W: http://bu3sch.de/btgpio.php
S: Maintained
+BTRFS FILE SYSTEM
+P: Chris Mason
+M: chris.mason@oracle.com
+L: linux-btrfs@vger.kernel.org
+W: http://btrfs.wiki.kernel.org/
+T: git kernel.org:/pub/scm/linux/kernel/git/mason/btrfs-unstable.git
+S: Maintained
+
BTTV VIDEO4LINUX DRIVER
P: Mauro Carvalho Chehab
M: mchehab@infradead.org
* Boston, MA 021110-1307, USA.
*/
-#include <linux/version.h>
#include <linux/kthread.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/bit_spinlock.h>
-#include <linux/version.h>
#include <linux/pagevec.h>
#include "compat.h"
#include "ctree.h"
struct btrfs_disk_key disk_key;
u32 nritems;
u64 search;
- u64 lowest_read;
- u64 highest_read;
+ u64 target;
u64 nread = 0;
int direction = path->reada;
struct extent_buffer *eb;
return;
}
- highest_read = search;
- lowest_read = search;
+ target = search;
nritems = btrfs_header_nritems(node);
nr = slot;
break;
}
search = btrfs_node_blockptr(node, nr);
- if ((search >= lowest_read && search <= highest_read) ||
- (search < lowest_read && lowest_read - search <= 16384) ||
- (search > highest_read && search - highest_read <= 16384)) {
+ if ((search <= target && target - search <= 65536) ||
+ (search > target && search - target <= 65536)) {
readahead_tree_block(root, search, blocksize,
btrfs_node_ptr_generation(node, nr));
nread += blocksize;
}
nscan++;
- if (path->reada < 2 && (nread > (64 * 1024) || nscan > 32))
+ if ((nread > 65536 || nscan > 32))
break;
-
- if (nread > (256 * 1024) || nscan > 128)
- break;
-
- if (search < lowest_read)
- lowest_read = search;
- if (search > highest_read)
- highest_read = search;
}
}
__le32 nsec;
} __attribute__ ((__packed__));
-typedef enum {
+enum btrfs_compression_type {
BTRFS_COMPRESS_NONE = 0,
BTRFS_COMPRESS_ZLIB = 1,
BTRFS_COMPRESS_LAST = 2,
-} btrfs_compression_type;
-
-/* we don't understand any encryption methods right now */
-typedef enum {
- BTRFS_ENCRYPTION_NONE = 0,
- BTRFS_ENCRYPTION_LAST = 1,
-} btrfs_encryption_type;
+};
struct btrfs_inode_item {
/* nfs style generation number */
struct btrfs_transaction *running_transaction;
wait_queue_head_t transaction_throttle;
wait_queue_head_t transaction_wait;
-
wait_queue_head_t async_submit_wait;
- wait_queue_head_t tree_log_wait;
struct btrfs_super_block super_copy;
struct btrfs_super_block super_for_commit;
atomic_t async_submit_draining;
atomic_t nr_async_bios;
atomic_t async_delalloc_pages;
- atomic_t tree_log_writers;
- atomic_t tree_log_commit;
- unsigned long tree_log_batch;
- u64 tree_log_transid;
/*
* this is used by the balancing code to wait for all the pending
struct kobject root_kobj;
struct completion kobj_unregister;
struct mutex objectid_mutex;
+
struct mutex log_mutex;
+ wait_queue_head_t log_writer_wait;
+ wait_queue_head_t log_commit_wait[2];
+ atomic_t log_writers;
+ atomic_t log_commit[2];
+ unsigned long log_transid;
+ unsigned long log_batch;
u64 objectid;
u64 last_trans;
* Boston, MA 021110-1307, USA.
*/
-#include <linux/version.h>
#include <linux/fs.h>
#include <linux/blkdev.h>
#include <linux/scatterlist.h>
spin_lock_init(&root->list_lock);
mutex_init(&root->objectid_mutex);
mutex_init(&root->log_mutex);
+ init_waitqueue_head(&root->log_writer_wait);
+ init_waitqueue_head(&root->log_commit_wait[0]);
+ init_waitqueue_head(&root->log_commit_wait[1]);
+ atomic_set(&root->log_commit[0], 0);
+ atomic_set(&root->log_commit[1], 0);
+ atomic_set(&root->log_writers, 0);
+ root->log_batch = 0;
+ root->log_transid = 0;
extent_io_tree_init(&root->dirty_log_pages,
fs_info->btree_inode->i_mapping, GFP_NOFS);
return 0;
}
-int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
- struct btrfs_fs_info *fs_info)
+static struct btrfs_root *alloc_log_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;
+ struct extent_buffer *leaf;
root = kzalloc(sizeof(*root), GFP_NOFS);
if (!root)
- return -ENOMEM;
+ return ERR_PTR(-ENOMEM);
__setup_root(tree_root->nodesize, tree_root->leafsize,
tree_root->sectorsize, tree_root->stripesize,
root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID;
root->root_key.type = BTRFS_ROOT_ITEM_KEY;
root->root_key.offset = BTRFS_TREE_LOG_OBJECTID;
+ /*
+ * log trees do not get reference counted because they go away
+ * before a real commit is actually done. They do store pointers
+ * to file data extents, and those reference counts still get
+ * updated (along with back refs to the log tree).
