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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable

Browse Source 
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable:
  Btrfs: fix data space leak fix
  Btrfs: remove duplicates of filemap_ helpers
  Btrfs: take i_mutex before generic_write_checks
  Btrfs: fix arguments to btrfs_wait_on_page_writeback_range
  Btrfs: fix deadlock with free space handling and user transactions
  Btrfs: fix error cases for ioctl transactions
  Btrfs: Use CONFIG_BTRFS_POSIX_ACL to enable ACL code
  Btrfs: introduce missing kfree
  Btrfs: Fix setting umask when POSIX ACLs are not enabled
  Btrfs: proper -ENOSPC handling
This commit is contained in:
Linus Torvalds 2009-10-01 20:23:15 -07:00
commit 0efe5e32c8
16 changed files with 749 additions and 249 deletions
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6
fs/btrfs/acl.c
View File

@ -27,7 +27,7 @@
#include "btrfs_inode.h"
#include "xattr.h"
#ifdef CONFIG_FS_POSIX_ACL
#ifdef CONFIG_BTRFS_POSIX_ACL
static struct posix_acl *btrfs_get_acl(struct inode *inode, int type)
{
@ -313,7 +313,7 @@ struct xattr_handler btrfs_xattr_acl_access_handler = {
.set = btrfs_xattr_acl_access_set,
};
#else /* CONFIG_FS_POSIX_ACL */
#else /* CONFIG_BTRFS_POSIX_ACL */
int btrfs_acl_chmod(struct inode *inode)
{
@ -325,4 +325,4 @@ int btrfs_init_acl(struct inode *inode, struct inode *dir)
return 0;
}
#endif /* CONFIG_FS_POSIX_ACL */
#endif /* CONFIG_BTRFS_POSIX_ACL */

8
fs/btrfs/btrfs_inode.h
View File

@ -127,6 +127,14 @@ struct btrfs_inode {
*/
u64 last_unlink_trans;
/*
* These two counters are for delalloc metadata reservations. We keep
* track of how many extents we've accounted for vs how many extents we
* have.
*/
int delalloc_reserved_extents;
int delalloc_extents;
/*
* ordered_data_close is set by truncate when a file that used
* to have good data has been truncated to zero. When it is set

25
fs/btrfs/ctree.h
View File

@ -675,18 +675,19 @@ struct btrfs_space_info {
current allocations */
u64 bytes_readonly; /* total bytes that are read only */
u64 bytes_super; /* total bytes reserved for the super blocks */
/* delalloc accounting */
u64 bytes_delalloc; /* number of bytes reserved for allocation,
this space is not necessarily reserved yet
by the allocator */
u64 bytes_root; /* the number of bytes needed to commit a
transaction */
u64 bytes_may_use; /* number of bytes that may be used for
delalloc */
delalloc/allocations */
u64 bytes_delalloc; /* number of bytes currently reserved for
delayed allocation */
int full; /* indicates that we cannot allocate any more
chunks for this space */
int force_alloc; /* set if we need to force a chunk alloc for
this space */
int force_delalloc; /* make people start doing filemap_flush until
we're under a threshold */
struct list_head list;
@ -695,6 +696,9 @@ struct btrfs_space_info {
spinlock_t lock;
struct rw_semaphore groups_sem;
atomic_t caching_threads;
int allocating_chunk;
wait_queue_head_t wait;
};
/*
@ -2022,7 +2026,12 @@ u64 btrfs_reduce_alloc_profile(struct btrfs_root *root, u64 flags);
void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *ionde);
void btrfs_clear_space_info_full(struct btrfs_fs_info *info);
int btrfs_check_metadata_free_space(struct btrfs_root *root);
int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items);
int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items);
int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root,
struct inode *inode, int num_items);
int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root,
struct inode *inode, int num_items);
int btrfs_check_data_free_space(struct btrfs_root *root, struct inode *inode,
u64 bytes);
void btrfs_free_reserved_data_space(struct btrfs_root *root,
@ -2357,7 +2366,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options);
int btrfs_sync_fs(struct super_block *sb, int wait);
/* acl.c */
#ifdef CONFIG_FS_POSIX_ACL
#ifdef CONFIG_BTRFS_POSIX_ACL
int btrfs_check_acl(struct inode *inode, int mask);
#else
#define btrfs_check_acl NULL

10
fs/btrfs/disk-io.c
View File

@ -822,14 +822,14 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
int btrfs_write_tree_block(struct extent_buffer *buf)
{
return btrfs_fdatawrite_range(buf->first_page->mapping, buf->start,
buf->start + buf->len - 1, WB_SYNC_ALL);
return filemap_fdatawrite_range(buf->first_page->mapping, buf->start,
buf->start + buf->len - 1);
}
int btrfs_wait_tree_block_writeback(struct extent_buffer *buf)
{
return btrfs_wait_on_page_writeback_range(buf->first_page->mapping,
buf->start, buf->start + buf->len - 1);
return filemap_fdatawait_range(buf->first_page->mapping,
buf->start, buf->start + buf->len - 1);
}
struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
@ -1630,7 +1630,7 @@ struct btrfs_root *open_ctree(struct super_block *sb,
fs_info->sb = sb;
fs_info->max_extent = (u64)-1;
fs_info->max_inline = 8192 * 1024;
fs_info->metadata_ratio = 8;
fs_info->metadata_ratio = 0;
fs_info->thread_pool_size = min_t(unsigned long,
num_online_cpus() + 2, 8);

