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Btrfs: Integrate metadata reservation with start_transaction 

Besides simplify the code, this change makes sure all metadata
reservation for normal metadata operations are released after
committing transaction.

Changes since V1:

Add code that check if unlink and rmdir will free space.

Add ENOSPC handling for clone ioctl.

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Yan, Zheng 2010-05-16 10:48:46 -04:00 committed by Chris Mason
parent f0486c68e4
commit a22285a6a3
15 changed files with 685 additions and 535 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
fs/btrfs/ctree.h
View File

@ -34,6 +34,7 @@
struct btrfs_trans_handle;
struct btrfs_transaction;
struct btrfs_pending_snapshot;
extern struct kmem_cache *btrfs_trans_handle_cachep;
extern struct kmem_cache *btrfs_transaction_cachep;
extern struct kmem_cache *btrfs_bit_radix_cachep;
@ -970,6 +971,7 @@ struct btrfs_fs_info {
int do_barriers;
int closing;
int log_root_recovering;
int enospc_unlink;
u64 total_pinned;
@ -1995,6 +1997,9 @@ void btrfs_put_block_group(struct btrfs_block_group_cache *cache);
int btrfs_run_delayed_refs(struct btrfs_trans_handle *trans,
struct btrfs_root *root, unsigned long count);
int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len);
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 *refs, u64 *flags);
int btrfs_pin_extent(struct btrfs_root *root,
u64 bytenr, u64 num, int reserved);
int btrfs_drop_leaf_ref(struct btrfs_trans_handle *trans,
@ -2075,8 +2080,6 @@ 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_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,
@ -2089,6 +2092,13 @@ void btrfs_delalloc_reserve_space(struct btrfs_root *root, struct inode *inode,
u64 bytes);
void btrfs_delalloc_free_space(struct btrfs_root *root, struct inode *inode,
u64 bytes);
int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
int num_items, int *retries);
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending);
void btrfs_init_block_rsv(struct btrfs_block_rsv *rsv);
struct btrfs_block_rsv *btrfs_alloc_block_rsv(struct btrfs_root *root);
void btrfs_free_block_rsv(struct btrfs_root *root,
@ -2296,6 +2306,12 @@ int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
const char *name, int name_len,
u64 inode_objectid, u64 ref_objectid, u64 *index);
struct btrfs_inode_ref *
btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
const char *name, int name_len,
u64 inode_objectid, u64 ref_objectid, int mod);
int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path, u64 objectid);

101
fs/btrfs/delayed-ref.c
View File

@ -318,107 +318,6 @@ out:
return ret;
}
/*
* helper function to lookup reference count and flags of extent.
*
* the head node for delayed ref is used to store the sum of all the
* reference count modifications queued up in the rbtree. the head
* node may also store the extent flags to set. This way you can check
* to see what the reference count and extent flags would be if all of
* the delayed refs are not processed.
*/
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 *refs, u64 *flags)
{
struct btrfs_delayed_ref_node *ref;
struct btrfs_delayed_ref_head *head;
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_path *path;
struct btrfs_extent_item *ei;
struct extent_buffer *leaf;
struct btrfs_key key;
u32 item_size;
u64 num_refs;
u64 extent_flags;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = num_bytes;
delayed_refs = &trans->transaction->delayed_refs;
again:
ret = btrfs_search_slot(trans, root->fs_info->extent_root,
&key, path, 0, 0);
if (ret < 0)
goto out;
if (ret == 0) {
leaf = path->nodes[0];
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
if (item_size >= sizeof(*ei)) {
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item);
num_refs = btrfs_extent_refs(leaf, ei);
extent_flags = btrfs_extent_flags(leaf, ei);
} else {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
struct btrfs_extent_item_v0 *ei0;
BUG_ON(item_size != sizeof(*ei0));
ei0 = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item_v0);
num_refs = btrfs_extent_refs_v0(leaf, ei0);
/* FIXME: this isn't correct for data */
extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF;
#else
BUG();
#endif
}
BUG_ON(num_refs == 0);
} else {
num_refs = 0;
extent_flags = 0;
ret = 0;
}
spin_lock(&delayed_refs->lock);
ref = find_ref_head(&delayed_refs->root, bytenr, NULL);
if (ref) {
head = btrfs_delayed_node_to_head(ref);
if (!mutex_trylock(&head->mutex)) {
atomic_inc(&ref->refs);
spin_unlock(&delayed_refs->lock);
btrfs_release_path(root->fs_info->extent_root, path);
mutex_lock(&head->mutex);
mutex_unlock(&head->mutex);
btrfs_put_delayed_ref(ref);
goto again;
}
if (head->extent_op && head->extent_op->update_flags)
extent_flags |= head->extent_op->flags_to_set;
else
BUG_ON(num_refs == 0);
num_refs += ref->ref_mod;
mutex_unlock(&head->mutex);
}
WARN_ON(num_refs == 0);
if (refs)
*refs = num_refs;
if (flags)
*flags = extent_flags;
out:
spin_unlock(&delayed_refs->lock);
btrfs_free_path(path);
return ret;
}
/*
* helper function to update an extent delayed ref in the
* rbtree. existing and update must both have the same

3
fs/btrfs/delayed-ref.h
View File

@ -167,9 +167,6 @@ int btrfs_add_delayed_extent_op(struct btrfs_trans_handle *trans,
struct btrfs_delayed_ref_head *
btrfs_find_delayed_ref_head(struct btrfs_trans_handle *trans, u64 bytenr);
int btrfs_delayed_ref_pending(struct btrfs_trans_handle *trans, u64 bytenr);
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 *refs, u64 *flags);
int btrfs_update_delayed_ref(struct btrfs_trans_handle *trans,
u64 bytenr, u64 num_bytes, u64 orig_parent,
u64 parent, u64 orig_ref_root, u64 ref_root,

