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path: root/drivers/scsi/sd.c
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Diffstat (limited to 'drivers/scsi/sd.c')
-rw-r--r--drivers/scsi/sd.c190
1 files changed, 157 insertions, 33 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 930db398d107..c647d85d97d1 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -47,7 +47,6 @@
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/blkpg.h>
-#include <linux/kref.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>
@@ -71,6 +70,27 @@
*/
#define SD_MAJORS 16
+MODULE_AUTHOR("Eric Youngdale");
+MODULE_DESCRIPTION("SCSI disk (sd) driver");
+MODULE_LICENSE("GPL");
+
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
+MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
+
/*
* This is limited by the naming scheme enforced in sd_probe,
* add another character to it if you really need more disks.
@@ -89,12 +109,15 @@
#define SD_MAX_RETRIES 5
#define SD_PASSTHROUGH_RETRIES 1
-static void scsi_disk_release(struct kref *kref);
+/*
+ * Size of the initial data buffer for mode and read capacity data
+ */
+#define SD_BUF_SIZE 512
struct scsi_disk {
struct scsi_driver *driver; /* always &sd_template */
struct scsi_device *device;
- struct kref kref;
+ struct class_device cdev;
struct gendisk *disk;
unsigned int openers; /* protected by BKL for now, yuck */
sector_t capacity; /* size in 512-byte sectors */
@@ -105,6 +128,7 @@ struct scsi_disk {
unsigned RCD : 1; /* state of disk RCD bit, unused */
unsigned DPOFUA : 1; /* state of disk DPOFUA bit */
};
+#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,cdev)
static DEFINE_IDR(sd_index_idr);
static DEFINE_SPINLOCK(sd_index_lock);
@@ -126,6 +150,92 @@ static int sd_issue_flush(struct device *, sector_t *);
static void sd_prepare_flush(request_queue_t *, struct request *);
static void sd_read_capacity(struct scsi_disk *sdkp, char *diskname,
unsigned char *buffer);
+static void scsi_disk_release(struct class_device *cdev);
+
+static const char *sd_cache_types[] = {
+ "write through", "none", "write back",
+ "write back, no read (daft)"
+};
+
+static ssize_t sd_store_cache_type(struct class_device *cdev, const char *buf,
+ size_t count)
+{
+ int i, ct = -1, rcd, wce, sp;
+ struct scsi_disk *sdkp = to_scsi_disk(cdev);
+ struct scsi_device *sdp = sdkp->device;
+ char buffer[64];
+ char *buffer_data;
+ struct scsi_mode_data data;
+ struct scsi_sense_hdr sshdr;
+ int len;
+
+ if (sdp->type != TYPE_DISK)
+ /* no cache control on RBC devices; theoretically they
+ * can do it, but there's probably so many exceptions
+ * it's not worth the risk */
+ return -EINVAL;
+
+ for (i = 0; i < sizeof(sd_cache_types)/sizeof(sd_cache_types[0]); i++) {
+ const int len = strlen(sd_cache_types[i]);
+ if (strncmp(sd_cache_types[i], buf, len) == 0 &&
+ buf[len] == '\n') {
+ ct = i;
+ break;
+ }
+ }
+ if (ct < 0)
+ return -EINVAL;
+ rcd = ct & 0x01 ? 1 : 0;
+ wce = ct & 0x02 ? 1 : 0;
+ if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
+ SD_MAX_RETRIES, &data, NULL))
+ return -EINVAL;
+ len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
+ data.block_descriptor_length);
+ buffer_data = buffer + data.header_length +
+ data.block_descriptor_length;
+ buffer_data[2] &= ~0x05;
+ buffer_data[2] |= wce << 2 | rcd;
+ sp = buffer_data[0] & 0x80 ? 1 : 0;
+
+ if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
+ SD_MAX_RETRIES, &data, &sshdr)) {
+ if (scsi_sense_valid(&sshdr))
+ scsi_print_sense_hdr(sdkp->disk->disk_name, &sshdr);
