* Boston, MA 021110-1307, USA.
*/
-#include <linux/module.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
-#include <linux/crc32c.h>
#include <linux/scatterlist.h>
#include <linux/swap.h>
#include <linux/radix-tree.h>
#include <linux/writeback.h>
+#include <linux/buffer_head.h> // for block_sync_page
+#include <linux/workqueue.h>
+#include "crc32c.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
+#include "volumes.h"
+#include "print-tree.h"
-u64 bh_blocknr(struct buffer_head *bh)
+#if 0
+static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
{
- return bh->b_blocknr;
-}
-
-static int check_tree_block(struct btrfs_root *root, struct buffer_head *buf)
-{
- struct btrfs_node *node = btrfs_buffer_node(buf);
- if (bh_blocknr(buf) != btrfs_header_blocknr(&node->header)) {
- printk(KERN_CRIT "bh_blocknr(buf) is %llu, header is %llu\n",
- (unsigned long long)bh_blocknr(buf),
- (unsigned long long)btrfs_header_blocknr(&node->header));
+ if (extent_buffer_blocknr(buf) != btrfs_header_blocknr(buf)) {
+ printk(KERN_CRIT "buf blocknr(buf) is %llu, header is %llu\n",
+ (unsigned long long)extent_buffer_blocknr(buf),
+ (unsigned long long)btrfs_header_blocknr(buf));
return 1;
}
return 0;
}
+#endif
+
+static struct extent_io_ops btree_extent_io_ops;
+static struct workqueue_struct *end_io_workqueue;
+static struct workqueue_struct *async_submit_workqueue;
+
+struct end_io_wq {
+ struct bio *bio;
+ bio_end_io_t *end_io;
+ void *private;
+ struct btrfs_fs_info *info;
+ int error;
+ int metadata;
+ struct list_head list;
+};
+
+struct async_submit_bio {
+ struct inode *inode;
+ struct bio *bio;
+ struct list_head list;
+ extent_submit_bio_hook_t *submit_bio_hook;
+ int rw;
+ int mirror_num;
+};
-struct buffer_head *btrfs_find_tree_block(struct btrfs_root *root, u64 blocknr)
+struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
+ size_t page_offset, u64 start, u64 len,
+ int create)
{
- struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
- int blockbits = root->fs_info->sb->s_blocksize_bits;
- unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits);
- struct page *page;
- struct buffer_head *bh;
- struct buffer_head *head;
- struct buffer_head *ret = NULL;
+ struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
+ struct extent_map *em;
+ int ret;
+again:
+ spin_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, start, len);
+ spin_unlock(&em_tree->lock);
+ if (em) {
+ goto out;
+ }
+ em = alloc_extent_map(GFP_NOFS);
+ if (!em) {
+ em = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+ em->start = 0;
+ em->len = i_size_read(inode);
+ em->block_start = 0;
+ em->bdev = inode->i_sb->s_bdev;
- page = find_lock_page(mapping, index);
- if (!page)
- return NULL;
+ spin_lock(&em_tree->lock);
+ ret = add_extent_mapping(em_tree, em);
+ spin_unlock(&em_tree->lock);
- if (!page_has_buffers(page))
- goto out_unlock;
+ if (ret == -EEXIST) {
+ free_extent_map(em);
+ em = NULL;
+ goto again;
+ } else if (ret) {
+ em = ERR_PTR(ret);
+ }
+out:
+ return em;
+}
- head = page_buffers(page);
- bh = head;
- do {
- if (buffer_mapped(bh) && bh_blocknr(bh) == blocknr) {
- ret = bh;
- get_bh(bh);
- goto out_unlock;
- }
- bh = bh->b_this_page;
- } while (bh != head);
-out_unlock:
- unlock_page(page);
- page_cache_release(page);
- return ret;
+u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
+{
+ return btrfs_crc32c(seed, data, len);
}
-int btrfs_map_bh_to_logical(struct btrfs_root *root, struct buffer_head *bh,
- u64 logical)
+void btrfs_csum_final(u32 crc, char *result)
{
- if (logical == 0) {
- bh->b_bdev = NULL;
- bh->b_blocknr = 0;
- set_buffer_mapped(bh);
+ *(__le32 *)result = ~cpu_to_le32(crc);
+}
+
+static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
+ int verify)
+{
+ char result[BTRFS_CRC32_SIZE];
+ unsigned long len;
+ unsigned long cur_len;
+ unsigned long offset = BTRFS_CSUM_SIZE;
+ char *map_token = NULL;
+ char *kaddr;
+ unsigned long map_start;
+ unsigned long map_len;
+ int err;
+ u32 crc = ~(u32)0;
+
+ len = buf->len - offset;
+ while(len > 0) {
+ err = map_private_extent_buffer(buf, offset, 32,
+ &map_token, &kaddr,
+ &map_start, &map_len, KM_USER0);
+ if (err) {
+ printk("failed to map extent buffer! %lu\n",
+ offset);
+ return 1;
+ }
+ cur_len = min(len, map_len - (offset - map_start));
+ crc = btrfs_csum_data(root, kaddr + offset - map_start,
+ crc, cur_len);
+ len -= cur_len;
+ offset += cur_len;
+ unmap_extent_buffer(buf, map_token, KM_USER0);
+ }
+ btrfs_csum_final(crc, result);
+
+ if (verify) {
+ int from_this_trans = 0;
+
+ if (root->fs_info->running_transaction &&
+ btrfs_header_generation(buf) ==
+ root->fs_info->running_transaction->transid)
+ from_this_trans = 1;
+
+ /* FIXME, this is not good */
+ if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
+ u32 val;
+ u32 found = 0;
+ memcpy(&found, result, BTRFS_CRC32_SIZE);
+
+ read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
+ printk("btrfs: %s checksum verify failed on %llu "
+ "wanted %X found %X from_this_trans %d "
+ "level %d\n",
+ root->fs_info->sb->s_id,
+ buf->start, val, found, from_this_trans,
+ btrfs_header_level(buf));
+ return 1;
+ }
} else {
- map_bh(bh, root->fs_info->sb, logical);
+ write_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE);
}
return 0;
}
-struct buffer_head *btrfs_find_create_tree_block(struct btrfs_root *root,
- u64 blocknr)
+static int btree_read_extent_buffer_pages(struct btrfs_root *root,
+ struct extent_buffer *eb,
+ u64 start)
{
- struct address_space *mapping = root->fs_info->btree_inode->i_mapping;
- int blockbits = root->fs_info->sb->s_blocksize_bits;
- unsigned long index = blocknr >> (PAGE_CACHE_SHIFT - blockbits);
- struct page *page;
- struct buffer_head *bh;
- struct buffer_head *head;
- struct buffer_head *ret = NULL;
- int err;
- u64 first_block = index << (PAGE_CACHE_SHIFT - blockbits);
-
- page = find_or_create_page(mapping, index, GFP_NOFS);
