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Btrfs: Add file data csums back in via hooks in the extent map code

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-08-30 08:50:51 -04:00
committed by David Woodhouse
parent 95e0528919
commit 07157aacb1
3 changed files with 193 additions and 14 deletions
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94
fs/btrfs/extent_map.c
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@@ -57,7 +57,7 @@ void extent_map_tree_init(struct extent_map_tree *tree,
{
tree->map.rb_node = NULL;
tree->state.rb_node = NULL;
tree->fill_delalloc = NULL;
tree->ops = NULL;
rwlock_init(&tree->lock);
tree->mapping = mapping;
}
@@ -93,6 +93,7 @@ struct extent_state *alloc_extent_state(gfp_t mask)
return state;
state->state = 0;
state->in_tree = 0;
state->private = 0;
atomic_set(&state->refs, 1);
init_waitqueue_head(&state->wq);
return state;
@@ -1034,6 +1035,61 @@ int unlock_range(struct extent_map_tree *tree, u64 start, u64 end)
}
EXPORT_SYMBOL(unlock_range);
int set_state_private(struct extent_map_tree *tree, u64 start, u64 private)
{
struct rb_node *node;
struct extent_state *state;
int ret = 0;
write_lock_irq(&tree->lock);
/*
* this search will find all the extents that end after
* our range starts.
*/
node = tree_search(&tree->state, start);
if (!node || IS_ERR(node)) {
ret = -ENOENT;
goto out;
}
state = rb_entry(node, struct extent_state, rb_node);
if (state->start != start) {
ret = -ENOENT;
goto out;
}
state->private = private;
out:
write_unlock_irq(&tree->lock);
return ret;
}
int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private)
{
struct rb_node *node;
struct extent_state *state;
int ret = 0;
read_lock_irq(&tree->lock);
/*
* this search will find all the extents that end after
* our range starts.
*/
node = tree_search(&tree->state, start);
if (!node || IS_ERR(node)) {
ret = -ENOENT;
goto out;
}
state = rb_entry(node, struct extent_state, rb_node);
if (state->start != start) {
ret = -ENOENT;
goto out;
}
*private = state->private;
out:
read_unlock_irq(&tree->lock);
return ret;
}
/*
* searches a range in the state tree for a given mask.
* If 'filled' == 1, this returns 1 only if ever extent in the tree
@@ -1185,12 +1241,13 @@ static int end_bio_extent_writepage(struct bio *bio,
static int end_bio_extent_readpage(struct bio *bio,
unsigned int bytes_done, int err)
{
const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
struct extent_map_tree *tree = bio->bi_private;
u64 start;
u64 end;
int whole_page;
int ret;
if (bio->bi_size)
return 1;
@@ -1208,6 +1265,11 @@ static int end_bio_extent_readpage(struct bio *bio,
if (--bvec >= bio->bi_io_vec)
prefetchw(&bvec->bv_page->flags);
if (uptodate && tree->ops && tree->ops->readpage_end_io_hook) {
ret = tree->ops->readpage_end_io_hook(page, start, end);
if (ret)
uptodate = 0;
}
if (uptodate) {
set_extent_uptodate(tree, start, end, GFP_ATOMIC);
if (whole_page)
@@ -1388,9 +1450,16 @@ int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
continue;
}
ret = submit_extent_page(READ, tree, page,
sector, iosize, page_offset, bdev,
end_bio_extent_readpage);
ret = 0;
if (tree->ops && tree->ops->readpage_io_hook) {
ret = tree->ops->readpage_io_hook(page, cur,
cur + iosize - 1);
}
if (!ret) {
ret = submit_extent_page(READ, tree, page,
sector, iosize, page_offset,
bdev, end_bio_extent_readpage);
}
if (ret)
SetPageError(page);
cur = cur + iosize;
@@ -1462,7 +1531,7 @@ int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
&delalloc_end,
128 * 1024 * 1024);
if (nr_delalloc) {
tree->fill_delalloc(inode, start, delalloc_end);
tree->ops->fill_delalloc(inode, start, delalloc_end);
if (delalloc_end >= page_end + 1) {
clear_extent_bit(tree, page_end + 1, delalloc_end,
EXTENT_LOCKED | EXTENT_DELALLOC,
@@ -1528,12 +1597,17 @@ int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
continue;
}
clear_extent_dirty(tree, cur, cur + iosize - 1, GFP_NOFS);
set_range_writeback(tree, cur, cur + iosize - 1);
ret = submit_extent_page(WRITE, tree, page,
sector, iosize, page_offset, bdev,
end_bio_extent_writepage);
ret = tree->ops->writepage_io_hook(page, cur, cur + iosize - 1);
if (ret)
SetPageError(page);
else {
set_range_writeback(tree, cur, cur + iosize - 1);
ret = submit_extent_page(WRITE, tree, page, sector,
iosize, page_offset, bdev,
end_bio_extent_writepage);
if (ret)
SetPageError(page);
}
cur = cur + iosize;
page_offset += iosize;
nr++;