Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d7b8bcb0a0819315a51cae620ff7ae0c1704c069
Commit: d7b8bcb0a0819315a51cae620ff7ae0c1704c069
Parent: 44ec95425c1d9dce6e4638c29e4362cfb44814e7
Author: Michael Tokarev <[EMAIL PROTECTED]>
AuthorDate: Fri Oct 27 16:02:37 2006 +0400
Committer: James Bottomley <[EMAIL PROTECTED]>
CommitDate: Tue Apr 17 18:15:04 2007 -0400
[SCSI] modalias for scsi devices
The following patch adds support for sysfs/uevent modalias
attribute for scsi devices (like disks, tapes, cdroms etc),
based on whatever current sd.c, sr.c, st.c and osst.c drivers
supports.
The modalias format is like this:
scsi:type-0x04
(for TYPE_WORM, handled by sr.c now).
Several comments.
o This hexadecimal type value is because all TYPE_XXX constants
in include/scsi/scsi.h are given in hex, but __stringify() will
not convert them to decimal (so it will NOT be scsi:type-4).
Since it does not really matter in which format it is, while
both modalias in module and modalias attribute match each other,
I descided to go for that 0x%02x format (and added a comment in
include/scsi/scsi.h to keep them that way), instead of changing
them all to decimal.
o There was no .uevent routine for SCSI bus. It might be a good
idea to add some more ueven environment variables in there.
o osst.c driver handles tapes too, like st.c, but only SOME tapes.
With this setup, hotplug scripts (or whatever is used by the
user) will try to load both st and osst modules for all SCSI
tapes found, because both modules have scsi:type-0x01 alias).
It is not harmful, but one extra module is no good either.
It is possible to solve this, by exporting more info in
modalias attribute, including vendor and device identification
strings, so that modalias becomes something like
scsi:type-0x12:vendor-Adaptec LTD:device-OnStream Tape Drive
and having that, match for all 3 attributes, not only device
type. But oh well, vendor and device strings may be large,
and they do contain spaces and whatnot.
So I left them for now, awaiting for comments first.
Signed-off-by: Michael Tokarev <[EMAIL PROTECTED]>
Signed-off-by: James Bottomley <[EMAIL PROTECTED]>
---
drivers/scsi/osst.c | 1 +
drivers/scsi/scsi_sysfs.c | 23 +++++++++++++++++++++++
drivers/scsi/sd.c | 3 +++
drivers/scsi/sr.c | 2 ++
drivers/scsi/st.c | 1 +
include/scsi/scsi.h | 1 +
include/scsi/scsi_device.h | 5 +++++
7 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index a967fad..08060fb 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -87,6 +87,7 @@ MODULE_AUTHOR("Willem Riede");
MODULE_DESCRIPTION("OnStream {DI-|FW-|SC-|USB}{30|50} Tape Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(OSST_MAJOR);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
module_param(max_dev, int, 0444);
MODULE_PARM_DESC(max_dev, "Maximum number of OnStream Tape Drives to attach
(4)");
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 96db51c..5326f5c 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -276,6 +276,19 @@ static int scsi_bus_match(struct device *dev, struct
device_driver *gendrv)
return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
}
+static int scsi_bus_uevent(struct device *dev, char **envp, int num_envp,
+ char *buffer, int buffer_size)
+{
+ struct scsi_device *sdev = to_scsi_device(dev);
+ int i = 0;
+ int length = 0;
+
+ add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
+ "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
+ envp[i] = NULL;
+ return 0;
+}
+
static int scsi_bus_suspend(struct device * dev, pm_message_t state)
{
struct device_driver *drv = dev->driver;
@@ -331,6 +344,7 @@ static int scsi_bus_resume(struct device * dev)
struct bus_type scsi_bus_type = {
.name = "scsi",
.match = scsi_bus_match,
+ .uevent = scsi_bus_uevent,
.suspend = scsi_bus_suspend,
.resume = scsi_bus_resume,
};
@@ -558,6 +572,14 @@ show_sdev_iostat(iorequest_cnt);
show_sdev_iostat(iodone_cnt);
show_sdev_iostat(ioerr_cnt);
+static ssize_t
+sdev_show_modalias(struct device *dev, struct device_attribute *attr, char
*buf)
+{
+ struct scsi_device *sdev;
+ sdev = to_scsi_device(dev);
+ return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
+}
+static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
/* Default template for device attributes. May NOT be modified */
static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
@@ -577,6 +599,7 @@ static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
&dev_attr_iorequest_cnt,
&dev_attr_iodone_cnt,
&dev_attr_ioerr_cnt,
+ &dev_attr_modalias,
NULL
};
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index b044dcf..00e4666 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -82,6 +82,9 @@ 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);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
static DEFINE_IDR(sd_index_idr);
static DEFINE_SPINLOCK(sd_index_lock);
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 1857d68..f9a52af 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -62,6 +62,8 @@
MODULE_DESCRIPTION("SCSI cdrom (sr) driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
#define SR_DISKS 256
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 98d8411..55bfecc 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -89,6 +89,7 @@ MODULE_AUTHOR("Kai Makisara");
MODULE_DESCRIPTION("SCSI tape (st) driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR);
+MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE);
/* Set 'perm' (4th argument) to 0 to disable module_param's definition
* of sysfs parameters (which module_param doesn't yet support).
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 5c0e979..9f8f80a 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -203,6 +203,7 @@ static inline int scsi_status_is_good(int status)
/*
* DEVICE TYPES
+ * Please keep them in 0x%02x format for $MODALIAS to work
*/
#define TYPE_DISK 0x00
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index b05cd3b..2f3c5b8 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -358,4 +358,9 @@ static inline int scsi_device_qas(struct scsi_device *sdev)
return 0;
return sdev->inquiry[56] & 0x02;
}
+
+#define MODULE_ALIAS_SCSI_DEVICE(type) \
+ MODULE_ALIAS("scsi:t-" __stringify(type) "*")
+#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
+
#endif /* _SCSI_SCSI_DEVICE_H */
-
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