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Btrfs: Split the extent_map code into two parts

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There is now extent_map for mapping offsets in the file to disk and
extent_io for state tracking, IO submission and extent_bufers.

The new extent_map code shifts from [start,end] pairs to [start,len], and
pushes the locking out into the caller.  This allows a few performance
optimizations and is easier to use.

A number of extent_map usage bugs were fixed, mostly with failing
to remove extent_map entries when changing the file.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-01-24 16:13:08 -05:00
parent 5f56406aab
commit d1310b2e0c
14 changed files with 3614 additions and 3415 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/btrfs/Makefile
View File

@ -5,7 +5,8 @@ obj-m := btrfs.o
btrfs-y := super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
hash.o file-item.o inode-item.o inode-map.o disk-io.o \
transaction.o bit-radix.o inode.o file.o tree-defrag.o \
extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o
extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \
extent_io.o
ifeq ($(CONFIG_FS_POSIX_ACL),y)
btrfs-y += acl.o

2
fs/btrfs/btrfs_inode.h
View File

@ -20,6 +20,7 @@
#define __BTRFS_I__
#include "extent_map.h"
#include "extent_io.h"
/* in memory btrfs inode */
struct btrfs_inode {
@ -27,6 +28,7 @@ struct btrfs_inode {
struct btrfs_block_group_cache *block_group;
struct btrfs_key location;
struct extent_map_tree extent_tree;
struct extent_io_tree io_tree;
struct inode vfs_inode;
u64 ordered_trans;

15
fs/btrfs/ctree.h
View File

@ -27,6 +27,7 @@
#include <linux/completion.h>
#include <asm/kmap_types.h>
#include "bit-radix.h"
#include "extent_io.h"
#include "extent_map.h"
struct btrfs_trans_handle;
@ -314,11 +315,11 @@ struct btrfs_fs_info {
struct btrfs_root *tree_root;
struct radix_tree_root fs_roots_radix;
struct extent_map_tree free_space_cache;
struct extent_map_tree block_group_cache;
struct extent_map_tree pinned_extents;
struct extent_map_tree pending_del;
struct extent_map_tree extent_ins;
struct extent_io_tree free_space_cache;
struct extent_io_tree block_group_cache;
struct extent_io_tree pinned_extents;
struct extent_io_tree pending_del;
struct extent_io_tree extent_ins;
u64 generation;
u64 last_trans_committed;
@ -956,7 +957,7 @@ u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
u64 first_extent);
int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
struct btrfs_root *root);
int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
btrfs_fs_info *info,
u64 bytenr);
@ -1001,7 +1002,7 @@ int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
u64 owner_objectid, u64 owner_offset, int pin);
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_map_tree *unpin);
struct extent_io_tree *unpin);
int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
u64 bytenr, u64 num_bytes,

