diff options
Diffstat (limited to 'include/linux/dm-bufio.h')
| -rw-r--r-- | include/linux/dm-bufio.h | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/include/linux/dm-bufio.h b/include/linux/dm-bufio.h index 3c8b7d274bd9..15d9e15ca830 100644 --- a/include/linux/dm-bufio.h +++ b/include/linux/dm-bufio.h @@ -18,13 +18,19 @@ struct dm_bufio_client; struct dm_buffer; /* + * Flags for dm_bufio_client_create + */ +#define DM_BUFIO_CLIENT_NO_SLEEP 0x1 + +/* * Create a buffered IO cache on a given device */ struct dm_bufio_client * dm_bufio_client_create(struct block_device *bdev, unsigned block_size, unsigned reserved_buffers, unsigned aux_size, void (*alloc_callback)(struct dm_buffer *), - void (*write_callback)(struct dm_buffer *)); + void (*write_callback)(struct dm_buffer *), + unsigned int flags); /* * Release a buffered IO cache. @@ -119,6 +125,11 @@ int dm_bufio_write_dirty_buffers(struct dm_bufio_client *c); int dm_bufio_issue_flush(struct dm_bufio_client *c); /* + * Send a discard request to the underlying device. + */ +int dm_bufio_issue_discard(struct dm_bufio_client *c, sector_t block, sector_t count); + +/* * Like dm_bufio_release but also move the buffer to the new * block. dm_bufio_write_dirty_buffers is needed to commit the new block. */ @@ -132,12 +143,20 @@ void dm_bufio_release_move(struct dm_buffer *b, sector_t new_block); void dm_bufio_forget(struct dm_bufio_client *c, sector_t block); /* + * Free the given range of buffers. + * This is just a hint, if the buffer is in use or dirty, this function + * does nothing. + */ +void dm_bufio_forget_buffers(struct dm_bufio_client *c, sector_t block, sector_t n_blocks); + +/* * Set the minimum number of buffers before cleanup happens. */ void dm_bufio_set_minimum_buffers(struct dm_bufio_client *c, unsigned n); unsigned dm_bufio_get_block_size(struct dm_bufio_client *c); sector_t dm_bufio_get_device_size(struct dm_bufio_client *c); +struct dm_io_client *dm_bufio_get_dm_io_client(struct dm_bufio_client *c); sector_t dm_bufio_get_block_number(struct dm_buffer *b); void *dm_bufio_get_block_data(struct dm_buffer *b); void *dm_bufio_get_aux_data(struct dm_buffer *b); |