#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/stringify.h>
+#include <linux/namei.h>
#include <linux/stat.h>
#include <linux/miscdevice.h>
#include <linux/log2.h>
#include <linux/kthread.h>
-#include <linux/reboot.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
#include "ubi.h"
/* Maximum length of the 'mtd=' parameter */
#define MTD_PARAM_LEN_MAX 64
+#ifdef CONFIG_MTD_UBI_MODULE
+#define ubi_is_module() 1
+#else
+#define ubi_is_module() 0
+#endif
+
/**
* struct mtd_dev_param - MTD device parameter description data structure.
- * @name: MTD device name or number string
+ * @name: MTD character device node path, MTD device name, or MTD device number
+ * string
* @vid_hdr_offs: VID header offset
*/
struct mtd_dev_param {
};
/* Numbers of elements set in the @mtd_dev_param array */
-static int mtd_devs;
+static int __initdata mtd_devs;
/* MTD devices specification parameters */
-static struct mtd_dev_param mtd_dev_param[UBI_MAX_DEVICES];
+static struct mtd_dev_param __initdata mtd_dev_param[UBI_MAX_DEVICES];
/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
struct class *ubi_class;
static DEFINE_SPINLOCK(ubi_devices_lock);
/* "Show" method for files in '/<sysfs>/class/ubi/' */
-static ssize_t ubi_version_show(struct class *class, char *buf)
+static ssize_t ubi_version_show(struct class *class, struct class_attribute *attr,
+ char *buf)
{
return sprintf(buf, "%d\n", UBI_VERSION);
}
/**
* ubi_sysfs_init - initialize sysfs for an UBI device.
* @ubi: UBI device description object
+ * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
+ * taken
*
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
-static int ubi_sysfs_init(struct ubi_device *ubi)
+static int ubi_sysfs_init(struct ubi_device *ubi, int *ref)
{
int err;
if (err)
return err;
+ *ref = 1;
err = device_create_file(&ubi->dev, &dev_eraseblock_size);
if (err)
return err;
}
/**
- * kill_volumes - destroy all volumes.
+ * kill_volumes - destroy all user volumes.
* @ubi: UBI device description object
*/
static void kill_volumes(struct ubi_device *ubi)
}
/**
- * free_user_volumes - free all user volumes.
- * @ubi: UBI device description object
- *
- * Normally the volumes are freed at the release function of the volume device
- * objects. However, on error paths the volumes have to be freed before the
- * device objects have been initialized.
- */
-static void free_user_volumes(struct ubi_device *ubi)
-{
- int i;
-
- for (i = 0; i < ubi->vtbl_slots; i++)
- if (ubi->volumes[i]) {
- kfree(ubi->volumes[i]->eba_tbl);
- kfree(ubi->volumes[i]);
- }
-}
-
-/**
* uif_init - initialize user interfaces for an UBI device.
* @ubi: UBI device description object
+ * @ref: set to %1 on exit in case of failure if a reference to @ubi->dev was
+ * taken, otherwise set to %0
+ *
+ * This function initializes various user interfaces for an UBI device. If the
+ * initialization fails at an early stage, this function frees all the
+ * resources it allocated, returns an error, and @ref is set to %0. However,
+ * if the initialization fails after the UBI device was registered in the
+ * driver core subsystem, this function takes a reference to @ubi->dev, because
+ * otherwise the release function ('dev_release()') would free whole @ubi
+ * object. The @ref argument is set to %1 in this case. The caller has to put
+ * this reference.
*
* This function returns zero in case of success and a negative error code in
- * case of failure. Note, this function destroys all volumes if it fails.
+ * case of failure.
*/
-static int uif_init(struct ubi_device *ubi)
+static int uif_init(struct ubi_device *ubi, int *ref)
{
int i, err;
dev_t dev;
+ *ref = 0;
sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);
/*
goto out_unreg;
}
- err = ubi_sysfs_init(ubi);
+ err = ubi_sysfs_init(ubi, ref);
if (err)
goto out_sysfs;
out_volumes:
kill_volumes(ubi);
out_sysfs:
+ if (*ref)
+ get_device(&ubi->dev);
ubi_sysfs_close(ubi);
cdev_del(&ubi->cdev);
out_unreg:
if (ubi->mtd->block_isbad && ubi->mtd->block_markbad)
ubi->bad_allowed = 1;
+ if (ubi->mtd->type == MTD_NORFLASH) {
+ ubi_assert(ubi->mtd->writesize == 1);
+ ubi->nor_flash = 1;
+ }
+
ubi->min_io_size = ubi->mtd->writesize;
ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft;
}
/**
- * ubi_reboot_notifier - halt UBI transactions immediately prior to a reboot.
