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

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* 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
parent 404291ac9e a6dbd429d8
commit aa021baa32
6 changed files with 183 additions and 50 deletions
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113
fs/btrfs/extent-tree.c
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@@ -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 @@ search:
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 @@ loop:
}
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 @@ loop:
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 @@ loop:
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;
}