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Btrfs: Handle write errors on raid1 and raid10

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When duplicate copies exist, writes are allowed to fail to one of those
copies.  This changeset includes a few changes that allow the FS to
continue even when some IOs fail.

It also adds verification of the parent generation number for btree blocks.
This generation is stored in the pointer to a block, and it ensures
that missed writes to are detected.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-05-12 13:39:03 -04:00
parent ca7a79ad8d
commit 1259ab75c6
9 changed files with 155 additions and 49 deletions
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49
fs/btrfs/extent_io.c
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@@ -1366,7 +1366,7 @@ static int end_bio_extent_writepage(struct bio *bio,
unsigned int bytes_done, int err)
#endif
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
int uptodate = err == 0;
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct extent_state *state = bio->bi_private;
struct extent_io_tree *tree = state->tree;
@@ -1375,6 +1375,7 @@ static int end_bio_extent_writepage(struct bio *bio,
u64 end;
u64 cur;
int whole_page;
int ret;
unsigned long flags;
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
@@ -1395,17 +1396,30 @@ static int end_bio_extent_writepage(struct bio *bio,
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
if (tree->ops && tree->ops->writepage_end_io_hook) {
ret = tree->ops->writepage_end_io_hook(page, start,
end, state);
if (ret)
uptodate = 0;
}
if (!uptodate && tree->ops &&
tree->ops->writepage_io_failed_hook) {
ret = tree->ops->writepage_io_failed_hook(bio, page,
start, end, state);
if (ret == 0) {
state = NULL;
uptodate = (err == 0);
continue;
}
}
if (!uptodate) {
clear_extent_uptodate(tree, start, end, GFP_ATOMIC);
ClearPageUptodate(page);
SetPageError(page);
}
if (tree->ops && tree->ops->writepage_end_io_hook) {
tree->ops->writepage_end_io_hook(page, start, end,
state);
}
/*
* bios can get merged in funny ways, and so we need to
* be careful with the state variable. We know the
@@ -2073,9 +2087,9 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
} else {
ret = 0;
}
if (ret)
if (ret) {
SetPageError(page);
else {
} else {
unsigned long max_nr = end_index + 1;
set_range_writeback(tree, cur, cur + iosize - 1);
if (!PageWriteback(page)) {
@@ -2948,6 +2962,25 @@ int set_extent_buffer_dirty(struct extent_io_tree *tree,
}
EXPORT_SYMBOL(set_extent_buffer_dirty);
int clear_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb)
{
unsigned long i;
struct page *page;
unsigned long num_pages;
num_pages = num_extent_pages(eb->start, eb->len);
eb->flags &= ~EXTENT_UPTODATE;
clear_extent_uptodate(tree, eb->start, eb->start + eb->len - 1,
GFP_NOFS);
for (i = 0; i < num_pages; i++) {
page = extent_buffer_page(eb, i);
ClearPageUptodate(page);
}
return 0;
}
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb)
{