* Boston, MA 021110-1307, USA.
*/
+#include <linux/version.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 <linux/kthread.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)
+# include <linux/freezer.h>
+#else
+# include <linux/sched.h>
+#endif
+#include "crc32c.h"
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
#include "btrfs_inode.h"
+#include "volumes.h"
#include "print-tree.h"
+#include "async-thread.h"
+#include "locking.h"
#if 0
static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
}
#endif
-static struct extent_map_ops btree_extent_map_ops;
-
-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)->extent_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;
+static struct extent_io_ops btree_extent_io_ops;
+static void end_workqueue_fn(struct btrfs_work *work);
+
+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 btrfs_work work;
+};
- eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
- bytenr, blocksize, NULL, GFP_NOFS);
- return eb;
-}
+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 btrfs_work work;
+};
struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
- size_t page_offset, u64 start, u64 end,
+ size_t page_offset, u64 start, u64 len,
int create)
{
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_map *em;
int ret;
-again:
- em = lookup_extent_mapping(em_tree, start, end);
+ spin_lock(&em_tree->lock);
+ em = lookup_extent_mapping(em_tree, start, len);
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 = ERR_PTR(-ENOMEM);
goto out;
}
em->start = 0;
- em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1;
+ em->len = (u64)-1;
em->block_start = 0;
- em->block_end = em->end;
- 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);
if (ret == -EEXIST) {
+ u64 failed_start = em->start;
+ u64 failed_len = em->len;
+
+ printk("failed to insert %Lu %Lu -> %Lu into tree\n",
+ em->start, em->len, em->block_start);
free_extent_map(em);
- em = NULL;
- goto again;
+ em = lookup_extent_mapping(em_tree, start, len);
+ if (em) {
+ printk("after failing, found %Lu %Lu %Lu\n",
+ em->start, em->len, em->block_start);
+ ret = 0;
+ } else {
+ em = lookup_extent_mapping(em_tree, failed_start,
+ failed_len);
+ if (em) {
+ printk("double failure lookup gives us "
+ "%Lu %Lu -> %Lu\n", em->start,
+ em->len, em->block_start);
+ free_extent_map(em);
+ }
+ ret = -EIO;
+ }
} else if (ret) {
- em = ERR_PTR(ret);
+ free_extent_map(em);
+ em = NULL;
}
+ spin_unlock(&em_tree->lock);
+
+ if (ret)
+ em = ERR_PTR(ret);
out:
return em;
}
u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
{
- return crc32c(seed, data, len);
+ return btrfs_crc32c(seed, data, len);
}
void btrfs_csum_final(u32 crc, char *result)
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)) {
- printk("btrfs: %s checksum verify failed on %llu\n",
+ 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);
+ buf->start, val, found, from_this_trans,
+ btrfs_header_level(buf));
return 1;
}
} else {
return 0;
}
+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;
+out:
+ clear_extent_buffer_uptodate(io_tree, eb);
+ unlock_extent(io_tree, eb->start, eb->start + eb->len - 1,
+ GFP_NOFS);
+ return ret;
+
+}
+
+static int btree_read_extent_buffer_pages(struct btrfs_root *root,
+ struct extent_buffer *eb,
+ u64 start, u64 parent_transid)
+{
+ struct extent_io_tree *io_tree;
+ int ret;
+ int num_copies = 0;
+ int mirror_num = 0;
+
+ io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
+ while (1) {
+ ret = read_extent_buffer_pages(io_tree, eb, start, 1,
+ btree_get_extent, mirror_num);
+ if (!ret &&
+ !verify_parent_transid(io_tree, eb, parent_transid))
+ return ret;
+
+ num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
+ eb->start, eb->len);
+ if (num_copies == 1)
+ return ret;
+
+ mirror_num++;
+ if (mirror_num > num_copies)
+ return ret;
+ }
+ return -EIO;
+}
int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
{
- struct extent_map_tree *tree;
+ 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;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ int ret;
+
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
if (page->private == EXTENT_PAGE_PRIVATE)
goto out;
WARN_ON(1);
}
eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS);
- read_extent_buffer_pages(tree, eb, start + PAGE_CACHE_SIZE, 1);
+ ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE,
+ btrfs_header_generation(eb));
+ BUG_ON(ret);
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;
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);
+
+ found_start = btrfs_header_bytenr(eb);
+ if (found_start != 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;
+ }
+ 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);
+ if (ret)
+ ret = -EIO;
+
+ end = min_t(u64, eb->len, PAGE_CACHE_SIZE);
+ end = eb->start + end - 1;
+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;
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ if (bio->bi_size)
+ return 1;
+#endif
+
+ fs_info = end_io_wq->info;
+ end_io_wq->error = err;
+ 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);
+
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ return 0;
+#endif
+}
+
+int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio,
+ int metadata)
+{
+ 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 void run_one_async_submit(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;
+ atomic_dec(&fs_info->nr_async_submits);
+ async->submit_bio_hook(async->inode, async->rw, async->bio,
