mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
Merge branch 'linux-next' of git://git.infradead.org/ubi-2.6
* 'linux-next' of git://git.infradead.org/ubi-2.6: (21 commits) UBI: add reboot notifier UBI: handle more error codes UBI: fix multiple spelling typos UBI: fix kmem_cache_free on error patch UBI: print amount of reserved PEBs UBI: improve messages in the WL worker UBI: make gluebi a separate module UBI: remove built-in gluebi UBI: add notification API UBI: do not switch to R/O mode on read errors UBI: fix and clean-up error paths in WL worker UBI: introduce new constants UBI: fix race condition UBI: minor serialization fix UBI: do not panic if volume check fails UBI: add dump_stack in checking code UBI: fix races in I/O debugging checks UBI: small debugging code optimization UBI: improve debugging messages UBI: re-name volumes_mutex to device_mutex ...
This commit is contained in:
commit
b069e8ed4d
13 changed files with 921 additions and 334 deletions
|
@ -49,15 +49,16 @@ config MTD_UBI_BEB_RESERVE
|
|||
reserved. Leave the default value if unsure.
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config MTD_UBI_GLUEBI
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bool "Emulate MTD devices"
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tristate "MTD devices emulation driver (gluebi)"
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default n
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depends on MTD_UBI
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help
|
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This option enables MTD devices emulation on top of UBI volumes: for
|
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each UBI volumes an MTD device is created, and all I/O to this MTD
|
||||
device is redirected to the UBI volume. This is handy to make
|
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MTD-oriented software (like JFFS2) work on top of UBI. Do not enable
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this if no legacy software will be used.
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This option enables gluebi - an additional driver which emulates MTD
|
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devices on top of UBI volumes: for each UBI volumes an MTD device is
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created, and all I/O to this MTD device is redirected to the UBI
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volume. This is handy to make MTD-oriented software (like JFFS2)
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work on top of UBI. Do not enable this unless you use legacy
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software.
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source "drivers/mtd/ubi/Kconfig.debug"
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endmenu
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|
|
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@ -4,4 +4,4 @@ ubi-y += vtbl.o vmt.o upd.o build.o cdev.o kapi.o eba.o io.o wl.o scan.o
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ubi-y += misc.o
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ubi-$(CONFIG_MTD_UBI_DEBUG) += debug.o
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ubi-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o
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obj-$(CONFIG_MTD_UBI_GLUEBI) += gluebi.o
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|
|
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@ -41,6 +41,7 @@
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#include <linux/miscdevice.h>
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#include <linux/log2.h>
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#include <linux/kthread.h>
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#include <linux/reboot.h>
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#include "ubi.h"
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/* Maximum length of the 'mtd=' parameter */
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@ -121,6 +122,94 @@ static struct device_attribute dev_bgt_enabled =
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static struct device_attribute dev_mtd_num =
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__ATTR(mtd_num, S_IRUGO, dev_attribute_show, NULL);
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/**
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* ubi_volume_notify - send a volume change notification.
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* @ubi: UBI device description object
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* @vol: volume description object of the changed volume
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* @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
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*
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* This is a helper function which notifies all subscribers about a volume
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* change event (creation, removal, re-sizing, re-naming, updating). Returns
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* zero in case of success and a negative error code in case of failure.
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*/
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int ubi_volume_notify(struct ubi_device *ubi, struct ubi_volume *vol, int ntype)
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{
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struct ubi_notification nt;
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ubi_do_get_device_info(ubi, &nt.di);
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ubi_do_get_volume_info(ubi, vol, &nt.vi);
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return blocking_notifier_call_chain(&ubi_notifiers, ntype, &nt);
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}
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/**
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* ubi_notify_all - send a notification to all volumes.
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* @ubi: UBI device description object
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* @ntype: notification type to send (%UBI_VOLUME_ADDED, etc)
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* @nb: the notifier to call
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*
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* This function walks all volumes of UBI device @ubi and sends the @ntype
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* notification for each volume. If @nb is %NULL, then all registered notifiers
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* are called, otherwise only the @nb notifier is called. Returns the number of
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* sent notifications.
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*/
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int ubi_notify_all(struct ubi_device *ubi, int ntype, struct notifier_block *nb)
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{
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struct ubi_notification nt;
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int i, count = 0;
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ubi_do_get_device_info(ubi, &nt.di);
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mutex_lock(&ubi->device_mutex);
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for (i = 0; i < ubi->vtbl_slots; i++) {
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/*
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* Since the @ubi->device is locked, and we are not going to
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* change @ubi->volumes, we do not have to lock
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* @ubi->volumes_lock.
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*/
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if (!ubi->volumes[i])
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continue;
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ubi_do_get_volume_info(ubi, ubi->volumes[i], &nt.vi);
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if (nb)
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nb->notifier_call(nb, ntype, &nt);
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else
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blocking_notifier_call_chain(&ubi_notifiers, ntype,
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&nt);
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count += 1;
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}
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mutex_unlock(&ubi->device_mutex);
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|
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return count;
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}
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|
||||
/**
|
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* ubi_enumerate_volumes - send "add" notification for all existing volumes.
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* @nb: the notifier to call
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||||
*
|
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* This function walks all UBI devices and volumes and sends the
|
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* %UBI_VOLUME_ADDED notification for each volume. If @nb is %NULL, then all
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* registered notifiers are called, otherwise only the @nb notifier is called.
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* Returns the number of sent notifications.
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*/
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int ubi_enumerate_volumes(struct notifier_block *nb)
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{
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int i, count = 0;
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/*
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* Since the @ubi_devices_mutex is locked, and we are not going to
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* change @ubi_devices, we do not have to lock @ubi_devices_lock.
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*/
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for (i = 0; i < UBI_MAX_DEVICES; i++) {
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struct ubi_device *ubi = ubi_devices[i];
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if (!ubi)
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continue;
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count += ubi_notify_all(ubi, UBI_VOLUME_ADDED, nb);
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}
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return count;
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}
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|
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/**
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* ubi_get_device - get UBI device.
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* @ubi_num: UBI device number
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|
@ -380,7 +469,7 @@ static void free_user_volumes(struct ubi_device *ubi)
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* @ubi: UBI device description object
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*
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* This function returns zero in case of success and a negative error code in
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* case of failure. Note, this function destroys all volumes if it failes.
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* case of failure. Note, this function destroys all volumes if it fails.
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*/
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static int uif_init(struct ubi_device *ubi)
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{
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|
@ -632,6 +721,15 @@ static int io_init(struct ubi_device *ubi)
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|||
return -EINVAL;
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||||
}
|
||||
|
||||
/*
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||||
* Set maximum amount of physical erroneous eraseblocks to be 10%.
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* Erroneous PEB are those which have read errors.
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*/
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ubi->max_erroneous = ubi->peb_count / 10;
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if (ubi->max_erroneous < 16)
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ubi->max_erroneous = 16;
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dbg_msg("max_erroneous %d", ubi->max_erroneous);
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|
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/*
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* It may happen that EC and VID headers are situated in one minimal
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* I/O unit. In this case we can only accept this UBI image in
|
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|
@ -725,6 +823,34 @@ static int autoresize(struct ubi_device *ubi, int vol_id)
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|||
return 0;
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}
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||||
|
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/**
|
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* ubi_reboot_notifier - halt UBI transactions immediately prior to a reboot.
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* @n: reboot notifier object
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* @state: SYS_RESTART, SYS_HALT, or SYS_POWER_OFF
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* @cmd: pointer to command string for RESTART2
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*
|
||||
* This function stops the UBI background thread so that the flash device
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* remains quiescent when Linux restarts the system. Any queued work will be
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* discarded, but this function will block until do_work() finishes if an
|
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* operation is already in progress.
|
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*
|
||||
* This function solves a real-life problem observed on NOR flashes when an
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||||
* PEB erase operation starts, then the system is rebooted before the erase is
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* finishes, and the boot loader gets confused and dies. So we prefer to finish
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* the ongoing operation before rebooting.
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*/
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static int ubi_reboot_notifier(struct notifier_block *n, unsigned long state,
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void *cmd)
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{
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struct ubi_device *ubi;
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|
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ubi = container_of(n, struct ubi_device, reboot_notifier);
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if (ubi->bgt_thread)
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kthread_stop(ubi->bgt_thread);
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||||
ubi_sync(ubi->ubi_num);
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return NOTIFY_DONE;
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||||
}
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|
||||
/**
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* ubi_attach_mtd_dev - attach an MTD device.
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* @mtd: MTD device description object
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|
@ -806,8 +932,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
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|||
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mutex_init(&ubi->buf_mutex);
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mutex_init(&ubi->ckvol_mutex);
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mutex_init(&ubi->mult_mutex);
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mutex_init(&ubi->volumes_mutex);
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mutex_init(&ubi->device_mutex);
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spin_lock_init(&ubi->volumes_lock);
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ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
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|
@ -825,7 +950,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
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if (!ubi->peb_buf2)
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goto out_free;
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#ifdef CONFIG_MTD_UBI_DEBUG
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#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
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mutex_init(&ubi->dbg_buf_mutex);
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ubi->dbg_peb_buf = vmalloc(ubi->peb_size);
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if (!ubi->dbg_peb_buf)
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|
@ -872,11 +997,23 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
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ubi->beb_rsvd_pebs);
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ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
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/*
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* The below lock makes sure we do not race with 'ubi_thread()' which
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* checks @ubi->thread_enabled. Otherwise we may fail to wake it up.