397
fs/btrfs/extent-tree.c
View File

@ -68,6 +68,8 @@ static int pin_down_bytes(struct btrfs_trans_handle *trans,
struct extent_buffer **must_clean);
static int find_next_key(struct btrfs_path *path, int level,
struct btrfs_key *key);
static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
int dump_block_groups);
static noinline int
block_group_cache_done(struct btrfs_block_group_cache *cache)
@ -2765,67 +2767,346 @@ void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode)
alloc_target);
}
static u64 calculate_bytes_needed(struct btrfs_root *root, int num_items)
{
u64 num_bytes;
int level;
level = BTRFS_MAX_LEVEL - 2;
/*
* NOTE: these calculations are absolutely the worst possible case.
* This assumes that _every_ item we insert will require a new leaf, and
* that the tree has grown to its maximum level size.
*/
/*
* for every item we insert we could insert both an extent item and a
* extent ref item. Then for ever item we insert, we will need to cow
* both the original leaf, plus the leaf to the left and right of it.
*
* Unless we are talking about the extent root, then we just want the
* number of items * 2, since we just need the extent item plus its ref.
*/
if (root == root->fs_info->extent_root)
num_bytes = num_items * 2;
else
num_bytes = (num_items + (2 * num_items)) * 3;
/*
* num_bytes is total number of leaves we could need times the leaf
* size, and then for every leaf we could end up cow'ing 2 nodes per
* level, down to the leaf level.
*/
num_bytes = (num_bytes * root->leafsize) +
(num_bytes * (level * 2)) * root->nodesize;
return num_bytes;
}
/*
* for now this just makes sure we have at least 5% of our metadata space free
* for use.
* Unreserve metadata space for delalloc. If we have less reserved credits than
* we have extents, this function does nothing.
*/
int btrfs_check_metadata_free_space(struct btrfs_root *root)
int btrfs_unreserve_metadata_for_delalloc(struct btrfs_root *root,
struct inode *inode, int num_items)
{
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_space_info *meta_sinfo;
u64 alloc_target, thresh;
int committed = 0, ret;
u64 num_bytes;
u64 alloc_target;
bool bug = false;
/* get the space info for where the metadata will live */
alloc_target = btrfs_get_alloc_profile(root, 0);
meta_sinfo = __find_space_info(info, alloc_target);
if (!meta_sinfo)
goto alloc;
num_bytes = calculate_bytes_needed(root->fs_info->extent_root,
num_items);
spin_lock(&meta_sinfo->lock);
if (BTRFS_I(inode)->delalloc_reserved_extents <=
BTRFS_I(inode)->delalloc_extents) {
spin_unlock(&meta_sinfo->lock);
return 0;
}
BTRFS_I(inode)->delalloc_reserved_extents--;
BUG_ON(BTRFS_I(inode)->delalloc_reserved_extents < 0);
if (meta_sinfo->bytes_delalloc < num_bytes) {
bug = true;
meta_sinfo->bytes_delalloc = 0;
} else {
meta_sinfo->bytes_delalloc -= num_bytes;
}
spin_unlock(&meta_sinfo->lock);
BUG_ON(bug);
return 0;
}
static void check_force_delalloc(struct btrfs_space_info *meta_sinfo)
{
u64 thresh;
thresh = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
meta_sinfo->bytes_super + meta_sinfo->bytes_root +
meta_sinfo->bytes_may_use;
thresh = meta_sinfo->total_bytes - thresh;
thresh *= 80;
do_div(thresh, 100);
if (thresh <= meta_sinfo->bytes_delalloc)
meta_sinfo->force_delalloc = 1;
else
meta_sinfo->force_delalloc = 0;
}
static int maybe_allocate_chunk(struct btrfs_root *root,
struct btrfs_space_info *info)
{
struct btrfs_super_block *disk_super = &root->fs_info->super_copy;
struct btrfs_trans_handle *trans;
bool wait = false;
int ret = 0;
u64 min_metadata;
u64 free_space;
free_space = btrfs_super_total_bytes(disk_super);
/*
* we allow the metadata to grow to a max of either 5gb or 5% of the
* space in the volume.
*/
min_metadata = min((u64)5 * 1024 * 1024 * 1024,
div64_u64(free_space * 5, 100));
if (info->total_bytes >= min_metadata) {
spin_unlock(&info->lock);
return 0;
}
if (info->full) {
spin_unlock(&info->lock);
return 0;
}
if (!info->allocating_chunk) {
info->force_alloc = 1;
info->allocating_chunk = 1;
init_waitqueue_head(&info->wait);
} else {
wait = true;
}
spin_unlock(&info->lock);
if (wait) {
wait_event(info->wait,
!info->allocating_chunk);
return 1;
}
trans = btrfs_start_transaction(root, 1);
if (!trans) {
ret = -ENOMEM;
goto out;
}
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
4096 + 2 * 1024 * 1024,
info->flags, 0);
btrfs_end_transaction(trans, root);
if (ret)
goto out;
out:
spin_lock(&info->lock);
info->allocating_chunk = 0;
spin_unlock(&info->lock);
wake_up(&info->wait);
if (ret)
return 0;
return 1;
}
/*
* Reserve metadata space for delalloc.
*/
int btrfs_reserve_metadata_for_delalloc(struct btrfs_root *root,
struct inode *inode, int num_items)
{
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_space_info *meta_sinfo;
u64 num_bytes;
u64 used;
u64 alloc_target;
int flushed = 0;
int force_delalloc;
/* get the space info for where the metadata will live */
alloc_target = btrfs_get_alloc_profile(root, 0);
meta_sinfo = __find_space_info(info, alloc_target);
num_bytes = calculate_bytes_needed(root->fs_info->extent_root,
num_items);
again:
spin_lock(&meta_sinfo->lock);
if (!meta_sinfo->full)
thresh = meta_sinfo->total_bytes * 80;
else
thresh = meta_sinfo->total_bytes * 95;
do_div(thresh, 100);
force_delalloc = meta_sinfo->force_delalloc;
if (meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
meta_sinfo->bytes_super > thresh) {
struct btrfs_trans_handle *trans;
if (!meta_sinfo->full) {
meta_sinfo->force_alloc = 1;
if (unlikely(!meta_sinfo->bytes_root))
meta_sinfo->bytes_root = calculate_bytes_needed(root, 6);
if (!flushed)
meta_sinfo->bytes_delalloc += num_bytes;
used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
meta_sinfo->bytes_super + meta_sinfo->bytes_root +
meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc;
if (used > meta_sinfo->total_bytes) {
flushed++;
if (flushed == 1) {
if (maybe_allocate_chunk(root, meta_sinfo))
goto again;
flushed++;
} else {
spin_unlock(&meta_sinfo->lock);
alloc:
trans = btrfs_start_transaction(root, 1);
if (!trans)
return -ENOMEM;
}
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
2 * 1024 * 1024, alloc_target, 0);
btrfs_end_transaction(trans, root);
if (!meta_sinfo) {
meta_sinfo = __find_space_info(info,
alloc_target);
}
if (flushed == 2) {
filemap_flush(inode->i_mapping);
goto again;
} else if (flushed == 3) {
btrfs_start_delalloc_inodes(root);
btrfs_wait_ordered_extents(root, 0);
goto again;
}
spin_lock(&meta_sinfo->lock);
meta_sinfo->bytes_delalloc -= num_bytes;
spin_unlock(&meta_sinfo->lock);
if (!committed) {
committed = 1;
trans = btrfs_join_transaction(root, 1);
