#include <linux/time.h>
#include <linux/init.h>
#include <linux/string.h>
-#include <linux/smp_lock.h>
#include <linux/backing-dev.h>
#include <linux/mpage.h>
#include <linux/swap.h>
#include <linux/writeback.h>
#include <linux/statfs.h>
#include <linux/compat.h>
-#include <linux/version.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
int err = 0;
int i;
struct inode *inode = fdentry(file)->d_inode;
- struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
- u64 hint_byte;
u64 num_bytes;
u64 start_pos;
u64 end_of_last_block;
root->sectorsize - 1) & ~((u64)root->sectorsize - 1);
end_of_last_block = start_pos + num_bytes - 1;
+ err = btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
+ if (err)
+ return err;
- lock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
- trans = btrfs_join_transaction(root, 1);
- if (!trans) {
- err = -ENOMEM;
- goto out_unlock;
- }
- btrfs_set_trans_block_group(trans, inode);
- hint_byte = 0;
-
- set_extent_uptodate(io_tree, start_pos, end_of_last_block, GFP_NOFS);
-
- /* check for reserved extents on each page, we don't want
- * to reset the delalloc bit on things that already have
- * extents reserved.
- */
- btrfs_set_extent_delalloc(inode, start_pos, end_of_last_block);
for (i = 0; i < num_pages; i++) {
struct page *p = pages[i];
SetPageUptodate(p);
}
if (end_pos > isize) {
i_size_write(inode, end_pos);
- btrfs_update_inode(trans, root, inode);
+ /* we've only changed i_size in ram, and we haven't updated
+ * the disk i_size. There is no need to log the inode
+ * at this time.
+ */
}
- err = btrfs_end_transaction(trans, root);
-out_unlock:
- unlock_extent(io_tree, start_pos, end_of_last_block, GFP_NOFS);
return err;
}
if (!split2)
split2 = alloc_extent_map(GFP_NOFS);
- spin_lock(&em_tree->lock);
+ write_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
if (!em) {
- spin_unlock(&em_tree->lock);
+ write_unlock(&em_tree->lock);
break;
}
flags = em->flags;
if (skip_pinned && test_bit(EXTENT_FLAG_PINNED, &em->flags)) {
- spin_unlock(&em_tree->lock);
- if (em->start <= start &&
- (!testend || em->start + em->len >= start + len)) {
+ if (testend && em->start + em->len >= start + len) {
free_extent_map(em);
+ write_unlock(&em_tree->lock);
break;
}
- if (start < em->start) {
- len = em->start - start;
- } else {
+ start = em->start + em->len;
+ if (testend)
len = start + len - (em->start + em->len);
- start = em->start + em->len;
- }
free_extent_map(em);
+ write_unlock(&em_tree->lock);
continue;
}
compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
free_extent_map(split);
split = NULL;
}
- spin_unlock(&em_tree->lock);
+ write_unlock(&em_tree->lock);
/* once for us */
free_extent_map(em);
return 0;
}
-int btrfs_check_file(struct btrfs_root *root, struct inode *inode)
-{
- return 0;
-#if 0
- struct btrfs_path *path;
- struct btrfs_key found_key;
- struct extent_buffer *leaf;
- struct btrfs_file_extent_item *extent;
- u64 last_offset = 0;
- int nritems;
- int slot;
- int found_type;
- int ret;
- int err = 0;
- u64 extent_end = 0;
-
- path = btrfs_alloc_path();
- ret = btrfs_lookup_file_extent(NULL, root, path, inode->i_ino,
- last_offset, 0);
- while (1) {
- nritems = btrfs_header_nritems(path->nodes[0]);
- if (path->slots[0] >= nritems) {
- ret = btrfs_next_leaf(root, path);
- if (ret)
- goto out;
- nritems = btrfs_header_nritems(path->nodes[0]);
- }
- slot = path->slots[0];
- leaf = path->nodes[0];
- btrfs_item_key_to_cpu(leaf, &found_key, slot);
- if (found_key.objectid != inode->i_ino)
- break;
- if (found_key.type != BTRFS_EXTENT_DATA_KEY)
- goto out;
-
- if (found_key.offset < last_offset) {
- WARN_ON(1);
- btrfs_print_leaf(root, leaf);
- printk(KERN_ERR "inode %lu found offset %llu "
- "expected %llu\n", inode->i_ino,
- (unsigned long long)found_key.offset,
- (unsigned long long)last_offset);
- err = 1;
- goto out;
- }
- extent = btrfs_item_ptr(leaf, slot,
- struct btrfs_file_extent_item);
- found_type = btrfs_file_extent_type(leaf, extent);
- if (found_type == BTRFS_FILE_EXTENT_REG) {
- extent_end = found_key.offset +
- btrfs_file_extent_num_bytes(leaf, extent);
- } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
