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Btrfs: fix compressed write corruption on enospc 

When failing to allocate space for the whole compressed extent, we'll
fallback to uncompressed IO, but we've forgotten to redirty the pages
which belong to this compressed extent, and these 'clean' pages will
simply skip 'submit' part and go to endio directly, at last we got data
corruption as we write nothing.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Tested-By: Martin Steigerwald <martin@lichtvoll.de>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Liu Bo 2014-07-24 22:48:05 +08:00 committed by Chris Mason
parent f90e579c2b
commit ce62003f69
1 changed files with 12 additions and 0 deletions
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12
fs/btrfs/inode.c
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@ -709,6 +709,18 @@ static noinline int submit_compressed_extents(struct inode *inode,
unlock_extent(io_tree, async_extent->start,
async_extent->start +
async_extent->ram_size - 1);
/*
* we need to redirty the pages if we decide to
* fallback to uncompressed IO, otherwise we
* will not submit these pages down to lower
* layers.
*/
extent_range_redirty_for_io(inode,
async_extent->start,
async_extent->start +
async_extent->ram_size - 1);
goto retry;
}
goto out_free;