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Btrfs: Add delayed allocation to the extent based page tree code

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-08-27 16:49:44 -04:00 committed by David Woodhouse
parent a52d9a8033
commit b888db2bd7
6 changed files with 216 additions and 135 deletions
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9
fs/btrfs/extent-tree.c
View File

@ -39,7 +39,6 @@ static int cache_block_group(struct btrfs_root *root,
u64 i;
u64 last = 0;
u64 hole_size;
u64 limit;
int found = 0;
root = root->fs_info->extent_root;
@ -62,7 +61,6 @@ static int cache_block_group(struct btrfs_root *root,
return ret;
if (ret && path->slots[0] > 0)
path->slots[0]--;
limit = block_group->key.objectid + block_group->key.offset;
while(1) {
leaf = btrfs_buffer_leaf(path->nodes[0]);
slot = path->slots[0];
@ -982,7 +980,6 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
struct btrfs_block_group_cache *block_group;
int full_scan = 0;
int wrapped = 0;
u64 limit;
WARN_ON(num_blocks < 1);
ins->flags = 0;
@ -1049,12 +1046,6 @@ static int find_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
l = btrfs_buffer_leaf(path->nodes[0]);
slot = path->slots[0];
if (slot >= btrfs_header_nritems(&l->header)) {
if (start_found)
limit = last_block +
(block_group->key.offset >> 1);
else
limit = search_start +
(block_group->key.offset >> 1);
ret = btrfs_next_leaf(root, path);
if (ret == 0)
continue;

