* Boston, MA 021110-1307, USA.
*/
+#include <linux/version.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/scatterlist.h>
#include <linux/writeback.h>
#include <linux/buffer_head.h> // for block_sync_page
#include <linux/workqueue.h>
+#include <linux/kthread.h>
+# include <linux/freezer.h>
#include "crc32c.h"
#include "ctree.h"
#include "disk-io.h"
#include "btrfs_inode.h"
#include "volumes.h"
#include "print-tree.h"
+#include "async-thread.h"
+#include "locking.h"
+#include "ref-cache.h"
+#include "tree-log.h"
#if 0
static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
#endif
static struct extent_io_ops btree_extent_io_ops;
-static struct workqueue_struct *end_io_workqueue;
-static struct workqueue_struct *async_submit_workqueue;
+static void end_workqueue_fn(struct btrfs_work *work);
+/*
+ * end_io_wq structs are used to do processing in task context when an IO is
+ * complete. This is used during reads to verify checksums, and it is used
+ * by writes to insert metadata for new file extents after IO is complete.
+ */
struct end_io_wq {
struct bio *bio;
bio_end_io_t *end_io;
int error;
int metadata;
struct list_head list;
+ struct btrfs_work work;
};
+/*
+ * async submit bios are used to offload expensive checksumming
+ * onto the worker threads. They checksum file and metadata bios
+ * just before they are sent down the IO stack.
+ */
struct async_submit_bio {
struct inode *inode;
struct bio *bio;
struct list_head list;
- extent_submit_bio_hook_t *submit_bio_hook;
+ extent_submit_bio_hook_t *submit_bio_start;
+ extent_submit_bio_hook_t *submit_bio_done;
int rw;
int mirror_num;
+ unsigned long bio_flags;
+ struct btrfs_work work;
};
+/*
+ * extents on the btree inode are pretty simple, there's one extent
+ * that covers the entire device
+ */
struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
size_t page_offset, u64 start, u64 len,
int create)
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
- spin_unlock(&em_tree->lock);
- if (em)
+ if (em) {
+ em->bdev =
+ BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
+ spin_unlock(&em_tree->lock);
goto out;
+ }
+ spin_unlock(&em_tree->lock);
em = alloc_extent_map(GFP_NOFS);
if (!em) {
}
em->start = 0;
em->len = (u64)-1;
+ em->block_len = (u64)-1;
em->block_start = 0;
- em->bdev = inode->i_sb->s_bdev;
+ em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev;
spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
*(__le32 *)result = ~cpu_to_le32(crc);
}
+/*
+ * compute the csum for a btree block, and either verify it or write it
+ * into the csum field of the block.
+ */
static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int verify)
{
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;
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",
+ "wanted %X found %X level %d\n",
root->fs_info->sb->s_id,
- buf->start, val, found, from_this_trans,
- btrfs_header_level(buf));
+ buf->start, val, found, btrfs_header_level(buf));
return 1;
}
} else {
return 0;
}
+/*
+ * we can't consider a given block up to date unless the transid of the
+ * block matches the transid in the parent node's pointer. This is how we
+ * detect blocks that either didn't get written at all or got written
+ * in the wrong place.
+ */
+static int verify_parent_transid(struct extent_io_tree *io_tree,
+ struct extent_buffer *eb, u64 parent_transid)
+{
+ int ret;
+
+ if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
+ return 0;
+
+ lock_extent(io_tree, eb->start, eb->start + eb->len - 1, GFP_NOFS);
+ if (extent_buffer_uptodate(io_tree, eb) &&
+ btrfs_header_generation(eb) == parent_transid) {
+ ret = 0;
+ goto out;
+ }
+ printk("parent transid verify failed on %llu wanted %llu found %llu\n",
+ (unsigned long long)eb->start,
+ (unsigned long long)parent_transid,
+ (unsigned long long)btrfs_header_generation(eb));
+ ret = 1;
+ clear_extent_buffer_uptodate(io_tree, eb);
+out:
+ unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
+ GFP_NOFS);
+ return ret;
+}
+
+/*
+ * helper to read a given tree block, doing retries as required when
+ * the checksums don't match and we have alternate mirrors to try.
