}
set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
- /* FIXME...EIEIO, ENOSPC and more */
- /* insert any holes we need to create */
- if (isize < start_pos) {
- u64 last_pos_in_file;
- u64 hole_size;
- u64 mask = root->sectorsize - 1;
- last_pos_in_file = (isize + mask) & ~mask;
- hole_size = (start_pos - last_pos_in_file + mask) & ~mask;
- if (hole_size > 0) {
- btrfs_wait_ordered_range(inode, last_pos_in_file,
- last_pos_in_file + hole_size);
- mutex_lock(&BTRFS_I(inode)->extent_mutex);
- 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;
-
- err = btrfs_insert_file_extent(trans, root,
- inode->i_ino,
- last_pos_in_file,
- 0, 0, hole_size, 0,
- hole_size, 0, 0, 0);
- btrfs_drop_extent_cache(inode, last_pos_in_file,
- last_pos_in_file + hole_size - 1, 0);
- mutex_unlock(&BTRFS_I(inode)->extent_mutex);
- btrfs_check_file(root, inode);
- }
- if (err)
- goto failed;
- }
-
/* check for reserved extents on each page, we don't want
* to reset the delalloc bit on things that already have
* extents reserved.
i_size_write(inode, end_pos);
btrfs_update_inode(trans, root, inode);
}
-failed:
err = btrfs_end_transaction(trans, root);
out_unlock:
unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
u64 start, u64 end, u64 inline_limit, u64 *hint_byte)
{
u64 extent_end = 0;
+ u64 locked_end = end;
u64 search_start = start;
u64 leaf_start;
u64 ram_bytes = 0;
- u8 compression = 0;
- u8 encryption = 0;
+ u64 orig_parent = 0;
+ u64 disk_bytenr = 0;
+ u8 compression;
+ u8 encryption;
u16 other_encoding = 0;
u64 root_gen;
u64 root_owner;
int keep;
int slot;
int bookend;
- int found_type;
+ int found_type = 0;
int found_extent;
int found_inline;
int recow;
leaf_start = 0;
root_gen = 0;
root_owner = 0;
+ compression = 0;
+ encryption = 0;
extent = NULL;
leaf = path->nodes[0];
slot = path->slots[0];
extent);
other_encoding = btrfs_file_extent_other_encoding(leaf,
extent);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
+ if (found_type == BTRFS_FILE_EXTENT_REG ||
+ found_type == BTRFS_FILE_EXTENT_PREALLOC) {
extent_end =
btrfs_file_extent_disk_bytenr(leaf,
extent);
goto next_slot;
}
- if (found_inline) {
- u64 mask = root->sectorsize - 1;
- search_start = (extent_end + mask) & ~mask;
- } else
- search_start = extent_end;
-
if (end <= extent_end && start >= key.offset && found_inline)
*hint_byte = EXTENT_MAP_INLINE;
if (found_inline && start <= key.offset)
keep = 1;
}
+
+ if (bookend && found_extent) {
+ if (locked_end < extent_end) {
+ ret = try_lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1,
+ GFP_NOFS);
+ if (!ret) {
+ btrfs_release_path(root, path);
+ lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1,
+ GFP_NOFS);
+ locked_end = extent_end;
+ continue;
+ }
+ locked_end = extent_end;
+ }
+ orig_parent = path->nodes[0]->start;
+ disk_bytenr = le64_to_cpu(old.disk_bytenr);
+ if (disk_bytenr != 0) {
+ ret = btrfs_inc_extent_ref(trans, root,
+ disk_bytenr,
+ le64_to_cpu(old.disk_num_bytes),
+ orig_parent, root->root_key.objectid,
+ trans->transid, inode->i_ino);
+ BUG_ON(ret);
+ }
+ }
+
+ if (found_inline) {
+ u64 mask = root->sectorsize - 1;
+ search_start = (extent_end + mask) & ~mask;
+ } else
+ search_start = extent_end;
+
/* truncate existing extent */
if (start > key.offset) {
u64 new_num;
inode_sub_bytes(inode, old_num -
new_num);
}
- btrfs_set_file_extent_num_bytes(leaf, extent,
- new_num);
+ if (!compression && !encryption) {
+ btrfs_set_file_extent_ram_bytes(leaf,
+ extent, new_num);
+ }
+ btrfs_set_file_extent_num_bytes(leaf,
+ extent, new_num);
btrfs_mark_buffer_dirty(leaf);
} else if (key.offset < inline_limit &&
(end > extent_end) &&
inline_limit - key.offset);
inode_sub_bytes(inode, extent_end -
inline_limit);
- btrfs_truncate_item(trans, root, path,
- new_size, 1);
+ btrfs_set_file_extent_ram_bytes(leaf, extent,
+ new_size);
+ if (!compression && !encryption) {
+ btrfs_truncate_item(trans, root, path,
+ new_size, 1);
+ }
}
}
/* delete the entire extent */
new_size = btrfs_file_extent_calc_inline_size(
extent_end - end);
inode_sub_bytes(inode, end - key.offset);
- ret = btrfs_truncate_item(trans, root, path,
- new_size, 0);
