iget: stop EXT4 from using iget() and read_inode()
Stop the EXT4 filesystem from using iget() and read_inode(). Replace ext4_read_inode() with ext4_iget(), and call that instead of iget(). ext4_iget() then uses iget_locked() directly and returns a proper error code instead of an inode in the event of an error. ext4_fill_super() returns any error incurred when getting the root inode instead of EINVAL. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Jan Kara <jack@suse.cz> Cc: <linux-ext4@vger.kernel.org> 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>
This commit is contained in:
David Howells
Linus Torvalds
parent
473043dcee
commit
1d1fe1ee02
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@ -782,14 +782,15 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
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unsigned long max_ino = le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count);
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ext4_group_t block_group;
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int bit;
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struct buffer_head *bitmap_bh = NULL;
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struct buffer_head *bitmap_bh;
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struct inode *inode = NULL;
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long err = -EIO;
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/* Error cases - e2fsck has already cleaned up for us */
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if (ino > max_ino) {
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ext4_warning(sb, __FUNCTION__,
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"bad orphan ino %lu! e2fsck was run?", ino);
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goto out;
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goto error;
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}
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block_group = (ino - 1) / EXT4_INODES_PER_GROUP(sb);
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@ -798,38 +799,49 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
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if (!bitmap_bh) {
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ext4_warning(sb, __FUNCTION__,
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"inode bitmap error for orphan %lu", ino);
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goto out;
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goto error;
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}
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/* Having the inode bit set should be a 100% indicator that this
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* is a valid orphan (no e2fsck run on fs). Orphans also include
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* inodes that were being truncated, so we can't check i_nlink==0.
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*/
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if (!ext4_test_bit(bit, bitmap_bh->b_data) ||
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!(inode = iget(sb, ino)) || is_bad_inode(inode) ||
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NEXT_ORPHAN(inode) > max_ino) {
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ext4_warning(sb, __FUNCTION__,
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"bad orphan inode %lu! e2fsck was run?", ino);
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printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
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bit, (unsigned long long)bitmap_bh->b_blocknr,
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ext4_test_bit(bit, bitmap_bh->b_data));
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printk(KERN_NOTICE "inode=%p\n", inode);
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if (inode) {
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printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
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is_bad_inode(inode));
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printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
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NEXT_ORPHAN(inode));
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printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
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}
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/* Avoid freeing blocks if we got a bad deleted inode */
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if (inode && inode->i_nlink == 0)
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inode->i_blocks = 0;
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iput(inode);
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inode = NULL;
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}
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out:
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if (!ext4_test_bit(bit, bitmap_bh->b_data))
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goto bad_orphan;
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inode = ext4_iget(sb, ino);
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if (IS_ERR(inode))
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goto iget_failed;
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if (NEXT_ORPHAN(inode) > max_ino)
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goto bad_orphan;
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brelse(bitmap_bh);
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return inode;
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iget_failed:
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err = PTR_ERR(inode);
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inode = NULL;
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bad_orphan:
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ext4_warning(sb, __FUNCTION__,
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"bad orphan inode %lu! e2fsck was run?", ino);
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printk(KERN_NOTICE "ext4_test_bit(bit=%d, block=%llu) = %d\n",
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bit, (unsigned long long)bitmap_bh->b_blocknr,
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ext4_test_bit(bit, bitmap_bh->b_data));
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printk(KERN_NOTICE "inode=%p\n", inode);
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if (inode) {
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printk(KERN_NOTICE "is_bad_inode(inode)=%d\n",
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is_bad_inode(inode));
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printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
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NEXT_ORPHAN(inode));
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printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
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/* Avoid freeing blocks if we got a bad deleted inode */
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if (inode->i_nlink == 0)
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inode->i_blocks = 0;
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iput(inode);
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}
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brelse(bitmap_bh);
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error:
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return ERR_PTR(err);
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}
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unsigned long ext4_count_free_inodes (struct super_block * sb)
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@ -2680,21 +2680,31 @@ static blkcnt_t ext4_inode_blocks(struct ext4_inode *raw_inode,
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}
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}
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void ext4_read_inode(struct inode * inode)
