diff options
Diffstat (limited to 'drivers/s390/block/dcssblk.c')
| -rw-r--r-- | drivers/s390/block/dcssblk.c | 72 |
1 files changed, 54 insertions, 18 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index a66b17b65296..4fde41188996 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -35,26 +35,29 @@ static int dcssblk_open(struct inode *inode, struct file *filp); static int dcssblk_release(struct inode *inode, struct file *filp); static int dcssblk_make_request(struct request_queue *q, struct bio *bio); +static int dcssblk_direct_access(struct block_device *bdev, sector_t secnum, + unsigned long *data); static char dcssblk_segments[DCSSBLK_PARM_LEN] = "\0"; static int dcssblk_major; static struct block_device_operations dcssblk_devops = { - .owner = THIS_MODULE, - .open = dcssblk_open, - .release = dcssblk_release, + .owner = THIS_MODULE, + .open = dcssblk_open, + .release = dcssblk_release, + .direct_access = dcssblk_direct_access, }; -static ssize_t dcssblk_add_store(struct device * dev, const char * buf, +static ssize_t dcssblk_add_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count); -static ssize_t dcssblk_remove_store(struct device * dev, const char * buf, +static ssize_t dcssblk_remove_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count); -static ssize_t dcssblk_save_store(struct device * dev, const char * buf, +static ssize_t dcssblk_save_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count); -static ssize_t dcssblk_save_show(struct device *dev, char *buf); -static ssize_t dcssblk_shared_store(struct device * dev, const char * buf, +static ssize_t dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf); +static ssize_t dcssblk_shared_store(struct device * dev, struct device_attribute *attr, const char * buf, size_t count); -static ssize_t dcssblk_shared_show(struct device *dev, char *buf); +static ssize_t dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf); static DEVICE_ATTR(add, S_IWUSR, NULL, dcssblk_add_store); static DEVICE_ATTR(remove, S_IWUSR, NULL, dcssblk_remove_store); @@ -195,7 +198,7 @@ dcssblk_segment_warn(int rc, char* seg_name) * operation (show + store) */ static ssize_t -dcssblk_shared_show(struct device *dev, char *buf) +dcssblk_shared_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dcssblk_dev_info *dev_info; @@ -204,7 +207,7 @@ dcssblk_shared_show(struct device *dev, char *buf) } static ssize_t -dcssblk_shared_store(struct device *dev, const char *inbuf, size_t count) +dcssblk_shared_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) { struct dcssblk_dev_info *dev_info; int rc; @@ -288,7 +291,7 @@ out: * (show + store) */ static ssize_t -dcssblk_save_show(struct device *dev, char *buf) +dcssblk_save_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dcssblk_dev_info *dev_info; @@ -297,7 +300,7 @@ dcssblk_save_show(struct device *dev, char *buf) } static ssize_t -dcssblk_save_store(struct device *dev, const char *inbuf, size_t count) +dcssblk_save_store(struct device *dev, struct device_attribute *attr, const char *inbuf, size_t count) { struct dcssblk_dev_info *dev_info; @@ -343,7 +346,7 @@ dcssblk_save_store(struct device *dev, const char *inbuf, size_t count) * device attribute for adding devices */ static ssize_t -dcssblk_add_store(struct device *dev, const char *buf, size_t count) +dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { int rc, i; struct dcssblk_dev_info *dev_info; @@ -517,7 +520,7 @@ out_nobuf: * device attribute for removing devices */ static ssize_t -dcssblk_remove_store(struct device *dev, const char *buf, size_t count) +dcssblk_remove_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dcssblk_dev_info *dev_info; int rc, i; @@ -641,6 +644,20 @@ dcssblk_make_request(request_queue_t *q, struct bio *bio) /* Request beyond end of DCSS segment. */ goto fail; } + /* verify data transfer direction */ + if (dev_info->is_shared) { + switch (dev_info->segment_type) { + case SEG_TYPE_SR: + case SEG_TYPE_ER: + case SEG_TYPE_SC: + /* cannot write to these segments */ + if (bio_data_dir(bio) == WRITE) { + PRINT_WARN("rejecting write to ro segment %s\n", dev_info->dev.bus_id); + goto fail; + } + } + } + index = (bio->bi_sector >> 3); bio_for_each_segment(bvec, bio, i) { page_addr = (unsigned long) @@ -661,7 +678,26 @@ dcssblk_make_request(request_queue_t *q, struct bio *bio) bio_endio(bio, bytes_done, 0); return 0; fail: - bio_io_error(bio, bytes_done); + bio_io_error(bio, bio->bi_size); + return 0; +} + +static int +dcssblk_direct_access (struct block_device *bdev, sector_t secnum, + unsigned long *data) +{ + struct dcssblk_dev_info *dev_info; + unsigned long pgoff; + + dev_info = bdev->bd_disk->private_data; + if (!dev_info) + return -ENODEV; + if (secnum % (PAGE_SIZE/512)) + return -EINVAL; + pgoff = secnum / (PAGE_SIZE / 512); + if ((pgoff+1)*PAGE_SIZE-1 > dev_info->end - dev_info->start) + return -ERANGE; + *data = (unsigned long) (dev_info->start+pgoff*PAGE_SIZE); return 0; } @@ -682,7 +718,7 @@ dcssblk_check_params(void) buf[j-i] = dcssblk_segments[j]; } buf[j-i] = '\0'; - rc = dcssblk_add_store(dcssblk_root_dev, buf, j-i); + rc = dcssblk_add_store(dcssblk_root_dev, NULL, buf, j-i); if ((rc >= 0) && (dcssblk_segments[j] == '(')) { for (k = 0; buf[k] != '\0'; k++) buf[k] = toupper(buf[k]); @@ -692,7 +728,7 @@ dcssblk_check_params(void) up_read(&dcssblk_devices_sem); if (dev_info) dcssblk_shared_store(&dev_info->dev, - "0\n", 2); + NULL, "0\n", 2); } } while ((dcssblk_segments[j] != ',') && |
