diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/target/target_core_file.c | 94 |
1 files changed, 89 insertions, 5 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 17a6acbc3ab0..e1878bfd97b7 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -30,6 +30,7 @@ #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/module.h> +#include <linux/falloc.h> #include <scsi/scsi.h> #include <scsi/scsi_host.h> @@ -166,6 +167,30 @@ static int fd_configure_device(struct se_device *dev) " block_device blocks: %llu logical_block_size: %d\n", dev_size, div_u64(dev_size, fd_dev->fd_block_size), fd_dev->fd_block_size); + /* + * Check if the underlying struct block_device request_queue supports + * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM + * in ATA and we need to set TPE=1 + */ + if (blk_queue_discard(q)) { + dev->dev_attrib.max_unmap_lba_count = + q->limits.max_discard_sectors; + /* + * Currently hardcoded to 1 in Linux/SCSI code.. + */ + dev->dev_attrib.max_unmap_block_desc_count = 1; + dev->dev_attrib.unmap_granularity = + q->limits.discard_granularity >> 9; + dev->dev_attrib.unmap_granularity_alignment = + q->limits.discard_alignment; + pr_debug("IFILE: BLOCK Discard support available," + " disabled by default\n"); + } + /* + * Enable write same emulation for IBLOCK and use 0xFFFF as + * the smaller WRITE_SAME(10) only has a two-byte block count. + */ + dev->dev_attrib.max_write_same_len = 0xFFFF; } else { if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { pr_err("FILEIO: Missing fd_dev_size=" @@ -176,6 +201,23 @@ static int fd_configure_device(struct se_device *dev) dev->dev_attrib.hw_block_size = FD_BLOCKSIZE; dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; + + /* + * Limit UNMAP emulation to 8k Number of LBAs (NoLB) + */ + dev->dev_attrib.max_unmap_lba_count = 0x2000; + /* + * Currently hardcoded to 1 in Linux/SCSI code.. + */ + dev->dev_attrib.max_unmap_block_desc_count = 1; + dev->dev_attrib.unmap_granularity = 1; + dev->dev_attrib.unmap_granularity_alignment = 0; + + /* + * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) + * based upon struct iovec limit for vfs_writev() + */ + dev->dev_attrib.max_write_same_len = 0x1000; } fd_dev->fd_block_size = dev->dev_attrib.hw_block_size; @@ -190,11 +232,6 @@ static int fd_configure_device(struct se_device *dev) fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; fd_dev->fd_queue_depth = dev->queue_depth; - /* - * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) - * based upon struct iovec limit for vfs_writev() - */ - dev->dev_attrib.max_write_same_len = 0x1000; pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, @@ -442,6 +479,52 @@ fd_execute_write_same(struct se_cmd *cmd) } static sense_reason_t +fd_execute_write_same_unmap(struct se_cmd *cmd) +{ + struct se_device *se_dev = cmd->se_dev; + struct fd_dev *fd_dev = FD_DEV(se_dev); + struct file *file = fd_dev->fd_file; + struct inode *inode = file->f_mapping->host; + sector_t nolb = sbc_get_write_same_sectors(cmd); + int ret; + + if (!nolb) { + target_complete_cmd(cmd, SAM_STAT_GOOD); + return 0; + } + + if (S_ISBLK(inode->i_mode)) { + /* The backend is block device, use discard */ + struct block_device *bdev = inode->i_bdev; + + ret = blkdev_issue_discard(bdev, cmd->t_task_lba, + nolb, GFP_KERNEL, 0); + if (ret < 0) { + pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", + ret); + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + } else { + /* The backend is normal file, use fallocate */ + loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; + unsigned int len = nolb * se_dev->dev_attrib.block_size; + int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; + + if (!file->f_op->fallocate) + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + + ret = file->f_op->fallocate(file, mode, pos, len); + if (ret < 0) { + pr_warn("FILEIO: fallocate() failed: %d\n", ret); + return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; + } + } + + target_complete_cmd(cmd, GOOD); + return 0; +} + +static sense_reason_t fd_execute_rw(struct se_cmd *cmd) { struct scatterlist *sgl = cmd->t_data_sg; @@ -600,6 +683,7 @@ static struct sbc_ops fd_sbc_ops = { .execute_rw = fd_execute_rw, .execute_sync_cache = fd_execute_sync_cache, .execute_write_same = fd_execute_write_same, + .execute_write_same_unmap = fd_execute_write_same_unmap, }; static sense_reason_t |