123
fs/btrfs/disk-io.c
View File

@ -43,14 +43,14 @@ static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
}
#endif
static struct extent_map_ops btree_extent_map_ops;
static struct extent_io_ops btree_extent_io_ops;
struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
u64 bytenr, u32 blocksize)
{
struct inode *btree_inode = root->fs_info->btree_inode;
struct extent_buffer *eb;
eb = find_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
bytenr, blocksize, GFP_NOFS);
return eb;
}
@ -61,13 +61,13 @@ struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
struct inode *btree_inode = root->fs_info->btree_inode;
struct extent_buffer *eb;
eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->extent_tree,
eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree,
bytenr, blocksize, NULL, GFP_NOFS);
return eb;
}
struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
size_t page_offset, u64 start, u64 end,
size_t page_offset, u64 start, u64 len,
int create)
{
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
@ -75,7 +75,9 @@ struct extent_map *btree_get_extent(struct inode *inode, struct page *page,
int ret;
again:
em = lookup_extent_mapping(em_tree, start, end);
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
spin_unlock(&em_tree->lock);
if (em) {
goto out;
}
@ -85,11 +87,14 @@ again:
goto out;
}
em->start = 0;
em->end = (i_size_read(inode) & ~((u64)PAGE_CACHE_SIZE -1)) - 1;
em->len = i_size_read(inode);
em->block_start = 0;
em->block_end = em->end;
em->bdev = inode->i_sb->s_bdev;
spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
spin_unlock(&em_tree->lock);
if (ret == -EEXIST) {
free_extent_map(em);
em = NULL;
@ -175,13 +180,13 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
{
struct extent_map_tree *tree;
struct extent_io_tree *tree;
u64 start = (u64)page->index << PAGE_CACHE_SHIFT;
u64 found_start;
int found_level;
unsigned long len;
struct extent_buffer *eb;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
if (page->private == EXTENT_PAGE_PRIVATE)
goto out;
@ -230,16 +235,16 @@ static int btree_writepage_io_hook(struct page *page, u64 start, u64 end)
static int btree_writepage(struct page *page, struct writeback_control *wbc)
{
struct extent_map_tree *tree;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
return extent_write_full_page(tree, page, btree_get_extent, wbc);
}
static int btree_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct extent_map_tree *tree;
tree = &BTRFS_I(mapping->host)->extent_tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(mapping->host)->io_tree;
if (wbc->sync_mode == WB_SYNC_NONE) {
u64 num_dirty;
u64 start = 0;
@ -264,18 +269,20 @@ static int btree_writepages(struct address_space *mapping,
int btree_readpage(struct file *file, struct page *page)
{
struct extent_map_tree *tree;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
return extent_read_full_page(tree, page, btree_get_extent);
}
static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
{
struct extent_map_tree *tree;
struct extent_io_tree *tree;
struct extent_map_tree *map;
int ret;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
ret = try_release_extent_mapping(tree, page);
tree = &BTRFS_I(page->mapping->host)->io_tree;
map = &BTRFS_I(page->mapping->host)->extent_tree;
ret = try_release_extent_mapping(map, tree, page);
if (ret == 1) {
ClearPagePrivate(page);
set_page_private(page, 0);
@ -286,8 +293,8 @@ static int btree_releasepage(struct page *page, gfp_t unused_gfp_flags)
static void btree_invalidatepage(struct page *page, unsigned long offset)
{
struct extent_map_tree *tree;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
extent_invalidatepage(tree, page, offset);
btree_releasepage(page, GFP_NOFS);
}
@ -331,7 +338,7 @@ int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize)
buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
if (!buf)
return 0;
read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
buf, 0, 0);
free_extent_buffer(buf);
return ret;
@ -342,40 +349,39 @@ struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
{
struct extent_buffer *buf = NULL;
struct inode *btree_inode = root->fs_info->btree_inode;
struct extent_map_tree *extent_tree;
struct extent_io_tree *io_tree;
u64 end;
int ret;
extent_tree = &BTRFS_I(btree_inode)->extent_tree;
io_tree = &BTRFS_I(btree_inode)->io_tree;
buf = btrfs_find_create_tree_block(root, bytenr, blocksize);
if (!buf)
return NULL;
read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
buf, 0, 1);
read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, buf, 0, 1);
if (buf->flags & EXTENT_CSUM)
return buf;
end = buf->start + PAGE_CACHE_SIZE - 1;
if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
buf->flags |= EXTENT_CSUM;
return buf;
}
lock_extent(extent_tree, buf->start, end, GFP_NOFS);
lock_extent(io_tree, buf->start, end, GFP_NOFS);
if (test_range_bit(extent_tree, buf->start, end, EXTENT_CSUM, 1)) {
if (test_range_bit(io_tree, buf->start, end, EXTENT_CSUM, 1)) {
buf->flags |= EXTENT_CSUM;
goto out_unlock;
}
ret = csum_tree_block(root, buf, 1);
set_extent_bits(extent_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
set_extent_bits(io_tree, buf->start, end, EXTENT_CSUM, GFP_NOFS);
buf->flags |= EXTENT_CSUM;
out_unlock:
unlock_extent(extent_tree, buf->start, end, GFP_NOFS);
unlock_extent(io_tree, buf->start, end, GFP_NOFS);
return buf;
}
@ -385,7 +391,7 @@ int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
struct inode *btree_inode = root->fs_info->btree_inode;
if (btrfs_header_generation(buf) ==
root->fs_info->running_transaction->transid)
clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree,
clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree,
buf);
return 0;
}
@ -394,7 +400,7 @@ int wait_on_tree_block_writeback(struct btrfs_root *root,
struct extent_buffer *buf)
{
struct inode *btree_inode = root->fs_info->btree_inode;
wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->extent_tree,
wait_on_extent_buffer_writeback(&BTRFS_I(btree_inode)->io_tree,
buf);
return 0;
}
@ -659,20 +665,23 @@ struct btrfs_root *open_ctree(struct super_block *sb)
fs_info->btree_inode->i_nlink = 1;
fs_info->btree_inode->i_size = sb->s_bdev->bd_inode->i_size;
fs_info->btree_inode->i_mapping->a_ops = &btree_aops;
extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree,
fs_info->btree_inode->i_mapping,
GFP_NOFS);
BTRFS_I(fs_info->btree_inode)->extent_tree.ops = &btree_extent_map_ops;
extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree,
GFP_NOFS);
extent_map_tree_init(&fs_info->free_space_cache,
BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops;
extent_io_tree_init(&fs_info->free_space_cache,
fs_info->btree_inode->i_mapping, GFP_NOFS);
extent_map_tree_init(&fs_info->block_group_cache,
extent_io_tree_init(&fs_info->block_group_cache,
fs_info->btree_inode->i_mapping, GFP_NOFS);
extent_map_tree_init(&fs_info->pinned_extents,
extent_io_tree_init(&fs_info->pinned_extents,
fs_info->btree_inode->i_mapping, GFP_NOFS);
extent_map_tree_init(&fs_info->pending_del,
extent_io_tree_init(&fs_info->pending_del,
fs_info->btree_inode->i_mapping, GFP_NOFS);
extent_map_tree_init(&fs_info->extent_ins,
extent_io_tree_init(&fs_info->extent_ins,
fs_info->btree_inode->i_mapping, GFP_NOFS);
fs_info->do_barriers = 1;
fs_info->closing = 0;
@ -787,7 +796,7 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
if (!btrfs_test_opt(root, NOBARRIER))
blkdev_issue_flush(sb->s_bdev, NULL);
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, super);
ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
super->start, super->len);
if (!btrfs_test_opt(root, NOBARRIER))
@ -864,12 +873,12 @@ int close_ctree(struct btrfs_root *root)
filemap_write_and_wait(fs_info->btree_inode->i_mapping);
extent_map_tree_empty_lru(&fs_info->free_space_cache);
extent_map_tree_empty_lru(&fs_info->block_group_cache);
extent_map_tree_empty_lru(&fs_info->pinned_extents);
extent_map_tree_empty_lru(&fs_info->pending_del);
extent_map_tree_empty_lru(&fs_info->extent_ins);
extent_map_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->extent_tree);
extent_io_tree_empty_lru(&fs_info->free_space_cache);
extent_io_tree_empty_lru(&fs_info->block_group_cache);
extent_io_tree_empty_lru(&fs_info->pinned_extents);
extent_io_tree_empty_lru(&fs_info->pending_del);
extent_io_tree_empty_lru(&fs_info->extent_ins);
extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
truncate_inode_pages(fs_info->btree_inode->i_mapping, 0);
@ -892,13 +901,13 @@ int close_ctree(struct btrfs_root *root)
int btrfs_buffer_uptodate(struct extent_buffer *buf)
{
struct inode *btree_inode = buf->first_page->mapping->host;
return extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree, buf);
return extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf);
}
int btrfs_set_buffer_uptodate(struct extent_buffer *buf)
{
struct inode *btree_inode = buf->first_page->mapping->host;
return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->extent_tree,
return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree,
buf);
}
@ -914,7 +923,7 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
transid, root->fs_info->generation);
WARN_ON(1);
}
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, buf);
set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, buf);
}
void btrfs_throttle(struct btrfs_root *root)
@ -941,7 +950,7 @@ void btrfs_set_buffer_defrag(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
buf->start + buf->len - 1, EXTENT_DEFRAG, GFP_NOFS);
}
@ -949,7 +958,7 @@ void btrfs_set_buffer_defrag_done(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
set_extent_bits(&BTRFS_I(btree_inode)->extent_tree, buf->start,
set_extent_bits(&BTRFS_I(btree_inode)->io_tree, buf->start,
buf->start + buf->len - 1, EXTENT_DEFRAG_DONE,
GFP_NOFS);
}
@ -958,7 +967,7 @@ int btrfs_buffer_defrag(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
buf->start, buf->start + buf->len - 1, EXTENT_DEFRAG, 0);
}
@ -966,7 +975,7 @@ int btrfs_buffer_defrag_done(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
return test_range_bit(&BTRFS_I(btree_inode)->extent_tree,
return test_range_bit(&BTRFS_I(btree_inode)->io_tree,
buf->start, buf->start + buf->len - 1,
EXTENT_DEFRAG_DONE, 0);
}
@ -975,7 +984,7 @@ int btrfs_clear_buffer_defrag_done(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
buf->start, buf->start + buf->len - 1,
EXTENT_DEFRAG_DONE, GFP_NOFS);
}
@ -984,7 +993,7 @@ int btrfs_clear_buffer_defrag(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
return clear_extent_bits(&BTRFS_I(btree_inode)->extent_tree,
return clear_extent_bits(&BTRFS_I(btree_inode)->io_tree,
buf->start, buf->start + buf->len - 1,
EXTENT_DEFRAG, GFP_NOFS);
}
@ -993,10 +1002,10 @@ int btrfs_read_buffer(struct extent_buffer *buf)
{
struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root;
struct inode *btree_inode = root->fs_info->btree_inode;
return read_extent_buffer_pages(&BTRFS_I(btree_inode)->extent_tree,
return read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree,
buf, 0, 1);
}
static struct extent_map_ops btree_extent_map_ops = {
static struct extent_io_ops btree_extent_io_ops = {
.writepage_io_hook = btree_writepage_io_hook,
};

