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authorRik van Riel <riel@redhat.com>2011-01-13 15:46:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:35 -0800
commit212260aa07135b327752dc02625c68cf4ce04caf (patch)
tree7ea25dddf5f69e91ec4b3d22f940e6c9604c7f93 /mm/filemap.c
parentdabb16f639820267b3850d804571c70bd93d4e07 (diff)
downloadop-kernel-dev-212260aa07135b327752dc02625c68cf4ce04caf.zip
op-kernel-dev-212260aa07135b327752dc02625c68cf4ce04caf.tar.gz
mm: clear PageError bit in msync & fsync
Temporary IO failures, eg. due to loss of both multipath paths, can permanently leave the PageError bit set on a page, resulting in msync or fsync returning -EIO over and over again, even if IO is now getting to the disk correctly. We already clear the AS_ENOSPC and AS_IO bits in mapping->flags in the filemap_fdatawait_range function. Also clearing the PageError bit on the page allows subsequent msync or fsync calls on this file to return without an error, if the subsequent IO succeeds. Unfortunately data written out in the msync or fsync call that returned -EIO can still get lost, because the page dirty bit appears to not get restored on IO error. However, the alternative could be potentially all of memory filling up with uncleanable dirty pages, hanging the system, so there is no nice choice here... Signed-off-by: Rik van Riel <riel@redhat.com> Acked-by: Valerie Aurora <vaurora@redhat.com> Acked-by: Jeff Layton <jlayton@redhat.com> Cc: Theodore Ts'o <tytso@mit.edu> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 1a3dd59..b4ad8e3 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -298,7 +298,7 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
continue;
wait_on_page_writeback(page);
- if (PageError(page))
+ if (TestClearPageError(page))
ret = -EIO;
}
pagevec_release(&pvec);
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