- if (!page)
- return NULL;
+ struct extent_io_tree *io_tree;
+ int ret;
+ int num_copies = 0;
+ int mirror_num = 0;
- if (!page_has_buffers(page))
- create_empty_buffers(page, root->fs_info->sb->s_blocksize, 0);
- head = page_buffers(page);
- bh = head;
- do {
- if (!buffer_mapped(bh)) {
- err = btrfs_map_bh_to_logical(root, bh, first_block);
- BUG_ON(err);
+ 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;
}
- if (bh_blocknr(bh) == blocknr) {
- ret = bh;
- get_bh(bh);
- goto out_unlock;
+ 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;
}
- bh = bh->b_this_page;
- first_block++;
- } while (bh != head);
-out_unlock:
- unlock_page(page);
+ 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)
+{
+ struct extent_io_tree *tree;
+ u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
+ u64 found_start;
+ 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)
+ goto out;
+ if (!page->private)
+ goto out;
+ len = page->private >> 2;
+ if (len == 0) {
+ WARN_ON(1);
+ }
+ eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
+ 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) {
+ printk("warning: eb start incorrect %Lu buffer %Lu len %lu\n",
+ start, found_start, len);
+ WARN_ON(1);
+ goto err;
+ }
+ if (eb->first_page != page) {
+ printk("bad first page %lu %lu\n", eb->first_page->index,
+ page->index);
+ WARN_ON(1);
+ goto err;
+ }
+ if (!PageUptodate(page)) {
+ printk("csum not up to date page %lu\n", page->index);
+ WARN_ON(1);
+ goto err;
+ }
+ found_level = btrfs_header_level(eb);
+ spin_lock(&root->fs_info->hash_lock);
+ btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
+ spin_unlock(&root->fs_info->hash_lock);
+ csum_tree_block(root, eb, 0);
+err:
+ free_extent_buffer(eb);
+out:
+ return 0;
+}
+
+static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
+{
+ struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
+
+ csum_dirty_buffer(root, page);
+ return 0;
+}
+
+int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end,
+ struct extent_state *state)
+{
+ struct extent_io_tree *tree;
+ u64 found_start;
+ int found_level;
+ unsigned long len;
+ struct extent_buffer *eb;
+ struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
+ int ret = 0;
+
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
+ if (page->private == EXTENT_PAGE_PRIVATE)
+ goto out;
+ if (!page->private)
+ goto out;
+ len = page->private >> 2;
+ if (len == 0) {
+ WARN_ON(1);
+ }
+ eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
+
+ btrfs_clear_buffer_defrag(eb);
+ found_start = btrfs_header_bytenr(eb);
+ if (found_start != start) {
+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)
- touch_buffer(ret);
- page_cache_release(page);
+ ret = -EIO;
+
+ end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
+ end = eb->start + end - 1;
+ release_extent_buffer_tail_pages(eb);
+err:
+ free_extent_buffer(eb);
+out:
return ret;
}
-static int btree_get_block(struct inode *inode, sector_t iblock,
- struct buffer_head *bh, int create)
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
+static void end_workqueue_bio(struct bio *bio, int err)
+#else
+static int end_workqueue_bio(struct bio *bio,
+ unsigned int bytes_done, int err)
+#endif
{
- int err;
- struct btrfs_root *root = BTRFS_I(bh->b_page->mapping->host)->root;
- err = btrfs_map_bh_to_logical(root, bh, iblock);
- return err;
+ struct end_io_wq *end_io_wq = bio->bi_private;
+ struct btrfs_fs_info *fs_info;
+ unsigned long flags;
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ if (bio->bi_size)
+ return 1;
+#endif
+
+ fs_info = end_io_wq->info;
+ spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
+ end_io_wq->error = err;
+ list_add_tail(&end_io_wq->list, &fs_info->end_io_work_list);
+ spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
+ queue_work(end_io_workqueue, &fs_info->end_io_work);
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ return 0;
+#endif
}
-int btrfs_csum_data(struct btrfs_root * root, char *data, size_t len,
- char *result)
+int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
+ int metadata)
{
- u32 crc;
- crc = crc32c(0, data, len);
- memcpy(result, &crc, BTRFS_CRC32_SIZE);
+ struct end_io_wq *end_io_wq;
+ end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS);
+ if (!end_io_wq)
+ return -ENOMEM;
+
+ end_io_wq->private = bio->bi_private;
+ end_io_wq->end_io = bio->bi_end_io;
+ end_io_wq->info = info;
+ end_io_wq->error = 0;
+ end_io_wq->bio = bio;
+ end_io_wq->metadata = metadata;
+
+ bio->bi_private = end_io_wq;
+ bio->bi_end_io = end_workqueue_bio;
return 0;
}
-static int csum_tree_block(struct btrfs_root *root, struct buffer_head *bh,
- int verify)
+int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode,
+ int rw, struct bio *bio, int mirror_num,
+ extent_submit_bio_hook_t *submit_bio_hook)
{
- char result[BTRFS_CRC32_SIZE];
+ struct async_submit_bio *async;
+
+ async = kmalloc(sizeof(*async), GFP_NOFS);
+ if (!async)
+ return -ENOMEM;
+
+ async->inode = inode;
+ async->rw = rw;
+ async->bio = bio;
+ async->mirror_num = mirror_num;
+ async->submit_bio_hook = submit_bio_hook;
+
+ spin_lock(&fs_info->async_submit_work_lock);
+ list_add_tail(&async->list, &fs_info->async_submit_work_list);
+ spin_unlock(&fs_info->async_submit_work_lock);
+
+ queue_work(async_submit_workqueue, &fs_info->async_submit_work);
+ return 0;
+}
+
+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;
int ret;
- struct btrfs_node *node;
- ret = btrfs_csum_data(root, bh->b_data + BTRFS_CSUM_SIZE,
- bh->b_size - BTRFS_CSUM_SIZE, result);
- if (ret)
- return ret;
- if (verify) {
- if (memcmp(bh->b_data, result, BTRFS_CRC32_SIZE)) {
- printk("btrfs: %s checksum verify failed on %llu\n",
- root->fs_info->sb->s_id,
- (unsigned long long)bh_blocknr(bh));
- return 1;
+ offset = bio->bi_sector << 9;
+
+ if (rw & (1 << BIO_RW)) {
+ return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
+ }
+
+ ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
+ BUG_ON(ret);
+
+ if (offset == BTRFS_SUPER_INFO_OFFSET) {
+ bio->bi_bdev = root->fs_info->fs_devices->latest_bdev;
+ submit_bio(rw, bio);
+ return 0;
+ }
+ return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
+}
+
+static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
+ int mirror_num)
+{
+ if (!(rw & (1 << BIO_RW))) {
+ return __btree_submit_bio_hook(inode, rw, bio, mirror_num);
+ }
+ return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
+ inode, rw, bio, mirror_num,
+ __btree_submit_bio_hook);
+}
+
+static int btree_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
+ return extent_write_full_page(tree, page, btree_get_extent, wbc);
+}
+
+static int btree_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(mapping->host)->io_tree;
+ if (wbc->sync_mode == WB_SYNC_NONE) {
+ u64 num_dirty;
+ u64 start = 0;
+ unsigned long thresh = 96 * 1024 * 1024;
+
+ if (wbc->for_kupdate)
+ return 0;
+
+ if (current_is_pdflush()) {
+ thresh = 96 * 1024 * 1024;
+ } else {
+ thresh = 8 * 1024 * 1024;
+ }
+ num_dirty = count_range_bits(tree, &start, (u64)-1,
+ thresh, EXTENT_DIRTY);
+ if (num_dirty < thresh) {
+ return 0;
}
- } else {
- node = btrfs_buffer_node(bh);
- memcpy(node->header.csum, result, BTRFS_CRC32_SIZE);
}
- return 0;
+ return extent_writepages(tree, mapping, btree_get_extent, wbc);
}
+int btree_readpage(struct file *file, struct page *page)
+{
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
+ return extent_read_full_page(tree, page, btree_get_extent);
+}
+
+static int btree_releasepage(struct page *page, gfp_t gfp_flags)
+{
+ struct extent_io_tree *tree;
+ struct extent_map_tree *map;
+ int ret;
+
+ if (page_count(page) > 3) {
+ /* once for page->private, once for the caller, once
+ * once for the page cache
+ */
+ return 0;
+ }
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
+ map = &BTRFS_I(page->mapping->host)->extent_tree;
+ ret = try_release_extent_mapping(map, tree, page, gfp_flags);
+ if (ret == 1) {
+ invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
+ ClearPagePrivate(page);
+ set_page_private(page, 0);
+ page_cache_release(page);
+ }
+ return ret;
+}
+
+static void btree_invalidatepage(struct page *page, unsigned long offset)
+{
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
+ extent_invalidatepage(tree, page, offset);
+ btree_releasepage(page, GFP_NOFS);
+}
+
+#if 0
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
struct buffer_head *bh;
} while (bh != head);
return block_write_full_page(page, btree_get_block, wbc);
}
-
-static int btree_readpage(struct file * file, struct page * page)
-{
- return block_read_full_page(page, btree_get_block);
-}
+#endif
static struct address_space_operations btree_aops = {
.readpage = btree_readpage,
.writepage = btree_writepage,
+ .writepages = btree_writepages,
+ .releasepage = btree_releasepage,
+ .invalidatepage = btree_invalidatepage,
.sync_page = block_sync_page,
};
-int readahead_tree_block(struct btrfs_root *root, u64 blocknr)
+int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
{
- struct buffer_head *bh = NULL;
+ struct extent_buffer *buf = NULL;
+ struct inode *btree_inode = root->fs_info->btree_inode;
int ret = 0;
- bh = btrfs_find_create_tree_block(root, blocknr);
- if (!bh)
+ buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
+ if (!buf)
return 0;
- if (buffer_uptodate(bh)) {
- ret = 1;
- goto done;
- }
- if (test_set_buffer_locked(bh)) {
- ret = 1;
- goto done;
- }
- if (!buffer_uptodate(bh)) {
- get_bh(bh);
- bh->b_end_io = end_buffer_read_sync;
- submit_bh(READ, bh);
- } else {
- unlock_buffer(bh);
- ret = 1;
- }
-done:
- brelse(bh);
+ read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
+ buf, 0, 0, btree_get_extent, 0);
+ free_extent_buffer(buf);
return ret;
}
-struct buffer_head *read_tree_block(struct btrfs_root *root, u64 blocknr)
+static int close_all_devices(struct btrfs_fs_info *fs_info)
{
- struct buffer_head *bh = NULL;
+ struct list_head *list;
+ struct list_head *next;
+ struct btrfs_device *device;
- bh = btrfs_find_create_tree_block(root, blocknr);
- if (!bh)
- return bh;
- if (buffer_uptodate(bh))
- goto uptodate;
- lock_buffer(bh);
- if (!buffer_uptodate(bh)) {
- get_bh(bh);
- bh->b_end_io = end_buffer_read_sync;
- submit_bh(READ, bh);
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh))
- goto fail;
- } else {
- unlock_buffer(bh);
+ list = &fs_info->fs_devices->devices;
+ list_for_each(next, list) {
+ device = list_entry(next, struct btrfs_device, dev_list);
+ if (device->bdev && device->bdev != fs_info->sb->s_bdev)
+ close_bdev_excl(device->bdev);
+ device->bdev = NULL;
}
-uptodate:
- if (!buffer_checked(bh)) {
- csum_tree_block(root, bh, 1);
- set_buffer_checked(bh);
+ return 0;
+}
+
+int btrfs_verify_block_csum(struct btrfs_root *root,
+ struct extent_buffer *buf)
+{
+ return btrfs_buffer_uptodate(buf);
+}
+
+struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
+ u64 bytenr, u32 blocksize)
+{
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ struct extent_buffer *eb;
+ eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
+ bytenr, blocksize, GFP_NOFS);
+ return eb;
+}
+
+struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
+ u64 bytenr, u32 blocksize)
+{
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ struct extent_buffer *eb;
+
+ eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
+ bytenr, blocksize, NULL, GFP_NOFS);
+ return eb;
+}
+
+
+struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
+ u32 blocksize)
+{
+ struct extent_buffer *buf = NULL;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ struct extent_io_tree *io_tree;
+ int ret;
+
+ io_tree = &BTRFS_I(btree_inode)->io_tree;
+
+ buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
+ if (!buf)
+ return NULL;
+
+ ret = btree_read_extent_buffer_pages(root, buf, 0);
+
+ if (ret == 0) {
+ buf->flags |= EXTENT_UPTODATE;
}