+ */
root->ref_cows = 0;
- root->node = btrfs_alloc_free_block(trans, root, root->leafsize,
- 0, BTRFS_TREE_LOG_OBJECTID,
- trans->transid, 0, 0, 0);
+ leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
+ 0, BTRFS_TREE_LOG_OBJECTID,
+ trans->transid, 0, 0, 0);
+ if (IS_ERR(leaf)) {
+ kfree(root);
+ return ERR_CAST(leaf);
+ }
+ root->node = leaf;
btrfs_set_header_nritems(root->node, 0);
btrfs_set_header_level(root->node, 0);
btrfs_set_header_bytenr(root->node, root->node->start);
BTRFS_FSID_SIZE);
btrfs_mark_buffer_dirty(root->node);
btrfs_tree_unlock(root->node);
- fs_info->log_root_tree = root;
+ return root;
+}
+
+int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *log_root;
+
+ log_root = alloc_log_tree(trans, fs_info);
+ if (IS_ERR(log_root))
+ return PTR_ERR(log_root);
+ WARN_ON(fs_info->log_root_tree);
+ fs_info->log_root_tree = log_root;
+ return 0;
+}
+
+int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root)
+{
+ struct btrfs_root *log_root;
+ struct btrfs_inode_item *inode_item;
+
+ log_root = alloc_log_tree(trans, root->fs_info);
+ if (IS_ERR(log_root))
+ return PTR_ERR(log_root);
+
+ log_root->last_trans = trans->transid;
+ log_root->root_key.offset = root->root_key.objectid;
+
+ inode_item = &log_root->root_item.inode;
+ inode_item->generation = cpu_to_le64(1);
+ inode_item->size = cpu_to_le64(3);
+ inode_item->nlink = cpu_to_le32(1);
+ inode_item->nbytes = cpu_to_le64(root->leafsize);
+ inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
+
+ btrfs_set_root_bytenr(&log_root->root_item, log_root->node->start);
+ btrfs_set_root_generation(&log_root->root_item, trans->transid);
+
+ WARN_ON(root->log_root);
+ root->log_root = log_root;
+ root->log_transid = 0;
return 0;
}
{
struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data;
int ret = 0;
- struct list_head *cur;
struct btrfs_device *device;
struct backing_dev_info *bdi;
#if 0
btrfs_congested_async(info, 0))
return 1;
#endif
- list_for_each(cur, &info->fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
bdi = blk_get_backing_dev_info(device->bdev);
*/
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);
+ list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
if (!device->bdev)
continue;
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;
__setup_root(4096, 4096, 4096, 4096, tree_root,
fs_info, BTRFS_ROOT_TREE_OBJECTID);
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)
+ if (IS_ERR(fs_info->cleaner_kthread))
goto fail_csum_root;
fs_info->transaction_kthread = kthread_run(transaction_kthread,
tree_root,
"btrfs-transaction");
- if (!fs_info->transaction_kthread)
+ if (IS_ERR(fs_info->transaction_kthread))
goto fail_cleaner;
if (btrfs_super_log_root(disk_super) != 0) {
fail_iput:
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
iput(fs_info->btree_inode);
-fail:
+
btrfs_close_devices(fs_info->fs_devices);
btrfs_mapping_tree_free(&fs_info->mapping_tree);
+ bdi_destroy(&fs_info->bdi);
+fail:
kfree(extent_root);
kfree(tree_root);
- bdi_destroy(&fs_info->bdi);
kfree(fs_info);
kfree(chunk_root);
kfree(dev_root);
int write_all_supers(struct btrfs_root *root, int max_mirrors)
{
- struct list_head *cur;
struct list_head *head = &root->fs_info->fs_devices->devices;
struct btrfs_device *dev;
struct btrfs_super_block *sb;
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);
+ list_for_each_entry(dev, head, dev_list) {
if (!dev->bdev) {
total_errors++;
continue;
}
total_errors = 0;
- list_for_each(cur, head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(dev, head, dev_list) {
if (!dev->bdev)
continue;
if (!dev->in_fs_metadata || !dev->writeable)
struct btrfs_fs_info *fs_info);
int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
+int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root);
int btree_lock_page_hook(struct page *page);
#endif
#include <linux/pagemap.h>
#include <linux/writeback.h>
#include <linux/blkdev.h>
-#include <linux/version.h>
#include "compat.h"
#include "hash.h"
#include "crc32c.h"
#include "volumes.h"
#include "locking.h"
#include "ref-cache.h"
-#include "compat.h"
#define PENDING_EXTENT_INSERT 0
#define PENDING_EXTENT_DELETE 1
u64 flags)
{
struct list_head *head = &info->space_info;
- struct list_head *cur;
struct btrfs_space_info *found;
- list_for_each(cur, head) {
- found = list_entry(cur, struct btrfs_space_info, list);
+ list_for_each_entry(found, head, list) {
if (found->flags == flags)
return found;
}
ret = find_first_extent_bit(&info->extent_ins, search, &start,
&end, EXTENT_WRITEBACK);
if (ret) {
- if (skipped && all && !num_inserts) {
+ if (skipped && all && !num_inserts &&
+ list_empty(&update_list)) {
skipped = 0;
search = 0;
continue;
if (ret) {
if (all && skipped && !nr) {
