/*
* always compress this one file
*/
- unsigned force_compress:1;
+ unsigned force_compress:4;
struct inode vfs_inode;
};
/* number of bytes on disk */
unsigned long compressed_len;
+ /* the compression algorithm for this bio */
+ int compress_type;
+
/* number of compressed pages in the array */
unsigned long nr_pages;
/* ok, we're the last bio for this extent, lets start
* the decompression.
*/
- ret = btrfs_zlib_decompress_biovec(cb->compressed_pages,
- cb->start,
- cb->orig_bio->bi_io_vec,
- cb->orig_bio->bi_vcnt,
- cb->compressed_len);
+ ret = btrfs_decompress_biovec(cb->compress_type,
+ cb->compressed_pages,
+ cb->start,
+ cb->orig_bio->bi_io_vec,
+ cb->orig_bio->bi_vcnt,
+ cb->compressed_len);
csum_failed:
if (ret)
cb->errors = 1;
cb->len = uncompressed_len;
cb->compressed_len = compressed_len;
+ cb->compress_type = extent_compress_type(bio_flags);
cb->orig_bio = bio;
nr_pages = (compressed_len + PAGE_CACHE_SIZE - 1) /
bio_put(comp_bio);
return 0;
}
+
+static struct list_head comp_idle_workspace[BTRFS_COMPRESS_TYPES];
+static spinlock_t comp_workspace_lock[BTRFS_COMPRESS_TYPES];
+static int comp_num_workspace[BTRFS_COMPRESS_TYPES];
+static atomic_t comp_alloc_workspace[BTRFS_COMPRESS_TYPES];
+static wait_queue_head_t comp_workspace_wait[BTRFS_COMPRESS_TYPES];
+
+struct btrfs_compress_op *btrfs_compress_op[] = {
+ &btrfs_zlib_compress,
+};
+
+int __init btrfs_init_compress(void)
+{
+ int i;
+
+ for (i = 0; i < BTRFS_COMPRESS_TYPES; i++) {
+ INIT_LIST_HEAD(&comp_idle_workspace[i]);
+ spin_lock_init(&comp_workspace_lock[i]);
+ atomic_set(&comp_alloc_workspace[i], 0);
+ init_waitqueue_head(&comp_workspace_wait[i]);
+ }
+ return 0;
+}
+
+/*
+ * this finds an available workspace or allocates a new one
+ * ERR_PTR is returned if things go bad.
+ */
+static struct list_head *find_workspace(int type)
+{
+ struct list_head *workspace;
+ int cpus = num_online_cpus();
+ int idx = type - 1;
+
+ struct list_head *idle_workspace = &comp_idle_workspace[idx];
+ spinlock_t *workspace_lock = &comp_workspace_lock[idx];
+ atomic_t *alloc_workspace = &comp_alloc_workspace[idx];
+ wait_queue_head_t *workspace_wait = &comp_workspace_wait[idx];
+ int *num_workspace = &comp_num_workspace[idx];
+again:
+ spin_lock(workspace_lock);
+ if (!list_empty(idle_workspace)) {
+ workspace = idle_workspace->next;
+ list_del(workspace);
+ (*num_workspace)--;
+ spin_unlock(workspace_lock);
+ return workspace;
+
+ }
+ if (atomic_read(alloc_workspace) > cpus) {
+ DEFINE_WAIT(wait);
+
+ spin_unlock(workspace_lock);
+ prepare_to_wait(workspace_wait, &wait, TASK_UNINTERRUPTIBLE);
+ if (atomic_read(alloc_workspace) > cpus && !*num_workspace)
+ schedule();
+ finish_wait(workspace_wait, &wait);
+ goto again;
+ }
+ atomic_inc(alloc_workspace);
+ spin_unlock(workspace_lock);
+
+ workspace = btrfs_compress_op[idx]->alloc_workspace();
+ if (IS_ERR(workspace)) {
+ atomic_dec(alloc_workspace);
+ wake_up(workspace_wait);
+ }
+ return workspace;
+}
+
+/*
+ * put a workspace struct back on the list or free it if we have enough
+ * idle ones sitting around
+ */
+static void free_workspace(int type, struct list_head *workspace)
+{
+ int idx = type - 1;
+ struct list_head *idle_workspace = &comp_idle_workspace[idx];
+ spinlock_t *workspace_lock = &comp_workspace_lock[idx];
+ atomic_t *alloc_workspace = &comp_alloc_workspace[idx];
+ wait_queue_head_t *workspace_wait = &comp_workspace_wait[idx];
+ int *num_workspace = &comp_num_workspace[idx];
+
+ spin_lock(workspace_lock);
+ if (*num_workspace < num_online_cpus()) {
+ list_add_tail(workspace, idle_workspace);
+ (*num_workspace)++;
+ spin_unlock(workspace_lock);
+ goto wake;
+ }
+ spin_unlock(workspace_lock);
+
+ btrfs_compress_op[idx]->free_workspace(workspace);
+ atomic_dec(alloc_workspace);
+wake:
+ if (waitqueue_active(workspace_wait))
+ wake_up(workspace_wait);
+}
+
+/*
+ * cleanup function for module exit
+ */
+static void free_workspaces(void)
+{
+ struct list_head *workspace;
+ int i;
+
+ for (i = 0; i < BTRFS_COMPRESS_TYPES; i++) {
+ while (!list_empty(&comp_idle_workspace[i])) {
+ workspace = comp_idle_workspace[i].next;
+ list_del(workspace);
+ btrfs_compress_op[i]->free_workspace(workspace);
+ atomic_dec(&comp_alloc_workspace[i]);
+ }
+ }
+}
+
+/*
+ * given an address space and start/len, compress the bytes.
