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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /fs/btrfs/volumes.c
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'fs/btrfs/volumes.c')
-rw-r--r--fs/btrfs/volumes.c254
1 files changed, 213 insertions, 41 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 174f5e1e0..fbe7c1045 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -52,6 +52,10 @@ static void btrfs_dev_stat_print_on_load(struct btrfs_device *device);
DEFINE_MUTEX(uuid_mutex);
static LIST_HEAD(fs_uuids);
+struct list_head *btrfs_get_fs_uuids(void)
+{
+ return &fs_uuids;
+}
static struct btrfs_fs_devices *__alloc_fs_devices(void)
{
@@ -345,7 +349,7 @@ loop_lock:
waitqueue_active(&fs_info->async_submit_wait))
wake_up(&fs_info->async_submit_wait);
- BUG_ON(atomic_read(&cur->bi_cnt) == 0);
+ BUG_ON(atomic_read(&cur->__bi_cnt) == 0);
/*
* if we're doing the sync list, record that our
@@ -441,6 +445,61 @@ static void pending_bios_fn(struct btrfs_work *work)
run_scheduled_bios(device);
}
+
+void btrfs_free_stale_device(struct btrfs_device *cur_dev)
+{
+ struct btrfs_fs_devices *fs_devs;
+ struct btrfs_device *dev;
+
+ if (!cur_dev->name)
+ return;
+
+ list_for_each_entry(fs_devs, &fs_uuids, list) {
+ int del = 1;
+
+ if (fs_devs->opened)
+ continue;
+ if (fs_devs->seeding)
+ continue;
+
+ list_for_each_entry(dev, &fs_devs->devices, dev_list) {
+
+ if (dev == cur_dev)
+ continue;
+ if (!dev->name)
+ continue;
+
+ /*
+ * Todo: This won't be enough. What if the same device
+ * comes back (with new uuid and) with its mapper path?
+ * But for now, this does help as mostly an admin will
+ * either use mapper or non mapper path throughout.
+ */
+ rcu_read_lock();
+ del = strcmp(rcu_str_deref(dev->name),
+ rcu_str_deref(cur_dev->name));
+ rcu_read_unlock();
+ if (!del)
+ break;
+ }
+
+ if (!del) {
+ /* delete the stale device */
+ if (fs_devs->num_devices == 1) {
+ btrfs_sysfs_remove_fsid(fs_devs);
+ list_del(&fs_devs->list);
+ free_fs_devices(fs_devs);
+ } else {
+ fs_devs->num_devices--;
+ list_del(&dev->dev_list);
+ rcu_string_free(dev->name);
+ kfree(dev);
+ }
+ break;
+ }
+ }
+}
+
/*
* Add new device to list of registered devices
*
@@ -556,6 +615,12 @@ static noinline int device_list_add(const char *path,
if (!fs_devices->opened)
device->generation = found_transid;
+ /*
+ * if there is new btrfs on an already registered device,
+ * then remove the stale device entry.
+ */
+ btrfs_free_stale_device(device);
+
*fs_devices_ret = fs_devices;
return ret;
@@ -693,13 +758,13 @@ static void free_device(struct rcu_head *head)
static int __btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
{
- struct btrfs_device *device;
+ struct btrfs_device *device, *tmp;
if (--fs_devices->opened > 0)
return 0;
mutex_lock(&fs_devices->device_list_mutex);
- list_for_each_entry(device, &fs_devices->devices, dev_list) {
+ list_for_each_entry_safe(device, tmp, &fs_devices->devices, dev_list) {
struct btrfs_device *new_device;
struct rcu_string *name;
@@ -1067,15 +1132,31 @@ again:
map = (struct map_lookup *)em->bdev;
for (i = 0; i < map->num_stripes; i++) {
+ u64 end;
+
if (map->stripes[i].dev != device)
continue;
if (map->stripes[i].physical >= physical_start + len ||
map->stripes[i].physical + em->orig_block_len <=
physical_start)
continue;
- *start = map->stripes[i].physical +
- em->orig_block_len;
- ret = 1;
+ /*
+ * Make sure that while processing the pinned list we do
+ * not override our *start with a lower value, because
+ * we can have pinned chunks that fall within this
+ * device hole and that have lower physical addresses
+ * than the pending chunks we processed before. If we
+ * do not take this special care we can end up getting
+ * 2 pending chunks that start at the same physical
+ * device offsets because the end offset of a pinned
+ * chunk can be equal to the start offset of some
+ * pending chunk.