43
fs/btrfs/extent-tree.c
View File

@ -63,7 +63,7 @@ static int cache_block_group(struct btrfs_root *root,
int ret;
struct btrfs_key key;
struct extent_buffer *leaf;
struct extent_map_tree *free_space_cache;
struct extent_io_tree *free_space_cache;
int slot;
u64 last = 0;
u64 hole_size;
@ -158,7 +158,7 @@ struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
btrfs_fs_info *info,
u64 bytenr)
{
struct extent_map_tree *block_group_cache;
struct extent_io_tree *block_group_cache;
struct btrfs_block_group_cache *block_group = NULL;
u64 ptr;
u64 start;
@ -281,7 +281,7 @@ struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
int data, int owner)
{
struct btrfs_block_group_cache *cache;
struct extent_map_tree *block_group_cache;
struct extent_io_tree *block_group_cache;
struct btrfs_block_group_cache *found_group = NULL;
struct btrfs_fs_info *info = root->fs_info;
u64 used;
@ -951,7 +951,7 @@ fail:
int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
struct btrfs_root *root)
{
struct extent_map_tree *block_group_cache;
struct extent_io_tree *block_group_cache;
struct btrfs_block_group_cache *cache;
int ret;
int err = 0;
@ -1107,12 +1107,12 @@ static int update_pinned_extents(struct btrfs_root *root,
return 0;
}
int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy)
int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy)
{
u64 last = 0;
u64 start;
u64 end;
struct extent_map_tree *pinned_extents = &root->fs_info->pinned_extents;
struct extent_io_tree *pinned_extents = &root->fs_info->pinned_extents;
int ret;
while(1) {
@ -1128,12 +1128,12 @@ int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy)
int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_map_tree *unpin)
struct extent_io_tree *unpin)
{
u64 start;
u64 end;
int ret;
struct extent_map_tree *free_space_cache;
struct extent_io_tree *free_space_cache;
free_space_cache = &root->fs_info->free_space_cache;
while(1) {
@ -1329,8 +1329,8 @@ static int del_pending_extents(struct btrfs_trans_handle *trans, struct
int err = 0;
u64 start;
u64 end;
struct extent_map_tree *pending_del;
struct extent_map_tree *pinned_extents;
struct extent_io_tree *pending_del;
struct extent_io_tree *pinned_extents;
pending_del = &extent_root->fs_info->pending_del;
pinned_extents = &extent_root->fs_info->pinned_extents;
@ -1802,7 +1802,7 @@ struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
set_extent_dirty(&trans->transaction->dirty_pages, buf->start,
buf->start + buf->len - 1, GFP_NOFS);
set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->extent_tree,
set_extent_bits(&BTRFS_I(root->fs_info->btree_inode)->io_tree,
buf->start, buf->start + buf->len - 1,
EXTENT_CSUM, GFP_NOFS);
buf->flags |= EXTENT_CSUM;
@ -2166,7 +2166,7 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
unsigned long i;
struct page *page;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct file_ra_state *ra;
ra = kzalloc(sizeof(*ra), GFP_NOFS);
@ -2195,15 +2195,14 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
page_start = (u64)page->index << PAGE_CACHE_SHIFT;
page_end = page_start + PAGE_CACHE_SIZE - 1;
lock_extent(em_tree, page_start, page_end, GFP_NOFS);
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
delalloc_start = page_start;
existing_delalloc =
count_range_bits(&BTRFS_I(inode)->extent_tree,
&delalloc_start, page_end,
PAGE_CACHE_SIZE, EXTENT_DELALLOC);
existing_delalloc = count_range_bits(io_tree,
&delalloc_start, page_end,
PAGE_CACHE_SIZE, EXTENT_DELALLOC);
set_extent_delalloc(em_tree, page_start,
set_extent_delalloc(io_tree, page_start,
page_end, GFP_NOFS);
spin_lock(&root->fs_info->delalloc_lock);
@ -2211,7 +2210,7 @@ static int noinline relocate_inode_pages(struct inode *inode, u64 start,
existing_delalloc;
spin_unlock(&root->fs_info->delalloc_lock);
unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
set_page_dirty(page);
unlock_page(page);
page_cache_release(page);
@ -2379,7 +2378,7 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
u64 cur_byte;
u64 total_found;
struct btrfs_fs_info *info = root->fs_info;
struct extent_map_tree *block_group_cache;
struct extent_io_tree *block_group_cache;
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;
@ -2561,7 +2560,7 @@ int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
struct btrfs_block_group_cache *cache;
struct btrfs_block_group_item *item;
struct btrfs_fs_info *info = root->fs_info;
struct extent_map_tree *block_group_cache;
struct extent_io_tree *block_group_cache;
struct btrfs_key key;
struct extent_buffer *leaf;
int ret;
@ -2645,7 +2644,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
int bit;
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
struct extent_map_tree *block_group_cache;
struct extent_io_tree *block_group_cache;
struct btrfs_key key;
struct btrfs_key found_key;
struct extent_buffer *leaf;

3089
fs/btrfs/extent_io.c Normal file
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File diff suppressed because it is too large Load Diff