+ *
+ * pages are allocated to hold the compressed result and stored
+ * in 'pages'
+ *
+ * out_pages is used to return the number of pages allocated. There
+ * may be pages allocated even if we return an error
+ *
+ * total_in is used to return the number of bytes actually read. It
+ * may be smaller then len if we had to exit early because we
+ * ran out of room in the pages array or because we cross the
+ * max_out threshold.
+ *
+ * total_out is used to return the total number of compressed bytes
+ *
+ * max_out tells us the max number of bytes that we're allowed to
+ * stuff into pages
+ */
+int btrfs_compress_pages(int type, struct address_space *mapping,
+ u64 start, unsigned long len,
+ struct page **pages,
+ unsigned long nr_dest_pages,
+ unsigned long *out_pages,
+ unsigned long *total_in,
+ unsigned long *total_out,
+ unsigned long max_out)
+{
+ struct list_head *workspace;
+ int ret;
+
+ workspace = find_workspace(type);
+ if (IS_ERR(workspace))
+ return -1;
+
+ ret = btrfs_compress_op[type-1]->compress_pages(workspace, mapping,
+ start, len, pages,
+ nr_dest_pages, out_pages,
+ total_in, total_out,
+ max_out);
+ free_workspace(type, workspace);
+ return ret;
+}
+
+/*
+ * pages_in is an array of pages with compressed data.
+ *
+ * disk_start is the starting logical offset of this array in the file
+ *
+ * bvec is a bio_vec of pages from the file that we want to decompress into
+ *
+ * vcnt is the count of pages in the biovec
+ *
+ * srclen is the number of bytes in pages_in
+ *
+ * The basic idea is that we have a bio that was created by readpages.
+ * The pages in the bio are for the uncompressed data, and they may not
+ * be contiguous. They all correspond to the range of bytes covered by
+ * the compressed extent.
+ */
+int btrfs_decompress_biovec(int type, struct page **pages_in, u64 disk_start,
+ struct bio_vec *bvec, int vcnt, size_t srclen)
+{
+ struct list_head *workspace;
+ int ret;
+
+ workspace = find_workspace(type);
+ if (IS_ERR(workspace))
+ return -ENOMEM;
+
+ ret = btrfs_compress_op[type-1]->decompress_biovec(workspace, pages_in,
+ disk_start,
+ bvec, vcnt, srclen);
+ free_workspace(type, workspace);
+ return ret;
+}
+
+/*
+ * a less complex decompression routine. Our compressed data fits in a
+ * single page, and we want to read a single page out of it.
