return dev;
}
-/*
- * Find a device specified by @devid or @uuid in the list of @fs_devices, or
- * return NULL.
- *
- * If devid and uuid are both specified, the match must be exact, otherwise
- * only devid is used.
- */
-static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
- u64 devid, const u8 *uuid)
-{
- struct btrfs_device *dev;
-
- list_for_each_entry(dev, &fs_devices->devices, dev_list) {
- if (dev->devid == devid &&
- (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
- return dev;
- }
- }
- return NULL;
-}
-
static noinline struct btrfs_fs_devices *find_fsid(
const u8 *fsid, const u8 *metadata_fsid)
{
run_scheduled_bios(device);
}
+static bool device_path_matched(const char *path, struct btrfs_device *device)
+{
+ int found;
+
+ rcu_read_lock();
+ found = strcmp(rcu_str_deref(device->name), path);
+ rcu_read_unlock();
+
+ return found == 0;
+}
+
/*
* Search and remove all stale (devices which are not mounted) devices.
* When both inputs are NULL, it will search and release all stale devices.
* matching this path only.
* skip_dev: Optional. Will skip this device when searching for the stale
* devices.
+ * Return: 0 for success or if @path is NULL.
+ * -EBUSY if @path is a mounted device.
+ * -ENOENT if @path does not match any device in the list.
*/
-static void btrfs_free_stale_devices(const char *path,
+static int btrfs_free_stale_devices(const char *path,
struct btrfs_device *skip_device)
{
struct btrfs_fs_devices *fs_devices, *tmp_fs_devices;
struct btrfs_device *device, *tmp_device;
+ int ret = 0;
+
+ if (path)
+ ret = -ENOENT;
list_for_each_entry_safe(fs_devices, tmp_fs_devices, &fs_uuids, fs_list) {
- mutex_lock(&fs_devices->device_list_mutex);
- if (fs_devices->opened) {
- mutex_unlock(&fs_devices->device_list_mutex);
- continue;
- }
+ mutex_lock(&fs_devices->device_list_mutex);
list_for_each_entry_safe(device, tmp_device,
&fs_devices->devices, dev_list) {
- int not_found = 0;
-
if (skip_device && skip_device == device)
continue;
if (path && !device->name)
continue;
-
- rcu_read_lock();
- if (path)
- not_found = strcmp(rcu_str_deref(device->name),
- path);
- rcu_read_unlock();
- if (not_found)
+ if (path && !device_path_matched(path, device))
continue;
+ if (fs_devices->opened) {
+ /* for an already deleted device return 0 */
+ if (path && ret != 0)
+ ret = -EBUSY;
+ break;
+ }
/* delete the stale device */
fs_devices->num_devices--;
list_del(&device->dev_list);
btrfs_free_device(device);
+ ret = 0;
if (fs_devices->num_devices == 0)
break;
}
mutex_unlock(&fs_devices->device_list_mutex);
+
if (fs_devices->num_devices == 0) {
btrfs_sysfs_remove_fsid(fs_devices);
list_del(&fs_devices->fs_list);
free_fs_devices(fs_devices);
}
}
+
+ return ret;
}
static int btrfs_open_one_device(struct btrfs_fs_devices *fs_devices,
device = NULL;
} else {
mutex_lock(&fs_devices->device_list_mutex);
- device = find_device(fs_devices, devid,
- disk_super->dev_item.uuid);
+ device = btrfs_find_device(fs_devices, devid,
+ disk_super->dev_item.uuid, NULL, false);
/*
* If this disk has been pulled into an fs devices created by
mutex_lock(&orig->device_list_mutex);
fs_devices->total_devices = orig->total_devices;
- /* We have held the volume lock, it is safe to get the devices. */
list_for_each_entry(orig_dev, &orig->devices, dev_list) {
struct rcu_string *name;
return 0;
}
+int btrfs_forget_devices(const char *path)
+{
+ int ret;
+
+ mutex_lock(&uuid_mutex);
+ ret = btrfs_free_stale_devices(strlen(path) ? path : NULL, NULL);
+ mutex_unlock(&uuid_mutex);
+
+ return ret;
+}
+
/*
* Look for a btrfs signature on a device. This may be called out of the mount path
* and we are not allowed to call set_blocksize during the scan. The superblock
devid = btrfs_stack_device_id(&disk_super->dev_item);
dev_uuid = disk_super->dev_item.uuid;
if (btrfs_fs_incompat(fs_info, METADATA_UUID))
- device = btrfs_find_device(fs_info, devid, dev_uuid,
- disk_super->metadata_uuid);
+ device = btrfs_find_device(fs_info->fs_devices, devid, dev_uuid,
+ disk_super->metadata_uuid, true);
else
- device = btrfs_find_device(fs_info, devid,
- dev_uuid, disk_super->fsid);
+ device = btrfs_find_device(fs_info->fs_devices, devid, dev_uuid,
+ disk_super->fsid, true);
brelse(bh);
if (!device)
struct btrfs_device *device;
if (devid) {
- device = btrfs_find_device(fs_info, devid, NULL, NULL);
+ device = btrfs_find_device(fs_info->fs_devices, devid, NULL,
+ NULL, true);
if (!device)
return ERR_PTR(-ENOENT);
return device;
BTRFS_UUID_SIZE);
read_extent_buffer(leaf, fs_uuid, btrfs_device_fsid(dev_item),
BTRFS_FSID_SIZE);
- device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
+ device = btrfs_find_device(fs_info->fs_devices, devid, dev_uuid,
+ fs_uuid, true);
BUG_ON(!device); /* Logic error */
if (device->fs_devices->seeding) {
return BLK_STS_OK;
}
-struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
- u8 *uuid, u8 *fsid)
+/*
+ * Find a device specified by @devid or @uuid in the list of @fs_devices, or
+ * return NULL.