+ */
+ end = map->stripes[i].physical + em->orig_block_len;
+ if (end > *start) {
+ *start = end;
+ ret = 1;
+ }
}
}
if (search_list == &trans->transaction->pending_chunks) {
@@ -1706,7 +1787,7 @@ int btrfs_rm_device(struct btrfs_root *root, char *device_path)
if (device->bdev) {
device->fs_devices->open_devices--;
/* remove sysfs entry */
- btrfs_kobj_rm_device(root->fs_info, device);
+ btrfs_kobj_rm_device(root->fs_info->fs_devices, device);
}
call_rcu(&device->rcu, free_device);
@@ -1875,6 +1956,9 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
mutex_lock(&uuid_mutex);
WARN_ON(!tgtdev);
mutex_lock(&fs_info->fs_devices->device_list_mutex);
+
+ btrfs_kobj_rm_device(fs_info->fs_devices, tgtdev);
+
if (tgtdev->bdev) {
btrfs_scratch_superblock(tgtdev);
fs_info->fs_devices->open_devices--;
@@ -2211,7 +2295,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
tmp + 1);
/* add sysfs device entry */
- btrfs_kobj_add_device(root->fs_info, device);
+ btrfs_kobj_add_device(root->fs_info->fs_devices, device);
/*
* we've got more storage, clear any full flags on the space
@@ -2252,8 +2336,9 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
*/
snprintf(fsid_buf, BTRFS_UUID_UNPARSED_SIZE, "%pU",
root->fs_info->fsid);
- if (kobject_rename(&root->fs_info->super_kobj, fsid_buf))
- goto error_trans;
+ if (kobject_rename(&root->fs_info->fs_devices->super_kobj,
+ fsid_buf))
+ pr_warn("BTRFS: sysfs: failed to create fsid for sprout\n");
}
root->fs_info->num_tolerated_disk_barrier_failures =
@@ -2289,7 +2374,7 @@ int btrfs_init_new_device(struct btrfs_root *root, char *device_path)
error_trans:
btrfs_end_transaction(trans, root);
rcu_string_free(device->name);
- btrfs_kobj_rm_device(root->fs_info, device);
+ btrfs_kobj_rm_device(root->fs_info->fs_devices, device);
kfree(device);
error:
blkdev_put(bdev, FMODE_EXCL);
@@ -2609,6 +2694,9 @@ int btrfs_remove_chunk(struct btrfs_trans_handle *trans,
return -EINVAL;
}
map = (struct map_lookup *)em->bdev;
+ lock_chunks(root->fs_info->chunk_root);
+ check_system_chunk(trans, extent_root, map->type);
+ unlock_chunks(root->fs_info->chunk_root);
for (i = 0; i < map->num_stripes; i++) {
struct btrfs_device *device = map->stripes[i].dev;
@@ -2678,6 +2766,20 @@ static int btrfs_relocate_chunk(struct btrfs_root *root,
root = root->fs_info->chunk_root;
extent_root = root->fs_info->extent_root;
+ /*
+ * Prevent races with automatic removal of unused block groups.
+ * After we relocate and before we remove the chunk with offset
+ * chunk_offset, automatic removal of the block group can kick in,
+ * resulting in a failure when calling btrfs_remove_chunk() below.