+ * start_byte tells us the offset into the compressed data we're interested in
+ */
+int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
+ unsigned long start_byte, size_t srclen, size_t destlen)
+{
+ struct list_head *workspace;
+ int ret;
+
+ workspace = find_workspace(type);
+ if (IS_ERR(workspace))
+ return -ENOMEM;
+
+ ret = btrfs_compress_op[type-1]->decompress(workspace, data_in,
+ dest_page, start_byte,
+ srclen, destlen);
+
+ free_workspace(type, workspace);
+ return ret;
+}
+
+void __exit btrfs_exit_compress(void)
+{
+ free_workspaces();
+}
#ifndef __BTRFS_COMPRESSION_
#define __BTRFS_COMPRESSION_
-int btrfs_zlib_decompress(unsigned char *data_in,
- struct page *dest_page,
- unsigned long start_byte,
- size_t srclen, size_t destlen);
-int btrfs_zlib_compress_pages(struct address_space *mapping,
- u64 start, unsigned long len,
- struct page **pages,
- unsigned long nr_dest_pages,
- unsigned long *out_pages,
- unsigned long *total_in,
- unsigned long *total_out,
- unsigned long max_out);
-int btrfs_zlib_decompress_biovec(struct page **pages_in,
- u64 disk_start,
- struct bio_vec *bvec,
- int vcnt,
- size_t srclen);
-void btrfs_zlib_exit(void);
+int btrfs_init_compress(void);
+void btrfs_exit_compress(void);
+
+int btrfs_compress_pages(int type, struct address_space *mapping,
+ u64 start, unsigned long len,
+ struct page **pages,
+ unsigned long nr_dest_pages,
+ unsigned long *out_pages,
+ unsigned long *total_in,
+ unsigned long *total_out,
+ unsigned long max_out);
+int btrfs_decompress_biovec(int type, struct page **pages_in, u64 disk_start,
+ struct bio_vec *bvec, int vcnt, size_t srclen);
+int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
+ unsigned long start_byte, size_t srclen, size_t destlen);
+
int btrfs_submit_compressed_write(struct inode *inode, u64 start,
unsigned long len, u64 disk_start,
unsigned long compressed_len,
unsigned long nr_pages);
int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio,
int mirror_num, unsigned long bio_flags);
+
+struct btrfs_compress_op {
+ struct list_head *(*alloc_workspace)(void);
+
+ void (*free_workspace)(struct list_head *workspace);
+
+ int (*compress_pages)(struct list_head *workspace,
+ struct address_space *mapping,
+ u64 start, unsigned long len,
+ struct page **pages,
+ unsigned long nr_dest_pages,
+ unsigned long *out_pages,
+ unsigned long *total_in,
+ unsigned long *total_out,
+ unsigned long max_out);
+
+ int (*decompress_biovec)(struct list_head *workspace,
+ struct page **pages_in,
+ u64 disk_start,
+ struct bio_vec *bvec,
+ int vcnt,
+ size_t srclen);
+
+ int (*decompress)(struct list_head *workspace,
+ unsigned char *data_in,
+ struct page *dest_page,
+ unsigned long start_byte,
+ size_t srclen, size_t destlen);
+};
+
+extern struct btrfs_compress_op btrfs_zlib_compress;
+
#endif
} __attribute__ ((__packed__));
enum btrfs_compression_type {
- BTRFS_COMPRESS_NONE = 0,
- BTRFS_COMPRESS_ZLIB = 1,
- BTRFS_COMPRESS_LAST = 2,
+ BTRFS_COMPRESS_NONE = 0,
+ BTRFS_COMPRESS_ZLIB = 1,
+ BTRFS_COMPRESS_TYPES = 1,
+ BTRFS_COMPRESS_LAST = 2,
};
struct btrfs_inode_item {
*/
u64 last_trans_log_full_commit;
u64 open_ioctl_trans;
- unsigned long mount_opt;
+ unsigned long mount_opt:20;
+ unsigned long compress_type:4;
u64 max_inline;
u64 alloc_start;
struct btrfs_transaction *running_transaction;
BUG_ON(extent_map_end(em) <= cur);
BUG_ON(end < cur);
- if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags))
+ if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
this_bio_flag = EXTENT_BIO_COMPRESSED;
+ extent_set_compress_type(&this_bio_flag,
+ em->compress_type);
+ }
iosize = min(extent_map_end(em) - cur, end - cur + 1);
cur_end = min(extent_map_end(em) - 1, end);
#define EXTENT_IOBITS (EXTENT_LOCKED | EXTENT_WRITEBACK)
#define EXTENT_CTLBITS (EXTENT_DO_ACCOUNTING | EXTENT_FIRST_DELALLOC)
-/* flags for bio submission */
+/*
+ * flags for bio submission. The high bits indicate the compression
+ * type for this bio
+ */
#define EXTENT_BIO_COMPRESSED 1
+#define EXTENT_BIO_FLAG_SHIFT 16
/* these are bit numbers for test/set bit */
#define EXTENT_BUFFER_UPTODATE 0
wait_queue_head_t lock_wq;
};
+static inline void extent_set_compress_type(unsigned long *bio_flags,
+ int compress_type)
+{
+ *bio_flags |= compress_type << EXTENT_BIO_FLAG_SHIFT;
+}
+