193
fs/btrfs/extent_io.h Normal file
View File

@ -0,0 +1,193 @@
#ifndef __EXTENTIO__
#define __EXTENTIO__
#include <linux/rbtree.h>
/* bits for the extent state */
#define EXTENT_DIRTY 1
#define EXTENT_WRITEBACK (1 << 1)
#define EXTENT_UPTODATE (1 << 2)
#define EXTENT_LOCKED (1 << 3)
#define EXTENT_NEW (1 << 4)
#define EXTENT_DELALLOC (1 << 5)
#define EXTENT_DEFRAG (1 << 6)
#define EXTENT_DEFRAG_DONE (1 << 7)
#define EXTENT_BUFFER_FILLED (1 << 8)
#define EXTENT_CSUM (1 << 9)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
/*
* page->private values. Every page that is controlled by the extent
* map has page->private set to one.
*/
#define EXTENT_PAGE_PRIVATE 1
#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
struct extent_io_ops {
int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
};
struct extent_io_tree {
struct rb_root state;
struct address_space *mapping;
u64 dirty_bytes;
rwlock_t lock;
struct extent_io_ops *ops;
spinlock_t lru_lock;
struct list_head buffer_lru;
int lru_size;
};
struct extent_state {
u64 start;
u64 end; /* inclusive */
int in_tree;
struct rb_node rb_node;
wait_queue_head_t wq;
atomic_t refs;
unsigned long state;
/* for use by the FS */
u64 private;
struct list_head list;
};
struct extent_buffer {
u64 start;
unsigned long len;
char *map_token;
char *kaddr;
unsigned long map_start;
unsigned long map_len;
struct page *first_page;
struct list_head lru;
atomic_t refs;
int flags;
};
struct extent_map_tree;
typedef struct extent_map *(get_extent_t)(struct inode *inode,
struct page *page,
size_t page_offset,
u64 start, u64 len,
int create);
void extent_io_tree_init(struct extent_io_tree *tree,
struct address_space *mapping, gfp_t mask);
void extent_io_tree_empty_lru(struct extent_io_tree *tree);
int try_release_extent_mapping(struct extent_map_tree *map,
struct extent_io_tree *tree, struct page *page);
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask);
int extent_read_full_page(struct extent_io_tree *tree, struct page *page,
get_extent_t *get_extent);
int __init extent_io_init(void);
void extent_io_exit(void);
u64 count_range_bits(struct extent_io_tree *tree,
u64 *start, u64 search_end,
u64 max_bytes, unsigned long bits);
int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
int bits, int filled);
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
int bits, gfp_t mask);
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
int bits, gfp_t mask);
int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end,
gfp_t mask);
int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
u64 *start_ret, u64 *end_ret, int bits);
int extent_invalidatepage(struct extent_io_tree *tree,
struct page *page, unsigned long offset);
int extent_write_full_page(struct extent_io_tree *tree, struct page *page,
get_extent_t *get_extent,
struct writeback_control *wbc);
int extent_writepages(struct extent_io_tree *tree,
struct address_space *mapping,
get_extent_t *get_extent,
struct writeback_control *wbc);
int extent_readpages(struct extent_io_tree *tree,
struct address_space *mapping,
struct list_head *pages, unsigned nr_pages,
get_extent_t get_extent);
int extent_prepare_write(struct extent_io_tree *tree,
struct inode *inode, struct page *page,
unsigned from, unsigned to, get_extent_t *get_extent);
int extent_commit_write(struct extent_io_tree *tree,
struct inode *inode, struct page *page,
unsigned from, unsigned to);
sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
get_extent_t *get_extent);
int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end);
int set_state_private(struct extent_io_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);
struct extent_buffer *alloc_extent_buffer(struct extent_io_tree *tree,
u64 start, unsigned long len,
struct page *page0,
gfp_t mask);
struct extent_buffer *find_extent_buffer(struct extent_io_tree *tree,
u64 start, unsigned long len,
gfp_t mask);
void free_extent_buffer(struct extent_buffer *eb);
int read_extent_buffer_pages(struct extent_io_tree *tree,
struct extent_buffer *eb, u64 start, int wait);
static inline void extent_buffer_get(struct extent_buffer *eb)
{
atomic_inc(&eb->refs);
}
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
unsigned long start,
unsigned long len);
void read_extent_buffer(struct extent_buffer *eb, void *dst,
unsigned long start,
unsigned long len);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
unsigned long start, unsigned long len);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
unsigned long dst_offset, unsigned long src_offset,
unsigned long len);
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
unsigned long src_offset, unsigned long len);
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
unsigned long src_offset, unsigned long len);
void memset_extent_buffer(struct extent_buffer *eb, char c,
unsigned long start, unsigned long len);
int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
struct extent_buffer *eb);
int clear_extent_buffer_dirty(struct extent_io_tree *tree,
struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_io_tree *tree,
struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb);
int extent_buffer_uptodate(struct extent_io_tree *tree,
struct extent_buffer *eb);
int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
unsigned long min_len, char **token, char **map,
unsigned long *map_start,
unsigned long *map_len, int km);
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
unsigned long min_len, char **token, char **map,
unsigned long *map_start,
unsigned long *map_len, int km);
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
#endif

3119
fs/btrfs/extent_map.c
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File diff suppressed because it is too large Load Diff