search = 0;
+ skipped = 0;
continue;
}
mutex_unlock(&info->extent_ins_mutex);
/* if metadata always pin */
if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID) {
if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) {
- struct btrfs_block_group_cache *cache;
-
- /* btrfs_free_reserved_extent */
- cache = btrfs_lookup_block_group(root->fs_info, bytenr);
- BUG_ON(!cache);
- btrfs_add_free_space(cache, bytenr, num_bytes);
- put_block_group(cache);
+ mutex_lock(&root->fs_info->pinned_mutex);
+ btrfs_update_pinned_extents(root, bytenr, num_bytes, 1);
+ mutex_unlock(&root->fs_info->pinned_mutex);
update_reserved_extents(root, bytenr, num_bytes, 0);
return 0;
}
static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
{
struct btrfs_block_group_cache *cache;
- struct list_head *l;
printk(KERN_INFO "space_info has %llu free, is %sfull\n",
(unsigned long long)(info->total_bytes - info->bytes_used -
(info->full) ? "" : "not ");
down_read(&info->groups_sem);
- list_for_each(l, &info->block_groups) {
- cache = list_entry(l, struct btrfs_block_group_cache, list);
+ list_for_each_entry(cache, &info->block_groups, list) {
spin_lock(&cache->lock);
printk(KERN_INFO "block group %llu has %llu bytes, %llu used "
"%llu pinned %llu reserved\n",
u64 lock_end = 0;
u64 num_bytes;
u64 ext_offset;
- u64 first_pos;
+ u64 search_end = (u64)-1;
u32 nritems;
int nr_scaned = 0;
int extent_locked = 0;
int ret;
memcpy(&key, leaf_key, sizeof(key));
- first_pos = INT_LIMIT(loff_t) - extent_key->offset;
if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS) {
if (key.objectid < ref_path->owner_objectid ||
(key.objectid == ref_path->owner_objectid &&
if ((key.objectid > ref_path->owner_objectid) ||
(key.objectid == ref_path->owner_objectid &&
key.type > BTRFS_EXTENT_DATA_KEY) ||
- (key.offset >= first_pos + extent_key->offset))
+ key.offset >= search_end)
break;
}
num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
ext_offset = btrfs_file_extent_offset(leaf, fi);
- if (first_pos > key.offset - ext_offset)
- first_pos = key.offset - ext_offset;
+ if (search_end == (u64)-1) {
+ search_end = key.offset - ext_offset +
+ btrfs_file_extent_ram_bytes(leaf, fi);
+ }
if (!extent_locked) {
lock_start = key.offset;
}
skip:
if (ref_path->owner_objectid != BTRFS_MULTIPLE_OBJECTIDS &&
- key.offset >= first_pos + extent_key->offset)
+ key.offset >= search_end)
break;
cond_resched();
path = btrfs_alloc_path();
BUG_ON(!path);
- btrfs_remove_free_space_cache(block_group);
+ spin_lock(&root->fs_info->block_group_cache_lock);
rb_erase(&block_group->cache_node,
&root->fs_info->block_group_cache_tree);
+ spin_unlock(&root->fs_info->block_group_cache_lock);
+ btrfs_remove_free_space_cache(block_group);
down_write(&block_group->space_info->groups_sem);
list_del(&block_group->list);
up_write(&block_group->space_info->groups_sem);
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/swap.h>
-#include <linux/version.h>
#include <linux/writeback.h>
#include <linux/pagevec.h>
#include "extent_io.h"
return sector;
}
+int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len, get_extent_t *get_extent)
+{
+ int ret;
+ u64 off = start;
+ u64 max = start + len;
+ u32 flags = 0;
+ u64 disko = 0;
+ struct extent_map *em = NULL;
+ int end = 0;
+ u64 em_start = 0, em_len = 0;
+ unsigned long emflags;
+ ret = 0;
+
+ if (len == 0)
+ return -EINVAL;
+
+ lock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
+ GFP_NOFS);
+ em = get_extent(inode, NULL, 0, off, max - off, 0);
+ if (!em)
+ goto out;
+ if (IS_ERR(em)) {
+ ret = PTR_ERR(em);
+ goto out;
+ }
+ while (!end) {
+ off = em->start + em->len;
+ if (off >= max)
+ end = 1;
+
+ em_start = em->start;
+ em_len = em->len;
+
+ disko = 0;
+ flags = 0;
+
+ switch (em->block_start) {
+ case EXTENT_MAP_LAST_BYTE:
+ end = 1;
+ flags |= FIEMAP_EXTENT_LAST;
+ break;
+ case EXTENT_MAP_HOLE:
+ flags |= FIEMAP_EXTENT_UNWRITTEN;
+ break;
+ case EXTENT_MAP_INLINE:
+ flags |= (FIEMAP_EXTENT_DATA_INLINE |
+ FIEMAP_EXTENT_NOT_ALIGNED);
+ break;
+ case EXTENT_MAP_DELALLOC:
+ flags |= (FIEMAP_EXTENT_DELALLOC |
+ FIEMAP_EXTENT_UNKNOWN);
+ break;
+ default:
+ disko = em->block_start;
+ break;
+ }
+ if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
+ flags |= FIEMAP_EXTENT_ENCODED;
+
+ emflags = em->flags;
+ free_extent_map(em);
+ em = NULL;
+
+ if (!end) {
+ em = get_extent(inode, NULL, 0, off, max - off, 0);
+ if (!em)
+ goto out;
+ if (IS_ERR(em)) {
+ ret = PTR_ERR(em);
+ goto out;
+ }
+ emflags = em->flags;
+ }
+ if (test_bit(EXTENT_FLAG_VACANCY, &emflags)) {
+ flags |= FIEMAP_EXTENT_LAST;
+ end = 1;
+ }
+
+ ret = fiemap_fill_next_extent(fieinfo, em_start, disko,
+ em_len, flags);
+ if (ret)
+ goto out_free;
+ }
+out_free:
+ free_extent_map(em);