6
fs/btrfs/disk-io.c
View File

@ -1522,7 +1522,7 @@ static int transaction_kthread(void *arg)
goto sleep;
}
mutex_unlock(&root->fs_info->trans_mutex);
trans = btrfs_start_transaction(root, 1);
trans = btrfs_join_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
sleep:
@ -2409,11 +2409,11 @@ int btrfs_commit_super(struct btrfs_root *root)
down_write(&root->fs_info->cleanup_work_sem);
up_write(&root->fs_info->cleanup_work_sem);
trans = btrfs_start_transaction(root, 1);
trans = btrfs_join_transaction(root, 1);
ret = btrfs_commit_transaction(trans, root);
BUG_ON(ret);
/* run commit again to drop the original snapshot */
trans = btrfs_start_transaction(root, 1);
trans = btrfs_join_transaction(root, 1);
btrfs_commit_transaction(trans, root);
ret = btrfs_write_and_wait_transaction(NULL, root);
BUG_ON(ret);

283
fs/btrfs/extent-tree.c
View File

@ -615,6 +615,113 @@ int btrfs_lookup_extent(struct btrfs_root *root, u64 start, u64 len)
return ret;
}
/*
* helper function to lookup reference count and flags of extent.
*
* the head node for delayed ref is used to store the sum of all the
* reference count modifications queued up in the rbtree. the head
* node may also store the extent flags to set. This way you can check
* to see what the reference count and extent flags would be if all of
* the delayed refs are not processed.
*/
int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
u64 num_bytes, u64 *refs, u64 *flags)
{
struct btrfs_delayed_ref_head *head;
struct btrfs_delayed_ref_root *delayed_refs;
struct btrfs_path *path;
struct btrfs_extent_item *ei;
struct extent_buffer *leaf;
struct btrfs_key key;
u32 item_size;
u64 num_refs;
u64 extent_flags;
int ret;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
key.objectid = bytenr;
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = num_bytes;
if (!trans) {
path->skip_locking = 1;
path->search_commit_root = 1;
}
again:
ret = btrfs_search_slot(trans, root->fs_info->extent_root,
&key, path, 0, 0);
if (ret < 0)
goto out_free;
if (ret == 0) {
leaf = path->nodes[0];
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
if (item_size >= sizeof(*ei)) {
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item);
num_refs = btrfs_extent_refs(leaf, ei);
extent_flags = btrfs_extent_flags(leaf, ei);
} else {
#ifdef BTRFS_COMPAT_EXTENT_TREE_V0
struct btrfs_extent_item_v0 *ei0;
BUG_ON(item_size != sizeof(*ei0));
ei0 = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_extent_item_v0);
num_refs = btrfs_extent_refs_v0(leaf, ei0);
/* FIXME: this isn't correct for data */
extent_flags = BTRFS_BLOCK_FLAG_FULL_BACKREF;
#else
BUG();
#endif
}
BUG_ON(num_refs == 0);
} else {
num_refs = 0;
extent_flags = 0;
ret = 0;
}
if (!trans)
goto out;
delayed_refs = &trans->transaction->delayed_refs;
spin_lock(&delayed_refs->lock);
head = btrfs_find_delayed_ref_head(trans, bytenr);
if (head) {
if (!mutex_trylock(&head->mutex)) {
atomic_inc(&head->node.refs);
spin_unlock(&delayed_refs->lock);
btrfs_release_path(root->fs_info->extent_root, path);
mutex_lock(&head->mutex);
mutex_unlock(&head->mutex);
btrfs_put_delayed_ref(&head->node);
goto again;
}
if (head->extent_op && head->extent_op->update_flags)
extent_flags |= head->extent_op->flags_to_set;
else
BUG_ON(num_refs == 0);
num_refs += head->node.ref_mod;
mutex_unlock(&head->mutex);
}
spin_unlock(&delayed_refs->lock);
out:
WARN_ON(num_refs == 0);
if (refs)
*refs = num_refs;
if (flags)
*flags = extent_flags;
out_free:
btrfs_free_path(path);
return ret;
}
/*
* Back reference rules. Back refs have three main goals:
*
@ -2948,113 +3055,6 @@ again:
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(NULL, root, meta_sinfo,
num_bytes))
goto again;
retries++;
} else {
spin_unlock(&meta_sinfo->lock);
}
if (retries == 2) {
shrink_delalloc(NULL, root, meta_sinfo, num_bytes);
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;
}
/*
* This will check the space that the inode allocates from to make sure we have
* enough space for bytes.
@ -3095,9 +3095,9 @@ again:
spin_unlock(&data_sinfo->lock);
alloc:
alloc_target = btrfs_get_alloc_profile(root, 1);
trans = btrfs_start_transaction(root, 1);
if (!trans)
return -ENOMEM;
trans = btrfs_join_transaction(root, 1);
if (IS_ERR(trans))
return PTR_ERR(trans);
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
bytes + 2 * 1024 * 1024,
@ -3118,8 +3118,8 @@ alloc:
if (!committed && !root->fs_info->open_ioctl_trans) {
committed = 1;
trans = btrfs_join_transaction(root, 1);
if (!trans)
return -ENOMEM;
if (IS_ERR(trans))
return PTR_ERR(trans);
ret = btrfs_commit_transaction(trans, root);
if (ret)
return ret;
@ -3701,6 +3701,59 @@ static void init_global_block_rsv(struct btrfs_fs_info *fs_info)
fs_info->chunk_root->block_rsv = &fs_info->chunk_block_rsv;
}
static u64 calc_trans_metadata_size(struct btrfs_root *root, int num_items)
{
return (root->leafsize + root->nodesize * (BTRFS_MAX_LEVEL - 1)) *
3 * num_items;
}
int btrfs_trans_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
int num_items, int *retries)
{
u64 num_bytes;
int ret;
if (num_items == 0 || root->fs_info->chunk_root == root)
return 0;
num_bytes = calc_trans_metadata_size(root, num_items);
ret = btrfs_block_rsv_add(trans, root, &root->fs_info->trans_block_rsv,
num_bytes, retries);
if (!ret) {
trans->bytes_reserved += num_bytes;
trans->block_rsv = &root->fs_info->trans_block_rsv;
}
return ret;
}
void btrfs_trans_release_metadata(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
if (!trans->bytes_reserved)
return;
BUG_ON(trans->block_rsv != &root->fs_info->trans_block_rsv);
btrfs_block_rsv_release(root, trans->block_rsv,
trans->bytes_reserved);
trans->bytes_reserved = 0;
}
int btrfs_snap_reserve_metadata(struct btrfs_trans_handle *trans,
struct btrfs_pending_snapshot *pending)
{
struct btrfs_root *root = pending->root;
struct btrfs_block_rsv *src_rsv = get_block_rsv(trans, root);
struct btrfs_block_rsv *dst_rsv = &pending->block_rsv;
/*
* two for root back/forward refs, two for directory entries
* and one for root of the snapshot.
*/
u64 num_bytes = calc_trans_metadata_size(root, 5);
dst_rsv->space_info = src_rsv->space_info;
return block_rsv_migrate_bytes(src_rsv, dst_rsv, num_bytes);
}
static int update_block_group(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes, int alloc)
@ -5824,7 +5877,7 @@ int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref)
wc = kzalloc(sizeof(*wc), GFP_NOFS);
BUG_ON(!wc);
trans = btrfs_start_transaction(tree_root, 1);
trans = btrfs_start_transaction(tree_root, 0);
if (btrfs_disk_key_objectid(&root_item->drop_progress) == 0) {
level = btrfs_header_level(root->node);
@ -5920,7 +5973,9 @@ int btrfs_drop_snapshot(struct btrfs_root *root, int update_ref)
BUG_ON(ret);
btrfs_end_transaction(trans, tree_root);
trans = btrfs_start_transaction(tree_root, 1);
trans = btrfs_start_transaction(tree_root, 0);
if (IS_ERR(trans))
return PTR_ERR(trans);
} else {
unsigned long update;
update = trans->delayed_ref_updates;