+ async->mirror_num);
+ 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)
+{
+ 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;
+ async->work.func = run_one_async_submit;
+ async->work.flags = 0;
+ atomic_inc(&fs_info->nr_async_submits);
+ btrfs_queue_worker(&fs_info->workers, &async->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;
+
+ offset = bio->bi_sector << 9;
+
+ /*
+ * when we're called for a write, we're already in the async
+ * submission context. Just jump ingo btrfs_map_bio
+ */
+ if (rw & (1 << BIO_RW)) {
+ return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio,
+ mirror_num, 0);
+ }
+
+ /*
+ * called for a read, do the setup so that checksum validation
+ * can happen in the async kernel threads
+ */
+ ret = btrfs_bio_wq_end_io(root->fs_info, bio, 1);
+ BUG_ON(ret);
+
+ 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)
+{
+ /*
+ * 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);
+ }
+ 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_map_tree *tree;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ 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_map_tree *tree;
- tree = &BTRFS_I(mapping->host)->extent_tree;
+ 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;
} else {
thresh = 8 * 1024 * 1024;
}
- num_dirty = count_range_bits(tree, &start, thresh, EXTENT_DIRTY);
+ num_dirty = count_range_bits(tree, &start, (u64)-1,
+ thresh, EXTENT_DIRTY);
if (num_dirty < thresh) {
return 0;
}
int btree_readpage(struct file *file, struct page *page)
{
- struct extent_map_tree *tree;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ 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 unused_gfp_flags)
+static int btree_releasepage(struct page *page, gfp_t gfp_flags)
{
- struct extent_map_tree *tree;
+ struct extent_io_tree *tree;
+ struct extent_map_tree *map;
int ret;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
- ret = try_release_extent_mapping(tree, page);
+ 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) {
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_map_tree *tree;
- tree = &BTRFS_I(page->mapping->host)->extent_tree;
+ struct extent_io_tree *tree;
+ tree = &BTRFS_I(page->mapping->host)->io_tree;
extent_invalidatepage(tree, page, offset);
btree_releasepage(page, GFP_NOFS);
+ if (PagePrivate(page)) {
+ printk("warning page private not zero on page %Lu\n",
+ page_offset(page));
+ ClearPagePrivate(page);
+ set_page_private(page, 0);
+ page_cache_release(page);
+ }
}
#if 0
.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;
buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
if (!buf)
return 0;
- read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
- buf, 0, 0);
+ read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
+ buf, 0, 0, btree_get_extent, 0);
free_extent_buffer(buf);
return ret;
}
+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)
+ u32 blocksize, u64 parent_transid)
{
struct extent_buffer *buf = NULL;
struct inode *btree_inode = root->fs_info->btree_inode;
- struct extent_map_tree *extent_tree;
+ struct extent_io_tree *io_tree;
int ret;
- extent_tree = &BTRFS_I(btree_inode)->extent_tree;
+ io_tree = &BTRFS_I(btree_inode)->io_tree;
buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
if (!buf)
return NULL;
- read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
- buf, 0, 1);
- if (buf->flags & EXTENT_CSUM) {
- return buf;
- }
- if (test_range_bit(extent_tree, buf->start, buf->start + buf->len - 1,
- EXTENT_CSUM, 1)) {
- buf->flags |= EXTENT_CSUM;
- return buf;
- }
- ret = csum_tree_block(root, buf, 1);
- set_extent_bits(extent_tree, buf->start,
- buf->start + buf->len - 1,
- EXTENT_CSUM, GFP_NOFS);
- buf->flags |= EXTENT_CSUM;
+
+ ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
+
+ if (ret == 0) {
+ buf->flags |= EXTENT_UPTODATE;
+ }
return buf;
+
}
int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct extent_buffer *buf)
{
struct inode *btree_inode = root->fs_info->btree_inode;
- clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
+ if (btrfs_header_generation(buf) ==
+ 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;
}
struct extent_buffer *buf)
{
struct inode *btree_inode = root->fs_info->btree_inode;
- wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
+ wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
buf);
return 0;
}
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);
+ spin_lock_init(&root->node_lock);
+ mutex_init(&root->objectid_mutex);
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);
- init_rwsem(&root->snap_sem);
root->defrag_running = 0;
root->defrag_level = 0;
root->root_key.objectid = objectid;
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, 0);
BUG_ON(!root->node);
return 0;
}
}
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, 0);
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,
- const char *name, int namelen)
+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;
+ 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)
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 *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) {
kfree(root);
return ERR_PTR(ret);
}
-
- ret = btrfs_find_dead_roots(fs_info->tree_root,
- root->root_key.objectid, root);
- BUG_ON(ret);
-
+ root->in_sysfs = 1;
return root;
}
#if 0
return 0;
}
#endif
-struct btrfs_root *open_ctree(struct super_block *sb)
+
+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;
+ int limit = 256 * info->fs_devices->open_devices;
