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btrfs: compression: inline free_workspace 

Replace indirect calls to free_workspace by switch and calls to the
specific callbacks. This is mainly to get rid of the indirection due to
spectre vulnerability mitigations.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2019-10-04 02:57:22 +02:00
parent a3bbd2a9ee
commit 1e00235160
5 changed files with 18 additions and 8 deletions
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21
fs/btrfs/compression.c
View File

@ -912,7 +912,6 @@ static struct list_head *alloc_heuristic_ws(unsigned int level)
const struct btrfs_compress_op btrfs_heuristic_compress = {
.workspace_manager = &heuristic_wsm,
.free_workspace = free_heuristic_ws,
};
static const struct btrfs_compress_op * const btrfs_compress_op[] = {
@ -939,6 +938,22 @@ static struct list_head *alloc_workspace(int type, unsigned int level)
}
}
static void free_workspace(int type, struct list_head *ws)
{
switch (type) {
case BTRFS_COMPRESS_NONE: return free_heuristic_ws(ws);
case BTRFS_COMPRESS_ZLIB: return zlib_free_workspace(ws);
case BTRFS_COMPRESS_LZO: return lzo_free_workspace(ws);
case BTRFS_COMPRESS_ZSTD: return zstd_free_workspace(ws);
default:
/*
* This can't happen, the type is validated several times
* before we get here.
*/
BUG();
}
}
static void btrfs_init_workspace_manager(int type)
{
const struct btrfs_compress_op *ops = btrfs_compress_op[type];
@ -976,7 +991,7 @@ static void btrfs_cleanup_workspace_manager(int type)
while (!list_empty(&wsman->idle_ws)) {
ws = wsman->idle_ws.next;
list_del(ws);
wsman->ops->free_workspace(ws);
free_workspace(type, ws);
atomic_dec(&wsman->total_ws);
}
}
@ -1111,7 +1126,7 @@ void btrfs_put_workspace(int type, struct list_head *ws)
}
spin_unlock(ws_lock);
wsm->ops->free_workspace(ws);
free_workspace(type, ws);
atomic_dec(total_ws);
wake:
cond_wake_up(ws_wait);

2
fs/btrfs/compression.h
View File

@ -124,8 +124,6 @@ struct list_head *btrfs_get_workspace(int type, unsigned int level);
void btrfs_put_workspace(int type, struct list_head *ws);
struct btrfs_compress_op {
void (*free_workspace)(struct list_head *workspace);
struct workspace_manager *workspace_manager;
/* Maximum level supported by the compression algorithm */
unsigned int max_level;

1
fs/btrfs/lzo.c
View File

@ -484,7 +484,6 @@ int lzo_decompress(struct list_head *ws, unsigned char *data_in,
const struct btrfs_compress_op btrfs_lzo_compress = {
.workspace_manager = &wsm,
.free_workspace = lzo_free_workspace,
.max_level = 1,
.default_level = 1,
};

1
fs/btrfs/zlib.c
View File

@ -400,7 +400,6 @@ int zlib_decompress(struct list_head *ws, unsigned char *data_in,
const struct btrfs_compress_op btrfs_zlib_compress = {
.workspace_manager = &wsm,
.free_workspace = zlib_free_workspace,
.max_level = 9,
.default_level = BTRFS_ZLIB_DEFAULT_LEVEL,
};

1
fs/btrfs/zstd.c
View File

@ -708,7 +708,6 @@ int zstd_decompress(struct list_head *ws, unsigned char *data_in,
const struct btrfs_compress_op btrfs_zstd_compress = {
/* ZSTD uses own workspace manager */
.workspace_manager = NULL,
.free_workspace = zstd_free_workspace,
.max_level = ZSTD_BTRFS_MAX_LEVEL,
.default_level = ZSTD_BTRFS_DEFAULT_LEVEL,
};