+ *
+ * Make sure to acquire this mutex before doing a tree search (dev
+ * or chunk trees) to find chunks. Otherwise the cleaner kthread might
+ * call btrfs_remove_chunk() (through btrfs_delete_unused_bgs()) after
+ * we release the path used to search the chunk/dev tree and before
+ * the current task acquires this mutex and calls us.
+ */
+ ASSERT(mutex_is_locked(&root->fs_info->delete_unused_bgs_mutex));
+
ret = btrfs_can_relocate(extent_root, chunk_offset);
if (ret)
return -ENOSPC;
@@ -2726,13 +2828,18 @@ again:
key.type = BTRFS_CHUNK_ITEM_KEY;
while (1) {
+ mutex_lock(&root->fs_info->delete_unused_bgs_mutex);
ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
- if (ret < 0)
+ if (ret < 0) {
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
goto error;
+ }
BUG_ON(ret == 0); /* Corruption */
ret = btrfs_previous_item(chunk_root, path, key.objectid,
key.type);
+ if (ret)
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
if (ret < 0)
goto error;
if (ret > 0)
@@ -2755,6 +2862,7 @@ again:
else
BUG_ON(ret);
}
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
if (found_key.offset == 0)
break;
@@ -3211,9 +3319,12 @@ again:
goto error;
}
+ mutex_lock(&fs_info->delete_unused_bgs_mutex);
ret = btrfs_search_slot(NULL, chunk_root, &key, path, 0, 0);
- if (ret < 0)
+ if (ret < 0) {
+ mutex_unlock(&fs_info->delete_unused_bgs_mutex);
goto error;
+ }
/*
* this shouldn't happen, it means the last relocate
@@ -3225,6 +3336,7 @@ again:
ret = btrfs_previous_item(chunk_root, path, 0,
BTRFS_CHUNK_ITEM_KEY);
if (ret) {
+ mutex_unlock(&fs_info->delete_unused_bgs_mutex);
ret = 0;
break;
}
@@ -3233,8 +3345,10 @@ again:
slot = path->slots[0];
btrfs_item_key_to_cpu(leaf, &found_key, slot);
- if (found_key.objectid != key.objectid)
+ if (found_key.objectid != key.objectid) {
+ mutex_unlock(&fs_info->delete_unused_bgs_mutex);
break;
+ }
chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
@@ -3247,10 +3361,13 @@ again:
ret = should_balance_chunk(chunk_root, leaf, chunk,
found_key.offset);
btrfs_release_path(path);
- if (!ret)
+ if (!ret) {
+ mutex_unlock(&fs_info->delete_unused_bgs_mutex);
goto loop;
+ }
if (counting) {
+ mutex_unlock(&fs_info->delete_unused_bgs_mutex);
spin_lock(&fs_info->balance_lock);
bctl->stat.expected++;
spin_unlock(&fs_info->balance_lock);
@@ -3260,6 +3377,7 @@ again:
ret = btrfs_relocate_chunk(chunk_root,
found_key.objectid,
found_key.offset);
+ mutex_unlock(&fs_info->delete_unused_bgs_mutex);
if (ret && ret != -ENOSPC)
goto error;
if (ret == -ENOSPC) {
@@ -3908,9 +4026,9 @@ int btrfs_create_uuid_tree(struct btrfs_fs_info *fs_info)
uuid_root = btrfs_create_tree(trans, fs_info,
BTRFS_UUID_TREE_OBJECTID);
if (IS_ERR(uuid_root)) {
- btrfs_abort_transaction(trans, tree_root,
- PTR_ERR(uuid_root));
- return PTR_ERR(uuid_root);
+ ret = PTR_ERR(uuid_root);
+ btrfs_abort_transaction(trans, tree_root, ret);
+ return ret;
}
fs_info->uuid_root = uuid_root;
@@ -3965,6 +4083,7 @@ int btrfs_shrink_device(struct btrfs_device *device, u64 new_size)
int slot;
int failed = 0;
bool retried = false;
+ bool checked_pending_chunks = false;
struct extent_buffer *l;