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*/
|
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spin_lock(&ubi->wl_lock);
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if (!DBG_DISABLE_BGT)
|
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ubi->thread_enabled = 1;
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wake_up_process(ubi->bgt_thread);
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spin_unlock(&ubi->wl_lock);
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|
||||
/* Flash device priority is 0 - UBI needs to shut down first */
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ubi->reboot_notifier.priority = 1;
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ubi->reboot_notifier.notifier_call = ubi_reboot_notifier;
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register_reboot_notifier(&ubi->reboot_notifier);
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|
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ubi_devices[ubi_num] = ubi;
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ubi_notify_all(ubi, UBI_VOLUME_ADDED, NULL);
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return ubi_num;
|
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|
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out_uif:
|
||||
|
@ -892,7 +1029,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
|
|||
out_free:
|
||||
vfree(ubi->peb_buf1);
|
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vfree(ubi->peb_buf2);
|
||||
#ifdef CONFIG_MTD_UBI_DEBUG
|
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#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
|
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vfree(ubi->dbg_peb_buf);
|
||||
#endif
|
||||
kfree(ubi);
|
||||
|
@ -919,13 +1056,13 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
|
|||
if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
|
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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);
|
||||
|
@ -939,12 +1076,14 @@ 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);
|
||||
|
||||
/*
|
||||
* 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);
|
||||
|
||||
|
@ -961,7 +1100,7 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
|
|||
put_mtd_device(ubi->mtd);
|
||||
vfree(ubi->peb_buf1);
|
||||
vfree(ubi->peb_buf2);
|
||||
#ifdef CONFIG_MTD_UBI_DEBUG
|
||||
#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
|
||||
vfree(ubi->dbg_peb_buf);
|
||||
#endif
|
||||
ubi_msg("mtd%d is detached from ubi%d", ubi->mtd->index, ubi->ubi_num);
|
||||
|
|
|
@ -113,7 +113,8 @@ static int vol_cdev_open(struct inode *inode, struct file *file)
|
|||
else
|
||||
mode = UBI_READONLY;
|
||||
|
||||
dbg_gen("open volume %d, mode %d", vol_id, mode);
|
||||
dbg_gen("open device %d, volume %d, mode %d",
|
||||
ubi_num, vol_id, mode);
|
||||
|
||||
desc = ubi_open_volume(ubi_num, vol_id, mode);
|
||||
if (IS_ERR(desc))
|
||||
|
@ -128,7 +129,8 @@ static int vol_cdev_release(struct inode *inode, struct file *file)
|
|||
struct ubi_volume_desc *desc = file->private_data;
|
||||
struct ubi_volume *vol = desc->vol;
|
||||
|
||||
dbg_gen("release volume %d, mode %d", vol->vol_id, desc->mode);
|
||||
dbg_gen("release device %d, volume %d, mode %d",
|
||||
vol->ubi->ubi_num, vol->vol_id, desc->mode);
|
||||
|
||||
if (vol->updating) {
|
||||
ubi_warn("update of volume %d not finished, volume is damaged",
|
||||
|
@ -393,7 +395,7 @@ static ssize_t vol_cdev_write(struct file *file, const char __user *buf,
|
|||
vol->corrupted = 1;
|
||||
}
|
||||
vol->checked = 1;
|
||||
ubi_gluebi_updated(vol);
|
||||
ubi_volume_notify(ubi, vol, UBI_VOLUME_UPDATED);
|
||||
revoke_exclusive(desc, UBI_READWRITE);
|
||||
}
|
||||
|
||||
|
@ -558,7 +560,7 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
|
|||
break;
|
||||
}
|
||||
|
||||
/* Set volume property command*/
|
||||
/* Set volume property command */
|
||||
case UBI_IOCSETPROP:
|
||||
{
|
||||
struct ubi_set_prop_req req;
|
||||
|
@ -571,9 +573,9 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
|
|||
}
|
||||
switch (req.property) {
|
||||
case UBI_PROP_DIRECT_WRITE:
|
||||
mutex_lock(&ubi->volumes_mutex);
|
||||
mutex_lock(&ubi->device_mutex);
|
||||
desc->vol->direct_writes = !!req.value;
|
||||
mutex_unlock(&ubi->volumes_mutex);
|
||||
mutex_unlock(&ubi->device_mutex);
|
||||
break;
|
||||
default:
|
||||
err = -EINVAL;
|
||||
|
@ -810,9 +812,9 @@ static int rename_volumes(struct ubi_device *ubi,
|
|||
re->desc->vol->vol_id, re->desc->vol->name);
|
||||
}
|
||||
|
||||
mutex_lock(&ubi->volumes_mutex);
|
||||
mutex_lock(&ubi->device_mutex);
|
||||
err = ubi_rename_volumes(ubi, &rename_list);
|
||||
mutex_unlock(&ubi->volumes_mutex);
|
||||
mutex_unlock(&ubi->device_mutex);
|
||||
|
||||
out_free:
|
||||
list_for_each_entry_safe(re, re1, &rename_list, list) {
|
||||
|
@ -856,9 +858,9 @@ static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
|
|||
if (err)
|
||||
break;
|
||||
|
||||
mutex_lock(&ubi->volumes_mutex);
|
||||
mutex_lock(&ubi->device_mutex);
|
||||
err = ubi_create_volume(ubi, &req);
|
||||
mutex_unlock(&ubi->volumes_mutex);
|
||||
mutex_unlock(&ubi->device_mutex);
|
||||
if (err)
|
||||
break;
|
||||
|
||||
|
@ -887,9 +889,9 @@ static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
|
|||
break;
|
||||
}
|
||||
|
||||
mutex_lock(&ubi->volumes_mutex);
|
||||
mutex_lock(&ubi->device_mutex);
|
||||
err = ubi_remove_volume(desc, 0);
|
||||
mutex_unlock(&ubi->volumes_mutex);
|
||||
mutex_unlock(&ubi->device_mutex);
|
||||
|
||||
/*
|
||||
* The volume is deleted (unless an error occurred), and the
|
||||
|
@ -926,9 +928,9 @@ static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
|
|||
pebs = div_u64(req.bytes + desc->vol->usable_leb_size - 1,
|
||||
desc->vol->usable_leb_size);
|
||||
|
||||
mutex_lock(&ubi->volumes_mutex);
|
||||
mutex_lock(&ubi->device_mutex);
|
||||
err = ubi_resize_volume(desc, pebs);
|
||||
mutex_unlock(&ubi->volumes_mutex);
|
||||
mutex_unlock(&ubi->device_mutex);
|
||||
ubi_close_volume(desc);
|
||||
break;
|
||||
}
|
||||
|
@ -952,9 +954,7 @@ static long ubi_cdev_ioctl(struct file *file, unsigned int cmd,
|
|||
break;
|
||||
}
|
||||
|
||||
mutex_lock(&ubi->mult_mutex);
|
||||
err = rename_volumes(ubi, req);
|
||||
mutex_unlock(&ubi->mult_mutex);
|
||||
kfree(req);
|
||||
break;
|
||||
}
|
||||
|
|
|
@ -419,8 +419,9 @@ int ubi_eba_read_leb(struct ubi_device *ubi, struct ubi_volume *vol, int lnum,
|
|||
* not implemented.
|
||||
*/
|
||||
if (err == UBI_IO_BAD_VID_HDR) {
|
||||
ubi_warn("bad VID header at PEB %d, LEB"
|
||||
"%d:%d", pnum, vol_id, lnum);
|
||||
ubi_warn("corrupted VID header at PEB "
|
||||
"%d, LEB %d:%d", pnum, vol_id,
|
||||
lnum);
|
||||
err = -EBADMSG;
|
||||
} else
|
||||
ubi_ro_mode(ubi);
|
||||
|
@ -939,6 +940,33 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
goto retry;
|
||||
}
|
||||
|
||||
/**
|
||||
* is_error_sane - check whether a read error is sane.
|
||||
* @err: code of the error happened during reading
|
||||
*
|
||||
* This is a helper function for 'ubi_eba_copy_leb()' which is called when we
|
||||
* cannot read data from the target PEB (an error @err happened). If the error
|
||||
* code is sane, then we treat this error as non-fatal. Otherwise the error is
|
||||
* fatal and UBI will be switched to R/O mode later.
|
||||
*
|
||||
* The idea is that we try not to switch to R/O mode if the read error is
|
||||
* something which suggests there was a real read problem. E.g., %-EIO. Or a
|
||||
* memory allocation failed (-%ENOMEM). Otherwise, it is safer to switch to R/O
|
||||
* mode, simply because we do not know what happened at the MTD level, and we
|
||||
* cannot handle this. E.g., the underlying driver may have become crazy, and
|
||||
* it is safer to switch to R/O mode to preserve the data.
|
||||
*
|
||||
* And bear in mind, this is about reading from the target PEB, i.e. the PEB
|
||||
* which we have just written.
|
||||
*/
|
||||
static int is_error_sane(int err)
|
||||
{
|
||||
if (err == -EIO || err == -ENOMEM || err == UBI_IO_BAD_VID_HDR ||
|
||||
err == -ETIMEDOUT)
|
||||
return 0;
|
||||
return 1;
|
||||
}
|
||||
|
||||
/**
|
||||
* ubi_eba_copy_leb - copy logical eraseblock.
|
||||
* @ubi: UBI device description object
|
||||
|
@ -950,12 +978,7 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
* physical eraseblock @to. The @vid_hdr buffer may be changed by this
|
||||
* function. Returns:
|
||||
* o %0 in case of success;
|
||||
* o %1 if the operation was canceled because the volume is being deleted
|
||||
* or because the PEB was put meanwhile;
|
||||
* o %2 if the operation was canceled because there was a write error to the
|
||||
* target PEB;
|
||||
* o %-EAGAIN if the operation was canceled because a bit-flip was detected
|
||||
* in the target PEB;
|
||||
* o %MOVE_CANCEL_RACE, %MOVE_TARGET_WR_ERR, %MOVE_CANCEL_BITFLIPS, etc;
|
||||
* o a negative error code in case of failure.
|
||||
*/
|
||||
int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
||||
|
@ -968,7 +991,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
vol_id = be32_to_cpu(vid_hdr->vol_id);
|
||||
lnum = be32_to_cpu(vid_hdr->lnum);
|
||||
|
||||
dbg_eba("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to);
|
||||
dbg_wl("copy LEB %d:%d, PEB %d to PEB %d", vol_id, lnum, from, to);
|
||||
|
||||
if (vid_hdr->vol_type == UBI_VID_STATIC) {
|
||||
data_size = be32_to_cpu(vid_hdr->data_size);
|
||||
|
@ -986,13 +1009,12 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
* be locked in 'ubi_wl_put_peb()' and wait for the WL worker to finish.
|
||||
*/
|
||||
vol = ubi->volumes[idx];
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
if (!vol) {
|
||||
/* No need to do further work, cancel */
|
||||
dbg_eba("volume %d is being removed, cancel", vol_id);
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
return 1;
|
||||
dbg_wl("volume %d is being removed, cancel", vol_id);
|
||||
return MOVE_CANCEL_RACE;
|
||||
}
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
|
||||
/*
|
||||
* We do not want anybody to write to this logical eraseblock while we
|
||||
|
@ -1004,12 +1026,13 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
* (@from). This task locks the LEB and goes sleep in the
|
||||
* 'ubi_wl_put_peb()' function on the @ubi->move_mutex. In turn, we are
|
||||
* holding @ubi->move_mutex and go sleep on the LEB lock. So, if the
|
||||
* LEB is already locked, we just do not move it and return %1.
|
||||
* LEB is already locked, we just do not move it and return
|
||||
* %MOVE_CANCEL_RACE, which means that UBI will re-try, but later.
|
||||
*/
|
||||
err = leb_write_trylock(ubi, vol_id, lnum);
|
||||
if (err) {
|
||||
dbg_eba("contention on LEB %d:%d, cancel", vol_id, lnum);
|
||||
return err;
|
||||
dbg_wl("contention on LEB %d:%d, cancel", vol_id, lnum);
|
||||
return MOVE_CANCEL_RACE;
|
||||
}
|
||||
|
||||
/*
|
||||
|
@ -1018,25 +1041,26 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
* cancel it.
|
||||
*/
|
||||
if (vol->eba_tbl[lnum] != from) {
|
||||
dbg_eba("LEB %d:%d is no longer mapped to PEB %d, mapped to "
|
||||
"PEB %d, cancel", vol_id, lnum, from,
|
||||
vol->eba_tbl[lnum]);
|
||||
err = 1;
|
||||
dbg_wl("LEB %d:%d is no longer mapped to PEB %d, mapped to "
|
||||
"PEB %d, cancel", vol_id, lnum, from,
|
||||
vol->eba_tbl[lnum]);
|
||||
err = MOVE_CANCEL_RACE;
|
||||
goto out_unlock_leb;
|
||||
}
|
||||
|
||||
/*
|
||||
* OK, now the LEB is locked and we can safely start moving it. Since
|
||||
* this function utilizes the @ubi->peb1_buf buffer which is shared
|
||||
* with some other functions, so lock the buffer by taking the
|
||||
* this function utilizes the @ubi->peb_buf1 buffer which is shared
|
||||
* with some other functions - we lock the buffer by taking the
|
||||
* @ubi->buf_mutex.
|
||||
*/
|
||||
mutex_lock(&ubi->buf_mutex);
|
||||
dbg_eba("read %d bytes of data", aldata_size);
|
||||
dbg_wl("read %d bytes of data", aldata_size);
|
||||
err = ubi_io_read_data(ubi, ubi->peb_buf1, from, 0, aldata_size);
|
||||
if (err && err != UBI_IO_BITFLIPS) {
|
||||
ubi_warn("error %d while reading data from PEB %d",
|
||||
err, from);
|
||||
err = MOVE_SOURCE_RD_ERR;
|
||||
goto out_unlock_buf;
|
||||
}
|
||||
|
||||
|
@ -1059,7 +1083,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
cond_resched();
|
||||
|
||||
/*
|
||||
* It may turn out to me that the whole @from physical eraseblock
|
||||
* It may turn out to be that the whole @from physical eraseblock
|
||||
* contains only 0xFF bytes. Then we have to only write the VID header
|
||||
* and do not write any data. This also means we should not set
|
||||
* @vid_hdr->copy_flag, @vid_hdr->data_size, and @vid_hdr->data_crc.