13
fs/btrfs/file.c
View File

@ -126,8 +126,7 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
end_of_last_block = start_pos + num_bytes - 1;
err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block,
NULL);
if (err)
return err;
BUG_ON(err);
for (i = 0; i < num_pages; i++) {
struct page *p = pages[i];
@ -142,7 +141,7 @@ static noinline int dirty_and_release_pages(struct btrfs_trans_handle *trans,
* at this time.
*/
}
return err;
return 0;
}
/*
@ -1008,7 +1007,7 @@ out_nolock:
num_written = err;
if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
ret = btrfs_log_dentry_safe(trans, root,
file->f_dentry);
if (ret == 0) {
@ -1104,9 +1103,9 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync)
if (file && file->private_data)
btrfs_ioctl_trans_end(file);
trans = btrfs_start_transaction(root, 1);
if (!trans) {
ret = -ENOMEM;
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}

27
fs/btrfs/inode-item.c
View File

@ -49,6 +49,33 @@ static int find_name_in_backref(struct btrfs_path *path, const char *name,
return 0;
}
struct btrfs_inode_ref *
btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
const char *name, int name_len,
u64 inode_objectid, u64 ref_objectid, int mod)
{
struct btrfs_key key;
struct btrfs_inode_ref *ref;
int ins_len = mod < 0 ? -1 : 0;
int cow = mod != 0;
int ret;
key.objectid = inode_objectid;
key.type = BTRFS_INODE_REF_KEY;
key.offset = ref_objectid;
ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
if (ret < 0)
return ERR_PTR(ret);
if (ret > 0)
return NULL;
if (!find_name_in_backref(path, name, name_len, &ref))
return NULL;
return ref;
}
int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
const char *name, int name_len,

