* If an extent intersects the range but is not entirely inside the range
* it is either truncated or split. Anything entirely inside the range
* is deleted from the tree.
- *
- * inline_limit is used to tell this code which offsets in the file to keep
- * if they contain inline extents.
*/
-noinline int btrfs_drop_extents(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode,
- u64 start, u64 end, u64 locked_end,
- u64 inline_limit, u64 *hint_byte, int drop_cache)
+int btrfs_drop_extents(struct btrfs_trans_handle *trans, struct inode *inode,
+ u64 start, u64 end, u64 *hint_byte, int drop_cache)
{
- u64 extent_end = 0;
- u64 search_start = start;
- u64 ram_bytes = 0;
- u64 disk_bytenr = 0;
- u64 orig_locked_end = locked_end;
- u8 compression;
- u8 encryption;
- u16 other_encoding = 0;
+ struct btrfs_root *root = BTRFS_I(inode)->root;
struct extent_buffer *leaf;
- struct btrfs_file_extent_item *extent;
+ struct btrfs_file_extent_item *fi;
struct btrfs_path *path;
struct btrfs_key key;
- struct btrfs_file_extent_item old;
- int keep;
- int slot;
- int bookend;
- int found_type = 0;
- int found_extent;
- int found_inline;
+ struct btrfs_key new_key;
+ u64 search_start = start;
+ u64 disk_bytenr = 0;
+ u64 num_bytes = 0;
+ u64 extent_offset = 0;
+ u64 extent_end = 0;
+ int del_nr = 0;
+ int del_slot = 0;
+ int extent_type;
int recow;
int ret;
- inline_limit = 0;
if (drop_cache)
btrfs_drop_extent_cache(inode, start, end - 1, 0);
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
+
while (1) {
recow = 0;
- btrfs_release_path(root, path);
ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino,
search_start, -1);
if (ret < 0)
- goto out;
- if (ret > 0) {
- if (path->slots[0] == 0) {
- ret = 0;
- goto out;
- }
- path->slots[0]--;
+ break;
+ if (ret > 0 && path->slots[0] > 0 && search_start == start) {
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
+ if (key.objectid == inode->i_ino &&
+ key.type == BTRFS_EXTENT_DATA_KEY)
+ path->slots[0]--;
}
+ ret = 0;
next_slot:
- keep = 0;
- bookend = 0;
- found_extent = 0;
- found_inline = 0;
- compression = 0;
- encryption = 0;
- extent = NULL;
leaf = path->nodes[0];
- slot = path->slots[0];
- ret = 0;
- btrfs_item_key_to_cpu(leaf, &key, slot);
- if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY &&
- key.offset >= end) {
- goto out;
- }
- if (btrfs_key_type(&key) > BTRFS_EXTENT_DATA_KEY ||
- key.objectid != inode->i_ino) {
- goto out;
- }
- if (recow) {
- search_start = max(key.offset, start);
- continue;
- }
- if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) {
- extent = btrfs_item_ptr(leaf, slot,
- struct btrfs_file_extent_item);
- found_type = btrfs_file_extent_type(leaf, extent);
- compression = btrfs_file_extent_compression(leaf,
- extent);
- encryption = btrfs_file_extent_encryption(leaf,
- extent);
- other_encoding = btrfs_file_extent_other_encoding(leaf,
- extent);
- if (found_type == BTRFS_FILE_EXTENT_REG ||
- found_type == BTRFS_FILE_EXTENT_PREALLOC) {
- extent_end =
- btrfs_file_extent_disk_bytenr(leaf,
- extent);
- if (extent_end)
- *hint_byte = extent_end;
-
- extent_end = key.offset +
- btrfs_file_extent_num_bytes(leaf, extent);
- ram_bytes = btrfs_file_extent_ram_bytes(leaf,
- extent);
- found_extent = 1;
- } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- found_inline = 1;
- extent_end = key.offset +
- btrfs_file_extent_inline_len(leaf, extent);
+ if (path->slots[0] >= btrfs_header_nritems(leaf)) {
+ BUG_ON(del_nr > 0);
+ ret = btrfs_next_leaf(root, path);
+ if (ret < 0)
+ break;
+ if (ret > 0) {
+ ret = 0;
+ break;
}
+ leaf = path->nodes[0];
+ recow = 1;
+ }
+
+ btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
+ if (key.objectid > inode->i_ino ||
+ key.type > BTRFS_EXTENT_DATA_KEY || key.offset >= end)
+ break;
+
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+ extent_type = btrfs_file_extent_type(leaf, fi);
+
+ if (extent_type == BTRFS_FILE_EXTENT_REG ||
+ extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
+ disk_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);
