return btrfs_raid_array[type].raid_name;
}
+/*
+ * Fill @buf with textual description of @bg_flags, no more than @size_buf
+ * bytes including terminating null byte.
+ */
+void btrfs_describe_block_groups(u64 bg_flags, char *buf, u32 size_buf)
+{
+ int i;
+ int ret;
+ char *bp = buf;
+ u64 flags = bg_flags;
+ u32 size_bp = size_buf;
+
+ if (!flags) {
+ strcpy(bp, "NONE");
+ return;
+ }
+
+#define DESCRIBE_FLAG(flag, desc) \
+ do { \
+ if (flags & (flag)) { \
+ ret = snprintf(bp, size_bp, "%s|", (desc)); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out_overflow; \
+ size_bp -= ret; \
+ bp += ret; \
+ flags &= ~(flag); \
+ } \
+ } while (0)
+
+ DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_DATA, "data");
+ DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_SYSTEM, "system");
+ DESCRIBE_FLAG(BTRFS_BLOCK_GROUP_METADATA, "metadata");
+
+ DESCRIBE_FLAG(BTRFS_AVAIL_ALLOC_BIT_SINGLE, "single");
+ for (i = 0; i < BTRFS_NR_RAID_TYPES; i++)
+ DESCRIBE_FLAG(btrfs_raid_array[i].bg_flag,
+ btrfs_raid_array[i].raid_name);
+#undef DESCRIBE_FLAG
+
+ if (flags) {
+ ret = snprintf(bp, size_bp, "0x%llx|", flags);
+ size_bp -= ret;
+ }
+
+ if (size_bp < size_buf)
+ buf[size_buf - size_bp - 1] = '\0'; /* remove last | */
+
+ /*
+ * The text is trimmed, it's up to the caller to provide sufficiently
+ * large buffer
+ */
+out_overflow:;
+}
+
static int init_first_rw_device(struct btrfs_trans_handle *trans,
struct btrfs_fs_info *fs_info);
static int btrfs_relocate_sys_chunks(struct btrfs_fs_info *fs_info);
* the mutex can be very coarse and can cover long-running operations
*
* protects: updates to fs_devices counters like missing devices, rw devices,
- * seeding, structure cloning, openning/closing devices at mount/umount time
+ * seeding, structure cloning, opening/closing devices at mount/umount time
*
* global::fs_devs - add, remove, updates to the global list
*
return fs_devices;
}
}
+ /*
+ * Handle scanned device having completed its fsid change but
+ * belonging to a fs_devices that was created by a device that
+ * has an outdated pair of fsid/metadata_uuid and
+ * CHANGING_FSID_V2 flag set.
+ */
+ list_for_each_entry(fs_devices, &fs_uuids, fs_list) {
+ if (fs_devices->fsid_change &&
+ memcmp(fs_devices->metadata_uuid,
+ fs_devices->fsid, BTRFS_FSID_SIZE) != 0 &&
+ memcmp(metadata_fsid, fs_devices->metadata_uuid,
+ BTRFS_FSID_SIZE) == 0) {
+ return fs_devices;
+ }
+ }
}
/* Handle non-split brain cases */
return NULL;
}
+
+static struct btrfs_fs_devices *find_fsid_changed(
+ struct btrfs_super_block *disk_super)
+{
+ struct btrfs_fs_devices *fs_devices;
+
+ /*
+ * Handles the case where scanned device is part of an fs that had
+ * multiple successful changes of FSID but curently device didn't
+ * observe it. Meaning our fsid will be different than theirs.
+ */
+ list_for_each_entry(fs_devices, &fs_uuids, fs_list) {
+ if (memcmp(fs_devices->metadata_uuid, fs_devices->fsid,
+ BTRFS_FSID_SIZE) != 0 &&
+ memcmp(fs_devices->metadata_uuid, disk_super->metadata_uuid,
+ BTRFS_FSID_SIZE) == 0 &&
+ memcmp(fs_devices->fsid, disk_super->fsid,
+ BTRFS_FSID_SIZE) != 0) {
+ return fs_devices;
+ }
+ }
+
+ return NULL;
+}
/*
* Add new device to list of registered devices
*
bool fsid_change_in_progress = (btrfs_super_flags(disk_super) &
BTRFS_SUPER_FLAG_CHANGING_FSID_V2);
- if (fsid_change_in_progress && !has_metadata_uuid) {
- /*
- * When we have an image which has CHANGING_FSID_V2 set it might
- * belong to either a filesystem which has disks with completed
- * fsid change or it might belong to fs with no UUID changes in
- * effect, handle both.