+static inline int extent_compress_type(unsigned long bio_flags)
+{
+ return bio_flags >> EXTENT_BIO_FLAG_SHIFT;
+}
+
struct extent_map_tree;
static inline struct extent_state *extent_state_next(struct extent_state *state)
#include <linux/module.h>
#include <linux/spinlock.h>
#include <linux/hardirq.h>
+#include "ctree.h"
#include "extent_map.h"
return em;
em->in_tree = 0;
em->flags = 0;
+ em->compress_type = BTRFS_COMPRESS_NONE;
atomic_set(&em->refs, 1);
return em;
}
unsigned long flags;
struct block_device *bdev;
atomic_t refs;
- int in_tree;
+ unsigned int in_tree:1;
+ unsigned int compress_type:4;
};
struct extent_map_tree {
split->bdev = em->bdev;
split->flags = flags;
+ split->compress_type = em->compress_type;
ret = add_extent_mapping(em_tree, split);
BUG_ON(ret);
free_extent_map(split);
split->len = em->start + em->len - (start + len);
split->bdev = em->bdev;
split->flags = flags;
+ split->compress_type = em->compress_type;
if (compressed) {
split->block_len = em->block_len;
size_t cur_size = size;
size_t datasize;
unsigned long offset;
- int use_compress = 0;
+ int compress_type = BTRFS_COMPRESS_NONE;
if (compressed_size && compressed_pages) {
- use_compress = 1;
+ compress_type = root->fs_info->compress_type;
cur_size = compressed_size;
}
btrfs_set_file_extent_ram_bytes(leaf, ei, size);
ptr = btrfs_file_extent_inline_start(ei);
- if (use_compress) {
+ if (compress_type != BTRFS_COMPRESS_NONE) {
struct page *cpage;
int i = 0;
while (compressed_size > 0) {
compressed_size -= cur_size;
}
btrfs_set_file_extent_compression(leaf, ei,
- BTRFS_COMPRESS_ZLIB);
+ compress_type);
} else {
page = find_get_page(inode->i_mapping,
start >> PAGE_CACHE_SHIFT);
u64 compressed_size;
struct page **pages;
unsigned long nr_pages;
+ int compress_type;
struct list_head list;
};
u64 start, u64 ram_size,
u64 compressed_size,
struct page **pages,
- unsigned long nr_pages)
+ unsigned long nr_pages,
+ int compress_type)
{
struct async_extent *async_extent;
async_extent->compressed_size = compressed_size;
async_extent->pages = pages;
async_extent->nr_pages = nr_pages;
+ async_extent->compress_type = compress_type;
list_add_tail(&async_extent->list, &cow->extents);
return 0;
}
unsigned long max_uncompressed = 128 * 1024;
int i;
int will_compress;
+ int compress_type = root->fs_info->compress_type;
actual_end = min_t(u64, isize, end + 1);
again:
WARN_ON(pages);
pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
- ret = btrfs_zlib_compress_pages(inode->i_mapping, start,
- total_compressed, pages,
- nr_pages, &nr_pages_ret,
- &total_in,
- &total_compressed,
- max_compressed);
+ if (BTRFS_I(inode)->force_compress)
+ compress_type = BTRFS_I(inode)->force_compress;
+
+ ret = btrfs_compress_pages(compress_type,
+ inode->i_mapping, start,
+ total_compressed, pages,
+ nr_pages, &nr_pages_ret,
+ &total_in,
+ &total_compressed,
+ max_compressed);
if (!ret) {
unsigned long offset = total_compressed &
* and will submit them to the elevator.
*/
add_async_extent(async_cow, start, num_bytes,
- total_compressed, pages, nr_pages_ret);
+ total_compressed, pages, nr_pages_ret,
+ compress_type);
if (start + num_bytes < end) {
start += num_bytes;
__set_page_dirty_nobuffers(locked_page);
/* unlocked later on in the async handlers */
}
- add_async_extent(async_cow, start, end - start + 1, 0, NULL, 0);
+ add_async_extent(async_cow, start, end - start + 1,
+ 0, NULL, 0, BTRFS_COMPRESS_NONE);
*num_added += 1;
}
em->block_start = ins.objectid;
em->block_len = ins.offset;
em->bdev = root->fs_info->fs_devices->latest_bdev;
+ em->compress_type = async_extent->compress_type;
set_bit(EXTENT_FLAG_PINNED, &em->flags);
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
async_extent->ram_size - 1, 0);
}
- ret = btrfs_add_ordered_extent(inode, async_extent->start,
- ins.objectid,
- async_extent->ram_size,
- ins.offset,
- BTRFS_ORDERED_COMPRESSED);
+ ret = btrfs_add_ordered_extent_compress(inode,
+ async_extent->start,
+ ins.objectid,
+ async_extent->ram_size,
+ ins.offset,
+ BTRFS_ORDERED_COMPRESSED,
+ async_extent->compress_type);
BUG_ON(ret);
/*
struct btrfs_ordered_extent *ordered_extent = NULL;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct extent_state *cached_state = NULL;
- int compressed = 0;
+ int compress_type = 0;
int ret;
bool nolock = false;
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags))