147
fs/btrfs/extent_map.c
View File

@ -30,9 +30,6 @@ struct tree_entry {
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
static LIST_HEAD(all_states);
spinlock_t state_lock = SPIN_LOCK_UNLOCKED;
void __init extent_map_init(void)
{
extent_map_cache = kmem_cache_create("extent_map",
@ -49,15 +46,6 @@ void __init extent_map_init(void)
void __exit extent_map_exit(void)
{
while(!list_empty(&all_states)) {
struct extent_state *state;
struct list_head *cur = all_states.next;
state = list_entry(cur, struct extent_state, list);
printk("found leaked state %Lu %Lu state %d in_tree %d\n",
state->start, state->end, state->state, state->in_tree);
list_del(&state->list);
kfree(state);
}
if (extent_map_cache)
kmem_cache_destroy(extent_map_cache);
if (extent_state_cache)
@ -69,6 +57,7 @@ void extent_map_tree_init(struct extent_map_tree *tree,
{
tree->map.rb_node = NULL;
tree->state.rb_node = NULL;
tree->fill_delalloc = NULL;
rwlock_init(&tree->lock);
tree->mapping = mapping;
}
@ -106,9 +95,6 @@ struct extent_state *alloc_extent_state(gfp_t mask)
state->in_tree = 0;
atomic_set(&state->refs, 1);
init_waitqueue_head(&state->wq);
spin_lock_irq(&state_lock);
list_add(&state->list, &all_states);
spin_unlock_irq(&state_lock);
return state;
}
EXPORT_SYMBOL(alloc_extent_state);
@ -117,9 +103,6 @@ void free_extent_state(struct extent_state *state)
{
if (atomic_dec_and_test(&state->refs)) {
WARN_ON(state->in_tree);
spin_lock_irq(&state_lock);
list_del_init(&state->list);
spin_unlock_irq(&state_lock);
kmem_cache_free(extent_state_cache, state);
}
}
@ -369,7 +352,7 @@ static int insert_state(struct extent_map_tree *tree,
if (node) {
struct extent_state *found;
found = rb_entry(node, struct extent_state, rb_node);
printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, start, end);
printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, start, end);
free_extent_state(state);
return -EEXIST;
}
@ -408,7 +391,7 @@ static int split_state(struct extent_map_tree *tree, struct extent_state *orig,
if (node) {
struct extent_state *found;
found = rb_entry(node, struct extent_state, rb_node);
printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, prealloc->start, prealloc->end);
printk("found node %Lu %Lu on insert of %Lu %Lu\n", found->start, found->end, prealloc->start, prealloc->end);
free_extent_state(prealloc);
return -EEXIST;
}
@ -792,10 +775,20 @@ int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
}
EXPORT_SYMBOL(set_extent_dirty);
int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
gfp_t mask)
{
return set_extent_bit(tree, start, end,
EXTENT_DELALLOC | EXTENT_DIRTY, 0, NULL,
mask);
}
EXPORT_SYMBOL(set_extent_delalloc);
int clear_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
gfp_t mask)
{
return clear_extent_bit(tree, start, end, EXTENT_DIRTY, 0, 0, mask);
return clear_extent_bit(tree, start, end,
EXTENT_DIRTY | EXTENT_DELALLOC, 0, 0, mask);
}
EXPORT_SYMBOL(clear_extent_dirty);
@ -922,6 +915,62 @@ int set_range_writeback(struct extent_map_tree *tree, u64 start, u64 end)
}
EXPORT_SYMBOL(set_range_writeback);
u64 find_lock_delalloc_range(struct extent_map_tree *tree,
u64 start, u64 lock_start, u64 *end, u64 max_bytes)
{
struct rb_node *node;
struct extent_state *state;
u64 cur_start = start;
u64 found = 0;
u64 total_bytes = 0;
write_lock_irq(&tree->lock);
/*
* this search will find all the extents that end after
* our range starts.
*/
search_again:
node = tree_search(&tree->state, cur_start);
if (!node || IS_ERR(node)) {
goto out;
}
while(1) {
state = rb_entry(node, struct extent_state, rb_node);
if (state->start != cur_start) {
goto out;
}
if (!(state->state & EXTENT_DELALLOC)) {
goto out;
}
if (state->start >= lock_start) {
if (state->state & EXTENT_LOCKED) {
DEFINE_WAIT(wait);
atomic_inc(&state->refs);
write_unlock_irq(&tree->lock);
schedule();
write_lock_irq(&tree->lock);
finish_wait(&state->wq, &wait);
free_extent_state(state);
goto search_again;
}
state->state |= EXTENT_LOCKED;
}
found++;