405
fs/btrfs/inode.c
View File

@ -2135,7 +2135,7 @@ void btrfs_orphan_cleanup(struct btrfs_root *root)
* do a destroy_inode
*/
if (is_bad_inode(inode)) {
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
btrfs_orphan_del(trans, inode);
btrfs_end_transaction(trans, root);
iput(inode);
@ -2478,29 +2478,201 @@ out:
return ret;
}
/* helper to check if there is any shared block in the path */
static int check_path_shared(struct btrfs_root *root,
struct btrfs_path *path)
{
struct extent_buffer *eb;
int level;
int ret;
u64 refs;
for (level = 0; level < BTRFS_MAX_LEVEL; level++) {
if (!path->nodes[level])
break;
eb = path->nodes[level];
if (!btrfs_block_can_be_shared(root, eb))
continue;
ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len,
&refs, NULL);
if (refs > 1)
return 1;
}
return 0;
}
/*
* helper to start transaction for unlink and rmdir.
*
* unlink and rmdir are special in btrfs, they do not always free space.
* so in enospc case, we should make sure they will free space before
* allowing them to use the global metadata reservation.
*/
static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir,
struct dentry *dentry)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_path *path;
struct btrfs_inode_ref *ref;
struct btrfs_dir_item *di;
struct inode *inode = dentry->d_inode;
u64 index;
int check_link = 1;
int err = -ENOSPC;
int ret;
trans = btrfs_start_transaction(root, 10);
if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC)
return trans;
if (inode->i_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)
return ERR_PTR(-ENOSPC);
/* check if there is someone else holds reference */
if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1)
return ERR_PTR(-ENOSPC);
if (atomic_read(&inode->i_count) > 2)
return ERR_PTR(-ENOSPC);
if (xchg(&root->fs_info->enospc_unlink, 1))
return ERR_PTR(-ENOSPC);
path = btrfs_alloc_path();
if (!path) {
root->fs_info->enospc_unlink = 0;
return ERR_PTR(-ENOMEM);
}
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
btrfs_free_path(path);
root->fs_info->enospc_unlink = 0;
return trans;
}
path->skip_locking = 1;
path->search_commit_root = 1;
ret = btrfs_lookup_inode(trans, root, path,
&BTRFS_I(dir)->location, 0);
if (ret < 0) {
err = ret;
goto out;
}
if (ret == 0) {
if (check_path_shared(root, path))
goto out;
} else {
check_link = 0;
}
btrfs_release_path(root, path);
ret = btrfs_lookup_inode(trans, root, path,
&BTRFS_I(inode)->location, 0);
if (ret < 0) {
err = ret;
goto out;
}
if (ret == 0) {
if (check_path_shared(root, path))
goto out;
} else {
check_link = 0;
}
btrfs_release_path(root, path);
if (ret == 0 && S_ISREG(inode->i_mode)) {
ret = btrfs_lookup_file_extent(trans, root, path,
inode->i_ino, (u64)-1, 0);
if (ret < 0) {
err = ret;
goto out;
}
BUG_ON(ret == 0);
if (check_path_shared(root, path))
goto out;
btrfs_release_path(root, path);
}
if (!check_link) {
err = 0;
goto out;
}
di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
dentry->d_name.name, dentry->d_name.len, 0);
if (IS_ERR(di)) {
err = PTR_ERR(di);
goto out;
}
if (di) {
if (check_path_shared(root, path))
goto out;
} else {
err = 0;
goto out;
}
btrfs_release_path(root, path);
ref = btrfs_lookup_inode_ref(trans, root, path,
dentry->d_name.name, dentry->d_name.len,
inode->i_ino, dir->i_ino, 0);
if (IS_ERR(ref)) {
err = PTR_ERR(ref);
goto out;
}
BUG_ON(!ref);
if (check_path_shared(root, path))
goto out;
index = btrfs_inode_ref_index(path->nodes[0], ref);
btrfs_release_path(root, path);
di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, index,
dentry->d_name.name, dentry->d_name.len, 0);
if (IS_ERR(di)) {
err = PTR_ERR(di);
goto out;
}
BUG_ON(ret == -ENOENT);
if (check_path_shared(root, path))
goto out;
err = 0;
out:
btrfs_free_path(path);
if (err) {
btrfs_end_transaction(trans, root);
root->fs_info->enospc_unlink = 0;
return ERR_PTR(err);
}
trans->block_rsv = &root->fs_info->global_block_rsv;
return trans;
}
static void __unlink_end_trans(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
if (trans->block_rsv == &root->fs_info->global_block_rsv) {
BUG_ON(!root->fs_info->enospc_unlink);
root->fs_info->enospc_unlink = 0;
}
btrfs_end_transaction_throttle(trans, root);
}
static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
{
struct btrfs_root *root;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_trans_handle *trans;
struct inode *inode = dentry->d_inode;
int ret;
unsigned long nr = 0;
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);
trans = __unlink_start_trans(dir, dentry);
if (IS_ERR(trans))
return PTR_ERR(trans);
}
btrfs_set_trans_block_group(trans, dir);
@ -2508,14 +2680,15 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode,
dentry->d_name.name, dentry->d_name.len);
BUG_ON(ret);
if (inode->i_nlink == 0)
if (inode->i_nlink == 0) {
ret = btrfs_orphan_add(trans, inode);
BUG_ON(ret);
}
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
btrfs_unreserve_metadata_space(root, 6);
__unlink_end_trans(trans, root);
btrfs_btree_balance_dirty(root, nr);
return ret;
}
@ -2587,7 +2760,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
{
struct inode *inode = dentry->d_inode;
int err = 0;
int ret;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_trans_handle *trans;
unsigned long nr = 0;
@ -2596,15 +2768,9 @@ 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);
trans = __unlink_start_trans(dir, dentry);
if (IS_ERR(trans))
return PTR_ERR(trans);
}
btrfs_set_trans_block_group(trans, dir);
@ -2627,12 +2793,9 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
btrfs_i_size_write(inode, 0);
out:
nr = trans->blocks_used;
ret = btrfs_end_transaction_throttle(trans, root);
btrfs_unreserve_metadata_space(root, 5);
__unlink_end_trans(trans, root);
btrfs_btree_balance_dirty(root, nr);
if (ret && !err)
err = ret;
return err;
}
@ -3145,7 +3308,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_map *em;
struct extent_map *em = NULL;
struct extent_state *cached_state = NULL;
u64 mask = root->sectorsize - 1;
u64 hole_start = (inode->i_size + mask) & ~mask;
@ -3183,11 +3346,11 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
u64 hint_byte = 0;
hole_size = last_byte - cur_offset;
err = btrfs_reserve_metadata_space(root, 2);
if (err)
trans = btrfs_start_transaction(root, 2);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
break;
trans = btrfs_start_transaction(root, 1);
}
btrfs_set_trans_block_group(trans, inode);
err = btrfs_drop_extents(trans, inode, cur_offset,
@ -3205,14 +3368,15 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
last_byte - 1, 0);
