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[SCSI] osd_uld: API for retrieving osd devices from Kernel

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Kernel clients like exofs can retrieve struct osd_dev(s)
by means of below API.

+ osduld_path_lookup() - given a path (e.g "/dev/osd0") locks and
returns the corresponding struct osd_dev, which is then needed
for subsequent libosd use.

+ osduld_put_device() - free up use of an osd_dev.

Devices can be shared by multiple clients. The osd_uld_device's
life time is governed by an embedded kref structure.

The osd_uld_device holds an extra reference to both it's
char-device and it's scsi_device, and will release these just
before the final deallocation.

There are three possible lock sources of the osd_uld_device
1. First and for most is the probe() function called by
  scsi-ml upon a successful login into a target. Released in release()
  when logout.
2. Second by user-mode file handles opened on the char-dev.
3. Third is here by Kernel users.
All three locks must be removed before the osd_uld_device is freed.

The MODULE has three lock sources as well:
1. scsi-ml at probe() time, removed after release(). (login/logout)
2. The user-mode file handles open/close.
3. Import symbols by client modules like exofs.

TODO:
  This API is not enough for the pNFS-objects LD. A more versatile
  API will be needed. Proposed API could be:
  struct osd_dev *osduld_sysid_lookup(const char id[OSD_SYSTEMID_LEN]);

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Boaz Harrosh 2009-01-25 16:58:03 +02:00 committed by James Bottomley
parent 95b05a7db5
commit b799bc7da0
2 changed files with 67 additions and 0 deletions
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63
drivers/scsi/osd/osd_uld.c
View file

@ -173,6 +173,69 @@ static const struct file_operations osd_fops = {
.unlocked_ioctl = osd_uld_ioctl,
};
struct osd_dev *osduld_path_lookup(const char *path)
{
struct nameidata nd;
struct inode *inode;
struct cdev *cdev;
struct osd_uld_device *uninitialized_var(oud);
int error;
if (!path || !*path) {
OSD_ERR("Mount with !path || !*path\n");
return ERR_PTR(-EINVAL);
}
error = path_lookup(path, LOOKUP_FOLLOW, &nd);
if (error) {
OSD_ERR("path_lookup of %s faild=>%d\n", path, error);
return ERR_PTR(error);
}
inode = nd.path.dentry->d_inode;
error = -EINVAL; /* Not the right device e.g osd_uld_device */
if (!S_ISCHR(inode->i_mode)) {
OSD_DEBUG("!S_ISCHR()\n");
goto out;
}
cdev = inode->i_cdev;
if (!cdev) {
OSD_ERR("Before mounting an OSD Based filesystem\n");
OSD_ERR(" user-mode must open+close the %s device\n", path);
OSD_ERR(" Example: bash: echo < %s\n", path);
goto out;
}
/* The Magic wand. Is it our char-dev */
/* TODO: Support sg devices */
if (cdev->owner != THIS_MODULE) {
OSD_ERR("Error mounting %s - is not an OSD device\n", path);
goto out;
}
oud = container_of(cdev, struct osd_uld_device, cdev);
__uld_get(oud);
error = 0;
out:
path_put(&nd.path);
return error ? ERR_PTR(error) : &oud->od;
}
EXPORT_SYMBOL(osduld_path_lookup);
void osduld_put_device(struct osd_dev *od)
{
if (od) {
struct osd_uld_device *oud = container_of(od,
struct osd_uld_device, od);
__uld_put(oud);
}
}
EXPORT_SYMBOL(osduld_put_device);
/*
* Scsi Device operations
*/

4
include/scsi/osd_initiator.h
View file

@ -33,6 +33,10 @@ struct osd_dev {
unsigned def_timeout;
};
/* Retrieve/return osd_dev(s) for use by Kernel clients */
struct osd_dev *osduld_path_lookup(const char *dev_name); /*Use IS_ERR/ERR_PTR*/
void osduld_put_device(struct osd_dev *od);
/* Add/remove test ioctls from external modules */
typedef int (do_test_fn)(struct osd_dev *od, unsigned cmd, unsigned long arg);
int osduld_register_test(unsigned ioctl, do_test_fn *do_test);