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struct inode *ext4_iget(struct super_block *sb, unsigned long ino)
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{
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struct ext4_iloc iloc;
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struct ext4_inode *raw_inode;
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struct ext4_inode_info *ei = EXT4_I(inode);
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struct ext4_inode_info *ei;
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struct buffer_head *bh;
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struct inode *inode;
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long ret;
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int block;
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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ei = EXT4_I(inode);
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#ifdef CONFIG_EXT4DEV_FS_POSIX_ACL
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ei->i_acl = EXT4_ACL_NOT_CACHED;
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ei->i_default_acl = EXT4_ACL_NOT_CACHED;
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#endif
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ei->i_block_alloc_info = NULL;
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if (__ext4_get_inode_loc(inode, &iloc, 0))
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ret = __ext4_get_inode_loc(inode, &iloc, 0);
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if (ret < 0)
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goto bad_inode;
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bh = iloc.bh;
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raw_inode = ext4_raw_inode(&iloc);
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@ -2720,6 +2730,7 @@ void ext4_read_inode(struct inode * inode)
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!(EXT4_SB(inode->i_sb)->s_mount_state & EXT4_ORPHAN_FS)) {
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/* this inode is deleted */
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brelse (bh);
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ret = -ESTALE;
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goto bad_inode;
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}
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/* The only unlinked inodes we let through here have
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@ -2758,6 +2769,7 @@ void ext4_read_inode(struct inode * inode)
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if (EXT4_GOOD_OLD_INODE_SIZE + ei->i_extra_isize >
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EXT4_INODE_SIZE(inode->i_sb)) {
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brelse (bh);
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ret = -EIO;
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goto bad_inode;
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}
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if (ei->i_extra_isize == 0) {
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@ -2811,11 +2823,12 @@ void ext4_read_inode(struct inode * inode)
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}
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brelse (iloc.bh);
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ext4_set_inode_flags(inode);
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return;
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unlock_new_inode(inode);
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return inode;
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bad_inode:
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make_bad_inode(inode);
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return;
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iget_failed(inode);
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return ERR_PTR(ret);
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}
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static int ext4_inode_blocks_set(handle_t *handle,
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@ -1039,17 +1039,11 @@ static struct dentry *ext4_lookup(struct inode * dir, struct dentry *dentry, str
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if (!ext4_valid_inum(dir->i_sb, ino)) {
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ext4_error(dir->i_sb, "ext4_lookup",
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"bad inode number: %lu", ino);
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inode = NULL;
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} else
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inode = iget(dir->i_sb, ino);
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if (!inode)
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return ERR_PTR(-EACCES);
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if (is_bad_inode(inode)) {
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iput(inode);
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return ERR_PTR(-ENOENT);
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return ERR_PTR(-EIO);
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}
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inode = ext4_iget(dir->i_sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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}
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return d_splice_alias(inode, dentry);
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}
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@ -1078,18 +1072,13 @@ struct dentry *ext4_get_parent(struct dentry *child)
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if (!ext4_valid_inum(child->d_inode->i_sb, ino)) {
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ext4_error(child->d_inode->i_sb, "ext4_get_parent",
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"bad inode number: %lu", ino);
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inode = NULL;
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} else
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inode = iget(child->d_inode->i_sb, ino);
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if (!inode)
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return ERR_PTR(-EACCES);
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if (is_bad_inode(inode)) {
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iput(inode);
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return ERR_PTR(-ENOENT);
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return ERR_PTR(-EIO);
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}
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inode = ext4_iget(child->d_inode->i_sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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parent = d_alloc_anon(inode);
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if (!parent) {
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iput(inode);
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@ -779,12 +779,11 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
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"No reserved GDT blocks, can't resize");
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return -EPERM;
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}
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inode = iget(sb, EXT4_RESIZE_INO);
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if (!inode || is_bad_inode(inode)) {
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inode = ext4_iget(sb, EXT4_RESIZE_INO);
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if (IS_ERR(inode)) {
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ext4_warning(sb, __FUNCTION__,
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"Error opening resize inode");
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iput(inode);
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return -ENOENT;
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return PTR_ERR(inode);