btrfs_end_transaction(trans, root);
btrfs_unreserve_metadata_space(root, 2);
}
free_extent_map(em);
em = NULL;
cur_offset = last_byte;
if (cur_offset >= block_end)
break;
}
free_extent_map(em);
unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state,
GFP_NOFS);
return err;
@ -3239,10 +3403,6 @@ static int btrfs_setattr_size(struct inode *inode, struct iattr *attr)
}
}
ret = btrfs_reserve_metadata_space(root, 1);
if (ret)
return ret;
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
@ -3251,7 +3411,6 @@ static int btrfs_setattr_size(struct inode *inode, struct iattr *attr)
nr = trans->blocks_used;
btrfs_end_transaction(trans, root);
btrfs_unreserve_metadata_space(root, 1);
btrfs_btree_balance_dirty(root, nr);
if (attr->ia_size > inode->i_size) {
@ -4223,26 +4382,21 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
if (!new_valid_dev(rdev))
return -EINVAL;
err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
if (err)
return err;
/*
* 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)
return err;
trans = btrfs_start_transaction(root, 5);
if (IS_ERR(trans))
return PTR_ERR(trans);
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);
if (err) {
err = -ENOSPC;
goto out_unlock;
}
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino, objectid,
@ -4271,13 +4425,11 @@ static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
out_unlock:
nr = trans->blocks_used;
btrfs_end_transaction_throttle(trans, root);
fail:
btrfs_unreserve_metadata_space(root, 5);
btrfs_btree_balance_dirty(root, nr);
if (drop_inode) {
inode_dec_link_count(inode);
iput(inode);
}
btrfs_btree_balance_dirty(root, nr);
return err;
}
@ -4287,32 +4439,26 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct inode *inode = NULL;
int err;
int drop_inode = 0;
int err;
unsigned long nr = 0;
u64 objectid;
u64 index = 0;
err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
if (err)
return err;
/*
* 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)
return err;
trans = btrfs_start_transaction(root, 5);
if (IS_ERR(trans))
return PTR_ERR(trans);
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);
if (err) {
err = -ENOSPC;
goto out_unlock;
}
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino,
@ -4344,8 +4490,6 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
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);
@ -4372,21 +4516,21 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
if (root->objectid != BTRFS_I(inode)->root->objectid)
return -EPERM;
/*
* 1 item for inode ref
* 2 items for dir items
*/
err = btrfs_reserve_metadata_space(root, 3);
if (err)
return err;
btrfs_inc_nlink(inode);
err = btrfs_set_inode_index(dir, &index);
if (err)
goto fail;
trans = btrfs_start_transaction(root, 1);
/*
* 1 item for inode ref
* 2 items for dir items
*/
trans = btrfs_start_transaction(root, 3);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto fail;
}
btrfs_set_trans_block_group(trans, dir);
atomic_inc(&inode->i_count);
@ -4405,7 +4549,6 @@ 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);
@ -4425,28 +4568,20 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
u64 index = 0;
unsigned long nr = 1;
err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
if (err)
return err;
/*
* 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)
return err;
trans = btrfs_start_transaction(root, 1);
if (!trans) {
err = -ENOMEM;
goto out_unlock;
}
trans = btrfs_start_transaction(root, 5);
if (IS_ERR(trans))
return PTR_ERR(trans);
btrfs_set_trans_block_group(trans, dir);
err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
if (err) {
err = -ENOSPC;
goto out_fail;
}
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino, objectid,
@ -4486,9 +4621,6 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
out_fail:
nr = trans->blocks_used;
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);
@ -5426,19 +5558,6 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
if (S_ISDIR(old_inode->i_mode) && new_inode &&
new_inode->i_size > BTRFS_EMPTY_DIR_SIZE)
return -ENOTEMPTY;
/*
* 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, 11);
if (ret)
return ret;
/*
* we're using rename to replace one file with another.
* and the replacement file is large. Start IO on it now so
@ -5451,8 +5570,18 @@ static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry,
/* close the racy window with snapshot create/destroy ioctl */
if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
down_read(&root->fs_info->subvol_sem);
/*
* 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.
*/
trans = btrfs_start_transaction(root, 20);
if (IS_ERR(trans))
return PTR_ERR(trans);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, new_dir);
if (dest != root)
@ -5551,7 +5680,6 @@ out_fail:
if (old_inode->i_ino == BTRFS_FIRST_FREE_OBJECTID)
up_read(&root->fs_info->subvol_sem);
btrfs_unreserve_metadata_space(root, 11);
return ret;
}
@ -5658,26 +5786,20 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
return -ENAMETOOLONG;
err = btrfs_find_free_objectid(NULL, root, dir->i_ino, &objectid);
if (err)
return err;
/*
* 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)
return err;
trans = btrfs_start_transaction(root, 5);
if (IS_ERR(trans))
return PTR_ERR(trans);
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);
if (err) {
err = -ENOSPC;
goto out_unlock;
}
inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name,
dentry->d_name.len,
dentry->d_parent->d_inode->i_ino, objectid,
@ -5749,8 +5871,6 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
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);
@ -5771,21 +5891,18 @@ static int prealloc_file_range(struct inode *inode, u64 start, u64 end,
u64 i_size;
while (num_bytes > 0) {
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 3);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
break;
}
ret = btrfs_reserve_extent(trans, root, num_bytes,
root->sectorsize, 0, alloc_hint,
(u64)-1, &ins, 1);
if (ret) {
WARN_ON(1);
goto stop_trans;
}
ret = btrfs_reserve_metadata_space(root, 3);
if (ret) {
btrfs_free_reserved_extent(root, ins.objectid,
ins.offset);
goto stop_trans;
btrfs_end_transaction(trans, root);
break;
}
ret = insert_reserved_file_extent(trans, inode,
@ -5819,14 +5936,8 @@ static int prealloc_file_range(struct inode *inode, u64 start, u64 end,
BUG_ON(ret);
btrfs_end_transaction(trans, root);
btrfs_unreserve_metadata_space(root, 3);
}
return ret;
stop_trans:
btrfs_end_transaction(trans, root);
return ret;
}
static long btrfs_fallocate(struct inode *inode, int mode,