+ */
static int btree_read_extent_buffer_pages(struct btrfs_root *root,
struct extent_buffer *eb,
- u64 start)
+ u64 start, u64 parent_transid)
{
struct extent_io_tree *io_tree;
int ret;
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);
+ if (!ret &&
+ !verify_parent_transid(io_tree, eb, parent_transid))
return ret;
- }
+printk("read extent buffer pages failed with ret %d mirror no %d\n", ret, mirror_num);
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);
+ if (num_copies == 1)
return ret;
- }
+
mirror_num++;
- if (mirror_num > num_copies) {
-printk("bailing at mirror %d of %d\n", mirror_num, num_copies);
+ if (mirror_num > num_copies)
return ret;
- }
}
-printk("read extent buffer page last\n");
return -EIO;
}
+/*
+ * checksum a dirty tree block before IO. This has extra checks to make
+ * sure we only fill in the checksum field in the first page of a multi-page block
+ */
int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
{
struct extent_io_tree *tree;
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);
+ ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
+ btrfs_header_generation(eb));
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",
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);
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)
{
}
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);
+ printk("bad tree block start %llu %llu\n",
+ (unsigned long long)found_start,
+ (unsigned long long)eb->start);
ret = -EIO;
goto err;
}
ret = -EIO;
goto err;
}
+ if (memcmp_extent_buffer(eb, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(eb),
+ BTRFS_FSID_SIZE)) {
+ printk("bad fsid on block %Lu\n", eb->start);
+ ret = -EIO;
+ goto err;
+ }
found_level = btrfs_header_level(eb);
ret = csum_tree_block(root, eb, 1);
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;
}
-#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
{
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
+ end_io_wq->work.func = end_workqueue_fn;
+ end_io_wq->work.flags = 0;
+ if (bio->bi_rw & (1 << BIO_RW))
+ btrfs_queue_worker(&fs_info->endio_write_workers,
+ &end_io_wq->work);
+ else
+ btrfs_queue_worker(&fs_info->endio_workers, &end_io_wq->work);
}
int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
return 0;
}
+unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info)
+{
+ unsigned long limit = min_t(unsigned long,
+ info->workers.max_workers,
+ info->fs_devices->open_devices);
+ return 256 * limit;
+}
+
+int btrfs_congested_async(struct btrfs_fs_info *info, int iodone)
+{
+ return atomic_read(&info->nr_async_bios) >
+ btrfs_async_submit_limit(info);
+}
+
+static void run_one_async_start(struct btrfs_work *work)
+{
+ struct btrfs_fs_info *fs_info;
+ struct async_submit_bio *async;
+
+ async = container_of(work, struct async_submit_bio, work);
+ fs_info = BTRFS_I(async->inode)->root->fs_info;
+ async->submit_bio_start(async->inode, async->rw, async->bio,
+ async->mirror_num, async->bio_flags);
+}
+
+static void run_one_async_done(struct btrfs_work *work)
+{
+ struct btrfs_fs_info *fs_info;
+ struct async_submit_bio *async;
+ int limit;
+
+ async = container_of(work, struct async_submit_bio, work);
+ fs_info = BTRFS_I(async->inode)->root->fs_info;
+
+ limit = btrfs_async_submit_limit(fs_info);
+ limit = limit * 2 / 3;
+
+ atomic_dec(&fs_info->nr_async_submits);
+
+ if (atomic_read(&fs_info->nr_async_submits) < limit &&
+ waitqueue_active(&fs_info->async_submit_wait))
+ wake_up(&fs_info->async_submit_wait);
+
+ async->submit_bio_done(async->inode, async->rw, async->bio,
+ async->mirror_num, async->bio_flags);
+}
+
+static void run_one_async_free(struct btrfs_work *work)
+{
+ struct async_submit_bio *async;
+
+ async = container_of(work, struct async_submit_bio, work);
+ kfree(async);
+}
+
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)
+ unsigned long bio_flags,
+ extent_submit_bio_hook_t *submit_bio_start,
+ extent_submit_bio_hook_t *submit_bio_done)
{
struct async_submit_bio *async;
-
- /*
- * inline writerback should stay inline, only hop to the async
- * queue if we're pdflush
- */
- if (!current_is_pdflush())
- return submit_bio_hook(inode, rw, bio, mirror_num);
+ int limit = btrfs_async_submit_limit(fs_info);
async = kmalloc(sizeof(*async), GFP_NOFS);
if (!async)
async->rw = rw;
async->bio = bio;
async->mirror_num = mirror_num;
- async->submit_bio_hook = submit_bio_hook;
+ async->submit_bio_start = submit_bio_start;
+ async->submit_bio_done = submit_bio_done;
+
+ async->work.func = run_one_async_start;
+ async->work.ordered_func = run_one_async_done;
+ async->work.ordered_free = run_one_async_free;
+
+ async->work.flags = 0;
+ async->bio_flags = bio_flags;
+
+ while(atomic_read(&fs_info->async_submit_draining) &&
+ atomic_read(&fs_info->nr_async_submits)) {
+ wait_event(fs_info->async_submit_wait,
+ (atomic_read(&fs_info->nr_async_submits) == 0));
+ }
+
+ atomic_inc(&fs_info->nr_async_submits);
+ btrfs_queue_worker(&fs_info->workers, &async->work);
+
+ if (atomic_read(&fs_info->nr_async_submits) > limit) {
+ wait_event_timeout(fs_info->async_submit_wait,
+ (atomic_read(&fs_info->nr_async_submits) < limit),
+ HZ/10);
- 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);
+ wait_event_timeout(fs_info->async_submit_wait,
+ (atomic_read(&fs_info->nr_async_bios) < limit),
+ HZ/10);
+ }
+
+ while(atomic_read(&fs_info->async_submit_draining) &&
+ atomic_read(&fs_info->nr_async_submits)) {
+ wait_event(fs_info->async_submit_wait,
+ (atomic_read(&fs_info->nr_async_submits) == 0));
+ }
- 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)