struct btrfs_key key;
struct btrfs_super_block *super_copy = root->fs_info->super_copy;
@@ -3998,11 +4117,16 @@ again:
key.type = BTRFS_DEV_EXTENT_KEY;
do {
+ mutex_lock(&root->fs_info->delete_unused_bgs_mutex);
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
- if (ret < 0)
+ if (ret < 0) {
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
goto done;
+ }
ret = btrfs_previous_item(root, path, 0, key.type);
+ if (ret)
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
if (ret < 0)
goto done;
if (ret) {
@@ -4016,6 +4140,7 @@ again:
btrfs_item_key_to_cpu(l, &key, path->slots[0]);
if (key.objectid != device->devid) {
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
btrfs_release_path(path);
break;
}
@@ -4024,6 +4149,7 @@ again:
length = btrfs_dev_extent_length(l, dev_extent);
if (key.offset + length <= new_size) {
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
btrfs_release_path(path);
break;
}
@@ -4033,6 +4159,7 @@ again:
btrfs_release_path(path);
ret = btrfs_relocate_chunk(root, chunk_objectid, chunk_offset);
+ mutex_unlock(&root->fs_info->delete_unused_bgs_mutex);
if (ret && ret != -ENOSPC)
goto done;
if (ret == -ENOSPC)
@@ -4045,15 +4172,6 @@ again:
goto again;
} else if (failed && retried) {
ret = -ENOSPC;
- lock_chunks(root);
-
- btrfs_device_set_total_bytes(device, old_size);
- if (device->writeable)
- device->fs_devices->total_rw_bytes += diff;
- spin_lock(&root->fs_info->free_chunk_lock);
- root->fs_info->free_chunk_space += diff;
- spin_unlock(&root->fs_info->free_chunk_lock);
- unlock_chunks(root);
goto done;
}
@@ -4065,6 +4183,35 @@ again:
}
lock_chunks(root);
+
+ /*
+ * We checked in the above loop all device extents that were already in
+ * the device tree. However before we have updated the device's
+ * total_bytes to the new size, we might have had chunk allocations that
+ * have not complete yet (new block groups attached to transaction
+ * handles), and therefore their device extents were not yet in the
+ * device tree and we missed them in the loop above. So if we have any
+ * pending chunk using a device extent that overlaps the device range
+ * that we can not use anymore, commit the current transaction and
+ * repeat the search on the device tree - this way we guarantee we will
+ * not have chunks using device extents that end beyond 'new_size'.
+ */
+ if (!checked_pending_chunks) {
+ u64 start = new_size;
+ u64 len = old_size - new_size;
+
+ if (contains_pending_extent(trans, device, &start, len)) {
+ unlock_chunks(root);
+ checked_pending_chunks = true;
+ failed = 0;
+ retried = false;
+ ret = btrfs_commit_transaction(trans, root);
+ if (ret)
+ goto done;
+ goto again;
+ }
+ }
+
btrfs_device_set_disk_total_bytes(device, new_size);
if (list_empty(&device->resized_list))
list_add_tail(&device->resized_list,
@@ -4079,6 +4226,16 @@ again:
btrfs_end_transaction(trans, root);
done:
btrfs_free_path(path);
+ if (ret) {
+ lock_chunks(root);
+ btrfs_device_set_total_bytes(device, old_size);
+ if (device->writeable)
+ device->fs_devices->total_rw_bytes += diff;
+ spin_lock(&root->fs_info->free_chunk_lock);
