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

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

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

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Dave Kleikamp <shaggy@linux.vnet.ibm.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>

diff --git a/fs/jfs/inode.c b/fs/jfs/inode.c
index 4672013..2103397 100644 (file)
--- a/fs/jfs/inode.c
+++ b/fs/jfs/inode.c
@@ -31,11 +31,21 @@
 #include "jfs_debug.h"
 
 
-void jfs_read_inode(struct inode *inode)
+struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
 {
-       if (diRead(inode)) {
-               make_bad_inode(inode);
-               return;
+       struct inode *inode;
+       int ret;
+
+       inode = iget_locked(sb, ino);
+       if (!inode)
+               return ERR_PTR(-ENOMEM);
+       if (!(inode->i_state & I_NEW))
+               return inode;
+
+       ret = diRead(inode);
+       if (ret < 0) {
+               iget_failed(inode);
+               return ERR_PTR(ret);
        }
 
        if (S_ISREG(inode->i_mode)) {
@@ -55,6 +65,8 @@ void jfs_read_inode(struct inode *inode)
                inode->i_op = &jfs_file_inode_operations;
                init_special_inode(inode, inode->i_mode, inode->i_rdev);
        }
+       unlock_new_inode(inode);
+       return inode;
 }
 
 /*

diff --git a/fs/jfs/jfs_inode.h b/fs/jfs/jfs_inode.h
index 8e2cf2c..95a6a11 100644 (file)
--- a/fs/jfs/jfs_inode.h
+++ b/fs/jfs/jfs_inode.h
@@ -24,7 +24,7 @@ extern struct inode *ialloc(struct inode *, umode_t);
 extern int jfs_fsync(struct file *, struct dentry *, int);
 extern int jfs_ioctl(struct inode *, struct file *,
                        unsigned int, unsigned long);
-extern void jfs_read_inode(struct inode *);
+extern struct inode *jfs_iget(struct super_block *, unsigned long);
 extern int jfs_commit_inode(struct inode *, int);
 extern int jfs_write_inode(struct inode*, int);
 extern void jfs_delete_inode(struct inode *);

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index f8718de..403cfc2 100644 (file)
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1462,12 +1462,10 @@ static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struc
                }
        }
 
-       ip = iget(dip->i_sb, inum);
-       if (ip == NULL || is_bad_inode(ip)) {
+       ip = jfs_iget(dip->i_sb, inum);
+       if (IS_ERR(ip)) {
                jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
-               if (ip)
-                       iput(ip);
-               return ERR_PTR(-EACCES);
+               return ERR_CAST(ip);
        }
 
        dentry = d_splice_alias(ip, dentry);
@@ -1485,12 +1483,11 @@ static struct inode *jfs_nfs_get_inode(struct super_block *sb,
 
        if (ino == 0)
                return ERR_PTR(-ESTALE);
-       inode = iget(sb, ino);
-       if (inode == NULL)
-               return ERR_PTR(-ENOMEM);
+       inode = jfs_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);
        }
@@ -1521,17 +1518,14 @@ struct dentry *jfs_get_parent(struct dentry *dentry)
 
        parent_ino =
                le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
-       inode = iget(sb, parent_ino);
-       if (inode) {
-               if (is_bad_inode(inode)) {
+       inode = jfs_iget(sb, parent_ino);
+       if (IS_ERR(inode)) {
+               parent = ERR_CAST(inode);
+       } else {
+               parent = d_alloc_anon(inode);
+               if (!parent) {
+                       parent = ERR_PTR(-ENOMEM);
                        iput(inode);
-                       parent = ERR_PTR(-EACCES);
-               } else {
-                       parent = d_alloc_anon(inode);
-                       if (!parent) {
-                               parent = ERR_PTR(-ENOMEM);
-                               iput(inode);
-                       }
                }
        }
 

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 70a1400..50ea654 100644 (file)
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -414,7 +414,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
        struct inode *inode;
        int rc;
        s64 newLVSize = 0;
-       int flag;
+       int flag, ret = -EINVAL;
 
        jfs_info("In jfs_read_super: s_flags=0x%lx", sb->s_flags);
 
@@ -461,8 +461,10 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
         * Initialize direct-mapping inode/address-space
         */
        inode = new_inode(sb);
-       if (inode == NULL)
+       if (inode == NULL) {
+               ret = -ENOMEM;
                goto out_kfree;
+       }
        inode->i_ino = 0;
        inode->i_nlink = 1;
        inode->i_size = sb->s_bdev->bd_inode->i_size;
@@ -494,9 +496,11 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
 
        sb->s_magic = JFS_SUPER_MAGIC;
 
-       inode = iget(sb, ROOT_I);
-       if (!inode || is_bad_inode(inode))
+       inode = jfs_iget(sb, ROOT_I);
+       if (IS_ERR(inode)) {
+               ret = PTR_ERR(inode);
                goto out_no_root;
+       }
        sb->s_root = d_alloc_root(inode);
        if (!sb->s_root)
                goto out_no_root;
@@ -536,7 +540,7 @@ out_kfree:
        if (sbi->nls_tab)
                unload_nls(sbi->nls_tab);
        kfree(sbi);
-       return -EINVAL;
+       return ret;
 }
 
 static void jfs_write_super_lockfs(struct super_block *sb)
@@ -726,7 +730,6 @@ out:
 static const struct super_operations jfs_super_operations = {
        .alloc_inode    = jfs_alloc_inode,
        .destroy_inode  = jfs_destroy_inode,
-       .read_inode     = jfs_read_inode,
        .dirty_inode    = jfs_dirty_inode,
        .write_inode    = jfs_write_inode,
        .delete_inode   = jfs_delete_inode,