if (!trans)
return -ENOMEM;
ret = btrfs_commit_transaction(trans, root);
if (ret)
return ret;
goto again;
}
printk(KERN_ERR "enospc, has %d, reserved %d\n",
BTRFS_I(inode)->delalloc_extents,
BTRFS_I(inode)->delalloc_reserved_extents);
dump_space_info(meta_sinfo, 0, 0);
return -ENOSPC;
}
BTRFS_I(inode)->delalloc_reserved_extents++;
check_force_delalloc(meta_sinfo);
spin_unlock(&meta_sinfo->lock);
if (!flushed && force_delalloc)
filemap_flush(inode->i_mapping);
return 0;
}
/*
* unreserve num_items number of items worth of metadata space. This needs to
* be paired with btrfs_reserve_metadata_space.
*
* NOTE: if you have the option, run this _AFTER_ you do a
* btrfs_end_transaction, since btrfs_end_transaction will run delayed ref
* oprations which will result in more used metadata, so we want to make sure we
* can do that without issue.
*/
int btrfs_unreserve_metadata_space(struct btrfs_root *root, int num_items)
{
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_space_info *meta_sinfo;
u64 num_bytes;
u64 alloc_target;
bool bug = false;
/* get the space info for where the metadata will live */
alloc_target = btrfs_get_alloc_profile(root, 0);
meta_sinfo = __find_space_info(info, alloc_target);
num_bytes = calculate_bytes_needed(root, num_items);
spin_lock(&meta_sinfo->lock);
if (meta_sinfo->bytes_may_use < num_bytes) {
bug = true;
meta_sinfo->bytes_may_use = 0;
} else {
meta_sinfo->bytes_may_use -= num_bytes;
}
spin_unlock(&meta_sinfo->lock);
BUG_ON(bug);
return 0;
}
/*
* Reserve some metadata space for use. We'll calculate the worste case number
* of bytes that would be needed to modify num_items number of items. If we
* have space, fantastic, if not, you get -ENOSPC. Please call
* btrfs_unreserve_metadata_space when you are done for the _SAME_ number of
* items you reserved, since whatever metadata you needed should have already
* been allocated.
*
* This will commit the transaction to make more space if we don't have enough
* metadata space. THe only time we don't do this is if we're reserving space
* inside of a transaction, then we will just return -ENOSPC and it is the
* callers responsibility to handle it properly.
*/
int btrfs_reserve_metadata_space(struct btrfs_root *root, int num_items)
{
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_space_info *meta_sinfo;
u64 num_bytes;
u64 used;
u64 alloc_target;
int retries = 0;
/* get the space info for where the metadata will live */
alloc_target = btrfs_get_alloc_profile(root, 0);
meta_sinfo = __find_space_info(info, alloc_target);
num_bytes = calculate_bytes_needed(root, num_items);
again:
spin_lock(&meta_sinfo->lock);
if (unlikely(!meta_sinfo->bytes_root))
meta_sinfo->bytes_root = calculate_bytes_needed(root, 6);
if (!retries)
meta_sinfo->bytes_may_use += num_bytes;
used = meta_sinfo->bytes_used + meta_sinfo->bytes_reserved +
meta_sinfo->bytes_pinned + meta_sinfo->bytes_readonly +
meta_sinfo->bytes_super + meta_sinfo->bytes_root +
meta_sinfo->bytes_may_use + meta_sinfo->bytes_delalloc;
if (used > meta_sinfo->total_bytes) {
retries++;
if (retries == 1) {
if (maybe_allocate_chunk(root, meta_sinfo))
goto again;
retries++;
} else {
spin_unlock(&meta_sinfo->lock);
}
if (retries == 2) {
btrfs_start_delalloc_inodes(root);
btrfs_wait_ordered_extents(root, 0);
goto again;
}
spin_lock(&meta_sinfo->lock);
meta_sinfo->bytes_may_use -= num_bytes;
spin_unlock(&meta_sinfo->lock);
dump_space_info(meta_sinfo, 0, 0);
return -ENOSPC;
}
check_force_delalloc(meta_sinfo);
spin_unlock(&meta_sinfo->lock);
return 0;
@ -2888,7 +3169,7 @@ alloc:
spin_unlock(&data_sinfo->lock);
/* commit the current transaction and try again */
if (!committed) {
if (!committed && !root->fs_info->open_ioctl_trans) {
committed = 1;
trans = btrfs_join_transaction(root, 1);
if (!trans)
@ -2916,7 +3197,7 @@ alloc:
BTRFS_I(inode)->reserved_bytes += bytes;
spin_unlock(&data_sinfo->lock);
return btrfs_check_metadata_free_space(root);
return 0;
}
/*
@ -3015,17 +3296,15 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
BUG_ON(!space_info);
spin_lock(&space_info->lock);
if (space_info->force_alloc) {
if (space_info->force_alloc)
force = 1;
space_info->force_alloc = 0;
}
if (space_info->full) {
spin_unlock(&space_info->lock);
goto out;
}
thresh = space_info->total_bytes - space_info->bytes_readonly;
thresh = div_factor(thresh, 6);
thresh = div_factor(thresh, 8);
if (!force &&
(space_info->bytes_used + space_info->bytes_pinned +
space_info->bytes_reserved + alloc_bytes) < thresh) {
@ -3039,7 +3318,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
* we keep a reasonable number of metadata chunks allocated in the
* FS as well.
*/
if (flags & BTRFS_BLOCK_GROUP_DATA) {
if (flags & BTRFS_BLOCK_GROUP_DATA && fs_info->metadata_ratio) {
fs_info->data_chunk_allocations++;
if (!(fs_info->data_chunk_allocations %
fs_info->metadata_ratio))
@ -3047,8 +3326,11 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
}
ret = btrfs_alloc_chunk(trans, extent_root, flags);
spin_lock(&space_info->lock);
if (ret)
space_info->full = 1;
space_info->force_alloc = 0;
spin_unlock(&space_info->lock);
out:
mutex_unlock(&extent_root->fs_info->chunk_mutex);
return ret;
@ -4063,21 +4345,32 @@ loop:
return ret;
}
static void dump_space_info(struct btrfs_space_info *info, u64 bytes)
static void dump_space_info(struct btrfs_space_info *info, u64 bytes,
int dump_block_groups)
{
struct btrfs_block_group_cache *cache;
spin_lock(&info->lock);
printk(KERN_INFO "space_info has %llu free, is %sfull\n",
(unsigned long long)(info->total_bytes - info->bytes_used -
info->bytes_pinned - info->bytes_reserved),
info->bytes_pinned - info->bytes_reserved -
info->bytes_super),
(info->full) ? "" : "not ");
printk(KERN_INFO "space_info total=%llu, pinned=%llu, delalloc=%llu,"
" may_use=%llu, used=%llu\n",
" may_use=%llu, used=%llu, root=%llu, super=%llu, reserved=%llu"
"\n",
(unsigned long long)info->total_bytes,
(unsigned long long)info->bytes_pinned,
(unsigned long long)info->bytes_delalloc,
(unsigned long long)info->bytes_may_use,
(unsigned long long)info->bytes_used);
(unsigned long long)info->bytes_used,
(unsigned long long)info->bytes_root,
(unsigned long long)info->bytes_super,
(unsigned long long)info->bytes_reserved);
spin_unlock(&info->lock);
if (!dump_block_groups)
return;
down_read(&info->groups_sem);
list_for_each_entry(cache, &info->block_groups, list) {
@ -4145,7 +4438,7 @@ again:
printk(KERN_ERR "btrfs allocation failed flags %llu, "
"wanted %llu\n", (unsigned long long)data,
(unsigned long long)num_bytes);
dump_space_info(sinfo, num_bytes);
dump_space_info(sinfo, num_bytes, 1);
}
return ret;