- */
- fs_devices = find_fsid_inprogress(disk_super);
- if (!fs_devices)
- fs_devices = find_fsid(disk_super->fsid, NULL);
-
+ if (fsid_change_in_progress) {
+ if (!has_metadata_uuid) {
+ /*
+ * When we have an image which has CHANGING_FSID_V2 set
+ * it might belong to either a filesystem which has
+ * disks with completed fsid change or it might belong
+ * to fs with no UUID changes in effect, handle both.
+ */
+ fs_devices = find_fsid_inprogress(disk_super);
+ if (!fs_devices)
+ fs_devices = find_fsid(disk_super->fsid, NULL);
+ } else {
+ fs_devices = find_fsid_changed(disk_super);
+ }
} else if (has_metadata_uuid) {
fs_devices = find_fsid(disk_super->fsid,
disk_super->metadata_uuid);
else
fs_devices = alloc_fs_devices(disk_super->fsid, NULL);
- fs_devices->fsid_change = fsid_change_in_progress;
-
if (IS_ERR(fs_devices))
return ERR_CAST(fs_devices);
+ fs_devices->fsid_change = fsid_change_in_progress;
+
mutex_lock(&fs_devices->device_list_mutex);
list_add(&fs_devices->fs_list, &fs_uuids);
p = kmap(*page);
/* align our pointer to the offset of the super block */
- *disk_super = p + (bytenr & ~PAGE_MASK);
+ *disk_super = p + offset_in_page(bytenr);
if (btrfs_super_bytenr(*disk_super) != bytenr ||
btrfs_super_magic(*disk_super) != BTRFS_MAGIC) {
{
u64 num_devices = fs_info->fs_devices->num_devices;
- btrfs_dev_replace_read_lock(&fs_info->dev_replace);
+ down_read(&fs_info->dev_replace.rwsem);
if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace)) {
ASSERT(num_devices > 1);
num_devices--;
}
- btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
+ up_read(&fs_info->dev_replace.rwsem);
return num_devices;
}
{
struct btrfs_balance_control *bctl = fs_info->balance_ctl;
struct btrfs_root *chunk_root = fs_info->chunk_root;
- struct btrfs_root *dev_root = fs_info->dev_root;
- struct list_head *devices;
- struct btrfs_device *device;
- u64 old_size;
- u64 size_to_free;
u64 chunk_type;
struct btrfs_chunk *chunk;
struct btrfs_path *path = NULL;
struct btrfs_key key;
struct btrfs_key found_key;
- struct btrfs_trans_handle *trans;
struct extent_buffer *leaf;
int slot;
int ret;
u32 count_sys = 0;
int chunk_reserved = 0;
- /* step one make some room on all the devices */
- devices = &fs_info->fs_devices->devices;
- list_for_each_entry(device, devices, dev_list) {
- old_size = btrfs_device_get_total_bytes(device);
- size_to_free = div_factor(old_size, 1);
- size_to_free = min_t(u64, size_to_free, SZ_1M);
- if (!test_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state) ||
- btrfs_device_get_total_bytes(device) -
- btrfs_device_get_bytes_used(device) > size_to_free ||
- test_bit(BTRFS_DEV_STATE_REPLACE_TGT, &device->dev_state))
- continue;
-
- ret = btrfs_shrink_device(device, old_size - size_to_free);
- if (ret == -ENOSPC)
- break;
- if (ret) {
- /* btrfs_shrink_device never returns ret > 0 */
- WARN_ON(ret > 0);
- goto error;
- }
-
- trans = btrfs_start_transaction(dev_root, 0);
- if (IS_ERR(trans)) {
- ret = PTR_ERR(trans);
- btrfs_info_in_rcu(fs_info,
- "resize: unable to start transaction after shrinking device %s (error %d), old size %llu, new size %llu",
- rcu_str_deref(device->name), ret,
- old_size, old_size - size_to_free);
- goto error;
- }
-
- ret = btrfs_grow_device(trans, device, old_size);
- if (ret) {
- btrfs_end_transaction(trans);
- /* btrfs_grow_device never returns ret > 0 */
- WARN_ON(ret > 0);
- btrfs_info_in_rcu(fs_info,
- "resize: unable to grow device after shrinking device %s (error %d), old size %llu, new size %llu",
- rcu_str_deref(device->name), ret,
- old_size, old_size - size_to_free);
- goto error;
- }
-
- btrfs_end_transaction(trans);
- }
-
- /* step two, relocate all the chunks */
path = btrfs_alloc_path();
if (!path) {
ret = -ENOMEM;
(bctl_arg->target & ~allowed)));
}
+/*
+ * Fill @buf with textual description of balance filter flags @bargs, up to
+ * @size_buf including the terminating null. The output may be trimmed if it
+ * does not fit into the provided buffer.