*end = state->end;
cur_start = state->end + 1;
node = rb_next(node);
if (!node)
break;
total_bytes = state->end - state->start + 1;
if (total_bytes >= max_bytes)
break;
}
out:
write_unlock_irq(&tree->lock);
return found;
}
/*
* helper function to lock both pages and extents in the tree.
* pages must be locked first.
@ -1285,6 +1334,7 @@ int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
if (!PagePrivate(page)) {
SetPagePrivate(page);
set_page_private(page, 1);
WARN_ON(!page->mapping->a_ops->invalidatepage);
page_cache_get(page);
}
@ -1384,7 +1434,10 @@ int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
size_t blocksize;
loff_t i_size = i_size_read(inode);
unsigned long end_index = i_size >> PAGE_CACHE_SHIFT;
u64 nr_delalloc;
u64 delalloc_end;
WARN_ON(!PageLocked(page));
if (page->index > end_index) {
clear_extent_dirty(tree, start, page_end, GFP_NOFS);
unlock_page(page);
@ -1400,11 +1453,34 @@ int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
if (!PagePrivate(page)) {
SetPagePrivate(page);
set_page_private(page, 1);
WARN_ON(!page->mapping->a_ops->invalidatepage);
page_cache_get(page);
}
end = page_end;
lock_extent(tree, start, page_end, GFP_NOFS);
nr_delalloc = find_lock_delalloc_range(tree, start, page_end + 1,
&delalloc_end,
128 * 1024 * 1024);
if (nr_delalloc) {
tree->fill_delalloc(inode, start, delalloc_end);
if (delalloc_end >= page_end + 1) {
clear_extent_bit(tree, page_end + 1, delalloc_end,
EXTENT_LOCKED | EXTENT_DELALLOC,
1, 0, GFP_NOFS);
}
clear_extent_bit(tree, start, page_end, EXTENT_DELALLOC,
0, 0, GFP_NOFS);
if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) {
printk("found delalloc bits after clear extent_bit\n");
}
} else if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) {
printk("found delalloc bits after find_delalloc_range returns 0\n");
}
end = page_end;
if (test_range_bit(tree, start, page_end, EXTENT_DELALLOC, 0)) {
printk("found delalloc bits after lock_extent\n");
}
if (last_byte <= start) {
clear_extent_dirty(tree, start, page_end, GFP_NOFS);
@ -1419,7 +1495,7 @@ int extent_write_full_page(struct extent_map_tree *tree, struct page *page,
clear_extent_dirty(tree, cur, page_end, GFP_NOFS);
break;
}
em = get_extent(inode, page, page_offset, cur, end, 1);
em = get_extent(inode, page, page_offset, cur, end, 0);
if (IS_ERR(em) || !em) {
SetPageError(page);
break;
@ -1507,6 +1583,7 @@ int extent_commit_write(struct extent_map_tree *tree,
if (!PagePrivate(page)) {
SetPagePrivate(page);
set_page_private(page, 1);
WARN_ON(!page->mapping->a_ops->invalidatepage);
page_cache_get(page);
}
@ -1543,6 +1620,7 @@ int extent_prepare_write(struct extent_map_tree *tree,
if (!PagePrivate(page)) {
SetPagePrivate(page);
set_page_private(page, 1);
WARN_ON(!page->mapping->a_ops->invalidatepage);
page_cache_get(page);
}
block_start = (page_start + from) & ~((u64)blocksize - 1);
@ -1628,29 +1706,28 @@ int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page)
u64 start = page->index << PAGE_CACHE_SHIFT;
u64 end = start + PAGE_CACHE_SIZE - 1;
u64 orig_start = start;
int ret = 1;
while (start <= end) {
em = lookup_extent_mapping(tree, start, end);
if (!em || IS_ERR(em))
break;
if (test_range_bit(tree, em->start, em->end,
EXTENT_LOCKED, 0)) {
if (!test_range_bit(tree, em->start, em->end,
EXTENT_LOCKED, 0)) {
remove_extent_mapping(tree, em);
/* once for the rb tree */
free_extent_map(em);
start = em->end + 1;
printk("range still locked %Lu %Lu\n", em->start, em->end);
break;
}
remove_extent_mapping(tree, em);
start = em->end + 1;
/* once for the rb tree */
free_extent_map(em);
/* once for us */
free_extent_map(em);
}
WARN_ON(test_range_bit(tree, orig_start, end, EXTENT_WRITEBACK, 0));
clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE,
1, 1, GFP_NOFS);
return 1;
if (test_range_bit(tree, orig_start, end, EXTENT_LOCKED, 0))
ret = 0;
else
clear_extent_bit(tree, orig_start, end, EXTENT_UPTODATE,
1, 1, GFP_NOFS);
return ret;
}
EXPORT_SYMBOL(try_release_extent_mapping);