- if (check_tree_block(root, bh))
- goto fail;
- return bh;
-fail:
- brelse(bh);
- return NULL;
+ return buf;
+
}
int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
- struct buffer_head *buf)
+ struct extent_buffer *buf)
{
- WARN_ON(atomic_read(&buf->b_count) == 0);
- clear_buffer_dirty(buf);
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ if (btrfs_header_generation(buf) ==
+ root->fs_info->running_transaction->transid)
+ clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
+ buf);
return 0;
}
-static int __setup_root(int blocksize,
- struct btrfs_root *root,
+int wait_on_tree_block_writeback(struct btrfs_root *root,
+ struct extent_buffer *buf)
+{
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
+ buf);
+ return 0;
+}
+
+static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
+ u32 stripesize, struct btrfs_root *root,
struct btrfs_fs_info *fs_info,
u64 objectid)
{
root->node = NULL;
root->inode = NULL;
root->commit_root = NULL;
- root->blocksize = blocksize;
+ root->sectorsize = sectorsize;
+ root->nodesize = nodesize;
+ root->leafsize = leafsize;
+ root->stripesize = stripesize;
root->ref_cows = 0;
+ root->track_dirty = 0;
+
root->fs_info = fs_info;
root->objectid = objectid;
root->last_trans = 0;
root->highest_inode = 0;
root->last_inode_alloc = 0;
+ root->name = NULL;
+ root->in_sysfs = 0;
+
+ INIT_LIST_HEAD(&root->dirty_list);
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
+ memset(&root->defrag_progress, 0, sizeof(root->defrag_progress));
+ memset(&root->root_kobj, 0, sizeof(root->root_kobj));
+ init_completion(&root->kobj_unregister);
+ root->defrag_running = 0;
+ root->defrag_level = 0;
root->root_key.objectid = objectid;
return 0;
}
-static int find_and_setup_root(int blocksize,
- struct btrfs_root *tree_root,
+static int find_and_setup_root(struct btrfs_root *tree_root,
struct btrfs_fs_info *fs_info,
u64 objectid,
struct btrfs_root *root)
{
int ret;
+ u32 blocksize;
- __setup_root(blocksize, root, fs_info, objectid);
+ __setup_root(tree_root->nodesize, tree_root->leafsize,
+ tree_root->sectorsize, tree_root->stripesize,
+ root, fs_info, objectid);
ret = btrfs_find_last_root(tree_root, objectid,
&root->root_item, &root->root_key);
BUG_ON(ret);
- root->node = read_tree_block(root,
- btrfs_root_blocknr(&root->root_item));
+ blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
+ root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
+ blocksize);
BUG_ON(!root->node);
return 0;
}
struct btrfs_root *root;
struct btrfs_root *tree_root = fs_info->tree_root;
struct btrfs_path *path;
- struct btrfs_leaf *l;
+ struct extent_buffer *l;
u64 highest_inode;
+ u32 blocksize;
int ret = 0;
root = kzalloc(sizeof(*root), GFP_NOFS);
if (!root)
return ERR_PTR(-ENOMEM);
if (location->offset == (u64)-1) {
- ret = find_and_setup_root(fs_info->sb->s_blocksize,
- fs_info->tree_root, fs_info,
+ ret = find_and_setup_root(tree_root, fs_info,
location->objectid, root);
if (ret) {
kfree(root);
goto insert;
}
- __setup_root(fs_info->sb->s_blocksize, root, fs_info,
- location->objectid);
+ __setup_root(tree_root->nodesize, tree_root->leafsize,
+ tree_root->sectorsize, tree_root->stripesize,
+ root, fs_info, location->objectid);
path = btrfs_alloc_path();
BUG_ON(!path);
ret = -ENOENT;
goto out;
}
- l = btrfs_buffer_leaf(path->nodes[0]);
- memcpy(&root->root_item,
- btrfs_item_ptr(l, path->slots[0], struct btrfs_root_item),
+ l = path->nodes[0];
+ read_extent_buffer(l, &root->root_item,
+ btrfs_item_ptr_offset(l, path->slots[0]),
sizeof(root->root_item));
memcpy(&root->root_key, location, sizeof(*location));
ret = 0;
kfree(root);
return ERR_PTR(ret);
}
- root->node = read_tree_block(root,
- btrfs_root_blocknr(&root->root_item));
+ blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
+ root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
+ blocksize);
BUG_ON(!root->node);
insert:
root->ref_cows = 1;
return root;
}
-struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
- struct btrfs_key *location)
+struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info,
+ u64 root_objectid)
+{
+ struct btrfs_root *root;
+
+ if (root_objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return fs_info->tree_root;
+ if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID)
+ return fs_info->extent_root;
+
+ root = radix_tree_lookup(&fs_info->fs_roots_radix,
+ (unsigned long)root_objectid);
+ return root;
+}
+
+struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location)
{
struct btrfs_root *root;
int ret;
+ if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
+ return fs_info->tree_root;
+ if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
+ return fs_info->extent_root;
+
root = radix_tree_lookup(&fs_info->fs_roots_radix,
(unsigned long)location->objectid);
if (root)
(unsigned long)root->root_key.objectid,
root);
if (ret) {
- brelse(root->node);
+ free_extent_buffer(root->node);
kfree(root);
return ERR_PTR(ret);
}
+ ret = btrfs_find_dead_roots(fs_info->tree_root,
+ root->root_key.objectid, root);
+ BUG_ON(ret);
+
return root;
}
-struct btrfs_root *open_ctree(struct super_block *sb)
+struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
+ struct btrfs_key *location,
+ const char *name, int namelen)
+{
+ struct btrfs_root *root;
+ int ret;
+
+ root = btrfs_read_fs_root_no_name(fs_info, location);
+ if (!root)
+ return NULL;
+
+ if (root->in_sysfs)
+ return root;
+
+ ret = btrfs_set_root_name(root, name, namelen);
+ if (ret) {
+ free_extent_buffer(root->node);
+ kfree(root);
+ return ERR_PTR(ret);
+ }
+
+ ret = btrfs_sysfs_add_root(root);
+ if (ret) {
+ free_extent_buffer(root->node);
+ kfree(root->name);
+ kfree(root);
+ return ERR_PTR(ret);
+ }
+ root->in_sysfs = 1;
+ return root;
+}
+#if 0
+static int add_hasher(struct btrfs_fs_info *info, char *type) {
+ struct btrfs_hasher *hasher;
+
+ hasher = kmalloc(sizeof(*hasher), GFP_NOFS);
+ if (!hasher)
+ return -ENOMEM;