+static int btree_csum_one_bio(struct bio *bio)
{
- struct btrfs_root *root = BTRFS_I(inode)->root;
- u64 offset;
- int ret;
-
- offset = bio->bi_sector << 9;
+ struct bio_vec *bvec = bio->bi_io_vec;
+ int bio_index = 0;
+ struct btrfs_root *root;
- if (rw & (1 << BIO_RW)) {
- return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num);
+ WARN_ON(bio->bi_vcnt <= 0);
+ while(bio_index < bio->bi_vcnt) {
+ root = BTRFS_I(bvec->bv_page->mapping->host)->root;
+ csum_dirty_buffer(root, bvec->bv_page);
+ bio_index++;
+ bvec++;
}
+ return 0;
+}
- ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
- BUG_ON(ret);
+static int __btree_submit_bio_start(struct inode *inode, int rw,
+ struct bio *bio, int mirror_num,
+ unsigned long bio_flags)
+{
+ /*
+ * when we're called for a write, we're already in the async
+ * submission context. Just jump into btrfs_map_bio
+ */
+ btree_csum_one_bio(bio);
+ return 0;
+}
- 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_done(struct inode *inode, int rw, struct bio *bio,
+ int mirror_num, unsigned long bio_flags)
+{
+ /*
+ * when we're called for a write, we're already in the async
+ * submission context. Just jump into btrfs_map_bio
+ */
+ return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1);
}
static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
- int mirror_num)
+ int mirror_num, unsigned long bio_flags)
{
+ /*
+ * kthread helpers are used to submit writes so that checksumming
+ * can happen in parallel across all CPUs
+ */
if (!(rw & (1 << BIO_RW))) {
- return __btree_submit_bio_hook(inode, rw, bio, mirror_num);
+ int ret;
+ /*
+ * called for a read, do the setup so that checksum validation
+ * can happen in the async kernel threads
+ */
+ ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info,
+ bio, 1);
+ BUG_ON(ret);
+
+ return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
+ mirror_num, 1);
}
return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info,
- inode, rw, bio, mirror_num,
- __btree_submit_bio_hook);
+ inode, rw, bio, mirror_num, 0,
+ __btree_submit_bio_start,
+ __btree_submit_bio_done);
}
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
struct extent_io_tree *tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
+
+ if (current->flags & PF_MEMALLOC) {
+ redirty_page_for_writepage(wbc, page);
+ unlock_page(page);
+ return 0;
+ }
return extent_write_full_page(tree, page, btree_get_extent, wbc);
}
if (wbc->sync_mode == WB_SYNC_NONE) {
u64 num_dirty;
u64 start = 0;
- unsigned long thresh = 96 * 1024 * 1024;
+ unsigned long thresh = 32 * 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) {
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;
- }
+ if (PageWriteback(page) || PageDirty(page))
+ return 0;
+
tree = &BTRFS_I(page->mapping->host)->io_tree;
map = &BTRFS_I(page->mapping->host)->extent_tree;
+
ret = try_release_extent_state(map, tree, page, gfp_flags);
+ if (!ret) {
+ return 0;
+ }
+
+ ret = try_release_extent_buffer(tree, page);
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;
}
extent_invalidatepage(tree, page, offset);
btree_releasepage(page, GFP_NOFS);
if (PagePrivate(page)) {
- invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE);
+ printk("warning page private not zero on page %Lu\n",
+ page_offset(page));
ClearPagePrivate(page);
set_page_private(page, 0);
page_cache_release(page);
.sync_page = block_sync_page,
};
-int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
+int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
+ u64 parent_transid)
{
struct extent_buffer *buf = NULL;
struct inode *btree_inode = root->fs_info->btree_inode;
return ret;
}
-static int close_all_devices(struct btrfs_fs_info *fs_info)
-{
- struct list_head *list;
- struct list_head *next;
- struct btrfs_device *device;
-
- 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;
- }
- 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)
{
}
+int btrfs_write_tree_block(struct extent_buffer *buf)
+{
+ return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start,
+ buf->start + buf->len - 1, WB_SYNC_ALL);
+}
+
+int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
+{
+ return btrfs_wait_on_page_writeback_range(buf->first_page->mapping,
+ buf->start, buf->start + buf->len -1);
+}
+
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
- u32 blocksize)
+ u32 blocksize, u64 parent_transid)
{
struct extent_buffer *buf = NULL;
struct inode *btree_inode = root->fs_info->btree_inode;
if (!buf)
return NULL;
- ret = btree_read_extent_buffer_pages(root, buf, 0);
+ ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
if (ret == 0) {
buf->flags |= EXTENT_UPTODATE;
+ } else {
+ WARN_ON(1);
}
return buf;
{
struct inode *btree_inode = root->fs_info->btree_inode;
if (btrfs_header_generation(buf) ==
- root->fs_info->running_transaction->transid)
+ root->fs_info->running_transaction->transid) {
+ WARN_ON(!btrfs_tree_locked(buf));
clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
buf);
- return 0;
-}
-
-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;
}
root->node = NULL;
root->inode = NULL;
root->commit_root = NULL;
+ root->ref_tree = NULL;
root->sectorsize = sectorsize;
root->nodesize = nodesize;
root->leafsize = leafsize;
root->in_sysfs = 0;
INIT_LIST_HEAD(&root->dirty_list);
+ INIT_LIST_HEAD(&root->orphan_list);
+ INIT_LIST_HEAD(&root->dead_list);
+ spin_lock_init(&root->node_lock);
+ spin_lock_init(&root->list_lock);
+ mutex_init(&root->objectid_mutex);
+ mutex_init(&root->log_mutex);
+ extent_io_tree_init(&root->dirty_log_pages,
+ fs_info->btree_inode->i_mapping, GFP_NOFS);
+