|
||||
|
@ -1074,7 +1098,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
err = ubi_io_write_vid_hdr(ubi, to, vid_hdr);
|
||||
if (err) {
|
||||
if (err == -EIO)
|
||||
err = 2;
|
||||
err = MOVE_TARGET_WR_ERR;
|
||||
goto out_unlock_buf;
|
||||
}
|
||||
|
||||
|
@ -1083,10 +1107,13 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
/* Read the VID header back and check if it was written correctly */
|
||||
err = ubi_io_read_vid_hdr(ubi, to, vid_hdr, 1);
|
||||
if (err) {
|
||||
if (err != UBI_IO_BITFLIPS)
|
||||
ubi_warn("cannot read VID header back from PEB %d", to);
|
||||
else
|
||||
err = -EAGAIN;
|
||||
if (err != UBI_IO_BITFLIPS) {
|
||||
ubi_warn("error %d while reading VID header back from "
|
||||
"PEB %d", err, to);
|
||||
if (is_error_sane(err))
|
||||
err = MOVE_TARGET_RD_ERR;
|
||||
} else
|
||||
err = MOVE_CANCEL_BITFLIPS;
|
||||
goto out_unlock_buf;
|
||||
}
|
||||
|
||||
|
@ -1094,7 +1121,7 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
err = ubi_io_write_data(ubi, ubi->peb_buf1, to, 0, aldata_size);
|
||||
if (err) {
|
||||
if (err == -EIO)
|
||||
err = 2;
|
||||
err = MOVE_TARGET_WR_ERR;
|
||||
goto out_unlock_buf;
|
||||
}
|
||||
|
||||
|
@ -1107,11 +1134,13 @@ int ubi_eba_copy_leb(struct ubi_device *ubi, int from, int to,
|
|||
|
||||
err = ubi_io_read_data(ubi, ubi->peb_buf2, to, 0, aldata_size);
|
||||
if (err) {
|
||||
if (err != UBI_IO_BITFLIPS)
|
||||
ubi_warn("cannot read data back from PEB %d",
|
||||
to);
|
||||
else
|
||||
err = -EAGAIN;
|
||||
if (err != UBI_IO_BITFLIPS) {
|
||||
ubi_warn("error %d while reading data back "
|
||||
"from PEB %d", err, to);
|
||||
if (is_error_sane(err))
|
||||
err = MOVE_TARGET_RD_ERR;
|
||||
} else
|
||||
err = MOVE_CANCEL_BITFLIPS;
|
||||
goto out_unlock_buf;
|
||||
}
|
||||
|
||||
|
|
|
@ -19,17 +19,71 @@
|
|||
*/
|
||||
|
||||
/*
|
||||
* This file includes implementation of fake MTD devices for each UBI volume.
|
||||
* This sounds strange, but it is in fact quite useful to make MTD-oriented
|
||||
* software (including all the legacy software) to work on top of UBI.
|
||||
* This is a small driver which implements fake MTD devices on top of UBI
|
||||
* volumes. This sounds strange, but it is in fact quite useful to make
|
||||
* MTD-oriented software (including all the legacy software) work on top of
|
||||
* UBI.
|
||||
*
|
||||
* Gluebi emulates MTD devices of "MTD_UBIVOLUME" type. Their minimal I/O unit
|
||||
* size (mtd->writesize) is equivalent to the UBI minimal I/O unit. The
|
||||
* size (@mtd->writesize) is equivalent to the UBI minimal I/O unit. The
|
||||
* eraseblock size is equivalent to the logical eraseblock size of the volume.
|
||||
*/
|
||||
|
||||
#include <linux/err.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/math64.h>
|
||||
#include "ubi.h"
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/mtd/ubi.h>
|
||||
#include <linux/mtd/mtd.h>
|
||||
#include "ubi-media.h"
|
||||
|
||||
#define err_msg(fmt, ...) \
|
||||
printk(KERN_DEBUG "gluebi (pid %d): %s: " fmt "\n", \
|
||||
current->pid, __func__, ##__VA_ARGS__)
|
||||
|
||||
/**
|
||||
* struct gluebi_device - a gluebi device description data structure.
|
||||
* @mtd: emulated MTD device description object
|
||||
* @refcnt: gluebi device reference count
|
||||
* @desc: UBI volume descriptor
|
||||
* @ubi_num: UBI device number this gluebi device works on
|
||||
* @vol_id: ID of UBI volume this gluebi device works on
|
||||
* @list: link in a list of gluebi devices
|
||||
*/
|
||||
struct gluebi_device {
|
||||
struct mtd_info mtd;
|
||||
int refcnt;
|
||||
struct ubi_volume_desc *desc;
|
||||
int ubi_num;
|
||||
int vol_id;
|
||||
struct list_head list;
|
||||
};
|
||||
|
||||
/* List of all gluebi devices */
|
||||
static LIST_HEAD(gluebi_devices);
|
||||
static DEFINE_MUTEX(devices_mutex);
|
||||
|
||||
/**
|
||||
* find_gluebi_nolock - find a gluebi device.
|
||||
* @ubi_num: UBI device number
|
||||
* @vol_id: volume ID
|
||||
*
|
||||
* This function seraches for gluebi device corresponding to UBI device
|
||||
* @ubi_num and UBI volume @vol_id. Returns the gluebi device description
|
||||
* object in case of success and %NULL in case of failure. The caller has to
|
||||
* have the &devices_mutex locked.
|
||||
*/
|
||||
static struct gluebi_device *find_gluebi_nolock(int ubi_num, int vol_id)
|
||||
{
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
list_for_each_entry(gluebi, &gluebi_devices, list)
|
||||
if (gluebi->ubi_num == ubi_num && gluebi->vol_id == vol_id)
|
||||
return gluebi;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
* gluebi_get_device - get MTD device reference.
|
||||
|
@ -41,15 +95,18 @@
|
|||
*/
|
||||
static int gluebi_get_device(struct mtd_info *mtd)
|
||||
{
|
||||
struct ubi_volume *vol;
|
||||
struct gluebi_device *gluebi;
|
||||
int ubi_mode = UBI_READONLY;
|
||||
|
||||
vol = container_of(mtd, struct ubi_volume, gluebi_mtd);
|
||||
if (!try_module_get(THIS_MODULE))
|
||||
return -ENODEV;
|
||||
|
||||
/*
|
||||
* We do not introduce locks for gluebi reference count because the
|
||||
* get_device()/put_device() calls are already serialized at MTD.
|
||||
*/
|
||||
if (vol->gluebi_refcount > 0) {
|
||||
if (mtd->flags & MTD_WRITEABLE)
|
||||
ubi_mode = UBI_READWRITE;
|
||||
|
||||
gluebi = container_of(mtd, struct gluebi_device, mtd);
|
||||
mutex_lock(&devices_mutex);
|
||||
if (gluebi->refcnt > 0) {
|
||||
/*
|
||||
* The MTD device is already referenced and this is just one
|
||||
* more reference. MTD allows many users to open the same
|
||||
|
@ -58,7 +115,8 @@ static int gluebi_get_device(struct mtd_info *mtd)
|
|||
* open the UBI volume again - just increase the reference
|
||||
* counter and return.
|
||||
*/
|
||||
vol->gluebi_refcount += 1;
|
||||
gluebi->refcnt += 1;
|
||||
mutex_unlock(&devices_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -66,11 +124,15 @@ static int gluebi_get_device(struct mtd_info *mtd)
|
|||
* This is the first reference to this UBI volume via the MTD device
|
||||
* interface. Open the corresponding volume in read-write mode.
|
||||
*/
|
||||
vol->gluebi_desc = ubi_open_volume(vol->ubi->ubi_num, vol->vol_id,
|
||||
UBI_READWRITE);
|
||||
if (IS_ERR(vol->gluebi_desc))
|
||||
return PTR_ERR(vol->gluebi_desc);
|
||||
vol->gluebi_refcount += 1;
|
||||
gluebi->desc = ubi_open_volume(gluebi->ubi_num, gluebi->vol_id,
|
||||
ubi_mode);
|
||||
if (IS_ERR(gluebi->desc)) {
|
||||
mutex_unlock(&devices_mutex);
|
||||
module_put(THIS_MODULE);
|
||||
return PTR_ERR(gluebi->desc);
|
||||
}
|
||||
gluebi->refcnt += 1;
|
||||
mutex_unlock(&devices_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
@ -83,13 +145,15 @@ static int gluebi_get_device(struct mtd_info *mtd)
|
|||
*/
|
||||
static void gluebi_put_device(struct mtd_info *mtd)
|
||||
{
|
||||
struct ubi_volume *vol;
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
vol = container_of(mtd, struct ubi_volume, gluebi_mtd);
|
||||
vol->gluebi_refcount -= 1;
|
||||
ubi_assert(vol->gluebi_refcount >= 0);
|
||||
if (vol->gluebi_refcount == 0)
|
||||
ubi_close_volume(vol->gluebi_desc);
|
||||
gluebi = container_of(mtd, struct gluebi_device, mtd);
|
||||
mutex_lock(&devices_mutex);
|
||||
gluebi->refcnt -= 1;
|
||||
if (gluebi->refcnt == 0)
|
||||
ubi_close_volume(gluebi->desc);
|
||||
module_put(THIS_MODULE);
|
||||
mutex_unlock(&devices_mutex);
|
||||
}
|
||||
|
||||
/**
|
||||
|
@ -107,16 +171,12 @@ static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len,
|
|||
size_t *retlen, unsigned char *buf)
|
||||
{
|
||||
int err = 0, lnum, offs, total_read;
|
||||
struct ubi_volume *vol;
|
||||
struct ubi_device *ubi;
|
||||
|
||||
dbg_gen("read %zd bytes from offset %lld", len, from);
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
if (len < 0 || from < 0 || from + len > mtd->size)
|
||||
return -EINVAL;
|
||||
|
||||
vol = container_of(mtd, struct ubi_volume, gluebi_mtd);
|
||||
ubi = vol->ubi;
|
||||
gluebi = container_of(mtd, struct gluebi_device, mtd);
|
||||
|
||||
lnum = div_u64_rem(from, mtd->erasesize, &offs);
|
||||
total_read = len;
|
||||
|
@ -126,7 +186,7 @@ static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len,
|
|||
if (to_read > total_read)
|
||||
to_read = total_read;
|
||||
|
||||
err = ubi_eba_read_leb(ubi, vol, lnum, buf, offs, to_read, 0);
|
||||
err = ubi_read(gluebi->desc, lnum, buf, offs, to_read);
|
||||
if (err)
|
||||
break;
|
||||
|
||||
|
@ -152,21 +212,17 @@ static int gluebi_read(struct mtd_info *mtd, loff_t from, size_t len,
|
|||
* case of failure.
