return ERR_PTR(-ENOMEM);
}
-struct workspaces_list {
+const struct btrfs_compress_op btrfs_heuristic_compress = {
+ .alloc_workspace = alloc_heuristic_ws,
+ .free_workspace = free_heuristic_ws,
+};
+
+struct workspace_manager {
+ const struct btrfs_compress_op *ops;
struct list_head idle_ws;
spinlock_t ws_lock;
/* Number of free workspaces */
wait_queue_head_t ws_wait;
};
-static struct workspaces_list btrfs_comp_ws[BTRFS_COMPRESS_TYPES];
-
-static struct workspaces_list btrfs_heuristic_ws;
+static struct workspace_manager wsm[BTRFS_NR_WORKSPACE_MANAGERS];
static const struct btrfs_compress_op * const btrfs_compress_op[] = {
+ /* The heuristic is represented as compression type 0 */
+ &btrfs_heuristic_compress,
&btrfs_zlib_compress,
&btrfs_lzo_compress,
&btrfs_zstd_compress,
struct list_head *workspace;
int i;
- INIT_LIST_HEAD(&btrfs_heuristic_ws.idle_ws);
- spin_lock_init(&btrfs_heuristic_ws.ws_lock);
- atomic_set(&btrfs_heuristic_ws.total_ws, 0);
- init_waitqueue_head(&btrfs_heuristic_ws.ws_wait);
+ for (i = 0; i < BTRFS_NR_WORKSPACE_MANAGERS; i++) {
+ wsm[i].ops = btrfs_compress_op[i];
- workspace = alloc_heuristic_ws();
- if (IS_ERR(workspace)) {
- pr_warn(
- "BTRFS: cannot preallocate heuristic workspace, will try later\n");
- } else {
- atomic_set(&btrfs_heuristic_ws.total_ws, 1);
- btrfs_heuristic_ws.free_ws = 1;
- list_add(workspace, &btrfs_heuristic_ws.idle_ws);
- }
-
- for (i = 0; i < BTRFS_COMPRESS_TYPES; i++) {
- INIT_LIST_HEAD(&btrfs_comp_ws[i].idle_ws);
- spin_lock_init(&btrfs_comp_ws[i].ws_lock);
- atomic_set(&btrfs_comp_ws[i].total_ws, 0);
- init_waitqueue_head(&btrfs_comp_ws[i].ws_wait);
+ INIT_LIST_HEAD(&wsm[i].idle_ws);
+ spin_lock_init(&wsm[i].ws_lock);
+ atomic_set(&wsm[i].total_ws, 0);
+ init_waitqueue_head(&wsm[i].ws_wait);
/*
* Preallocate one workspace for each compression type so
* we can guarantee forward progress in the worst case
*/
- workspace = btrfs_compress_op[i]->alloc_workspace();
+ workspace = wsm[i].ops->alloc_workspace();
if (IS_ERR(workspace)) {
pr_warn("BTRFS: cannot preallocate compression workspace, will try later\n");
} else {
- atomic_set(&btrfs_comp_ws[i].total_ws, 1);
- btrfs_comp_ws[i].free_ws = 1;
- list_add(workspace, &btrfs_comp_ws[i].idle_ws);
+ atomic_set(&wsm[i].total_ws, 1);
+ wsm[i].free_ws = 1;
+ list_add(workspace, &wsm[i].idle_ws);
}
}
}
* Preallocation makes a forward progress guarantees and we do not return
* errors.
*/
-static struct list_head *__find_workspace(int type, bool heuristic)
+static struct list_head *find_workspace(int type)
{
struct list_head *workspace;
int cpus = num_online_cpus();
- int idx = type - 1;
unsigned nofs_flag;
struct list_head *idle_ws;
spinlock_t *ws_lock;
wait_queue_head_t *ws_wait;
int *free_ws;
- if (heuristic) {
- idle_ws = &btrfs_heuristic_ws.idle_ws;
- ws_lock = &btrfs_heuristic_ws.ws_lock;
- total_ws = &btrfs_heuristic_ws.total_ws;
- ws_wait = &btrfs_heuristic_ws.ws_wait;
- free_ws = &btrfs_heuristic_ws.free_ws;
- } else {
- idle_ws = &btrfs_comp_ws[idx].idle_ws;
- ws_lock = &btrfs_comp_ws[idx].ws_lock;
- total_ws = &btrfs_comp_ws[idx].total_ws;
- ws_wait = &btrfs_comp_ws[idx].ws_wait;
- free_ws = &btrfs_comp_ws[idx].free_ws;
- }
+ idle_ws = &wsm[type].idle_ws;
+ ws_lock = &wsm[type].ws_lock;
+ total_ws = &wsm[type].total_ws;
+ ws_wait = &wsm[type].ws_wait;
+ free_ws = &wsm[type].free_ws;
again:
spin_lock(ws_lock);
* context of btrfs_compress_bio/btrfs_compress_pages
*/
nofs_flag = memalloc_nofs_save();
- if (heuristic)
- workspace = alloc_heuristic_ws();
- else
- workspace = btrfs_compress_op[idx]->alloc_workspace();