163
fs/btrfs/ioctl.c
View File

@ -239,23 +239,19 @@ static noinline int create_subvol(struct btrfs_root *root,
u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
u64 index = 0;
ret = btrfs_find_free_objectid(NULL, root->fs_info->tree_root,
0, &objectid);
if (ret)
return ret;
/*
* 1 - inode item
* 2 - refs
* 1 - root item
* 2 - dir items
*/
ret = btrfs_reserve_metadata_space(root, 6);
if (ret)
return ret;
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
0, &objectid);
if (ret)
goto fail;
trans = btrfs_start_transaction(root, 6);
if (IS_ERR(trans))
return PTR_ERR(trans);
leaf = btrfs_alloc_free_block(trans, root, root->leafsize,
0, objectid, NULL, 0, 0, 0);
@ -345,13 +341,10 @@ fail:
err = btrfs_commit_transaction(trans, root);
if (err && !ret)
ret = err;
btrfs_unreserve_metadata_space(root, 6);
return ret;
}
static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
char *name, int namelen)
static int create_snapshot(struct btrfs_root *root, struct dentry *dentry)
{
struct inode *inode;
struct btrfs_pending_snapshot *pending_snapshot;
@ -361,40 +354,33 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
if (!root->ref_cows)
return -EINVAL;
/*
* 1 - inode item
* 2 - refs
* 1 - root item
* 2 - dir items
*/
ret = btrfs_reserve_metadata_space(root, 6);
pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
if (!pending_snapshot)
return -ENOMEM;
btrfs_init_block_rsv(&pending_snapshot->block_rsv);
pending_snapshot->dentry = dentry;
pending_snapshot->root = root;
trans = btrfs_start_transaction(root->fs_info->extent_root, 5);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto fail;
}
ret = btrfs_snap_reserve_metadata(trans, pending_snapshot);
BUG_ON(ret);
list_add(&pending_snapshot->list,
&trans->transaction->pending_snapshots);
ret = btrfs_commit_transaction(trans, root->fs_info->extent_root);
BUG_ON(ret);
ret = pending_snapshot->error;
if (ret)
goto fail;
pending_snapshot = kzalloc(sizeof(*pending_snapshot), GFP_NOFS);
if (!pending_snapshot) {
ret = -ENOMEM;
btrfs_unreserve_metadata_space(root, 6);
goto fail;
}
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;
}
memcpy(pending_snapshot->name, name, namelen);
pending_snapshot->name[namelen] = '\0';
pending_snapshot->dentry = dentry;
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
pending_snapshot->root = root;
list_add(&pending_snapshot->list,
&trans->transaction->pending_snapshots);
ret = btrfs_commit_transaction(trans, root);
BUG_ON(ret);
btrfs_unreserve_metadata_space(root, 6);
btrfs_orphan_cleanup(pending_snapshot->snap);
inode = btrfs_lookup_dentry(dentry->d_parent->d_inode, dentry);
if (IS_ERR(inode)) {
@ -405,6 +391,7 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry,
d_instantiate(dentry, inode);
ret = 0;
fail:
kfree(pending_snapshot);
return ret;
}
@ -456,8 +443,7 @@ static noinline int btrfs_mksubvol(struct path *parent,
goto out_up_read;
if (snap_src) {
error = create_snapshot(snap_src, dentry,
name, namelen);
error = create_snapshot(snap_src, dentry);
} else {
error = create_subvol(BTRFS_I(dir)->root, dentry,
name, namelen);
@ -811,7 +797,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
device->name, (unsigned long long)new_size);
if (new_size > old_size) {
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
ret = btrfs_grow_device(trans, device, new_size);
btrfs_commit_transaction(trans, root);
} else {
@ -1300,7 +1286,13 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
if (err)
goto out_up_write;
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
err = PTR_ERR(trans);
goto out;
}
trans->block_rsv = &root->fs_info->global_block_rsv;
ret = btrfs_unlink_subvol(trans, root, dir,
dest->root_key.objectid,
dentry->d_name.name,
@ -1550,12 +1542,6 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
btrfs_wait_ordered_range(src, off, off+len);
}
trans = btrfs_start_transaction(root, 1);
BUG_ON(!trans);
/* punch hole in destination first */
btrfs_drop_extents(trans, inode, off, off + len, &hint_byte, 1);
/* clone data */
key.objectid = src->i_ino;
key.type = BTRFS_EXTENT_DATA_KEY;
@ -1566,7 +1552,7 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
* note the key will change type as we walk through the
* tree.
*/
ret = btrfs_search_slot(trans, root, &key, path, 0, 0);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
if (ret < 0)
goto out;
@ -1629,12 +1615,31 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
new_key.objectid = inode->i_ino;
new_key.offset = key.offset + destoff - off;
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
goto out;
}
if (type == BTRFS_FILE_EXTENT_REG ||
type == BTRFS_FILE_EXTENT_PREALLOC) {
if (off > key.offset) {
datao += off - key.offset;
datal -= off - key.offset;
}
if (key.offset + datal > off + len)
datal = off + len - key.offset;
ret = btrfs_drop_extents(trans, inode,
new_key.offset,
new_key.offset + datal,
&hint_byte, 1);
BUG_ON(ret);
ret = btrfs_insert_empty_item(trans, root, path,
&new_key, size);
if (ret)
goto out;
BUG_ON(ret);
leaf = path->nodes[0];
slot = path->slots[0];
@ -1645,14 +1650,6 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
extent = btrfs_item_ptr(leaf, slot,
struct btrfs_file_extent_item);
if (off > key.offset) {
datao += off - key.offset;
datal -= off - key.offset;
}
if (key.offset + datal > off + len)
datal = off + len - key.offset;
/* disko == 0 means it's a hole */
if (!disko)
datao = 0;
@ -1683,14 +1680,21 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
if (comp && (skip || trim)) {
ret = -EINVAL;
btrfs_end_transaction(trans, root);
goto out;
}
size -= skip + trim;
datal -= skip + trim;
ret = btrfs_drop_extents(trans, inode,
new_key.offset,
new_key.offset + datal,
&hint_byte, 1);
BUG_ON(ret);
ret = btrfs_insert_empty_item(trans, root, path,
&new_key, size);
if (ret)
goto out;
BUG_ON(ret);
if (skip) {
u32 start =
@ -1708,8 +1712,17 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd,
}
btrfs_mark_buffer_dirty(leaf);
}
btrfs_release_path(root, path);
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
if (new_key.offset + datal > inode->i_size)
btrfs_i_size_write(inode,
new_key.offset + datal);
BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
ret = btrfs_update_inode(trans, root, inode);
BUG_ON(ret);
btrfs_end_transaction(trans, root);
}
next:
btrfs_release_path(root, path);
key.offset++;
@ -1717,17 +1730,7 @@ next:
ret = 0;
out:
btrfs_release_path(root, path);
if (ret == 0) {
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
if (destoff + olen > inode->i_size)
btrfs_i_size_write(inode, destoff + olen);
BTRFS_I(inode)->flags = BTRFS_I(src)->flags;
ret = btrfs_update_inode(trans, root, inode);
}
btrfs_end_transaction(trans, root);
unlock_extent(&BTRFS_I(src)->io_tree, off, off+len, GFP_NOFS);
if (ret)
vmtruncate(inode, 0);
out_unlock:
mutex_unlock(&src->i_mutex);
mutex_unlock(&inode->i_mutex);

