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Btrfs: Allow tails larger than one page 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2007-10-15 16:18:25 -04:00
parent 4dc119046d
commit 3326d1b07c
5 changed files with 155 additions and 55 deletions
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24
fs/btrfs/ctree.c
View File

@ -1766,8 +1766,9 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
/* first try to make some room by pushing left and right */
wret = push_leaf_left(trans, root, path, data_size);
if (wret < 0)
if (wret < 0) {
return wret;
}
if (wret) {
wret = push_leaf_right(trans, root, path, data_size);
if (wret < 0)
@ -1777,8 +1778,9 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
/* did the pushes work? */
if (btrfs_leaf_free_space(root, l) >=
sizeof(struct btrfs_item) + data_size)
sizeof(struct btrfs_item) + data_size) {
return 0;
}
if (!path->nodes[1]) {
ret = insert_new_root(trans, root, path, 1);
@ -1822,7 +1824,11 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
return ret;
}
mid = slot;
double_split = 1;
if (mid != nritems &&
leaf_space_used(l, mid, nritems - mid) +
space_needed > BTRFS_LEAF_DATA_SIZE(root)) {
double_split = 1;
}
}
} else {
if (leaf_space_used(l, 0, mid + 1) + space_needed >
@ -1910,8 +1916,9 @@ static int split_leaf(struct btrfs_trans_handle *trans, struct btrfs_root
BUG_ON(path->slots[0] < 0);
if (!double_split)
if (!double_split) {
return ret;
}
right = btrfs_alloc_free_block(trans, root, root->leafsize,
l->start, 0);
@ -2048,7 +2055,11 @@ int btrfs_extend_item(struct btrfs_trans_handle *trans,
old_data = btrfs_item_end_nr(leaf, slot);
BUG_ON(slot < 0);
BUG_ON(slot >= nritems);
if (slot >= nritems) {
btrfs_print_leaf(root, leaf);
printk("slot %d too large, nritems %d\n", slot, nritems);
BUG_ON(1);
}
/*
* item0..itemN ... dataN.offset..dataN.size .. data0.size
@ -2132,6 +2143,9 @@ int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
if (btrfs_leaf_free_space(root, leaf) <
sizeof(struct btrfs_item) + data_size) {
btrfs_print_leaf(root, leaf);
printk("not enough freespace need %u have %d\n",
data_size, btrfs_leaf_free_space(root, leaf));
BUG();
}

2
fs/btrfs/ctree.h
View File

@ -1137,7 +1137,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
extern struct file_operations btrfs_file_operations;
int btrfs_drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
u64 start, u64 end, u64 *hint_block);
u64 start, u64 end, u64 inline_end, u64 *hint_block);
/* tree-defrag.c */
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
struct btrfs_root *root, int cache_only);