|
||||
*/
|
||||
static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len,
|
||||
size_t *retlen, const u_char *buf)
|
||||
size_t *retlen, const u_char *buf)
|
||||
{
|
||||
int err = 0, lnum, offs, total_written;
|
||||
struct ubi_volume *vol;
|
||||
struct ubi_device *ubi;
|
||||
|
||||
dbg_gen("write %zd bytes to offset %lld", len, to);
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
if (len < 0 || to < 0 || len + to > mtd->size)
|
||||
return -EINVAL;
|
||||
|
||||
vol = container_of(mtd, struct ubi_volume, gluebi_mtd);
|
||||
ubi = vol->ubi;
|
||||
gluebi = container_of(mtd, struct gluebi_device, mtd);
|
||||
|
||||
if (ubi->ro_mode)
|
||||
if (!(mtd->flags & MTD_WRITEABLE))
|
||||
return -EROFS;
|
||||
|
||||
lnum = div_u64_rem(to, mtd->erasesize, &offs);
|
||||
|
@ -181,8 +237,7 @@ static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len,
|
|||
if (to_write > total_written)
|
||||
to_write = total_written;
|
||||
|
||||
err = ubi_eba_write_leb(ubi, vol, lnum, buf, offs, to_write,
|
||||
UBI_UNKNOWN);
|
||||
err = ubi_write(gluebi->desc, lnum, buf, offs, to_write);
|
||||
if (err)
|
||||
break;
|
||||
|
||||
|
@ -207,41 +262,36 @@ static int gluebi_write(struct mtd_info *mtd, loff_t to, size_t len,
|
|||
static int gluebi_erase(struct mtd_info *mtd, struct erase_info *instr)
|
||||
{
|
||||
int err, i, lnum, count;
|
||||
struct ubi_volume *vol;
|
||||
struct ubi_device *ubi;
|
||||
|
||||
dbg_gen("erase %llu bytes at offset %llu", (unsigned long long)instr->len,
|
||||
(unsigned long long)instr->addr);
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
if (instr->addr < 0 || instr->addr > mtd->size - mtd->erasesize)
|
||||
return -EINVAL;
|
||||
|
||||
if (instr->len < 0 || instr->addr + instr->len > mtd->size)
|
||||
return -EINVAL;
|
||||
|
||||
if (mtd_mod_by_ws(instr->addr, mtd) || mtd_mod_by_ws(instr->len, mtd))
|
||||
return -EINVAL;
|
||||
|
||||
lnum = mtd_div_by_eb(instr->addr, mtd);
|
||||
count = mtd_div_by_eb(instr->len, mtd);
|
||||
|
||||
vol = container_of(mtd, struct ubi_volume, gluebi_mtd);
|
||||
ubi = vol->ubi;
|
||||
gluebi = container_of(mtd, struct gluebi_device, mtd);
|
||||
|
||||
if (ubi->ro_mode)
|
||||
if (!(mtd->flags & MTD_WRITEABLE))
|
||||
return -EROFS;
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
err = ubi_eba_unmap_leb(ubi, vol, lnum + i);
|
||||
for (i = 0; i < count - 1; i++) {
|
||||
err = ubi_leb_unmap(gluebi->desc, lnum + i);
|
||||
if (err)
|
||||
goto out_err;
|
||||
}
|
||||
|
||||
/*
|
||||
* MTD erase operations are synchronous, so we have to make sure the
|
||||
* physical eraseblock is wiped out.
|
||||
*
|
||||
* Thus, perform leb_erase instead of leb_unmap operation - leb_erase
|
||||
* will wait for the end of operations
|
||||
*/
|
||||
err = ubi_wl_flush(ubi);
|
||||
err = ubi_leb_erase(gluebi->desc, lnum + i);
|
||||
if (err)
|
||||
goto out_err;
|
||||
|
||||
|
@ -256,28 +306,38 @@ static int gluebi_erase(struct mtd_info *mtd, struct erase_info *instr)
|
|||
}
|
||||
|
||||
/**
|
||||
* ubi_create_gluebi - initialize gluebi for an UBI volume.
|
||||
* @ubi: UBI device description object
|
||||
* @vol: volume description object
|
||||
* gluebi_create - create a gluebi device for an UBI volume.
|
||||
* @di: UBI device description object
|
||||
* @vi: UBI volume description object
|
||||
*
|
||||
* This function is called when an UBI volume is created in order to create
|
||||
* This function is called when a new UBI volume is created in order to create
|
||||
* corresponding fake MTD device. Returns zero in case of success and a
|
||||
* negative error code in case of failure.
|
||||
*/
|
||||
int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol)
|
||||
static int gluebi_create(struct ubi_device_info *di,
|
||||
struct ubi_volume_info *vi)
|
||||
{
|
||||
struct mtd_info *mtd = &vol->gluebi_mtd;
|
||||
struct gluebi_device *gluebi, *g;
|
||||
struct mtd_info *mtd;
|
||||
|
||||
mtd->name = kmemdup(vol->name, vol->name_len + 1, GFP_KERNEL);
|
||||
if (!mtd->name)
|
||||
gluebi = kzalloc(sizeof(struct gluebi_device), GFP_KERNEL);
|
||||
if (!gluebi)
|
||||
return -ENOMEM;
|
||||
|
||||
mtd = &gluebi->mtd;
|
||||
mtd->name = kmemdup(vi->name, vi->name_len + 1, GFP_KERNEL);
|
||||
if (!mtd->name) {
|
||||
kfree(gluebi);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
gluebi->vol_id = vi->vol_id;
|
||||
mtd->type = MTD_UBIVOLUME;
|
||||
if (!ubi->ro_mode)
|
||||
if (!di->ro_mode)
|
||||
mtd->flags = MTD_WRITEABLE;
|
||||
mtd->writesize = ubi->min_io_size;
|
||||
mtd->owner = THIS_MODULE;
|
||||
mtd->erasesize = vol->usable_leb_size;
|
||||
mtd->writesize = di->min_io_size;
|
||||
mtd->erasesize = vi->usable_leb_size;
|
||||
mtd->read = gluebi_read;
|
||||
mtd->write = gluebi_write;
|
||||
mtd->erase = gluebi_erase;
|
||||
|
@ -285,60 +345,196 @@ int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol)
|
|||
mtd->put_device = gluebi_put_device;
|
||||
|
||||
/*
|
||||
* In case of dynamic volume, MTD device size is just volume size. In
|
||||
* In case of dynamic a volume, MTD device size is just volume size. In
|
||||
* case of a static volume the size is equivalent to the amount of data
|
||||
* bytes.
|
||||
*/
|
||||
if (vol->vol_type == UBI_DYNAMIC_VOLUME)
|
||||
mtd->size = (long long)vol->usable_leb_size * vol->reserved_pebs;
|
||||
if (vi->vol_type == UBI_DYNAMIC_VOLUME)
|
||||
mtd->size = (unsigned long long)vi->usable_leb_size * vi->size;
|
||||
else
|
||||
mtd->size = vol->used_bytes;
|
||||
mtd->size = vi->used_bytes;
|
||||
|
||||
/* Just a sanity check - make sure this gluebi device does not exist */
|
||||
mutex_lock(&devices_mutex);
|
||||
g = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
|
||||
if (g)
|
||||
err_msg("gluebi MTD device %d form UBI device %d volume %d "
|
||||
"already exists", g->mtd.index, vi->ubi_num,
|
||||
vi->vol_id);
|
||||
mutex_unlock(&devices_mutex);
|
||||
|
||||
if (add_mtd_device(mtd)) {
|
||||
ubi_err("cannot not add MTD device");
|
||||
err_msg("cannot add MTD device");
|
||||
kfree(mtd->name);
|
||||
kfree(gluebi);
|
||||
return -ENFILE;
|
||||
}
|
||||
|
||||
dbg_gen("added mtd%d (\"%s\"), size %llu, EB size %u",
|
||||
mtd->index, mtd->name, (unsigned long long)mtd->size, mtd->erasesize);
|
||||
mutex_lock(&devices_mutex);
|
||||
list_add_tail(&gluebi->list, &gluebi_devices);
|
||||
mutex_unlock(&devices_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* ubi_destroy_gluebi - close gluebi for an UBI volume.
|
||||
* @vol: volume description object
|
||||
* gluebi_remove - remove a gluebi device.
|
||||
* @vi: UBI volume description object
|
||||
*
|
||||
* This function is called when an UBI volume is removed in order to remove
|
||||
* This function is called when an UBI volume is removed and it removes
|
||||
* corresponding fake MTD device. Returns zero in case of success and a
|
||||
* negative error code in case of failure.
|
||||
*/
|
||||
int ubi_destroy_gluebi(struct ubi_volume *vol)
|
||||
static int gluebi_remove(struct ubi_volume_info *vi)
|
||||
{
|
||||
int err;
|
||||
struct mtd_info *mtd = &vol->gluebi_mtd;
|
||||
int err = 0;
|
||||
struct mtd_info *mtd;
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
dbg_gen("remove mtd%d", mtd->index);
|
||||
err = del_mtd_device(mtd);
|
||||
mutex_lock(&devices_mutex);
|
||||
gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
|
||||
if (!gluebi) {
|
||||
err_msg("got remove notification for unknown UBI device %d "
|
||||
"volume %d", vi->ubi_num, vi->vol_id);
|
||||
err = -ENOENT;
|
||||
} else if (gluebi->refcnt)
|
||||
err = -EBUSY;
|
||||
else
|
||||
list_del(&gluebi->list);
|
||||
mutex_unlock(&devices_mutex);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
mtd = &gluebi->mtd;
|
||||
err = del_mtd_device(mtd);
|
||||
if (err) {
|
||||
err_msg("cannot remove fake MTD device %d, UBI device %d, "
|
||||
"volume %d, error %d", mtd->index, gluebi->ubi_num,
|
||||
gluebi->vol_id, err);
|
||||
mutex_lock(&devices_mutex);
|
||||
list_add_tail(&gluebi->list, &gluebi_devices);
|
||||
mutex_unlock(&devices_mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
kfree(mtd->name);
|
||||
kfree(gluebi);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* ubi_gluebi_updated - UBI volume was updated notifier.
|
||||
* @vol: volume description object
|
||||
* gluebi_updated - UBI volume was updated notifier.
|
||||
* @vi: volume info structure
|
||||
*
|
||||
* This function is called every time an UBI volume is updated. This function
|
||||
* does nothing if volume @vol is dynamic, and changes MTD device size if the
|
||||
* This function is called every time an UBI volume is updated. It does nothing
|
||||
* if te volume @vol is dynamic, and changes MTD device size if the
|
||||
* volume is static. This is needed because static volumes cannot be read past
|
||||
* data they contain.
|
||||
* data they contain. This function returns zero in case of success and a
|
||||
* negative error code in case of error.
|
||||
*/
|
||||
void ubi_gluebi_updated(struct ubi_volume *vol)
|
||||
static int gluebi_updated(struct ubi_volume_info *vi)
|
||||
{
|
||||
struct mtd_info *mtd = &vol->gluebi_mtd;
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
if (vol->vol_type == UBI_STATIC_VOLUME)
|
||||
mtd->size = vol->used_bytes;
|
||||
mutex_lock(&devices_mutex);
|
||||
gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
|
||||
if (!gluebi) {
|
||||
mutex_unlock(&devices_mutex);
|
||||
err_msg("got update notification for unknown UBI device %d "
|
||||
"volume %d", vi->ubi_num, vi->vol_id);
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
if (vi->vol_type == UBI_STATIC_VOLUME)
|
||||
gluebi->mtd.size = vi->used_bytes;
|
||||
mutex_unlock(&devices_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* gluebi_resized - UBI volume was re-sized notifier.
|
||||
* @vi: volume info structure
|
||||
*
|
||||
* This function is called every time an UBI volume is re-size. It changes the
|
||||
* corresponding fake MTD device size. This function returns zero in case of
|
||||
* success and a negative error code in case of error.