+ workspace = wsm[type].ops->alloc_workspace();
memalloc_nofs_restore(nofs_flag);
if (IS_ERR(workspace)) {
return workspace;
}
-static struct list_head *find_workspace(int type)
-{
- return __find_workspace(type, false);
-}
-
/*
* 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,
- bool heuristic)
+static void free_workspace(int type, struct list_head *workspace)
{
- int idx = type - 1;
struct list_head *idle_ws;
spinlock_t *ws_lock;
atomic_t *total_ws;
wait_queue_head_t *ws_wait;
int *free_ws;
- if (heuristic) {
- idle_ws = &btrfs_heuristic_ws.idle_ws;
- ws_lock = &btrfs_heuristic_ws.ws_lock;
- total_ws = &btrfs_heuristic_ws.total_ws;
- ws_wait = &btrfs_heuristic_ws.ws_wait;
- free_ws = &btrfs_heuristic_ws.free_ws;
- } else {
- idle_ws = &btrfs_comp_ws[idx].idle_ws;
- ws_lock = &btrfs_comp_ws[idx].ws_lock;
- total_ws = &btrfs_comp_ws[idx].total_ws;
- ws_wait = &btrfs_comp_ws[idx].ws_wait;
- free_ws = &btrfs_comp_ws[idx].free_ws;
- }
+ idle_ws = &wsm[type].idle_ws;
+ ws_lock = &wsm[type].ws_lock;
+ total_ws = &wsm[type].total_ws;
+ ws_wait = &wsm[type].ws_wait;
+ free_ws = &wsm[type].free_ws;
spin_lock(ws_lock);
if (*free_ws <= num_online_cpus()) {
}
spin_unlock(ws_lock);
- if (heuristic)
- free_heuristic_ws(workspace);
- else
- btrfs_compress_op[idx]->free_workspace(workspace);
+ wsm[type].ops->free_workspace(workspace);
atomic_dec(total_ws);
wake:
cond_wake_up(ws_wait);
}
-static void free_workspace(int type, struct list_head *ws)
-{
- return __free_workspace(type, ws, false);
-}
-
/*
* cleanup function for module exit
*/
struct list_head *workspace;
int i;
- while (!list_empty(&btrfs_heuristic_ws.idle_ws)) {
- workspace = btrfs_heuristic_ws.idle_ws.next;
- list_del(workspace);
- free_heuristic_ws(workspace);
- atomic_dec(&btrfs_heuristic_ws.total_ws);
- }
-
- for (i = 0; i < BTRFS_COMPRESS_TYPES; i++) {
- while (!list_empty(&btrfs_comp_ws[i].idle_ws)) {
- workspace = btrfs_comp_ws[i].idle_ws.next;
+ for (i = 0; i < BTRFS_NR_WORKSPACE_MANAGERS; i++) {
+ while (!list_empty(&wsm[i].idle_ws)) {
+ workspace = wsm[i].idle_ws.next;
list_del(workspace);
- btrfs_compress_op[i]->free_workspace(workspace);
- atomic_dec(&btrfs_comp_ws[i].total_ws);
+ wsm[i].ops->free_workspace(workspace);
+ atomic_dec(&wsm[i].total_ws);
}
}
}
unsigned long *total_in,
unsigned long *total_out)
{
+ int type = btrfs_compress_type(type_level);
struct list_head *workspace;
int ret;
- int type = type_level & 0xF;
workspace = find_workspace(type);
- btrfs_compress_op[type - 1]->set_level(workspace, type_level);
- ret = btrfs_compress_op[type-1]->compress_pages(workspace, mapping,
+ btrfs_compress_op[type]->set_level(workspace, type_level);
+ ret = btrfs_compress_op[type]->compress_pages(workspace, mapping,
start, pages,
out_pages,
total_in, total_out);
int type = cb->compress_type;
workspace = find_workspace(type);
- ret = btrfs_compress_op[type - 1]->decompress_bio(workspace, cb);
+ ret = btrfs_compress_op[type]->decompress_bio(workspace, cb);
free_workspace(type, workspace);
return ret;
workspace = find_workspace(type);
- ret = btrfs_compress_op[type-1]->decompress(workspace, data_in,
+ ret = btrfs_compress_op[type]->decompress(workspace, data_in,
dest_page, start_byte,
srclen, destlen);
*/
int btrfs_compress_heuristic(struct inode *inode, u64 start, u64 end)
{
- struct list_head *ws_list = __find_workspace(0, true);
+ struct list_head *ws_list = find_workspace(0);
struct heuristic_ws *ws;
u32 i;
u8 byte;
}
out:
- __free_workspace(0, ws_list, true);
+ free_workspace(0, ws_list);
return ret;
}
git.samba.org / sfrench / cifs-2.6.git / blobdiff