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}
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}
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@ -777,11 +777,10 @@ static struct inode *ext4_nfs_get_inode(struct super_block *sb,
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* Currently we don't know the generation for parent directory, so
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* a generation of 0 means "accept any"
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*/
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inode = iget(sb, ino);
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if (inode == NULL)
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return ERR_PTR(-ENOMEM);
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if (is_bad_inode(inode) ||
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(generation && inode->i_generation != generation)) {
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inode = ext4_iget(sb, ino);
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if (IS_ERR(inode))
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return ERR_CAST(inode);
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if (generation && inode->i_generation != generation) {
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iput(inode);
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return ERR_PTR(-ESTALE);
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}
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@ -850,7 +849,6 @@ static struct quotactl_ops ext4_qctl_operations = {
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static const struct super_operations ext4_sops = {
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.alloc_inode = ext4_alloc_inode,
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.destroy_inode = ext4_destroy_inode,
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.read_inode = ext4_read_inode,
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.write_inode = ext4_write_inode,
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.dirty_inode = ext4_dirty_inode,
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.delete_inode = ext4_delete_inode,
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@ -1805,6 +1803,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
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unsigned long journal_devnum = 0;
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unsigned long def_mount_opts;
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struct inode *root;
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int ret = -EINVAL;
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int blocksize;
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int db_count;
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int i;
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@ -2237,19 +2236,24 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
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* so we can safely mount the rest of the filesystem now.
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*/
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root = iget(sb, EXT4_ROOT_INO);
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sb->s_root = d_alloc_root(root);
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if (!sb->s_root) {
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root = ext4_iget(sb, EXT4_ROOT_INO);
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if (IS_ERR(root)) {
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printk(KERN_ERR "EXT4-fs: get root inode failed\n");
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iput(root);
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ret = PTR_ERR(root);
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goto failed_mount4;
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}
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if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
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dput(sb->s_root);
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sb->s_root = NULL;
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iput(root);
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printk(KERN_ERR "EXT4-fs: corrupt root inode, run e2fsck\n");
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goto failed_mount4;
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}
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sb->s_root = d_alloc_root(root);
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if (!sb->s_root) {
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printk(KERN_ERR "EXT4-fs: get root dentry failed\n");
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iput(root);
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ret = -ENOMEM;
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goto failed_mount4;
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}
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ext4_setup_super (sb, es, sb->s_flags & MS_RDONLY);
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@ -2330,7 +2334,7 @@ out_fail:
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sb->s_fs_info = NULL;
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kfree(sbi);
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lock_kernel();
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return -EINVAL;
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return ret;
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}
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/*
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@ -2366,8 +2370,8 @@ static journal_t *ext4_get_journal(struct super_block *sb,
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* things happen if we iget() an unused inode, as the subsequent
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* iput() will try to delete it. */
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journal_inode = iget(sb, journal_inum);
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if (!journal_inode) {
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journal_inode = ext4_iget(sb, journal_inum);
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if (IS_ERR(journal_inode)) {
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printk(KERN_ERR "EXT4-fs: no journal found.\n");
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return NULL;
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}
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@ -2380,7 +2384,7 @@ static journal_t *ext4_get_journal(struct super_block *sb,
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jbd_debug(2, "Journal inode found at %p: %Ld bytes\n",
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journal_inode, journal_inode->i_size);
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if (is_bad_inode(journal_inode) || !S_ISREG(journal_inode->i_mode)) {
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if (!S_ISREG(journal_inode->i_mode)) {
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printk(KERN_ERR "EXT4-fs: invalid journal inode.\n");
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iput(journal_inode);
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return NULL;
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@ -1024,7 +1024,7 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
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struct buffer_head *bh_result,
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int create, int extend_disksize);
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extern void ext4_read_inode (struct inode *);
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extern struct inode *ext4_iget(struct super_block *, unsigned long);
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extern int ext4_write_inode (struct inode *, int);
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extern int ext4_setattr (struct dentry *, struct iattr *);
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extern void ext4_delete_inode (struct inode *);
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