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-rw-r--r--drivers/mtd/ubi/build.c100
-rw-r--r--drivers/mtd/ubi/cdev.c1
-rw-r--r--drivers/mtd/ubi/kapi.c108
-rw-r--r--drivers/mtd/ubi/ubi.h12
-rw-r--r--drivers/mtd/ubi/vmt.c4
-rw-r--r--include/linux/mtd/ubi.h37
6 files changed, 241 insertions, 21 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index d3da6668266..964a99d48bc 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -122,6 +122,94 @@ static struct device_attribute dev_mtd_num =
__ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL);
/**
+ * ubi_volume_notify - send a volume change notification.
+ * @ubi: UBI device description object
+ * @vol: volume description object of the changed volume
+ * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
+ *
+ * This is a helper function which notifies all subscribers about a volume
+ * change event (creation, removal, re-sizing, re-naming, updating). Returns
+ * zero in case of success and a negative error code in case of failure.
+ */
+int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype)
+{
+ struct ubi_notification nt;
+
+ ubi_do_get_device_info(ubi, &nt.di);
+ ubi_do_get_volume_info(ubi, vol, &nt.vi);
+ return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
+}
+
+/**
+ * ubi_notify_all - send a notification to all volumes.
+ * @ubi: UBI device description object
+ * @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
+ * @nb: the notifier to call
+ *
+ * This function walks all volumes of UBI device @ubi and sends the @ntype
+ * notification for each volume. If @nb is %NULL, then all registered notifiers
+ * are called, otherwise only the @nb notifier is called. Returns the number of
+ * sent notifications.
+ */
+int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb)
+{
+ struct ubi_notification nt;
+ int i, count = 0;
+
+ ubi_do_get_device_info(ubi, &nt.di);
+
+ mutex_lock(&ubi->device_mutex);
+ for (i = 0; i < ubi->vtbl_slots; i++) {
+ /*
+ * Since the @ubi->device is locked, and we are not going to
+ * change @ubi->volumes, we do not have to lock
+ * @ubi->volumes_lock.
+ */
+ if (!ubi->volumes[i])
+ continue;
+
+ ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi);
+ if (nb)
+ nb->notifier_call(nb, ntype, &nt);
+ else
+ blocking_notifier_call_chain(&ubi_notifiers, ntype,
+ &nt);
+ count += 1;
+ }
+ mutex_unlock(&ubi->device_mutex);
+
+ return count;
+}
+
+/**
+ * ubi_enumerate_volumes - send "add" notification for all existing volumes.
+ * @nb: the notifier to call
+ *
+ * This function walks all UBI devices and volumes and sends the
+ * %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all
+ * registered notifiers are called, otherwise only the @nb notifier is called.
+ * Returns the number of sent notifications.
+ */
+int ubi_enumerate_volumes(struct notifier_block *nb)
+{
+ int i, count = 0;
+
+ /*
+ * Since the @ubi_devices_mutex is locked, and we are not going to
+ * change @ubi_devices, we do not have to lock @ubi_devices_lock.
+ */
+ for (i = 0; i < UBI_MAX_DEVICES; i++) {
+ struct ubi_device *ubi = ubi_devices[i];
+
+ if (!ubi)
+ continue;
+ count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb);
+ }
+
+ return count;
+}
+
+/**
* ubi_get_device - get UBI device.
* @ubi_num: UBI device number
*
@@ -891,6 +979,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
spin_unlock(&ubi->wl_lock);
ubi_devices[ubi_num] = ubi;
+ ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL);
return ubi_num;
out_uif:
@@ -933,13 +1022,13 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
return -EINVAL;
- spin_lock(&ubi_devices_lock);
- ubi = ubi_devices[ubi_num];
- if (!ubi) {
- spin_unlock(&ubi_devices_lock);
+ ubi = ubi_get_device(ubi_num);
+ if (!ubi)
return -EINVAL;
- }
+ spin_lock(&ubi_devices_lock);
+ put_device(&ubi->dev);
+ ubi->ref_count -= 1;
if (ubi->ref_count) {
if (!anyway) {
spin_unlock(&ubi_devices_lock);
@@ -953,6 +1042,7 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
spin_unlock(&ubi_devices_lock);
ubi_assert(ubi_num == ubi->ubi_num);
+ ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
/*
diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 9a2b217941f..631983615f1 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -396,6 +396,7 @@ static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
}
vol->checked = 1;
ubi_gluebi_updated(vol);
+ ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
revoke_exclusive(desc, UBI_READWRITE);
}
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 2675207c5fe..88a72e9c8be 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -26,6 +26,24 @@
#include "ubi.h"
/**
+ * ubi_do_get_device_info - get information about UBI device.
+ * @ubi: UBI device description object
+ * @di: the information is stored here
+ *
+ * This function is the same as 'ubi_get_device_info()', but it assumes the UBI
+ * device is locked and cannot disappear.