+ btrfs_leaf_ref_tree_init(&root->ref_tree_struct);
+ root->ref_tree = &root->ref_tree_struct;
+
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));
+ root->defrag_trans_start = fs_info->generation;
init_completion(&root->kobj_unregister);
root->defrag_running = 0;
root->defrag_level = 0;
{
int ret;
u32 blocksize;
+ u64 generation;
__setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
&root->root_item, &root->root_key);
BUG_ON(ret);
+ generation = btrfs_root_generation(&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);
+ blocksize, generation);
BUG_ON(!root->node);
return 0;
}
-struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_fs_info *fs_info,
- struct btrfs_key *location)
+int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
+{
+ struct extent_buffer *eb;
+ struct btrfs_root *log_root_tree = fs_info->log_root_tree;
+ u64 start = 0;
+ u64 end = 0;
+ int ret;
+
+ if (!log_root_tree)
+ return 0;
+
+ while(1) {
+ ret = find_first_extent_bit(&log_root_tree->dirty_log_pages,
+ 0, &start, &end, EXTENT_DIRTY);
+ if (ret)
+ break;
+
+ clear_extent_dirty(&log_root_tree->dirty_log_pages,
+ start, end, GFP_NOFS);
+ }
+ eb = fs_info->log_root_tree->node;
+
+ WARN_ON(btrfs_header_level(eb) != 0);
+ WARN_ON(btrfs_header_nritems(eb) != 0);
+
+ ret = btrfs_free_reserved_extent(fs_info->tree_root,
+ eb->start, eb->len);
+ BUG_ON(ret);
+
+ free_extent_buffer(eb);
+ kfree(fs_info->log_root_tree);
+ fs_info->log_root_tree = NULL;
+ return 0;
+}
+
+int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
{
struct btrfs_root *root;
struct btrfs_root *tree_root = fs_info->tree_root;
+
+ root = kzalloc(sizeof(*root), GFP_NOFS);
+ if (!root)
+ return -ENOMEM;
+
+ __setup_root(tree_root->nodesize, tree_root->leafsize,
+ tree_root->sectorsize, tree_root->stripesize,
+ root, fs_info, BTRFS_TREE_LOG_OBJECTID);
+
+ root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
+ root->root_key.type = BTRFS_ROOT_ITEM_KEY;
+ root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
+ root->ref_cows = 0;
+
+ root->node = btrfs_alloc_free_block(trans, root, root->leafsize,
+ 0, BTRFS_TREE_LOG_OBJECTID,
+ trans->transid, 0, 0, 0);
+
+ btrfs_set_header_nritems(root->node, 0);
+ btrfs_set_header_level(root->node, 0);
+ btrfs_set_header_bytenr(root->node, root->node->start);
+ btrfs_set_header_generation(root->node, trans->transid);
+ btrfs_set_header_owner(root->node, BTRFS_TREE_LOG_OBJECTID);
+
+ write_extent_buffer(root->node, root->fs_info->fsid,
+ (unsigned long)btrfs_header_fsid(root->node),
+ BTRFS_FSID_SIZE);
+ btrfs_mark_buffer_dirty(root->node);
+ btrfs_tree_unlock(root->node);
+ fs_info->log_root_tree = root;
+ return 0;
+}
+
+struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
+ struct btrfs_key *location)
+{
+ struct btrfs_root *root;
+ struct btrfs_fs_info *fs_info = tree_root->fs_info;
struct btrfs_path *path;
struct extent_buffer *l;
u64 highest_inode;
+ u64 generation;
u32 blocksize;
int ret = 0;
kfree(root);
return ERR_PTR(ret);
}
+ generation = btrfs_root_generation(&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);
+ blocksize, generation);
BUG_ON(!root->node);
insert:
- root->ref_cows = 1;
- ret = btrfs_find_highest_inode(root, &highest_inode);
- if (ret == 0) {
- root->highest_inode = highest_inode;
- root->last_inode_alloc = highest_inode;
+ if (location->objectid != BTRFS_TREE_LOG_OBJECTID) {
+ root->ref_cows = 1;
+ ret = btrfs_find_highest_inode(root, &highest_inode);
+ if (ret == 0) {
+ root->highest_inode = highest_inode;
+ root->last_inode_alloc = highest_inode;
+ }
}
return root;
}
return fs_info->tree_root;
if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
return fs_info->extent_root;
+ if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
+ return fs_info->chunk_root;
+ if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
+ return fs_info->dev_root;
root = radix_tree_lookup(&fs_info->fs_roots_radix,
(unsigned long)location->objectid);
if (root)
return root;
- root = btrfs_read_fs_root_no_radix(fs_info, location);
+ root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location);
if (IS_ERR(root))
return root;
ret = radix_tree_insert(&fs_info->fs_roots_radix,
struct btrfs_device *device;
struct backing_dev_info *bdi;
+ if ((bdi_bits & (1 << BDI_write_congested)) &&
+ btrfs_congested_async(info, 0))
+ return 1;
+
list_for_each(cur, &info->fs_devices->devices) {
device = list_entry(cur, struct btrfs_device, dev_list);
+ if (!device->bdev)
+ continue;
bdi = blk_get_backing_dev_info(device->bdev);
if (bdi && bdi_congested(bdi, bdi_bits)) {
ret = 1;
return;
inode = mapping->host;
+
+ /*
+ * don't do the expensive searching for a small number of
+ * devices
+ */
+ if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) {
+ __unplug_io_fn(bdi, page);
+ return;
+ }
+
offset = page_offset(page);
em_tree = &BTRFS_I(inode)->extent_tree;
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE);
spin_unlock(&em_tree->lock);
- if (!em)
+ if (!em) {
+ __unplug_io_fn(bdi, page);
return;
+ }
+ if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
+ free_extent_map(em);
+ __unplug_io_fn(bdi, page);
+ return;
+ }
offset = offset - em->start;
btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
em->block_start + offset, 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;
bdi->state = 0;
bdi->capabilities = default_backing_dev_info.capabilities;
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
+/*
+ * called by the kthread helper functions to finally call the bio end_io
+ * functions. This is where read checksum verification actually happens
+ */
