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btrfs: move to function pointers for get/put workspaces

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The previous patch added generic helpers for get_workspace() and
put_workspace(). Now, we can migrate ownership of the workspace_manager
to be in the compression type code as the compression code itself
doesn't care beyond being able to get a workspace. The init/cleanup and
get/put methods are abstracted so each compression algorithm can decide
how they want to manage their workspaces.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Dennis Zhou
2019-02-04 15:20:03 -05:00
committed by David Sterba
parent 929f4baf93
commit 92ee553036
5 changed files with 160 additions and 45 deletions
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26
fs/btrfs/compression.h
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@@ -107,7 +107,33 @@ enum btrfs_compression_type {
BTRFS_COMPRESS_TYPES = 3,
};
struct workspace_manager {
const struct btrfs_compress_op *ops;
struct list_head idle_ws;
spinlock_t ws_lock;
/* Number of free workspaces */
int free_ws;
/* Total number of allocated workspaces */
atomic_t total_ws;
/* Waiters for a free workspace */
wait_queue_head_t ws_wait;
};
void btrfs_init_workspace_manager(struct workspace_manager *wsm,
const struct btrfs_compress_op *ops);
struct list_head *btrfs_get_workspace(struct workspace_manager *wsm);
void btrfs_put_workspace(struct workspace_manager *wsm, struct list_head *ws);
void btrfs_cleanup_workspace_manager(struct workspace_manager *wsm);
struct btrfs_compress_op {
void (*init_workspace_manager)(void);
void (*cleanup_workspace_manager)(void);
struct list_head *(*get_workspace)(void);
void (*put_workspace)(struct list_head *ws);
struct list_head *(*alloc_workspace)(void);
void (*free_workspace)(struct list_head *workspace);