode (struct inode *inode);
 extern struct inode * ufs_new_inode (struct inode *, int);
 
 /* inode.c */
-extern void ufs_read_inode (struct inode *);
+extern struct inode *ufs_iget(struct super_block *, unsigned long);
 extern void ufs_put_inode (struct inode *);
 extern int ufs_write_inode (struct inode *, int);
 extern int ufs_sync_inode (struct inode *);