+static void end_workqueue_fn(struct btrfs_work *work)
{
-#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;
+ struct end_io_wq *end_io_wq;
+ struct btrfs_fs_info *fs_info;
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
+ end_io_wq = container_of(work, struct end_io_wq, work);
+ bio = end_io_wq->bio;
+ fs_info = end_io_wq->info;
+
+ /* metadata bios are special because the whole tree block must
+ * be checksummed at once. This makes sure the entire block is in
+ * ram and up to date before trying to verify things. For
+ * blocksize <= pagesize, it is basically a noop
+ */
+ if (end_io_wq->metadata && !bio_ready_for_csum(bio)) {
+ btrfs_queue_worker(&fs_info->endio_workers,
+ &end_io_wq->work);
+ return;
}
+ 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);
+ bio_endio(bio, error);
}
-#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
+static int cleaner_kthread(void *arg)
{
-#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;
+ struct btrfs_root *root = arg;
- 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;
+ do {
+ smp_mb();
+ if (root->fs_info->closing)
+ break;
+
+ vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
+ mutex_lock(&root->fs_info->cleaner_mutex);
+ btrfs_clean_old_snapshots(root);
+ mutex_unlock(&root->fs_info->cleaner_mutex);
+
+ if (freezing(current)) {
+ refrigerator();
+ } else {
+ smp_mb();
+ if (root->fs_info->closing)
+ break;
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ __set_current_state(TASK_RUNNING);
}
- next = fs_info->async_submit_work_list.next;
- list_del(next);
- spin_unlock(&fs_info->async_submit_work_lock);
+ } while (!kthread_should_stop());
+ return 0;
+}
- async = list_entry(next, struct async_submit_bio, list);
- async->submit_bio_hook(async->inode, async->rw, async->bio,
- async->mirror_num);
- kfree(async);
- }
+static int transaction_kthread(void *arg)
+{
+ struct btrfs_root *root = arg;
+ struct btrfs_trans_handle *trans;
+ struct btrfs_transaction *cur;
+ unsigned long now;
+ unsigned long delay;
+ int ret;
+
+ do {
+ smp_mb();
+ if (root->fs_info->closing)
+ break;
+
+ delay = HZ * 30;
+ vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE);
+ mutex_lock(&root->fs_info->transaction_kthread_mutex);
+
+ if (root->fs_info->total_ref_cache_size > 20 * 1024 * 1024) {
+ printk("btrfs: total reference cache size %Lu\n",
+ root->fs_info->total_ref_cache_size);
+ }
+
+ mutex_lock(&root->fs_info->trans_mutex);
+ cur = root->fs_info->running_transaction;
+ if (!cur) {
+ mutex_unlock(&root->fs_info->trans_mutex);
+ goto sleep;
+ }
+
+ now = get_seconds();
+ if (now < cur->start_time || now - cur->start_time < 30) {
+ mutex_unlock(&root->fs_info->trans_mutex);
+ delay = HZ * 5;
+ goto sleep;
+ }
+ mutex_unlock(&root->fs_info->trans_mutex);
+ trans = btrfs_start_transaction(root, 1);
+ ret = btrfs_commit_transaction(trans, root);
+sleep:
+ wake_up_process(root->fs_info->cleaner_kthread);
+ mutex_unlock(&root->fs_info->transaction_kthread_mutex);
+
+ if (freezing(current)) {
+ refrigerator();
+ } else {
+ if (root->fs_info->closing)
+ break;
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule_timeout(delay);
+ __set_current_state(TASK_RUNNING);
+ }
+ } while (!kthread_should_stop());
+ return 0;
}
struct btrfs_root *open_ctree(struct super_block *sb,
- struct btrfs_fs_devices *fs_devices)
+ struct btrfs_fs_devices *fs_devices,
+ char *options)
{
u32 sectorsize;
u32 nodesize;
u32 leafsize;
u32 blocksize;
u32 stripesize;
- struct btrfs_root *extent_root = kmalloc(sizeof(struct btrfs_root),
+ u64 generation;
+ struct buffer_head *bh;
+ struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
- struct btrfs_root *tree_root = kmalloc(sizeof(struct btrfs_root),
+ struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info),
GFP_NOFS);
- struct btrfs_root *chunk_root = kmalloc(sizeof(struct btrfs_root),
+ struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
- struct btrfs_root *dev_root = kmalloc(sizeof(struct btrfs_root),
+ struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
GFP_NOFS);
+ struct btrfs_root *log_tree_root;
+
int ret;
int err = -EINVAL;
+
struct btrfs_super_block *disk_super;
- if (!extent_root || !tree_root || !fs_info) {
+ if (!extent_root || !tree_root || !fs_info ||
+ !chunk_root || !dev_root) {
err = -ENOMEM;
goto fail;
}
- 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_LIST_HEAD(&fs_info->trans_list);
INIT_LIST_HEAD(&fs_info->dead_roots);
INIT_LIST_HEAD(&fs_info->hashers);
- INIT_LIST_HEAD(&fs_info->end_io_work_list);
- INIT_LIST_HEAD(&fs_info->async_submit_work_list);
+ INIT_LIST_HEAD(&fs_info->delalloc_inodes);
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);
+ spin_lock_init(&fs_info->ref_cache_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;
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
INIT_LIST_HEAD(&fs_info->space_info);
btrfs_mapping_init(&fs_info->mapping_tree);
+ atomic_set(&fs_info->nr_async_submits, 0);
+ atomic_set(&fs_info->async_delalloc_pages, 0);
+ atomic_set(&fs_info->async_submit_draining, 0);
+ atomic_set(&fs_info->nr_async_bios, 0);
+ atomic_set(&fs_info->throttles, 0);
+ atomic_set(&fs_info->throttle_gen, 0);
fs_info->sb = sb;
fs_info->max_extent = (u64)-1;
fs_info->max_inline = 8192 * 1024;
fs_info->btree_inode->i_ino = 1;
fs_info->btree_inode->i_nlink = 1;
+ fs_info->thread_pool_size = min(num_online_cpus() + 2, 8);
+
+ INIT_LIST_HEAD(&fs_info->ordered_extents);
+ spin_lock_init(&fs_info->ordered_extent_lock);
+
+ sb->s_blocksize = 4096;
+ sb->s_blocksize_bits = blksize_bits(4096);
+
/*
* we set the i_size on the btree inode to the max possible int.
