From: akpm@linux-foundation.org Subject: [patch 135/208] iget: stop EXT2 from using iget() and read_inode() Date: Thu, 07 Feb 2008 00:15:35 -0800 Message-ID: <200802070815.m178FGft024117@imap1.linux-foundation.org> Cc: akpm@linux-foundation.org, dhowells@redhat.com, hch@lst.de, linux-ext4@vger.kernel.org, tytso@mit.edu To: torvalds@linux-foundation.org Return-path: Received: from smtp2.linux-foundation.org ([207.189.120.14]:51613 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754660AbYBGI04 (ORCPT ); Thu, 7 Feb 2008 03:26:56 -0500 Sender: linux-ext4-owner@vger.kernel.org List-ID: From: David Howells Stop the EXT2 filesystem from using iget() and read_inode(). Replace ext2_read_inode() with ext2_iget(), and call that instead of iget(). ext2_iget() then uses iget_locked() directly and returns a proper error code instead of an inode in the event of an error. ext2_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 Acked-by: "Theodore Ts'o" Cc: Acked-by: Christoph Hellwig Signed-off-by: Andrew Morton --- fs/ext2/ext2.h | 2 +- fs/ext2/inode.c | 29 +++++++++++++++++++++-------- fs/ext2/namei.c | 12 ++++++------ fs/ext2/super.c | 32 ++++++++++++++++++-------------- 4 files changed, 46 insertions(+), 29 deletions(-) diff -puN fs/ext2/ext2.h~iget-stop-ext2-from-using-iget-and-read_inode-try fs/ext2/ext2.h --- a/fs/ext2/ext2.h~iget-stop-ext2-from-using-iget-and-read_inode-try +++ a/fs/ext2/ext2.h @@ -124,7 +124,7 @@ extern void ext2_check_inodes_bitmap (st extern unsigned long ext2_count_free (struct buffer_head *, unsigned); /* inode.c */ -extern void ext2_read_inode (struct inode *); +extern struct inode *ext2_iget (struct super_block *, unsigned long); extern int ext2_write_inode (struct inode *, int); extern void ext2_put_inode (struct inode *); extern void ext2_delete_inode (struct inode *); diff -puN fs/ext2/inode.c~iget-stop-ext2-from-using-iget-and-read_inode-try fs/ext2/inode.c --- a/fs/ext2/inode.c~iget-stop-ext2-from-using-iget-and-read_inode-try +++ a/fs/ext2/inode.c @@ -1181,22 +1181,33 @@ void ext2_get_inode_flags(struct ext2_in ei->i_flags |= EXT2_DIRSYNC_FL; } -void ext2_read_inode (struct inode * inode) +struct inode *ext2_iget (struct super_block *sb, unsigned long ino) { - struct ext2_inode_info *ei = EXT2_I(inode); - ino_t ino = inode->i_ino; + struct ext2_inode_info *ei; struct buffer_head * bh; - struct ext2_inode * raw_inode = ext2_get_inode(inode->i_sb, ino, &bh); + struct ext2_inode *raw_inode; + struct inode *inode; + long ret = -EIO; int n; + inode = iget_locked(sb, ino); + if (!inode) + return ERR_PTR(-ENOMEM); + if (!(inode->i_state & I_NEW)) + return inode; + + ei = EXT2_I(inode); #ifdef CONFIG_EXT2_FS_POSIX_ACL ei->i_acl = EXT2_ACL_NOT_CACHED; ei->i_default_acl = EXT2_ACL_NOT_CACHED; #endif ei->i_block_alloc_info = NULL; - if (IS_ERR(raw_inode)) + raw_inode = ext2_get_inode(inode->i_sb, ino, &bh); + if (IS_ERR(raw_inode)) { + ret = PTR_ERR(raw_inode); goto bad_inode; + } inode->i_mode = le16_to_cpu(raw_inode->i_mode); inode->i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); @@ -1220,6 +1231,7 @@ void ext2_read_inode (struct inode * ino if (inode->i_nlink == 0 && (inode->i_mode == 0 || ei->i_dtime)) { /* this inode is deleted */ brelse (bh); + ret = -ESTALE; goto bad_inode; } inode->i_blocks = le32_to_cpu(raw_inode->i_blocks); @@ -1286,11 +1298,12 @@ void ext2_read_inode (struct inode * ino } brelse (bh); ext2_set_inode_flags(inode); - return; + unlock_new_inode(inode); + return inode; bad_inode: - make_bad_inode(inode); - return; + iget_failed(inode); + return ERR_PTR(ret); } static int ext2_update_inode(struct inode * inode, int do_sync) diff -puN fs/ext2/namei.c~iget-stop-ext2-from-using-iget-and-read_inode-try fs/ext2/namei.c --- a/fs/ext2/namei.c~iget-stop-ext2-from-using-iget-and-read_inode-try +++ a/fs/ext2/namei.c @@ -63,9 +63,9 @@ static struct dentry *ext2_lookup(struct ino = ext2_inode_by_name(dir, dentry); inode = NULL; if (ino) { - inode = iget(dir->i_sb, ino); - if (!inode) - return ERR_PTR(-EACCES); + inode = ext2_iget(dir->i_sb, ino); + if (IS_ERR(inode)) + return ERR_CAST(inode); } return d_splice_alias(inode, dentry); } @@ -83,10 +83,10 @@ struct dentry *ext2_get_parent(struct de ino = ext2_inode_by_name(child->d_inode, &dotdot); if (!ino) return ERR_PTR(-ENOENT); - inode = iget(child->d_inode->i_sb, ino); + inode = ext2_iget(child->d_inode->i_sb, ino); - if (!inode) - return ERR_PTR(-EACCES); + if (IS_ERR(inode)) + return ERR_CAST(inode); parent = d_alloc_anon(inode); if (!parent) { iput(inode); diff -puN fs/ext2/super.c~iget-stop-ext2-from-using-iget-and-read_inode-try fs/ext2/super.c --- a/fs/ext2/super.c~iget-stop-ext2-from-using-iget-and-read_inode-try +++ a/fs/ext2/super.c @@ -296,7 +296,6 @@ static ssize_t ext2_quota_write(struct s static const struct super_operations ext2_sops = { .alloc_inode = ext2_alloc_inode, .destroy_inode = ext2_destroy_inode, - .read_inode = ext2_read_inode, .write_inode = ext2_write_inode, .delete_inode = ext2_delete_inode, .put_super = ext2_put_super, @@ -326,11 +325,10 @@ static struct inode *ext2_nfs_get_inode( * it might be "neater" to call ext2_get_inode first and check * if the inode is valid..... */ - inode = iget(sb, ino); - if (inode == NULL) - return ERR_PTR(-ENOMEM); - if (is_bad_inode(inode) || - (generation && inode->i_generation != generation)) { + inode = ext2_iget(sb, ino); + if (IS_ERR(inode)) + return ERR_CAST(inode); + if (generation && inode->i_generation != generation) { /* we didn't find the right inode.. */ iput(inode); return ERR_PTR(-ESTALE); @@ -746,6 +744,7 @@ static int ext2_fill_super(struct super_ unsigned long logic_sb_block; unsigned long offset = 0; unsigned long def_mount_opts; + long ret = -EINVAL; int blocksize = BLOCK_SIZE; int db_count; int i, j; @@ -1041,19 +1040,24 @@ static int ext2_fill_super(struct super_ sb->s_op = &ext2_sops; sb->s_export_op = &ext2_export_ops; sb->s_xattr = ext2_xattr_handlers; - root = iget(sb, EXT2_ROOT_INO); - sb->s_root = d_alloc_root(root); - if (!sb->s_root) { - iput(root); - printk(KERN_ERR "EXT2-fs: get root inode failed\n"); + root = ext2_iget(sb, EXT2_ROOT_INO); + if (IS_ERR(root)) { + ret = PTR_ERR(root); goto failed_mount3; } if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { - dput(sb->s_root); - sb->s_root = NULL; + iput(root); printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); goto failed_mount3; } + + sb->s_root = d_alloc_root(root); + if (!sb->s_root) { + iput(root); + printk(KERN_ERR "EXT2-fs: get root inode failed\n"); + ret = -ENOMEM; + goto failed_mount3; + } if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) ext2_warning(sb, __FUNCTION__, "mounting ext3 filesystem as ext2"); @@ -1080,7 +1084,7 @@ failed_mount: failed_sbi: sb->s_fs_info = NULL; kfree(sbi); - return -EINVAL; + return ret; } static void ext2_commit_super (struct super_block * sb, _