3
fs/btrfs/extent_map.h
View File

@ -11,6 +11,7 @@ struct extent_map_tree {
struct rb_root state;
struct address_space *mapping;
rwlock_t lock;
int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
};
/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
@ -74,6 +75,8 @@ int set_extent_new(struct extent_map_tree *tree, u64 start, u64 end,
gfp_t mask);
int set_extent_dirty(struct extent_map_tree *tree, u64 start, u64 end,
gfp_t mask);
int set_extent_delalloc(struct extent_map_tree *tree, u64 start, u64 end,
gfp_t mask);
int extent_invalidatepage(struct extent_map_tree *tree,
struct page *page, unsigned long offset);
int extent_write_full_page(struct extent_map_tree *tree, struct page *page,

50
fs/btrfs/file.c
View File

@ -143,7 +143,6 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
struct inode *inode = file->f_path.dentry->d_inode;
struct extent_map *em;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct btrfs_key ins;
u64 hint_block;
u64 num_blocks;
u64 start_pos;
@ -162,6 +161,7 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
inode->i_blkbits;
end_of_last_block = start_pos + (num_blocks << inode->i_blkbits) - 1;
lock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
if (!trans) {
@ -179,16 +179,6 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
/* FIXME...EIEIO, ENOSPC and more */
/* step one, delete the existing extents in this range */
/* FIXME blocksize != pagesize */
if (start_pos < inode->i_size) {
err = btrfs_drop_extents(trans, root, inode,
start_pos, (pos + write_bytes + root->blocksize -1) &
~((u64)root->blocksize - 1), &hint_block);
if (err)
goto failed;
}
/* insert any holes we need to create */
if (inode->i_size < start_pos) {
u64 last_pos_in_file;
@ -213,29 +203,28 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
*/
if (isize >= PAGE_CACHE_SIZE || pos + write_bytes < inode->i_size ||
pos + write_bytes - start_pos > BTRFS_MAX_INLINE_DATA_SIZE(root)) {
err = btrfs_alloc_extent(trans, root, inode->i_ino,
num_blocks, 0, hint_block, (u64)-1,
&ins, 1);
BUG_ON(err);
err = btrfs_insert_file_extent(trans, root, inode->i_ino,
start_pos, ins.objectid, ins.offset,
ins.offset);
BUG_ON(err);
em->start = start_pos;
em->end = end_of_last_block;
em->block_start = ins.objectid << inode->i_blkbits;
em->block_end = em->block_start +
(ins.offset << inode->i_blkbits) - 1;
set_extent_dirty(em_tree, start_pos, end_of_last_block,
GFP_NOFS);
err = add_extent_mapping(em_tree, em);
u64 last_end;
for (i = 0; i < num_pages; i++) {
struct page *p = pages[i];
SetPageUptodate(p);
__set_page_dirty_nobuffers(p);
set_page_dirty(p);
}
last_end = pages[num_pages -1]->index << PAGE_CACHE_SHIFT;
last_end += PAGE_CACHE_SIZE - 1;
set_extent_delalloc(em_tree, start_pos, end_of_last_block,
GFP_NOFS);
} else {
struct page *p = pages[0];
/* step one, delete the existing extents in this range */
/* FIXME blocksize != pagesize */
if (start_pos < inode->i_size) {
err = btrfs_drop_extents(trans, root, inode, start_pos,
(pos + write_bytes + root->blocksize -1) &
~((u64)root->blocksize - 1), &hint_block);
if (err)
goto failed;
}
err = insert_inline_extent(trans, root, inode, start_pos,
end_pos - start_pos, p, 0);
BUG_ON(err);
@ -253,6 +242,7 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
err = btrfs_end_transaction(trans, root);
out_unlock:
mutex_unlock(&root->fs_info->fs_mutex);
unlock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS);
free_extent_map(em);
return err;
}
@ -531,7 +521,7 @@ static int prepare_pages(struct btrfs_root *root,
u64 num_blocks;
u64 start_pos;
start_pos = pos & ~((u64)PAGE_CACHE_SIZE - 1);
start_pos = pos & ~((u64)root->blocksize - 1);
num_blocks = (write_bytes + pos - start_pos + root->blocksize - 1) >>
inode->i_blkbits;
@ -548,8 +538,10 @@ static int prepare_pages(struct btrfs_root *root,
if (!PagePrivate(pages[i])) {
SetPagePrivate(pages[i]);
set_page_private(pages[i], 1);
WARN_ON(!pages[i]->mapping->a_ops->invalidatepage);
page_cache_get(pages[i]);
}
WARN_ON(!PageLocked(pages[i]));
}
return 0;
}