- compressed = 1;
+ compress_type = ordered_extent->compress_type;
if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) {
- BUG_ON(compressed);
+ BUG_ON(compress_type);
ret = btrfs_mark_extent_written(trans, inode,
ordered_extent->file_offset,
ordered_extent->file_offset +
ordered_extent->disk_len,
ordered_extent->len,
ordered_extent->len,
- compressed, 0, 0,
+ compress_type, 0, 0,
BTRFS_FILE_EXTENT_REG);
unpin_extent_cache(&BTRFS_I(inode)->extent_tree,
ordered_extent->file_offset,
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
logical = em->block_start;
failrec->bio_flags = EXTENT_BIO_COMPRESSED;
+ extent_set_compress_type(&failrec->bio_flags,
+ em->compress_type);
}
failrec->logical = logical;
free_extent_map(em);
size_t max_size;
unsigned long inline_size;
unsigned long ptr;
+ int compress_type;
WARN_ON(pg_offset != 0);
+ compress_type = btrfs_file_extent_compression(leaf, item);
max_size = btrfs_file_extent_ram_bytes(leaf, item);
inline_size = btrfs_file_extent_inline_item_len(leaf,
btrfs_item_nr(leaf, path->slots[0]));
read_extent_buffer(leaf, tmp, ptr, inline_size);
max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size);
- ret = btrfs_zlib_decompress(tmp, page, extent_offset,
- inline_size, max_size);
+ ret = btrfs_decompress(compress_type, tmp, page,
+ extent_offset, inline_size, max_size);
if (ret) {
char *kaddr = kmap_atomic(page, KM_USER0);
unsigned long copy_size = min_t(u64,
struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
struct btrfs_trans_handle *trans = NULL;
- int compressed;
+ int compress_type;
again:
read_lock(&em_tree->lock);
found_type = btrfs_file_extent_type(leaf, item);
extent_start = found_key.offset;
- compressed = btrfs_file_extent_compression(leaf, item);
+ compress_type = btrfs_file_extent_compression(leaf, item);
if (found_type == BTRFS_FILE_EXTENT_REG ||
found_type == BTRFS_FILE_EXTENT_PREALLOC) {
extent_end = extent_start +
em->block_start = EXTENT_MAP_HOLE;
goto insert;
}
- if (compressed) {
+ if (compress_type != BTRFS_COMPRESS_NONE) {
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
+ em->compress_type = compress_type;
em->block_start = bytenr;
em->block_len = btrfs_file_extent_disk_num_bytes(leaf,
item);
em->len = (copy_size + root->sectorsize - 1) &
~((u64)root->sectorsize - 1);
em->orig_start = EXTENT_MAP_INLINE;
- if (compressed)
+ if (compress_type) {
set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
+ em->compress_type = compress_type;
+ }
ptr = btrfs_file_extent_inline_start(item) + extent_offset;
if (create == 0 && !PageUptodate(page)) {
- if (btrfs_file_extent_compression(leaf, item) ==
- BTRFS_COMPRESS_ZLIB) {
+ if (btrfs_file_extent_compression(leaf, item) !=
+ BTRFS_COMPRESS_NONE) {
ret = uncompress_inline(path, inode, page,
pg_offset,
extent_offset, item);
ei->ordered_data_close = 0;
ei->orphan_meta_reserved = 0;
ei->dummy_inode = 0;
- ei->force_compress = 0;
+ ei->force_compress = BTRFS_COMPRESS_NONE;
inode = &ei->vfs_inode;
extent_map_tree_init(&ei->extent_tree, GFP_NOFS);
total_read++;
mutex_lock(&inode->i_mutex);
if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS)
- BTRFS_I(inode)->force_compress = 1;
+ BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_ZLIB;
ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE);
if (ret)
atomic_dec(&root->fs_info->async_submit_draining);
mutex_lock(&inode->i_mutex);
- BTRFS_I(inode)->force_compress = 0;
+ BTRFS_I(inode)->force_compress = BTRFS_COMPRESS_NONE;
mutex_unlock(&inode->i_mutex);
}
*/
static int __btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len,
- int type, int dio)
+ int type, int dio, int compress_type)
{
struct btrfs_ordered_inode_tree *tree;
struct rb_node *node;
entry->disk_len = disk_len;
entry->bytes_left = len;
entry->inode = inode;
+ entry->compress_type = compress_type;
if (type != BTRFS_ORDERED_IO_DONE && type != BTRFS_ORDERED_COMPLETE)
set_bit(type, &entry->flags);
u64 start, u64 len, u64 disk_len, int type)
{
return __btrfs_add_ordered_extent(inode, file_offset, start, len,
- disk_len, type, 0);
+ disk_len, type, 0,
+ BTRFS_COMPRESS_NONE);
}
int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len, int type)
{
return __btrfs_add_ordered_extent(inode, file_offset, start, len,
- disk_len, type, 1);
+ disk_len, type, 1,
+ BTRFS_COMPRESS_NONE);
