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Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable

Browse source 
* git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable:
  Btrfs: fix panic when trying to destroy a newly allocated
  Btrfs: allow more metadata chunk preallocation
  Btrfs: fallback on uncompressed io if compressed io fails
  Btrfs: find ideal block group for caching
  Btrfs: avoid null deref in unpin_extent_cache()
  Btrfs: skip btrfs_release_path in btrfs_update_root and btrfs_del_root
  Btrfs: fix some metadata enospc issues
  Btrfs: fix how we set max_size for free space clusters
  Btrfs: cleanup transaction starting and fix journal_info usage
  Btrfs: fix data allocation hint start
This commit is contained in:
Linus Torvalds 2009-11-11 13:38:59 -08:00
commit aa021baa32
6 changed files with 183 additions and 50 deletions
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113
fs/btrfs/extent-tree.c
View file

@ -2977,10 +2977,10 @@ static int maybe_allocate_chunk(struct btrfs_root *root,
free_space = btrfs_super_total_bytes(disk_super);
/*
* we allow the metadata to grow to a max of either 5gb or 5% of the
* we allow the metadata to grow to a max of either 10gb or 5% of the
* space in the volume.
*/
min_metadata = min((u64)5 * 1024 * 1024 * 1024,
min_metadata = min((u64)10 * 1024 * 1024 * 1024,
div64_u64(free_space * 5, 100));
if (info->total_bytes >= min_metadata) {
spin_unlock(&info->lock);
@ -4102,7 +4102,7 @@ wait_block_group_cache_done(struct btrfs_block_group_cache *cache)
}
enum btrfs_loop_type {
LOOP_CACHED_ONLY = 0,
LOOP_FIND_IDEAL = 0,
LOOP_CACHING_NOWAIT = 1,
LOOP_CACHING_WAIT = 2,
LOOP_ALLOC_CHUNK = 3,
@ -4131,12 +4131,15 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
struct btrfs_block_group_cache *block_group = NULL;
int empty_cluster = 2 * 1024 * 1024;
int allowed_chunk_alloc = 0;
int done_chunk_alloc = 0;
struct btrfs_space_info *space_info;
int last_ptr_loop = 0;
int loop = 0;
bool found_uncached_bg = false;
bool failed_cluster_refill = false;
bool failed_alloc = false;
u64 ideal_cache_percent = 0;
u64 ideal_cache_offset = 0;
WARN_ON(num_bytes < root->sectorsize);
btrfs_set_key_type(ins, BTRFS_EXTENT_ITEM_KEY);
@ -4172,14 +4175,19 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
empty_cluster = 0;
if (search_start == hint_byte) {
ideal_cache:
block_group = btrfs_lookup_block_group(root->fs_info,
search_start);
/*
* we don't want to use the block group if it doesn't match our
* allocation bits, or if its not cached.
*
* However if we are re-searching with an ideal block group
* picked out then we don't care that the block group is cached.
*/
if (block_group && block_group_bits(block_group, data) &&
block_group_cache_done(block_group)) {
(block_group->cached != BTRFS_CACHE_NO ||
search_start == ideal_cache_offset)) {
down_read(&space_info->groups_sem);
if (list_empty(&block_group->list) ||
block_group->ro) {
@ -4191,13 +4199,13 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
*/
btrfs_put_block_group(block_group);
up_read(&space_info->groups_sem);
} else
} else {
goto have_block_group;
}
} else if (block_group) {
btrfs_put_block_group(block_group);
}
}
search:
down_read(&space_info->groups_sem);
list_for_each_entry(block_group, &space_info->block_groups, list) {
@ -4209,28 +4217,45 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
have_block_group:
if (unlikely(block_group->cached == BTRFS_CACHE_NO)) {
u64 free_percent;
free_percent = btrfs_block_group_used(&block_group->item);
free_percent *= 100;
free_percent = div64_u64(free_percent,
block_group->key.offset);
free_percent = 100 - free_percent;
if (free_percent > ideal_cache_percent &&
likely(!block_group->ro)) {
ideal_cache_offset = block_group->key.objectid;