150
fs/btrfs/file.c
View File

@ -82,8 +82,9 @@ static void btrfs_drop_pages(struct page **pages, size_t num_pages)
static int insert_inline_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
u64 offset, ssize_t size,
struct page *page, size_t page_offset)
u64 offset, size_t size,
struct page **pages, size_t page_offset,
int num_pages)
{
struct btrfs_key key;
struct btrfs_path *path;
@ -91,9 +92,12 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
char *kaddr;
unsigned long ptr;
struct btrfs_file_extent_item *ei;
struct page *page;
u32 datasize;
int err = 0;
int ret;
int i;
ssize_t cur_size;
path = btrfs_alloc_path();
if (!path)
@ -104,25 +108,97 @@ static int insert_inline_extent(struct btrfs_trans_handle *trans,
key.objectid = inode->i_ino;
key.offset = offset;
btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
BUG_ON(size >= PAGE_CACHE_SIZE);
datasize = btrfs_file_extent_calc_inline_size(size);
datasize = btrfs_file_extent_calc_inline_size(offset + size);
ret = btrfs_insert_empty_item(trans, root, path, &key,
datasize);
if (ret) {
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
if (ret < 0) {
err = ret;
goto fail;
}
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
btrfs_set_file_extent_generation(leaf, ei, trans->transid);
btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
ptr = btrfs_file_extent_inline_start(ei);
if (ret == 1) {
path->slots[0]--;
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
kaddr = kmap_atomic(page, KM_USER1);
write_extent_buffer(leaf, kaddr + page_offset, ptr, size);
kunmap_atomic(kaddr, KM_USER1);
if (btrfs_file_extent_type(leaf, ei) !=
BTRFS_FILE_EXTENT_INLINE) {
goto insert;
}
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
ret = 0;
}
if (ret == 0) {
u32 found_size;
u64 found_start;
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
if (btrfs_file_extent_type(leaf, ei) !=
BTRFS_FILE_EXTENT_INLINE) {
err = ret;
btrfs_print_leaf(root, leaf);
printk("found wasn't inline offset %Lu inode %lu\n",
offset, inode->i_ino);
goto fail;
}
found_start = key.offset;
found_size = btrfs_file_extent_inline_len(leaf,
btrfs_item_nr(leaf, path->slots[0]));
if (found_size < offset + size) {
btrfs_release_path(root, path);
ret = btrfs_search_slot(trans, root, &key, path,
offset + size - found_size -
found_start, 1);
BUG_ON(ret != 0);
ret = btrfs_extend_item(trans, root, path,
offset + size - found_size -
found_start);
if (ret) {
err = ret;
goto fail;
}
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
}
} else {
insert:
btrfs_release_path(root, path);
ret = btrfs_insert_empty_item(trans, root, path, &key,
datasize);
if (ret) {
err = ret;
printk("got bad ret %d\n", ret);
goto fail;
}
leaf = path->nodes[0];
ei = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
btrfs_set_file_extent_generation(leaf, ei, trans->transid);
btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE);
}
ptr = btrfs_file_extent_inline_start(ei) + offset;
cur_size = size;
i = 0;
while (size > 0) {
page = pages[i];
kaddr = kmap_atomic(page, KM_USER0);
cur_size = min(PAGE_CACHE_SIZE - page_offset, size);
write_extent_buffer(leaf, kaddr + page_offset, ptr, cur_size);
kunmap_atomic(kaddr, KM_USER0);
page_offset = 0;
ptr += cur_size;
size -= cur_size;
if (i >= num_pages) {
printk("i %d num_pages %d\n", i, num_pages);
}
i++;
}
btrfs_mark_buffer_dirty(leaf);
fail:
btrfs_free_path(path);
@ -193,6 +269,7 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
err = btrfs_drop_extents(trans, root, inode,
last_pos_in_file,
last_pos_in_file + hole_size,
last_pos_in_file,
&hint_byte);
if (err)
goto failed;
@ -210,11 +287,12 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
* either allocate an extent for the new bytes or setup the key
* to show we are doing inline data in the extent
*/
inline_size = end_pos - start_pos;
if (isize >= PAGE_CACHE_SIZE || pos + write_bytes < inode->i_size ||
inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
inline_size >= PAGE_CACHE_SIZE) {
inline_size = end_pos;
if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
inline_size > 16384 ||
inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
u64 last_end;
for (i = 0; i < num_pages; i++) {
struct page *p = pages[i];
SetPageUptodate(p);
@ -225,22 +303,18 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
set_extent_delalloc(em_tree, start_pos, end_of_last_block,
GFP_NOFS);
} else {
struct page *p = pages[0];
u64 aligned_end;
/* step one, delete the existing extents in this range */
aligned_end = (pos + write_bytes + root->sectorsize - 1) &
~((u64)root->sectorsize - 1);
err = btrfs_drop_extents(trans, root, inode, start_pos,
(pos + write_bytes + root->sectorsize -1) &
~((u64)root->sectorsize - 1), &hint_byte);
aligned_end, end_pos, &hint_byte);
if (err)
goto failed;
err = insert_inline_extent(trans, root, inode, start_pos,
end_pos - start_pos, p, 0);
end_pos - start_pos, pages, 0,
num_pages);
BUG_ON(err);
em->start = start_pos;
em->end = end_pos - 1;
em->block_start = EXTENT_MAP_INLINE;
em->block_end = EXTENT_MAP_INLINE;
add_extent_mapping(em_tree, em);
}
if (end_pos > isize) {
i_size_write(inode, end_pos);
@ -285,7 +359,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end)
*/
int btrfs_drop_extents(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct inode *inode,
u64 start, u64 end, u64 *hint_byte)
u64 start, u64 end, u64 inline_end, u64 *hint_byte)
{
int ret;
struct btrfs_key key;
@ -401,8 +475,8 @@ next_slot:
BUG_ON(ret);
}
}
WARN_ON(found_inline);
bookend = 1;
if (!found_inline)
bookend = 1;
}
/* truncate existing extent */
if (start > key.offset) {
@ -425,8 +499,14 @@ next_slot:
btrfs_set_file_extent_num_bytes(leaf, extent,
new_num);
btrfs_mark_buffer_dirty(leaf);
} else {
WARN_ON(1);
} else if (end > extent_end &&
key.offset < inline_end &&
inline_end < extent_end) {
u32 new_size;
new_size = btrfs_file_extent_calc_inline_size(
inline_end - key.offset);
btrfs_truncate_item(trans, root, path,
new_size);
}
}
/* delete the entire extent */