+out:
+ unlock_extent(&BTRFS_I(inode)->io_tree, start, start + len,
+ GFP_NOFS);
+ return ret;
+}
+
static inline struct page *extent_buffer_page(struct extent_buffer *eb,
unsigned long i)
{
unsigned from, unsigned to);
sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
get_extent_t *get_extent);
+int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len, get_extent_t *get_extent);
int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/spinlock.h>
-#include <linux/version.h>
#include <linux/hardirq.h>
#include "extent_map.h"
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
-#include <linux/version.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
}
mutex_unlock(&root->fs_info->trans_mutex);
- root->fs_info->tree_log_batch++;
+ root->log_batch++;
filemap_fdatawrite(inode->i_mapping);
btrfs_wait_ordered_range(inode, 0, (u64)-1);
- root->fs_info->tree_log_batch++;
+ root->log_batch++;
/*
* ok we haven't committed the transaction yet, lets do a commit
#include <linux/statfs.h>
#include <linux/compat.h>
#include <linux/bit_spinlock.h>
-#include <linux/version.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/falloc.h>
struct inode *inode, u64 file_offset,
struct list_head *list)
{
- struct list_head *cur;
struct btrfs_ordered_sum *sum;
btrfs_set_trans_block_group(trans, inode);
- list_for_each(cur, list) {
- sum = list_entry(cur, struct btrfs_ordered_sum, list);
+
+ list_for_each_entry(sum, list, list) {
btrfs_csum_file_blocks(trans,
BTRFS_I(inode)->root->fs_info->csum_root, sum);
}
return -EINVAL;
}
-static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
+static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len)
{
- return extent_bmap(mapping, iblock, btrfs_get_extent);
+ return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent);
}
int btrfs_readpage(struct file *file, struct page *page)
.clear_bit_hook = btrfs_clear_bit_hook,
};
+/*
+ * btrfs doesn't support the bmap operation because swapfiles
+ * use bmap to make a mapping of extents in the file. They assume
+ * these extents won't change over the life of the file and they
+ * use the bmap result to do IO directly to the drive.
+ *
+ * the btrfs bmap call would return logical addresses that aren't
+ * suitable for IO and they also will change frequently as COW
+ * operations happen. So, swapfile + btrfs == corruption.
+ *
+ * For now we're avoiding this by dropping bmap.
+ */
static struct address_space_operations btrfs_aops = {
.readpage = btrfs_readpage,
.writepage = btrfs_writepage,
.writepages = btrfs_writepages,
.readpages = btrfs_readpages,
.sync_page = block_sync_page,
- .bmap = btrfs_bmap,
.direct_IO = btrfs_direct_IO,
.invalidatepage = btrfs_invalidatepage,
.releasepage = btrfs_releasepage,
.removexattr = btrfs_removexattr,
.permission = btrfs_permission,
.fallocate = btrfs_fallocate,
+ .fiemap = btrfs_fiemap,
};
static struct inode_operations btrfs_special_inode_operations = {
.getattr = btrfs_getattr,
#include <linux/compat.h>
#include <linux/bit_spinlock.h>
#include <linux/security.h>
-#include <linux/version.h>
#include <linux/xattr.h>
#include <linux/vmalloc.h>
#include "compat.h"
struct btrfs_sector_sum *sector_sums;
struct btrfs_ordered_extent *ordered;
struct btrfs_ordered_inode_tree *tree = &BTRFS_I(inode)->ordered_tree;
- struct list_head *cur;
unsigned long num_sectors;
unsigned long i;
u32 sectorsize = BTRFS_I(inode)->root->sectorsize;
return 1;
mutex_lock(&tree->mutex);
- list_for_each_prev(cur, &ordered->list) {
- ordered_sum = list_entry(cur, struct btrfs_ordered_sum, list);
+ list_for_each_entry_reverse(ordered_sum, &ordered->list, list) {
if (disk_bytenr >= ordered_sum->bytenr) {
num_sectors = ordered_sum->len / sectorsize;
sector_sums = ordered_sum->sums;
#include <linux/ctype.h>
#include <linux/namei.h>
#include <linux/miscdevice.h>
-#include <linux/version.h>
#include <linux/magic.h>
#include "compat.h"
#include "ctree.h"
struct btrfs_ioctl_vol_args *vol;
struct btrfs_fs_devices *fs_devices;
int ret = -ENOTTY;
- int len;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vol = kmalloc(sizeof(*vol), GFP_KERNEL);
+ if (!vol)
+ return -ENOMEM;
+
if (copy_from_user(vol, (void __user *)arg, sizeof(*vol))) {
ret = -EFAULT;
goto out;
}
- len = strnlen(vol->name, BTRFS_PATH_NAME_MAX);
switch (cmd) {
case BTRFS_IOC_SCAN_DEV:
{
struct btrfs_pending_snapshot *pending;
struct list_head *head = &trans->transaction->pending_snapshots;
- struct list_head *cur;
int ret;
- list_for_each(cur, head) {
- pending = list_entry(cur, struct btrfs_pending_snapshot, list);
+ list_for_each_entry(pending, head, list) {
ret = create_pending_snapshot(trans, fs_info, pending);
BUG_ON(ret);
}
* and once to do all the other items.