|
||||
*/
|
||||
static int gluebi_resized(struct ubi_volume_info *vi)
|
||||
{
|
||||
struct gluebi_device *gluebi;
|
||||
|
||||
mutex_lock(&devices_mutex);
|
||||
gluebi = find_gluebi_nolock(vi->ubi_num, vi->vol_id);
|
||||
if (!gluebi) {
|
||||
mutex_unlock(&devices_mutex);
|
||||
err_msg("got update notification for unknown UBI device %d "
|
||||
"volume %d", vi->ubi_num, vi->vol_id);
|
||||
return -ENOENT;
|
||||
}
|
||||
gluebi->mtd.size = vi->used_bytes;
|
||||
mutex_unlock(&devices_mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* gluebi_notify - UBI notification handler.
|
||||
* @nb: registered notifier block
|
||||
* @l: notification type
|
||||
* @ptr: pointer to the &struct ubi_notification object
|
||||
*/
|
||||
static int gluebi_notify(struct notifier_block *nb, unsigned long l,
|
||||
void *ns_ptr)
|
||||
{
|
||||
struct ubi_notification *nt = ns_ptr;
|
||||
|
||||
switch (l) {
|
||||
case UBI_VOLUME_ADDED:
|
||||
gluebi_create(&nt->di, &nt->vi);
|
||||
break;
|
||||
case UBI_VOLUME_REMOVED:
|
||||
gluebi_remove(&nt->vi);
|
||||
break;
|
||||
case UBI_VOLUME_RESIZED:
|
||||
gluebi_resized(&nt->vi);
|
||||
break;
|
||||
case UBI_VOLUME_UPDATED:
|
||||
gluebi_updated(&nt->vi);
|
||||
break;
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return NOTIFY_OK;
|
||||
}
|
||||
|
||||
static struct notifier_block gluebi_notifier = {
|
||||
.notifier_call = gluebi_notify,
|
||||
};
|
||||
|
||||
static int __init ubi_gluebi_init(void)
|
||||
{
|
||||
return ubi_register_volume_notifier(&gluebi_notifier, 0);
|
||||
}
|
||||
|
||||
static void __exit ubi_gluebi_exit(void)
|
||||
{
|
||||
struct gluebi_device *gluebi, *g;
|
||||
|
||||
list_for_each_entry_safe(gluebi, g, &gluebi_devices, list) {
|
||||
int err;
|
||||
struct mtd_info *mtd = &gluebi->mtd;
|
||||
|
||||
err = del_mtd_device(mtd);
|
||||
if (err)
|
||||
err_msg("error %d while removing gluebi MTD device %d, "
|
||||
"UBI device %d, volume %d - ignoring", err,
|
||||
mtd->index, gluebi->ubi_num, gluebi->vol_id);
|
||||
kfree(mtd->name);
|
||||
kfree(gluebi);
|
||||
}
|
||||
ubi_unregister_volume_notifier(&gluebi_notifier);
|
||||
}
|
||||
|
||||
module_init(ubi_gluebi_init);
|
||||
module_exit(ubi_gluebi_exit);
|
||||
MODULE_DESCRIPTION("MTD emulation layer over UBI volumes");
|
||||
MODULE_AUTHOR("Artem Bityutskiy, Joern Engel");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
|
|
@ -100,6 +100,7 @@ static int paranoid_check_vid_hdr(const struct ubi_device *ubi, int pnum,
|
|||
const struct ubi_vid_hdr *vid_hdr);
|
||||
static int paranoid_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
|
||||
int len);
|
||||
static int paranoid_check_empty(struct ubi_device *ubi, int pnum);
|
||||
#else
|
||||
#define paranoid_check_not_bad(ubi, pnum) 0
|
||||
#define paranoid_check_peb_ec_hdr(ubi, pnum) 0
|
||||
|
@ -107,6 +108,7 @@ static int paranoid_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
|
|||
#define paranoid_check_peb_vid_hdr(ubi, pnum) 0
|
||||
#define paranoid_check_vid_hdr(ubi, pnum, vid_hdr) 0
|
||||
#define paranoid_check_all_ff(ubi, pnum, offset, len) 0
|
||||
#define paranoid_check_empty(ubi, pnum) 0
|
||||
#endif
|
||||
|
||||
/**
|
||||
|
@ -670,11 +672,6 @@ int ubi_io_read_ec_hdr(struct ubi_device *ubi, int pnum,
|
|||
if (read_err != -EBADMSG &&
|
||||
check_pattern(ec_hdr, 0xFF, UBI_EC_HDR_SIZE)) {
|
||||
/* The physical eraseblock is supposedly empty */
|
||||
|
||||
/*
|
||||
* The below is just a paranoid check, it has to be
|
||||
* compiled out if paranoid checks are disabled.
|
||||
*/
|
||||
err = paranoid_check_all_ff(ubi, pnum, 0,
|
||||
ubi->peb_size);
|
||||
if (err)
|
||||
|
@ -902,7 +899,7 @@ static int validate_vid_hdr(const struct ubi_device *ubi,
|
|||
* o %UBI_IO_BITFLIPS if the CRC is correct, but bit-flips were detected
|
||||
* and corrected by the flash driver; this is harmless but may indicate that
|
||||
* this eraseblock may become bad soon;
|
||||
* o %UBI_IO_BAD_VID_HRD if the volume identifier header is corrupted (a CRC
|
||||
* o %UBI_IO_BAD_VID_HDR if the volume identifier header is corrupted (a CRC
|
||||
* error detected);
|
||||
* o %UBI_IO_PEB_FREE if the physical eraseblock is free (i.e., there is no VID
|
||||
* header there);
|
||||
|
@ -955,8 +952,7 @@ int ubi_io_read_vid_hdr(struct ubi_device *ubi, int pnum,
|
|||
* The below is just a paranoid check, it has to be
|
||||
* compiled out if paranoid checks are disabled.
|
||||
*/
|
||||
err = paranoid_check_all_ff(ubi, pnum, ubi->leb_start,
|
||||
ubi->leb_size);
|
||||
err = paranoid_check_empty(ubi, pnum);
|
||||
if (err)
|
||||
return err > 0 ? UBI_IO_BAD_VID_HDR : err;
|
||||
|
||||
|
@ -1280,4 +1276,74 @@ static int paranoid_check_all_ff(struct ubi_device *ubi, int pnum, int offset,
|
|||
return err;
|
||||
}
|
||||
|
||||
/**
|
||||
* paranoid_check_empty - whether a PEB is empty.
|
||||
* @ubi: UBI device description object
|
||||
* @pnum: the physical eraseblock number to check
|
||||
*
|
||||
* This function makes sure PEB @pnum is empty, which means it contains only
|
||||
* %0xFF data bytes. Returns zero if the PEB is empty, %1 if not, and a
|
||||
* negative error code in case of failure.
|
||||
*
|
||||
* Empty PEBs have the EC header, and do not have the VID header. The caller of
|
||||
* this function should have already made sure the PEB does not have the VID
|
||||
* header. However, this function re-checks that, because it is possible that
|
||||
* the header and data has already been written to the PEB.
|
||||
*
|
||||
* Let's consider a possible scenario. Suppose there are 2 tasks - A and B.
|
||||
* Task A is in 'wear_leveling_worker()'. It is reading VID header of PEB X to
|
||||
* find which LEB it corresponds to. PEB X is currently unmapped, and has no
|
||||
* VID header. Task B is trying to write to PEB X.
|
||||
*
|
||||
* Task A: in 'ubi_io_read_vid_hdr()': reads the VID header from PEB X. The
|
||||
* read data contain all 0xFF bytes;
|
||||
* Task B: writes VID header and some data to PEB X;
|
||||
* Task A: assumes PEB X is empty, calls 'paranoid_check_empty()'. And if we
|
||||
* do not re-read the VID header, and do not cancel the checking if it
|
||||
* is there, we fail.
|
||||
*/
|
||||
static int paranoid_check_empty(struct ubi_device *ubi, int pnum)
|
||||
{
|
||||
int err, offs = ubi->vid_hdr_aloffset, len = ubi->vid_hdr_alsize;
|
||||
size_t read;
|
||||
uint32_t magic;
|
||||
const struct ubi_vid_hdr *vid_hdr;
|
||||
|
||||
mutex_lock(&ubi->dbg_buf_mutex);
|
||||
err = ubi->mtd->read(ubi->mtd, offs, len, &read, ubi->dbg_peb_buf);
|
||||
if (err && err != -EUCLEAN) {
|
||||
ubi_err("error %d while reading %d bytes from PEB %d:%d, "
|
||||
"read %zd bytes", err, len, pnum, offs, read);
|
||||
goto error;
|
||||
}
|
||||
|
||||
vid_hdr = ubi->dbg_peb_buf;
|
||||
magic = be32_to_cpu(vid_hdr->magic);
|
||||
if (magic == UBI_VID_HDR_MAGIC)
|
||||
/* The PEB contains VID header, so it is not empty */
|
||||
goto out;
|
||||
|
||||
err = check_pattern(ubi->dbg_peb_buf, 0xFF, len);
|
||||
if (err == 0) {
|
||||
ubi_err("flash region at PEB %d:%d, length %d does not "
|
||||
"contain all 0xFF bytes", pnum, offs, len);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
out:
|
||||
mutex_unlock(&ubi->dbg_buf_mutex);
|
||||
return 0;
|
||||
|
||||
fail:
|
||||
ubi_err("paranoid check failed for PEB %d", pnum);
|
||||
ubi_msg("hex dump of the %d-%d region", offs, offs + len);
|
||||
print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
|
||||
ubi->dbg_peb_buf, len, 1);
|
||||
err = 1;
|
||||
error:
|
||||
ubi_dbg_dump_stack();
|
||||
mutex_unlock(&ubi->dbg_buf_mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
#endif /* CONFIG_MTD_UBI_DEBUG_PARANOID */
|
||||
|
|
|
@ -25,6 +25,24 @@
|
|||
#include <asm/div64.h>
|
||||
#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
|
||||
|
@ -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);
|
||||
|
||||
/**
|
||||
|
@ -106,7 +126,7 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
|
|||
struct ubi_device *ubi;
|
||||
struct ubi_volume *vol;
|
||||
|
||||
dbg_gen("open device %d volume %d, mode %d", ubi_num, vol_id, mode);
|
||||
dbg_gen("open device %d, volume %d, mode %d", ubi_num, vol_id, mode);
|
||||
|
||||
if (ubi_num < 0 || ubi_num >= UBI_MAX_DEVICES)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
@ -196,6 +216,8 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
|
|||
kfree(desc);
|
||||
out_put_ubi:
|
||||
ubi_put_device(ubi);
|
||||
dbg_err("cannot open device %d, volume %d, error %d",
|
||||
ubi_num, vol_id, err);
|
||||
return ERR_PTR(err);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(ubi_open_volume);
|
||||
|
@ -215,7 +237,7 @@ struct ubi_volume_desc *ubi_open_volume_nm(int ubi_num, const char *name,
|
|||
struct ubi_device *ubi;
|
||||
struct ubi_volume_desc *ret;
|
||||
|
||||
dbg_gen("open volume %s, mode %d", name, mode);
|
||||
dbg_gen("open device %d, volume %s, mode %d", ubi_num, name, mode);
|
||||
|
||||
if (!name)
|
||||
return ERR_PTR(-EINVAL);
|
||||
|
@ -266,7 +288,8 @@ void ubi_close_volume(struct ubi_volume_desc *desc)
|
|||
struct ubi_volume *vol = desc->vol;
|
||||
struct ubi_device *ubi = vol->ubi;
|
||||
|
||||
dbg_gen("close volume %d, mode %d", vol->vol_id, desc->mode);
|
||||
dbg_gen("close device %d, volume %d, mode %d",
|
||||
ubi->ubi_num, vol->vol_id, desc->mode);
|
||||
|
||||
spin_lock(&ubi->volumes_lock);
|
||||
switch (desc->mode) {
|
||||
|
@ -558,7 +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
|
||||
|
@ -656,3 +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);
|
||||
|
|
|
@ -36,6 +36,7 @@
|
|||
#include <linux/device.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/vmalloc.h>
|
||||
#include <linux/notifier.h>
|
||||
#include <linux/mtd/mtd.h>
|
||||
#include <linux/mtd/ubi.h>
|
||||
|
||||
|
@ -100,6 +101,28 @@ enum {
|
|||
UBI_IO_BITFLIPS
|
||||
};
|
||||
|
||||
/*
|
||||
* Return codes of the 'ubi_eba_copy_leb()' function.
