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btrfs: dev-replace: open code trivial locking helpers 

The dev-replace locking functions are now trivial wrappers around rw
semaphore that can be used directly everywhere. No functional change.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2018-09-07 16:11:23 +02:00
parent 53176dde0a
commit cb5583dd52
5 changed files with 52 additions and 74 deletions
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81
fs/btrfs/dev-replace.c
View File

@ -284,13 +284,13 @@ int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
struct btrfs_dev_replace_item *ptr;
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
btrfs_dev_replace_read_lock(dev_replace);
down_read(&dev_replace->rwsem);
if (!dev_replace->is_valid ||
!dev_replace->item_needs_writeback) {
btrfs_dev_replace_read_unlock(dev_replace);
up_read(&dev_replace->rwsem);
return 0;
}
btrfs_dev_replace_read_unlock(dev_replace);
up_read(&dev_replace->rwsem);
key.objectid = 0;
key.type = BTRFS_DEV_REPLACE_KEY;
@ -348,7 +348,7 @@ int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
ptr = btrfs_item_ptr(eb, path->slots[0],
struct btrfs_dev_replace_item);
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
if (dev_replace->srcdev)
btrfs_set_dev_replace_src_devid(eb, ptr,
dev_replace->srcdev->devid);
@ -371,7 +371,7 @@ int btrfs_run_dev_replace(struct btrfs_trans_handle *trans,
btrfs_set_dev_replace_cursor_right(eb, ptr,
dev_replace->cursor_right);
dev_replace->item_needs_writeback = 0;
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
btrfs_mark_buffer_dirty(eb);
@ -432,7 +432,7 @@ static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
}
need_unlock = true;
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
switch (dev_replace->replace_state) {
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
@ -470,7 +470,7 @@ static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
dev_replace->item_needs_writeback = 1;
atomic64_set(&dev_replace->num_write_errors, 0);
atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0);
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
need_unlock = false;
ret = btrfs_sysfs_add_device_link(tgt_device->fs_devices, tgt_device);
@ -484,7 +484,7 @@ static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
need_unlock = true;
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
dev_replace->replace_state =
BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED;
dev_replace->srcdev = NULL;
@ -511,7 +511,7 @@ static int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
leave:
if (need_unlock)
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
btrfs_destroy_dev_replace_tgtdev(tgt_device);
return ret;
}
@ -579,18 +579,18 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
/* don't allow cancel or unmount to disturb the finishing procedure */
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
btrfs_dev_replace_read_lock(dev_replace);
down_read(&dev_replace->rwsem);
/* was the operation canceled, or is it finished? */
if (dev_replace->replace_state !=
BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) {
btrfs_dev_replace_read_unlock(dev_replace);
up_read(&dev_replace->rwsem);
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
return 0;
}
tgt_device = dev_replace->tgtdev;
src_device = dev_replace->srcdev;
btrfs_dev_replace_read_unlock(dev_replace);
up_read(&dev_replace->rwsem);
/*
* flush all outstanding I/O and inode extent mappings before the
@ -614,7 +614,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
/* keep away write_all_supers() during the finishing procedure */
mutex_lock(&fs_info->fs_devices->device_list_mutex);
mutex_lock(&fs_info->chunk_mutex);
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
dev_replace->replace_state =
scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED
: BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED;
@ -635,7 +635,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
btrfs_dev_name(src_device),
src_device->devid,
rcu_str_deref(tgt_device->name), scrub_ret);
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
mutex_unlock(&fs_info->chunk_mutex);
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
btrfs_rm_dev_replace_blocked(fs_info);
@ -671,8 +671,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list);