* the real end of the address space is determined by all of
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);
+ spin_lock_init(&fs_info->block_group_cache_lock);
+ fs_info->block_group_cache_tree.rb_node = NULL;
+
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);
fs_info->do_barriers = 1;
-#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
+ INIT_LIST_HEAD(&fs_info->dead_reloc_roots);
+ btrfs_leaf_ref_tree_init(&fs_info->reloc_ref_tree);
+ btrfs_leaf_ref_tree_init(&fs_info->shared_ref_tree);
+
BTRFS_I(fs_info->btree_inode)->root = tree_root;
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
sizeof(struct btrfs_key));
insert_inode_hash(fs_info->btree_inode);
- mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS);
mutex_init(&fs_info->trans_mutex);
- mutex_init(&fs_info->fs_mutex);
+ mutex_init(&fs_info->tree_log_mutex);
+ mutex_init(&fs_info->drop_mutex);
+ mutex_init(&fs_info->extent_ins_mutex);
+ mutex_init(&fs_info->pinned_mutex);
+ mutex_init(&fs_info->chunk_mutex);
+ mutex_init(&fs_info->transaction_kthread_mutex);
+ mutex_init(&fs_info->cleaner_mutex);
+ mutex_init(&fs_info->volume_mutex);
+ mutex_init(&fs_info->tree_reloc_mutex);
+ init_waitqueue_head(&fs_info->transaction_throttle);
+ init_waitqueue_head(&fs_info->transaction_wait);
+ init_waitqueue_head(&fs_info->async_submit_wait);
+ init_waitqueue_head(&fs_info->tree_log_wait);
+ atomic_set(&fs_info->tree_log_commit, 0);
+ atomic_set(&fs_info->tree_log_writers, 0);
+ fs_info->tree_log_transid = 0;
#if 0
ret = add_hasher(fs_info, "crc32c");
__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,
- 4096);
- if (!fs_info->sb_buffer)
+ bh = __bread(fs_devices->latest_bdev,
+ BTRFS_SUPER_INFO_OFFSET / 4096, 4096);
+ if (!bh)
goto fail_iput;
- read_extent_buffer(fs_info->sb_buffer, &fs_info->super_copy, 0,
- sizeof(fs_info->super_copy));
+ memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy));
+ brelse(bh);
- read_extent_buffer(fs_info->sb_buffer, fs_info->fsid,
- (unsigned long)btrfs_super_fsid(fs_info->sb_buffer),
- BTRFS_FSID_SIZE);
+ memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
disk_super = &fs_info->super_copy;
if (!btrfs_super_root(disk_super))
goto fail_sb_buffer;
- if (btrfs_super_num_devices(disk_super) != fs_devices->num_devices) {
+ err = btrfs_parse_options(tree_root, options);
+ if (err)
+ goto fail_sb_buffer;
+
+ /*
+ * we need to start all the end_io workers up front because the
+ * queue work function gets called at interrupt time, and so it
+ * cannot dynamically grow.
+ */
+ btrfs_init_workers(&fs_info->workers, "worker",
+ fs_info->thread_pool_size);
+
+ btrfs_init_workers(&fs_info->delalloc_workers, "delalloc",
+ fs_info->thread_pool_size);
+
+ btrfs_init_workers(&fs_info->submit_workers, "submit",
+ min_t(u64, fs_devices->num_devices,
+ fs_info->thread_pool_size));
+
+ /* a higher idle thresh on the submit workers makes it much more
+ * likely that bios will be send down in a sane order to the
+ * devices
+ */
+ fs_info->submit_workers.idle_thresh = 64;
+
+ fs_info->workers.idle_thresh = 16;
+ fs_info->workers.ordered = 1;
+
+ fs_info->delalloc_workers.idle_thresh = 2;
+ fs_info->delalloc_workers.ordered = 1;
+
+ btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1);
+ btrfs_init_workers(&fs_info->endio_workers, "endio",
+ fs_info->thread_pool_size);
+ btrfs_init_workers(&fs_info->endio_write_workers, "endio-write",
+ fs_info->thread_pool_size);
+
+ /*
+ * endios are largely parallel and should have a very
+ * low idle thresh
+ */
+ fs_info->endio_workers.idle_thresh = 4;
+ fs_info->endio_write_workers.idle_thresh = 64;
+
+ btrfs_start_workers(&fs_info->workers, 1);
+ btrfs_start_workers(&fs_info->submit_workers, 1);
+ btrfs_start_workers(&fs_info->delalloc_workers, 1);
+ btrfs_start_workers(&fs_info->fixup_workers, 1);
+ btrfs_start_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
+ btrfs_start_workers(&fs_info->endio_write_workers,
+ fs_info->thread_pool_size);
+
+ err = -EINVAL;
+ if (btrfs_super_num_devices(disk_super) > fs_devices->open_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;
+ (unsigned long long)fs_devices->open_devices);
+ if (btrfs_test_opt(tree_root, DEGRADED))
+ printk("continuing in degraded mode\n");
+ else {
+ goto fail_sb_buffer;
+ }
}
+
fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super);
+ fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages,
+ 4 * 1024 * 1024 / PAGE_CACHE_SIZE);
nodesize = btrfs_super_nodesize(disk_super);
leafsize = btrfs_super_leafsize(disk_super);
tree_root->leafsize = leafsize;
tree_root->sectorsize = sectorsize;
tree_root->stripesize = stripesize;
- sb_set_blocksize(sb, sectorsize);
+
+ sb->s_blocksize = sectorsize;
+ sb->s_blocksize_bits = blksize_bits(sectorsize);
if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC,
sizeof(disk_super->magic))) {
goto fail_sb_buffer;
}
- mutex_lock(&fs_info->fs_mutex);
-
+ mutex_lock(&fs_info->chunk_mutex);
ret = btrfs_read_sys_array(tree_root);
+ mutex_unlock(&fs_info->chunk_mutex);
if (ret) {
printk("btrfs: failed to read the system array on %s\n",
sb->s_id);
blocksize = btrfs_level_size(tree_root,
btrfs_super_chunk_root_level(disk_super));
+ generation = btrfs_super_chunk_root_generation(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);