+ */
+void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di)
+{
+ di->ubi_num = ubi->ubi_num;
+ di->leb_size = ubi->leb_size;
+ di->min_io_size = ubi->min_io_size;
+ di->ro_mode = ubi->ro_mode;
+ di->cdev = ubi->cdev.dev;
+}
+EXPORT_SYMBOL_GPL(ubi_do_get_device_info);
+
+/**
* ubi_get_device_info - get information about UBI device.
* @ubi_num: UBI device number
* @di: the information is stored here
@@ -39,33 +57,24 @@ int ubi_get_device_info(int ubi_num, struct ubi_device_info *di)
if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
return -EINVAL;
-
ubi = ubi_get_device(ubi_num);
if (!ubi)
return -ENODEV;
-
- di->ubi_num = ubi->ubi_num;
- di->leb_size = ubi->leb_size;
- di->min_io_size = ubi->min_io_size;
- di->ro_mode = ubi->ro_mode;
- di->cdev = ubi->cdev.dev;
-
+ ubi_do_get_device_info(ubi, di);
ubi_put_device(ubi);
return 0;
}
EXPORT_SYMBOL_GPL(ubi_get_device_info);
/**
- * ubi_get_volume_info - get information about UBI volume.
- * @desc: volume descriptor
+ * ubi_do_get_volume_info - get information about UBI volume.
+ * @ubi: UBI device description object
+ * @vol: volume description object
* @vi: the information is stored here
*/
-void ubi_get_volume_info(struct ubi_volume_desc *desc,
- struct ubi_volume_info *vi)
+void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
+ struct ubi_volume_info *vi)
{
- const struct ubi_volume *vol = desc->vol;
- const struct ubi_device *ubi = vol->ubi;
-
vi->vol_id = vol->vol_id;
vi->ubi_num = ubi->ubi_num;
vi->size = vol->reserved_pebs;
@@ -79,6 +88,17 @@ void ubi_get_volume_info(struct ubi_volume_desc *desc,
vi->name = vol->name;
vi->cdev = vol->cdev.dev;
}
+
+/**
+ * ubi_get_volume_info - get information about UBI volume.
+ * @desc: volume descriptor
+ * @vi: the information is stored here
+ */
+void ubi_get_volume_info(struct ubi_volume_desc *desc,
+ struct ubi_volume_info *vi)
+{
+ ubi_do_get_volume_info(desc->vol->ubi, desc->vol, vi);
+}
EXPORT_SYMBOL_GPL(ubi_get_volume_info);
/**
@@ -561,7 +581,7 @@ int ubi_leb_unmap(struct ubi_volume_desc *desc, int lnum)
EXPORT_SYMBOL_GPL(ubi_leb_unmap);
/**
- * ubi_leb_map - map logical erasblock to a physical eraseblock.
+ * ubi_leb_map - map logical eraseblock to a physical eraseblock.
* @desc: volume descriptor
* @lnum: logical eraseblock number
* @dtype: expected data type
@@ -659,3 +679,59 @@ int ubi_sync(int ubi_num)
return 0;
}
EXPORT_SYMBOL_GPL(ubi_sync);
+
+BLOCKING_NOTIFIER_HEAD(ubi_notifiers);
+
+/**
+ * ubi_register_volume_notifier - register a volume notifier.
+ * @nb: the notifier description object
+ * @ignore_existing: if non-zero, do not send "added" notification for all
+ * already existing volumes
+ *
+ * This function registers a volume notifier, which means that
+ * 'nb->notifier_call()' will be invoked when an UBI volume is created,
+ * removed, re-sized, re-named, or updated. The first argument of the function
+ * is the notification type. The second argument is pointer to a
+ * &struct ubi_notification object which describes the notification event.
+ * Using UBI API from the volume notifier is prohibited.
+ *
+ * This function returns zero in case of success and a negative error code
+ * in case of failure.
+ */
+int ubi_register_volume_notifier(struct notifier_block *nb,
+ int ignore_existing)
+{
+ int err;
+
+ err = blocking_notifier_chain_register(&ubi_notifiers, nb);
+ if (err != 0)
+ return err;
+ if (ignore_existing)
+ return 0;
+
+ /*
+ * We are going to walk all UBI devices and all volumes, and
+ * notify the user about existing volumes by the %UBI_VOLUME_ADDED
+ * event. We have to lock the @ubi_devices_mutex to make sure UBI
+ * devices do not disappear.
+ */
+ mutex_lock(&ubi_devices_mutex);
+ ubi_enumerate_volumes(nb);
+ mutex_unlock(&ubi_devices_mutex);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(ubi_register_volume_notifier);
+
+/**
+ * ubi_unregister_volume_notifier - unregister the volume notifier.
+ * @nb: the notifier description object
+ *
+ * This function unregisters volume notifier @nm and returns zero in case of
+ * success and a negative error code in case of failure.