- * @n: reboot notifier object
- * @state: SYS_RESTART, SYS_HALT, or SYS_POWER_OFF
- * @cmd: pointer to command string for RESTART2
- *
- * This function stops the UBI background thread so that the flash device
- * remains quiescent when Linux restarts the system. Any queued work will be
- * discarded, but this function will block until do_work() finishes if an
- * operation is already in progress.
- *
- * This function solves a real-life problem observed on NOR flashes when an
- * PEB erase operation starts, then the system is rebooted before the erase is
- * finishes, and the boot loader gets confused and dies. So we prefer to finish
- * the ongoing operation before rebooting.
- */
-static int ubi_reboot_notifier(struct notifier_block *n, unsigned long state,
- void *cmd)
-{
- struct ubi_device *ubi;
-
- ubi = container_of(n, struct ubi_device, reboot_notifier);
- if (ubi->bgt_thread)
- kthread_stop(ubi->bgt_thread);
- ubi_sync(ubi->ubi_num);
- return NOTIFY_DONE;
-}
-
-/**
* ubi_attach_mtd_dev - attach an MTD device.
* @mtd: MTD device description object
* @ubi_num: number to assign to the new UBI device
int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
{
struct ubi_device *ubi;
- int i, err, do_free = 1;
+ int i, err, ref = 0;
/*
* Check if we already have the same MTD device attached.
goto out_detach;
}
- err = uif_init(ubi);
+ err = uif_init(ubi, &ref);
if (err)
- goto out_nofree;
+ goto out_detach;
ubi->bgt_thread = kthread_create(ubi_thread, ubi, ubi->bgt_name);
if (IS_ERR(ubi->bgt_thread)) {
ubi_msg("number of PEBs reserved for bad PEB handling: %d",
ubi->beb_rsvd_pebs);
ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
+ ubi_msg("image sequence number: %d", ubi->image_seq);
/*
* The below lock makes sure we do not race with 'ubi_thread()' which
wake_up_process(ubi->bgt_thread);
spin_unlock(&ubi->wl_lock);
- /* Flash device priority is 0 - UBI needs to shut down first */
- ubi->reboot_notifier.priority = 1;
- ubi->reboot_notifier.notifier_call = ubi_reboot_notifier;
- register_reboot_notifier(&ubi->reboot_notifier);
-
ubi_devices[ubi_num] = ubi;
ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL);
return ubi_num;
out_uif:
uif_close(ubi);
-out_nofree:
- do_free = 0;
out_detach:
ubi_wl_close(ubi);
- if (do_free)
- free_user_volumes(ubi);
free_internal_volumes(ubi);
vfree(ubi->vtbl);
out_free:
#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
vfree(ubi->dbg_peb_buf);
#endif
- kfree(ubi);
+ if (ref)
+ put_device(&ubi->dev);
+ else
+ kfree(ubi);
return err;
}
* Before freeing anything, we have to stop the background thread to
* prevent it from doing anything on this device while we are freeing.
*/
- unregister_reboot_notifier(&ubi->reboot_notifier);
if (ubi->bgt_thread)
kthread_stop(ubi->bgt_thread);
/*
* Get a reference to the device in order to prevent 'dev_release()'
- * from freeing @ubi object.
+ * from freeing the @ubi object.
*/
get_device(&ubi->dev);
}
/**
- * find_mtd_device - open an MTD device by its name or number.
- * @mtd_dev: name or number of the device
+ * open_mtd_by_chdev - open an MTD device by its character device node path.
+ * @mtd_dev: MTD character device node path
+ *
+ * This helper function opens an MTD device by its character node device path.