+ */
+static void describe_balance_args(struct btrfs_balance_args *bargs, char *buf,
+ u32 size_buf)
+{
+ int ret;
+ u32 size_bp = size_buf;
+ char *bp = buf;
+ u64 flags = bargs->flags;
+ char tmp_buf[128] = {'\0'};
+
+ if (!flags)
+ return;
+
+#define CHECK_APPEND_NOARG(a) \
+ do { \
+ ret = snprintf(bp, size_bp, (a)); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out_overflow; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+#define CHECK_APPEND_1ARG(a, v1) \
+ do { \
+ ret = snprintf(bp, size_bp, (a), (v1)); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out_overflow; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+#define CHECK_APPEND_2ARG(a, v1, v2) \
+ do { \
+ ret = snprintf(bp, size_bp, (a), (v1), (v2)); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out_overflow; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+ if (flags & BTRFS_BALANCE_ARGS_CONVERT) {
+ int index = btrfs_bg_flags_to_raid_index(bargs->target);
+
+ CHECK_APPEND_1ARG("convert=%s,", get_raid_name(index));
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_SOFT)
+ CHECK_APPEND_NOARG("soft,");
+
+ if (flags & BTRFS_BALANCE_ARGS_PROFILES) {
+ btrfs_describe_block_groups(bargs->profiles, tmp_buf,
+ sizeof(tmp_buf));
+ CHECK_APPEND_1ARG("profiles=%s,", tmp_buf);
+ }
+
+ if (flags & BTRFS_BALANCE_ARGS_USAGE)
+ CHECK_APPEND_1ARG("usage=%llu,", bargs->usage);
+
+ if (flags & BTRFS_BALANCE_ARGS_USAGE_RANGE)
+ CHECK_APPEND_2ARG("usage=%u..%u,",
+ bargs->usage_min, bargs->usage_max);
+
+ if (flags & BTRFS_BALANCE_ARGS_DEVID)
+ CHECK_APPEND_1ARG("devid=%llu,", bargs->devid);
+
+ if (flags & BTRFS_BALANCE_ARGS_DRANGE)
+ CHECK_APPEND_2ARG("drange=%llu..%llu,",
+ bargs->pstart, bargs->pend);
+
+ if (flags & BTRFS_BALANCE_ARGS_VRANGE)
+ CHECK_APPEND_2ARG("vrange=%llu..%llu,",
+ bargs->vstart, bargs->vend);
+
+ if (flags & BTRFS_BALANCE_ARGS_LIMIT)
+ CHECK_APPEND_1ARG("limit=%llu,", bargs->limit);
+
+ if (flags & BTRFS_BALANCE_ARGS_LIMIT_RANGE)
+ CHECK_APPEND_2ARG("limit=%u..%u,",
+ bargs->limit_min, bargs->limit_max);
+
+ if (flags & BTRFS_BALANCE_ARGS_STRIPES_RANGE)
+ CHECK_APPEND_2ARG("stripes=%u..%u,",
+ bargs->stripes_min, bargs->stripes_max);
+
+#undef CHECK_APPEND_2ARG
+#undef CHECK_APPEND_1ARG
+#undef CHECK_APPEND_NOARG
+
+out_overflow:
+
+ if (size_bp < size_buf)
+ buf[size_buf - size_bp - 1] = '\0'; /* remove last , */
+ else
+ buf[0] = '\0';
+}
+
+static void describe_balance_start_or_resume(struct btrfs_fs_info *fs_info)
+{
+ u32 size_buf = 1024;
+ char tmp_buf[192] = {'\0'};
+ char *buf;
+ char *bp;