+ return -EINVAL;
+ }
+ sd_revalidate_disk(sdkp->disk);
+ return count;
+}
+
+static ssize_t sd_show_cache_type(struct class_device *cdev, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(cdev);
+ int ct = sdkp->RCD + 2*sdkp->WCE;
+
+ return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
+}
+
+static ssize_t sd_show_fua(struct class_device *cdev, char *buf)
+{
+ struct scsi_disk *sdkp = to_scsi_disk(cdev);
+
+ return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
+}
+
+static struct class_device_attribute sd_disk_attrs[] = {
+ __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
+ sd_store_cache_type),
+ __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
+ __ATTR_NULL,
+};
+
+static struct class sd_disk_class = {
+ .name = "scsi_disk",
+ .owner = THIS_MODULE,
+ .release = scsi_disk_release,
+ .class_dev_attrs = sd_disk_attrs,
+};
static struct scsi_driver sd_template = {
.owner = THIS_MODULE,
@@ -169,8 +279,6 @@ static int sd_major(int major_idx)
}
}
-#define to_scsi_disk(obj) container_of(obj,struct scsi_disk,kref)
-
static inline struct scsi_disk *scsi_disk(struct gendisk *disk)
{
return container_of(disk->private_data, struct scsi_disk, driver);
@@ -183,7 +291,7 @@ static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
if (disk->private_data) {
sdkp = scsi_disk(disk);
if (scsi_device_get(sdkp->device) == 0)
- kref_get(&sdkp->kref);
+ class_device_get(&sdkp->cdev);
else
sdkp = NULL;
}
@@ -217,7 +325,7 @@ static void scsi_disk_put(struct scsi_disk *sdkp)
struct scsi_device *sdev = sdkp->device;
mutex_lock(&sd_ref_mutex);
- kref_put(&sdkp->kref, scsi_disk_release);
+ class_device_put(&sdkp->cdev);
scsi_device_put(sdev);
mutex_unlock(&sd_ref_mutex);
}
@@ -1239,7 +1347,7 @@ sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
/*
* read write protect setting, if possible - called only in sd_revalidate_disk()
- * called with buffer of length 512
+ * called with buffer of length SD_BUF_SIZE
*/
static void
sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
@@ -1297,7 +1405,7 @@ sd_read_write_protect_flag(struct scsi_disk *sdkp, char *diskname,
/*
* sd_read_cache_type - called only from sd_revalidate_disk()
- * called with buffer of length 512
+ * called with buffer of length SD_BUF_SIZE
*/
static void
sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
@@ -1328,6 +1436,12 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
if (!scsi_status_is_good(res))
goto bad_sense;
+ if (!data.header_length) {
+ modepage = 6;
+ printk(KERN_ERR "%s: missing header in MODE_SENSE response\n",
+ diskname);
+ }
+
/* that went OK, now ask for the proper length */
len = data.length;
@@ -1342,18 +1456,22 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
/* Take headers and block descriptors into account */
len += data.header_length + data.block_descriptor_length;
+ if (len > SD_BUF_SIZE)
+ goto bad_sense;
/* Get the data */
res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
if (scsi_status_is_good(res)) {
- const char *types[] = {
- "write through", "none", "write back",
- "write back, no read (daft)"
- };
int ct = 0;
int offset = data.header_length + data.block_descriptor_length;
+ if (offset >= SD_BUF_SIZE - 2) {
+ printk(KERN_ERR "%s: malformed MODE SENSE response",
+ diskname);
+ goto defaults;
+ }
+
if ((buffer[offset] & 0x3f) != modepage) {
printk(KERN_ERR "%s: got wrong page\n", diskname);
goto defaults;
@@ -1377,7 +1495,7 @@ sd_read_cache_type(struct scsi_disk *sdkp, char *diskname,