+ hasher->hash_tfm = crypto_alloc_hash(type, 0, CRYPTO_ALG_ASYNC);
+ if (!hasher->hash_tfm) {
+ kfree(hasher);
+ return -EINVAL;
+ }
+ spin_lock(&info->hash_lock);
+ list_add(&hasher->list, &info->hashers);
+ spin_unlock(&info->hash_lock);
+ return 0;
+}
+#endif
+
+static int btrfs_congested_fn(void *congested_data, int bdi_bits)
+{
+ struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
+ int ret = 0;
+ struct list_head *cur;
+ struct btrfs_device *device;
+ struct backing_dev_info *bdi;
+
+ list_for_each(cur, &info->fs_devices->devices) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ bdi = blk_get_backing_dev_info(device->bdev);
+ if (bdi && bdi_congested(bdi, bdi_bits)) {
+ ret = 1;
+ break;
+ }
+ }
+ return ret;
+}
+
+void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
+{
+ struct list_head *cur;
+ struct btrfs_device *device;
+ struct btrfs_fs_info *info;
+
+ info = (struct btrfs_fs_info *)bdi->unplug_io_data;
+ list_for_each(cur, &info->fs_devices->devices) {
+ device = list_entry(cur, struct btrfs_device, dev_list);
+ bdi = blk_get_backing_dev_info(device->bdev);
+ if (bdi->unplug_io_fn) {
+ bdi->unplug_io_fn(bdi, page);
+ }
+ }
+}
+
+static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
+ bdi_init(bdi);
+#endif
+ bdi->ra_pages = default_backing_dev_info.ra_pages * 4;
+ bdi->state = 0;
+ bdi->capabilities = default_backing_dev_info.capabilities;
+ bdi->unplug_io_fn = btrfs_unplug_io_fn;
+ bdi->unplug_io_data = info;
+ bdi->congested_fn = btrfs_congested_fn;
+ bdi->congested_data = info;
+ return 0;
+}
+
+static int bio_ready_for_csum(struct bio *bio)
+{
+ u64 length = 0;
+ u64 buf_len = 0;
+ u64 start = 0;
+ struct page *page;
+ struct extent_io_tree *io_tree = NULL;
+ struct btrfs_fs_info *info = NULL;
+ struct bio_vec *bvec;
+ int i;
+ int ret;
+
+ bio_for_each_segment(bvec, bio, i) {
+ page = bvec->bv_page;
+ if (page->private == EXTENT_PAGE_PRIVATE) {
+ length += bvec->bv_len;
+ continue;
+ }
+ if (!page->private) {
+ length += bvec->bv_len;
+ continue;
+ }
+ length = bvec->bv_len;
+ buf_len = page->private >> 2;
+ start = page_offset(page) + bvec->bv_offset;
+ io_tree = &BTRFS_I(page->mapping->host)->io_tree;
+ info = BTRFS_I(page->mapping->host)->root->fs_info;
+ }
+ /* are we fully contained in this bio? */
+ if (buf_len <= length)
+ return 1;
+
+ ret = extent_range_uptodate(io_tree, start + length,
+ start + buf_len - 1);
+ if (ret == 1)
+ return ret;
+ return ret;
+}
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+static void btrfs_end_io_csum(void *p)
+#else
+static void btrfs_end_io_csum(struct work_struct *work)
+#endif
{
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+ struct btrfs_fs_info *fs_info = p;
+#else
+ struct btrfs_fs_info *fs_info = container_of(work,
+ struct btrfs_fs_info,
+ end_io_work);
+#endif
+ unsigned long flags;
+ struct end_io_wq *end_io_wq;
+ struct bio *bio;
+ struct list_head *next;
+ int error;
+ int was_empty;
+
+ while(1) {
+ spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
+ if (list_empty(&fs_info->end_io_work_list)) {
+ spin_unlock_irqrestore(&fs_info->end_io_work_lock,
+ flags);
+ return;
+ }
+ next = fs_info->end_io_work_list.next;
+ list_del(next);
+ spin_unlock_irqrestore(&fs_info->end_io_work_lock, flags);
+
+ end_io_wq = list_entry(next, struct end_io_wq, list);
+
+ bio = end_io_wq->bio;
+ if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
+ spin_lock_irqsave(&fs_info->end_io_work_lock, flags);
+ was_empty = list_empty(&fs_info->end_io_work_list);
+ list_add_tail(&end_io_wq->list,
+ &fs_info->end_io_work_list);
+ spin_unlock_irqrestore(&fs_info->end_io_work_lock,
+ flags);
+ if (was_empty)
+ return;
+ continue;
+ }
+ error = end_io_wq->error;
+ bio->bi_private = end_io_wq->private;
+ bio->bi_end_io = end_io_wq->end_io;
+ kfree(end_io_wq);
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ bio_endio(bio, bio->bi_size, error);
+#else
+ bio_endio(bio, error);
+#endif
+ }
+}
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+static void btrfs_async_submit_work(void *p)
+#else
+static void btrfs_async_submit_work(struct work_struct *work)
+#endif
+{
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+ struct btrfs_fs_info *fs_info = p;
+#else
+ struct btrfs_fs_info *fs_info = container_of(work,
+ struct btrfs_fs_info,
+ async_submit_work);
+#endif
+ struct async_submit_bio *async;
+ struct list_head *next;
+
+ while(1) {
+ spin_lock(&fs_info->async_submit_work_lock);
+ if (list_empty(&fs_info->async_submit_work_list)) {
+ spin_unlock(&fs_info->async_submit_work_lock);
+ return;
+ }
+ next = fs_info->async_submit_work_list.next;
+ list_del(next);
+ spin_unlock(&fs_info->async_submit_work_lock);
+
+ async = list_entry(next, struct async_submit_bio, list);
+ async->submit_bio_hook(async->inode, async->rw, async->bio,
+ async->mirror_num);
+ kfree(async);
+ }
+}
+
+struct btrfs_root *open_ctree(struct super_block *sb,
+ struct btrfs_fs_devices *fs_devices)
+{
+ u32 sectorsize;
+ u32 nodesize;
+ u32 leafsize;
+ u32 blocksize;
+ u32 stripesize;
struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
- struct btrfs_fs_info *fs_info = kmalloc(sizeof(*fs_info),
+ struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
+ GFP_NOFS);
+ struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
GFP_NOFS);
+ struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
+ GFP_NOFS);
int ret;
- int err = -EIO;
+ int err = -EINVAL;
struct btrfs_super_block *disk_super;
if (!extent_root || !tree_root || !fs_info) {
err = -ENOMEM;
goto fail;
}
- init_bit_radix(&fs_info->pinned_radix);
- init_bit_radix(&fs_info->pending_del_radix);
- init_bit_radix(&fs_info->extent_map_radix);
+ end_io_workqueue = create_workqueue("btrfs-end-io");
+ BUG_ON(!end_io_workqueue);
+ async_submit_workqueue = create_workqueue("btrfs-async-submit");
+
INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_NOFS);
- INIT_RADIX_TREE(&fs_info->block_group_radix, GFP_KERNEL);