ideal_cache_percent = free_percent;
}
/*
* we want to start caching kthreads, but not too many
* right off the bat so we don't overwhelm the system,
* so only start them if there are less than 2 and we're
* in the initial allocation phase.
* We only want to start kthread caching if we are at
* the point where we will wait for caching to make
* progress, or if our ideal search is over and we've
* found somebody to start caching.
*/
if (loop > LOOP_CACHING_NOWAIT ||
atomic_read(&space_info->caching_threads) < 2) {
(loop > LOOP_FIND_IDEAL &&
atomic_read(&space_info->caching_threads) < 2)) {
ret = cache_block_group(block_group);
BUG_ON(ret);
}
found_uncached_bg = true;
/*
* If loop is set for cached only, try the next block
* group.
*/
if (loop == LOOP_FIND_IDEAL)
goto loop;
}
cached = block_group_cache_done(block_group);
if (unlikely(!cached)) {
if (unlikely(!cached))
found_uncached_bg = true;
/* if we only want cached bgs, loop */
if (loop == LOOP_CACHED_ONLY)
goto loop;
}
if (unlikely(block_group->ro))
goto loop;
@ -4410,9 +4435,11 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
}
up_read(&space_info->groups_sem);
/* LOOP_CACHED_ONLY, only search fully cached block groups
* LOOP_CACHING_NOWAIT, search partially cached block groups, but
* dont wait foR them to finish caching
/* LOOP_FIND_IDEAL, only search caching/cached bg's, and don't wait for
* for them to make caching progress. Also
* determine the best possible bg to cache
* LOOP_CACHING_NOWAIT, search partially cached block groups, kicking
* caching kthreads as we move along
* LOOP_CACHING_WAIT, search everything, and wait if our bg is caching
* LOOP_ALLOC_CHUNK, force a chunk allocation and try again
* LOOP_NO_EMPTY_SIZE, set empty_size and empty_cluster to 0 and try
@ -4421,12 +4448,47 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE &&
(found_uncached_bg || empty_size || empty_cluster ||
allowed_chunk_alloc)) {
if (found_uncached_bg) {
if (loop == LOOP_FIND_IDEAL && found_uncached_bg) {
found_uncached_bg = false;
if (loop < LOOP_CACHING_WAIT) {
loop++;
loop++;
if (!ideal_cache_percent &&
atomic_read(&space_info->caching_threads))
goto search;
}
/*
* 1 of the following 2 things have happened so far
*
* 1) We found an ideal block group for caching that
* is mostly full and will cache quickly, so we might
* as well wait for it.
*
* 2) We searched for cached only and we didn't find
* anything, and we didn't start any caching kthreads
* either, so chances are we will loop through and
* start a couple caching kthreads, and then come back
* around and just wait for them. This will be slower
* because we will have 2 caching kthreads reading at
* the same time when we could have just started one
* and waited for it to get far enough to give us an
* allocation, so go ahead and go to the wait caching
* loop.
*/
loop = LOOP_CACHING_WAIT;
search_start = ideal_cache_offset;
ideal_cache_percent = 0;
goto ideal_cache;
} else if (loop == LOOP_FIND_IDEAL) {
/*
* Didn't find a uncached bg, wait on anything we find
* next.
*/
loop = LOOP_CACHING_WAIT;
goto search;
}
if (loop < LOOP_CACHING_WAIT) {
loop++;
goto search;
}
if (loop == LOOP_ALLOC_CHUNK) {
@ -4438,7 +4500,8 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
ret = do_chunk_alloc(trans, root, num_bytes +
2 * 1024 * 1024, data, 1);
allowed_chunk_alloc = 0;
} else {
done_chunk_alloc = 1;
} else if (!done_chunk_alloc) {
space_info->force_alloc = 1;
}

2
fs/btrfs/extent_map.c
View file

@ -208,7 +208,7 @@ int unpin_extent_cache(struct extent_map_tree *tree, u64 start, u64 len)
write_lock(&tree->lock);
em = lookup_extent_mapping(tree, start, len);
WARN_ON(em->start != start || !em);
WARN_ON(!em || em->start != start);
if (!em)
goto out;