+ u32 size_bp = size_buf;
+ int ret;
+ struct btrfs_balance_control *bctl = fs_info->balance_ctl;
+
+ buf = kzalloc(size_buf, GFP_KERNEL);
+ if (!buf)
+ return;
+
+ bp = buf;
+
+#define CHECK_APPEND_1ARG(a, v1) \
+ do { \
+ ret = snprintf(bp, size_bp, (a), (v1)); \
+ if (ret < 0 || ret >= size_bp) \
+ goto out_overflow; \
+ size_bp -= ret; \
+ bp += ret; \
+ } while (0)
+
+ if (bctl->flags & BTRFS_BALANCE_FORCE)
+ CHECK_APPEND_1ARG("%s", "-f ");
+
+ if (bctl->flags & BTRFS_BALANCE_DATA) {
+ describe_balance_args(&bctl->data, tmp_buf, sizeof(tmp_buf));
+ CHECK_APPEND_1ARG("-d%s ", tmp_buf);
+ }
+
+ if (bctl->flags & BTRFS_BALANCE_METADATA) {
+ describe_balance_args(&bctl->meta, tmp_buf, sizeof(tmp_buf));
+ CHECK_APPEND_1ARG("-m%s ", tmp_buf);
+ }
+
+ if (bctl->flags & BTRFS_BALANCE_SYSTEM) {
+ describe_balance_args(&bctl->sys, tmp_buf, sizeof(tmp_buf));
+ CHECK_APPEND_1ARG("-s%s ", tmp_buf);
+ }
+
+#undef CHECK_APPEND_1ARG
+
+out_overflow:
+
+ if (size_bp < size_buf)
+ buf[size_buf - size_bp - 1] = '\0'; /* remove last " " */
+ btrfs_info(fs_info, "balance: %s %s",
+ (bctl->flags & BTRFS_BALANCE_RESUME) ?
+ "resume" : "start", buf);
+
+ kfree(buf);
+}
+
/*
* Should be called with balance mutexe held
*/
int ret;
u64 num_devices;
unsigned seq;
+ bool reducing_integrity;
if (btrfs_fs_closing(fs_info) ||
atomic_read(&fs_info->balance_pause_req) ||
!(bctl->sys.target & allowed)) ||
((bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) &&
(fs_info->avail_metadata_alloc_bits & allowed) &&
- !(bctl->meta.target & allowed))) {
- if (bctl->flags & BTRFS_BALANCE_FORCE) {
- btrfs_info(fs_info,
- "balance: force reducing metadata integrity");
- } else {
- btrfs_err(fs_info,
- "balance: reduces metadata integrity, use --force if you want this");
- ret = -EINVAL;
- goto out;
- }
- }
+ !(bctl->meta.target & allowed)))
+ reducing_integrity = true;
+ else
+ reducing_integrity = false;
+
+ /* if we're not converting, the target field is uninitialized */
+ meta_target = (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) ?
+ bctl->meta.target : fs_info->avail_metadata_alloc_bits;
+ data_target = (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) ?
+ bctl->data.target : fs_info->avail_data_alloc_bits;
} while (read_seqretry(&fs_info->profiles_lock, seq));
- /* if we're not converting, the target field is uninitialized */
- meta_target = (bctl->meta.flags & BTRFS_BALANCE_ARGS_CONVERT) ?
- bctl->meta.target : fs_info->avail_metadata_alloc_bits;
- data_target = (bctl->data.flags & BTRFS_BALANCE_ARGS_CONVERT) ?