92
fs/btrfs/extent_io.c
View File

@ -280,6 +280,14 @@ static struct extent_buffer *buffer_search(struct extent_io_tree *tree,
return NULL;
}
static void merge_cb(struct extent_io_tree *tree, struct extent_state *new,
struct extent_state *other)
{
if (tree->ops && tree->ops->merge_extent_hook)
tree->ops->merge_extent_hook(tree->mapping->host, new,
other);
}
/*
* utility function to look for merge candidates inside a given range.
* Any extents with matching state are merged together into a single
@ -303,6 +311,7 @@ static int merge_state(struct extent_io_tree *tree,
other = rb_entry(other_node, struct extent_state, rb_node);
if (other->end == state->start - 1 &&
other->state == state->state) {
merge_cb(tree, state, other);
state->start = other->start;
other->tree = NULL;
rb_erase(&other->rb_node, &tree->state);
@ -314,33 +323,37 @@ static int merge_state(struct extent_io_tree *tree,
other = rb_entry(other_node, struct extent_state, rb_node);
if (other->start == state->end + 1 &&
other->state == state->state) {
merge_cb(tree, state, other);
other->start = state->start;
state->tree = NULL;
rb_erase(&state->rb_node, &tree->state);
free_extent_state(state);
state = NULL;
}
}
return 0;
}
static void set_state_cb(struct extent_io_tree *tree,
static int set_state_cb(struct extent_io_tree *tree,
struct extent_state *state,
unsigned long bits)
{
if (tree->ops && tree->ops->set_bit_hook) {
tree->ops->set_bit_hook(tree->mapping->host, state->start,
state->end, state->state, bits);
return tree->ops->set_bit_hook(tree->mapping->host,
state->start, state->end,
state->state, bits);
}
return 0;
}
static void clear_state_cb(struct extent_io_tree *tree,
struct extent_state *state,
unsigned long bits)
{
if (tree->ops && tree->ops->clear_bit_hook) {
tree->ops->clear_bit_hook(tree->mapping->host, state->start,
state->end, state->state, bits);
}
if (tree->ops && tree->ops->clear_bit_hook)
tree->ops->clear_bit_hook(tree->mapping->host, state, bits);
}
/*
@ -358,6 +371,7 @@ static int insert_state(struct extent_io_tree *tree,
int bits)
{
struct rb_node *node;
int ret;
if (end < start) {
printk(KERN_ERR "btrfs end < start %llu %llu\n",
@ -365,11 +379,14 @@ static int insert_state(struct extent_io_tree *tree,
(unsigned long long)start);
WARN_ON(1);
}
if (bits & EXTENT_DIRTY)
tree->dirty_bytes += end - start + 1;
state->start = start;
state->end = end;
set_state_cb(tree, state, bits);
ret = set_state_cb(tree, state, bits);
if (ret)
return ret;
if (bits & EXTENT_DIRTY)
tree->dirty_bytes += end - start + 1;
state->state |= bits;
node = tree_insert(&tree->state, end, &state->rb_node);
if (node) {
@ -387,6 +404,15 @@ static int insert_state(struct extent_io_tree *tree,
return 0;
}
static int split_cb(struct extent_io_tree *tree, struct extent_state *orig,
u64 split)
{
if (tree->ops && tree->ops->split_extent_hook)
return tree->ops->split_extent_hook(tree->mapping->host,
orig, split);
return 0;
}
/*
* split a given extent state struct in two, inserting the preallocated
* struct 'prealloc' as the newly created second half. 'split' indicates an
@ -405,6 +431,9 @@ static int split_state(struct extent_io_tree *tree, struct extent_state *orig,
struct extent_state *prealloc, u64 split)
{
struct rb_node *node;
split_cb(tree, orig, split);
prealloc->start = orig->start;
prealloc->end = split - 1;
prealloc->state = orig->state;
@ -542,8 +571,8 @@ hit_next:
if (err)
goto out;
if (state->end <= end) {
set |= clear_state_bit(tree, state, bits,
wake, delete);
set |= clear_state_bit(tree, state, bits, wake,
delete);
if (last_end == (u64)-1)
goto out;
start = last_end + 1;
@ -561,12 +590,11 @@ hit_next:
prealloc = alloc_extent_state(GFP_ATOMIC);
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
if (wake)
wake_up(&state->wq);
set |= clear_state_bit(tree, prealloc, bits,
wake, delete);
set |= clear_state_bit(tree, prealloc, bits, wake, delete);
prealloc = NULL;
goto out;
}
@ -667,16 +695,23 @@ out:
return 0;
}
static void set_state_bits(struct extent_io_tree *tree,
static int set_state_bits(struct extent_io_tree *tree,
struct extent_state *state,
int bits)
{
int ret;
ret = set_state_cb(tree, state, bits);
if (ret)
return ret;
if ((bits & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) {
u64 range = state->end - state->start + 1;
tree->dirty_bytes += range;
}
set_state_cb(tree, state, bits);
state->state |= bits;
return 0;
}
static void cache_state(struct extent_state *state,
@ -758,7 +793,10 @@ hit_next:
goto out;
}
set_state_bits(tree, state, bits);
err = set_state_bits(tree, state, bits);
if (err)
goto out;
cache_state(state, cached_state);
merge_state(tree, state);
if (last_end == (u64)-1)
@ -805,7 +843,9 @@ hit_next:
if (err)
goto out;
if (state->end <= end) {
set_state_bits(tree, state, bits);
err = set_state_bits(tree, state, bits);
if (err)
goto out;
cache_state(state, cached_state);
merge_state(tree, state);
if (last_end == (u64)-1)
@ -829,11 +869,13 @@ hit_next:
this_end = last_start - 1;
err = insert_state(tree, prealloc, start, this_end,
bits);
BUG_ON(err == -EEXIST);
if (err) {
prealloc = NULL;
goto out;
}
cache_state(prealloc, cached_state);
prealloc = NULL;
BUG_ON(err == -EEXIST);
if (err)
goto out;
start = this_end + 1;
goto search_again;
}
@ -852,7 +894,11 @@ hit_next:
err = split_state(tree, state, prealloc, end + 1);
BUG_ON(err == -EEXIST);
set_state_bits(tree, prealloc, bits);
err = set_state_bits(tree, prealloc, bits);
if (err) {
prealloc = NULL;
goto out;
}
cache_state(prealloc, cached_state);
merge_state(tree, prealloc);
prealloc = NULL;

