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Btrfs: Allow tails larger than one page

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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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150
fs/btrfs/file.c
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@@ -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 */