+ *
+ * If devid and uuid are both specified, the match must be exact, otherwise
+ * only devid is used.
+ *
+ * If @seed is true, traverse through the seed devices.
+ */
+struct btrfs_device *btrfs_find_device(struct btrfs_fs_devices *fs_devices,
+ u64 devid, u8 *uuid, u8 *fsid,
+ bool seed)
{
struct btrfs_device *device;
- struct btrfs_fs_devices *cur_devices;
- cur_devices = fs_info->fs_devices;
- while (cur_devices) {
+ while (fs_devices) {
if (!fsid ||
- !memcmp(cur_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE)) {
- device = find_device(cur_devices, devid, uuid);
- if (device)
- return device;
+ !memcmp(fs_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE)) {
+ list_for_each_entry(device, &fs_devices->devices,
+ dev_list) {
+ if (device->devid == devid &&
+ (!uuid || memcmp(device->uuid, uuid,
+ BTRFS_UUID_SIZE) == 0))
+ return device;
+ }
}
- cur_devices = cur_devices->seed;
+ if (seed)
+ fs_devices = fs_devices->seed;
+ else
+ return NULL;
}
return NULL;
}
}
if ((type & BTRFS_BLOCK_GROUP_RAID10 && sub_stripes != 2) ||
- (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) ||
+ (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes != 2) ||
(type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) ||
(type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) ||
- (type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) ||
+ (type & BTRFS_BLOCK_GROUP_DUP && num_stripes != 2) ||
((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 &&
num_stripes != 1)) {
btrfs_err(fs_info,
read_extent_buffer(leaf, uuid, (unsigned long)
btrfs_stripe_dev_uuid_nr(chunk, i),
BTRFS_UUID_SIZE);
- map->stripes[i].dev = btrfs_find_device(fs_info, devid,
- uuid, NULL);
+ map->stripes[i].dev = btrfs_find_device(fs_info->fs_devices,
+ devid, uuid, NULL, true);
if (!map->stripes[i].dev &&
!btrfs_test_opt(fs_info, DEGRADED)) {
free_extent_map(em);
return PTR_ERR(fs_devices);
}
- device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
+ device = btrfs_find_device(fs_info->fs_devices, devid, dev_uuid,
+ fs_uuid, true);
if (!device) {
if (!btrfs_test_opt(fs_info, DEGRADED)) {
btrfs_report_missing_device(fs_info, devid,
int i;
mutex_lock(&fs_devices->device_list_mutex);
- dev = btrfs_find_device(fs_info, stats->devid, NULL, NULL);
+ dev = btrfs_find_device(fs_info->fs_devices, stats->devid, NULL, NULL,
+ true);
mutex_unlock(&fs_devices->device_list_mutex);
if (!dev) {
}
/* Make sure no dev extent is beyond device bondary */
- dev = btrfs_find_device(fs_info, devid, NULL, NULL);
+ dev = btrfs_find_device(fs_info->fs_devices, devid, NULL, NULL, true);
if (!dev) {
btrfs_err(fs_info, "failed to find devid %llu", devid);
ret = -EUCLEAN;
/* It's possible this device is a dummy for seed device */
if (dev->disk_total_bytes == 0) {
- dev = find_device(fs_info->fs_devices->seed, devid, NULL);
+ dev = btrfs_find_device(fs_info->fs_devices->seed, devid, NULL,
+ NULL, false);
if (!dev) {
btrfs_err(fs_info, "failed to find seed devid %llu",
devid);
projects / linux.git / blobdiff