218
fs/btrfs/extent_map.h
View File

@ -3,215 +3,53 @@
#include <linux/rbtree.h>
#define EXTENT_MAP_LAST_BYTE (u64)-4
#define EXTENT_MAP_HOLE (u64)-3
#define EXTENT_MAP_INLINE (u64)-2
#define EXTENT_MAP_DELALLOC (u64)-1
/* bits for the extent state */
#define EXTENT_DIRTY 1
#define EXTENT_WRITEBACK (1 << 1)
#define EXTENT_UPTODATE (1 << 2)
#define EXTENT_LOCKED (1 << 3)
#define EXTENT_NEW (1 << 4)
#define EXTENT_DELALLOC (1 << 5)
#define EXTENT_DEFRAG (1 << 6)
#define EXTENT_DEFRAG_DONE (1 << 7)
#define EXTENT_BUFFER_FILLED (1 << 8)
#define EXTENT_CSUM (1 << 9)
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
struct extent_map {
struct rb_node rb_node;
/*
* page->private values. Every page that is controlled by the extent
* map has page->private set to one.
*/
#define EXTENT_PAGE_PRIVATE 1
#define EXTENT_PAGE_PRIVATE_FIRST_PAGE 3
struct extent_map_ops {
int (*fill_delalloc)(struct inode *inode, u64 start, u64 end);
int (*writepage_io_hook)(struct page *page, u64 start, u64 end);
int (*readpage_io_hook)(struct page *page, u64 start, u64 end);
int (*readpage_end_io_hook)(struct page *page, u64 start, u64 end);
void (*writepage_end_io_hook)(struct page *page, u64 start, u64 end);
/* all of these are in bytes */
u64 start;
u64 len;
u64 block_start;
unsigned long flags;
struct block_device *bdev;
atomic_t refs;
int in_tree;
};
struct extent_map_tree {
struct rb_root map;
struct rb_root state;
struct address_space *mapping;
u64 dirty_bytes;
rwlock_t lock;
struct extent_map_ops *ops;
spinlock_t lru_lock;
struct list_head buffer_lru;
int lru_size;
struct extent_map *last;
spinlock_t lock;
};
/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
struct extent_map {
u64 start;
u64 end; /* inclusive */
int in_tree;
struct rb_node rb_node;
/* block_start and block_end are in bytes */
u64 block_start;
u64 block_end; /* inclusive */
struct block_device *bdev;
atomic_t refs;
};
static inline u64 extent_map_end(struct extent_map *em)
{
if (em->start + em->len < em->start)
return (u64)-1;
return em->start + em->len;
}
/* note, this must start with the same fields as fs/extent_map.c:tree_entry */
struct extent_state {
u64 start;
u64 end; /* inclusive */
int in_tree;
struct rb_node rb_node;
wait_queue_head_t wq;
atomic_t refs;
unsigned long state;
static inline u64 extent_map_block_end(struct extent_map *em)
{
if (em->block_start + em->len < em->block_start)
return (u64)-1;
return em->block_start + em->len;
}
/* for use by the FS */
u64 private;
struct list_head list;
};
struct extent_buffer {
u64 start;
unsigned long len;
char *map_token;
char *kaddr;
unsigned long map_start;
unsigned long map_len;
struct page *first_page;
struct list_head lru;
atomic_t refs;
int flags;
};
typedef struct extent_map *(get_extent_t)(struct inode *inode,
struct page *page,
size_t page_offset,
u64 start, u64 end,
int create);
void extent_map_tree_init(struct extent_map_tree *tree,
struct address_space *mapping, gfp_t mask);
void extent_map_tree_empty_lru(struct extent_map_tree *tree);
void extent_map_tree_init(struct extent_map_tree *tree, gfp_t mask);
struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
u64 start, u64 end);
u64 start, u64 len);
int add_extent_mapping(struct extent_map_tree *tree,
struct extent_map *em);
int remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
int try_release_extent_mapping(struct extent_map_tree *tree, struct page *page);
int lock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
int unlock_extent(struct extent_map_tree *tree, u64 start, u64 end, gfp_t mask);
struct extent_map *alloc_extent_map(gfp_t mask);
void free_extent_map(struct extent_map *em);
int extent_read_full_page(struct extent_map_tree *tree, struct page *page,
get_extent_t *get_extent);
int __init extent_map_init(void);
void extent_map_exit(void);
u64 count_range_bits(struct extent_map_tree *tree,
u64 *start, u64 search_end,
u64 max_bytes, unsigned long bits);
int test_range_bit(struct extent_map_tree *tree, u64 start, u64 end,
int bits, int filled);
int clear_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
int bits, gfp_t mask);
int set_extent_bits(struct extent_map_tree *tree, u64 start, u64 end,
int bits, gfp_t mask);
int set_extent_uptodate(struct extent_map_tree *tree, u64 start, u64 end,
gfp_t mask);
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 clear_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 find_first_extent_bit(struct extent_map_tree *tree, u64 start,
u64 *start_ret, u64 *end_ret, int bits);
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,
get_extent_t *get_extent,
struct writeback_control *wbc);
int extent_writepages(struct extent_map_tree *tree,
struct address_space *mapping,
get_extent_t *get_extent,
struct writeback_control *wbc);
int extent_readpages(struct extent_map_tree *tree,
struct address_space *mapping,
struct list_head *pages, unsigned nr_pages,
get_extent_t get_extent);
int extent_prepare_write(struct extent_map_tree *tree,
struct inode *inode, struct page *page,
unsigned from, unsigned to, get_extent_t *get_extent);
int extent_commit_write(struct extent_map_tree *tree,
struct inode *inode, struct page *page,
unsigned from, unsigned to);
sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
get_extent_t *get_extent);
int set_range_dirty(struct extent_map_tree *tree, u64 start, u64 end);
int set_state_private(struct extent_map_tree *tree, u64 start, u64 private);
int get_state_private(struct extent_map_tree *tree, u64 start, u64 *private);
void set_page_extent_mapped(struct page *page);
struct extent_buffer *alloc_extent_buffer(struct extent_map_tree *tree,
u64 start, unsigned long len,
struct page *page0,
gfp_t mask);
struct extent_buffer *find_extent_buffer(struct extent_map_tree *tree,
u64 start, unsigned long len,
gfp_t mask);
void free_extent_buffer(struct extent_buffer *eb);
int read_extent_buffer_pages(struct extent_map_tree *tree,
struct extent_buffer *eb, u64 start, int wait);
static inline void extent_buffer_get(struct extent_buffer *eb)
{
atomic_inc(&eb->refs);
}
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv,
unsigned long start,
unsigned long len);
void read_extent_buffer(struct extent_buffer *eb, void *dst,
unsigned long start,
unsigned long len);
void write_extent_buffer(struct extent_buffer *eb, const void *src,
unsigned long start, unsigned long len);
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src,
unsigned long dst_offset, unsigned long src_offset,
unsigned long len);
void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
unsigned long src_offset, unsigned long len);
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset,
unsigned long src_offset, unsigned long len);
void memset_extent_buffer(struct extent_buffer *eb, char c,
unsigned long start, unsigned long len);
int wait_on_extent_buffer_writeback(struct extent_map_tree *tree,
struct extent_buffer *eb);
int clear_extent_buffer_dirty(struct extent_map_tree *tree,
struct extent_buffer *eb);
int set_extent_buffer_dirty(struct extent_map_tree *tree,
struct extent_buffer *eb);
int set_extent_buffer_uptodate(struct extent_map_tree *tree,
struct extent_buffer *eb);
int extent_buffer_uptodate(struct extent_map_tree *tree,
struct extent_buffer *eb);
int map_extent_buffer(struct extent_buffer *eb, unsigned long offset,
unsigned long min_len, char **token, char **map,
unsigned long *map_start,
unsigned long *map_len, int km);
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long offset,
unsigned long min_len, char **token, char **map,
unsigned long *map_start,
unsigned long *map_len, int km);
void unmap_extent_buffer(struct extent_buffer *eb, char *token, int km);
#endif