- INIT_RADIX_TREE(&fs_info->block_group_data_radix, GFP_KERNEL);
INIT_LIST_HEAD(&fs_info->trans_list);
INIT_LIST_HEAD(&fs_info->dead_roots);
- sb_set_blocksize(sb, 4096);
- fs_info->running_transaction = NULL;
+ INIT_LIST_HEAD(&fs_info->hashers);
+ INIT_LIST_HEAD(&fs_info->end_io_work_list);
+ INIT_LIST_HEAD(&fs_info->async_submit_work_list);
+ spin_lock_init(&fs_info->hash_lock);
+ spin_lock_init(&fs_info->end_io_work_lock);
+ spin_lock_init(&fs_info->async_submit_work_lock);
+ spin_lock_init(&fs_info->delalloc_lock);
+ spin_lock_init(&fs_info->new_trans_lock);
+
+ init_completion(&fs_info->kobj_unregister);
+ sb_set_blocksize(sb, BTRFS_SUPER_INFO_SIZE);
fs_info->tree_root = tree_root;
fs_info->extent_root = extent_root;
+ fs_info->chunk_root = chunk_root;
+ fs_info->dev_root = dev_root;
+ fs_info->fs_devices = fs_devices;
+ INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
+ INIT_LIST_HEAD(&fs_info->space_info);
+ btrfs_mapping_init(&fs_info->mapping_tree);
fs_info->sb = sb;
+ fs_info->max_extent = (u64)-1;
+ fs_info->max_inline = 8192 * 1024;
+ setup_bdi(fs_info, &fs_info->bdi);
fs_info->btree_inode = new_inode(sb);
fs_info->btree_inode->i_ino = 1;
fs_info->btree_inode->i_nlink = 1;
fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
+ fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi;
+
+ extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
+ fs_info->btree_inode->i_mapping,
+ GFP_NOFS);
+ extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
+ GFP_NOFS);
+
+ BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
+
+ extent_io_tree_init(&fs_info->free_space_cache,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
+ extent_io_tree_init(&fs_info->block_group_cache,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
+ extent_io_tree_init(&fs_info->pinned_extents,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
+ extent_io_tree_init(&fs_info->pending_del,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
+ extent_io_tree_init(&fs_info->extent_ins,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->do_barriers = 1;
- fs_info->extent_tree_insert_nr = 0;
- fs_info->extent_tree_prealloc_nr = 0;
- fs_info->closing = 0;
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
+ INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum, fs_info);
+ INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work,
+ fs_info);
+ INIT_WORK(&fs_info->trans_work, btrfs_transaction_cleaner, fs_info);
+#else
+ INIT_WORK(&fs_info->end_io_work, btrfs_end_io_csum);
+ INIT_WORK(&fs_info->async_submit_work, btrfs_async_submit_work);
INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
+#endif
BTRFS_I(fs_info->btree_inode)->root = tree_root;
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
sizeof(struct btrfs_key));
mutex_init(&fs_info->trans_mutex);
mutex_init(&fs_info->fs_mutex);
- __setup_root(sb->s_blocksize, tree_root,
+#if 0
+ ret = add_hasher(fs_info, "crc32c");
+ if (ret) {
+ printk("btrfs: failed hash setup, modprobe cryptomgr?\n");
+ err = -ENOMEM;
+ goto fail_iput;
+ }
+#endif
+ __setup_root(4096, 4096, 4096, 4096, tree_root,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
fs_info->sb_buffer = read_tree_block(tree_root,
- BTRFS_SUPER_INFO_OFFSET /
- sb->s_blocksize);
+ BTRFS_SUPER_INFO_OFFSET,
+ 4096);
if (!fs_info->sb_buffer)
goto fail_iput;
- disk_super = (struct btrfs_super_block *)fs_info->sb_buffer->b_data;
- fs_info->disk_super = disk_super;
- memcpy(&fs_info->super_copy, disk_super, sizeof(fs_info->super_copy));
+ read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
+ sizeof(fs_info->super_copy));
+
+ read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
+ (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
+ BTRFS_FSID_SIZE);
+
+ disk_super = &fs_info->super_copy;
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
- i_size_write(fs_info->btree_inode,
- btrfs_super_total_blocks(disk_super) <<
- fs_info->btree_inode->i_blkbits);
+ if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
+ printk("Btrfs: wanted %llu devices, but found %llu\n",
+ (unsigned long long)btrfs_super_num_devices(disk_super),
+ (unsigned long long)fs_devices->num_devices);
+ goto fail_sb_buffer;
+ }
+ nodesize = btrfs_super_nodesize(disk_super);
+ leafsize = btrfs_super_leafsize(disk_super);
+ sectorsize = btrfs_super_sectorsize(disk_super);
+ stripesize = btrfs_super_stripesize(disk_super);
+ tree_root->nodesize = nodesize;
+ tree_root->leafsize = leafsize;
+ tree_root->sectorsize = sectorsize;
+ tree_root->stripesize = stripesize;
+ sb_set_blocksize(sb, sectorsize);
+ i_size_write(fs_info->btree_inode,
+ btrfs_super_total_bytes(disk_super));
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
sizeof(disk_super->magic))) {
printk("btrfs: valid FS not found on %s\n", sb->s_id);
goto fail_sb_buffer;
}
+
+ mutex_lock(&fs_info->fs_mutex);
+
+ ret = btrfs_read_sys_array(tree_root);
+ BUG_ON(ret);
+
+ blocksize = btrfs_level_size(tree_root,
+ btrfs_super_chunk_root_level(disk_super));
+
+ __setup_root(nodesize, leafsize, sectorsize, stripesize,
+ chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
+
+ chunk_root->node = read_tree_block(chunk_root,
+ btrfs_super_chunk_root(disk_super),
+ blocksize);
+ BUG_ON(!chunk_root->node);
+
+ read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
+ (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
+ BTRFS_UUID_SIZE);
+
+ ret = btrfs_read_chunk_tree(chunk_root);
+ BUG_ON(ret);
+
+ blocksize = btrfs_level_size(tree_root,
+ btrfs_super_root_level(disk_super));
+
+
tree_root->node = read_tree_block(tree_root,
- btrfs_super_root(disk_super));
+ btrfs_super_root(disk_super),
+ blocksize);
if (!tree_root->node)
goto fail_sb_buffer;
- mutex_lock(&fs_info->fs_mutex);
- ret = find_and_setup_root(sb->s_blocksize, tree_root, fs_info,
+
+ ret = find_and_setup_root(tree_root, fs_info,
BTRFS_EXTENT_TREE_OBJECTID, extent_root);
