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UBI: handle attach ioctl

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Actually implement the MTD device attach/detach handlers.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2007-12-18 18:23:39 +02:00
parent 9b79cc0f84
commit 897a316c9e
3 changed files with 135 additions and 42 deletions
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74
drivers/mtd/ubi/build.c
View File

@ -621,18 +621,19 @@ static int io_init(struct ubi_device *ubi)
/**
* ubi_attach_mtd_dev - attach an MTD device.
* @mtd_dev: MTD device description object
* @ubi_num: number to assign to the new UBI device
* @vid_hdr_offset: VID header offset
*
* This function attaches an MTD device to UBI. It first treats @mtd_dev as the
* MTD device name, and tries to open it by this name. If it is unable to open,
* it tries to convert @mtd_dev to an integer and open the MTD device by its
* number. Returns new UBI device's number in case of success and a negative
* error code in case of failure.
* This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
* to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
* which case this function finds a vacant device nubert and assings it
* automatically. Returns the new UBI device number in case of success and a
* negative error code in case of failure.
*
* Note, the invocations of this function has to be serialized by the
* @ubi_devices_mutex.
*/
int ubi_attach_mtd_dev(struct mtd_info *mtd, int vid_hdr_offset)
int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
{
struct ubi_device *ubi;
int i, err;
@ -643,34 +644,59 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int vid_hdr_offset)
* Note, this function assumes that UBI devices creations and deletions
* are serialized, so it does not take the &ubi_devices_lock.
*/
for (i = 0; i < UBI_MAX_DEVICES; i++)
for (i = 0; i < UBI_MAX_DEVICES; i++) {
ubi = ubi_devices[i];
if (ubi && mtd->index == ubi->mtd->index) {
ubi_err("mtd%d is already attached to ubi%d",
dbg_err("mtd%d is already attached to ubi%d",
mtd->index, i);
return -EEXIST;
}
}
/*
* Make sure this MTD device is not emulated on top of an UBI volume
* already. Well, generally this recursion works fine, but there are
* different problems like the UBI module takes a reference to itself
* by attaching (and thus, opening) the emulated MTD device. This
* results in inability to unload the module. And in general it makes
* no sense to attach emulated MTD devices, so we prohibit this.
*/
if (mtd->type == MTD_UBIVOLUME) {
ubi_err("refuse attaching mtd%d - it is already emulated on "
"top of UBI", mtd->index);
return -EINVAL;
}
if (ubi_num == UBI_DEV_NUM_AUTO) {
/* Search for an empty slot in the @ubi_devices array */
for (i = 0; i < UBI_MAX_DEVICES; i++)
if (!ubi_devices[i])
for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++)
if (!ubi_devices[ubi_num])
break;
if (i == UBI_MAX_DEVICES) {
ubi_err("only %d UBI devices may be created", UBI_MAX_DEVICES);
if (ubi_num == UBI_MAX_DEVICES) {
dbg_err("only %d UBI devices may be created", UBI_MAX_DEVICES);
return -ENFILE;
}
} else {
if (ubi_num >= UBI_MAX_DEVICES)
return -EINVAL;
/* Make sure ubi_num is not busy */
if (ubi_devices[ubi_num]) {
dbg_err("ubi%d already exists", ubi_num);
return -EEXIST;
}
}
ubi = kzalloc(sizeof(struct ubi_device), GFP_KERNEL);
if (!ubi)
return -ENOMEM;
ubi->mtd = mtd;
ubi->ubi_num = i;
ubi->ubi_num = ubi_num;
ubi->vid_hdr_offset = vid_hdr_offset;
dbg_msg("attaching mtd%d to ubi%d: VID header offset %d",
mtd->index, ubi->ubi_num, vid_hdr_offset);
mtd->index, ubi_num, vid_hdr_offset);
err = io_init(ubi);
if (err)
@ -710,7 +736,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int vid_hdr_offset)
goto out_uif;
}
ubi_msg("attached mtd%d to ubi%d", mtd->index, ubi->ubi_num);
ubi_msg("attached mtd%d to ubi%d", mtd->index, ubi_num);
ubi_msg("MTD device name: \"%s\"", mtd->name);
ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20);
ubi_msg("physical eraseblock size: %d bytes (%d KiB)",
@ -739,8 +765,8 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int vid_hdr_offset)
wake_up_process(ubi->bgt_thread);
}
ubi_devices[ubi->ubi_num] = ubi;
return ubi->ubi_num;
ubi_devices[ubi_num] = ubi;
return ubi_num;
out_uif:
uif_close(ubi);
@ -781,23 +807,24 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
spin_lock(&ubi_devices_lock);
ubi = ubi_devices[ubi_num];
if (!ubi) {
spin_lock(&ubi_devices_lock);
spin_unlock(&ubi_devices_lock);
return -EINVAL;
}
if (ubi->ref_count) {
if (!anyway) {
spin_lock(&ubi_devices_lock);
spin_unlock(&ubi_devices_lock);
return -EBUSY;
}
/* This may only happen if there is a bug */
ubi_err("%s reference count %d, destroy anyway",
ubi->ubi_name, ubi->ref_count);
}
ubi_devices[ubi->ubi_num] = NULL;
ubi_devices[ubi_num] = NULL;
spin_unlock(&ubi_devices_lock);
dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi->ubi_num);
ubi_assert(ubi_num == ubi->ubi_num);
dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
/*
* Before freeing anything, we have to stop the background thread to
@ -935,7 +962,8 @@ static int __init ubi_init(void)
}
mutex_lock(&ubi_devices_mutex);
err = ubi_attach_mtd_dev(mtd, p->vid_hdr_offs);
err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO,
p->vid_hdr_offs);
mutex_unlock(&ubi_devices_mutex);
if (err < 0) {
put_mtd_device(mtd);