+}
+
+int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
+ u64 start, u64 len, u64 disk_len,
+ int type, int compress_type)
+{
+ return __btrfs_add_ordered_extent(inode, file_offset, start, len,
+ disk_len, type, 0,
+ compress_type);
}
/*
#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
-#define BTRFS_ORDERED_COMPRESSED 3 /* writing a compressed extent */
+#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
/* flags (described above) */
unsigned long flags;
+ /* compression algorithm */
+ int compress_type;
+
/* reference count */
atomic_t refs;
u64 start, u64 len, u64 disk_len, int type);
int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
u64 start, u64 len, u64 disk_len, int type);
+int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
+ u64 start, u64 len, u64 disk_len,
+ int type, int compress_type);
int btrfs_add_ordered_sum(struct inode *inode,
struct btrfs_ordered_extent *entry,
struct btrfs_ordered_sum *sum);
Opt_degraded, Opt_subvol, Opt_subvolid, Opt_device, Opt_nodatasum,
Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
- Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
- Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_err,
- Opt_user_subvol_rm_allowed,
+ Opt_compress_type, Opt_compress_force, Opt_compress_force_type,
+ Opt_notreelog, Opt_ratio, Opt_flushoncommit, Opt_discard,
+ Opt_space_cache, Opt_clear_cache, Opt_user_subvol_rm_allowed, Opt_err,
};
static match_table_t tokens = {
{Opt_alloc_start, "alloc_start=%s"},
{Opt_thread_pool, "thread_pool=%d"},
{Opt_compress, "compress"},
+ {Opt_compress_type, "compress=%s"},
{Opt_compress_force, "compress-force"},
+ {Opt_compress_force_type, "compress-force=%s"},
{Opt_ssd, "ssd"},
{Opt_ssd_spread, "ssd_spread"},
{Opt_nossd, "nossd"},
char *p, *num, *orig;
int intarg;
int ret = 0;
+ char *compress_type;
+ bool compress_force = false;
if (!options)
return 0;
btrfs_set_opt(info->mount_opt, NODATACOW);
btrfs_set_opt(info->mount_opt, NODATASUM);
break;
- case Opt_compress:
- printk(KERN_INFO "btrfs: use compression\n");
- btrfs_set_opt(info->mount_opt, COMPRESS);
- break;
case Opt_compress_force:
- printk(KERN_INFO "btrfs: forcing compression\n");
- btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
+ case Opt_compress_force_type:
+ compress_force = true;
+ case Opt_compress:
+ case Opt_compress_type:
+ if (token == Opt_compress ||
+ token == Opt_compress_force ||
+ strcmp(args[0].from, "zlib") == 0) {
+ compress_type = "zlib";
+ info->compress_type = BTRFS_COMPRESS_ZLIB;
+ } else {
+ ret = -EINVAL;
+ goto out;
+ }
+
btrfs_set_opt(info->mount_opt, COMPRESS);
+ if (compress_force) {
+ btrfs_set_opt(info->mount_opt, FORCE_COMPRESS);
+ pr_info("btrfs: force %s compression\n",
+ compress_type);
+ } else
+ pr_info("btrfs: use %s compression\n",
+ compress_type);
break;
case Opt_ssd:
printk(KERN_INFO "btrfs: use ssd allocation scheme\n");
if (err)
return err;
- err = btrfs_init_cachep();
+ err = btrfs_init_compress();
if (err)
goto free_sysfs;
+ err = btrfs_init_cachep();
+ if (err)
+ goto free_compress;
+
err = extent_io_init();
if (err)
goto free_cachep;
extent_io_exit();
free_cachep:
btrfs_destroy_cachep();
+free_compress:
+ btrfs_exit_compress();
free_sysfs:
btrfs_exit_sysfs();
return err;
unregister_filesystem(&btrfs_fs_type);
btrfs_exit_sysfs();
btrfs_cleanup_fs_uuids();
- btrfs_zlib_exit();
+ btrfs_exit_compress();
}
module_init(init_btrfs_fs)
#include <linux/bio.h>
#include "compression.h"
-/* Plan: call deflate() with avail_in == *sourcelen,
- avail_out = *dstlen - 12 and flush == Z_FINISH.
- If it doesn't manage to finish, call it again with
- avail_in == 0 and avail_out set to the remaining 12
- bytes for it to clean up.
- Q: Is 12 bytes sufficient?
-*/
-#define STREAM_END_SPACE 12
-
struct workspace {
z_stream inf_strm;
z_stream def_strm;
struct list_head list;
};
-static LIST_HEAD(idle_workspace);
-static DEFINE_SPINLOCK(workspace_lock);
-static unsigned long num_workspace;
-static atomic_t alloc_workspace = ATOMIC_INIT(0);
-static DECLARE_WAIT_QUEUE_HEAD(workspace_wait);
+static void zlib_free_workspace(struct list_head *ws)
+{
+ struct workspace *workspace = list_entry(ws, struct workspace, list);
-/*
- * this finds an available zlib workspace or allocates a new one
- * NULL or an ERR_PTR is returned if things go bad.