- if (ret) {
- mutex_unlock(&fs_info->fs_mutex);
+ if (ret)
goto fail_tree_root;
- }
+ extent_root->track_dirty = 1;
+
+ ret = find_and_setup_root(tree_root, fs_info,
+ BTRFS_DEV_TREE_OBJECTID, dev_root);
+ dev_root->track_dirty = 1;
+
+ if (ret)
+ goto fail_extent_root;
btrfs_read_block_groups(extent_root);
fs_info->generation = btrfs_super_generation(disk_super) + 1;
- ret = btrfs_find_dead_roots(tree_root);
- if (ret)
- goto fail_tree_root;
+ fs_info->data_alloc_profile = (u64)-1;
+ fs_info->metadata_alloc_profile = (u64)-1;
+ fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
+
mutex_unlock(&fs_info->fs_mutex);
return tree_root;
+fail_extent_root:
+ free_extent_buffer(extent_root->node);
fail_tree_root:
- btrfs_block_release(tree_root, tree_root->node);
+ mutex_unlock(&fs_info->fs_mutex);
+ free_extent_buffer(tree_root->node);
fail_sb_buffer:
- btrfs_block_release(tree_root, fs_info->sb_buffer);
+ free_extent_buffer(fs_info->sb_buffer);
+ extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
fail_iput:
iput(fs_info->btree_inode);
fail:
+ close_all_devices(fs_info);
kfree(extent_root);
kfree(tree_root);
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
+ bdi_destroy(&fs_info->bdi);
+#endif
kfree(fs_info);
return ERR_PTR(err);
}
-int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
- *root)
+static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate)
{
+ char b[BDEVNAME_SIZE];
+
+ if (uptodate) {
+ set_buffer_uptodate(bh);
+ } else {
+ if (!buffer_eopnotsupp(bh) && printk_ratelimit()) {
+ printk(KERN_WARNING "lost page write due to "
+ "I/O error on %s\n",
+ bdevname(bh->b_bdev, b));
+ }
+ set_buffer_write_io_error(bh);
+ clear_buffer_uptodate(bh);
+ }
+ unlock_buffer(bh);
+ put_bh(bh);
+}
+
+int write_all_supers(struct btrfs_root *root)
+{
+ struct list_head *cur;
+ struct list_head *head = &root->fs_info->fs_devices->devices;
+ struct btrfs_device *dev;
+ struct extent_buffer *sb;
+ struct btrfs_dev_item *dev_item;
+ struct buffer_head *bh;
int ret;
- struct buffer_head *bh = root->fs_info->sb_buffer;
-
- lock_buffer(bh);
- WARN_ON(atomic_read(&bh->b_count) < 1);
- clear_buffer_dirty(bh);
- csum_tree_block(root, bh, 0);
- bh->b_end_io = end_buffer_write_sync;
- get_bh(bh);
- if (root->fs_info->do_barriers)
- ret = submit_bh(WRITE_BARRIER, bh);
- else
- ret = submit_bh(WRITE, bh);
- if (ret == -EOPNOTSUPP) {
+ int do_barriers;
+
+ do_barriers = !btrfs_test_opt(root, NOBARRIER);
+
+ sb = root->fs_info->sb_buffer;
+ dev_item = (struct btrfs_dev_item *)offsetof(struct btrfs_super_block,
+ dev_item);
+ list_for_each(cur, head) {
+ dev = list_entry(cur, struct btrfs_device, dev_list);
+ btrfs_set_device_type(sb, dev_item, dev->type);
+ btrfs_set_device_id(sb, dev_item, dev->devid);
+ btrfs_set_device_total_bytes(sb, dev_item, dev->total_bytes);
+ btrfs_set_device_bytes_used(sb, dev_item, dev->bytes_used);
+ btrfs_set_device_io_align(sb, dev_item, dev->io_align);
+ btrfs_set_device_io_width(sb, dev_item, dev->io_width);
+ btrfs_set_device_sector_size(sb, dev_item, dev->sector_size);
+ write_extent_buffer(sb, dev->uuid,
+ (unsigned long)btrfs_device_uuid(dev_item),
+ BTRFS_UUID_SIZE);
+
+ btrfs_set_header_flag(sb, BTRFS_HEADER_FLAG_WRITTEN);
+ csum_tree_block(root, sb, 0);
+
+ bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET /
+ root->fs_info->sb->s_blocksize,
+ BTRFS_SUPER_INFO_SIZE);
+
+ read_extent_buffer(sb, bh->b_data, 0, BTRFS_SUPER_INFO_SIZE);
+ dev->pending_io = bh;
+
get_bh(bh);
- lock_buffer(bh);
set_buffer_uptodate(bh);
- root->fs_info->do_barriers = 0;
- ret = submit_bh(WRITE, bh);
+ lock_buffer(bh);
+ bh->b_end_io = btrfs_end_buffer_write_sync;
+
+ if (do_barriers && dev->barriers) {
+ ret = submit_bh(WRITE_BARRIER, bh);
+ if (ret == -EOPNOTSUPP) {
+ printk("btrfs: disabling barriers on dev %s\n",
+ dev->name);
+ set_buffer_uptodate(bh);
+ dev->barriers = 0;
+ get_bh(bh);
+ lock_buffer(bh);
+ ret = submit_bh(WRITE, bh);
+ }
+ } else {
+ ret = submit_bh(WRITE, bh);
+ }
+ BUG_ON(ret);
}
- wait_on_buffer(bh);
- if (!buffer_uptodate(bh)) {
- WARN_ON(1);
- return -EIO;
+
+ list_for_each(cur, head) {
+ dev = list_entry(cur, struct btrfs_device, dev_list);
+ BUG_ON(!dev->pending_io);
+ bh = dev->pending_io;
+ wait_on_buffer(bh);
+ if (!buffer_uptodate(dev->pending_io)) {
+ if (do_barriers && dev->barriers) {
+ printk("btrfs: disabling barriers on dev %s\n",
+ dev->name);
+ set_buffer_uptodate(bh);
+ get_bh(bh);
+ lock_buffer(bh);
+ dev->barriers = 0;
+ ret = submit_bh(WRITE, bh);
+ BUG_ON(ret);
+ wait_on_buffer(bh);
+ BUG_ON(!buffer_uptodate(bh));
+ } else {
+ BUG();
+ }
+
+ }
+ dev->pending_io = NULL;
+ brelse(bh);
}
return 0;
}
+int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
+ *root)
+{
+ int ret;
+
+ ret = write_all_supers(root);
+#if 0
+ if (!btrfs_test_opt(root, NOBARRIER))
+ blkdev_issue_flush(sb->s_bdev, NULL);
+ set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
+ ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
+ super->start, super->len);
+ if (!btrfs_test_opt(root, NOBARRIER))
+ blkdev_issue_flush(sb->s_bdev, NULL);
+#endif
+ return ret;
+}
+
int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root)
{
radix_tree_delete(&fs_info->fs_roots_radix,
(unsigned long)root->root_key.objectid);
+ if (root->in_sysfs)
+ btrfs_sysfs_del_root(root);
if (root->inode)
iput(root->inode);
if (root->node)
- brelse(root->node);
+ free_extent_buffer(root->node);
if (root->commit_root)
- brelse(root->commit_root);
+ free_extent_buffer(root->commit_root);
+ if (root->name)
+ kfree(root->name);
kfree(root);
return 0;
}
fs_info->closing = 1;
btrfs_transaction_flush_work(root);
mutex_lock(&fs_info->fs_mutex);
+ btrfs_defrag_dirty_roots(root->fs_info);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
/* run commit again to drop the original snapshot */
write_ctree_super(NULL, root);
mutex_unlock(&fs_info->fs_mutex);
+ if (fs_info->delalloc_bytes) {
