aboutsummaryrefslogtreecommitdiffstats
path: root/fs/btrfs/file.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/btrfs/file.c')
-rw-r--r--fs/btrfs/file.c263
1 files changed, 58 insertions, 205 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 69abbe1..0aa1543 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -95,153 +95,6 @@ static void noinline btrfs_drop_pages(struct page **pages, size_t num_pages)
}
}
-/* this does all the hard work for inserting an inline extent into
- * the btree. Any existing inline extent is extended as required to make room,
- * otherwise things are inserted as required into the btree
- */
-static int noinline insert_inline_extent(struct btrfs_trans_handle *trans,
- struct btrfs_root *root, struct inode *inode,
- u64 offset, size_t size,
- struct page **pages, size_t page_offset,
- int num_pages)
-{
- struct btrfs_key key;
- struct btrfs_path *path;
- struct extent_buffer *leaf;
- 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)
- return -ENOMEM;
-
- btrfs_set_trans_block_group(trans, inode);
-
- key.objectid = inode->i_ino;
- key.offset = offset;
- btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
-
- ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
- if (ret < 0) {
- err = ret;
- goto fail;
- }
- if (ret == 1) {
- struct btrfs_key found_key;
-
- if (path->slots[0] == 0)
- goto insert;
-
- path->slots[0]--;
- leaf = path->nodes[0];
- btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
-
- if (found_key.objectid != inode->i_ino)
- goto insert;
-
- if (found_key.type != BTRFS_EXTENT_DATA_KEY)
- goto insert;
- ei = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
-
- 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_end;
-
- 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_size = btrfs_file_extent_inline_len(leaf,
- btrfs_item_nr(leaf, path->slots[0]));
- found_end = key.offset + found_size;
-
- if (found_end < offset + size) {
- btrfs_release_path(root, path);
- ret = btrfs_search_slot(trans, root, &key, path,
- offset + size - found_end, 1);
- BUG_ON(ret != 0);
-
- ret = btrfs_extend_item(trans, root, path,
- offset + size - found_end);
- if (ret) {
- err = ret;
- goto fail;
- }
- leaf = path->nodes[0];
- ei = btrfs_item_ptr(leaf, path->slots[0],
- struct btrfs_file_extent_item);
- inode_add_bytes(inode, offset + size - found_end);
- }
- if (found_end < offset) {
- ptr = btrfs_file_extent_inline_start(ei) + found_size;
- memset_extent_buffer(leaf, 0, ptr, offset - found_end);
- }
- } else {
-insert:
- btrfs_release_path(root, path);
- datasize = offset + size - key.offset;
- inode_add_bytes(inode, datasize);
- datasize = btrfs_file_extent_calc_inline_size(datasize);
- 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 - key.offset;
-
- cur_size = size;
- i = 0;
- while (size > 0) {
- page = pages[i];
- kaddr = kmap_atomic(page, KM_USER0);
- cur_size = min_t(size_t, 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);
- return err;
-}
-
/*
* after copy_from_user, pages need to be dirtied and we need to make
* sure holes are created between the current EOF and the start of
@@ -267,8 +120,6 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
u64 start_pos;
u64 end_of_last_block;
u64 end_pos = pos + write_bytes;
- u64 inline_size;
- int did_inline = 0;
loff_t isize = i_size_read(inode);
start_pos = pos & ~((u64)root->sectorsize - 1);
@@ -314,7 +165,8 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
err = btrfs_insert_file_extent(trans, root,
inode->i_ino,
last_pos_in_file,
- 0, 0, hole_size, 0);
+ 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);
@@ -324,57 +176,19 @@ static int noinline dirty_and_release_pages(struct btrfs_trans_handle *trans,
goto failed;
}
- /*
- * either allocate an extent for the new bytes or setup the key
- * to show we are doing inline data in the extent
+ /* check for reserved extents on each page, we don't want
+ * to reset the delalloc bit on things that already have
+ * extents reserved.