ct = sdkp->RCD + 2*sdkp->WCE;
printk(KERN_NOTICE "SCSI device %s: drive cache: %s%s\n",
- diskname, types[ct],
+ diskname, sd_cache_types[ct],
sdkp->DPOFUA ? " w/ FUA" : "");
return;
@@ -1398,6 +1516,7 @@ defaults:
diskname);
sdkp->WCE = 0;
sdkp->RCD = 0;
+ sdkp->DPOFUA = 0;
}
/**
@@ -1421,7 +1540,7 @@ static int sd_revalidate_disk(struct gendisk *disk)
if (!scsi_device_online(sdp))
goto out;
- buffer = kmalloc(512, GFP_KERNEL | __GFP_DMA);
+ buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA);
if (!buffer) {
printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation "
"failure.\n");
@@ -1503,13 +1622,10 @@ static int sd_probe(struct device *dev)
"sd_attach\n"));
error = -ENOMEM;
- sdkp = kmalloc(sizeof(*sdkp), GFP_KERNEL);
+ sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
if (!sdkp)
goto out;
- memset (sdkp, 0, sizeof(*sdkp));
- kref_init(&sdkp->kref);
-
gd = alloc_disk(16);
if (!gd)
goto out_free;
@@ -1526,7 +1642,16 @@ static int sd_probe(struct device *dev)
if (error)
goto out_put;
+ class_device_initialize(&sdkp->cdev);
+ sdkp->cdev.dev = &sdp->sdev_gendev;
+ sdkp->cdev.class = &sd_disk_class;
+ strncpy(sdkp->cdev.class_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
+
+ if (class_device_add(&sdkp->cdev))
+ goto out_put;
+
get_device(&sdp->sdev_gendev);
+
sdkp->device = sdp;
sdkp->driver = &sd_template;
sdkp->disk = gd;
@@ -1558,8 +1683,6 @@ static int sd_probe(struct device *dev)
'a' + m1, 'a' + m2, 'a' + m3);
}
- strcpy(gd->devfs_name, sdp->devfs_name);
-
gd->private_data = &sdkp->driver;
gd->queue = sdkp->device->request_queue;
@@ -1578,11 +1701,11 @@ static int sd_probe(struct device *dev)
return 0;
-out_put:
+ out_put:
put_disk(gd);
-out_free:
+ out_free:
kfree(sdkp);
-out:
+ out:
return error;
}
@@ -1601,12 +1724,13 @@ static int sd_remove(struct device *dev)
{
struct scsi_disk *sdkp = dev_get_drvdata(dev);
+ class_device_del(&sdkp->cdev);
del_gendisk(sdkp->disk);
sd_shutdown(dev);
mutex_lock(&sd_ref_mutex);
dev_set_drvdata(dev, NULL);
- kref_put(&sdkp->kref, scsi_disk_release);
+ class_device_put(&sdkp->cdev);
mutex_unlock(&sd_ref_mutex);
return 0;
@@ -1614,16 +1738,16 @@ static int sd_remove(struct device *dev)
/**
* scsi_disk_release - Called to free the scsi_disk structure
- * @kref: pointer to embedded kref
+ * @cdev: pointer to embedded class device
*
* sd_ref_mutex must be held entering this routine. Because it is
* called on last put, you should always use the scsi_disk_get()
* scsi_disk_put() helpers which manipulate the semaphore directly
- * and never do a direct kref_put().
+ * and never do a direct class_device_put().
**/
-static void scsi_disk_release(struct kref *kref)
+static void scsi_disk_release(struct class_device *cdev)
{
- struct scsi_disk *sdkp = to_scsi_disk(kref);
+ struct scsi_disk *sdkp = to_scsi_disk(cdev);
struct gendisk *disk = sdkp->disk;
spin_lock(&sd_index_lock);
@@ -1677,6 +1801,8 @@ static int __init init_sd(void)
if (!majors)
return -ENODEV;
+ class_register(&sd_disk_class);
+
return scsi_register_driver(&sd_template.gendrv);
}
@@ -1694,11 +1820,9 @@ static void __exit exit_sd(void)
scsi_unregister_driver(&sd_template.gendrv);
for (i = 0; i < SD_MAJORS; i++)
unregister_blkdev(sd_major(i), "sd");
-}
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Eric Youngdale");
-MODULE_DESCRIPTION("SCSI disk (sd) driver");
+ class_unregister(&sd_disk_class);
+}
module_init(init_sd);
module_exit(exit_sd);
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-26 15:42:38 +0300