Commit cdbf6dba authored Oct 18, 2008 by Eric Sandeen Committed by Linus Torvalds Oct 20, 2008

ext3: avoid printk floods in the face of directory corruption



A very large directory with many read failures (either due to storage
problems, or due to invalid size & blocks from corruption) will generate a
printk storm as the filesystem continues to try to read all the blocks.
This flood of messages can tie up the box until it is complete - which may
be a very long time, especially for very large corrupted values.

This is fixed by only reporting the corruption once each time we try to
read the directory.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Cc: Eugene Teo <eugeneteo@kernel.sg>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 5ec8b75e

fs/ext3/dir.c

+7 −3

Original line number	Diff line number	Diff line
		@@ -102,6 +102,7 @@ static int ext3_readdir(struct file * filp,
		int err;
		struct inode *inode = filp->f_path.dentry->d_inode;
		int ret = 0;
		int dir_has_error = 0;

		sb = inode->i_sb;

		@@ -148,9 +149,12 @@ static int ext3_readdir(struct file * filp,
		* of recovering data when there's a bad sector
		*/
		if (!bh) {
		ext3_error (sb, "ext3_readdir",
		"directory #%lu contains a hole at offset %lu",
		inode->i_ino, (unsigned long)filp->f_pos);
		if (!dir_has_error) {
		ext3_error(sb, __func__, "directory #%lu "
		"contains a hole at offset %lld",
		inode->i_ino, filp->f_pos);
		dir_has_error = 1;
		}
		/* corrupt size? Maybe no more blocks to read */
		if (filp->f_pos > inode->i_blocks << 9)
		break;