+ extent_end = key.offset +
+ btrfs_file_extent_num_bytes(leaf, fi);
+ } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
+ extent_end = key.offset +
+ btrfs_file_extent_inline_len(leaf, fi);
} else {
+ WARN_ON(1);
extent_end = search_start;
}
- /* we found nothing we can drop */
- if ((!found_extent && !found_inline) ||
- search_start >= extent_end) {
- int nextret;
- u32 nritems;
- nritems = btrfs_header_nritems(leaf);
- if (slot >= nritems - 1) {
- nextret = btrfs_next_leaf(root, path);
- if (nextret)
- goto out;
- recow = 1;
- } else {
- path->slots[0]++;
- }
+ if (extent_end <= search_start) {
+ path->slots[0]++;
goto next_slot;
}
- if (end <= extent_end && start >= key.offset && found_inline)
- *hint_byte = EXTENT_MAP_INLINE;
-
- if (found_extent) {
- read_extent_buffer(leaf, &old, (unsigned long)extent,
- sizeof(old));
- }
-
- if (end < extent_end && end >= key.offset) {
- bookend = 1;
- if (found_inline && start <= key.offset)
- keep = 1;
+ search_start = max(key.offset, start);
+ if (recow) {
+ btrfs_release_path(root, path);
+ continue;
}
- 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;
+ /*
+ * | - range to drop - |
+ * | -------- extent -------- |
+ */
+ if (start > key.offset && end < extent_end) {
+ BUG_ON(del_nr > 0);
+ BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
+
+ memcpy(&new_key, &key, sizeof(new_key));
+ new_key.offset = start;
+ ret = btrfs_duplicate_item(trans, root, path,
+ &new_key);
+ if (ret == -EAGAIN) {
+ btrfs_release_path(root, path);
+ continue;
}
- disk_bytenr = le64_to_cpu(old.disk_bytenr);
- if (disk_bytenr != 0) {
+ if (ret < 0)
+ break;
+
+ leaf = path->nodes[0];
+ fi = btrfs_item_ptr(leaf, path->slots[0] - 1,
+ struct btrfs_file_extent_item);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ start - key.offset);
+
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+
+ extent_offset += start - key.offset;
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ extent_end - start);
+ btrfs_mark_buffer_dirty(leaf);
+
+ if (disk_bytenr > 0) {
ret = btrfs_inc_extent_ref(trans, root,
- disk_bytenr,
- le64_to_cpu(old.disk_num_bytes), 0,
- root->root_key.objectid,
- key.objectid, key.offset -
- le64_to_cpu(old.offset));
+ disk_bytenr, num_bytes, 0,
+ root->root_key.objectid,
+ new_key.objectid,
+ start - extent_offset);
BUG_ON(ret);
+ *hint_byte = disk_bytenr;
}
+ key.offset = start;
}
+ /*
+ * | ---- range to drop ----- |
+ * | -------- extent -------- |
+ */
+ if (start <= key.offset && end < extent_end) {
+ BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
+
+ memcpy(&new_key, &key, sizeof(new_key));
+ new_key.offset = end;
+ btrfs_set_item_key_safe(trans, root, path, &new_key);
- 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;
- u64 old_num;
- keep = 1;
- WARN_ON(start & (root->sectorsize - 1));
- if (found_extent) {
- new_num = start - key.offset;
- old_num = btrfs_file_extent_num_bytes(leaf,
- extent);
- *hint_byte =
- btrfs_file_extent_disk_bytenr(leaf,
- extent);
- if (btrfs_file_extent_disk_bytenr(leaf,
- extent)) {
- inode_sub_bytes(inode, old_num -
- 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 < extent_end)) {
- u32 new_size;
- new_size = btrfs_file_extent_calc_inline_size(
- inline_limit - key.offset);
- inode_sub_bytes(inode, extent_end -
- inline_limit);
- btrfs_set_file_extent_ram_bytes(leaf, extent,
- new_size);
- if (!compression && !encryption) {
- btrfs_truncate_item(trans, root, path,
- new_size, 1);
- }
+ extent_offset += end - key.offset;
+ btrfs_set_file_extent_offset(leaf, fi, extent_offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ extent_end - end);
+ btrfs_mark_buffer_dirty(leaf);
+ if (disk_bytenr > 0) {
+ inode_sub_bytes(inode, end - key.offset);
+ *hint_byte = disk_bytenr;
}
+ break;
}
- /* delete the entire extent */
- if (!keep) {
- if (found_inline)
- inode_sub_bytes(inode, extent_end -
- key.offset);
- ret = btrfs_del_item(trans, root, path);
- /* TODO update progress marker and return */
- BUG_ON(ret);