13
fs/btrfs/extent_io.h
View File

@ -60,8 +60,13 @@ struct extent_io_ops {
struct extent_state *state, int uptodate);
int (*set_bit_hook)(struct inode *inode, u64 start, u64 end,
unsigned long old, unsigned long bits);
int (*clear_bit_hook)(struct inode *inode, u64 start, u64 end,
unsigned long old, unsigned long bits);
int (*clear_bit_hook)(struct inode *inode, struct extent_state *state,
unsigned long bits);
int (*merge_extent_hook)(struct inode *inode,
struct extent_state *new,
struct extent_state *other);
int (*split_extent_hook)(struct inode *inode,
struct extent_state *orig, u64 split);
int (*write_cache_pages_lock_hook)(struct page *page);
};
@ -79,10 +84,14 @@ struct extent_state {
u64 start;
u64 end; /* inclusive */
struct rb_node rb_node;
/* ADD NEW ELEMENTS AFTER THIS */
struct extent_io_tree *tree;
wait_queue_head_t wq;
atomic_t refs;
unsigned long state;
u64 split_start;
u64 split_end;
/* for use by the FS */
u64 private;

33
fs/btrfs/file.c
View File

@ -123,7 +123,10 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
end_of_last_block = start_pos + num_bytes - 1;
btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
if (err)
return err;
for (i = 0; i < num_pages; i++) {
struct page *p = pages[i];
SetPageUptodate(p);
@ -917,21 +920,35 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
start_pos = pos;
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
/* do the reserve before the mutex lock in case we have to do some
* flushing. We wouldn't deadlock, but this is more polite.
*/
err = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
if (err)
goto out_nolock;
mutex_lock(&inode->i_mutex);
current->backing_dev_info = inode->i_mapping->backing_dev_info;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
goto out_nolock;
goto out;
if (count == 0)
goto out_nolock;
goto out;
err = file_remove_suid(file);
if (err)
goto out_nolock;
goto out;
file_update_time(file);
pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
mutex_lock(&inode->i_mutex);
/* generic_write_checks can change our pos */
start_pos = pos;
BTRFS_I(inode)->sequence++;
first_index = pos >> PAGE_CACHE_SHIFT;
last_index = (pos + count) >> PAGE_CACHE_SHIFT;
@ -1005,9 +1022,8 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
}
if (will_write) {
btrfs_fdatawrite_range(inode->i_mapping, pos,
pos + write_bytes - 1,
WB_SYNC_ALL);
filemap_fdatawrite_range(inode->i_mapping, pos,
pos + write_bytes - 1);
} else {
balance_dirty_pages_ratelimited_nr(inode->i_mapping,
num_pages);
@ -1028,6 +1044,7 @@ out:
mutex_unlock(&inode->i_mutex);
if (ret)
err = ret;
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
out_nolock:
kfree(pages);