*/
-/*
- * btrfs_add_log_tree adds a new per-subvolume log tree into the
- * tree of log tree roots. This must be called with a tree log transaction
- * running (see start_log_trans).
- */
-static int btrfs_add_log_tree(struct btrfs_trans_handle *trans,
- struct btrfs_root *root)
-{
- struct btrfs_key key;
- struct btrfs_root_item root_item;
- struct btrfs_inode_item *inode_item;
- struct extent_buffer *leaf;
- struct btrfs_root *new_root = root;
- int ret;
- u64 objectid = root->root_key.objectid;
-
- leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0,
- BTRFS_TREE_LOG_OBJECTID,
- trans->transid, 0, 0, 0);
- if (IS_ERR(leaf)) {
- ret = PTR_ERR(leaf);
- return ret;
- }
-
- btrfs_set_header_nritems(leaf, 0);
- btrfs_set_header_level(leaf, 0);
- btrfs_set_header_bytenr(leaf, leaf->start);
- btrfs_set_header_generation(leaf, trans->transid);
- btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID);
-
- write_extent_buffer(leaf, root->fs_info->fsid,
- (unsigned long)btrfs_header_fsid(leaf),
- BTRFS_FSID_SIZE);
- btrfs_mark_buffer_dirty(leaf);
-
- inode_item = &root_item.inode;
- memset(inode_item, 0, sizeof(*inode_item));
- inode_item->generation = cpu_to_le64(1);
- inode_item->size = cpu_to_le64(3);
- inode_item->nlink = cpu_to_le32(1);
- inode_item->nbytes = cpu_to_le64(root->leafsize);
- inode_item->mode = cpu_to_le32(S_IFDIR | 0755);
-
- btrfs_set_root_bytenr(&root_item, leaf->start);
- btrfs_set_root_generation(&root_item, trans->transid);
- btrfs_set_root_level(&root_item, 0);
- btrfs_set_root_refs(&root_item, 0);
- btrfs_set_root_used(&root_item, 0);
-
- memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
- root_item.drop_level = 0;
-
- btrfs_tree_unlock(leaf);
- free_extent_buffer(leaf);
- leaf = NULL;
-
- btrfs_set_root_dirid(&root_item, 0);
-
- key.objectid = BTRFS_TREE_LOG_OBJECTID;
- key.offset = objectid;
- btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
- ret = btrfs_insert_root(trans, root->fs_info->log_root_tree, &key,
- &root_item);
- if (ret)
- goto fail;
-
- new_root = btrfs_read_fs_root_no_radix(root->fs_info->log_root_tree,
- &key);
- BUG_ON(!new_root);
-
- WARN_ON(root->log_root);
- root->log_root = new_root;
-
- /*
- * log trees do not get reference counted because they go away
- * before a real commit is actually done. They do store pointers
- * to file data extents, and those reference counts still get
- * updated (along with back refs to the log tree).
- */
- new_root->ref_cows = 0;
- new_root->last_trans = trans->transid;
-
- /*
- * we need to make sure the root block for this new tree
- * is marked as dirty in the dirty_log_pages tree. This
- * is how it gets flushed down to disk at tree log commit time.