2
fs/btrfs/free-space-cache.c
View file

@ -1296,7 +1296,7 @@ int btrfs_find_space_cluster(struct btrfs_trans_handle *trans,
window_start = entry->offset;
window_free = entry->bytes;
last = entry;
max_extent = 0;
max_extent = entry->bytes;
} else {
last = next;
window_free += next->bytes;

95
fs/btrfs/inode.c
View file

@ -538,7 +538,7 @@ static noinline int submit_compressed_extents(struct inode *inode,
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree;
int ret;
int ret = 0;
if (list_empty(&async_cow->extents))
return 0;
@ -552,6 +552,7 @@ static noinline int submit_compressed_extents(struct inode *inode,
io_tree = &BTRFS_I(inode)->io_tree;
retry:
/* did the compression code fall back to uncompressed IO? */
if (!async_extent->pages) {
int page_started = 0;
@ -562,11 +563,11 @@ static noinline int submit_compressed_extents(struct inode *inode,
async_extent->ram_size - 1, GFP_NOFS);
/* allocate blocks */
cow_file_range(inode, async_cow->locked_page,
async_extent->start,
async_extent->start +
async_extent->ram_size - 1,
&page_started, &nr_written, 0);
ret = cow_file_range(inode, async_cow->locked_page,
async_extent->start,
async_extent->start +
async_extent->ram_size - 1,
&page_started, &nr_written, 0);
/*
* if page_started, cow_file_range inserted an
@ -574,7 +575,7 @@ static noinline int submit_compressed_extents(struct inode *inode,
* and IO for us. Otherwise, we need to submit
* all those pages down to the drive.
*/
if (!page_started)
if (!page_started && !ret)
extent_write_locked_range(io_tree,
inode, async_extent->start,
async_extent->start +
@ -602,7 +603,21 @@ static noinline int submit_compressed_extents(struct inode *inode,
async_extent->compressed_size,
0, alloc_hint,
(u64)-1, &ins, 1);
BUG_ON(ret);
if (ret) {
int i;
for (i = 0; i < async_extent->nr_pages; i++) {
WARN_ON(async_extent->pages[i]->mapping);
page_cache_release(async_extent->pages[i]);
}
kfree(async_extent->pages);
async_extent->nr_pages = 0;
async_extent->pages = NULL;
unlock_extent(io_tree, async_extent->start,
async_extent->start +
async_extent->ram_size - 1, GFP_NOFS);
goto retry;
}
em = alloc_extent_map(GFP_NOFS);
em->start = async_extent->start;
em->len = async_extent->ram_size;
@ -743,8 +758,22 @@ static noinline int cow_file_range(struct inode *inode,
em = search_extent_mapping(&BTRFS_I(inode)->extent_tree,
start, num_bytes);
if (em) {
alloc_hint = em->block_start;
free_extent_map(em);
/*
* if block start isn't an actual block number then find the
* first block in this inode and use that as a hint. If that
* block is also bogus then just don't worry about it.
*/
if (em->block_start >= EXTENT_MAP_LAST_BYTE) {
free_extent_map(em);
em = search_extent_mapping(em_tree, 0, 0);
if (em && em->block_start < EXTENT_MAP_LAST_BYTE)
alloc_hint = em->block_start;
if (em)
free_extent_map(em);
} else {
alloc_hint = em->block_start;
free_extent_map(em);
}
}
read_unlock(&BTRFS_I(inode)->extent_tree.lock);
btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0);
@ -2474,7 +2503,19 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
root = BTRFS_I(dir)->root;
/*
* 5 items for unlink inode
* 1 for orphan
*/
ret = btrfs_reserve_metadata_space(root, 6);
if (ret)
return ret;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_unreserve_metadata_space(root, 6);
return PTR_ERR(trans);
}
btrfs_set_trans_block_group(trans, dir);
@ -2489,6 +2530,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
btrfs_unreserve_metadata_space(root, 6);
btrfs_btree_balance_dirty(root, nr);
return ret;
}
@ -2569,7 +2611,16 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
return -ENOTEMPTY;
ret = btrfs_reserve_metadata_space(root, 5);
if (ret)
return ret;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
btrfs_unreserve_metadata_space(root, 5);
return PTR_ERR(trans);
}
btrfs_set_trans_block_group(trans, dir);
if (unlikely(inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) {
@ -2592,6 +2643,7 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
out:
nr = trans->blocks_used;
ret = btrfs_end_transaction_throttle(trans, root);
btrfs_unreserve_metadata_space(root, 5);
btrfs_btree_balance_dirty(root, nr);
if (ret && !err)
@ -5128,6 +5180,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
ei->logged_trans = 0;
ei->outstanding_extents = 0;
ei->reserved_extents = 0;
ei->root = NULL;
spin_lock_init(&ei->accounting_lock);
btrfs_ordered_inode_tree_init(&ei->ordered_tree);
INIT_LIST_HEAD(&ei->i_orphan);
@ -5143,6 +5196,14 @@ void btrfs_destroy_inode(struct inode *inode)
WARN_ON(!list_empty(&inode->i_dentry));
WARN_ON(inode->i_data.nrpages);
/*
* This can happen where we create an inode, but somebody else also
* created the same inode and we need to destroy the one we already
* created.
*/
if (!root)
goto free;
/*
* Make sure we're properly removed from the ordered operation
* lists.
@ -5178,6 +5239,7 @@ void btrfs_destroy_inode(struct inode *inode)
}
inode_tree_del(inode);
btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
free:
kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
}
@ -5283,11 +5345,14 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
return -ENOTEMPTY;
/*
* 2 items for dir items
* 1 item for orphan entry
* 1 item for ref
* We want to reserve the absolute worst case amount of items. So if
* both inodes are subvols and we need to unlink them then that would
* require 4 item modifications, but if they are both normal inodes it
* would require 5 item modifications, so we'll assume their normal
* inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items
* should cover the worst case number of items we'll modify.
*/
ret = btrfs_reserve_metadata_space(root, 4);
ret = btrfs_reserve_metadata_space(root, 11);
if (ret)
return ret;
@ -5403,7 +5468,7 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
up_read(&root->fs_info->subvol_sem);
btrfs_unreserve_metadata_space(root, 4);
btrfs_unreserve_metadata_space(root, 11);
return ret;
}