fs_info->fs_devices->rw_devices++;
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
btrfs_rm_dev_replace_blocked(fs_info);
btrfs_rm_dev_replace_remove_srcdev(src_device);
@ -769,7 +768,7 @@ void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
{
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
btrfs_dev_replace_read_lock(dev_replace);
down_read(&dev_replace->rwsem);
/* even if !dev_replace_is_valid, the values are good enough for
* the replace_status ioctl */
args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR;
@ -781,7 +780,7 @@ void btrfs_dev_replace_status(struct btrfs_fs_info *fs_info,
args->status.num_uncorrectable_read_errors =
atomic64_read(&dev_replace->num_uncorrectable_read_errors);
args->status.progress_1000 = btrfs_dev_replace_progress(fs_info);
btrfs_dev_replace_read_unlock(dev_replace);
up_read(&dev_replace->rwsem);
}
int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
@ -798,18 +797,18 @@ int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
return -EROFS;
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
switch (dev_replace->replace_state) {
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
break;
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
tgt_device = dev_replace->tgtdev;
src_device = dev_replace->srcdev;
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
ret = btrfs_scrub_cancel(fs_info);
if (ret < 0) {
result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NOT_STARTED;
@ -840,7 +839,7 @@ int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info)
dev_replace->time_stopped = ktime_get_real_seconds();
dev_replace->item_needs_writeback = 1;
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
/* Scrub for replace must not be running in suspended state */
ret = btrfs_scrub_cancel(fs_info);
@ -875,7 +874,8 @@ void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
mutex_lock(&dev_replace->lock_finishing_cancel_unmount);
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
switch (dev_replace->replace_state) {
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
@ -891,7 +891,7 @@ void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info)
break;
}
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
mutex_unlock(&dev_replace->lock_finishing_cancel_unmount);
}
@ -901,12 +901,13 @@ int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
struct task_struct *task;
struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
switch (dev_replace->replace_state) {
case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED:
case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED:
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
return 0;
case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED:
break;
@ -922,10 +923,10 @@ int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
"you may cancel the operation after 'mount -o degraded'");
dev_replace->replace_state =
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
return 0;
}
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
/*
* This could collide with a paused balance, but the exclusive op logic
@ -933,10 +934,10 @@ int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info)
* dev-replace to start anyway.
*/
if (test_and_set_bit(BTRFS_FS_EXCL_OP, &fs_info->flags)) {
btrfs_dev_replace_write_lock(dev_replace);
down_write(&dev_replace->rwsem);
dev_replace->replace_state =
BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED;
btrfs_dev_replace_write_unlock(dev_replace);
up_write(&dev_replace->rwsem);
btrfs_info(fs_info,
"cannot resume dev-replace, other exclusive operation running");
return 0;
@ -1000,26 +1001,6 @@ int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace)
return 1;
}
void btrfs_dev_replace_read_lock(struct btrfs_dev_replace *dev_replace)
{
down_read(&dev_replace->rwsem);
}
void btrfs_dev_replace_read_unlock(struct btrfs_dev_replace *dev_replace)
{
up_read(&dev_replace->rwsem);
}
void btrfs_dev_replace_write_lock(struct btrfs_dev_replace *dev_replace)
{
down_write(&dev_replace->rwsem);
}
void btrfs_dev_replace_write_unlock(struct btrfs_dev_replace *dev_replace)
{
up_write(&dev_replace->rwsem);
}
void btrfs_bio_counter_inc_noblocked(struct btrfs_fs_info *fs_info)
{
percpu_counter_inc(&fs_info->dev_replace.bio_counter);

