diff options
Diffstat (limited to 'common/block.c')
-rw-r--r-- | common/block.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/common/block.c b/common/block.c index 97cf5dc4de..02be80d7cc 100644 --- a/common/block.c +++ b/common/block.c @@ -36,7 +36,7 @@ struct chunk { struct list_head list; }; -#define BUFSIZE (PAGE_SIZE * 4) +#define BUFSIZE (PAGE_SIZE * 16) static int writebuffer_io_len(struct block_device *blk, struct chunk *chunk) { @@ -161,6 +161,14 @@ static int block_cache(struct block_device *blk, int block) dev_dbg(blk->dev, "%s: %d to %d\n", __func__, chunk->block_start, chunk->num); + if (chunk->block_start * BLOCKSIZE(blk) >= blk->discard_start && + chunk->block_start * BLOCKSIZE(blk) + writebuffer_io_len(blk, chunk) + <= blk->discard_start + blk->discard_size) { + memset(chunk->data, 0, writebuffer_io_len(blk, chunk)); + list_add(&chunk->list, &blk->buffered_blocks); + return 0; + } + ret = blk->ops->read(blk, chunk->data, chunk->block_start, writebuffer_io_len(blk, chunk)); if (ret) { @@ -337,11 +345,23 @@ static int block_op_flush(struct cdev *cdev) { struct block_device *blk = cdev->priv; + blk->discard_start = blk->discard_size = 0; + return writebuffer_flush(blk); } static int block_op_close(struct cdev *cdev) __alias(block_op_flush); +static int block_op_discard_range(struct cdev *cdev, loff_t count, loff_t offset) +{ + struct block_device *blk = cdev->priv; + + blk->discard_start = offset; + blk->discard_size = count; + + return 0; +} + static struct cdev_operations block_ops = { .read = block_op_read, #ifdef CONFIG_BLOCK_WRITE @@ -349,6 +369,7 @@ static struct cdev_operations block_ops = { #endif .close = block_op_close, .flush = block_op_flush, + .discard_range = block_op_discard_range, }; int blockdevice_register(struct block_device *blk) @@ -370,7 +391,7 @@ int blockdevice_register(struct block_device *blk) dev_dbg(blk->dev, "rdbufsize: %d blockbits: %d blkmask: 0x%08x\n", blk->rdbufsize, blk->blockbits, blk->blkmask); - for (i = 0; i < 32; i++) { + for (i = 0; i < 8; i++) { struct chunk *chunk = xzalloc(sizeof(*chunk)); chunk->data = dma_alloc(BUFSIZE); chunk->num = i; |