+ printk("btrfs: at unmount delalloc count %Lu\n",
+ fs_info->delalloc_bytes);
+ }
if (fs_info->extent_root->node)
- btrfs_block_release(fs_info->extent_root,
- fs_info->extent_root->node);
+ free_extent_buffer(fs_info->extent_root->node);
+
if (fs_info->tree_root->node)
- btrfs_block_release(fs_info->tree_root,
- fs_info->tree_root->node);
- btrfs_block_release(root, fs_info->sb_buffer);
- truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
- iput(fs_info->btree_inode);
+ free_extent_buffer(fs_info->tree_root->node);
+
+ if (root->fs_info->chunk_root->node);
+ free_extent_buffer(root->fs_info->chunk_root->node);
+
+ if (root->fs_info->dev_root->node);
+ free_extent_buffer(root->fs_info->dev_root->node);
+
+ free_extent_buffer(fs_info->sb_buffer);
btrfs_free_block_groups(root->fs_info);
del_fs_roots(fs_info);
+
+ filemap_write_and_wait(fs_info->btree_inode->i_mapping);
+
+ extent_io_tree_empty_lru(&fs_info->free_space_cache);
+ extent_io_tree_empty_lru(&fs_info->block_group_cache);
+ extent_io_tree_empty_lru(&fs_info->pinned_extents);
+ extent_io_tree_empty_lru(&fs_info->pending_del);
+ extent_io_tree_empty_lru(&fs_info->extent_ins);
+ extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
+
+ truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
+ flush_workqueue(end_io_workqueue);
+ destroy_workqueue(end_io_workqueue);
+
+ flush_workqueue(async_submit_workqueue);
+ destroy_workqueue(async_submit_workqueue);
+
+ iput(fs_info->btree_inode);
+#if 0
+ while(!list_empty(&fs_info->hashers)) {
+ struct btrfs_hasher *hasher;
+ hasher = list_entry(fs_info->hashers.next, struct btrfs_hasher,
+ hashers);
+ list_del(&hasher->hashers);
+ crypto_free_hash(&fs_info->hash_tfm);
+ kfree(hasher);
+ }
+#endif
+ close_all_devices(fs_info);
+ btrfs_mapping_tree_free(&fs_info->mapping_tree);
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
+ bdi_destroy(&fs_info->bdi);
+#endif
+
kfree(fs_info->extent_root);
kfree(fs_info->tree_root);
+ kfree(fs_info->chunk_root);
+ kfree(fs_info->dev_root);
return 0;
}
-void btrfs_mark_buffer_dirty(struct buffer_head *bh)
+int btrfs_buffer_uptodate(struct extent_buffer *buf)
{
- struct btrfs_root *root = BTRFS_I(bh->b_page->mapping->host)->root;
- u64 transid = btrfs_header_generation(btrfs_buffer_header(bh));
- WARN_ON(!atomic_read(&bh->b_count));
+ struct inode *btree_inode = buf->first_page->mapping->host;
+ return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
+}
+
+int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
+{
+ struct inode *btree_inode = buf->first_page->mapping->host;
+ return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
+ buf);
+}
+
+void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
+{
+ struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
+ u64 transid = btrfs_header_generation(buf);
+ struct inode *btree_inode = root->fs_info->btree_inode;
+
if (transid != root->fs_info->generation) {
printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
- (unsigned long long)bh->b_blocknr,
+ (unsigned long long)buf->start,
transid, root->fs_info->generation);
WARN_ON(1);
}
- mark_buffer_dirty(bh);
+ set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
+}
+
+void btrfs_throttle(struct btrfs_root *root)
+{
+ struct backing_dev_info *bdi;
+
+ bdi = root->fs_info->sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
+ if (root->fs_info->throttles && bdi_write_congested(bdi)) {
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18)
+ congestion_wait(WRITE, HZ/20);
+#else
+ blk_congestion_wait(WRITE, HZ/20);
+#endif
+ }
+}
+
+void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr)
+{
+ balance_dirty_pages_ratelimited_nr(
+ root->fs_info->btree_inode->i_mapping, 1);
+}
+
+void btrfs_set_buffer_defrag(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;
+ set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
+ buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
+}
+
+void btrfs_set_buffer_defrag_done(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;
+ set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
+ buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
+ GFP_NOFS);
+}
+
+int btrfs_buffer_defrag(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;
+ return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
+ buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
+}
+
+int btrfs_buffer_defrag_done(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;
+ return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
+ buf->start, buf->start + buf->len - 1,
+ EXTENT_DEFRAG_DONE, 0);
}
-void btrfs_block_release(struct btrfs_root *root, struct buffer_head *buf)
+int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
{
- brelse(buf);
+ struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
+ buf->start, buf->start + buf->len - 1,
+ EXTENT_DEFRAG_DONE, GFP_NOFS);
}
-void btrfs_btree_balance_dirty(struct btrfs_root *root)
+int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
{
- balance_dirty_pages_ratelimited(root->fs_info->btree_inode->i_mapping);
+ struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
+ struct inode *btree_inode = root->fs_info->btree_inode;
+ return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
+ buf->start, buf->start + buf->len - 1,
+ EXTENT_DEFRAG, GFP_NOFS);
}
+
+int btrfs_read_buffer(struct extent_buffer *buf)
+{
+ struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
+ int ret;
+ ret = btree_read_extent_buffer_pages(root, buf, 0);
+ if (ret == 0) {
+ buf->flags |= EXTENT_UPTODATE;
+ }
+ return ret;
+}
+
+static struct extent_io_ops btree_extent_io_ops = {
+ .writepage_io_hook = btree_writepage_io_hook,
+ .readpage_end_io_hook = btree_readpage_end_io_hook,
+ .submit_bio_hook = btree_submit_bio_hook,
+ /* note we're sharing with inode.c for the merge bio hook */
+ .merge_bio_hook = btrfs_merge_bio_hook,
+};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff