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target/file: Add fd_do_unmap() helper 

Add helper fd_do_unmap() to remove duplicated code in
fd_execute_write_same_unmap() and fd_execute_unmap().

Cc: Christoph Hellwig <hch@lst.de>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Asias He <asias@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Asias He 2013-02-25 14:03:44 +08:00 committed by Nicholas Bellinger
parent 506427628a
commit 43f55bbb14
1 changed files with 30 additions and 42 deletions
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72
drivers/target/target_core_file.c
View File

@ -480,25 +480,16 @@ fd_execute_write_same(struct se_cmd *cmd)
}
static sense_reason_t
fd_execute_write_same_unmap(struct se_cmd *cmd)
fd_do_unmap(struct se_cmd *cmd, struct file *file, sector_t lba, sector_t nolb)
{
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,
ret = blkdev_issue_discard(bdev, lba,
nolb, GFP_KERNEL, 0);
if (ret < 0) {
pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n",
@ -507,7 +498,8 @@ fd_execute_write_same_unmap(struct se_cmd *cmd)
}
} else {
/* The backend is normal file, use fallocate */
loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size;
struct se_device *se_dev = cmd->se_dev;
loff_t pos = 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;
@ -521,6 +513,28 @@ fd_execute_write_same_unmap(struct se_cmd *cmd)
}
}
return 0;
}
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;
sector_t lba = cmd->t_task_lba;
sector_t nolb = sbc_get_write_same_sectors(cmd);
int ret;
if (!nolb) {
target_complete_cmd(cmd, SAM_STAT_GOOD);
return 0;
}
ret = fd_do_unmap(cmd, file, lba, nolb);
if (ret)
return ret;
target_complete_cmd(cmd, GOOD);
return 0;
}
@ -531,13 +545,12 @@ fd_execute_unmap(struct se_cmd *cmd)
struct se_device *dev = cmd->se_dev;
struct fd_dev *fd_dev = FD_DEV(dev);
struct file *file = fd_dev->fd_file;
struct inode *inode = file->f_mapping->host;
unsigned char *buf, *ptr = NULL;
sector_t lba;
int size;
u32 range;
sense_reason_t ret = 0;
int dl, bd_dl, err;
int dl, bd_dl;
/* We never set ANC_SUP */
if (cmd->t_task_cdb[1])
@ -594,34 +607,9 @@ fd_execute_unmap(struct se_cmd *cmd)
goto err;
}
if (S_ISBLK(inode->i_mode)) {
/* The backend is block device, use discard */
struct block_device *bdev = inode->i_bdev;
err = blkdev_issue_discard(bdev, lba, range, GFP_KERNEL, 0);
if (err < 0) {
pr_err("FILEIO: blkdev_issue_discard() failed: %d\n",
err);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto err;
}
} else {
/* The backend is normal file, use fallocate */
loff_t pos = lba * dev->dev_attrib.block_size;
unsigned int len = range * dev->dev_attrib.block_size;
int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
if (!file->f_op->fallocate) {
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto err;
}
err = file->f_op->fallocate(file, mode, pos, len);
if (err < 0) {
pr_warn("FILEIO: fallocate() failed: %d\n", err);
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
goto err;
}
}
ret = fd_do_unmap(cmd, file, lba, range);
if (ret)
goto err;
ptr += 16;
size -= 16;