32
fs/btrfs/inode.c
View File

@ -87,7 +87,7 @@ static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
BUG_ON(!trans);
num_bytes = (end - start + blocksize) & ~(blocksize - 1);
ret = btrfs_drop_extents(trans, root, inode,
start, start + num_bytes, &alloc_hint);
start, start + num_bytes, start, &alloc_hint);
ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_bytes, 0,
alloc_hint, (u64)-1, &ins, 1);
@ -776,7 +776,8 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
trans = btrfs_start_transaction(root, 1);
btrfs_set_trans_block_group(trans, inode);
err = btrfs_drop_extents(trans, root, inode,
pos, pos + hole_size, &alloc_hint);
pos, pos + hole_size, pos,
&alloc_hint);
err = btrfs_insert_file_extent(trans, root, inode->i_ino,
pos, 0, 0, hole_size);
@ -1581,7 +1582,9 @@ again:
} else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
unsigned long ptr;
char *map;
u32 size;
size_t size;
size_t extent_offset;
size_t copy_size;
size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf,
path->slots[0]));
@ -1600,26 +1603,31 @@ again:
goto not_found_em;
}
extent_offset = (page->index << PAGE_CACHE_SHIFT) -
extent_start;
ptr = btrfs_file_extent_inline_start(item) + extent_offset;
map = kmap(page);
copy_size = min(PAGE_CACHE_SIZE - page_offset,
size - extent_offset);
em->block_start = EXTENT_MAP_INLINE;
em->block_end = EXTENT_MAP_INLINE;
em->start = extent_start;
em->end = extent_end;
em->start = extent_start + extent_offset;
em->end = (em->start + copy_size -1) |
((u64)root->sectorsize -1);
if (!page) {
goto insert;
}
ptr = btrfs_file_extent_inline_start(item);
map = kmap(page);
read_extent_buffer(leaf, map + page_offset, ptr, size);
read_extent_buffer(leaf, map + page_offset, ptr, copy_size);
/*
memset(map + page_offset + size, 0,
root->sectorsize - (page_offset + size));
memset(map + page_offset + copy_size, 0,
PAGE_CACHE_SIZE - copy_size - page_offset);
*/
flush_dcache_page(page);
kunmap(page);
set_extent_uptodate(em_tree, extent_start,
extent_end, GFP_NOFS);
set_extent_uptodate(em_tree, em->start, em->end, GFP_NOFS);
goto insert;
} else {
printk("unkknown found_type %d\n", found_type);

2
fs/btrfs/super.c
View File

@ -280,7 +280,6 @@ error_s:
error_bdev:
close_bdev_excl(bdev);
error:
printk("get_sb failed\n");
return error;
}
/* end copy & paste */
@ -295,7 +294,6 @@ static int btrfs_get_sb(struct file_system_type *fs_type,
ret = btrfs_get_sb_bdev(fs_type, flags, dev_name, data,
btrfs_fill_super, mnt,
subvol_name ? subvol_name : "default");
printk("btrfs_get_sb returns %d\n", ret);
return ret;
}