- extent = NULL;
- btrfs_release_path(root, path);
- /* the extent will be freed later */
- }
- if (bookend && found_inline && start <= key.offset) {
- u32 new_size;
- new_size = btrfs_file_extent_calc_inline_size(
- extent_end - end);
- inode_sub_bytes(inode, end - key.offset);
- 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) {
- 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);
- path->leave_spinning = 1;
- ret = btrfs_insert_empty_item(trans, root, path, &ins,
- sizeof(*extent));
- BUG_ON(ret);
+ search_start = extent_end;
+ /*
+ * | ---- range to drop ----- |
+ * | -------- extent -------- |
+ */
+ if (start > key.offset && end >= extent_end) {
+ BUG_ON(del_nr > 0);
+ BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE);
- leaf = path->nodes[0];
- extent = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
- write_extent_buffer(leaf, &old,
- (unsigned long)extent, sizeof(old));
-
- btrfs_set_file_extent_compression(leaf, extent,
- compression);
- btrfs_set_file_extent_encryption(leaf, extent,
- encryption);
- btrfs_set_file_extent_other_encoding(leaf, extent,
- other_encoding);
- btrfs_set_file_extent_offset(leaf, extent,
- le64_to_cpu(old.offset) + end - key.offset);
- WARN_ON(le64_to_cpu(old.num_bytes) <
- (extent_end - end));
- btrfs_set_file_extent_num_bytes(leaf, extent,
- extent_end - end);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ start - key.offset);
+ btrfs_mark_buffer_dirty(leaf);
+ if (disk_bytenr > 0) {
+ inode_sub_bytes(inode, extent_end - start);
+ *hint_byte = disk_bytenr;
+ }
+ if (end == extent_end)
+ break;
- /*
- * set the ram bytes to the size of the full extent
- * before splitting. This is a worst case flag,
- * but its the best we can do because we don't know
- * how splitting affects compression
- */
- btrfs_set_file_extent_ram_bytes(leaf, extent,
- ram_bytes);
- btrfs_set_file_extent_type(leaf, extent, found_type);
-
- btrfs_unlock_up_safe(path, 1);
- btrfs_mark_buffer_dirty(path->nodes[0]);
- btrfs_set_lock_blocking(path->nodes[0]);
-
- path->leave_spinning = 0;
- btrfs_release_path(root, path);
- if (disk_bytenr != 0)
- inode_add_bytes(inode, extent_end - end);
+ path->slots[0]++;
+ goto next_slot;
}
- if (found_extent && !keep) {
- u64 old_disk_bytenr = le64_to_cpu(old.disk_bytenr);
+ /*
+ * | ---- range to drop ----- |
+ * | ------ extent ------ |
+ */
+ if (start <= key.offset && end >= extent_end) {
+ if (del_nr == 0) {
+ del_slot = path->slots[0];
+ del_nr = 1;
+ } else {
+ BUG_ON(del_slot + del_nr != path->slots[0]);
+ del_nr++;
+ }
- if (old_disk_bytenr != 0) {
+ if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
inode_sub_bytes(inode,
- le64_to_cpu(old.num_bytes));
+ extent_end - key.offset);
+ extent_end = ALIGN(extent_end,
+ root->sectorsize);
+ } else if (disk_bytenr > 0) {
ret = btrfs_free_extent(trans, root,
- old_disk_bytenr,
- le64_to_cpu(old.disk_num_bytes),
- 0, root->root_key.objectid,
+ disk_bytenr, num_bytes, 0,
+ root->root_key.objectid,
key.objectid, key.offset -
- le64_to_cpu(old.offset));
+ extent_offset);
BUG_ON(ret);
- *hint_byte = old_disk_bytenr;
+ inode_sub_bytes(inode,
+ extent_end - key.offset);
+ *hint_byte = disk_bytenr;
}
- }
- if (search_start >= end) {
- ret = 0;
- goto out;
+ if (end == extent_end)
+ break;
+
+ if (path->slots[0] + 1 < btrfs_header_nritems(leaf)) {
+ path->slots[0]++;
+ goto next_slot;
+ }
+
+ ret = btrfs_del_items(trans, root, path, del_slot,
+ del_nr);
+ BUG_ON(ret);
+
+ del_nr = 0;
+ del_slot = 0;
+
+ btrfs_release_path(root, path);
+ continue;
}
+
+ BUG_ON(1);
}
-out:
- btrfs_free_path(path);
- if (locked_end > orig_locked_end) {
- unlock_extent(&BTRFS_I(inode)->io_tree, orig_locked_end,
- locked_end - 1, GFP_NOFS);
+
+ if (del_nr > 0) {
+ ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
+ BUG_ON(ret);
}
+
+ btrfs_free_path(path);
return ret;
}
* 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 btrfs_root *root = BTRFS_I(inode)->root;
struct extent_buffer *leaf;
struct btrfs_path *path;
struct btrfs_file_extent_item *fi;