- struct btrfs_item *item;
- item = btrfs_item_nr(leaf, slot);
- extent_end = found_key.offset +
- btrfs_file_extent_inline_len(leaf, extent);
- extent_end = (extent_end + root->sectorsize - 1) &
- ~((u64)root->sectorsize - 1);
- }
- last_offset = extent_end;
- path->slots[0]++;
- }
- if (0 && last_offset < inode->i_size) {
- WARN_ON(1);
- btrfs_print_leaf(root, leaf);
- printk(KERN_ERR "inode %lu found offset %llu size %llu\n",
- inode->i_ino, (unsigned long long)last_offset,
- (unsigned long long)inode->i_size);
- err = 1;
-
- }
-out:
- btrfs_free_path(path);
- return err;
-#endif
-}
-
/*
* this is very complex, but the basic idea is to drop all extents
* in the range start - end. hint_block is filled in with a block number
* 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 inline_limit, u64 *hint_byte)
+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 locked_end = end;
- u64 search_start = start;
- u64 leaf_start;
- u64 ram_bytes = 0;
- u64 orig_parent = 0;
- u64 disk_bytenr = 0;
- u8 compression;
- u8 encryption;
- u16 other_encoding = 0;
- u64 root_gen;
- u64 root_owner;
+ 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;
- btrfs_drop_extent_cache(inode, start, end - 1, 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;
- leaf_start = 0;
- root_gen = 0;
- root_owner = 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));
- root_gen = btrfs_header_generation(leaf);
- root_owner = btrfs_header_owner(leaf);
- leaf_start = leaf->start;
- }
-
- 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;
}
- orig_parent = path->nodes[0]->start;
- 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),
- orig_parent, root->root_key.objectid,
- trans->transid, inode->i_ino);
+ 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);
- 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);
- }
- }
- }
- /* 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);
+ memcpy(&new_key, &key, sizeof(new_key));
+ new_key.offset = end;
+ btrfs_set_item_key_safe(trans, root, path, &new_key);
- btrfs_release_path(root, path);
- ret = btrfs_insert_empty_item(trans, root, path, &ins,
- sizeof(*extent));
- BUG_ON(ret);
-
- 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_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;
+ }
- /*
- * 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_mark_buffer_dirty(path->nodes[0]);
-
- if (disk_bytenr != 0) {
- ret = btrfs_update_extent_ref(trans, root,
- disk_bytenr, orig_parent,
- leaf->start,
- root->root_key.objectid,
- trans->transid, ins.objectid);
+ 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);
- BUG_ON(ret);
+ 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;
}
- btrfs_release_path(root, path);
- if (disk_bytenr != 0)
- inode_add_bytes(inode, extent_end - end);
+ if (end == extent_end)
+ break;
+
+ 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),
- leaf_start, root_owner,
- root_gen, key.objectid, 0);
+ disk_bytenr, num_bytes, 0,
+ root->root_key.objectid,
+ key.objectid, key.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 > end) {
- unlock_extent(&BTRFS_I(inode)->io_tree, 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_check_file(root, inode);
+
+ 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 extent_offset;
+ u64 orig_offset;
u64 other_start;
u64 other_end;
- u64 split = start;
- u64 locked_end = end;
- u64 orig_parent;
- 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);
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;
+ orig_offset = key.offset - btrfs_file_extent_offset(leaf, fi);
+
+ 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);
+
+ 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,
+ split - key.offset);
- fi = btrfs_item_ptr(leaf, del_slot - 1,
+ fi = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_file_extent_item);
- btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
+
+ btrfs_set_file_extent_offset(leaf, fi, split - orig_offset);
btrfs_set_file_extent_num_bytes(leaf, fi,
- extent_end - key.offset);
+ 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 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)) {
