Commit ea0174a7 authored Oct 12, 2009 by Eric Sandeen Committed by Jan Kara Nov 11, 2009

ext3: retry failed direct IO allocations



On a 256M 4k block filesystem, doing this in a loop:

    dd if=/dev/zero of=test oflag=direct bs=1M count=64
    rm -f test

eventually leads to spurious ENOSPC:

    dd: writing `test': No space left on device

As with other block allocation callers, it looks like we need to
potentially retry the allocations on the initial ENOSPC.

A similar patch went into ext4 (commit
fbbf6945)

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>

parent 799dd75b

fs/ext3/inode.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -1735,6 +1735,7 @@ static ssize_t ext3_direct_IO(int rw, struct kiocb *iocb,
		ssize_t ret;
		int orphan = 0;
		size_t count = iov_length(iov, nr_segs);
		int retries = 0;

		if (rw == WRITE) {
		loff_t final_size = offset + count;
		@@ -1757,9 +1758,12 @@ static ssize_t ext3_direct_IO(int rw, struct kiocb *iocb,
		}
		}

		retry:
		ret = blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov,
		offset, nr_segs,
		ext3_get_block, NULL);
		if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries))
		goto retry;

		if (orphan) {
		int err;