|
||||
*
|
||||
* MOVE_CANCEL_RACE: canceled because the volume is being deleted, the source
|
||||
* PEB was put meanwhile, or there is I/O on the source PEB
|
||||
* MOVE_SOURCE_RD_ERR: canceled because there was a read error from the source
|
||||
* PEB
|
||||
* MOVE_TARGET_RD_ERR: canceled because there was a read error from the target
|
||||
* PEB
|
||||
* MOVE_TARGET_WR_ERR: canceled because there was a write error to the target
|
||||
* PEB
|
||||
* MOVE_CANCEL_BITFLIPS: canceled because a bit-flip was detected in the
|
||||
* target PEB
|
||||
*/
|
||||
enum {
|
||||
MOVE_CANCEL_RACE = 1,
|
||||
MOVE_SOURCE_RD_ERR,
|
||||
MOVE_TARGET_RD_ERR,
|
||||
MOVE_TARGET_WR_ERR,
|
||||
MOVE_CANCEL_BITFLIPS,
|
||||
};
|
||||
|
||||
/**
|
||||
* struct ubi_wl_entry - wear-leveling entry.
|
||||
* @u.rb: link in the corresponding (free/used) RB-tree
|
||||
|
@ -208,10 +231,6 @@ struct ubi_volume_desc;
|
|||
* @changing_leb: %1 if the atomic LEB change ioctl command is in progress
|
||||
* @direct_writes: %1 if direct writes are enabled for this volume
|
||||
*
|
||||
* @gluebi_desc: gluebi UBI volume descriptor
|
||||
* @gluebi_refcount: reference count of the gluebi MTD device
|
||||
* @gluebi_mtd: MTD device description object of the gluebi MTD device
|
||||
*
|
||||
* The @corrupted field indicates that the volume's contents is corrupted.
|
||||
* Since UBI protects only static volumes, this field is not relevant to
|
||||
* dynamic volumes - it is user's responsibility to assure their data
|
||||
|
@ -255,17 +274,6 @@ struct ubi_volume {
|
|||
unsigned int updating:1;
|
||||
unsigned int changing_leb:1;
|
||||
unsigned int direct_writes:1;
|
||||
|
||||
#ifdef CONFIG_MTD_UBI_GLUEBI
|
||||
/*
|
||||
* Gluebi-related stuff may be compiled out.
|
||||
* Note: this should not be built into UBI but should be a separate
|
||||
* ubimtd driver which works on top of UBI and emulates MTD devices.
|
||||
*/
|
||||
struct ubi_volume_desc *gluebi_desc;
|
||||
int gluebi_refcount;
|
||||
struct mtd_info gluebi_mtd;
|
||||
#endif
|
||||
};
|
||||
|
||||
/**
|
||||
|
@ -305,9 +313,9 @@ struct ubi_wl_entry;
|
|||
* @vtbl_slots: how many slots are available in the volume table
|
||||
* @vtbl_size: size of the volume table in bytes
|
||||
* @vtbl: in-RAM volume table copy
|
||||
* @volumes_mutex: protects on-flash volume table and serializes volume
|
||||
* changes, like creation, deletion, update, re-size,
|
||||
* re-name and set property
|
||||
* @device_mutex: protects on-flash volume table and serializes volume
|
||||
* creation, deletion, update, re-size, re-name and set
|
||||
* property
|
||||
*
|
||||
* @max_ec: current highest erase counter value
|
||||
* @mean_ec: current mean erase counter value
|
||||
|
@ -318,14 +326,15 @@ struct ubi_wl_entry;
|
|||
* @alc_mutex: serializes "atomic LEB change" operations
|
||||
*
|
||||
* @used: RB-tree of used physical eraseblocks
|
||||
* @erroneous: RB-tree of erroneous used physical eraseblocks
|
||||
* @free: RB-tree of free physical eraseblocks
|
||||
* @scrub: RB-tree of physical eraseblocks which need scrubbing
|
||||
* @pq: protection queue (contain physical eraseblocks which are temporarily
|
||||
* protected from the wear-leveling worker)
|
||||
* @pq_head: protection queue head
|
||||
* @wl_lock: protects the @used, @free, @pq, @pq_head, @lookuptbl, @move_from,
|
||||
* @move_to, @move_to_put @erase_pending, @wl_scheduled and @works
|
||||
* fields
|
||||
* @move_to, @move_to_put @erase_pending, @wl_scheduled, @works,
|
||||
* @erroneous, and @erroneous_peb_count fields
|
||||
* @move_mutex: serializes eraseblock moves
|
||||
* @work_sem: synchronizes the WL worker with use tasks
|
||||
* @wl_scheduled: non-zero if the wear-leveling was scheduled
|
||||
|
@ -339,12 +348,15 @@ struct ubi_wl_entry;
|
|||
* @bgt_thread: background thread description object
|
||||
* @thread_enabled: if the background thread is enabled
|
||||
* @bgt_name: background thread name
|
||||
* @reboot_notifier: notifier to terminate background thread before rebooting
|
||||
*
|
||||
* @flash_size: underlying MTD device size (in bytes)
|
||||
* @peb_count: count of physical eraseblocks on the MTD device
|
||||
* @peb_size: physical eraseblock size
|
||||
* @bad_peb_count: count of bad physical eraseblocks
|
||||
* @good_peb_count: count of good physical eraseblocks
|
||||
* @erroneous_peb_count: count of erroneous physical eraseblocks in @erroneous
|
||||
* @max_erroneous: maximum allowed amount of erroneous physical eraseblocks
|
||||
* @min_io_size: minimal input/output unit size of the underlying MTD device
|
||||
* @hdrs_min_io_size: minimal I/O unit size used for VID and EC headers
|
||||
* @ro_mode: if the UBI device is in read-only mode
|
||||
|
@ -366,7 +378,6 @@ struct ubi_wl_entry;
|
|||
* @peb_buf2: another buffer of PEB size used for different purposes
|
||||
* @buf_mutex: protects @peb_buf1 and @peb_buf2
|
||||
* @ckvol_mutex: serializes static volume checking when opening
|
||||
* @mult_mutex: serializes operations on multiple volumes, like re-naming
|
||||
* @dbg_peb_buf: buffer of PEB size used for debugging
|
||||
* @dbg_buf_mutex: protects @dbg_peb_buf
|
||||
*/
|
||||
|
@ -389,7 +400,7 @@ struct ubi_device {
|
|||
int vtbl_slots;
|
||||
int vtbl_size;
|
||||
struct ubi_vtbl_record *vtbl;
|
||||
struct mutex volumes_mutex;
|
||||
struct mutex device_mutex;
|
||||
|
||||
int max_ec;
|
||||
/* Note, mean_ec is not updated run-time - should be fixed */
|
||||
|
@ -403,6 +414,7 @@ struct ubi_device {
|
|||
|
||||
/* Wear-leveling sub-system's stuff */
|
||||
struct rb_root used;
|
||||
struct rb_root erroneous;
|
||||
struct rb_root free;
|
||||
struct rb_root scrub;
|
||||
struct list_head pq[UBI_PROT_QUEUE_LEN];
|
||||
|
@ -420,6 +432,7 @@ struct ubi_device {
|
|||
struct task_struct *bgt_thread;
|
||||
int thread_enabled;
|
||||
char bgt_name[sizeof(UBI_BGT_NAME_PATTERN)+2];
|
||||
struct notifier_block reboot_notifier;
|
||||
|
||||
/* I/O sub-system's stuff */
|
||||
long long flash_size;
|
||||
|
@ -427,6 +440,8 @@ struct ubi_device {
|
|||
int peb_size;
|
||||
int bad_peb_count;
|
||||
int good_peb_count;
|
||||
int erroneous_peb_count;
|
||||
int max_erroneous;
|
||||
int min_io_size;
|
||||
int hdrs_min_io_size;
|
||||
int ro_mode;
|
||||
|
@ -444,8 +459,7 @@ struct ubi_device {
|
|||
void *peb_buf2;
|
||||
struct mutex buf_mutex;
|
||||
struct mutex ckvol_mutex;
|
||||
struct mutex mult_mutex;
|
||||
#ifdef CONFIG_MTD_UBI_DEBUG
|
||||
#ifdef CONFIG_MTD_UBI_DEBUG_PARANOID
|
||||
void *dbg_peb_buf;
|
||||
struct mutex dbg_buf_mutex;
|
||||
#endif
|
||||
|
@ -457,6 +471,7 @@ 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,
|
||||
|
@ -489,17 +504,6 @@ int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
|
|||
int ubi_check_volume(struct ubi_device *ubi, int vol_id);
|
||||
void ubi_calculate_reserved(struct ubi_device *ubi);
|
||||
|
||||
/* gluebi.c */
|
||||
#ifdef CONFIG_MTD_UBI_GLUEBI
|
||||
int ubi_create_gluebi(struct ubi_device *ubi, struct ubi_volume *vol);
|
||||
int ubi_destroy_gluebi(struct ubi_volume *vol);
|
||||
void ubi_gluebi_updated(struct ubi_volume *vol);
|
||||
#else
|
||||
#define ubi_create_gluebi(ubi, vol) 0
|
||||
#define ubi_destroy_gluebi(vol) 0
|
||||
#define ubi_gluebi_updated(vol)
|
||||
#endif
|
||||
|
||||
/* eba.c */
|
||||
int ubi_eba_unmap_leb(struct ubi_device *ubi, struct ubi_volume *vol,
|
||||
int lnum);
|
||||
|
@ -549,6 +553,16 @@ 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.
|
||||
|
|
|
@ -68,10 +68,10 @@ static int set_update_marker(struct ubi_device *ubi, struct ubi_volume *vol)
|
|||
sizeof(struct ubi_vtbl_record));
|
||||
vtbl_rec.upd_marker = 1;
|
||||
|
||||
mutex_lock(&ubi->volumes_mutex);
|
||||
mutex_lock(&ubi->device_mutex);
|
||||
err = ubi_change_vtbl_record(ubi, vol->vol_id, &vtbl_rec);
|
||||
mutex_unlock(&ubi->volumes_mutex);
|
||||
vol->upd_marker = 1;
|
||||
mutex_unlock(&ubi->device_mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
|
@ -109,10 +109,10 @@ static int clear_update_marker(struct ubi_device *ubi, struct ubi_volume *vol,
|
|||
vol->last_eb_bytes = vol->usable_leb_size;
|
||||
}
|
||||
|
||||
mutex_lock(&ubi->volumes_mutex);
|
||||
mutex_lock(&ubi->device_mutex);
|
||||
err = ubi_change_vtbl_record(ubi, vol->vol_id, &vtbl_rec);
|
||||
mutex_unlock(&ubi->volumes_mutex);
|
||||
vol->upd_marker = 0;
|
||||
mutex_unlock(&ubi->device_mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
|
|
|
@ -198,7 +198,7 @@ static void volume_sysfs_close(struct ubi_volume *vol)
|
|||
* %UBI_VOL_NUM_AUTO, this function automatically assign ID to the new volume
|
||||
* and saves it in @req->vol_id. Returns zero in case of success and a negative
|
||||
* error code in case of failure. Note, the caller has to have the
|
||||
* @ubi->volumes_mutex locked.