+ */
+int ubi_unregister_volume_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&ubi_notifiers, nb);
+}
+EXPORT_SYMBOL_GPL(ubi_unregister_volume_notifier);
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 6d929329a8d..86e1a4e0ab0 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -38,6 +38,7 @@
#include <linux/vmalloc.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/ubi.h>
+#include <linux/notifier.h>
#include "ubi-media.h"
#include "scan.h"
@@ -483,6 +484,7 @@ extern const struct file_operations ubi_cdev_operations;
extern const struct file_operations ubi_vol_cdev_operations;
extern struct class *ubi_class;
extern struct mutex ubi_devices_mutex;
+extern struct blocking_notifier_head ubi_notifiers;
/* vtbl.c */
int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
@@ -575,6 +577,16 @@ struct ubi_device *ubi_get_device(int ubi_num);
void ubi_put_device(struct ubi_device *ubi);
struct ubi_device *ubi_get_by_major(int major);
int ubi_major2num(int major);
+int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol,
+ int ntype);
+int ubi_notify_all(struct ubi_device *ubi, int ntype,
+ struct notifier_block *nb);
+int ubi_enumerate_volumes(struct notifier_block *nb);
+
+/* kapi.c */
+void ubi_do_get_device_info(struct ubi_device *ubi, struct ubi_device_info *di);
+void ubi_do_get_volume_info(struct ubi_device *ubi, struct ubi_volume *vol,
+ struct ubi_volume_info *vi);
/*
* ubi_rb_for_each_entry - walk an RB-tree.
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 8e8d6fae7a0..e151862a3a9 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -358,6 +358,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
ubi->vol_count += 1;
spin_unlock(&ubi->volumes_lock);
+ ubi_volume_notify(ubi, vol, UBI_VOLUME_ADDED);
if (paranoid_check_volumes(ubi))
dbg_err("check failed while creating volume %d", vol_id);
return err;
@@ -466,6 +467,7 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
ubi->vol_count -= 1;
spin_unlock(&ubi->volumes_lock);
+ ubi_volume_notify(ubi, vol, UBI_VOLUME_REMOVED);
if (!no_vtbl && paranoid_check_volumes(ubi))
dbg_err("check failed while removing volume %d", vol_id);
@@ -589,6 +591,7 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
(long long)vol->used_ebs * vol->usable_leb_size;
}
+ ubi_volume_notify(ubi, vol, UBI_VOLUME_RESIZED);
if (paranoid_check_volumes(ubi))
dbg_err("check failed while re-sizing volume %d", vol_id);
return err;
@@ -635,6 +638,7 @@ int ubi_rename_volumes(struct ubi_device *ubi, struct list_head *rename_list)
vol->name_len = re->new_name_len;
memcpy(vol->name, re->new_name, re->new_name_len + 1);
spin_unlock(&ubi->volumes_lock);
+ ubi_volume_notify(ubi, vol, UBI_VOLUME_RENAMED);
}
}
diff --git a/include/linux/mtd/ubi.h b/include/linux/mtd/ubi.h
index 6316fafe5c2..6913b71d9ab 100644
--- a/include/linux/mtd/ubi.h
+++ b/include/linux/mtd/ubi.h
@@ -132,6 +132,39 @@ struct ubi_device_info {
dev_t cdev;
};
+/*
+ * enum - volume notification types.
+ * @UBI_VOLUME_ADDED: volume has been added
+ * @UBI_VOLUME_REMOVED: start volume volume
+ * @UBI_VOLUME_RESIZED: volume size has been re-sized
+ * @UBI_VOLUME_RENAMED: volume name has been re-named
+ * @UBI_VOLUME_UPDATED: volume name has been updated
+ *
+ * These constants define which type of event has happened when a volume
+ * notification function is invoked.
+ */
+enum {
+ UBI_VOLUME_ADDED,
+ UBI_VOLUME_REMOVED,
+ UBI_VOLUME_RESIZED,
+ UBI_VOLUME_RENAMED,
+ UBI_VOLUME_UPDATED,
+};
+
+/*
+ * struct ubi_notification - UBI notification description structure.
+ * @di: UBI device description object
+ * @vi: UBI volume description object
+ *
+ * UBI notifiers are called with a pointer to an object of this type. The
+ * object describes the notification. Namely, it provides a description of the
+ * UBI device and UBI volume the notification informs about.
+ */
+struct ubi_notification {
+ struct ubi_device_info di;
+ struct ubi_volume_info vi;
+};
+
/* UBI descriptor given to users when they open UBI volumes */
struct ubi_volume_desc;
@@ -141,6 +174,10 @@ void ubi_get_volume_info(struct ubi_volume_desc *desc,
struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode);
struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
int mode);
+int ubi_register_volume_notifier(struct notifier_block *nb,
+ int ignore_existing);
+int ubi_unregister_volume_notifier(struct notifier_block *nb);
+
void ubi_close_volume(struct ubi_volume_desc *desc);
int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset,
int len, int check);