29
fs/btrfs/file.c
View File

@ -233,8 +233,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
int err = 0;
int i;
struct inode *inode = fdentry(file)->d_inode;
struct extent_map *em;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
u64 hint_byte;
u64 num_bytes;
u64 start_pos;
@ -242,11 +241,6 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
u64 end_pos = pos + write_bytes;
u64 inline_size;
loff_t isize = i_size_read(inode);
em = alloc_extent_map(GFP_NOFS);
if (!em)
return -ENOMEM;
em->bdev = inode->i_sb->s_bdev;
start_pos = pos & ~((u64)root->sectorsize - 1);
num_bytes = (write_bytes + pos - start_pos +
@ -254,7 +248,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
end_of_last_block = start_pos + num_bytes - 1;
lock_extent(em_tree, start_pos, end_of_last_block, GFP_NOFS);
lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
mutex_lock(&root->fs_info->fs_mutex);
trans = btrfs_start_transaction(root, 1);
if (!trans) {
@ -268,7 +262,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
if ((end_of_last_block & 4095) == 0) {
printk("strange end of last %Lu %zu %Lu\n", start_pos, write_bytes, end_of_last_block);
}
set_extent_uptodate(em_tree, start_pos, end_of_last_block, GFP_NOFS);
set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
/* FIXME...EIEIO, ENOSPC and more */
@ -293,6 +287,8 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
inode->i_ino,
last_pos_in_file,
0, 0, hole_size);
btrfs_drop_extent_cache(inode, last_pos_in_file,
last_pos_in_file + hole_size -1);
btrfs_check_file(root, inode);
}
if (err)
@ -320,12 +316,12 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
last_end += PAGE_CACHE_SIZE - 1;
if (start_pos < isize) {
u64 delalloc_start = start_pos;
existing_delalloc = count_range_bits(em_tree,
existing_delalloc = count_range_bits(io_tree,
&delalloc_start,
end_of_last_block, (u64)-1,
EXTENT_DELALLOC);
}
set_extent_delalloc(em_tree, start_pos, end_of_last_block,
set_extent_delalloc(io_tree, start_pos, end_of_last_block,
GFP_NOFS);
spin_lock(&root->fs_info->delalloc_lock);
root->fs_info->delalloc_bytes += (end_of_last_block + 1 -
@ -346,6 +342,7 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
inline_size -= start_pos;
err = insert_inline_extent(trans, root, inode, start_pos,
inline_size, pages, 0, num_pages);
btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1);
BUG_ON(err);
}
if (end_pos > isize) {
@ -356,8 +353,7 @@ failed:
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);
unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
return err;
}
@ -367,10 +363,15 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
while(1) {
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, end);
if (!em)
if (!em) {
spin_unlock(&em_tree->lock);
break;
}
remove_extent_mapping(em_tree, em);
spin_unlock(&em_tree->lock);
/* once for us */
free_extent_map(em);
/* once for the tree*/