+ * Returns MTD device description object in case of success and a negative
+ * error code in case of failure.
+ */
+static struct mtd_info * __init open_mtd_by_chdev(const char *mtd_dev)
+{
+ int err, major, minor, mode;
+ struct path path;
+
+ /* Probably this is an MTD character device node path */
+ err = kern_path(mtd_dev, LOOKUP_FOLLOW, &path);
+ if (err)
+ return ERR_PTR(err);
+
+ /* MTD device number is defined by the major / minor numbers */
+ major = imajor(path.dentry->d_inode);
+ minor = iminor(path.dentry->d_inode);
+ mode = path.dentry->d_inode->i_mode;
+ path_put(&path);
+ if (major != MTD_CHAR_MAJOR || !S_ISCHR(mode))
+ return ERR_PTR(-EINVAL);
+
+ if (minor & 1)
+ /*
+ * Just do not think the "/dev/mtdrX" devices support is need,
+ * so do not support them to avoid doing extra work.
+ */
+ return ERR_PTR(-EINVAL);
+
+ return get_mtd_device(NULL, minor / 2);
+}
+
+/**
+ * open_mtd_device - open MTD device by name, character device path, or number.
+ * @mtd_dev: name, character device node path, or MTD device device number
*
* This function tries to open and MTD device described by @mtd_dev string,
- * which is first treated as an ASCII number, and if it is not true, it is
- * treated as MTD device name. Returns MTD device description object in case of
- * success and a negative error code in case of failure.
+ * which is first treated as ASCII MTD device number, and if it is not true, it
+ * is treated as MTD device name, and if that is also not true, it is treated
+ * as MTD character device node path. Returns MTD device description object in
+ * case of success and a negative error code in case of failure.
*/
static struct mtd_info * __init open_mtd_device(const char *mtd_dev)
{
* MTD device name.
*/
mtd = get_mtd_device_nm(mtd_dev);
+ if (IS_ERR(mtd) && PTR_ERR(mtd) == -ENODEV)
+ /* Probably this is an MTD character device node path */
+ mtd = open_mtd_by_chdev(mtd_dev);
} else
mtd = get_mtd_device(NULL, mtd_num);
p->vid_hdr_offs);
mutex_unlock(&ubi_devices_mutex);
if (err < 0) {
- put_mtd_device(mtd);
ubi_err("cannot attach mtd%d", mtd->index);
- goto out_detach;
+ put_mtd_device(mtd);
+
+ /*
+ * Originally UBI stopped initializing on any error.
+ * However, later on it was found out that this
+ * behavior is not very good when UBI is compiled into
+ * the kernel and the MTD devices to attach are passed
+ * through the command line. Indeed, UBI failure
+ * stopped whole boot sequence.
+ *
+ * To fix this, we changed the behavior for the
+ * non-module case, but preserved the old behavior for
+ * the module case, just for compatibility. This is a
+ * little inconsistent, though.
+ */
+ if (ubi_is_module())
+ goto out_detach;
}
}
unsigned long result;
result = simple_strtoul(str, &endp, 0);
- if (str == endp || result < 0) {
+ if (str == endp || result >= INT_MAX) {
printk(KERN_ERR "UBI error: incorrect bytes count: \"%s\"\n",
str);
return -EINVAL;
module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: "
- "mtd=<name|num>[,<vid_hdr_offs>].\n"
+ "mtd=<name|num|path>[,<vid_hdr_offs>].\n"
"Multiple \"mtd\" parameters may be specified.\n"
- "MTD devices may be specified by their number or name.\n"
+ "MTD devices may be specified by their number, name, or "
+ "path to the MTD character device node.\n"
"Optional \"vid_hdr_offs\" parameter specifies UBI VID "
- "header position and data starting position to be used "
- "by UBI.\n"
- "Example: mtd=content,1984 mtd=4 - attach MTD device"
+ "header position to be used by UBI.\n"
+ "Example 1: mtd=/dev/mtd0 - attach MTD device "
+ "/dev/mtd0.\n"
+ "Example 2: mtd=content,1984 mtd=4 - attach MTD device "
"with name \"content\" using VID header offset 1984, and "
"MTD device number 4 with default VID header offset.");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff