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Btrfs: Retry metadata reads in the face of checksum failures

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-09 16:28:12 -04:00
parent 22c599485b
commit f188591e98
7 changed files with 138 additions and 52 deletions
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72
fs/btrfs/disk-io.c
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@@ -156,7 +156,6 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
memcpy(&found, result, BTRFS_CRC32_SIZE);
read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
WARN_ON(1);
printk("btrfs: %s checksum verify failed on %llu "
"wanted %X found %X from_this_trans %d "
"level %d\n",
@@ -171,6 +170,40 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
return 0;
}
static int btree_read_extent_buffer_pages(struct btrfs_root *root,
struct extent_buffer *eb,
u64 start)
{
struct extent_io_tree *io_tree;
int ret;
int num_copies = 0;
int mirror_num = 0;
io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
while (1) {
ret = read_extent_buffer_pages(io_tree, eb, start, 1,
btree_get_extent, mirror_num);
if (!ret) {
if (mirror_num)
printk("good read %Lu mirror %d total %d\n", eb->start, mirror_num, num_copies);
return ret;
}
num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
eb->start, eb->len);
printk("failed to read %Lu mirror %d total %d\n", eb->start, mirror_num, num_copies);
if (num_copies == 1) {
printk("reading %Lu failed only one copy\n", eb->start);
return ret;
}
mirror_num++;
if (mirror_num > num_copies) {
printk("bailing at mirror %d of %d\n", mirror_num, num_copies);
return ret;
}
}
printk("read extent buffer page last\n");
return -EIO;
}
int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
{
@@ -180,6 +213,8 @@ int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
int found_level;
unsigned long len;
struct extent_buffer *eb;
int ret;
tree = &BTRFS_I(page->mapping->host)->io_tree;
if (page->private == EXTENT_PAGE_PRIVATE)
@@ -191,8 +226,8 @@ int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
WARN_ON(1);
}
eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1,
btree_get_extent);
ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE);
BUG_ON(ret);
btrfs_clear_buffer_defrag(eb);
found_start = btrfs_header_bytenr(eb);
if (found_start != start) {
@@ -240,7 +275,7 @@ int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
unsigned long len;
struct extent_buffer *eb;
struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
int ret;
int ret = 0;
tree = &BTRFS_I(page->mapping->host)->io_tree;
if (page->private == EXTENT_PAGE_PRIVATE)
@@ -252,25 +287,26 @@ int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
WARN_ON(1);
}
eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1,
btree_get_extent);
btrfs_clear_buffer_defrag(eb);
found_start = btrfs_header_bytenr(eb);
if (found_start != start) {
printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
start, found_start, len);
WARN_ON(1);
printk("bad start on %Lu found %Lu\n", eb->start, found_start);
ret = -EIO;
goto err;
}
if (eb->first_page != page) {
printk("bad first page %lu %lu\n", eb->first_page->index,
page->index);
WARN_ON(1);
ret = -EIO;
goto err;
}
found_level = btrfs_header_level(eb);
ret = csum_tree_block(root, eb, 1);
if (ret)
ret = -EIO;
end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
end = eb->start + end - 1;
@@ -278,7 +314,7 @@ int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
err:
free_extent_buffer(eb);
out:
return 0;
return ret;
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
@@ -329,7 +365,8 @@ int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
return 0;
}
static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
int mirror_num)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 offset;
@@ -338,7 +375,7 @@ static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
offset = bio->bi_sector << 9;
if (rw & (1 << BIO_RW)) {
return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio);
return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
}
ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
@@ -349,7 +386,7 @@ static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio)
submit_bio(rw, bio);
return 0;
}
return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio);
return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
}
static int btree_writepage(struct page *page, struct writeback_control *wbc)
@@ -459,7 +496,7 @@ int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
if (!buf)
return 0;
read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
buf, 0, 0, btree_get_extent);
buf, 0, 0, btree_get_extent, 0);
free_extent_buffer(buf);
return ret;
}
@@ -522,8 +559,7 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
if (!buf)
return NULL;
ret = read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, buf, 0,
1, btree_get_extent);
ret = btree_read_extent_buffer_pages(root, buf, 0);
if (ret == 0) {
buf->flags |= EXTENT_UPTODATE;
@@ -1366,10 +1402,8 @@ int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
int btrfs_read_buffer(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
int ret;
ret = read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
buf, 0, 1, btree_get_extent);
ret = btree_read_extent_buffer_pages(root, buf, 0);
if (ret == 0) {
buf->flags |= EXTENT_UPTODATE;
}