|
||||
* @ubi->device_mutex locked.
|
||||
*/
|
||||
int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
|
||||
{
|
||||
|
@ -232,8 +232,8 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
|
|||
req->vol_id = vol_id;
|
||||
}
|
||||
|
||||
dbg_gen("volume ID %d, %llu bytes, type %d, name %s",
|
||||
vol_id, (unsigned long long)req->bytes,
|
||||
dbg_gen("create device %d, volume %d, %llu bytes, type %d, name %s",
|
||||
ubi->ubi_num, vol_id, (unsigned long long)req->bytes,
|
||||
(int)req->vol_type, req->name);
|
||||
|
||||
/* Ensure that this volume does not exist */
|
||||
|
@ -317,10 +317,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
|
|||
goto out_mapping;
|
||||
}
|
||||
|
||||
err = ubi_create_gluebi(ubi, vol);
|
||||
if (err)
|
||||
goto out_cdev;
|
||||
|
||||
vol->dev.release = vol_release;
|
||||
vol->dev.parent = &ubi->dev;
|
||||
vol->dev.devt = dev;
|
||||
|
@ -330,7 +326,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
|
|||
err = device_register(&vol->dev);
|
||||
if (err) {
|
||||
ubi_err("cannot register device");
|
||||
goto out_gluebi;
|
||||
goto out_cdev;
|
||||
}
|
||||
|
||||
err = volume_sysfs_init(ubi, vol);
|
||||
|
@ -358,7 +354,9 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
|
|||
ubi->vol_count += 1;
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
|
||||
err = paranoid_check_volumes(ubi);
|
||||
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;
|
||||
|
||||
out_sysfs:
|
||||
|
@ -373,10 +371,6 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
|
|||
do_free = 0;
|
||||
get_device(&vol->dev);
|
||||
volume_sysfs_close(vol);
|
||||
out_gluebi:
|
||||
if (ubi_destroy_gluebi(vol))
|
||||
dbg_err("cannot destroy gluebi for volume %d:%d",
|
||||
ubi->ubi_num, vol_id);
|
||||
out_cdev:
|
||||
cdev_del(&vol->cdev);
|
||||
out_mapping:
|
||||
|
@ -403,7 +397,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
|
|||
*
|
||||
* This function removes volume described by @desc. The volume has to be opened
|
||||
* in "exclusive" mode. Returns zero in case of success and a negative error
|
||||
* code in case of failure. The caller has to have the @ubi->volumes_mutex
|
||||
* code in case of failure. The caller has to have the @ubi->device_mutex
|
||||
* locked.
|
||||
*/
|
||||
int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
|
||||
|
@ -412,7 +406,7 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
|
|||
struct ubi_device *ubi = vol->ubi;
|
||||
int i, err, vol_id = vol->vol_id, reserved_pebs = vol->reserved_pebs;
|
||||
|
||||
dbg_gen("remove UBI volume %d", vol_id);
|
||||
dbg_gen("remove device %d, volume %d", ubi->ubi_num, vol_id);
|
||||
ubi_assert(desc->mode == UBI_EXCLUSIVE);
|
||||
ubi_assert(vol == ubi->volumes[vol_id]);
|
||||
|
||||
|
@ -431,10 +425,6 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
|
|||
ubi->volumes[vol_id] = NULL;
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
|
||||
err = ubi_destroy_gluebi(vol);
|
||||
if (err)
|
||||
goto out_err;
|
||||
|
||||
if (!no_vtbl) {
|
||||
err = ubi_change_vtbl_record(ubi, vol_id, NULL);
|
||||
if (err)
|
||||
|
@ -465,8 +455,10 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
|
|||
ubi->vol_count -= 1;
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
|
||||
if (!no_vtbl)
|
||||
err = paranoid_check_volumes(ubi);
|
||||
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);
|
||||
|
||||
return err;
|
||||
|
||||
out_err:
|
||||
|
@ -485,7 +477,7 @@ int ubi_remove_volume(struct ubi_volume_desc *desc, int no_vtbl)
|
|||
*
|
||||
* This function re-sizes the volume and returns zero in case of success, and a
|
||||
* negative error code in case of failure. The caller has to have the
|
||||
* @ubi->volumes_mutex locked.
|
||||
* @ubi->device_mutex locked.
|
||||
*/
|
||||
int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
|
||||
{
|
||||
|
@ -498,8 +490,8 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
|
|||
if (ubi->ro_mode)
|
||||
return -EROFS;
|
||||
|
||||
dbg_gen("re-size volume %d to from %d to %d PEBs",
|
||||
vol_id, vol->reserved_pebs, reserved_pebs);
|
||||
dbg_gen("re-size device %d, volume %d to from %d to %d PEBs",
|
||||
ubi->ubi_num, vol_id, vol->reserved_pebs, reserved_pebs);
|
||||
|
||||
if (vol->vol_type == UBI_STATIC_VOLUME &&
|
||||
reserved_pebs < vol->used_ebs) {
|
||||
|
@ -587,7 +579,9 @@ int ubi_resize_volume(struct ubi_volume_desc *desc, int reserved_pebs)
|
|||
(long long)vol->used_ebs * vol->usable_leb_size;
|
||||
}
|
||||
|
||||
err = paranoid_check_volumes(ubi);
|
||||
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;
|
||||
|
||||
out_acc:
|
||||
|
@ -632,11 +626,12 @@ 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);
|
||||
}
|
||||
}
|
||||
|
||||
if (!err)
|
||||
err = paranoid_check_volumes(ubi);
|
||||
if (!err && paranoid_check_volumes(ubi))
|
||||
;
|
||||
return err;
|
||||
}
|
||||
|
||||
|
@ -667,10 +662,6 @@ int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
|
|||
return err;
|
||||
}
|
||||
|
||||
err = ubi_create_gluebi(ubi, vol);
|
||||
if (err)
|
||||
goto out_cdev;
|
||||
|
||||
vol->dev.release = vol_release;
|
||||
vol->dev.parent = &ubi->dev;
|
||||
vol->dev.devt = dev;
|
||||
|
@ -678,21 +669,19 @@ int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
|
|||
dev_set_name(&vol->dev, "%s_%d", ubi->ubi_name, vol->vol_id);
|
||||
err = device_register(&vol->dev);
|
||||
if (err)
|
||||
goto out_gluebi;
|
||||
goto out_cdev;
|
||||
|
||||
err = volume_sysfs_init(ubi, vol);
|
||||
if (err) {
|
||||
cdev_del(&vol->cdev);
|
||||
err = ubi_destroy_gluebi(vol);
|
||||
volume_sysfs_close(vol);
|
||||
return err;
|
||||
}
|
||||
|
||||
err = paranoid_check_volumes(ubi);
|
||||
if (paranoid_check_volumes(ubi))
|
||||
dbg_err("check failed while adding volume %d", vol_id);
|
||||
return err;
|
||||
|
||||
out_gluebi:
|
||||
err = ubi_destroy_gluebi(vol);
|
||||
out_cdev:
|
||||
cdev_del(&vol->cdev);
|
||||
return err;
|
||||
|
@ -708,12 +697,9 @@ int ubi_add_volume(struct ubi_device *ubi, struct ubi_volume *vol)
|
|||
*/
|
||||
void ubi_free_volume(struct ubi_device *ubi, struct ubi_volume *vol)
|
||||
{
|
||||
int err;
|
||||
|
||||
dbg_gen("free volume %d", vol->vol_id);
|
||||
|
||||
ubi->volumes[vol->vol_id] = NULL;
|
||||
err = ubi_destroy_gluebi(vol);
|
||||
cdev_del(&vol->cdev);
|
||||
volume_sysfs_close(vol);
|
||||
}
|
||||
|
@ -868,6 +854,7 @@ static int paranoid_check_volume(struct ubi_device *ubi, int vol_id)
|
|||
if (vol)
|
||||
ubi_dbg_dump_vol_info(vol);
|
||||
ubi_dbg_dump_vtbl_record(&ubi->vtbl[vol_id], vol_id);
|
||||
dump_stack();
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
|
@ -55,8 +55,8 @@
|
|||
*
|
||||
* As it was said, for the UBI sub-system all physical eraseblocks are either
|
||||
* "free" or "used". Free eraseblock are kept in the @wl->free RB-tree, while
|
||||
* used eraseblocks are kept in @wl->used or @wl->scrub RB-trees, or
|
||||
* (temporarily) in the @wl->pq queue.
|
||||
* used eraseblocks are kept in @wl->used, @wl->erroneous, or @wl->scrub
|
||||
* RB-trees, as well as (temporarily) in the @wl->pq queue.
|
||||
*
|
||||
* When the WL sub-system returns a physical eraseblock, the physical
|
||||
* eraseblock is protected from being moved for some "time". For this reason,
|
||||
|
@ -83,6 +83,8 @@
|
|||
* used. The former state corresponds to the @wl->free tree. The latter state
|
||||
* is split up on several sub-states:
|
||||
* o the WL movement is allowed (@wl->used tree);
|
||||
* o the WL movement is disallowed (@wl->erroneous) because the PEB is
|
||||
* erroneous - e.g., there was a read error;
|
||||
* o the WL movement is temporarily prohibited (@wl->pq queue);
|
||||
* o scrubbing is needed (@wl->scrub tree).
|
||||
*
|
||||
|
@ -653,7 +655,8 @@ static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
|
|||
static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
|
||||
int cancel)
|
||||
{
|
||||
int err, scrubbing = 0, torture = 0;
|
||||
int err, scrubbing = 0, torture = 0, protect = 0, erroneous = 0;
|
||||
int vol_id = -1, uninitialized_var(lnum);
|
||||
struct ubi_wl_entry *e1, *e2;
|
||||
struct ubi_vid_hdr *vid_hdr;
|
||||
|
||||
|
@ -738,68 +741,78 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
|
|||
/*
|
||||
* We are trying to move PEB without a VID header. UBI
|
||||
* always write VID headers shortly after the PEB was
|
||||
* given, so we have a situation when it did not have
|
||||
* chance to write it down because it was preempted.
|
||||
* Just re-schedule the work, so that next time it will
|
||||
* likely have the VID header in place.
|
||||
* given, so we have a situation when it has not yet
|
||||
* had a chance to write it, because it was preempted.
|
||||
* So add this PEB to the protection queue so far,
|
||||
* because presumably more data will be written there
|
||||
* (including the missing VID header), and then we'll
|
||||
* move it.
|
||||
*/
|
||||
dbg_wl("PEB %d has no VID header", e1->pnum);
|
||||
protect = 1;
|
||||
goto out_not_moved;
|
||||
}
|
||||
|
||||
ubi_err("error %d while reading VID header from PEB %d",
|
||||
err, e1->pnum);
|
||||
if (err > 0)
|
||||
err = -EIO;
|
||||
goto out_error;
|
||||
}
|
||||
|
||||
vol_id = be32_to_cpu(vid_hdr->vol_id);
|
||||
lnum = be32_to_cpu(vid_hdr->lnum);
|
||||
|
||||
err = ubi_eba_copy_leb(ubi, e1->pnum, e2->pnum, vid_hdr);
|
||||
if (err) {
|
||||
if (err == -EAGAIN)
|
||||
if (err == MOVE_CANCEL_RACE) {
|
||||
/*
|
||||
* The LEB has not been moved because the volume is
|
||||
* being deleted or the PEB has been put meanwhile. We
|
||||
* should prevent this PEB from being selected for
|
||||
* wear-leveling movement again, so put it to the
|
||||
* protection queue.