- */
-static struct workspace *find_zlib_workspace(void)
+ vfree(workspace->def_strm.workspace);
+ vfree(workspace->inf_strm.workspace);
+ kfree(workspace->buf);
+ kfree(workspace);
+}
+
+static struct list_head *zlib_alloc_workspace(void)
{
struct workspace *workspace;
- int ret;
- int cpus = num_online_cpus();
-
-again:
- spin_lock(&workspace_lock);
- if (!list_empty(&idle_workspace)) {
- workspace = list_entry(idle_workspace.next, struct workspace,
- list);
- list_del(&workspace->list);
- num_workspace--;
- spin_unlock(&workspace_lock);
- return workspace;
-
- }
- if (atomic_read(&alloc_workspace) > cpus) {
- DEFINE_WAIT(wait);
-
- spin_unlock(&workspace_lock);
- prepare_to_wait(&workspace_wait, &wait, TASK_UNINTERRUPTIBLE);
- if (atomic_read(&alloc_workspace) > cpus && !num_workspace)
- schedule();
- finish_wait(&workspace_wait, &wait);
- goto again;
- }
- atomic_inc(&alloc_workspace);
- spin_unlock(&workspace_lock);
workspace = kzalloc(sizeof(*workspace), GFP_NOFS);
- if (!workspace) {
- ret = -ENOMEM;
- goto fail;
- }
+ if (!workspace)
+ return ERR_PTR(-ENOMEM);
workspace->def_strm.workspace = vmalloc(zlib_deflate_workspacesize());
- if (!workspace->def_strm.workspace) {
- ret = -ENOMEM;
- goto fail;
- }
workspace->inf_strm.workspace = vmalloc(zlib_inflate_workspacesize());
- if (!workspace->inf_strm.workspace) {
- ret = -ENOMEM;
- goto fail_inflate;
- }
workspace->buf = kmalloc(PAGE_CACHE_SIZE, GFP_NOFS);
- if (!workspace->buf) {
- ret = -ENOMEM;
- goto fail_kmalloc;
- }
- return workspace;
-
-fail_kmalloc:
- vfree(workspace->inf_strm.workspace);
-fail_inflate:
- vfree(workspace->def_strm.workspace);
-fail:
- kfree(workspace);
- atomic_dec(&alloc_workspace);
- wake_up(&workspace_wait);
- return ERR_PTR(ret);
-}
-
-/*
- * put a workspace struct back on the list or free it if we have enough
- * idle ones sitting around
- */
-static int free_workspace(struct workspace *workspace)
-{
- spin_lock(&workspace_lock);
- if (num_workspace < num_online_cpus()) {
- list_add_tail(&workspace->list, &idle_workspace);
- num_workspace++;
- spin_unlock(&workspace_lock);
- if (waitqueue_active(&workspace_wait))
- wake_up(&workspace_wait);
- return 0;
- }
- spin_unlock(&workspace_lock);
- vfree(workspace->def_strm.workspace);
- vfree(workspace->inf_strm.workspace);
- kfree(workspace->buf);
- kfree(workspace);
+ if (!workspace->def_strm.workspace ||
+ !workspace->inf_strm.workspace || !workspace->buf)
+ goto fail;
- atomic_dec(&alloc_workspace);
- if (waitqueue_active(&workspace_wait))
- wake_up(&workspace_wait);
- return 0;
-}
+ INIT_LIST_HEAD(&workspace->list);
-/*
- * cleanup function for module exit
- */
-static void free_workspaces(void)
-{
- struct workspace *workspace;
- while (!list_empty(&idle_workspace)) {
- workspace = list_entry(idle_workspace.next, struct workspace,
- list);
- list_del(&workspace->list);
- vfree(workspace->def_strm.workspace);
- vfree(workspace->inf_strm.workspace);
- kfree(workspace->buf);
- kfree(workspace);
- atomic_dec(&alloc_workspace);
- }
+ return &workspace->list;
+fail:
+ zlib_free_workspace(&workspace->list);
+ return ERR_PTR(-ENOMEM);
}
-/*
- * given an address space and start/len, compress the bytes.
- *
- * pages are allocated to hold the compressed result and stored
- * in 'pages'
- *
- * out_pages is used to return the number of pages allocated. There
- * may be pages allocated even if we return an error
- *
- * total_in is used to return the number of bytes actually read. It
- * may be smaller then len if we had to exit early because we
- * ran out of room in the pages array or because we cross the
- * max_out threshold.
- *
- * total_out is used to return the total number of compressed bytes
- *
- * max_out tells us the max number of bytes that we're allowed to
- * stuff into pages
- */
-int btrfs_zlib_compress_pages(struct address_space *mapping,
- u64 start, unsigned long len,
- struct page **pages,
- unsigned long nr_dest_pages,
- unsigned long *out_pages,
- unsigned long *total_in,
- unsigned long *total_out,
- unsigned long max_out)
+static int zlib_compress_pages(struct list_head *ws,
+ struct address_space *mapping,
+ u64 start, unsigned long len,
+ struct page **pages,
+ unsigned long nr_dest_pages,
+ unsigned long *out_pages,
+ unsigned long *total_in,
+ unsigned long *total_out,
+ unsigned long max_out)
{
+ struct workspace *workspace = list_entry(ws, struct workspace, list);
int ret;
- struct workspace *workspace;
char *data_in;
char *cpage_out;
int nr_pages = 0;
*total_out = 0;
*total_in = 0;
- workspace = find_zlib_workspace();
- if (IS_ERR(workspace))
- return -1;
-
if (Z_OK != zlib_deflateInit(&workspace->def_strm, 3)) {
printk(KERN_WARNING "deflateInit failed\n");
ret = -1;
kunmap(in_page);
page_cache_release(in_page);
}
- free_workspace(workspace);
return ret;
}
-/*
- * pages_in is an array of pages with compressed data.
- *
- * disk_start is the starting logical offset of this array in the file
- *
- * bvec is a bio_vec of pages from the file that we want to decompress into
- *
- * vcnt is the count of pages in the biovec
- *
- * srclen is the number of bytes in pages_in
- *
- * The basic idea is that we have a bio that was created by readpages.
- * The pages in the bio are for the uncompressed data, and they may not
- * be contiguous. They all correspond to the range of bytes covered by
- * the compressed extent.
- */
-int btrfs_zlib_decompress_biovec(struct page **pages_in,
- u64 disk_start,
- struct bio_vec *bvec,
- int vcnt,
- size_t srclen)
+static int zlib_decompress_biovec(struct list_head *ws, struct page **pages_in,
+ u64 disk_start,
+ struct bio_vec *bvec,
+ int vcnt,
+ size_t srclen)
{
+ struct workspace *workspace = list_entry(ws, struct workspace, list);
int ret = 0;
int wbits = MAX_WBITS;
- struct workspace *workspace;
char *data_in;
size_t total_out = 0;
unsigned long page_bytes_left;
unsigned long current_buf_start;
char *kaddr;
- workspace = find_zlib_workspace();
- if (IS_ERR(workspace))
- return -ENOMEM;
-
data_in = kmap(pages_in[page_in_index]);
workspace->inf_strm.next_in = data_in;
workspace->inf_strm.avail_in = min_t(size_t, srclen, PAGE_CACHE_SIZE);
if (Z_OK != zlib_inflateInit2(&workspace->inf_strm, wbits)) {
printk(KERN_WARNING "inflateInit failed\n");
- ret = -1;
- goto out;
+ return -1;
}
while (workspace->inf_strm.total_in < srclen) {
ret = zlib_inflate(&workspace->inf_strm, Z_NO_FLUSH);
zlib_inflateEnd(&workspace->inf_strm);
if (data_in)
kunmap(pages_in[page_in_index]);
-out:
- free_workspace(workspace);
return ret;
}
-/*
- * a less complex decompression routine. Our compressed data fits in a
- * single page, and we want to read a single page out of it.
- * start_byte tells us the offset into the compressed data we're interested in
- */
-int btrfs_zlib_decompress(unsigned char *data_in,
- struct page *dest_page,
- unsigned long start_byte,
- size_t srclen, size_t destlen)
+static int zlib_decompress(struct list_head *ws, unsigned char *data_in,
+ struct page *dest_page,
+ unsigned long start_byte,
+ size_t srclen, size_t destlen)
{
+ struct workspace *workspace = list_entry(ws, struct workspace, list);
int ret = 0;
int wbits = MAX_WBITS;
- struct workspace *workspace;
unsigned long bytes_left = destlen;
unsigned long total_out = 0;
char *kaddr;
- if (destlen > PAGE_CACHE_SIZE)
- return -ENOMEM;
-
- workspace = find_zlib_workspace();
- if (IS_ERR(workspace))
- return -ENOMEM;
-
workspace->inf_strm.next_in = data_in;
workspace->inf_strm.avail_in = srclen;
workspace->inf_strm.total_in = 0;
if (Z_OK != zlib_inflateInit2(&workspace->inf_strm, wbits)) {
printk(KERN_WARNING "inflateInit failed\n");
- ret = -1;
- goto out;
+ return -1;
}
while (bytes_left > 0) {
ret = 0;
zlib_inflateEnd(&workspace->inf_strm);
-out:
- free_workspace(workspace);
return ret;
}
-void btrfs_zlib_exit(void)
-{
- free_workspaces();
-}
+struct btrfs_compress_op btrfs_zlib_compress = {
+ .alloc_workspace = zlib_alloc_workspace,
+ .free_workspace = zlib_free_workspace,
+ .compress_pages = zlib_compress_pages,
+ .decompress_biovec = zlib_decompress_biovec,
+ .decompress = zlib_decompress,
+};
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