- *
- * the tree logging mutex keeps others from coming in and changing
- * the new_root->node, so we can safely access it here
- */
- set_extent_dirty(&new_root->dirty_log_pages, new_root->node->start,
- new_root->node->start + new_root->node->len - 1,
- GFP_NOFS);
-
-fail:
- return ret;
-}
-
/*
* start a sub transaction and setup the log tree
* this increments the log tree writer count to make the people
struct btrfs_root *root)
{
int ret;
+
+ mutex_lock(&root->log_mutex);
+ if (root->log_root) {
+ root->log_batch++;
+ atomic_inc(&root->log_writers);
+ mutex_unlock(&root->log_mutex);
+ return 0;
+ }
mutex_lock(&root->fs_info->tree_log_mutex);
if (!root->fs_info->log_root_tree) {
ret = btrfs_init_log_root_tree(trans, root->fs_info);
ret = btrfs_add_log_tree(trans, root);
BUG_ON(ret);
}
- atomic_inc(&root->fs_info->tree_log_writers);
- root->fs_info->tree_log_batch++;
mutex_unlock(&root->fs_info->tree_log_mutex);
+ root->log_batch++;
+ atomic_inc(&root->log_writers);
+ mutex_unlock(&root->log_mutex);
return 0;
}
if (!root->log_root)
return -ENOENT;
- mutex_lock(&root->fs_info->tree_log_mutex);
+ mutex_lock(&root->log_mutex);
if (root->log_root) {
ret = 0;
- atomic_inc(&root->fs_info->tree_log_writers);
- root->fs_info->tree_log_batch++;
+ atomic_inc(&root->log_writers);
}
- mutex_unlock(&root->fs_info->tree_log_mutex);
+ mutex_unlock(&root->log_mutex);
return ret;
}
*/
static int end_log_trans(struct btrfs_root *root)
{
- atomic_dec(&root->fs_info->tree_log_writers);
- smp_mb();
- if (waitqueue_active(&root->fs_info->tree_log_wait))
- wake_up(&root->fs_info->tree_log_wait);
+ if (atomic_dec_and_test(&root->log_writers)) {
+ smp_mb();
+ if (waitqueue_active(&root->log_writer_wait))
+ wake_up(&root->log_writer_wait);
+ }
return 0;
}
}
}
btrfs_free_path(path);
- if (wc->free)
- free_extent_buffer(log->node);
return ret;
}
-static int wait_log_commit(struct btrfs_root *log)
+/*
+ * helper function to update the item for a given subvolumes log root
+ * in the tree of log roots
+ */
+static int update_log_root(struct btrfs_trans_handle *trans,
+ struct btrfs_root *log)
+{
+ int ret;
+
+ if (log->log_transid == 1) {
+ /* insert root item on the first sync */
+ ret = btrfs_insert_root(trans, log->fs_info->log_root_tree,
+ &log->root_key, &log->root_item);
+ } else {
+ ret = btrfs_update_root(trans, log->fs_info->log_root_tree,
+ &log->root_key, &log->root_item);
+ }
+ return ret;
+}
+
+static int wait_log_commit(struct btrfs_root *root, unsigned long transid)
{
DEFINE_WAIT(wait);
- u64 transid = log->fs_info->tree_log_transid;
+ int index = transid % 2;
+ /*
+ * we only allow two pending log transactions at a time,
+ * so we know that if ours is more than 2 older than the
+ * current transaction, we're done
+ */
do {
- prepare_to_wait(&log->fs_info->tree_log_wait, &wait,
- TASK_UNINTERRUPTIBLE);
- mutex_unlock(&log->fs_info->tree_log_mutex);
- if (atomic_read(&log->fs_info->tree_log_commit))
+ prepare_to_wait(&root->log_commit_wait[index],
+ &wait, TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&root->log_mutex);
+ if (root->log_transid < transid + 2 &&
+ atomic_read(&root->log_commit[index]))
schedule();
- finish_wait(&log->fs_info->tree_log_wait, &wait);
- mutex_lock(&log->fs_info->tree_log_mutex);
- } while (transid == log->fs_info->tree_log_transid &&
- atomic_read(&log->fs_info->tree_log_commit));
+ finish_wait(&root->log_commit_wait[index], &wait);
+ mutex_lock(&root->log_mutex);
+ } while (root->log_transid < transid + 2 &&
+ atomic_read(&root->log_commit[index]));
+ return 0;
+}
+
+static int wait_for_writer(struct btrfs_root *root)
+{
+ DEFINE_WAIT(wait);
+ while (atomic_read(&root->log_writers)) {
+ prepare_to_wait(&root->log_writer_wait,
+ &wait, TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&root->log_mutex);
+ if (atomic_read(&root->log_writers))
+ schedule();
+ mutex_lock(&root->log_mutex);
+ finish_wait(&root->log_writer_wait, &wait);
+ }
return 0;
}
int btrfs_sync_log(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
+ int index1;
+ int index2;
int ret;
- unsigned long batch;
struct btrfs_root *log = root->log_root;
+ struct btrfs_root *log_root_tree = root->fs_info->log_root_tree;
- mutex_lock(&log->fs_info->tree_log_mutex);
- if (atomic_read(&log->fs_info->tree_log_commit)) {
- wait_log_commit(log);
- goto out;
+ mutex_lock(&root->log_mutex);
+ index1 = root->log_transid % 2;
+ if (atomic_read(&root->log_commit[index1])) {
+ wait_log_commit(root, root->log_transid);
+ mutex_unlock(&root->log_mutex);
+ return 0;
}
- atomic_set(&log->fs_info->tree_log_commit, 1);
+ atomic_set(&root->log_commit[index1], 1);
+
+ /* wait for previous tree log sync to complete */
+ if (atomic_read(&root->log_commit[(index1 + 1) % 2]))
+ wait_log_commit(root, root->log_transid - 1);
while (1) {
- batch = log->fs_info->tree_log_batch;
- mutex_unlock(&log->fs_info->tree_log_mutex);
+ unsigned long batch = root->log_batch;
+ mutex_unlock(&root->log_mutex);
schedule_timeout_uninterruptible(1);
- mutex_lock(&log->fs_info->tree_log_mutex);
-
- while (atomic_read(&log->fs_info->tree_log_writers)) {
- DEFINE_WAIT(wait);
- prepare_to_wait(&log->fs_info->tree_log_wait, &wait,
- TASK_UNINTERRUPTIBLE);
- mutex_unlock(&log->fs_info->tree_log_mutex);
- if (atomic_read(&log->fs_info->tree_log_writers))
- schedule();
- mutex_lock(&log->fs_info->tree_log_mutex);
- finish_wait(&log->fs_info->tree_log_wait, &wait);
- }
- if (batch == log->fs_info->tree_log_batch)
+ mutex_lock(&root->log_mutex);
+ wait_for_writer(root);
+ if (batch == root->log_batch)
break;
}
ret = btrfs_write_and_wait_marked_extents(log, &log->dirty_log_pages);
BUG_ON(ret);
- ret = btrfs_write_and_wait_marked_extents(root->fs_info->log_root_tree,
- &root->fs_info->log_root_tree->dirty_log_pages);
+
+ btrfs_set_root_bytenr(&log->root_item, log->node->start);
+ btrfs_set_root_generation(&log->root_item, trans->transid);
+ btrfs_set_root_level(&log->root_item, btrfs_header_level(log->node));
+
+ root->log_batch = 0;
+ root->log_transid++;
+ log->log_transid = root->log_transid;
+ smp_mb();
+ /*
+ * log tree has been flushed to disk, new modifications of
+ * the log will be written to new positions. so it's safe to
+ * allow log writers to go in.