4
fs/btrfs/dev-replace.h
View File

@ -19,9 +19,5 @@ int btrfs_dev_replace_cancel(struct btrfs_fs_info *fs_info);
void btrfs_dev_replace_suspend_for_unmount(struct btrfs_fs_info *fs_info);
int btrfs_resume_dev_replace_async(struct btrfs_fs_info *fs_info);
int btrfs_dev_replace_is_ongoing(struct btrfs_dev_replace *dev_replace);
void btrfs_dev_replace_read_lock(struct btrfs_dev_replace *dev_replace);
void btrfs_dev_replace_read_unlock(struct btrfs_dev_replace *dev_replace);
void btrfs_dev_replace_write_lock(struct btrfs_dev_replace *dev_replace);
void btrfs_dev_replace_write_unlock(struct btrfs_dev_replace *dev_replace);
#endif

12
fs/btrfs/reada.c
View File

@ -377,10 +377,10 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
}
/* Insert extent in reada tree + all per-device trees, all or nothing */
btrfs_dev_replace_read_lock(&fs_info->dev_replace);
down_read(&fs_info->dev_replace.rwsem);
ret = radix_tree_preload(GFP_KERNEL);
if (ret) {
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
up_read(&fs_info->dev_replace.rwsem);
goto error;
}
@ -391,13 +391,13 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
re_exist->refcnt++;
spin_unlock(&fs_info->reada_lock);
radix_tree_preload_end();
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
up_read(&fs_info->dev_replace.rwsem);
goto error;
}
if (ret) {
spin_unlock(&fs_info->reada_lock);
radix_tree_preload_end();
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
up_read(&fs_info->dev_replace.rwsem);
goto error;
}
radix_tree_preload_end();
@ -439,13 +439,13 @@ static struct reada_extent *reada_find_extent(struct btrfs_fs_info *fs_info,
}
radix_tree_delete(&fs_info->reada_tree, index);
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
up_read(&fs_info->dev_replace.rwsem);
goto error;
}
have_zone = 1;
}
spin_unlock(&fs_info->reada_lock);
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
up_read(&fs_info->dev_replace.rwsem);
if (!have_zone)
goto error;

15
fs/btrfs/scrub.c
View File

@ -3617,11 +3617,12 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
break;
}
btrfs_dev_replace_write_lock(&fs_info->dev_replace);
down_write(&fs_info->dev_replace.rwsem);
dev_replace->cursor_right = found_key.offset + length;
dev_replace->cursor_left = found_key.offset;
dev_replace->item_needs_writeback = 1;
btrfs_dev_replace_write_unlock(&fs_info->dev_replace);
up_write(&dev_replace->rwsem);
ret = scrub_chunk(sctx, scrub_dev, chunk_offset, length,
found_key.offset, cache);
@ -3657,10 +3658,10 @@ int scrub_enumerate_chunks(struct scrub_ctx *sctx,
scrub_pause_off(fs_info);
btrfs_dev_replace_write_lock(&fs_info->dev_replace);
down_write(&fs_info->dev_replace.rwsem);
dev_replace->cursor_left = dev_replace->cursor_right;
dev_replace->item_needs_writeback = 1;
btrfs_dev_replace_write_unlock(&fs_info->dev_replace);
up_write(&fs_info->dev_replace.rwsem);
if (ro_set)
btrfs_dec_block_group_ro(cache);
@ -3860,16 +3861,16 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64 devid, u64 start,
return -EIO;
}
btrfs_dev_replace_read_lock(&fs_info->dev_replace);
down_read(&fs_info->dev_replace.rwsem);
if (dev->scrub_ctx ||
(!is_dev_replace &&
btrfs_dev_replace_is_ongoing(&fs_info->dev_replace))) {
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
up_read(&fs_info->dev_replace.rwsem);
mutex_unlock(&fs_info->scrub_lock);
mutex_unlock(&fs_info->fs_devices->device_list_mutex);
return -EINPROGRESS;
}
btrfs_dev_replace_read_unlock(&fs_info->dev_replace);
up_read(&fs_info->dev_replace.rwsem);
ret = scrub_workers_get(fs_info, is_dev_replace);
if (ret) {

14
fs/btrfs/volumes.c
View File

@ -2106,12 +2106,12 @@ static u64 btrfs_num_devices(struct btrfs_fs_info *fs_info)
{
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;
}
@ -5559,11 +5559,11 @@ int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
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;
}
@ -6143,14 +6143,14 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
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);
up_read(&dev_replace->rwsem);
if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
!need_full_stripe(op) && dev_replace->tgtdev != NULL) {
@ -6347,7 +6347,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
if (dev_replace_is_ongoing) {
lockdep_assert_held(&dev_replace->rwsem);
/* Unlock and let waiting writers proceed */
btrfs_dev_replace_read_unlock(dev_replace);
up_read(&dev_replace->rwsem);
}
free_extent_map(em);
return ret;