+ 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);
-
- orig_parent = leaf->start;
- ret = btrfs_inc_extent_ref(trans, root, bytenr, num_bytes,
- orig_parent, root->root_key.objectid,
- trans->transid, inode->i_ino);
- 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, 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);
-
- if (orig_parent != leaf->start) {
- ret = btrfs_update_extent_ref(trans, root, bytenr,
- orig_parent, leaf->start,
- root->root_key.objectid,
- trans->transid, inode->i_ino);
+
+ 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);
}
-done:
- btrfs_mark_buffer_dirty(leaf);
- btrfs_release_path(root, path);
- if (split_end && split == start) {
- split = end;
- goto again;
+ 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 (locked_end > end) {
- unlock_extent(&BTRFS_I(inode)->io_tree, end, locked_end - 1,
- GFP_NOFS);
+ 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;
}
btrfs_put_ordered_extent(ordered);
clear_extent_bits(&BTRFS_I(inode)->io_tree, start_pos,
- last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC,
+ last_pos - 1, EXTENT_DIRTY | EXTENT_DELALLOC |
+ EXTENT_DO_ACCOUNTING,
GFP_NOFS);
unlock_extent(&BTRFS_I(inode)->io_tree,
start_pos, last_pos - 1, GFP_NOFS);
unsigned long last_index;
int will_write;
- will_write = ((file->f_flags & O_SYNC) || IS_SYNC(inode) ||
+ will_write = ((file->f_flags & O_DSYNC) || IS_SYNC(inode) ||
(file->f_flags & O_DIRECT));
nrptrs = min((count + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE,
start_pos = pos;
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+
+ /* do the reserve before the mutex lock in case we have to do some
+ * flushing. We wouldn't deadlock, but this is more polite.
+ */
+ err = btrfs_reserve_metadata_for_delalloc(root, inode, 1);
+ if (err)
+ goto out_nolock;
+
+ mutex_lock(&inode->i_mutex);
+
current->backing_dev_info = inode->i_mapping->backing_dev_info;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
- goto out_nolock;
+ goto out;
+
if (count == 0)
- goto out_nolock;
+ goto out;
err = file_remove_suid(file);
if (err)
- goto out_nolock;
+ goto out;
+
file_update_time(file);
pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
- mutex_lock(&inode->i_mutex);
+ /* generic_write_checks can change our pos */
+ start_pos = pos;
+
BTRFS_I(inode)->sequence++;
first_index = pos >> PAGE_CACHE_SHIFT;
last_index = (pos + count) >> PAGE_CACHE_SHIFT;
WARN_ON(num_pages > nrptrs);
memset(pages, 0, sizeof(struct page *) * nrptrs);
- ret = btrfs_check_free_space(root, write_bytes, 0);
+ ret = btrfs_check_data_free_space(root, inode, write_bytes);
if (ret)
goto out;
ret = prepare_pages(root, file, pages, num_pages,
pos, first_index, last_index,
write_bytes);
- if (ret)
+ if (ret) {
+ btrfs_free_reserved_data_space(root, inode,
+ write_bytes);
goto out;
+ }
ret = btrfs_copy_from_user(pos, num_pages,
write_bytes, pages, buf);
if (ret) {
+ btrfs_free_reserved_data_space(root, inode,
+ write_bytes);
btrfs_drop_pages(pages, num_pages);
goto out;
}
ret = dirty_and_release_pages(NULL, root, file, pages,
num_pages, pos, write_bytes);
btrfs_drop_pages(pages, num_pages);
- if (ret)
+ if (ret) {
+ btrfs_free_reserved_data_space(root, inode,
+ write_bytes);
goto out;
+ }
if (will_write) {
- btrfs_fdatawrite_range(inode->i_mapping, pos,
- pos + write_bytes - 1,
- WB_SYNC_NONE);
+ filemap_fdatawrite_range(inode->i_mapping, pos,
+ pos + write_bytes - 1);
} else {
balance_dirty_pages_ratelimited_nr(inode->i_mapping,
num_pages);
}
out:
mutex_unlock(&inode->i_mutex);
+ if (ret)
+ err = ret;
+ btrfs_unreserve_metadata_for_delalloc(root, inode, 1);
out_nolock:
kfree(pages);
page_cache_release(pinned[1]);
*ppos = pos;
+ /*
+ * we want to make sure fsync finds this change
+ * but we haven't joined a transaction running right now.
+ *
+ * Later on, someone is sure to update the inode and get the
+ * real transid recorded.
+ *
+ * We set last_trans now to the fs_info generation + 1,
+ * this will either be one more than the running transaction
+ * or the generation used for the next transaction if there isn't
+ * one running right now.