18
fs/btrfs/relocation.c
View File

@ -1649,7 +1649,7 @@ static noinline_for_stack int merge_reloc_root(struct reloc_control *rc,
}
if (level == 0 && rc->stage == UPDATE_DATA_PTRS) {
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, 0);
@ -1675,7 +1675,7 @@ static noinline_for_stack int merge_reloc_root(struct reloc_control *rc,
while (1) {
leaf = NULL;
replaced = 0;
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
max_level = level;
ret = walk_down_reloc_tree(reloc_root, path, &level);
@ -1803,7 +1803,7 @@ static void merge_func(struct btrfs_work *work)
merge_reloc_root(async->rc, root);
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
btrfs_update_reloc_root(trans, root);
btrfs_end_transaction(trans, root);
}
@ -3297,11 +3297,11 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
rc->create_reloc_root = 1;
set_reloc_control(rc);
trans = btrfs_start_transaction(rc->extent_root, 1);
trans = btrfs_join_transaction(rc->extent_root, 1);
btrfs_commit_transaction(trans, rc->extent_root);
while (1) {
trans = btrfs_start_transaction(rc->extent_root, 1);
trans = btrfs_start_transaction(rc->extent_root, 0);
ret = find_next_extent(trans, rc, path);
if (ret < 0)
@ -3411,7 +3411,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
smp_mb();
if (rc->extents_found > 0) {
trans = btrfs_start_transaction(rc->extent_root, 1);
trans = btrfs_join_transaction(rc->extent_root, 1);
btrfs_commit_transaction(trans, rc->extent_root);
}
@ -3420,7 +3420,7 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
unset_reloc_control(rc);
/* get rid of pinned extents */
trans = btrfs_start_transaction(rc->extent_root, 1);
trans = btrfs_join_transaction(rc->extent_root, 1);
btrfs_commit_transaction(trans, rc->extent_root);
return err;
@ -3475,7 +3475,7 @@ static struct inode *create_reloc_inode(struct btrfs_fs_info *fs_info,
if (IS_ERR(root))
return ERR_CAST(root);
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 6);
BUG_ON(!trans);
err = btrfs_find_free_objectid(trans, root, objectid, &objectid);
@ -3619,7 +3619,7 @@ static noinline_for_stack int mark_garbage_root(struct btrfs_root *root)
struct btrfs_trans_handle *trans;
int ret;
trans = btrfs_start_transaction(root->fs_info->tree_root, 1);
trans = btrfs_start_transaction(root->fs_info->tree_root, 0);
memset(&root->root_item.drop_progress, 0,
sizeof(root->root_item.drop_progress));

2
fs/btrfs/super.c
View File

@ -498,7 +498,7 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
btrfs_start_delalloc_inodes(root, 0);
btrfs_wait_ordered_extents(root, 0, 0);
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
ret = btrfs_commit_transaction(trans, root);
return ret;
}

137
fs/btrfs/transaction.c
View File

@ -165,53 +165,89 @@ enum btrfs_trans_type {
TRANS_USERSPACE,
};
static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
int num_blocks, int type)
static int may_wait_transaction(struct btrfs_root *root, int type)
{
struct btrfs_trans_handle *h =
kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
int ret;
mutex_lock(&root->fs_info->trans_mutex);
if (!root->fs_info->log_root_recovering &&
((type == TRANS_START && !root->fs_info->open_ioctl_trans) ||
type == TRANS_USERSPACE))
return 1;
return 0;
}
static struct btrfs_trans_handle *start_transaction(struct btrfs_root *root,
u64 num_items, int type)
{
struct btrfs_trans_handle *h;
struct btrfs_transaction *cur_trans;
int retries = 0;
int ret;
again:
h = kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS);
if (!h)
return ERR_PTR(-ENOMEM);
mutex_lock(&root->fs_info->trans_mutex);
if (may_wait_transaction(root, type))
wait_current_trans(root);
ret = join_transaction(root);
BUG_ON(ret);
h->transid = root->fs_info->running_transaction->transid;
h->transaction = root->fs_info->running_transaction;
h->blocks_reserved = num_blocks;
cur_trans = root->fs_info->running_transaction;
cur_trans->use_count++;
mutex_unlock(&root->fs_info->trans_mutex);
h->transid = cur_trans->transid;
h->transaction = cur_trans;
h->blocks_used = 0;
h->block_group = 0;
h->bytes_reserved = 0;
h->delayed_ref_updates = 0;
h->block_rsv = NULL;
if (!current->journal_info && type != TRANS_USERSPACE)
current->journal_info = h;
smp_mb();
if (cur_trans->blocked && may_wait_transaction(root, type)) {
btrfs_commit_transaction(h, root);
goto again;
}
root->fs_info->running_transaction->use_count++;
if (num_items > 0) {
ret = btrfs_trans_reserve_metadata(h, root, num_items,
&retries);
if (ret == -EAGAIN) {
btrfs_commit_transaction(h, root);
goto again;
}
if (ret < 0) {
btrfs_end_transaction(h, root);
return ERR_PTR(ret);
}
}
mutex_lock(&root->fs_info->trans_mutex);
record_root_in_trans(h, root);
mutex_unlock(&root->fs_info->trans_mutex);
if (!current->journal_info && type != TRANS_USERSPACE)
current->journal_info = h;
return h;
}
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
int num_blocks)
int num_items)
{
return start_transaction(root, num_blocks, TRANS_START);
return start_transaction(root, num_items, TRANS_START);
}
struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
int num_blocks)
{
return start_transaction(root, num_blocks, TRANS_JOIN);
return start_transaction(root, 0, TRANS_JOIN);
}
struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
int num_blocks)
{
return start_transaction(r, num_blocks, TRANS_USERSPACE);
return start_transaction(r, 0, TRANS_USERSPACE);
}
/* wait for a transaction commit to be fully complete */
@ -312,6 +348,8 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
count++;
}
btrfs_trans_release_metadata(trans, root);
mutex_lock(&info->trans_mutex);
cur_trans = info->running_transaction;
WARN_ON(cur_trans != trans->transaction);
@ -757,47 +795,49 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
struct btrfs_root *root = pending->root;
struct btrfs_root *parent_root;
struct inode *parent_inode;
struct dentry *dentry;
struct extent_buffer *tmp;
struct extent_buffer *old;
int ret;
u64 objectid;
int namelen;
u64 index = 0;
parent_inode = pending->dentry->d_parent->d_inode;
parent_root = BTRFS_I(parent_inode)->root;
u64 objectid;
new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS);
if (!new_root_item) {
ret = -ENOMEM;
pending->error = -ENOMEM;
goto fail;
}
ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid);
if (ret)
if (ret) {
pending->error = ret;
goto fail;
}
key.objectid = objectid;
/* record when the snapshot was created in key.offset */
key.offset = trans->transid;
btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
key.offset = (u64)-1;
key.type = BTRFS_ROOT_ITEM_KEY;
memcpy(&pending->root_key, &key, sizeof(key));
pending->root_key.offset = (u64)-1;
trans->block_rsv = &pending->block_rsv;
dentry = pending->dentry;
parent_inode = dentry->d_parent->d_inode;
parent_root = BTRFS_I(parent_inode)->root;
record_root_in_trans(trans, parent_root);
/*
* insert the directory item
*/
namelen = strlen(pending->name);
ret = btrfs_set_inode_index(parent_inode, &index);
BUG_ON(ret);
ret = btrfs_insert_dir_item(trans, parent_root,
pending->name, namelen,
parent_inode->i_ino,
&pending->root_key, BTRFS_FT_DIR, index);
dentry->d_name.name, dentry->d_name.len,
parent_inode->i_ino, &key,
BTRFS_FT_DIR, index);
BUG_ON(ret);
btrfs_i_size_write(parent_inode, parent_inode->i_size + namelen * 2);
btrfs_i_size_write(parent_inode, parent_inode->i_size +
dentry->d_name.len * 2);
ret = btrfs_update_inode(trans, parent_root, parent_inode);
BUG_ON(ret);
@ -814,22 +854,29 @@ static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans,
free_extent_buffer(old);
btrfs_set_root_node(new_root_item, tmp);
ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
new_root_item);
BUG_ON(ret);
/* record when the snapshot was created in key.offset */
key.offset = trans->transid;
ret = btrfs_insert_root(trans, tree_root, &key, new_root_item);
btrfs_tree_unlock(tmp);
free_extent_buffer(tmp);
ret = btrfs_add_root_ref(trans, parent_root->fs_info->tree_root,
pending->root_key.objectid,
parent_root->root_key.objectid,
parent_inode->i_ino, index, pending->name,
namelen);
BUG_ON(ret);
/*
* insert root back/forward references
*/
ret = btrfs_add_root_ref(trans, tree_root, objectid,
parent_root->root_key.objectid,
parent_inode->i_ino, index,
dentry->d_name.name, dentry->d_name.len);
BUG_ON(ret);
key.offset = (u64)-1;
pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key);
BUG_ON(IS_ERR(pending->snap));
fail:
kfree(new_root_item);
return ret;
btrfs_block_rsv_release(root, &pending->block_rsv, (u64)-1);
return 0;
}
/*
@ -898,6 +945,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
ret = btrfs_run_delayed_refs(trans, root, 0);
BUG_ON(ret);
btrfs_trans_release_metadata(trans, root);
cur_trans = trans->transaction;
/*
* set the flushing flag so procs in this transaction have to

