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

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

efs_fill_super() returns any error incurred when getting the root inode
instead of EACCES.

[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, 40 insertions, 24 deletions

diff --git a/fs/efs/inode.c b/fs/efs/inode.c
index 174696f9bf14..627c3026946d 100644
--- a/fs/efs/inode.c
+++ b/fs/efs/inode.c
@@ -45,17 +45,26 @@ static inline void extent_copy(efs_extent *src, efs_extent *dst) {
         return;
 }
 
-void efs_read_inode(struct inode *inode)
+struct inode *efs_iget(struct super_block *super, unsigned long ino)
 {
         int i, inode_index;
         dev_t device;
         u32 rdev;
         struct buffer_head *bh;
-        struct efs_sb_info    *sb = SUPER_INFO(inode->i_sb);
-        struct efs_inode_info *in = INODE_INFO(inode);
+        struct efs_sb_info    *sb = SUPER_INFO(super);
+        struct efs_inode_info *in;
         efs_block_t block, offset;
         struct efs_dinode *efs_inode;
-  
+        struct inode *inode;
+
+        inode = iget_locked(super, ino);
+        if (IS_ERR(inode))
+                return ERR_PTR(-ENOMEM);
+        if (!(inode->i_state & I_NEW))
+                return inode;
+
+        in = INODE_INFO(inode);
+
         /*
         ** EFS layout:
         **
@@ -159,13 +168,13 @@ void efs_read_inode(struct inode *inode)
                         break;
         }
 
-        return;
+        unlock_new_inode(inode);
+        return inode;
         
 read_inode_error:
         printk(KERN_WARNING "EFS: failed to read inode %lu\n", inode->i_ino);
-        make_bad_inode(inode);
-
-        return;
+        iget_failed(inode);
+        return ERR_PTR(-EIO);
 }
 
 static inline efs_block_t
diff --git a/fs/efs/namei.c b/fs/efs/namei.c
index f7f407075be1..e26704742d41 100644
--- a/fs/efs/namei.c
+++ b/fs/efs/namei.c
@@ -66,9 +66,10 @@ struct dentry *efs_lookup(struct inode *dir, struct dentry *dentry, struct namei
         lock_kernel();
         inodenum = efs_find_entry(dir, dentry->d_name.name, dentry->d_name.len);
         if (inodenum) {
-                if (!(inode = iget(dir->i_sb, inodenum))) {
+                inode = efs_iget(dir->i_sb, inodenum);
+                if (IS_ERR(inode)) {
                         unlock_kernel();
-                        return ERR_PTR(-EACCES);
+                        return ERR_CAST(inode);
                 }
         }
         unlock_kernel();
@@ -84,12 +85,11 @@ static struct inode *efs_nfs_get_inode(struct super_block *sb, u64 ino,
 
         if (ino == 0)
                 return ERR_PTR(-ESTALE);
-        inode = iget(sb, ino);
-        if (inode == NULL)
-                return ERR_PTR(-ENOMEM);
+        inode = efs_iget(sb, ino);
+        if (IS_ERR(inode))
+                return ERR_CAST(inode);
 
-        if (is_bad_inode(inode) ||
-            (generation && inode->i_generation != generation)) {
+        if (generation && inode->i_generation != generation) {
                 iput(inode);
                 return ERR_PTR(-ESTALE);
         }
@@ -116,7 +116,7 @@ struct dentry *efs_get_parent(struct dentry *child)
         struct dentry *parent;
         struct inode *inode;
         efs_ino_t ino;
-        int error;
+        long error;
 
         lock_kernel();
 
@@ -125,10 +125,11 @@ struct dentry *efs_get_parent(struct dentry *child)
         if (!ino)
                 goto fail;
 
-        error = -EACCES;
-        inode = iget(child->d_inode->i_sb, ino);
-        if (!inode)
+        inode = efs_iget(child->d_inode->i_sb, ino);
+        if (IS_ERR(inode)) {
+                error = PTR_ERR(inode);
                 goto fail;
+        }
 
         error = -ENOMEM;
         parent = d_alloc_anon(inode);
diff --git a/fs/efs/super.c b/fs/efs/super.c
index c79bc627f107..14082405cdd1 100644
--- a/fs/efs/super.c
+++ b/fs/efs/super.c
@@ -107,7 +107,6 @@ static int efs_remount(struct super_block *sb, int *flags, char *data)
 static const struct super_operations efs_superblock_operations = {
         .alloc_inode    = efs_alloc_inode,
         .destroy_inode  = efs_destroy_inode,
-        .read_inode     = efs_read_inode,
         .put_super      = efs_put_super,
         .statfs         = efs_statfs,
         .remount_fs     = efs_remount,
@@ -247,6 +246,7 @@ static int efs_fill_super(struct super_block *s, void *d, int silent)
         struct efs_sb_info *sb;
         struct buffer_head *bh;
         struct inode *root;
+        int ret = -EINVAL;
 
         sb = kzalloc(sizeof(struct efs_sb_info), GFP_KERNEL);
         if (!sb)
@@ -303,12 +303,18 @@ static int efs_fill_super(struct super_block *s, void *d, int silent)
         }
         s->s_op   = &efs_superblock_operations;
         s->s_export_op = &efs_export_ops;
-        root = iget(s, EFS_ROOTINODE);
+        root = efs_iget(s, EFS_ROOTINODE);
+        if (IS_ERR(root)) {
+                printk(KERN_ERR "EFS: get root inode failed\n");
+                ret = PTR_ERR(root);
+                goto out_no_fs;
+        }
+
         s->s_root = d_alloc_root(root);
- 
         if (!(s->s_root)) {
-                printk(KERN_ERR "EFS: get root inode failed\n");
+                printk(KERN_ERR "EFS: get root dentry failed\n");
                 iput(root);
+                ret = -ENOMEM;
                 goto out_no_fs;
         }
 
@@ -318,7 +324,7 @@ out_no_fs_ul:
 out_no_fs:
         s->s_fs_info = NULL;
         kfree(sb);
-        return -EINVAL;
+        return ret;
 }
 
 static int efs_statfs(struct dentry *dentry, struct kstatfs *buf) {