141
fs/btrfs/inode.c
View File

@ -70,6 +70,40 @@ static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
[S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
};
static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
{
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
struct btrfs_key ins;
u64 alloc_hint = 0;
u64 num_blocks;
int ret;
u64 blocksize = 1 << inode->i_blkbits;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
BUG_ON(!trans);
num_blocks = (end - start + blocksize) & ~(blocksize - 1);
ret = btrfs_drop_extents(trans, root, inode,
start, start + num_blocks, &alloc_hint);
num_blocks = num_blocks >> inode->i_blkbits;
ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_blocks, 0,
alloc_hint, (u64)-1, &ins, 1);
if (ret) {
WARN_ON(1);
goto out;
}
ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
start, ins.objectid, ins.offset,
ins.offset);
out:
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
return ret;
}
void btrfs_read_locked_inode(struct inode *inode)
{
struct btrfs_path *path;
@ -121,8 +155,7 @@ void btrfs_read_locked_inode(struct inode *inode)
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_mapping->a_ops = &btrfs_aops;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->extent_tree.fill_delalloc = run_delalloc_range;
inode->i_fop = &btrfs_file_operations;
inode->i_op = &btrfs_file_inode_operations;
break;
@ -450,11 +483,17 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
BUG_ON(ret);
}
if (item_end < inode->i_size) {
if (found_type) {
btrfs_set_key_type(&key, found_type - 1);
continue;
if (found_type == BTRFS_DIR_ITEM_KEY) {
found_type = BTRFS_INODE_ITEM_KEY;
} else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
found_type = BTRFS_CSUM_ITEM_KEY;
} else if (found_type) {
found_type--;
} else {
break;
}
break;
btrfs_set_key_type(&key, found_type - 1);
continue;
}
if (btrfs_disk_key_offset(found_key) >= inode->i_size)
del_item = 1;
@ -514,47 +553,34 @@ static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
return ret;
}
static int btrfs_cow_one_page(struct btrfs_trans_handle *trans,
struct inode *inode, struct page *page,
static int btrfs_cow_one_page(struct inode *inode, struct page *page,
size_t zero_start)
{
char *kaddr;
int ret = 0;
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 alloc_hint = 0;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
u64 page_start = page->index << PAGE_CACHE_SHIFT;
struct btrfs_key ins;
u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
if (!PagePrivate(page)) {
SetPagePrivate(page);
set_page_private(page, 1);
WARN_ON(!page->mapping->a_ops->invalidatepage);
page_cache_get(page);
}
btrfs_set_trans_block_group(trans, inode);
ret = btrfs_drop_extents(trans, root, inode,
page_start, page_start + PAGE_CACHE_SIZE,
&alloc_hint);
if (ret)
goto out;
ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1, 0,
alloc_hint, (u64)-1, &ins, 1);
if (ret)
goto out;
ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
page_start, ins.objectid, 1, 1);
if (ret)
goto out;
SetPageChecked(page);
kaddr = kmap(page);
lock_extent(em_tree, page_start, page_end, GFP_NOFS);
set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
page_end, GFP_NOFS);
if (zero_start != PAGE_CACHE_SIZE) {
kaddr = kmap(page);
memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
flush_dcache_page(page);
kunmap(page);
}
kunmap(page);
set_page_dirty(page);
unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
out:
return ret;
}
@ -565,8 +591,6 @@ static int btrfs_cow_one_page(struct btrfs_trans_handle *trans,
static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
{
struct inode *inode = mapping->host;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
unsigned blocksize = 1 << inode->i_blkbits;
pgoff_t index = from >> PAGE_CACHE_SHIFT;
unsigned offset = from & (PAGE_CACHE_SIZE-1);
@ -591,21 +615,7 @@ static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
}
page_start = page->index << PAGE_CACHE_SHIFT;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_cow_one_page(trans, inode, page, offset);