|
||||
*/
|
||||
protect = 1;
|
||||
goto out_not_moved;
|
||||
if (err < 0)
|
||||
goto out_error;
|
||||
if (err == 2) {
|
||||
/* Target PEB write error, torture it */
|
||||
}
|
||||
|
||||
if (err == MOVE_CANCEL_BITFLIPS || err == MOVE_TARGET_WR_ERR ||
|
||||
err == MOVE_TARGET_RD_ERR) {
|
||||
/*
|
||||
* Target PEB had bit-flips or write error - torture it.
|
||||
*/
|
||||
torture = 1;
|
||||
goto out_not_moved;
|
||||
}
|
||||
|
||||
/*
|
||||
* The LEB has not been moved because the volume is being
|
||||
* deleted or the PEB has been put meanwhile. We should prevent
|
||||
* this PEB from being selected for wear-leveling movement
|
||||
* again, so put it to the protection queue.
|
||||
*/
|
||||
if (err == MOVE_SOURCE_RD_ERR) {
|
||||
/*
|
||||
* An error happened while reading the source PEB. Do
|
||||
* not switch to R/O mode in this case, and give the
|
||||
* upper layers a possibility to recover from this,
|
||||
* e.g. by unmapping corresponding LEB. Instead, just
|
||||
* put this PEB to the @ubi->erroneous list to prevent
|
||||
* UBI from trying to move it over and over again.
|
||||
*/
|
||||
if (ubi->erroneous_peb_count > ubi->max_erroneous) {
|
||||
ubi_err("too many erroneous eraseblocks (%d)",
|
||||
ubi->erroneous_peb_count);
|
||||
goto out_error;
|
||||
}
|
||||
erroneous = 1;
|
||||
goto out_not_moved;
|
||||
}
|
||||
|
||||
dbg_wl("canceled moving PEB %d", e1->pnum);
|
||||
ubi_assert(err == 1);
|
||||
|
||||
ubi_free_vid_hdr(ubi, vid_hdr);
|
||||
vid_hdr = NULL;
|
||||
|
||||
spin_lock(&ubi->wl_lock);
|
||||
prot_queue_add(ubi, e1);
|
||||
ubi_assert(!ubi->move_to_put);
|
||||
ubi->move_from = ubi->move_to = NULL;
|
||||
ubi->wl_scheduled = 0;
|
||||
spin_unlock(&ubi->wl_lock);
|
||||
|
||||
e1 = NULL;
|
||||
err = schedule_erase(ubi, e2, 0);
|
||||
if (err)
|
||||
if (err < 0)
|
||||
goto out_error;
|
||||
mutex_unlock(&ubi->move_mutex);
|
||||
return 0;
|
||||
|
||||
ubi_assert(0);
|
||||
}
|
||||
|
||||
/* The PEB has been successfully moved */
|
||||
ubi_free_vid_hdr(ubi, vid_hdr);
|
||||
vid_hdr = NULL;
|
||||
if (scrubbing)
|
||||
ubi_msg("scrubbed PEB %d, data moved to PEB %d",
|
||||
e1->pnum, e2->pnum);
|
||||
ubi_msg("scrubbed PEB %d (LEB %d:%d), data moved to PEB %d",
|
||||
e1->pnum, vol_id, lnum, e2->pnum);
|
||||
ubi_free_vid_hdr(ubi, vid_hdr);
|
||||
|
||||
spin_lock(&ubi->wl_lock);
|
||||
if (!ubi->move_to_put) {
|
||||
|
@ -812,8 +825,10 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
|
|||
|
||||
err = schedule_erase(ubi, e1, 0);
|
||||
if (err) {
|
||||
e1 = NULL;
|
||||
goto out_error;
|
||||
kmem_cache_free(ubi_wl_entry_slab, e1);
|
||||
if (e2)
|
||||
kmem_cache_free(ubi_wl_entry_slab, e2);
|
||||
goto out_ro;
|
||||
}
|
||||
|
||||
if (e2) {
|
||||
|
@ -821,10 +836,13 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
|
|||
* Well, the target PEB was put meanwhile, schedule it for
|
||||
* erasure.
|
||||
*/
|
||||
dbg_wl("PEB %d was put meanwhile, erase", e2->pnum);
|
||||
dbg_wl("PEB %d (LEB %d:%d) was put meanwhile, erase",
|
||||
e2->pnum, vol_id, lnum);
|
||||
err = schedule_erase(ubi, e2, 0);
|
||||
if (err)
|
||||
goto out_error;
|
||||
if (err) {
|
||||
kmem_cache_free(ubi_wl_entry_slab, e2);
|
||||
goto out_ro;
|
||||
}
|
||||
}
|
||||
|
||||
dbg_wl("done");
|
||||
|
@ -837,11 +855,19 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
|
|||
* have been changed, schedule it for erasure.
|
||||
*/
|
||||
out_not_moved:
|
||||
dbg_wl("canceled moving PEB %d", e1->pnum);
|
||||
ubi_free_vid_hdr(ubi, vid_hdr);
|
||||
vid_hdr = NULL;
|
||||
if (vol_id != -1)
|
||||
dbg_wl("cancel moving PEB %d (LEB %d:%d) to PEB %d (%d)",
|
||||
e1->pnum, vol_id, lnum, e2->pnum, err);
|
||||
else
|
||||
dbg_wl("cancel moving PEB %d to PEB %d (%d)",
|
||||
e1->pnum, e2->pnum, err);
|
||||
spin_lock(&ubi->wl_lock);
|
||||
if (scrubbing)
|
||||
if (protect)
|
||||
prot_queue_add(ubi, e1);
|
||||
else if (erroneous) {
|
||||
wl_tree_add(e1, &ubi->erroneous);
|
||||
ubi->erroneous_peb_count += 1;
|
||||
} else if (scrubbing)
|
||||
wl_tree_add(e1, &ubi->scrub);
|
||||
else
|
||||
wl_tree_add(e1, &ubi->used);
|
||||
|
@ -850,32 +876,36 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
|
|||
ubi->wl_scheduled = 0;
|
||||
spin_unlock(&ubi->wl_lock);
|
||||
|
||||
e1 = NULL;
|
||||
ubi_free_vid_hdr(ubi, vid_hdr);
|
||||
err = schedule_erase(ubi, e2, torture);
|
||||
if (err)
|
||||
goto out_error;
|
||||
|
||||
if (err) {
|
||||
kmem_cache_free(ubi_wl_entry_slab, e2);
|
||||
goto out_ro;
|
||||
}
|
||||
mutex_unlock(&ubi->move_mutex);
|
||||
return 0;
|
||||
|
||||
out_error:
|
||||
ubi_err("error %d while moving PEB %d to PEB %d",
|
||||
err, e1->pnum, e2->pnum);
|
||||
|
||||
ubi_free_vid_hdr(ubi, vid_hdr);
|
||||
if (vol_id != -1)
|
||||
ubi_err("error %d while moving PEB %d to PEB %d",
|
||||
err, e1->pnum, e2->pnum);
|
||||
else
|
||||
ubi_err("error %d while moving PEB %d (LEB %d:%d) to PEB %d",
|
||||
err, e1->pnum, vol_id, lnum, e2->pnum);
|
||||
spin_lock(&ubi->wl_lock);
|
||||
ubi->move_from = ubi->move_to = NULL;
|
||||
ubi->move_to_put = ubi->wl_scheduled = 0;
|
||||
spin_unlock(&ubi->wl_lock);
|
||||
|
||||
if (e1)
|
||||
kmem_cache_free(ubi_wl_entry_slab, e1);
|
||||
if (e2)
|
||||
kmem_cache_free(ubi_wl_entry_slab, e2);
|
||||
ubi_ro_mode(ubi);
|
||||
ubi_free_vid_hdr(ubi, vid_hdr);
|
||||
kmem_cache_free(ubi_wl_entry_slab, e1);
|
||||
kmem_cache_free(ubi_wl_entry_slab, e2);
|
||||
|
||||
out_ro:
|
||||
ubi_ro_mode(ubi);
|
||||
mutex_unlock(&ubi->move_mutex);
|
||||
return err;
|
||||
ubi_assert(err != 0);
|
||||
return err < 0 ? err : -EIO;
|
||||
|
||||
out_cancel:
|
||||
ubi->wl_scheduled = 0;
|
||||
|
@ -1015,7 +1045,7 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
|
|||
/*
|
||||
* If this is not %-EIO, we have no idea what to do. Scheduling
|
||||
* this physical eraseblock for erasure again would cause
|
||||
* errors again and again. Well, lets switch to RO mode.
|
||||
* errors again and again. Well, lets switch to R/O mode.
|
||||
*/
|
||||
goto out_ro;
|
||||
}
|
||||
|
@ -1043,10 +1073,9 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
|
|||
ubi_err("no reserved physical eraseblocks");
|
||||
goto out_ro;
|
||||
}
|
||||
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
ubi_msg("mark PEB %d as bad", pnum);
|
||||
|
||||
ubi_msg("mark PEB %d as bad", pnum);
|
||||
err = ubi_io_mark_bad(ubi, pnum);
|
||||
if (err)
|
||||
goto out_ro;
|
||||
|
@ -1056,7 +1085,9 @@ static int erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk,
|
|||
ubi->bad_peb_count += 1;
|
||||
ubi->good_peb_count -= 1;
|
||||
ubi_calculate_reserved(ubi);
|
||||
if (ubi->beb_rsvd_pebs == 0)
|
||||
if (ubi->beb_rsvd_pebs)
|
||||
ubi_msg("%d PEBs left in the reserve", ubi->beb_rsvd_pebs);
|
||||
else
|
||||
ubi_warn("last PEB from the reserved pool was used");
|
||||
spin_unlock(&ubi->volumes_lock);
|
||||
|
||||
|
@ -1125,6 +1156,13 @@ int ubi_wl_put_peb(struct ubi_device *ubi, int pnum, int torture)
|
|||
} else if (in_wl_tree(e, &ubi->scrub)) {
|
||||
paranoid_check_in_wl_tree(e, &ubi->scrub);
|
||||
rb_erase(&e->u.rb, &ubi->scrub);
|
||||
} else if (in_wl_tree(e, &ubi->erroneous)) {
|
||||
paranoid_check_in_wl_tree(e, &ubi->erroneous);
|
||||
rb_erase(&e->u.rb, &ubi->erroneous);
|
||||
ubi->erroneous_peb_count -= 1;
|
||||
ubi_assert(ubi->erroneous_peb_count >= 0);
|
||||
/* Erroneous PEBs should be tortured */
|
||||
torture = 1;
|
||||
} else {
|
||||
err = prot_queue_del(ubi, e->pnum);
|
||||
if (err) {
|
||||
|
@ -1373,7 +1411,7 @@ int ubi_wl_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si)
|
|||
struct ubi_scan_leb *seb, *tmp;
|
||||
struct ubi_wl_entry *e;
|
||||
|
||||
ubi->used = ubi->free = ubi->scrub = RB_ROOT;
|
||||
ubi->used = ubi->erroneous = ubi->free = ubi->scrub = RB_ROOT;
|
||||
spin_lock_init(&ubi->wl_lock);
|
||||
mutex_init(&ubi->move_mutex);
|
||||
init_rwsem(&ubi->work_sem);
|
||||
|
@ -1511,6 +1549,7 @@ void ubi_wl_close(struct ubi_device *ubi)
|
|||
cancel_pending(ubi);
|
||||
protection_queue_destroy(ubi);
|
||||
tree_destroy(&ubi->used);
|
||||
tree_destroy(&ubi->erroneous);
|
||||
tree_destroy(&ubi->free);
|
||||
tree_destroy(&ubi->scrub);
|
||||
kfree(ubi->lookuptbl);
|
||||
|
|
|
@ -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);
|
||||
|
|
Loading…
Reference in a new issue