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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.c95
1 files changed, 67 insertions, 28 deletions
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e5e7d785645..c0cf4acda7d 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -86,6 +86,12 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
+#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
+#define SD_MINORS 16
+#else
+#define SD_MINORS 0
+#endif
+
static int sd_revalidate_disk(struct gendisk *);
static int sd_probe(struct device *);
static int sd_remove(struct device *);
@@ -159,7 +165,7 @@ sd_store_cache_type(struct device *dev, struct device_attribute *attr,
sd_print_sense_hdr(sdkp, &sshdr);
return -EINVAL;
}
- sd_revalidate_disk(sdkp->disk);
+ revalidate_disk(sdkp->disk);
return count;
}
@@ -377,7 +383,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
sector_t block = rq->sector;
sector_t threshold;
unsigned int this_count = rq->nr_sectors;
- unsigned int timeout = sdp->timeout;
int ret;
if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
@@ -578,7 +583,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
SCpnt->transfersize = sdp->sector_size;
SCpnt->underflow = this_count << 9;
SCpnt->allowed = SD_MAX_RETRIES;
- SCpnt->timeout_per_command = timeout;
/*
* This indicates that the command is ready from our end to be
@@ -910,7 +914,7 @@ static void sd_rescan(struct device *dev)
struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
if (sdkp) {
- sd_revalidate_disk(sdkp->disk);
+ revalidate_disk(sdkp->disk);
scsi_disk_put(sdkp);
}
}
@@ -1764,6 +1768,52 @@ static int sd_revalidate_disk(struct gendisk *disk)
}
/**
+ * sd_format_disk_name - format disk name
+ * @prefix: name prefix - ie. "sd" for SCSI disks
+ * @index: index of the disk to format name for
+ * @buf: output buffer
+ * @buflen: length of the output buffer
+ *
+ * SCSI disk names starts at sda. The 26th device is sdz and the
+ * 27th is sdaa. The last one for two lettered suffix is sdzz
+ * which is followed by sdaaa.
+ *
+ * This is basically 26 base counting with one extra 'nil' entry
+ * at the beggining from the second digit on and can be
+ * determined using similar method as 26 base conversion with the
+ * index shifted -1 after each digit is computed.
+ *
+ * CONTEXT:
+ * Don't care.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
+{
+ const int base = 'z' - 'a' + 1;
+ char *begin = buf + strlen(prefix);
+ char *end = buf + buflen;
+ char *p;
+ int unit;
+
+ p = end - 1;
+ *p = '\0';
+ unit = base;
+ do {
+ if (p == begin)
+ return -EINVAL;
+ *--p = 'a' + (index % unit);
+ index = (index / unit) - 1;
+ } while (index >= 0);
+
+ memmove(begin, p, end - p);
+ memcpy(buf, prefix, strlen(prefix));
+
+ return 0;
+}
+
+/**
* sd_probe - called during driver initialization and whenever a
* new scsi device is attached to the system. It is called once
* for each scsi device (not just disks) present.
@@ -1801,7 +1851,7 @@ static int sd_probe(struct device *dev)
if (!sdkp)
goto out;
- gd = alloc_disk(16);
+ gd = alloc_disk(SD_MINORS);
if (!gd)
goto out_free;
@@ -1815,8 +1865,8 @@ static int sd_probe(struct device *dev)
if (error)
goto out_put;
- error = -EBUSY;
- if (index >= SD_MAX_DISKS)
+ error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
+ if (error)
goto out_free_index;
sdkp->device = sdp;
@@ -1826,11 +1876,12 @@ static int sd_probe(struct device *dev)
sdkp->openers = 0;
sdkp->previous_state = 1;
- if (!sdp->timeout) {
+ if (!sdp->request_queue->rq_timeout) {
if (sdp->type != TYPE_MOD)
- sdp->timeout = SD_TIMEOUT;
+ blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
else
- sdp->timeout = SD_MOD_TIMEOUT;
+ blk_queue_rq_timeout(sdp->request_queue,
+ SD_MOD_TIMEOUT);
}
device_initialize(&sdkp->dev);
@@ -1843,24 +1894,12 @@ static int sd_probe(struct device *dev)
get_device(&sdp->sdev_gendev);
- gd->major = sd_major((index & 0xf0) >> 4);
- gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
- gd->minors = 16;
- gd->fops = &sd_fops;
-
- if (index < 26) {
- sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
- } else if (index < (26 + 1) * 26) {
- sprintf(gd->disk_name, "sd%c%c",
- 'a' + index / 26 - 1,'a' + index % 26);
- } else {
- const unsigned int m1 = (index / 26 - 1) / 26 - 1;
- const unsigned int m2 = (index / 26 - 1) % 26;
- const unsigned int m3 = index % 26;
- sprintf(gd->disk_name, "sd%c%c%c",
- 'a' + m1, 'a' + m2, 'a' + m3);
+ if (index < SD_MAX_DISKS) {
+ gd->major = sd_major((index & 0xf0) >> 4);
+ gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
+ gd->minors = SD_MINORS;
}
-
+ gd->fops = &sd_fops;
gd->private_data = &sdkp->driver;
gd->queue = sdkp->device->request_queue;
@@ -1869,7 +1908,7 @@ static int sd_probe(struct device *dev)
blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
gd->driverfs_dev = &sdp->sdev_gendev;
- gd->flags = GENHD_FL_DRIVERFS;
+ gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
if (sdp->removable)
gd->flags |= GENHD_FL_REMOVABLE;