2
fs/btrfs/root-tree.c
View file

@ -159,7 +159,6 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
write_extent_buffer(l, item, ptr, sizeof(*item));
btrfs_mark_buffer_dirty(path->nodes[0]);
out:
btrfs_release_path(root, path);
btrfs_free_path(path);
return ret;
}
@ -332,7 +331,6 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
BUG_ON(refs != 0);
ret = btrfs_del_item(trans, root, path);
out:
btrfs_release_path(root, path);
btrfs_free_path(path);
return ret;
}

19
fs/btrfs/transaction.c
View file

@ -163,8 +163,14 @@ static void wait_current_trans(struct btrfs_root *root)
}
}
enum btrfs_trans_type {
TRANS_START,
TRANS_JOIN,
TRANS_USERSPACE,
};
static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
int num_blocks, int wait)
int num_blocks, int type)
{
struct btrfs_trans_handle *h =
kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
@ -172,7 +178,8 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
mutex_lock(&root->fs_info->trans_mutex);
if (!root->fs_info->log_root_recovering &&
((wait == 1 && !root->fs_info->open_ioctl_trans) || wait == 2))
((type == TRANS_START && !root->fs_info->open_ioctl_trans) ||
type == TRANS_USERSPACE))
wait_current_trans(root);
ret = join_transaction(root);
BUG_ON(ret);
@ -186,7 +193,7 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
h->alloc_exclude_start = 0;
h->delayed_ref_updates = 0;
if (!current->journal_info)
if (!current->journal_info && type != TRANS_USERSPACE)
current->journal_info = h;
root->fs_info->running_transaction->use_count++;
@ -198,18 +205,18 @@ static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
int num_blocks)
{
return start_transaction(root, num_blocks, 1);
return start_transaction(root, num_blocks, TRANS_START);
}
struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
int num_blocks)
{
return start_transaction(root, num_blocks, 0);
return start_transaction(root, num_blocks, TRANS_JOIN);
}
struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
int num_blocks)
{
return start_transaction(r, num_blocks, 2);
return start_transaction(r, num_blocks, TRANS_USERSPACE);
}
/* wait for a transaction commit to be fully complete */