+ blocksize, generation);
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);
+ mutex_lock(&fs_info->chunk_mutex);
ret = btrfs_read_chunk_tree(chunk_root);
+ mutex_unlock(&fs_info->chunk_mutex);
BUG_ON(ret);
+ btrfs_close_extra_devices(fs_devices);
+
blocksize = btrfs_level_size(tree_root,
btrfs_super_root_level(disk_super));
-
+ generation = btrfs_super_generation(disk_super);
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super),
- blocksize);
+ blocksize, generation);
if (!tree_root->node)
goto fail_sb_buffer;
fs_info->data_alloc_profile = (u64)-1;
fs_info->metadata_alloc_profile = (u64)-1;
fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
+ fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root,
+ "btrfs-cleaner");
+ if (!fs_info->cleaner_kthread)
+ goto fail_extent_root;
+
+ fs_info->transaction_kthread = kthread_run(transaction_kthread,
+ tree_root,
+ "btrfs-transaction");
+ if (!fs_info->transaction_kthread)
+ goto fail_cleaner;
+
+ if (btrfs_super_log_root(disk_super) != 0) {
+ u32 blocksize;
+ u64 bytenr = btrfs_super_log_root(disk_super);
+
+ blocksize =
+ btrfs_level_size(tree_root,
+ btrfs_super_log_root_level(disk_super));
+
+ log_tree_root = kzalloc(sizeof(struct btrfs_root),
+ GFP_NOFS);
+
+ __setup_root(nodesize, leafsize, sectorsize, stripesize,
+ log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
+
+ log_tree_root->node = read_tree_block(tree_root, bytenr,
+ blocksize,
+ generation + 1);
+ ret = btrfs_recover_log_trees(log_tree_root);
+ BUG_ON(ret);
+ }
+ fs_info->last_trans_committed = btrfs_super_generation(disk_super);
+
+ ret = btrfs_cleanup_reloc_trees(tree_root);
+ BUG_ON(ret);
- mutex_unlock(&fs_info->fs_mutex);
return tree_root;
+fail_cleaner:
+ kthread_stop(fs_info->cleaner_kthread);
fail_extent_root:
free_extent_buffer(extent_root->node);
fail_tree_root:
free_extent_buffer(tree_root->node);
fail_sys_array:
- mutex_unlock(&fs_info->fs_mutex);
fail_sb_buffer:
- free_extent_buffer(fs_info->sb_buffer);
- extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
+ btrfs_stop_workers(&fs_info->fixup_workers);
+ btrfs_stop_workers(&fs_info->delalloc_workers);
+ btrfs_stop_workers(&fs_info->workers);
+ btrfs_stop_workers(&fs_info->endio_workers);
+ btrfs_stop_workers(&fs_info->endio_write_workers);
+ btrfs_stop_workers(&fs_info->submit_workers);
fail_iput:
iput(fs_info->btree_inode);
fail:
- close_all_devices(fs_info);
+ btrfs_close_devices(fs_info->fs_devices);
btrfs_mapping_tree_free(&fs_info->mapping_tree);
kfree(extent_root);
kfree(tree_root);
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,23)
bdi_destroy(&fs_info->bdi);
-#endif
kfree(fs_info);
+ kfree(chunk_root);
+ kfree(dev_root);
return ERR_PTR(err);
}
"I/O error on %s\n",
bdevname(bh->b_bdev, b));
}
- set_buffer_write_io_error(bh);
+ /* note, we dont' set_buffer_write_io_error because we have
+ * our own ways of dealing with the IO errors
+ */
clear_buffer_uptodate(bh);
}
unlock_buffer(bh);
struct list_head *cur;
struct list_head *head = &root->fs_info->fs_devices->devices;
struct btrfs_device *dev;
- struct extent_buffer *sb;
+ struct btrfs_super_block *sb;
struct btrfs_dev_item *dev_item;
struct buffer_head *bh;
int ret;
int do_barriers;
+ int max_errors;
+ int total_errors = 0;
+ u32 crc;
+ u64 flags;
+ max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1;
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);
+ sb = &root->fs_info->super_for_commit;
+ dev_item = &sb->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,
+ if (!dev->bdev) {
+ total_errors++;
+ continue;
+ }
+ if (!dev->in_fs_metadata)
+ continue;
+
+ btrfs_set_stack_device_type(dev_item, dev->type);
+ btrfs_set_stack_device_id(dev_item, dev->devid);
+ btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
+ btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
+ btrfs_set_stack_device_io_align(dev_item, dev->io_align);
+ btrfs_set_stack_device_io_width(dev_item, dev->io_width);
+ btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
+ memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
+ flags = btrfs_super_flags(sb);
+ btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
+
+
+ crc = ~(u32)0;
+ crc = btrfs_csum_data(root, (char *)sb + BTRFS_CSUM_SIZE, crc,
+ BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
+ btrfs_csum_final(crc, sb->csum);
+
+ bh = __getblk(dev->bdev, BTRFS_SUPER_INFO_OFFSET / 4096,
BTRFS_SUPER_INFO_SIZE);
- read_extent_buffer(sb, bh->b_data, 0, BTRFS_SUPER_INFO_SIZE);
+ memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
dev->pending_io = bh;
get_bh(bh);
} else {
ret = submit_bh(WRITE, bh);
}
- BUG_ON(ret);
+ if (ret)
+ total_errors++;
+ }
+ if (total_errors > max_errors) {
+ printk("btrfs: %d errors while writing supers\n", total_errors);
+ BUG();
}
+ total_errors = 0;
list_for_each(cur, head) {
dev = list_entry(cur, struct btrfs_device, dev_list);
+ if (!dev->bdev)
+ continue;
+ if (!dev->in_fs_metadata)
+ continue;
+
BUG_ON(!dev->pending_io);
bh = dev->pending_io;
wait_on_buffer(bh);
ret = submit_bh(WRITE, bh);
BUG_ON(ret);
wait_on_buffer(bh);
- BUG_ON(!buffer_uptodate(bh));
+ if (!buffer_uptodate(bh))
+ total_errors++;
} else {
- BUG();
+ total_errors++;