175
fs/btrfs/inode.c
View File

@ -53,7 +53,7 @@ static struct inode_operations btrfs_file_inode_operations;
static struct address_space_operations btrfs_aops;
static struct address_space_operations btrfs_symlink_aops;
static struct file_operations btrfs_dir_file_operations;
static struct extent_map_ops btrfs_extent_map_ops;
static struct extent_io_ops btrfs_extent_io_ops;
static struct kmem_cache *btrfs_inode_cachep;
struct kmem_cache *btrfs_trans_handle_cachep;
@ -104,6 +104,8 @@ static int cow_file_range(struct inode *inode, u64 start, u64 end)
u64 num_bytes;
u64 cur_alloc_size;
u64 blocksize = root->sectorsize;
u64 orig_start = start;
u64 orig_num_bytes;
struct btrfs_key ins;
int ret;
@ -115,6 +117,7 @@ static int cow_file_range(struct inode *inode, u64 start, u64 end)
num_bytes = max(blocksize, num_bytes);
ret = btrfs_drop_extents(trans, root, inode,
start, start + num_bytes, start, &alloc_hint);
orig_num_bytes = num_bytes;
if (alloc_hint == EXTENT_MAP_INLINE)
goto out;
@ -138,6 +141,8 @@ static int cow_file_range(struct inode *inode, u64 start, u64 end)
alloc_hint = ins.objectid + ins.offset;
start += cur_alloc_size;
}
btrfs_drop_extent_cache(inode, orig_start,
orig_start + orig_num_bytes - 1);
btrfs_add_ordered_inode(inode);
out:
btrfs_end_transaction(trans, root);
@ -297,7 +302,7 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
int ret = 0;
struct inode *inode = page->mapping->host;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_csum_item *item;
struct btrfs_path *path = NULL;
u32 csum;
@ -317,7 +322,7 @@ int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
}
read_extent_buffer(path->nodes[0], &csum, (unsigned long)item,
BTRFS_CRC32_SIZE);
set_state_private(em_tree, start, csum);
set_state_private(io_tree, start, csum);
out:
if (path)
btrfs_free_path(path);
@ -329,17 +334,19 @@ int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
{
size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT);
struct inode *inode = page->mapping->host;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
char *kaddr;
u64 private;
int ret;
struct btrfs_root *root = BTRFS_I(inode)->root;
u32 csum = ~(u32)0;
unsigned long flags;
if (btrfs_test_opt(root, NODATASUM) ||
btrfs_test_flag(inode, NODATASUM))
return 0;
ret = get_state_private(em_tree, start, &private);
ret = get_state_private(io_tree, start, &private);
local_irq_save(flags);
kaddr = kmap_atomic(page, KM_IRQ0);
if (ret) {
@ -428,7 +435,7 @@ void btrfs_read_locked_inode(struct inode *inode)
switch (inode->i_mode & S_IFMT) {
case S_IFREG:
inode->i_mapping->a_ops = &btrfs_aops;
BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
inode->i_fop = &btrfs_file_operations;
inode->i_op = &btrfs_file_inode_operations;
break;
@ -873,7 +880,7 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page,
size_t zero_start)
{
char *kaddr;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_root *root = BTRFS_I(inode)->root;
u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
@ -884,12 +891,12 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page,
WARN_ON(!PageLocked(page));
set_page_extent_mapped(page);
lock_extent(em_tree, page_start, page_end, GFP_NOFS);
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
delalloc_start = page_start;
existing_delalloc = count_range_bits(&BTRFS_I(inode)->extent_tree,
existing_delalloc = count_range_bits(&BTRFS_I(inode)->io_tree,
&delalloc_start, page_end,
PAGE_CACHE_SIZE, EXTENT_DELALLOC);
set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start,
page_end, GFP_NOFS);
spin_lock(&root->fs_info->delalloc_lock);
@ -903,7 +910,7 @@ static int btrfs_cow_one_page(struct inode *inode, struct page *page,
kunmap(page);
}
set_page_dirty(page);
unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
return ret;
}
@ -961,7 +968,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
struct btrfs_trans_handle *trans;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
u64 mask = root->sectorsize - 1;
u64 pos = (inode->i_size + mask) & ~mask;
@ -986,7 +993,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
btrfs_truncate_page(inode->i_mapping, inode->i_size);
lock_extent(em_tree, pos, block_end, GFP_NOFS);
lock_extent(io_tree, pos, block_end, GFP_NOFS);
hole_size = block_end - hole_start;
mutex_lock(&root->fs_info->fs_mutex);
@ -1001,11 +1008,13 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
inode->i_ino,
hole_start, 0, 0,
hole_size);
btrfs_drop_extent_cache(inode, hole_start,
hole_size - 1);
btrfs_check_file(root, inode);
}
btrfs_end_transaction(trans, root);
mutex_unlock(&root->fs_info->fs_mutex);
unlock_extent(em_tree, pos, block_end, GFP_NOFS);
unlock_extent(io_tree, pos, block_end, GFP_NOFS);
if (err)
return err;
}
@ -1189,7 +1198,8 @@ 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,
extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_tree,
inode->i_mapping, GFP_NOFS);
return 0;
}
@ -1485,7 +1495,8 @@ 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,
extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->root = root;
@ -1672,9 +1683,10 @@ static int btrfs_create(struct inode *dir, struct dentry *dentry,
inode->i_mapping->a_ops = &btrfs_aops;
inode->i_fop = &btrfs_file_operations;
inode->i_op = &btrfs_file_inode_operations;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
}
dir->i_sb->s_dirt = 1;
btrfs_update_inode_block_group(trans, inode);
@ -1816,7 +1828,7 @@ out_unlock:
}
struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
size_t page_offset, u64 start, u64 end,
size_t page_offset, u64 start, u64 len,
int create)
{
int ret;
@ -1826,7 +1838,6 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
u64 extent_end = 0;
u64 objectid = inode->i_ino;
u32 found_type;
int failed_insert = 0;
struct btrfs_path *path;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_file_extent_item *item;
@ -1834,6 +1845,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
struct btrfs_key found_key;
struct extent_map *em = NULL;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_trans_handle *trans = NULL;
path = btrfs_alloc_path();
@ -1841,24 +1853,26 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
mutex_lock(&root->fs_info->fs_mutex);
again:
em = lookup_extent_mapping(em_tree, start, end);
spin_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
spin_unlock(&em_tree->lock);
if (em) {
if (em->start > start) {
printk("get_extent start %Lu em start %Lu\n",
start, em->start);
printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
start, len, em->start, em->len);
WARN_ON(1);
}
goto out;
}
em = alloc_extent_map(GFP_NOFS);
if (!em) {
em = alloc_extent_map(GFP_NOFS);
if (!em) {
err = -ENOMEM;
goto out;
}
em->start = EXTENT_MAP_HOLE;
em->end = EXTENT_MAP_HOLE;
err = -ENOMEM;
goto out;
}
em->start = EXTENT_MAP_HOLE;
em->len = (u64)-1;
em->bdev = inode->i_sb->s_bdev;
ret = btrfs_lookup_file_extent(trans, root, path,
objectid, start, trans != NULL);
@ -1893,28 +1907,25 @@ again:
if (start < extent_start || start >= extent_end) {
em->start = start;
if (start < extent_start) {
if (end < extent_start)
if (start + len <= extent_start)
goto not_found;
em->end = extent_end - 1;
em->len = extent_end - extent_start;
} else {
em->end = end;
em->len = len;
}
goto not_found_em;
}
bytenr = btrfs_file_extent_disk_bytenr(leaf, item);
if (bytenr == 0) {
em->start = extent_start;
em->end = extent_end - 1;
em->len = extent_end - extent_start;
em->block_start = EXTENT_MAP_HOLE;
em->block_end = EXTENT_MAP_HOLE;
goto insert;
}
bytenr += btrfs_file_extent_offset(leaf, item);
em->block_start = bytenr;
em->block_end = em->block_start +
btrfs_file_extent_num_bytes(leaf, item) - 1;
em->start = extent_start;
em->end = extent_end - 1;
em->len = extent_end - extent_start;
goto insert;
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
unsigned long ptr;
@ -1925,25 +1936,24 @@ again:
size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
path->slots[0]));
extent_end = (extent_start + size - 1) |
((u64)root->sectorsize - 1);
extent_end = (extent_start + size + root->sectorsize - 1) &
~((u64)root->sectorsize - 1);
if (start < extent_start || start >= extent_end) {
em->start = start;
if (start < extent_start) {
if (end < extent_start)
if (start + len <= extent_start)
goto not_found;
em->end = extent_end;
em->len = extent_end - extent_start;
} else {
em->end = end;
em->len = len;
}
goto not_found_em;
}
em->block_start = EXTENT_MAP_INLINE;
em->block_end = EXTENT_MAP_INLINE;
if (!page) {
em->start = extent_start;
em->end = extent_start + size - 1;
em->len = size;
goto out;
}
@ -1952,8 +1962,7 @@ again:
copy_size = min_t(u64, PAGE_CACHE_SIZE - page_offset,
size - extent_offset);
em->start = extent_start + extent_offset;
em->end = (em->start + copy_size -1) |
((u64)root->sectorsize -1);
em->len = copy_size;
map = kmap(page);
ptr = btrfs_file_extent_inline_start(item) + extent_offset;
if (create == 0 && !PageUptodate(page)) {
@ -1974,7 +1983,8 @@ again:
btrfs_mark_buffer_dirty(leaf);
}
kunmap(page);
set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
set_extent_uptodate(io_tree, em->start,
extent_map_end(em) - 1, GFP_NOFS);
goto insert;
} else {
printk("unkknown found_type %d\n", found_type);
@ -1982,33 +1992,29 @@ again:
}
not_found:
em->start = start;
em->end = end;
em->len = len;
not_found_em:
em->block_start = EXTENT_MAP_HOLE;
em->block_end = EXTENT_MAP_HOLE;
insert:
btrfs_release_path(root, path);
if (em->start > start || em->end < start) {
printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
if (em->start > start || extent_map_end(em) <= start) {
printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len);
err = -EIO;
goto out;
}
err = 0;
spin_lock(&em_tree->lock);
ret = add_extent_mapping(em_tree, em);
if (ret == -EEXIST) {
free_extent_map(em);
em = NULL;
if (0 && failed_insert == 1) {
btrfs_drop_extent_cache(inode, start, end);
}
failed_insert++;
if (failed_insert > 5) {
printk("failing to insert %Lu %Lu\n", start, end);
em = lookup_extent_mapping(em_tree, start, len);
if (!em) {
err = -EIO;
goto out;
printk("failing to insert %Lu %Lu\n", start, len);
}
goto again;
}
err = 0;
spin_unlock(&em_tree->lock);
out:
btrfs_free_path(path);
if (trans) {
@ -2032,14 +2038,14 @@ static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
int btrfs_readpage(struct file *file, struct page *page)
{
struct extent_map_tree *tree;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
return extent_read_full_page(tree, page, btrfs_get_extent);
}
static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
{
struct extent_map_tree *tree;
struct extent_io_tree *tree;
if (current->flags & PF_MEMALLOC) {
@ -2047,15 +2053,15 @@ static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
unlock_page(page);
return 0;
}
tree = &BTRFS_I(page->mapping->host)->extent_tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
}
static int btrfs_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct extent_map_tree *tree;
tree = &BTRFS_I(mapping->host)->extent_tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(mapping->host)->io_tree;
return extent_writepages(tree, mapping, btrfs_get_extent, wbc);
}
@ -2063,19 +2069,21 @@ static int
btrfs_readpages(struct file *file, struct address_space *mapping,
struct list_head *pages, unsigned nr_pages)
{
struct extent_map_tree *tree;
tree = &BTRFS_I(mapping->host)->extent_tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(mapping->host)->io_tree;
return extent_readpages(tree, mapping, pages, nr_pages,
btrfs_get_extent);
}
static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
{
struct extent_map_tree *tree;
struct extent_io_tree *tree;
struct extent_map_tree *map;
int ret;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
ret = try_release_extent_mapping(tree, page);
tree = &BTRFS_I(page->mapping->host)->io_tree;
map = &BTRFS_I(page->mapping->host)->extent_tree;
ret = try_release_extent_mapping(map, tree, page);
if (ret == 1) {
ClearPagePrivate(page);
set_page_private(page, 0);
@ -2086,9 +2094,9 @@ static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
static void btrfs_invalidatepage(struct page *page, unsigned long offset)
{
struct extent_map_tree *tree;
struct extent_io_tree *tree;
tree = &BTRFS_I(page->mapping->host)->extent_tree;
tree = &BTRFS_I(page->mapping->host)->io_tree;
extent_invalidatepage(tree, page, offset);
btrfs_releasepage(page, GFP_NOFS);
}
@ -2374,7 +2382,7 @@ unsigned long btrfs_force_ra(struct address_space *mapping,
int btrfs_defrag_file(struct file *file) {
struct inode *inode = fdentry(file)->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct page *page;
unsigned long last_index;
unsigned long ra_index = 0;
@ -2414,13 +2422,13 @@ int btrfs_defrag_file(struct file *file) {
page_start = (u64)page->index << PAGE_CACHE_SHIFT;
page_end = page_start + PAGE_CACHE_SIZE - 1;
lock_extent(em_tree, page_start, page_end, GFP_NOFS);
lock_extent(io_tree, page_start, page_end, GFP_NOFS);
delalloc_start = page_start;
existing_delalloc =
count_range_bits(&BTRFS_I(inode)->extent_tree,
count_range_bits(&BTRFS_I(inode)->io_tree,
&delalloc_start, page_end,
PAGE_CACHE_SIZE, EXTENT_DELALLOC);
set_extent_delalloc(em_tree, page_start,
set_extent_delalloc(io_tree, page_start,
page_end, GFP_NOFS);
spin_lock(&root->fs_info->delalloc_lock);
@ -2428,7 +2436,7 @@ int btrfs_defrag_file(struct file *file) {
existing_delalloc;
spin_unlock(&root->fs_info->delalloc_lock);
unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
set_page_dirty(page);
unlock_page(page);
page_cache_release(page);
@ -2842,9 +2850,10 @@ static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
inode->i_mapping->a_ops = &btrfs_aops;
inode->i_fop = &btrfs_file_operations;
inode->i_op = &btrfs_file_inode_operations;
extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS);
extent_io_tree_init(&BTRFS_I(inode)->io_tree,
inode->i_mapping, GFP_NOFS);
BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops;
}
dir->i_sb->s_dirt = 1;
btrfs_update_inode_block_group(trans, inode);
@ -2934,7 +2943,7 @@ static struct file_operations btrfs_dir_file_operations = {
#endif
};
static struct extent_map_ops btrfs_extent_map_ops = {
static struct extent_io_ops btrfs_extent_io_ops = {
.fill_delalloc = run_delalloc_range,
.writepage_io_hook = btrfs_writepage_io_hook,
.readpage_io_hook = btrfs_readpage_io_hook,