13
fs/btrfs/transaction.h
View File

@ -57,8 +57,11 @@ struct btrfs_trans_handle {
struct btrfs_pending_snapshot {
struct dentry *dentry;
struct btrfs_root *root;
char *name;
struct btrfs_key root_key;
struct btrfs_root *snap;
/* block reservation for the operation */
struct btrfs_block_rsv block_rsv;
/* extra metadata reseration for relocation */
int error;
struct list_head list;
};
@ -85,11 +88,11 @@ static inline void btrfs_set_inode_last_trans(struct btrfs_trans_handle *trans,
int btrfs_end_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root,
int num_blocks);
int num_items);
struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root,
int num_blocks);
int num_blocks);
struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *r,
int num_blocks);
int num_blocks);
int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans,

17
fs/btrfs/volumes.c
View File

@ -1097,7 +1097,7 @@ static int btrfs_rm_dev_item(struct btrfs_root *root,
if (!path)
return -ENOMEM;
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
key.type = BTRFS_DEV_ITEM_KEY;
key.offset = device->devid;
@ -1486,7 +1486,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
goto error;
}
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
lock_chunks(root);
device->barriers = 1;
@ -1751,9 +1751,10 @@ static int btrfs_relocate_chunk(struct btrfs_root *root,
/* step one, relocate all the extents inside this chunk */
ret = btrfs_relocate_block_group(extent_root, chunk_offset);
BUG_ON(ret);
if (ret)
return ret;
trans = btrfs_start_transaction(root, 1);
trans = btrfs_start_transaction(root, 0);
BUG_ON(!trans);
lock_chunks(root);
@ -1925,7 +1926,7 @@ int btrfs_balance(struct btrfs_root *dev_root)
break;
BUG_ON(ret);
trans = btrfs_start_transaction(dev_root, 1);
trans = btrfs_start_transaction(dev_root, 0);
BUG_ON(!trans);
ret = btrfs_grow_device(trans, device, old_size);
@ -2094,11 +2095,7 @@ again:
}
/* Shrinking succeeded, else we would be at "done". */
trans = btrfs_start_transaction(root, 1);
if (!trans) {
ret = -ENOMEM;
goto done;
}
trans = btrfs_start_transaction(root, 0);
lock_chunks(root);
device->disk_total_bytes = new_size;

12
fs/btrfs/xattr.c
View File

@ -154,15 +154,10 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans,
if (trans)
return do_setxattr(trans, inode, name, value, size, flags);
ret = btrfs_reserve_metadata_space(root, 2);
if (ret)
return ret;
trans = btrfs_start_transaction(root, 2);
if (IS_ERR(trans))
return PTR_ERR(trans);
trans = btrfs_start_transaction(root, 1);
if (!trans) {
ret = -ENOMEM;
goto out;
}
btrfs_set_trans_block_group(trans, inode);
ret = do_setxattr(trans, inode, name, value, size, flags);
@ -174,7 +169,6 @@ int __btrfs_setxattr(struct btrfs_trans_handle *trans,
BUG_ON(ret);
out:
btrfs_end_transaction_throttle(trans, root);
btrfs_unreserve_metadata_space(root, 2);
return ret;
}