+ struct list_head *cur;
+ struct btrfs_device *device;
+ struct backing_dev_info *bdi;
+
+ if ((bdi_bits & (1 << BDI_write_congested)) &&
+ atomic_read(&info->nr_async_submits) > limit) {
+ 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;
+ break;
+ }
+ }
+ return ret;
+}
+
+/*
+ * this unplugs every device on the box, and it is only used when page
+ * is null
+ */
+static void __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);
+ }
+ }
+}
+
+void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
+{
+ struct inode *inode;
+ struct extent_map_tree *em_tree;
+ struct extent_map *em;
+ struct address_space *mapping;
+ u64 offset;
+
+ /* the generic O_DIRECT read code does this */
+ if (!page) {
+ __unplug_io_fn(bdi, page);
+ return;
+ }
+
+ /*
+ * page->mapping may change at any time. Get a consistent copy
+ * and use that for everything below
+ */
+ smp_mb();
+ mapping = page->mapping;
+ if (!mapping)
+ return;
+
+ inode = mapping->host;
+ 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)
+ return;
+
+ offset = offset - em->start;
+ btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree,
+ em->block_start + offset, page);
+ free_extent_map(em);
+}
+
+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;
+ 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;
+}
+
+/*
+ * 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)
+{
+ struct bio *bio;
+ struct end_io_wq *end_io_wq;
+ struct btrfs_fs_info *fs_info;
+ int error;
+
+ 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);
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
+ bio_endio(bio, bio->bi_size, error);
+#else
+ bio_endio(bio, error);
+#endif
+}
+
+static int cleaner_kthread(void *arg)
+{
+ struct btrfs_root *root = arg;
+
+ 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);
+ }
+ } while (!kthread_should_stop());
+ return 0;
+}
+
+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);
+
+ 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,
+ char *options)
{
u32 sectorsize;
u32 nodesize;
u32 leafsize;
u32 blocksize;
u32 stripesize;
+ struct buffer_head *bh;
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) {
INIT_LIST_HEAD(&fs_info->dead_roots);
INIT_LIST_HEAD(&fs_info->hashers);
spin_lock_init(&fs_info->hash_lock);
+ spin_lock_init(&fs_info->delalloc_lock);
+ spin_lock_init(&fs_info->new_trans_lock);
- memset(&fs_info->super_kobj, 0, sizeof(fs_info->super_kobj));
init_completion(&fs_info->kobj_unregister);
- sb_set_blocksize(sb, 4096);
- fs_info->running_transaction = NULL;
- fs_info->last_trans_committed = 0;
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);
+ atomic_set(&fs_info->nr_async_submits, 0);
+ atomic_set(&fs_info->throttles, 0);
fs_info->sb = sb;
- fs_info->mount_opt = 0;
+ 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->thread_pool_size = min(num_online_cpus() + 2, 8);
+
+ 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
+ * the devices in the system
+ */
+ fs_info->btree_inode->i_size = OFFSET_MAX;
fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
- extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
+ 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);
- BTRFS_I(fs_info->btree_inode)->extent_tree.ops = &btree_extent_map_ops;
+ 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_map_tree_init(&fs_info->free_space_cache,
+ extent_io_tree_init(&fs_info->free_space_cache,
fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->block_group_cache,
+ extent_io_tree_init(&fs_info->block_group_cache,
fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->pinned_extents,
+ extent_io_tree_init(&fs_info->pinned_extents,
fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->pending_del,
+ extent_io_tree_init(&fs_info->pending_del,
fs_info->btree_inode->i_mapping, GFP_NOFS);
- extent_map_tree_init(&fs_info->extent_ins,
+ extent_io_tree_init(&fs_info->extent_ins,
fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->do_barriers = 1;
- fs_info->closing = 0;
- fs_info->total_pinned = 0;
- INIT_DELAYED_WORK(&fs_info->trans_work, btrfs_transaction_cleaner);
BTRFS_I(fs_info->btree_inode)->root = tree_root;
memset(&BTRFS_I(fs_info->btree_inode)->location, 0,
sizeof(struct btrfs_key));
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->drop_mutex);
+ mutex_init(&fs_info->alloc_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);
+ init_waitqueue_head(&fs_info->transaction_throttle);
+ init_waitqueue_head(&fs_info->transaction_wait);
#if 0
ret = add_hasher(fs_info, "crc32c");
goto fail_iput;
}
#endif
- __setup_root(512, 512, 512, 512, tree_root,
+ __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,
- 512);
- 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);
+
+ memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE);
- 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;
+ 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, fs_info->thread_pool_size);
+ btrfs_init_workers(&fs_info->submit_workers, fs_info->thread_pool_size);
+ btrfs_init_workers(&fs_info->fixup_workers, 1);
+ btrfs_init_workers(&fs_info->endio_workers, fs_info->thread_pool_size);
+ btrfs_init_workers(&fs_info->endio_write_workers,
+ fs_info->thread_pool_size);
+ btrfs_start_workers(&fs_info->workers, 1);
+ btrfs_start_workers(&fs_info->submit_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->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);
+
nodesize = btrfs_super_nodesize(disk_super);
leafsize = btrfs_super_leafsize(disk_super);
