Commit a361293f authored by Jan Kara's avatar Jan Kara Committed by Theodore Ts'o
Browse files

jbd2: Fix oops in jbd2_journal_file_inode() 



Commit 0713ed0c added
jbd2_journal_file_inode() call into ext4_block_zero_page_range().
However that function gets called from truncate path and thus inode
needn't have jinode attached - that happens in ext4_file_open() but
the file needn't be ever open since mount. Calling
jbd2_journal_file_inode() without jinode attached results in the oops.

We fix the problem by attaching jinode to inode also in ext4_truncate()
and ext4_punch_hole() when we are going to zero out partial blocks.

Reported-by: default avatarmajianpeng <majianpeng@gmail.com>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 91aa11fa

fs/ext4/ext4.h

+1 −0
Original line number Diff line number Diff line
@@ -2086,6 +2086,7 @@ extern int ext4_sync_inode(handle_t *, struct inode *); 
extern void ext4_dirty_inode(struct inode *, int);

extern int ext4_change_inode_journal_flag(struct inode *, int);

extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);

extern int ext4_inode_attach_jinode(struct inode *inode);

extern int ext4_can_truncate(struct inode *inode);

extern void ext4_truncate(struct inode *);

extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);

fs/ext4/file.c

+4 −17
Original line number Diff line number Diff line
@@ -219,7 +219,6 @@ static int ext4_file_open(struct inode * inode, struct file * filp) 
{

	struct super_block *sb = inode->i_sb;

	struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);

	struct ext4_inode_info *ei = EXT4_I(inode);

	struct vfsmount *mnt = filp->f_path.mnt;

	struct path path;

	char buf[64], *cp;
@@ -259,22 +258,10 @@ static int ext4_file_open(struct inode * inode, struct file * filp) 
	 * Set up the jbd2_inode if we are opening the inode for

	 * writing and the journal is present

	 */

	if (sbi->s_journal && !ei->jinode && (filp->f_mode & FMODE_WRITE)) {

		struct jbd2_inode *jinode = jbd2_alloc_inode(GFP_KERNEL);



		spin_lock(&inode->i_lock);

		if (!ei->jinode) {

			if (!jinode) {

				spin_unlock(&inode->i_lock);

				return -ENOMEM;

			}

			ei->jinode = jinode;

			jbd2_journal_init_jbd_inode(ei->jinode, inode);

			jinode = NULL;

		}

		spin_unlock(&inode->i_lock);

		if (unlikely(jinode != NULL))

			jbd2_free_inode(jinode);

	if (filp->f_mode & FMODE_WRITE) {

		int ret = ext4_inode_attach_jinode(inode);

		if (ret < 0)

			return ret;

	}

	return dquot_file_open(inode, filp);

}

fs/ext4/inode.c

+43 −0
Original line number Diff line number Diff line
@@ -3533,6 +3533,18 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) 
		   offset;

	}



	if (offset & (sb->s_blocksize - 1) ||

	    (offset + length) & (sb->s_blocksize - 1)) {

		/*

		 * Attach jinode to inode for jbd2 if we do any zeroing of

		 * partial block

		 */

		ret = ext4_inode_attach_jinode(inode);

		if (ret < 0)

			goto out_mutex;



	}



	first_block_offset = round_up(offset, sb->s_blocksize);

	last_block_offset = round_down((offset + length), sb->s_blocksize) - 1;
@@ -3601,6 +3613,31 @@ out_mutex: 
	return ret;

}



int ext4_inode_attach_jinode(struct inode *inode)

{

	struct ext4_inode_info *ei = EXT4_I(inode);

	struct jbd2_inode *jinode;



	if (ei->jinode || !EXT4_SB(inode->i_sb)->s_journal)

		return 0;



	jinode = jbd2_alloc_inode(GFP_KERNEL);

	spin_lock(&inode->i_lock);

	if (!ei->jinode) {

		if (!jinode) {

			spin_unlock(&inode->i_lock);

			return -ENOMEM;

		}

		ei->jinode = jinode;

		jbd2_journal_init_jbd_inode(ei->jinode, inode);

		jinode = NULL;

	}

	spin_unlock(&inode->i_lock);

	if (unlikely(jinode != NULL))

		jbd2_free_inode(jinode);

	return 0;

}



/*

 * ext4_truncate()

 *
@@ -3661,6 +3698,12 @@ void ext4_truncate(struct inode *inode) 
			return;

	}



	/* If we zero-out tail of the page, we have to create jinode for jbd2 */

	if (inode->i_size & (inode->i_sb->s_blocksize - 1)) {

		if (ext4_inode_attach_jinode(inode) < 0)

			return;

	}



	if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))

		credits = ext4_writepage_trans_blocks(inode);

	else

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