235
fs/btrfs/inode.c
View File

@ -1159,6 +1159,83 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
return ret;
}
static int btrfs_split_extent_hook(struct inode *inode,
struct extent_state *orig, u64 split)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 size;
if (!(orig->state & EXTENT_DELALLOC))
return 0;
size = orig->end - orig->start + 1;
if (size > root->fs_info->max_extent) {
u64 num_extents;
u64 new_size;
new_size = orig->end - split + 1;
num_extents = div64_u64(size + root->fs_info->max_extent - 1,
root->fs_info->max_extent);
/*
* if we break a large extent up then leave delalloc_extents be,
* since we've already accounted for the large extent.
*/
if (div64_u64(new_size + root->fs_info->max_extent - 1,
root->fs_info->max_extent) < num_extents)
return 0;
}
BTRFS_I(inode)->delalloc_extents++;
return 0;
}
/*
* extent_io.c merge_extent_hook, used to track merged delayed allocation
* extents so we can keep track of new extents that are just merged onto old
* extents, such as when we are doing sequential writes, so we can properly
* account for the metadata space we'll need.
*/
static int btrfs_merge_extent_hook(struct inode *inode,
struct extent_state *new,
struct extent_state *other)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 new_size, old_size;
u64 num_extents;
/* not delalloc, ignore it */
if (!(other->state & EXTENT_DELALLOC))
return 0;
old_size = other->end - other->start + 1;
if (new->start < other->start)
new_size = other->end - new->start + 1;
else
new_size = new->end - other->start + 1;
/* we're not bigger than the max, unreserve the space and go */
if (new_size <= root->fs_info->max_extent) {
BTRFS_I(inode)->delalloc_extents--;
return 0;
}
/*
* If we grew by another max_extent, just return, we want to keep that
* reserved amount.
*/
num_extents = div64_u64(old_size + root->fs_info->max_extent - 1,
root->fs_info->max_extent);
if (div64_u64(new_size + root->fs_info->max_extent - 1,
root->fs_info->max_extent) > num_extents)
return 0;
BTRFS_I(inode)->delalloc_extents--;
return 0;
}
/*
* extent_io.c set_bit_hook, used to track delayed allocation
* bytes in this file, and to maintain the list of inodes that
@ -1167,6 +1244,7 @@ static int run_delalloc_range(struct inode *inode, struct page *locked_page,
static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
unsigned long old, unsigned long bits)
{
/*
* set_bit and clear bit hooks normally require _irqsave/restore
* but in this case, we are only testeing for the DELALLOC
@ -1174,6 +1252,8 @@ static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
*/
if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
struct btrfs_root *root = BTRFS_I(inode)->root;
BTRFS_I(inode)->delalloc_extents++;
btrfs_delalloc_reserve_space(root, inode, end - start + 1);
spin_lock(&root->fs_info->delalloc_lock);
BTRFS_I(inode)->delalloc_bytes += end - start + 1;
@ -1190,22 +1270,27 @@ static int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end,
/*
* extent_io.c clear_bit_hook, see set_bit_hook for why
*/
static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
unsigned long old, unsigned long bits)
static int btrfs_clear_bit_hook(struct inode *inode,
struct extent_state *state, unsigned long bits)
{
/*
* set_bit and clear bit hooks normally require _irqsave/restore
* but in this case, we are only testeing for the DELALLOC
* bit, which is only set or cleared with irqs on
*/
if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
if ((state->state & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) {
struct btrfs_root *root = BTRFS_I(inode)->root;
BTRFS_I(inode)->delalloc_extents--;
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
spin_lock(&root->fs_info->delalloc_lock);
if (end - start + 1 > root->fs_info->delalloc_bytes) {
if (state->end - state->start + 1 >
root->fs_info->delalloc_bytes) {
printk(KERN_INFO "btrfs warning: delalloc account "
"%llu %llu\n",
(unsigned long long)end - start + 1,
(unsigned long long)
state->end - state->start + 1,
(unsigned long long)
root->fs_info->delalloc_bytes);
btrfs_delalloc_free_space(root, inode, (u64)-1);
@ -1213,9 +1298,12 @@ static int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end,
BTRFS_I(inode)->delalloc_bytes = 0;
} else {
btrfs_delalloc_free_space(root, inode,
end - start + 1);
root->fs_info->delalloc_bytes -= end - start + 1;
BTRFS_I(inode)->delalloc_bytes -= end - start + 1;
state->end -
state->start + 1);
root->fs_info->delalloc_bytes -= state->end -
state->start + 1;
BTRFS_I(inode)->delalloc_bytes -= state->end -
state->start + 1;
}
if (BTRFS_I(inode)->delalloc_bytes == 0 &&
!list_empty(&BTRFS_I(inode)->delalloc_inodes)) {
@ -2950,7 +3038,12 @@ again:
goto again;
}
btrfs_set_extent_delalloc(inode, page_start, page_end);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
if (ret) {
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
goto out_unlock;
}
ret = 0;
if (offset != PAGE_CACHE_SIZE) {
kaddr = kmap(page);
@ -2981,15 +3074,11 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
u64 last_byte;
u64 cur_offset;
u64 hole_size;
int err;
int err = 0;
if (size <= hole_start)
return 0;
err = btrfs_check_metadata_free_space(root);
if (err)
return err;
btrfs_truncate_page(inode->i_mapping, inode->i_size);
while (1) {
@ -3024,12 +3113,18 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
cur_offset, &hint_byte, 1);
if (err)
break;
err = btrfs_reserve_metadata_space(root, 1);
if (err)
break;
err = btrfs_insert_file_extent(trans, root,
inode->i_ino, cur_offset, 0,
0, hole_size, 0, hole_size,
0, 0, 0);
btrfs_drop_extent_cache(inode, hole_start,
last_byte - 1, 0);
btrfs_unreserve_metadata_space(root, 1);
}
free_extent_map(em);
cur_offset = last_byte;
@ -3990,11 +4085,18 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
if (!new_valid_dev(rdev))
return -EINVAL;
err = btrfs_check_metadata_free_space(root);
/*
* 2 for inode item and ref
* 2 for dir items
* 1 for xattr if selinux is on
*/
err = btrfs_reserve_metadata_space(root, 5);
if (err)
goto fail;
return err;
trans = btrfs_start_transaction(root, 1);
if (!trans)
goto fail;
btrfs_set_trans_block_group(trans, dir);
err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
@ -4032,6 +4134,7 @@ out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
fail:
btrfs_unreserve_metadata_space(root, 5);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
@ -4052,10 +4155,18 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
u64 objectid;
u64 index = 0;
err = btrfs_check_metadata_free_space(root);
/*
* 2 for inode item and ref
* 2 for dir items
* 1 for xattr if selinux is on
*/
err = btrfs_reserve_metadata_space(root, 5);
if (err)
goto fail;
return err;
trans = btrfs_start_transaction(root, 1);
if (!trans)
goto fail;
btrfs_set_trans_block_group(trans, dir);
err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
@ -4096,6 +4207,7 @@ out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
fail:
btrfs_unreserve_metadata_space(root, 5);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
@ -4118,10 +4230,16 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
if (inode->i_nlink == 0)
return -ENOENT;
btrfs_inc_nlink(inode);
err = btrfs_check_metadata_free_space(root);
/*
* 1 item for inode ref
* 2 items for dir items
*/
err = btrfs_reserve_metadata_space(root, 3);
if (err)
goto fail;
return err;
btrfs_inc_nlink(inode);
err = btrfs_set_inode_index(dir, &index);
if (err)
goto fail;
@ -4145,6 +4263,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
fail:
btrfs_unreserve_metadata_space(root, 3);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
@ -4164,17 +4283,21 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
u64 index = 0;
unsigned long nr = 1;
err = btrfs_check_metadata_free_space(root);
/*
* 2 items for inode and ref
* 2 items for dir items
* 1 for xattr if selinux is on
*/
err = btrfs_reserve_metadata_space(root, 5);
if (err)
goto out_unlock;
return err;
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, dir);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
if (!trans) {
err = -ENOMEM;
goto out_unlock;
}
btrfs_set_trans_block_group(trans, dir);
err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
if (err) {
@ -4223,6 +4346,7 @@ out_fail:
btrfs_end_transaction_throttle(trans, root);
out_unlock:
btrfs_unreserve_metadata_space(root, 5);
if (drop_on_err)
iput(inode);
btrfs_btree_balance_dirty(root, nr);
@ -4747,6 +4871,13 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
goto out;
}
ret = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
if (ret) {
btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
ret = VM_FAULT_SIGBUS;
goto out;
}
ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */
again:
lock_page(page);
@ -4778,7 +4909,23 @@ again:
goto again;
}
btrfs_set_extent_delalloc(inode, page_start, page_end);
/*
* XXX - page_mkwrite gets called every time the page is dirtied, even
* if it was already dirty, so for space accounting reasons we need to
* clear any delalloc bits for the range we are fixing to save. There
* is probably a better way to do this, but for now keep consistent with
* prepare_pages in the normal write path.
*/
clear_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end,
EXTENT_DIRTY | EXTENT_DELALLOC, GFP_NOFS);
ret = btrfs_set_extent_delalloc(inode, page_start, page_end);
if (ret) {
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
ret = VM_FAULT_SIGBUS;
btrfs_free_reserved_data_space(root, inode, PAGE_CACHE_SIZE);
goto out_unlock;
}
ret = 0;
/* page is wholly or partially inside EOF */
@ -4801,6 +4948,7 @@ again:
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
out_unlock:
btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
if (!ret)
return VM_FAULT_LOCKED;
unlock_page(page);
@ -4917,6 +5065,8 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
return NULL;
ei->last_trans = 0;
ei->logged_trans = 0;
ei->delalloc_extents = 0;
ei->delalloc_reserved_extents = 0;
btrfs_ordered_inode_tree_init(&ei->ordered_tree);
INIT_LIST_HEAD(&ei->i_orphan);
INIT_LIST_HEAD(&ei->ordered_operations);
@ -5070,7 +5220,12 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
return -ENOTEMPTY;
ret = btrfs_check_metadata_free_space(root);
/*
* 2 items for dir items
* 1 item for orphan entry
* 1 item for ref
*/
ret = btrfs_reserve_metadata_space(root, 4);
if (ret)
return ret;
@ -5185,6 +5340,8 @@ out_fail:
if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
up_read(&root->fs_info->subvol_sem);
btrfs_unreserve_metadata_space(root, 4);
return ret;
}
@ -5256,11 +5413,18 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
return -ENAMETOOLONG;
err = btrfs_check_metadata_free_space(root);
/*
* 2 items for inode item and ref
* 2 items for dir items
* 1 item for xattr if selinux is on
*/
err = btrfs_reserve_metadata_space(root, 5);
if (err)
goto out_fail;
return err;
trans = btrfs_start_transaction(root, 1);
if (!trans)
goto out_fail;
btrfs_set_trans_block_group(trans, dir);
err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
@ -5341,6 +5505,7 @@ out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
out_fail:
btrfs_unreserve_metadata_space(root, 5);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
@ -5362,6 +5527,11 @@ static int prealloc_file_range(struct btrfs_trans_handle *trans,
while (num_bytes > 0) {
alloc_size = min(num_bytes, root->fs_info->max_extent);
ret = btrfs_reserve_metadata_space(root, 1);
if (ret)
goto out;
ret = btrfs_reserve_extent(trans, root, alloc_size,
root->sectorsize, 0, alloc_hint,
(u64)-1, &ins, 1);
@ -5381,6 +5551,7 @@ static int prealloc_file_range(struct btrfs_trans_handle *trans,
num_bytes -= ins.offset;
cur_offset += ins.offset;
alloc_hint = ins.objectid + ins.offset;
btrfs_unreserve_metadata_space(root, 1);
}
out:
if (cur_offset > start) {
@ -5566,6 +5737,8 @@ static struct extent_io_ops btrfs_extent_io_ops = {
.readpage_io_failed_hook = btrfs_io_failed_hook,
.set_bit_hook = btrfs_set_bit_hook,
.clear_bit_hook = btrfs_clear_bit_hook,
.merge_extent_hook = btrfs_merge_extent_hook,
.split_extent_hook = btrfs_split_extent_hook,
};
/*

