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Diffstat (limited to 'fs/btrfs/disk-io.c')
-rw-r--r--fs/btrfs/disk-io.c189
1 files changed, 147 insertions, 42 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 102c176fc29..632f8f3cc9d 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -620,7 +620,7 @@ out:
static int btree_io_failed_hook(struct bio *failed_bio,
struct page *page, u64 start, u64 end,
- u64 mirror_num, struct extent_state *state)
+ int mirror_num, struct extent_state *state)
{
struct extent_io_tree *tree;
unsigned long len;
@@ -1890,31 +1890,32 @@ struct btrfs_root *open_ctree(struct super_block *sb,
u64 features;
struct btrfs_key location;
struct buffer_head *bh;
- struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
- struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
+ struct btrfs_super_block *disk_super;
struct btrfs_root *tree_root = btrfs_sb(sb);
- struct btrfs_fs_info *fs_info = NULL;
- struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
- struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root),
- GFP_NOFS);
+ struct btrfs_fs_info *fs_info = tree_root->fs_info;
+ struct btrfs_root *extent_root;
+ struct btrfs_root *csum_root;
+ struct btrfs_root *chunk_root;
+ struct btrfs_root *dev_root;
struct btrfs_root *log_tree_root;
-
int ret;
int err = -EINVAL;
int num_backups_tried = 0;
int backup_index = 0;
- struct btrfs_super_block *disk_super;
+ extent_root = fs_info->extent_root =
+ kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
+ csum_root = fs_info->csum_root =
+ kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
+ chunk_root = fs_info->chunk_root =
+ kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
+ dev_root = fs_info->dev_root =
+ kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
- if (!extent_root || !tree_root || !tree_root->fs_info ||
- !chunk_root || !dev_root || !csum_root) {
+ if (!extent_root || !csum_root || !chunk_root || !dev_root) {
err = -ENOMEM;
goto fail;
}
- fs_info = tree_root->fs_info;
ret = init_srcu_struct(&fs_info->subvol_srcu);
if (ret) {
@@ -1954,12 +1955,6 @@ struct btrfs_root *open_ctree(struct super_block *sb,
mutex_init(&fs_info->reloc_mutex);
init_completion(&fs_info->kobj_unregister);
- fs_info->tree_root = tree_root;
- fs_info->extent_root = extent_root;
- fs_info->csum_root = csum_root;
- fs_info->chunk_root = chunk_root;
- fs_info->dev_root = dev_root;
- fs_info->fs_devices = fs_devices;
INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
INIT_LIST_HEAD(&fs_info->space_info);
btrfs_mapping_init(&fs_info->mapping_tree);
@@ -2465,21 +2460,20 @@ fail_sb_buffer:
btrfs_stop_workers(&fs_info->caching_workers);
fail_alloc:
fail_iput:
+ btrfs_mapping_tree_free(&fs_info->mapping_tree);
+
invalidate_inode_pages2(fs_info->btree_inode->i_mapping);
iput(fs_info->btree_inode);
-
- btrfs_close_devices(fs_info->fs_devices);
- btrfs_mapping_tree_free(&fs_info->mapping_tree);
fail_bdi:
bdi_destroy(&fs_info->bdi);
fail_srcu:
cleanup_srcu_struct(&fs_info->subvol_srcu);
fail:
+ btrfs_close_devices(fs_info->fs_devices);
free_fs_info(fs_info);
return ERR_PTR(err);
recovery_tree_root:
-
if (!btrfs_test_opt(tree_root, RECOVERY))
goto fail_tree_roots;
@@ -2579,22 +2573,10 @@ static int write_dev_supers(struct btrfs_device *device,
int errors = 0;
u32 crc;
u64 bytenr;
- int last_barrier = 0;
if (max_mirrors == 0)
max_mirrors = BTRFS_SUPER_MIRROR_MAX;
- /* make sure only the last submit_bh does a barrier */
- if (do_barriers) {
- for (i = 0; i < max_mirrors; i++) {
- bytenr = btrfs_sb_offset(i);
- if (bytenr + BTRFS_SUPER_INFO_SIZE >=
- device->total_bytes)
- break;
- last_barrier = i;
- }
- }
-
for (i = 0; i < max_mirrors; i++) {
bytenr = btrfs_sb_offset(i);
if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
@@ -2640,17 +2622,136 @@ static int write_dev_supers(struct btrfs_device *device,
bh->b_end_io = btrfs_end_buffer_write_sync;
}
- if (i == last_barrier && do_barriers)
- ret = submit_bh(WRITE_FLUSH_FUA, bh);
- else
- ret = submit_bh(WRITE_SYNC, bh);
-
+ /*
+ * we fua the first super. The others we allow
+ * to go down lazy.
