iget: stop EXT4 from using iget() and read_inode()

Stop the EXT4 filesystem from using iget() and read_inode().  Replace
ext4_read_inode() with ext4_iget(), and call that instead of iget().
ext4_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

ext4_fill_super() returns any error incurred when getting the root inode
instead of EINVAL.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: "Theodore Ts'o" <tytso@mit.edu>
Acked-by: Jan Kara <jack@suse.cz>
Cc: <linux-ext4@vger.kernel.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>

1 files changed, 35 insertions, 23 deletions

diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 575b5215c808..da18a74b966a 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -782,14 +782,15 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
         unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
         ext4_group_t block_group;
         int bit;
-        struct buffer_head *bitmap_bh = NULL;
+        struct buffer_head *bitmap_bh;
         struct inode *inode = NULL;
+        long err = -EIO;
 
         /* Error cases - e2fsck has already cleaned up for us */
         if (ino > max_ino) {
                 ext4_warning(sb, __FUNCTION__,
                              "bad orphan ino %lu!  e2fsck was run?", ino);
-                goto out;
+                goto error;
         }
 
         block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
@@ -798,38 +799,49 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
         if (!bitmap_bh) {
                 ext4_warning(sb, __FUNCTION__,
                              "inode bitmap error for orphan %lu", ino);
-                goto out;
+                goto error;
         }
 
         /* Having the inode bit set should be a 100% indicator that this
          * is a valid orphan (no e2fsck run on fs).  Orphans also include
          * inodes that were being truncated, so we can't check i_nlink==0.
          */
-        if (!ext4_test_bit(bit, bitmap_bh->b_data) ||
-                        !(inode = iget(sb, ino)) || is_bad_inode(inode) ||
-                        NEXT_ORPHAN(inode) > max_ino) {
-                ext4_warning(sb, __FUNCTION__,
-                             "bad orphan inode %lu!  e2fsck was run?", ino);
-                printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
-                       bit, (unsigned long long)bitmap_bh->b_blocknr,
-                       ext4_test_bit(bit, bitmap_bh->b_data));
-                printk(KERN_NOTICE "inode=%p\n", inode);
-                if (inode) {
-                        printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
-                               is_bad_inode(inode));
-                        printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
-                               NEXT_ORPHAN(inode));
-                        printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
-                }
+        if (!ext4_test_bit(bit, bitmap_bh->b_data))
+                goto bad_orphan;
+
+        inode = ext4_iget(sb, ino);
+        if (IS_ERR(inode))
+                goto iget_failed;
+
+        if (NEXT_ORPHAN(inode) > max_ino)
+                goto bad_orphan;
+        brelse(bitmap_bh);
+        return inode;
+
+iget_failed:
+        err = PTR_ERR(inode);
+        inode = NULL;
+bad_orphan:
+        ext4_warning(sb, __FUNCTION__,
+                     "bad orphan inode %lu!  e2fsck was run?", ino);
+        printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
+               bit, (unsigned long long)bitmap_bh->b_blocknr,
+               ext4_test_bit(bit, bitmap_bh->b_data));
+        printk(KERN_NOTICE "inode=%p\n", inode);
+        if (inode) {
+                printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
+                       is_bad_inode(inode));
+                printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
+                       NEXT_ORPHAN(inode));
+                printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
                 /* Avoid freeing blocks if we got a bad deleted inode */
-                if (inode && inode->i_nlink == 0)
+                if (inode->i_nlink == 0)
                         inode->i_blocks = 0;
                 iput(inode);
-                inode = NULL;
         }
-out:
         brelse(bitmap_bh);
-        return inode;
+error:
+        return ERR_PTR(err);
 }
 
 unsigned long ext4_count_free_inodes (struct super_block * sb)