64
fs/btrfs/ioctl.c
View File

@ -239,7 +239,13 @@ static noinline int create_subvol(struct btrfs_root *root,
u64 index = 0;
unsigned long nr = 1;
ret = btrfs_check_metadata_free_space(root);
/*
* 1 - inode item
* 2 - refs
* 1 - root item
* 2 - dir items
*/
ret = btrfs_reserve_metadata_space(root, 6);
if (ret)
return ret;
@ -340,6 +346,9 @@ fail:
err = btrfs_commit_transaction(trans, root);
if (err && !ret)
ret = err;
btrfs_unreserve_metadata_space(root, 6);
btrfs_btree_balance_dirty(root, nr);
return ret;
}
@ -355,19 +364,27 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
if (!root->ref_cows)
return -EINVAL;
ret = btrfs_check_metadata_free_space(root);
/*
* 1 - inode item
* 2 - refs
* 1 - root item
* 2 - dir items
*/
ret = btrfs_reserve_metadata_space(root, 6);
if (ret)
goto fail_unlock;
pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
if (!pending_snapshot) {
ret = -ENOMEM;
btrfs_unreserve_metadata_space(root, 6);
goto fail_unlock;
}
pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS);
if (!pending_snapshot->name) {
ret = -ENOMEM;
kfree(pending_snapshot);
btrfs_unreserve_metadata_space(root, 6);
goto fail_unlock;
}
memcpy(pending_snapshot->name, name, namelen);
@ -1215,15 +1232,15 @@ static long btrfs_ioctl_trans_start(struct file *file)
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret = 0;
int ret;
ret = -EPERM;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (file->private_data) {
ret = -EINPROGRESS;
goto out;
}
ret = -EINPROGRESS;
if (file->private_data)
goto out;
ret = mnt_want_write(file->f_path.mnt);
if (ret)
@ -1233,12 +1250,19 @@ static long btrfs_ioctl_trans_start(struct file *file)
root->fs_info->open_ioctl_trans++;
mutex_unlock(&root->fs_info->trans_mutex);
ret = -ENOMEM;
trans = btrfs_start_ioctl_transaction(root, 0);
if (trans)
file->private_data = trans;
else
ret = -ENOMEM;
/*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/
if (!trans)
goto out_drop;
file->private_data = trans;
return 0;
out_drop:
mutex_lock(&root->fs_info->trans_mutex);
root->fs_info->open_ioctl_trans--;
mutex_unlock(&root->fs_info->trans_mutex);
mnt_drop_write(file->f_path.mnt);
out:
return ret;
}
@ -1254,24 +1278,20 @@ long btrfs_ioctl_trans_end(struct file *file)
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
int ret = 0;
trans = file->private_data;
if (!trans) {
ret = -EINVAL;
goto out;
}
btrfs_end_transaction(trans, root);
if (!trans)
return -EINVAL;
file->private_data = NULL;
btrfs_end_transaction(trans, root);
mutex_lock(&root->fs_info->trans_mutex);
root->fs_info->open_ioctl_trans--;
mutex_unlock(&root->fs_info->trans_mutex);
mnt_drop_write(file->f_path.mnt);
out:
return ret;
return 0;
}
long btrfs_ioctl(struct file *file, unsigned int