*/
- inline_size = end_pos;
- if (isize >= BTRFS_MAX_INLINE_DATA_SIZE(root) ||
- inline_size > root->fs_info->max_inline ||
- (inline_size & (root->sectorsize -1)) == 0 ||
- inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
- /* 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);
- ClearPageChecked(p);
- set_page_dirty(p);
- }
- } else {
- u64 aligned_end;
- /* step one, delete the existing extents in this range */
- aligned_end = (pos + write_bytes + root->sectorsize - 1) &
- ~((u64)root->sectorsize - 1);
- mutex_lock(&BTRFS_I(inode)->extent_mutex);
- err = btrfs_drop_extents(trans, root, inode, start_pos,
- aligned_end, aligned_end, &hint_byte);
- if (err)
- goto failed;
- if (isize > inline_size)
- inline_size = min_t(u64, isize, aligned_end);
- inline_size -= start_pos;
- err = insert_inline_extent(trans, root, inode, start_pos,
- inline_size, pages, 0, num_pages);
- btrfs_drop_extent_cache(inode, start_pos, aligned_end - 1, 0);
- BUG_ON(err);
- mutex_unlock(&BTRFS_I(inode)->extent_mutex);
-
- /*
- * an ugly way to do all the prop accounting around
- * the page bits and mapping tags
- */
- set_page_writeback(pages[0]);
- end_page_writeback(pages[0]);
- did_inline = 1;
+ 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);
+ ClearPageChecked(p);
+ set_page_dirty(p);
}
if (end_pos > isize) {
i_size_write(inode, end_pos);
- if (did_inline)
- BTRFS_I(inode)->disk_i_size = end_pos;
btrfs_update_inode(trans, root, inode);
}
failed:
@@ -399,6 +213,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
int ret;
int testend = 1;
unsigned long flags;
+ int compressed = 0;
WARN_ON(end < start);
if (end == (u64)-1) {
@@ -434,6 +249,7 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
free_extent_map(em);
continue;
}
+ compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
clear_bit(EXTENT_FLAG_PINNED, &em->flags);
remove_extent_mapping(em_tree, em);
@@ -442,6 +258,12 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
split->start = em->start;
split->len = start - em->start;
split->block_start = em->block_start;
+
+ if (compressed)
+ split->block_len = em->block_len;
+ else
+ split->block_len = split->len;
+
split->bdev = em->bdev;
split->flags = flags;
ret = add_extent_mapping(em_tree, split);
@@ -459,7 +281,13 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
split->bdev = em->bdev;
split->flags = flags;
- split->block_start = em->block_start + diff;
+ if (compressed) {
+ split->block_len = em->block_len;
+ split->block_start = em->block_start;
+ } else {
+ split->block_len = split->len;
+ split->block_start = em->block_start + diff;
+ }
ret = add_extent_mapping(em_tree, split);
BUG_ON(ret);
@@ -533,7 +361,7 @@ int btrfs_check_file(struct btrfs_root *root, struct inode *inode)
struct btrfs_item *item;
item = btrfs_item_nr(leaf, slot);
extent_end = found_key.offset +
- btrfs_file_extent_inline_len(leaf, item);
+ btrfs_file_extent_inline_len(leaf, extent);
extent_end = (extent_end + root->sectorsize - 1) &
~((u64)root->sectorsize -1 );
}
@@ -573,6 +401,10 @@ int noinline btrfs_drop_extents(struct btrfs_trans_handle *trans,
u64 extent_end = 0;
u64 search_start = start;
u64 leaf_start;
+ u64 ram_bytes = 0;
+ u8 compression = 0;
+ u8 encryption = 0;
+ u16 other_encoding = 0;
u64 root_gen;
u64 root_owner;
struct extent_buffer *leaf;
@@ -589,6 +421,7 @@ int noinline btrfs_drop_extents(struct btrfs_trans_handle *trans,
int recow;
int ret;
+ inline_limit = 0;
btrfs_drop_extent_cache(inode, start, end - 1, 0);
path = btrfs_alloc_path();
@@ -637,6 +470,12 @@ next_slot:
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) {
extent_end =
btrfs_file_extent_disk_bytenr(leaf,
@@ -646,13 +485,13 @@ next_slot:
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) {
- struct btrfs_item *item;
- item = btrfs_item_nr(leaf, slot);
found_inline = 1;
extent_end = key.offset +
- btrfs_file_extent_inline_len(leaf, item);
+ btrfs_file_extent_inline_len(leaf, extent);
}
} else {
extent_end = search_start;
@@ -680,10 +519,9 @@ next_slot:
search_start = (extent_end + mask) & ~mask;
} else
search_start = extent_end;
- if (end <= extent_end && start >= key.offset && found_inline) {
+
+ if (end <= extent_end && start >= key.offset && found_inline)
*hint_byte = EXTENT_MAP_INLINE;
- goto out;
- }
if (found_extent) {
read_extent_buffer(leaf, &old, (unsigned long)extent,
@@ -770,12 +608,27 @@ next_slot:
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);
+
+ /*
+ * 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,
BTRFS_FILE_EXTENT_REG);