Commit bbdc322f authored Jun 08, 2015 by Lukas Czerner Committed by Theodore Ts'o Jun 08, 2015

ext4: try to initialize all groups we can in case of failure on ppc64



Currently on the machines with page size > block size when initializing
block group buddy cache we initialize it for all the block group bitmaps
in the page. However in the case of read error, checksum error, or if
a single bitmap is in any way corrupted we would fail to initialize all
of the bitmaps. This is problematic because we will not have access to
the other allocation groups even though those might be perfectly fine
and usable.

Fix this by reading all the bitmaps instead of error out on the first
problem and simply skip the bitmaps which were either not read properly,
or are not valid.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

parent 41e5b7ed

fs/ext4/mballoc.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -882,10 +882,8 @@ static int ext4_mb_init_cache(struct page page, char incore)

		/* wait for I/O completion */
		for (i = 0, group = first_group; i < groups_per_page; i++, group++) {
		if (bh[i] && ext4_wait_block_bitmap(sb, group, bh[i])) {
		if (bh[i] && ext4_wait_block_bitmap(sb, group, bh[i]))
		err = -EIO;
		goto out;
		}
		}

		first_block = page->index * blocks_per_page;
		@@ -898,6 +896,11 @@ static int ext4_mb_init_cache(struct page page, char incore)
		/* skip initialized uptodate buddy */
		continue;

		if (!buffer_verified(bh[group - first_group]))
		/* Skip faulty bitmaps */
		continue;
		err = 0;

		/*
		* data carry information regarding this
		* particular group in the format specified

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