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

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

Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Ian Kent <raven@themaw.net>
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, 37 insertions, 13 deletions

diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h
index 8b4cca3c4705..901a3e67ec45 100644
--- a/fs/autofs/autofs_i.h
+++ b/fs/autofs/autofs_i.h
@@ -150,6 +150,7 @@ extern const struct file_operations autofs_root_operations;
 
 int autofs_fill_super(struct super_block *, void *, int);
 void autofs_kill_sb(struct super_block *sb);
+struct inode *autofs_iget(struct super_block *, unsigned long);
 
 /* Queue management functions */
 
diff --git a/fs/autofs/inode.c b/fs/autofs/inode.c
index 45f5992a0957..708bdb89fea1 100644
--- a/fs/autofs/inode.c
+++ b/fs/autofs/inode.c
@@ -52,10 +52,7 @@ out_kill_sb:
         kill_anon_super(sb);
 }
 
-static void autofs_read_inode(struct inode *inode);
-
 static const struct super_operations autofs_sops = {
-        .read_inode     = autofs_read_inode,
         .statfs         = simple_statfs,
 };
 
@@ -164,7 +161,9 @@ int autofs_fill_super(struct super_block *s, void *data, int silent)
         s->s_time_gran = 1;
         sbi->sb = s;
 
-        root_inode = iget(s, AUTOFS_ROOT_INO);
+        root_inode = autofs_iget(s, AUTOFS_ROOT_INO);
+        if (IS_ERR(root_inode))
+                goto fail_free;
         root = d_alloc_root(root_inode);
         pipe = NULL;
 
@@ -230,11 +229,17 @@ fail_unlock:
         return -EINVAL;
 }
 
-static void autofs_read_inode(struct inode *inode)
+struct inode *autofs_iget(struct super_block *sb, unsigned long ino)
 {
-        ino_t ino = inode->i_ino;
         unsigned int n;
-        struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
+        struct autofs_sb_info *sbi = autofs_sbi(sb);
+        struct inode *inode;
+
+        inode = iget_locked(sb, ino);
+        if (!inode)
+                return ERR_PTR(-ENOMEM);
+        if (!(inode->i_state & I_NEW))
+                return inode;
 
         /* Initialize to the default case (stub directory) */
 
@@ -250,7 +255,7 @@ static void autofs_read_inode(struct inode *inode)
                 inode->i_op = &autofs_root_inode_operations;
                 inode->i_fop = &autofs_root_operations;
                 inode->i_uid = inode->i_gid = 0; /* Changed in read_super */
-                return;
+                goto done;
         } 
         
         inode->i_uid = inode->i_sb->s_root->d_inode->i_uid;
@@ -263,7 +268,7 @@ static void autofs_read_inode(struct inode *inode)
                 n = ino - AUTOFS_FIRST_SYMLINK;
                 if (n >= AUTOFS_MAX_SYMLINKS || !test_bit(n,sbi->symlink_bitmap)) {
                         printk("autofs: Looking for bad symlink inode %u\n", (unsigned int) ino);
-                        return;
+                        goto done;
                 }
                 
                 inode->i_op = &autofs_symlink_inode_operations;
@@ -275,4 +280,8 @@ static void autofs_read_inode(struct inode *inode)
                 inode->i_size = sl->len;
                 inode->i_nlink = 1;
         }
+
+done:
+        unlock_new_inode(inode);
+        return inode;
 }
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 5efff3c0d886..8aacade56956 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -114,8 +114,8 @@ static int try_to_fill_dentry(struct dentry *dentry, struct super_block *sb, str
         dentry->d_time = (unsigned long) ent;
         
         if (!dentry->d_inode) {
-                inode = iget(sb, ent->ino);
-                if (!inode) {
+                inode = autofs_iget(sb, ent->ino);
+                if (IS_ERR(inode)) {
                         /* Failed, but leave pending for next time */
                         return 1;
                 }
@@ -274,6 +274,7 @@ static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const c
         unsigned int n;
         int slsize;
         struct autofs_symlink *sl;
+        struct inode *inode;
 
         DPRINTK(("autofs_root_symlink: %s <- ", symname));
         autofs_say(dentry->d_name.name,dentry->d_name.len);
@@ -331,7 +332,12 @@ static int autofs_root_symlink(struct inode *dir, struct dentry *dentry, const c
         ent->dentry = NULL;     /* We don't keep the dentry for symlinks */
 
         autofs_hash_insert(dh,ent);
-        d_instantiate(dentry, iget(dir->i_sb,ent->ino));
+
+        inode = autofs_iget(dir->i_sb, ent->ino);
+        if (IS_ERR(inode))
+                return PTR_ERR(inode);
+
+        d_instantiate(dentry, inode);
         unlock_kernel();
         return 0;
 }
@@ -428,6 +434,7 @@ static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         struct autofs_sb_info *sbi = autofs_sbi(dir->i_sb);
         struct autofs_dirhash *dh = &sbi->dirhash;
         struct autofs_dir_ent *ent;
+        struct inode *inode;
         ino_t ino;
 
         lock_kernel();
@@ -469,7 +476,14 @@ static int autofs_root_mkdir(struct inode *dir, struct dentry *dentry, int mode)
         autofs_hash_insert(dh,ent);
 
         inc_nlink(dir);
-        d_instantiate(dentry, iget(dir->i_sb,ino));
+
+        inode = autofs_iget(dir->i_sb, ino);
+        if (IS_ERR(inode)) {
+                drop_nlink(dir);
+                return PTR_ERR(inode);
+        }
+
+        d_instantiate(dentry, inode);
         unlock_kernel();
 
         return 0;