sectorsize = btrfs_super_sectorsize(disk_super);
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));
+ 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->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);
+ goto fail_sys_array;
+ }
+
+ 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, 0);
+ 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));
+
tree_root->node = read_tree_block(tree_root,
btrfs_super_root(disk_super),
- blocksize);
+ blocksize, 0);
if (!tree_root->node)
goto fail_sb_buffer;
- mutex_lock(&fs_info->fs_mutex);
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;
- mutex_unlock(&fs_info->fs_mutex);
+ 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;
+
+
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:
fail_sb_buffer:
- free_extent_buffer(fs_info->sb_buffer);
+ btrfs_stop_workers(&fs_info->fixup_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:
+ 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);
return ERR_PTR(err);
}
+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));
+ }
+ /* 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);
+ 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 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->super_for_commit;
+ dev_item = &sb->dev_item;
+ list_for_each(cur, head) {
+ dev = list_entry(cur, struct btrfs_device, dev_list);
+ 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);
+
+ memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE);
+ dev->pending_io = bh;
+
+ get_bh(bh);
+ set_buffer_uptodate(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);
+ }
+ 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);
+ 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);
+ if (!buffer_uptodate(bh))
+ total_errors++;
+ } else {
+ 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 write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
*root)
{
int ret;
- struct extent_buffer *super = root->fs_info->sb_buffer;
- struct inode *btree_inode = root->fs_info->btree_inode;
- set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
- ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
- super->start, super->len);
+ ret = write_all_supers(root);
return ret;
}
{
radix_tree_delete(&fs_info->fs_roots_radix,
(unsigned long)root->root_key.objectid);
- btrfs_sysfs_del_root(root);
+ if (root->in_sysfs)
+ btrfs_sysfs_del_root(root);
if (root->inode)
iput(root->inode);
if (root->node)
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);
+ if (fs_info->delalloc_bytes) {
+ printk("btrfs: at unmount delalloc count %Lu\n",
+ fs_info->delalloc_bytes);
+ }
if (fs_info->extent_root->node)
free_extent_buffer(fs_info->extent_root->node);
if (fs_info->tree_root->node)
free_extent_buffer(fs_info->tree_root->node);
- free_extent_buffer(fs_info->sb_buffer);
+ 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);
btrfs_free_block_groups(root->fs_info);
del_fs_roots(fs_info);
filemap_write_and_wait(fs_info->btree_inode->i_mapping);
- extent_map_tree_empty_lru(&fs_info->free_space_cache);
- extent_map_tree_empty_lru(&fs_info->block_group_cache);
- extent_map_tree_empty_lru(&fs_info->pinned_extents);
- extent_map_tree_empty_lru(&fs_info->pending_del);
- extent_map_tree_empty_lru(&fs_info->extent_ins);
- extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree);
-
truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
+ btrfs_stop_workers(&fs_info->fixup_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
while(!list_empty(&fs_info->hashers)) {
kfree(hasher);
}
#endif
+ 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);
+ kfree(fs_info->chunk_root);
+ kfree(fs_info->dev_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)->extent_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)
{
struct inode *btree_inode = buf->first_page->mapping->host;
- return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
+ return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
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,
transid, root->fs_info->generation);
WARN_ON(1);
}
- set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
+ set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
}
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)->extent_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)->extent_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)->extent_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)->extent_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG_DONE, 0);
-}
-
-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)->extent_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG_DONE, GFP_NOFS);
-}
-
-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)->extent_tree,
- buf->start, buf->start + buf->len - 1,
- EXTENT_DEFRAG, GFP_NOFS);
+ /*
+ * 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 = 16 * 1024 * 1024;
+ tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree;
+
+ if (current_is_pdflush())
+ return;
+
+ 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_read_buffer(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 read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
- buf, 0, 1);
+ int ret;
+ ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid);
+ if (ret == 0) {
+ buf->flags |= EXTENT_UPTODATE;
+ }
+ return ret;
}
-static struct extent_map_ops btree_extent_map_ops = {
+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.samba.org / sfrench / cifs-2.6.git / blobdiff