+ */
+ mutex_unlock(&root->log_mutex);
+
+ mutex_lock(&log_root_tree->log_mutex);
+ log_root_tree->log_batch++;
+ atomic_inc(&log_root_tree->log_writers);
+ mutex_unlock(&log_root_tree->log_mutex);
+
+ ret = update_log_root(trans, log);
+ BUG_ON(ret);
+
+ mutex_lock(&log_root_tree->log_mutex);
+ if (atomic_dec_and_test(&log_root_tree->log_writers)) {
+ smp_mb();
+ if (waitqueue_active(&log_root_tree->log_writer_wait))
+ wake_up(&log_root_tree->log_writer_wait);
+ }
+
+ index2 = log_root_tree->log_transid % 2;
+ if (atomic_read(&log_root_tree->log_commit[index2])) {
+ wait_log_commit(log_root_tree, log_root_tree->log_transid);
+ mutex_unlock(&log_root_tree->log_mutex);
+ goto out;
+ }
+ atomic_set(&log_root_tree->log_commit[index2], 1);
+
+ if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2]))
+ wait_log_commit(log_root_tree, log_root_tree->log_transid - 1);
+
+ wait_for_writer(log_root_tree);
+
+ ret = btrfs_write_and_wait_marked_extents(log_root_tree,
+ &log_root_tree->dirty_log_pages);
BUG_ON(ret);
btrfs_set_super_log_root(&root->fs_info->super_for_commit,
- log->fs_info->log_root_tree->node->start);
+ log_root_tree->node->start);
btrfs_set_super_log_root_level(&root->fs_info->super_for_commit,
- btrfs_header_level(log->fs_info->log_root_tree->node));
+ btrfs_header_level(log_root_tree->node));
+
+ log_root_tree->log_batch = 0;
+ log_root_tree->log_transid++;
+ smp_mb();
+
+ mutex_unlock(&log_root_tree->log_mutex);
+
+ /*
+ * nobody else is going to jump in and write the the ctree
+ * super here because the log_commit atomic below is protecting
+ * us. We must be called with a transaction handle pinning
+ * the running transaction open, so a full commit can't hop
+ * in and cause problems either.
+ */
+ write_ctree_super(trans, root->fs_info->tree_root, 2);
- write_ctree_super(trans, log->fs_info->tree_root, 2);
- log->fs_info->tree_log_transid++;
- log->fs_info->tree_log_batch = 0;
- atomic_set(&log->fs_info->tree_log_commit, 0);
+ atomic_set(&log_root_tree->log_commit[index2], 0);
smp_mb();
- if (waitqueue_active(&log->fs_info->tree_log_wait))
- wake_up(&log->fs_info->tree_log_wait);
+ if (waitqueue_active(&log_root_tree->log_commit_wait[index2]))
+ wake_up(&log_root_tree->log_commit_wait[index2]);
out:
- mutex_unlock(&log->fs_info->tree_log_mutex);
+ atomic_set(&root->log_commit[index1], 0);
+ smp_mb();
+ if (waitqueue_active(&root->log_commit_wait[index1]))
+ wake_up(&root->log_commit_wait[index1]);
return 0;
}
start, end, GFP_NOFS);
}
- log = root->log_root;
- ret = btrfs_del_root(trans, root->fs_info->log_root_tree,
- &log->root_key);
- BUG_ON(ret);
+ if (log->log_transid > 0) {
+ ret = btrfs_del_root(trans, root->fs_info->log_root_tree,
+ &log->root_key);
+ BUG_ON(ret);
+ }
root->log_root = NULL;
- kfree(root->log_root);
+ free_extent_buffer(log->node);
+ kfree(log);
return 0;
}
-/*
- * helper function to update the item for a given subvolumes log root
- * in the tree of log roots
- */
-static int update_log_root(struct btrfs_trans_handle *trans,
- struct btrfs_root *log)
-{
- u64 bytenr = btrfs_root_bytenr(&log->root_item);
- int ret;
-
- if (log->node->start == bytenr)
- return 0;
-
- btrfs_set_root_bytenr(&log->root_item, log->node->start);
- btrfs_set_root_generation(&log->root_item, trans->transid);
- btrfs_set_root_level(&log->root_item, btrfs_header_level(log->node));
- ret = btrfs_update_root(trans, log->fs_info->log_root_tree,
- &log->root_key, &log->root_item);
- BUG_ON(ret);
- return ret;
-}
-
/*
* If both a file and directory are logged, and unlinks or renames are
* mixed in, we have a few interesting corners:
btrfs_free_path(path);
btrfs_free_path(dst_path);
-
- mutex_lock(&root->fs_info->tree_log_mutex);
- ret = update_log_root(trans, log);
- BUG_ON(ret);
- mutex_unlock(&root->fs_info->tree_log_mutex);
out:
return 0;
}
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
#include <linux/random.h>
-#include <linux/version.h>
#include <asm/div64.h>
#include "compat.h"
#include "ctree.h"
u64 devid, u8 *uuid)
{
struct btrfs_device *dev;
- struct list_head *cur;
- list_for_each(cur, head) {
- dev = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(dev, head, dev_list) {