+ btrfs_set_file_extent_ram_bytes(leaf, extent,
+ new_size);
+ if (!compression && !encryption)
+ ret = btrfs_truncate_item(trans, root, path,
+ new_size, 0);
BUG_ON(ret);
}
/* create bookend, splitting the extent in two */
if (bookend && found_extent) {
- u64 disk_bytenr;
struct btrfs_key ins;
ins.objectid = inode->i_ino;
ins.offset = end;
btrfs_set_key_type(&ins, BTRFS_EXTENT_DATA_KEY);
+
btrfs_release_path(root, path);
ret = btrfs_insert_empty_item(trans, root, path, &ins,
sizeof(*extent));
*/
btrfs_set_file_extent_ram_bytes(leaf, extent,
ram_bytes);
- btrfs_set_file_extent_type(leaf, extent,
- BTRFS_FILE_EXTENT_REG);
+ btrfs_set_file_extent_type(leaf, extent, found_type);
btrfs_mark_buffer_dirty(path->nodes[0]);
- disk_bytenr = le64_to_cpu(old.disk_bytenr);
if (disk_bytenr != 0) {
- ret = btrfs_inc_extent_ref(trans, root,
- disk_bytenr,
- le64_to_cpu(old.disk_num_bytes),
- leaf->start,
+ ret = btrfs_update_extent_ref(trans, root,
+ disk_bytenr, orig_parent,
+ leaf->start,
root->root_key.objectid,
trans->transid, ins.objectid);
+
BUG_ON(ret);
}
btrfs_release_path(root, path);
}
out:
btrfs_free_path(path);
+ if (locked_end > end) {
+ unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1,
+ GFP_NOFS);
+ }
btrfs_check_file(root, inode);
return ret;
}
+static int extent_mergeable(struct extent_buffer *leaf, int slot,
+ u64 objectid, u64 bytenr, u64 *start, u64 *end)
+{
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_key key;
+ u64 extent_end;
+
+ if (slot < 0 || slot >= btrfs_header_nritems(leaf))
+ return 0;
+
+ btrfs_item_key_to_cpu(leaf, &key, slot);
+ if (key.objectid != objectid || key.type != BTRFS_EXTENT_DATA_KEY)
+ return 0;
+
+ fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
+ if (btrfs_file_extent_type(leaf, fi) != BTRFS_FILE_EXTENT_REG ||
+ btrfs_file_extent_disk_bytenr(leaf, fi) != bytenr ||
+ btrfs_file_extent_compression(leaf, fi) ||
+ btrfs_file_extent_encryption(leaf, fi) ||
+ btrfs_file_extent_other_encoding(leaf, fi))
+ return 0;
+
+ extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
+ if ((*start && *start != key.offset) || (*end && *end != extent_end))
+ return 0;
+
+ *start = key.offset;
+ *end = extent_end;
+ return 1;
+}
+
+/*
+ * Mark extent in the range start - end as written.
+ *
+ * This changes extent type from 'pre-allocated' to 'regular'. If only
+ * part of extent is marked as written, the extent will be split into
+ * two or three.
+ */
+int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode, u64 start, u64 end)
+{
+ struct extent_buffer *leaf;
+ struct btrfs_path *path;
+ struct btrfs_file_extent_item *fi;
+ struct btrfs_key key;
+ u64 bytenr;
+ u64 num_bytes;
+ u64 extent_end;
+ u64 extent_offset;
+ u64 other_start;
+ u64 other_end;
+ u64 split = start;
+ u64 locked_end = end;
+ int extent_type;
+ int split_end = 1;
+ int ret;
+
+ btrfs_drop_extent_cache(inode, start, end - 1, 0);
+
+ path = btrfs_alloc_path();
+ BUG_ON(!path);
+again:
+ key.objectid = inode->i_ino;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ if (split == start)
+ key.offset = split;
+ else
+ key.offset = split - 1;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret > 0 && path->slots[0] > 0)
+ path->slots[0]--;
+
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ BUG_ON(key.objectid != inode->i_ino ||
+ key.type != BTRFS_EXTENT_DATA_KEY);
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ extent_type = btrfs_file_extent_type(leaf, fi);
+ BUG_ON(extent_type != BTRFS_FILE_EXTENT_PREALLOC);
+ extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
+ BUG_ON(key.offset > start || extent_end < end);
+
+ bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
+ extent_offset = btrfs_file_extent_offset(leaf, fi);
+
+ if (key.offset == start)
+ split = end;
+
+ if (key.offset == start && extent_end == end) {
+ int del_nr = 0;
+ int del_slot = 0;
+ u64 leaf_owner = btrfs_header_owner(leaf);
+ u64 leaf_gen = btrfs_header_generation(leaf);
+ other_start = end;
+ other_end = 0;
+ if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ extent_end = other_end;
+ del_slot = path->slots[0] + 1;
+ del_nr++;
+ ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
+ leaf->start, leaf_owner,
+ leaf_gen, inode->i_ino, 0);
+ BUG_ON(ret);
+ }
+ other_start = 0;
+ other_end = start;
+ if (extent_mergeable(leaf, path->slots[0] - 1, inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ key.offset = other_start;
+ del_slot = path->slots[0];
+ del_nr++;
+ ret = btrfs_free_extent(trans, root, bytenr, num_bytes,
+ leaf->start, leaf_owner,
+ leaf_gen, inode->i_ino, 0);
+ BUG_ON(ret);
+ }
+ split_end = 0;
+ if (del_nr == 0) {
+ btrfs_set_file_extent_type(leaf, fi,
+ BTRFS_FILE_EXTENT_REG);
+ goto done;
+ }
+
+ fi = btrfs_item_ptr(leaf, del_slot - 1,
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ extent_end - key.offset);
+ btrfs_mark_buffer_dirty(leaf);
+
+ ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
+ BUG_ON(ret);
+ goto done;
+ } else if (split == start) {
+ if (locked_end < extent_end) {
+ ret = try_lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1, GFP_NOFS);
+ if (!ret) {
+ btrfs_release_path(root, path);
+ lock_extent(&BTRFS_I(inode)->io_tree,
+ locked_end, extent_end - 1, GFP_NOFS);
+ locked_end = extent_end;
+ goto again;
+ }
+ locked_end = extent_end;
+ }
+ btrfs_set_file_extent_num_bytes(leaf, fi, split - key.offset);
+ extent_offset += split - key.offset;
+ } else {
+ BUG_ON(key.offset != start);
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset +
+ split - key.offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - split);
+ key.offset = split;
+ btrfs_set_item_key_safe(trans, root, path, &key);
+ extent_end = split;
+ }
+
+ if (extent_end == end) {
+ split_end = 0;
+ extent_type = BTRFS_FILE_EXTENT_REG;
+ }
+ if (extent_end == end && split == start) {
+ other_start = end;
+ other_end = 0;
+ if (extent_mergeable(leaf, path->slots[0] + 1, inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ path->slots[0]++;
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ key.offset = split;
+ btrfs_set_item_key_safe(trans, root, path, &key);
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ other_end - split);
+ goto done;
+ }
+ }
+ if (extent_end == end && split == end) {
+ other_start = 0;
+ other_end = start;
+ if (extent_mergeable(leaf, path->slots[0] - 1 , inode->i_ino,
+ bytenr, &other_start, &other_end)) {
+ path->slots[0]--;
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_num_bytes(leaf, fi, extent_end -
+ other_start);
+ goto done;
+ }
+ }
+
+ btrfs_mark_buffer_dirty(leaf);
+ btrfs_release_path(root, path);
+
+ key.offset = start;
+ ret = btrfs_insert_empty_item(trans, root, path, &key, sizeof(*fi));
+ BUG_ON(ret);
+
+ leaf = path->nodes[0];
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_generation(leaf, fi, trans->transid);
+ btrfs_set_file_extent_type(leaf, fi, extent_type);
+ btrfs_set_file_extent_disk_bytenr(leaf, fi, bytenr);
+ btrfs_set_file_extent_disk_num_bytes(leaf, fi, num_bytes);
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - key.offset);
+ btrfs_set_file_extent_ram_bytes(leaf, fi, num_bytes);
+ btrfs_set_file_extent_compression(leaf, fi, 0);
+ btrfs_set_file_extent_encryption(leaf, fi, 0);
+ btrfs_set_file_extent_other_encoding(leaf, fi, 0);
+
+ ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes,
+ leaf->start, root->root_key.objectid,
+ trans->transid, inode->i_ino);
+ BUG_ON(ret);
+done:
+ btrfs_mark_buffer_dirty(leaf);
+ btrfs_release_path(root, path);
+ if (split_end && split == start) {
+ split = end;
+ goto again;
+ }
+ if (locked_end > end) {
+ unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1,
+ GFP_NOFS);
+ }
+ btrfs_free_path(path);
+ return 0;
+}
+
/*
* this gets pages into the page cache and locks them down, it also properly
* waits for data=ordered extents to finish before allowing the pages to be
start_pos = pos & ~((u64)root->sectorsize - 1);
last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;
+ if (start_pos > inode->i_size) {
+ err = btrfs_cont_expand(inode, start_pos);
+ if (err)
+ return err;
+ }
+
memset(pages, 0, num_pages * sizeof(struct page *));
again:
for (i = 0; i < num_pages; i++) {
git.openpandora.org / pandora-kernel.git / blobdiff