+ root->fs_info->free_chunk_space += diff;
+ spin_unlock(&root->fs_info->free_chunk_lock);
+ unlock_chunks(root);
+ }
return ret;
}
@@ -5586,17 +5743,16 @@ int btrfs_rmap_block(struct btrfs_mapping_tree *map_tree,
static inline void btrfs_end_bbio(struct btrfs_bio *bbio, struct bio *bio, int err)
{
- if (likely(bbio->flags & BTRFS_BIO_ORIG_BIO_SUBMITTED))
- bio_endio_nodec(bio, err);
- else
- bio_endio(bio, err);
+ bio->bi_private = bbio->private;
+ bio->bi_end_io = bbio->end_io;
+ bio_endio(bio, err);
+
btrfs_put_bbio(bbio);
}
static void btrfs_end_bio(struct bio *bio, int err)
{
struct btrfs_bio *bbio = bio->bi_private;
- struct btrfs_device *dev = bbio->stripes[0].dev;
int is_orig_bio = 0;
if (err) {
@@ -5604,6 +5760,7 @@ static void btrfs_end_bio(struct bio *bio, int err)
if (err == -EIO || err == -EREMOTEIO) {
unsigned int stripe_index =
btrfs_io_bio(bio)->stripe_index;
+ struct btrfs_device *dev;
BUG_ON(stripe_index >= bbio->num_stripes);
dev = bbio->stripes[stripe_index].dev;
@@ -5633,8 +5790,6 @@ static void btrfs_end_bio(struct bio *bio, int err)
bio = bbio->orig_bio;
}
- bio->bi_private = bbio->private;
- bio->bi_end_io = bbio->end_io;
btrfs_io_bio(bio)->mirror_num = bbio->mirror_num;
/* only send an error to the higher layers if it is
* beyond the tolerance of the btrfs bio
@@ -5816,8 +5971,6 @@ static void bbio_error(struct btrfs_bio *bbio, struct bio *bio, u64 logical)
/* Shoud be the original bio. */
WARN_ON(bio != bbio->orig_bio);
- bio->bi_private = bbio->private;
- bio->bi_end_io = bbio->end_io;
btrfs_io_bio(bio)->mirror_num = bbio->mirror_num;
bio->bi_iter.bi_sector = logical >> 9;
@@ -5898,10 +6051,8 @@ int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
if (dev_nr < total_devs - 1) {
bio = btrfs_bio_clone(first_bio, GFP_NOFS);
BUG_ON(!bio); /* -ENOMEM */
- } else {
+ } else
bio = first_bio;
- bbio->flags |= BTRFS_BIO_ORIG_BIO_SUBMITTED;
- }
submit_stripe_bio(root, bbio, bio,
bbio->stripes[dev_nr].physical, dev_nr, rw,
@@ -6078,6 +6229,8 @@ static int read_one_chunk(struct btrfs_root *root, struct btrfs_key *key,
free_extent_map(em);
return -EIO;
}
+ btrfs_warn(root->fs_info, "devid %llu uuid %pU is missing",
+ devid, uuid);
}
map->stripes[i].dev->in_fs_metadata = 1;
}
@@ -6197,10 +6350,11 @@ static int read_one_dev(struct btrfs_root *root,
if (!btrfs_test_opt(root, DEGRADED))
return -EIO;
- btrfs_warn(root->fs_info, "devid %llu missing", devid);
device = add_missing_dev(root, fs_devices, devid, dev_uuid);
if (!device)
return -ENOMEM;
+ btrfs_warn(root->fs_info, "devid %llu uuid %pU missing",
+ devid, dev_uuid);
} else {
if (!device->bdev && !btrfs_test_opt(root, DEGRADED))
return -EIO;
@@ -6728,3 +6882,21 @@ void btrfs_update_commit_device_bytes_used(struct btrfs_root *root,
}
unlock_chunks(root);
}
+
+void btrfs_set_fs_info_ptr(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ while (fs_devices) {
+ fs_devices->fs_info = fs_info;
+ fs_devices = fs_devices->seed;
+ }
+}
+
+void btrfs_reset_fs_info_ptr(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
+ while (fs_devices) {
+ fs_devices->fs_info = NULL;
+ fs_devices = fs_devices->seed;
+ }
+}