iget: stop the MINIX filesystem from using iget() and read_inode()

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

minix_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>

3 files changed, 33 insertions, 18 deletions

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index bf4cd316af81..84f6242ba6fc 100644
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -18,7 +18,6 @@
 #include <linux/highuid.h>
 #include <linux/vfs.h>
 
-static void minix_read_inode(struct inode * inode);
 static int minix_write_inode(struct inode * inode, int wait);
 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf);
 static int minix_remount (struct super_block * sb, int * flags, char * data);
@@ -96,7 +95,6 @@ static void destroy_inodecache(void)
 static const struct super_operations minix_sops = {
         .alloc_inode    = minix_alloc_inode,
         .destroy_inode  = minix_destroy_inode,
-        .read_inode     = minix_read_inode,
         .write_inode    = minix_write_inode,
         .delete_inode   = minix_delete_inode,
         .put_super      = minix_put_super,
@@ -149,6 +147,7 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)
         unsigned long i, block;
         struct inode *root_inode;
         struct minix_sb_info *sbi;
+        int ret = -EINVAL;
 
         sbi = kzalloc(sizeof(struct minix_sb_info), GFP_KERNEL);
         if (!sbi)
@@ -246,10 +245,13 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)
 
         /* set up enough so that it can read an inode */
         s->s_op = &minix_sops;
-        root_inode = iget(s, MINIX_ROOT_INO);
-        if (!root_inode || is_bad_inode(root_inode))
+        root_inode = minix_iget(s, MINIX_ROOT_INO);
+        if (IS_ERR(root_inode)) {
+                ret = PTR_ERR(root_inode);
                 goto out_no_root;
+        }
 
+        ret = -ENOMEM;
         s->s_root = d_alloc_root(root_inode);
         if (!s->s_root)
                 goto out_iput;
@@ -290,6 +292,7 @@ out_freemap:
         goto out_release;
 
 out_no_map:
+        ret = -ENOMEM;
         if (!silent)
                 printk("MINIX-fs: can't allocate map\n");
         goto out_release;
@@ -316,7 +319,7 @@ out_bad_sb:
 out:
         s->s_fs_info = NULL;
         kfree(sbi);
-        return -EINVAL;
+        return ret;
 }
 
 static int minix_statfs(struct dentry *dentry, struct kstatfs *buf)
@@ -409,7 +412,7 @@ void minix_set_inode(struct inode *inode, dev_t rdev)
 /*
  * The minix V1 function to read an inode.
  */
-static void V1_minix_read_inode(struct inode * inode)
+static struct inode *V1_minix_iget(struct inode *inode)
 {
         struct buffer_head * bh;
         struct minix_inode * raw_inode;
@@ -418,8 +421,8 @@ static void V1_minix_read_inode(struct inode * inode)
 
         raw_inode = minix_V1_raw_inode(inode->i_sb, inode->i_ino, &bh);
         if (!raw_inode) {
-                make_bad_inode(inode);
-                return;
+                iget_failed(inode);
+                return ERR_PTR(-EIO);
         }
         inode->i_mode = raw_inode->i_mode;
         inode->i_uid = (uid_t)raw_inode->i_uid;
@@ -435,12 +438,14 @@ static void V1_minix_read_inode(struct inode * inode)
                 minix_inode->u.i1_data[i] = raw_inode->i_zone[i];
         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
         brelse(bh);
+        unlock_new_inode(inode);
+        return inode;
 }
 
 /*
  * The minix V2 function to read an inode.
  */
-static void V2_minix_read_inode(struct inode * inode)
+static struct inode *V2_minix_iget(struct inode *inode)
 {
         struct buffer_head * bh;
         struct minix2_inode * raw_inode;
@@ -449,8 +454,8 @@ static void V2_minix_read_inode(struct inode * inode)
 
         raw_inode = minix_V2_raw_inode(inode->i_sb, inode->i_ino, &bh);
         if (!raw_inode) {
-                make_bad_inode(inode);
-                return;
+                iget_failed(inode);
+                return ERR_PTR(-EIO);
         }
         inode->i_mode = raw_inode->i_mode;
         inode->i_uid = (uid_t)raw_inode->i_uid;
@@ -468,17 +473,27 @@ static void V2_minix_read_inode(struct inode * inode)
                 minix_inode->u.i2_data[i] = raw_inode->i_zone[i];
         minix_set_inode(inode, old_decode_dev(raw_inode->i_zone[0]));
         brelse(bh);
+        unlock_new_inode(inode);
+        return inode;
 }
 
 /*
  * The global function to read an inode.
  */
-static void minix_read_inode(struct inode * inode)
+struct inode *minix_iget(struct super_block *sb, unsigned long ino)
 {
+        struct inode *inode;
+
+        inode = iget_locked(sb, ino);
+        if (!inode)
+                return ERR_PTR(-ENOMEM);
+        if (!(inode->i_state & I_NEW))
+                return inode;
+
         if (INODE_VERSION(inode) == MINIX_V1)
-                V1_minix_read_inode(inode);
+                return V1_minix_iget(inode);
         else
-                V2_minix_read_inode(inode);
+                return V2_minix_iget(inode);
 }
 
 /*
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index ac5d3a75cb0d..326edfe96108 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -45,6 +45,7 @@ struct minix_sb_info {
         unsigned short s_version;
 };
 
+extern struct inode *minix_iget(struct super_block *, unsigned long);
 extern struct minix_inode * minix_V1_raw_inode(struct super_block *, ino_t, struct buffer_head **);
 extern struct minix2_inode * minix_V2_raw_inode(struct super_block *, ino_t, struct buffer_head **);
 extern struct inode * minix_new_inode(const struct inode * dir, int * error);
diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index f4aa7a939040..102241bc9c79 100644
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -54,10 +54,9 @@ static struct dentry *minix_lookup(struct inode * dir, struct dentry *dentry, st
 
         ino = minix_inode_by_name(dentry);
         if (ino) {
-                inode = iget(dir->i_sb, ino);
- 
-                if (!inode)
-                        return ERR_PTR(-EACCES);
+                inode = minix_iget(dir->i_sb, ino);
+                if (IS_ERR(inode))
+                        return ERR_CAST(inode);
         }
         d_add(dentry, inode);
         return NULL;