}
}
dev->pending_io = NULL;
brelse(bh);
}
+ if (total_errors > max_errors) {
+ printk("btrfs: %d errors while writing supers\n", total_errors);
+ BUG();
+ }
return 0;
}
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;
}
struct btrfs_fs_info *fs_info = root->fs_info;
fs_info->closing = 1;
- btrfs_transaction_flush_work(root);
- mutex_lock(&fs_info->fs_mutex);
- btrfs_defrag_dirty_roots(root->fs_info);
+ smp_mb();
+
+ kthread_stop(root->fs_info->transaction_kthread);
+ kthread_stop(root->fs_info->cleaner_kthread);
+
+ btrfs_clean_old_snapshots(root);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
/* run commit again to drop the original snapshot */
btrfs_commit_transaction(trans, root);
ret = btrfs_write_and_wait_transaction(NULL, root);
BUG_ON(ret);
- write_ctree_super(NULL, root);
- mutex_unlock(&fs_info->fs_mutex);
- btrfs_transaction_flush_work(root);
+ write_ctree_super(NULL, root);
if (fs_info->delalloc_bytes) {
printk("btrfs: at unmount delalloc count %Lu\n",
fs_info->delalloc_bytes);
}
+ if (fs_info->total_ref_cache_size) {
+ printk("btrfs: at umount reference cache size %Lu\n",
+ fs_info->total_ref_cache_size);
+ }
+
if (fs_info->extent_root->node)
free_extent_buffer(fs_info->extent_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);
+ fs_info->closing = 2;
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);
-
- flush_workqueue(end_io_workqueue);
- flush_workqueue(async_submit_workqueue);
-
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);
+ btrfs_stop_workers(&fs_info->fixup_workers);
+ btrfs_stop_workers(&fs_info->delalloc_workers);
+ btrfs_stop_workers(&fs_info->workers);
+ btrfs_stop_workers(&fs_info->endio_workers);
+ btrfs_stop_workers(&fs_info->endio_write_workers);
+ btrfs_stop_workers(&fs_info->submit_workers);
iput(fs_info->btree_inode);
#if 0
kfree(hasher);
}
#endif
- close_all_devices(fs_info);
+ btrfs_close_devices(fs_info->fs_devices);
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);
return 0;
}
-int btrfs_buffer_uptodate(struct extent_buffer *buf)
+int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
{
+ int ret;
struct inode *btree_inode = buf->first_page->mapping->host;
- return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
+
+ ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
+ if (!ret)
+ return ret;
+
+ ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf,
+ parent_transid);
+ return !ret;
}
int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
u64 transid = btrfs_header_generation(buf);
struct inode *btree_inode = root->fs_info->btree_inode;
+ WARN_ON(!btrfs_tree_locked(buf));
if (transid != root->fs_info->generation) {
printk(KERN_CRIT "transid mismatch buffer %llu, found %Lu running %Lu\n",
(unsigned long long)buf->start,
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);
-}
+ /*
+ * looks as though older kernels can get into trouble with
+ * this code, they end up stuck in balance_dirty_pages forever
+ */
+ struct extent_io_tree *tree;
+ u64 num_dirty;
+ u64 start = 0;
+ unsigned long thresh = 32 * 1024 * 1024;
+ tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
-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);
-}
+ if (current_is_pdflush() || current->flags & PF_MEMALLOC)
+ return;
-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);
+ num_dirty = count_range_bits(tree, &start, (u64)-1,
+ thresh, EXTENT_DIRTY);
+ if (num_dirty > thresh) {
+ balance_dirty_pages_ratelimited_nr(
+ root->fs_info->btree_inode->i_mapping, 1);
+ }
+ return;
}
-int btrfs_buffer_defrag(struct extent_buffer *buf)
+int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid)
{
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 ret;
+ ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
+ if (ret == 0) {
+ buf->flags |= EXTENT_UPTODATE;
+ }
+ return ret;
}
-int btrfs_buffer_defrag_done(struct extent_buffer *buf)
+int btree_lock_page_hook(struct page *page)
{
- 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);
-}
+ struct inode *inode = page->mapping->host;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
+ struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
+ struct extent_buffer *eb;
+ unsigned long len;
+ u64 bytenr = page_offset(page);
-int btrfs_clear_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 clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG_DONE, GFP_NOFS);
-}
+ if (page->private == EXTENT_PAGE_PRIVATE)
+ goto out;
-int btrfs_clear_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 clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG, GFP_NOFS);
-}
+ len = page->private >> 2;
+ eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS);
+ if (!eb)
+ goto out;
-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;
+ btrfs_tree_lock(eb);
+ spin_lock(&root->fs_info->hash_lock);
+ btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
+ spin_unlock(&root->fs_info->hash_lock);
+ btrfs_tree_unlock(eb);
+ free_extent_buffer(eb);
+out:
+ lock_page(page);
+ return 0;
}
static struct extent_io_ops btree_extent_io_ops = {
- .writepage_io_hook = btree_writepage_io_hook,
+ .write_cache_pages_lock_hook = btree_lock_page_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 */
projects / linux-2.6-block.git / blobdiff