diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/md/dm-bufio.h')
-rw-r--r-- | ANDROID_3.4.5/drivers/md/dm-bufio.h | 120 |
1 files changed, 0 insertions, 120 deletions
diff --git a/ANDROID_3.4.5/drivers/md/dm-bufio.h b/ANDROID_3.4.5/drivers/md/dm-bufio.h deleted file mode 100644 index b142946a..00000000 --- a/ANDROID_3.4.5/drivers/md/dm-bufio.h +++ /dev/null @@ -1,120 +0,0 @@ -/* - * Copyright (C) 2009-2011 Red Hat, Inc. - * - * Author: Mikulas Patocka <mpatocka@redhat.com> - * - * This file is released under the GPL. - */ - -#ifndef DM_BUFIO_H -#define DM_BUFIO_H - -#include <linux/blkdev.h> -#include <linux/types.h> - -/*----------------------------------------------------------------*/ - -struct dm_bufio_client; -struct dm_buffer; - -/* - * 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 *)); - -/* - * Release a buffered IO cache. - */ -void dm_bufio_client_destroy(struct dm_bufio_client *c); - -/* - * WARNING: to avoid deadlocks, these conditions are observed: - * - * - At most one thread can hold at most "reserved_buffers" simultaneously. - * - Each other threads can hold at most one buffer. - * - Threads which call only dm_bufio_get can hold unlimited number of - * buffers. - */ - -/* - * Read a given block from disk. Returns pointer to data. Returns a - * pointer to dm_buffer that can be used to release the buffer or to make - * it dirty. - */ -void *dm_bufio_read(struct dm_bufio_client *c, sector_t block, - struct dm_buffer **bp); - -/* - * Like dm_bufio_read, but return buffer from cache, don't read - * it. If the buffer is not in the cache, return NULL. - */ -void *dm_bufio_get(struct dm_bufio_client *c, sector_t block, - struct dm_buffer **bp); - -/* - * Like dm_bufio_read, but don't read anything from the disk. It is - * expected that the caller initializes the buffer and marks it dirty. - */ -void *dm_bufio_new(struct dm_bufio_client *c, sector_t block, - struct dm_buffer **bp); - -/* - * Prefetch the specified blocks to the cache. - * The function starts to read the blocks and returns without waiting for - * I/O to finish. - */ -void dm_bufio_prefetch(struct dm_bufio_client *c, - sector_t block, unsigned n_blocks); - -/* - * Release a reference obtained with dm_bufio_{read,get,new}. The data - * pointer and dm_buffer pointer is no longer valid after this call. - */ -void dm_bufio_release(struct dm_buffer *b); - -/* - * Mark a buffer dirty. It should be called after the buffer is modified. - * - * In case of memory pressure, the buffer may be written after - * dm_bufio_mark_buffer_dirty, but before dm_bufio_write_dirty_buffers. So - * dm_bufio_write_dirty_buffers guarantees that the buffer is on-disk but - * the actual writing may occur earlier. - */ -void dm_bufio_mark_buffer_dirty(struct dm_buffer *b); - -/* - * Initiate writing of dirty buffers, without waiting for completion. - */ -void dm_bufio_write_dirty_buffers_async(struct dm_bufio_client *c); - -/* - * Write all dirty buffers. Guarantees that all dirty buffers created prior - * to this call are on disk when this call exits. - */ -int dm_bufio_write_dirty_buffers(struct dm_bufio_client *c); - -/* - * Send an empty write barrier to the device to flush hardware disk cache. - */ -int dm_bufio_issue_flush(struct dm_bufio_client *c); - -/* - * 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. - */ -void dm_bufio_release_move(struct dm_buffer *b, sector_t new_block); - -unsigned dm_bufio_get_block_size(struct dm_bufio_client *c); -sector_t dm_bufio_get_device_size(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); -struct dm_bufio_client *dm_bufio_get_client(struct dm_buffer *b); - -/*----------------------------------------------------------------*/ - -#endif |