10
fs/btrfs/super.c
View File

@ -468,10 +468,15 @@ static int __init init_btrfs_fs(void)
err = btrfs_init_cachep();
if (err)
goto free_transaction_sys;
err = extent_map_init();
err = extent_io_init();
if (err)
goto free_cachep;
err = extent_map_init();
if (err)
goto free_extent_io;
err = register_filesystem(&btrfs_fs_type);
if (err)
goto free_extent_map;
@ -479,6 +484,8 @@ static int __init init_btrfs_fs(void)
free_extent_map:
extent_map_exit();
free_extent_io:
extent_io_exit();
free_cachep:
btrfs_destroy_cachep();
free_transaction_sys:
@ -492,6 +499,7 @@ static void __exit exit_btrfs_fs(void)
btrfs_exit_transaction_sys();
btrfs_destroy_cachep();
extent_map_exit();
extent_io_exit();
unregister_filesystem(&btrfs_fs_type);
btrfs_exit_sysfs();
}

8
fs/btrfs/transaction.c
View File

@ -70,7 +70,7 @@ static int join_transaction(struct btrfs_root *root)
INIT_LIST_HEAD(&cur_trans->pending_snapshots);
list_add_tail(&cur_trans->list, &root->fs_info->trans_list);
btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree);
extent_map_tree_init(&cur_trans->dirty_pages,
extent_io_tree_init(&cur_trans->dirty_pages,
root->fs_info->btree_inode->i_mapping,
GFP_NOFS);
} else {
@ -153,7 +153,7 @@ int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans,
int ret;
int err;
int werr = 0;
struct extent_map_tree *dirty_pages;
struct extent_io_tree *dirty_pages;
struct page *page;
struct inode *btree_inode = root->fs_info->btree_inode;
u64 start;
@ -610,7 +610,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
struct btrfs_transaction *cur_trans;
struct btrfs_transaction *prev_trans = NULL;
struct list_head dirty_fs_roots;
struct extent_map_tree *pinned_copy;
struct extent_io_tree *pinned_copy;
DEFINE_WAIT(wait);
int ret;
@ -639,7 +639,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
if (!pinned_copy)
return -ENOMEM;
extent_map_tree_init(pinned_copy,
extent_io_tree_init(pinned_copy,
root->fs_info->btree_inode->i_mapping, GFP_NOFS);
trans->transaction->in_commit = 1;

2
fs/btrfs/transaction.h
View File

@ -29,7 +29,7 @@ struct btrfs_transaction {
int use_count;
int commit_done;
struct list_head list;
struct extent_map_tree dirty_pages;
struct extent_io_tree dirty_pages;
unsigned long start_time;
struct btrfs_ordered_inode_tree ordered_inode_tree;
wait_queue_head_t writer_wait;