95
drivers/mtd/ubi/cdev.c
View File

@ -44,17 +44,6 @@
#include <asm/div64.h>
#include "ubi.h"
/*
* Maximum sequence numbers of UBI and volume character device IOCTLs (direct
* logical eraseblock erase is a debug-only feature).
*/
#define UBI_CDEV_IOC_MAX_SEQ 2
#ifndef CONFIG_MTD_UBI_DEBUG_USERSPACE_IO
#define VOL_CDEV_IOC_MAX_SEQ 1
#else
#define VOL_CDEV_IOC_MAX_SEQ 2
#endif
/**
* get_exclusive - get exclusive access to an UBI volume.
* @desc: volume descriptor
@ -582,8 +571,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
struct ubi_mkvol_req req;
dbg_msg("create volume");
err = copy_from_user(&req, argp,
sizeof(struct ubi_mkvol_req));
err = copy_from_user(&req, argp, sizeof(struct ubi_mkvol_req));
if (err) {
err = -EFAULT;
break;
@ -647,8 +635,7 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
struct ubi_rsvol_req req;
dbg_msg("re-size volume");
err = copy_from_user(&req, argp,
sizeof(struct ubi_rsvol_req));
err = copy_from_user(&req, argp, sizeof(struct ubi_rsvol_req));
if (err) {
err = -EFAULT;
break;
@ -684,8 +671,86 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
return err;
}
static int ctrl_cdev_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
int err = 0;
void __user *argp = (void __user *)arg;
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
switch (cmd) {
/* Attach an MTD device command */
case UBI_IOCATT:
{
struct ubi_attach_req req;
struct mtd_info *mtd;
dbg_msg("attach MTD device");
err = copy_from_user(&req, argp, sizeof(struct ubi_attach_req));
if (err) {
err = -EFAULT;
break;
}
if (req.mtd_num < 0 ||
(req.ubi_num < 0 && req.ubi_num != UBI_DEV_NUM_AUTO)) {
err = -EINVAL;
break;
}
mtd = get_mtd_device(NULL, req.mtd_num);
if (IS_ERR(mtd)) {
err = PTR_ERR(mtd);
break;
}
/*
* Note, further request verification is done by
* 'ubi_attach_mtd_dev()'.
*/
mutex_lock(&ubi_devices_mutex);
err = ubi_attach_mtd_dev(mtd, req.ubi_num, req.vid_hdr_offset);
mutex_unlock(&ubi_devices_mutex);
if (err < 0)
put_mtd_device(mtd);
else
/* @err contains UBI device number */
err = put_user(err, (__user int32_t *)argp);
break;
}
/* Detach an MTD device command */
case UBI_IOCDET:
{
int ubi_num;
dbg_msg("dettach MTD device");
err = get_user(ubi_num, (__user int32_t *)argp);
if (err) {
err = -EFAULT;
break;
}
mutex_lock(&ubi_devices_mutex);
err = ubi_detach_mtd_dev(ubi_num, 0);
mutex_unlock(&ubi_devices_mutex);
break;
}
default:
err = -ENOTTY;
break;
}
return err;
}
/* UBI control character device operations */
struct file_operations ubi_ctrl_cdev_operations = {
.ioctl = ctrl_cdev_ioctl,
.owner = THIS_MODULE,
};

2
drivers/mtd/ubi/ubi.h
View File

@ -483,7 +483,7 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
struct ubi_vid_hdr *vid_hdr);
/* build.c */
int ubi_attach_mtd_dev(struct mtd_info *mtd, int vid_hdr_offset);
int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset);
int ubi_detach_mtd_dev(int ubi_num, int anyway);
struct ubi_device *ubi_get_device(int ubi_num);
void ubi_put_device(struct ubi_device *ubi);