+ */
+ BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
+
if (num_written > 0 && will_write) {
struct btrfs_trans_handle *trans;
if (err)
num_written = err;
- if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
+ if ((file->f_flags & O_DSYNC) || IS_SYNC(inode)) {
trans = btrfs_start_transaction(root, 1);
ret = btrfs_log_dentry_safe(trans, root,
file->f_dentry);
if (ret == 0) {
- btrfs_sync_log(trans, root);
- btrfs_end_transaction(trans, root);
- } else {
+ ret = btrfs_sync_log(trans, root);
+ if (ret == 0)
+ btrfs_end_transaction(trans, root);
+ else
+ btrfs_commit_transaction(trans, root);
+ } else if (ret != BTRFS_NO_LOG_SYNC) {
btrfs_commit_transaction(trans, root);
+ } else {
+ btrfs_end_transaction(trans, root);
}
}
if (file->f_flags & O_DIRECT) {
int btrfs_release_file(struct inode *inode, struct file *filp)
{
+ /*
+ * ordered_data_close is set by settattr when we are about to truncate
+ * a file from a non-zero size to a zero size. This tries to
+ * flush down new bytes that may have been written if the
+ * application were using truncate to replace a file in place.
+ */
+ if (BTRFS_I(inode)->ordered_data_close) {
+ BTRFS_I(inode)->ordered_data_close = 0;
+ btrfs_add_ordered_operation(NULL, BTRFS_I(inode)->root, inode);
+ if (inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT)
+ filemap_flush(inode->i_mapping);
+ }
if (filp->private_data)
btrfs_ioctl_trans_end(filp);
return 0;
int ret = 0;
struct btrfs_trans_handle *trans;
+
+ /* we wait first, since the writeback may change the inode */
+ root->log_batch++;
+ /* the VFS called filemap_fdatawrite for us */
+ btrfs_wait_ordered_range(inode, 0, (u64)-1);
+ root->log_batch++;
+
/*
* check the transaction that last modified this inode
* and see if its already been committed
if (!BTRFS_I(inode)->last_trans)
goto out;
+ /*
+ * if the last transaction that changed this file was before
+ * the current transaction, we can bail out now without any
+ * syncing
+ */
mutex_lock(&root->fs_info->trans_mutex);
if (BTRFS_I(inode)->last_trans <=
root->fs_info->last_trans_committed) {
}
mutex_unlock(&root->fs_info->trans_mutex);
- root->fs_info->tree_log_batch++;
- filemap_fdatawrite(inode->i_mapping);
- btrfs_wait_ordered_range(inode, 0, (u64)-1);
- root->fs_info->tree_log_batch++;
-
/*
* ok we haven't committed the transaction yet, lets do a commit
*/
- if (file->private_data)
+ if (file && file->private_data)
btrfs_ioctl_trans_end(file);
trans = btrfs_start_transaction(root, 1);
goto out;
}
- ret = btrfs_log_dentry_safe(trans, root, file->f_dentry);
+ ret = btrfs_log_dentry_safe(trans, root, dentry);
if (ret < 0)
goto out;
* file again, but that will end up using the synchronization
* inside btrfs_sync_log to keep things safe.
*/
- mutex_unlock(&file->f_dentry->d_inode->i_mutex);
+ mutex_unlock(&dentry->d_inode->i_mutex);
- if (ret > 0) {
- ret = btrfs_commit_transaction(trans, root);
+ if (ret != BTRFS_NO_LOG_SYNC) {
+ if (ret > 0) {
+ ret = btrfs_commit_transaction(trans, root);
+ } else {
+ ret = btrfs_sync_log(trans, root);
+ if (ret == 0)
+ ret = btrfs_end_transaction(trans, root);
+ else
+ ret = btrfs_commit_transaction(trans, root);
+ }
} else {
- btrfs_sync_log(trans, root);
ret = btrfs_end_transaction(trans, root);
}
- mutex_lock(&file->f_dentry->d_inode->i_mutex);
+ mutex_lock(&dentry->d_inode->i_mutex);
out:
return ret > 0 ? EIO : ret;
}
-static struct vm_operations_struct btrfs_file_vm_ops = {
+static const struct vm_operations_struct btrfs_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = btrfs_page_mkwrite,
};
return 0;
}
-struct file_operations btrfs_file_operations = {
+const struct file_operations btrfs_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
.aio_read = generic_file_aio_read,