- bctl->data.target : fs_info->avail_data_alloc_bits;
+ if (reducing_integrity) {
+ if (bctl->flags & BTRFS_BALANCE_FORCE) {
+ btrfs_info(fs_info,
+ "balance: force reducing metadata integrity");
+ } else {
+ btrfs_err(fs_info,
+ "balance: reduces metadata integrity, use --force if you want this");
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
if (btrfs_get_num_tolerated_disk_barrier_failures(meta_target) <
btrfs_get_num_tolerated_disk_barrier_failures(data_target)) {
int meta_index = btrfs_bg_flags_to_raid_index(meta_target);
ASSERT(!test_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags));
set_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags);
+ describe_balance_start_or_resume(fs_info);
mutex_unlock(&fs_info->balance_mutex);
ret = __btrfs_balance(fs_info);
mutex_lock(&fs_info->balance_mutex);
+ if (ret == -ECANCELED && atomic_read(&fs_info->balance_pause_req))
+ btrfs_info(fs_info, "balance: paused");
+ else if (ret == -ECANCELED && atomic_read(&fs_info->balance_cancel_req))
+ btrfs_info(fs_info, "balance: canceled");
+ else
+ btrfs_info(fs_info, "balance: ended with status: %d", ret);
+
clear_bit(BTRFS_FS_BALANCE_RUNNING, &fs_info->flags);
if (bargs) {
int ret = 0;
mutex_lock(&fs_info->balance_mutex);
- if (fs_info->balance_ctl) {
- btrfs_info(fs_info, "balance: resuming");
+ if (fs_info->balance_ctl)
ret = btrfs_balance(fs_info, fs_info->balance_ctl, NULL);
- }
mutex_unlock(&fs_info->balance_mutex);
return ret;
BUG_ON(1);
}
- /* we don't want a chunk larger than 10% of writeable space */
+ /* We don't want a chunk larger than 10% of writable space */
max_chunk_size = min(div_factor(fs_devices->total_rw_bytes, 1),
max_chunk_size);
}
/*
- * Chunk allocation falls into two parts. The first part does works
- * that make the new allocated chunk useable, but not do any operation
- * that modifies the chunk tree. The second part does the works that
- * require modifying the chunk tree. This division is important for the
+ * Chunk allocation falls into two parts. The first part does work
+ * that makes the new allocated chunk usable, but does not do any operation
+ * that modifies the chunk tree. The second part does the work that
+ * requires modifying the chunk tree. This division is important for the
* bootstrap process of adding storage to a seed btrfs.
*/
int btrfs_alloc_chunk(struct btrfs_trans_handle *trans, u64 type)
ret = 1;
free_extent_map(em);
- btrfs_dev_replace_read_lock(&fs_info->dev_replace);
+ down_read(&fs_info->dev_replace.rwsem);
if (btrfs_dev_replace_is_ongoing(&fs_info->dev_replace) &&
fs_info->dev_replace.tgtdev)
ret++;
- btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
+ up_read(&fs_info->dev_replace.rwsem);
return ret;
}
*length = em->len - offset;
}
- /* This is for when we're called from btrfs_merge_bio_hook() and all
- it cares about is the length */
+ /*
+ * This is for when we're called from btrfs_bio_fits_in_stripe and all
+ * it cares about is the length
+ */
if (!bbio_ret)
goto out;
- btrfs_dev_replace_read_lock(dev_replace);
+ down_read(&dev_replace->rwsem);
dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
+ /*
+ * Hold the semaphore for read during the whole operation, write is
+ * requested at commit time but must wait.
+ */
if (!dev_replace_is_ongoing)
- btrfs_dev_replace_read_unlock(dev_replace);
- else
- btrfs_dev_replace_set_lock_blocking(dev_replace);
+ up_read(&dev_replace->rwsem);
if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
!need_full_stripe(op) && dev_replace->tgtdev != NULL) {
}
out:
if (dev_replace_is_ongoing) {
- ASSERT(atomic_read(&dev_replace->blocking_readers) > 0);
- btrfs_dev_replace_read_lock(dev_replace);
- /* Barrier implied by atomic_dec_and_test */
- if (atomic_dec_and_test(&dev_replace->blocking_readers))
- cond_wake_up_nomb(&dev_replace->read_lock_wq);
- btrfs_dev_replace_read_unlock(dev_replace);
+ lockdep_assert_held(&dev_replace->rwsem);
+ /* Unlock and let waiting writers proceed */
+ up_read(&dev_replace->rwsem);
}
free_extent_map(em);
return ret;
if (missing > max_tolerated) {
if (!failing_dev)
btrfs_warn(fs_info,
- "chunk %llu missing %d devices, max tolerance is %d for writeable mount",
+ "chunk %llu missing %d devices, max tolerance is %d for writable mount",
em->start, missing, max_tolerated);
free_extent_map(em);
ret = false;
ret = -EUCLEAN;
goto out;
}
+
+ /* 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);
+ if (!dev) {
+ btrfs_err(fs_info, "failed to find seed devid %llu",
+ devid);
+ ret = -EUCLEAN;
+ goto out;
+ }
+ }
+
if (physical_offset + physical_len > dev->disk_total_bytes) {
btrfs_err(fs_info,
"dev extent devid %llu physical offset %llu len %llu is beyond device boundary %llu",
git.samba.org / sfrench / cifs-2.6.git / blobdiff