93
fs/btrfs/ordered-data.c
View File

@ -458,7 +458,7 @@ void btrfs_start_ordered_extent(struct inode *inode,
* start IO on any dirty ones so the wait doesn't stall waiting
* for pdflush to find them
*/
btrfs_fdatawrite_range(inode->i_mapping, start, end, WB_SYNC_ALL);
filemap_fdatawrite_range(inode->i_mapping, start, end);
if (wait) {
wait_event(entry->wait, test_bit(BTRFS_ORDERED_COMPLETE,
&entry->flags));
@ -488,17 +488,15 @@ again:
/* start IO across the range first to instantiate any delalloc
* extents
*/
btrfs_fdatawrite_range(inode->i_mapping, start, orig_end, WB_SYNC_ALL);
filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
/* The compression code will leave pages locked but return from
* writepage without setting the page writeback. Starting again
* with WB_SYNC_ALL will end up waiting for the IO to actually start.
*/
btrfs_fdatawrite_range(inode->i_mapping, start, orig_end, WB_SYNC_ALL);
filemap_fdatawrite_range(inode->i_mapping, start, orig_end);
btrfs_wait_on_page_writeback_range(inode->i_mapping,
start >> PAGE_CACHE_SHIFT,
orig_end >> PAGE_CACHE_SHIFT);
filemap_fdatawait_range(inode->i_mapping, start, orig_end);
end = orig_end;
found = 0;
@ -716,89 +714,6 @@ out:
}
/**
* taken from mm/filemap.c because it isn't exported
*
* __filemap_fdatawrite_range - start writeback on mapping dirty pages in range
* @mapping: address space structure to write
* @start: offset in bytes where the range starts
* @end: offset in bytes where the range ends (inclusive)
* @sync_mode: enable synchronous operation
*
* Start writeback against all of a mapping's dirty pages that lie
* within the byte offsets <start, end> inclusive.
*
* If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
* opposed to a regular memory cleansing writeback. The difference between
* these two operations is that if a dirty page/buffer is encountered, it must
* be waited upon, and not just skipped over.
*/
int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
loff_t end, int sync_mode)
{
struct writeback_control wbc = {
.sync_mode = sync_mode,
.nr_to_write = mapping->nrpages * 2,
.range_start = start,
.range_end = end,
};
return btrfs_writepages(mapping, &wbc);
}
/**
* taken from mm/filemap.c because it isn't exported
*
* wait_on_page_writeback_range - wait for writeback to complete
* @mapping: target address_space
* @start: beginning page index
* @end: ending page index
*
* Wait for writeback to complete against pages indexed by start->end
* inclusive
*/
int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
pgoff_t start, pgoff_t end)
{
struct pagevec pvec;
int nr_pages;
int ret = 0;
pgoff_t index;
if (end < start)
return 0;
pagevec_init(&pvec, 0);
index = start;
while ((index <= end) &&
(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
PAGECACHE_TAG_WRITEBACK,
min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1)) != 0) {
unsigned i;
for (i = 0; i < nr_pages; i++) {
struct page *page = pvec.pages[i];
/* until radix tree lookup accepts end_index */
if (page->index > end)
continue;
wait_on_page_writeback(page);
if (PageError(page))
ret = -EIO;
}
pagevec_release(&pvec);
cond_resched();
}
/* Check for outstanding write errors */
if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
ret = -ENOSPC;
if (test_and_clear_bit(AS_EIO, &mapping->flags))
ret = -EIO;
return ret;
}
/*
* add a given inode to the list of inodes that must be fully on
* disk before a transaction commit finishes.

4
fs/btrfs/ordered-data.h
View File

@ -153,10 +153,6 @@ btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
int btrfs_ordered_update_i_size(struct inode *inode,
struct btrfs_ordered_extent *ordered);
int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,
loff_t end, int sync_mode);
int btrfs_wait_ordered_extents(struct btrfs_root *root, int nocow_only);
int btrfs_run_ordered_operations(struct btrfs_root *root, int wait);
int btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,

2
fs/btrfs/super.c
View File

@ -344,7 +344,9 @@ static int btrfs_fill_super(struct super_block *sb,
sb->s_export_op = &btrfs_export_ops;
sb->s_xattr = btrfs_xattr_handlers;
sb->s_time_gran = 1;
#ifdef CONFIG_BTRFS_POSIX_ACL
sb->s_flags |= MS_POSIXACL;
#endif
tree_root = open_ctree(sb, fs_devices, (char *)data);

10
fs/btrfs/transaction.c
View File

@ -186,6 +186,9 @@ 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)
current->journal_info = h;
root->fs_info->running_transaction->use_count++;
record_root_in_trans(h, root);
mutex_unlock(&root->fs_info->trans_mutex);
@ -317,6 +320,9 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
wake_up(&cur_trans->writer_wait);
put_transaction(cur_trans);
mutex_unlock(&info->trans_mutex);
if (current->journal_info == trans)
current->journal_info = NULL;
memset(trans, 0, sizeof(*trans));
kmem_cache_free(btrfs_trans_handle_cachep, trans);
@ -743,6 +749,7 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
memcpy(&pending->root_key, &key, sizeof(key));
fail:
kfree(new_root_item);
btrfs_unreserve_metadata_space(root, 6);
return ret;
}
@ -1059,6 +1066,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
mutex_unlock(&root->fs_info->trans_mutex);
if (current->journal_info == trans)
current->journal_info = NULL;
kmem_cache_free(btrfs_trans_handle_cachep, trans);
return ret;
}

4
fs/btrfs/volumes.c
View File

@ -446,8 +446,10 @@ static struct btrfs_fs_devices *clone_fs_devices(struct btrfs_fs_devices *orig)
goto error;
device->name = kstrdup(orig_dev->name, GFP_NOFS);
if (!device->name)
if (!device->name) {
kfree(device);
goto error;
}
device->devid = orig_dev->devid;
device->work.func = pending_bios_fn;

2
fs/btrfs/xattr.c
View File

@ -260,7 +260,7 @@ err:
* attributes are handled directly.
*/
struct xattr_handler *btrfs_xattr_handlers[] = {
#ifdef CONFIG_FS_POSIX_ACL
#ifdef CONFIG_BTRFS_POSIX_ACL
&btrfs_xattr_acl_access_handler,
&btrfs_xattr_acl_default_handler,
#endif