+ */
+ ret = submit_bh(WRITE_FUA, bh);
if (ret)
errors++;
}
return errors < i ? 0 : -1;
}
+/*
+ * endio for the write_dev_flush, this will wake anyone waiting
+ * for the barrier when it is done
+ */
+static void btrfs_end_empty_barrier(struct bio *bio, int err)
+{
+ if (err) {
+ if (err == -EOPNOTSUPP)
+ set_bit(BIO_EOPNOTSUPP, &bio->bi_flags);
+ clear_bit(BIO_UPTODATE, &bio->bi_flags);
+ }
+ if (bio->bi_private)
+ complete(bio->bi_private);
+ bio_put(bio);
+}
+
+/*
+ * trigger flushes for one the devices. If you pass wait == 0, the flushes are
+ * sent down. With wait == 1, it waits for the previous flush.
+ *
+ * any device where the flush fails with eopnotsupp are flagged as not-barrier
+ * capable
+ */
+static int write_dev_flush(struct btrfs_device *device, int wait)
+{
+ struct bio *bio;
+ int ret = 0;
+
+ if (device->nobarriers)
+ return 0;
+
+ if (wait) {
+ bio = device->flush_bio;
+ if (!bio)
+ return 0;
+
+ wait_for_completion(&device->flush_wait);
+
+ if (bio_flagged(bio, BIO_EOPNOTSUPP)) {
+ printk("btrfs: disabling barriers on dev %s\n",
+ device->name);
+ device->nobarriers = 1;
+ }
+ if (!bio_flagged(bio, BIO_UPTODATE)) {
+ ret = -EIO;
+ }
+
+ /* drop the reference from the wait == 0 run */
+ bio_put(bio);
+ device->flush_bio = NULL;
+
+ return ret;
+ }
+
+ /*
+ * one reference for us, and we leave it for the
+ * caller
+ */
+ device->flush_bio = NULL;;
+ bio = bio_alloc(GFP_NOFS, 0);
+ if (!bio)
+ return -ENOMEM;
+
+ bio->bi_end_io = btrfs_end_empty_barrier;
+ bio->bi_bdev = device->bdev;
+ init_completion(&device->flush_wait);
+ bio->bi_private = &device->flush_wait;
+ device->flush_bio = bio;
+
+ bio_get(bio);
+ submit_bio(WRITE_FLUSH, bio);
+
+ return 0;
+}
+
+/*
+ * send an empty flush down to each device in parallel,
+ * then wait for them
+ */
+static int barrier_all_devices(struct btrfs_fs_info *info)
+{
+ struct list_head *head;
+ struct btrfs_device *dev;
+ int errors = 0;
+ int ret;
+
+ /* send down all the barriers */
+ head = &info->fs_devices->devices;
+ list_for_each_entry_rcu(dev, head, dev_list) {
+ if (!dev->bdev) {
+ errors++;
+ continue;
+ }
+ if (!dev->in_fs_metadata || !dev->writeable)
+ continue;
+
+ ret = write_dev_flush(dev, 0);
+ if (ret)
+ errors++;
+ }
+
+ /* wait for all the barriers */
+ list_for_each_entry_rcu(dev, head, dev_list) {
+ if (!dev->bdev) {
+ errors++;
+ continue;
+ }
+ if (!dev->in_fs_metadata || !dev->writeable)
+ continue;
+
+ ret = write_dev_flush(dev, 1);
+ if (ret)
+ errors++;
+ }
+ if (errors)
+ return -EIO;
+ return 0;
+}
+
int write_all_supers(struct btrfs_root *root, int max_mirrors)
{
struct list_head *head;
@@ -2672,6 +2773,10 @@ int write_all_supers(struct btrfs_root *root, int max_mirrors)
mutex_lock(&root->fs_info->fs_devices->device_list_mutex);
head = &root->fs_info->fs_devices->devices;
+
+ if (do_barriers)
+ barrier_all_devices(root->fs_info);
+
list_for_each_entry_rcu(dev, head, dev_list) {
if (!dev->bdev) {
total_errors++;
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 15:11:12 +0000