if (!ret) {
char *kaddr = kmap(page);
ret = btrfs_csum_file_block(trans, root, inode->i_ino,
page_start, kaddr, PAGE_CACHE_SIZE);
kunmap(page);
}
set_extent_dirty(&BTRFS_I(inode)->extent_tree,
page_start, page_start + PAGE_CACHE_SIZE - 1,
GFP_NOFS);
set_page_dirty(page);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
ret = btrfs_cow_one_page(inode, page, offset);
unlock_page(page);
page_cache_release(page);
@ -757,6 +767,8 @@ static int btrfs_init_locked_inode(struct inode *inode, void *p)
struct btrfs_iget_args *args = p;
inode->i_ino = args->ino;
BTRFS_I(inode)->root = args->root;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
inode->i_mapping, GFP_NOFS);
return 0;
}
@ -968,7 +980,10 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
if (!inode)
return ERR_PTR(-ENOMEM);
extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->root = root;
if (mode & S_IFDIR)
owner = 0;
else
@ -1128,6 +1143,7 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
inode->i_op = &btrfs_file_inode_operations;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->extent_tree.fill_delalloc = run_delalloc_range;
}
dir->i_sb->s_dirt = 1;
btrfs_update_inode_block_group(trans, inode);
@ -1344,9 +1360,11 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
extent_end = extent_start +
(btrfs_file_extent_num_blocks(item) << inode->i_blkbits);
err = 0;
if (start < extent_start || start > extent_end) {
if (start < extent_start || start >= extent_end) {
em->start = start;
if (start < extent_start) {
if (end < extent_start)
goto not_found;
em->end = extent_end - 1;
} else {
em->end = end;
@ -1375,9 +1393,11 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
size = btrfs_file_extent_inline_len(leaf->items +
path->slots[0]);
extent_end = extent_start + size;
if (start < extent_start || start > extent_end) {
if (start < extent_start || start >= extent_end) {
em->start = start;
if (start < extent_start) {
if (end < extent_start)
goto not_found;
em->end = extent_end - 1;
} else {
em->end = end;
@ -1412,8 +1432,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
insert:
btrfs_release_path(root, path);
if (em->start > start || em->end < start) {
printk("bad extent! %Lu %Lu start %Lu end %Lu\n", em->start, em->end, start, end);
WARN_ON(1);
printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
err = -EIO;
goto out;
}
@ -1648,6 +1667,13 @@ int btrfs_readpage(struct file *file, struct page *page)
static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
{
struct extent_map_tree *tree;
if (current->flags & PF_MEMALLOC) {
redirty_page_for_writepage(wbc, page);
unlock_page(page);
return 0;
}
tree = &BTRFS_I(page->mapping->host)->extent_tree;
return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
}
@ -1698,8 +1724,6 @@ static void btrfs_invalidatepage(struct page *page, unsigned long offset)
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
{
struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_trans_handle *trans;
unsigned long end;
loff_t size;
int ret = -EINVAL;
@ -1722,15 +1746,7 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
else
end = PAGE_CACHE_SIZE;
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
ret = btrfs_cow_one_page(trans, inode, page, end);
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
set_extent_dirty(&BTRFS_I(inode)->extent_tree,
page_start, page_start + PAGE_CACHE_SIZE - 1,
GFP_NOFS);
set_page_dirty(page);
ret = btrfs_cow_one_page(inode, page, end);
out_unlock:
unlock_page(page);
@ -2264,6 +2280,7 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
inode->i_op = &btrfs_file_inode_operations;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->extent_tree.fill_delalloc = run_delalloc_range;
}
dir->i_sb->s_dirt = 1;
btrfs_update_inode_block_group(trans, inode);

1
fs/btrfs/super.c
View File

@ -83,6 +83,7 @@ static int btrfs_fill_super(struct super_block * sb, void * data, int silent)
bi->location.offset = 0;
bi->location.flags = 0;
bi->root = tree_root;
btrfs_set_key_type(&bi->location, BTRFS_INODE_ITEM_KEY);
if (!inode) {