struct btrfs_key key;
+ struct btrfs_key new_key;
u64 bytenr;
u64 num_bytes;
u64 extent_end;
u64 orig_offset;
u64 other_start;
u64 other_end;
- u64 split = start;
- u64 locked_end = end;
- int extent_type;
- int split_end = 1;
+ u64 split;
+ int del_nr = 0;
+ int del_slot = 0;
int ret;
btrfs_drop_extent_cache(inode, start, end - 1, 0);
path = btrfs_alloc_path();
BUG_ON(!path);
again:
+ split = start;
key.objectid = inode->i_ino;
key.type = BTRFS_EXTENT_DATA_KEY;
- if (split == start)
- key.offset = split;
- else
- key.offset = split - 1;
+ key.offset = split;
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
if (ret > 0 && path->slots[0] > 0)
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);
+ BUG_ON(btrfs_file_extent_type(leaf, fi) !=
+ BTRFS_FILE_EXTENT_PREALLOC);
extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi);
BUG_ON(key.offset > start || extent_end < end);
num_bytes = btrfs_file_extent_disk_num_bytes(leaf, fi);
orig_offset = key.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;
- 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,
- 0, root->root_key.objectid,
- inode->i_ino, orig_offset);
- 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,
- 0, root->root_key.objectid,
- inode->i_ino, orig_offset);
- BUG_ON(ret);
- }
- split_end = 0;
- if (del_nr == 0) {
- btrfs_set_file_extent_type(leaf, fi,
- BTRFS_FILE_EXTENT_REG);
- goto done;
+ while (start > key.offset || end < extent_end) {
+ if (key.offset == start)
+ split = end;
+
+ memcpy(&new_key, &key, sizeof(new_key));
+ new_key.offset = split;
+ ret = btrfs_duplicate_item(trans, root, path, &new_key);
+ if (ret == -EAGAIN) {
+ btrfs_release_path(root, path);
+ goto again;
}
+ BUG_ON(ret < 0);
- fi = btrfs_item_ptr(leaf, del_slot - 1,
+ leaf = path->nodes[0];
+ fi = btrfs_item_ptr(leaf, path->slots[0] - 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);
+ split - key.offset);
+
+ fi = btrfs_item_ptr(leaf, path->slots[0],
+ struct btrfs_file_extent_item);
+
+ btrfs_set_file_extent_offset(leaf, fi, split - orig_offset);
+ btrfs_set_file_extent_num_bytes(leaf, fi,
+ extent_end - split);
btrfs_mark_buffer_dirty(leaf);
- ret = btrfs_del_items(trans, root, path, del_slot, del_nr);
+ ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
+ root->root_key.objectid,
+ inode->i_ino, orig_offset);
BUG_ON(ret);
- goto release;
- } 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);
- } else {
- BUG_ON(key.offset != start);
- key.offset = split;
- btrfs_set_file_extent_offset(leaf, fi, key.offset -
- orig_offset);
- btrfs_set_file_extent_num_bytes(leaf, fi, extent_end - 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, key.offset -
- orig_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)) {
+ if (split == start) {
+ key.offset = start;
+ } else {
+ BUG_ON(start != key.offset);
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;
+ extent_end = end;
}
}
- btrfs_mark_buffer_dirty(leaf);
-
- ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes, 0,
- root->root_key.objectid,
- inode->i_ino, orig_offset);
- BUG_ON(ret);
- 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, key.offset - orig_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);
-done:
- btrfs_mark_buffer_dirty(leaf);
-release:
- btrfs_release_path(root, path);
- if (split_end && split == start) {
- split = end;
- goto again;
+ 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,
+ 0, root->root_key.objectid,
+ inode->i_ino, orig_offset);
+ BUG_ON(ret);
}
- if (locked_end > end) {
- unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1,
- GFP_NOFS);
+ 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,
+ 0, root->root_key.objectid,
+ inode->i_ino, orig_offset);
+ BUG_ON(ret);
}
+ if (del_nr == 0) {
+ btrfs_set_file_extent_type(leaf, fi,
+ BTRFS_FILE_EXTENT_REG);
+ btrfs_mark_buffer_dirty(leaf);
+ goto out;
+ }
+
+ 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);
+out:
btrfs_free_path(path);
return 0;
}
projects / openwrt / staging / blogic.git / commitdiff