if (dev->devid == devid &&
(!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
return dev;
static noinline struct btrfs_fs_devices *find_fsid(u8 *fsid)
{
- struct list_head *cur;
struct btrfs_fs_devices *fs_devices;
- list_for_each(cur, &fs_uuids) {
- fs_devices = list_entry(cur, struct btrfs_fs_devices, list);
+ list_for_each_entry(fs_devices, &fs_uuids, list) {
if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0)
return fs_devices;
}
int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices)
{
- struct list_head *tmp;
- struct list_head *cur;
- struct btrfs_device *device;
+ struct btrfs_device *device, *next;
mutex_lock(&uuid_mutex);
again:
- list_for_each_safe(cur, tmp, &fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
if (device->in_fs_metadata)
continue;
static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
{
- struct list_head *cur;
struct btrfs_device *device;
if (--fs_devices->opened > 0)
return 0;
- list_for_each(cur, &fs_devices->devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, &fs_devices->devices, dev_list) {
if (device->bdev) {
close_bdev_exclusive(device->bdev, device->mode);
fs_devices->open_devices--;
{
struct block_device *bdev;
struct list_head *head = &fs_devices->devices;
- struct list_head *cur;
struct btrfs_device *device;
struct block_device *latest_bdev = NULL;
struct buffer_head *bh;
int seeding = 1;
int ret = 0;
- list_for_each(cur, head) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, head, dev_list) {
if (device->bdev)
continue;
if (!device->name)
*(unsigned long long *)disk_super->fsid,
*(unsigned long long *)(disk_super->fsid + 8));
}
- printk(KERN_INFO "devid %llu transid %llu %s\n",
+ printk(KERN_CONT "devid %llu transid %llu %s\n",
(unsigned long long)devid, (unsigned long long)transid, path);
ret = device_list_add(path, disk_super, devid, fs_devices_ret);
}
if (strcmp(device_path, "missing") == 0) {
- struct list_head *cur;
struct list_head *devices;
struct btrfs_device *tmp;
device = NULL;
devices = &root->fs_info->fs_devices->devices;
- list_for_each(cur, devices) {
- tmp = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(tmp, devices, dev_list) {
if (tmp->in_fs_metadata && !tmp->bdev) {
device = tmp;
break;
struct btrfs_trans_handle *trans;
struct btrfs_device *device;
struct block_device *bdev;
- struct list_head *cur;
struct list_head *devices;
struct super_block *sb = root->fs_info->sb;
u64 total_bytes;
mutex_lock(&root->fs_info->volume_mutex);
devices = &root->fs_info->fs_devices->devices;
- list_for_each(cur, devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, devices, dev_list) {
if (device->bdev == bdev) {
ret = -EEXIST;
goto error;
int btrfs_balance(struct btrfs_root *dev_root)
{
int ret;
- struct list_head *cur;
struct list_head *devices = &dev_root->fs_info->fs_devices->devices;
struct btrfs_device *device;
u64 old_size;
dev_root = dev_root->fs_info->dev_root;
/* step one make some room on all the devices */
- list_for_each(cur, devices) {
- device = list_entry(cur, struct btrfs_device, dev_list);
+ list_for_each_entry(device, devices, dev_list) {
old_size = device->total_bytes;
size_to_free = div_factor(old_size, 1);
size_to_free = min(size_to_free, (u64)1 * 1024 * 1024);
/* lookup the xattr by name */
di = btrfs_lookup_xattr(NULL, root, path, inode->i_ino, name,
strlen(name), 0);
- if (!di || IS_ERR(di)) {
+ if (!di) {
ret = -ENODATA;
goto out;
+ } else if (IS_ERR(di)) {
+ ret = PTR_ERR(di);
+ goto out;
}
leaf = path->nodes[0];
ret = -ERANGE;
goto out;
}
+
+ /*
+ * The way things are packed into the leaf is like this
+ * |struct btrfs_dir_item|name|data|
+ * where name is the xattr name, so security.foo, and data is the
+ * content of the xattr. data_ptr points to the location in memory
+ * where the data starts in the in memory leaf
+ */
data_ptr = (unsigned long)((char *)(di + 1) +
btrfs_dir_name_len(leaf, di));
read_extent_buffer(leaf, buffer, data_ptr,
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto err;
- ret = 0;
advance = 0;
while (1) {
leaf = path->nodes[0];
projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / commitdiff