diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 4b89680a192338c7a70a4c909e3c4374abe41284..c4661db2b72ae4c412adaaecb7cbc236fbe1e7cf 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -10480,11 +10480,15 @@ void btrfs_delete_unused_bgs(struct btrfs_fs_info *fs_info)
* until transaction commit to do the actual discard.
*/
if (trimming) {
- WARN_ON(!list_empty(&block_group->bg_list));
- spin_lock(&trans->transaction->deleted_bgs_lock);
+ spin_lock(&fs_info->unused_bgs_lock);
+ /*
+ * A concurrent scrub might have added us to the list
+ * fs_info->unused_bgs, so use a list_move operation
+ * to add the block group to the deleted_bgs list.
+ */
list_move(&block_group->bg_list,
&trans->transaction->deleted_bgs);
- spin_unlock(&trans->transaction->deleted_bgs_lock);
+ spin_unlock(&fs_info->unused_bgs_lock);
btrfs_get_block_group(block_group);
}
end_trans:
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 72e73461c0643bbf128504c93a9c47dd377784aa..0f09526aa7d9d2017bb229eb4310f777c4b3b578 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1291,7 +1291,8 @@ int btrfs_mark_extent_written(struct btrfs_trans_handle *trans,
* on error we return an unlocked page and the error value
* on success we return a locked page and 0
*/
-static int prepare_uptodate_page(struct page *page, u64 pos,
+static int prepare_uptodate_page(struct inode *inode,
+ struct page *page, u64 pos,
bool force_uptodate)
{
int ret = 0;
@@ -1306,6 +1307,10 @@ static int prepare_uptodate_page(struct page *page, u64 pos,
unlock_page(page);
return -EIO;
}
+ if (page->mapping != inode->i_mapping) {
+ unlock_page(page);
+ return -EAGAIN;
+ }
}
return 0;
}
@@ -1324,6 +1329,7 @@ static noinline int prepare_pages(struct inode *inode, struct page **pages,
int faili;
for (i = 0; i < num_pages; i++) {
+again:
pages[i] = find_or_create_page(inode->i_mapping, index + i,
mask | __GFP_WRITE);
if (!pages[i]) {
@@ -1333,13 +1339,17 @@ static noinline int prepare_pages(struct inode *inode, struct page **pages,
}
if (i == 0)
- err = prepare_uptodate_page(pages[i], pos,
+ err = prepare_uptodate_page(inode, pages[i], pos,
force_uptodate);
- if (i == num_pages - 1)
- err = prepare_uptodate_page(pages[i],
+ if (!err && i == num_pages - 1)
+ err = prepare_uptodate_page(inode, pages[i],
pos + write_bytes, false);
if (err) {
page_cache_release(pages[i]);
+ if (err == -EAGAIN) {
+ err = 0;
+ goto again;
+ }
faili = i - 1;
goto fail;
}
diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c
index 85a1f8621b51f09f0893abae9ffab90382efdcfc..cfe99bec49dedd723e2a7fff04ace299be37ef87 100644
--- a/fs/btrfs/free-space-cache.c
+++ b/fs/btrfs/free-space-cache.c
@@ -891,7 +891,7 @@ int load_free_space_cache(struct btrfs_fs_info *fs_info,
spin_unlock(&block_group->lock);
ret = 0;
- btrfs_warn(fs_info, "failed to load free space cache for block group %llu, rebuild it now",
+ btrfs_warn(fs_info, "failed to load free space cache for block group %llu, rebuilding it now",
block_group->key.objectid);
}
@@ -2972,7 +2972,7 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
u64 cont1_bytes, u64 min_bytes)
{
struct btrfs_free_space_ctl *ctl = block_group->free_space_ctl;
- struct btrfs_free_space *entry;
+ struct btrfs_free_space *entry = NULL;
int ret = -ENOSPC;
u64 bitmap_offset = offset_to_bitmap(ctl, offset);
@@ -2983,8 +2983,10 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
* The bitmap that covers offset won't be in the list unless offset
* is just its start offset.
*/
- entry = list_first_entry(bitmaps, struct btrfs_free_space, list);
- if (entry->offset != bitmap_offset) {
+ if (!list_empty(bitmaps))
+ entry = list_first_entry(bitmaps, struct btrfs_free_space, list);
+
+ if (!entry || entry->offset != bitmap_offset) {
entry = tree_search_offset(ctl, bitmap_offset, 1, 0);
if (entry && list_empty(&entry->list))
list_add(&entry->list, bitmaps);
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 3367a3c6f214f5ca248a79fff36c6404a49fbf4f..be8eae80ff6572608a478610f9c2b16f3bcb1871 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -274,7 +274,6 @@ static noinline int join_transaction(struct btrfs_root *root, unsigned int type)
cur_trans->num_dirty_bgs = 0;
spin_lock_init(&cur_trans->dirty_bgs_lock);
INIT_LIST_HEAD(&cur_trans->deleted_bgs);
- spin_lock_init(&cur_trans->deleted_bgs_lock);
spin_lock_init(&cur_trans->dropped_roots_lock);
list_add_tail(&cur_trans->list, &fs_info->trans_list);
extent_io_tree_init(&cur_trans->dirty_pages,
diff --git a/fs/btrfs/transaction.h b/fs/btrfs/transaction.h
index 0da21ca9b3fb312a7ec77b4e8314a9e4b3410075..64c8221b6165bb7a6b786ac74e1833f2b93a197b 100644
--- a/fs/btrfs/transaction.h
+++ b/fs/btrfs/transaction.h
@@ -77,8 +77,8 @@ struct btrfs_transaction {
*/
struct mutex cache_write_mutex;
spinlock_t dirty_bgs_lock;
+ /* Protected by spin lock fs_info->unused_bgs_lock. */
struct list_head deleted_bgs;
- spinlock_t deleted_bgs_lock;
spinlock_t dropped_roots_lock;
struct btrfs_delayed_ref_root delayed_refs;
int aborted;
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 45645220660996773b1f76cd1d526d4aeae33dac..a23399e8e3aba2f63d4c0cee90932d073d3bd113 100644
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -3548,12 +3548,11 @@ static int __btrfs_balance(struct btrfs_fs_info *fs_info)
ret = btrfs_force_chunk_alloc(trans, chunk_root,
BTRFS_BLOCK_GROUP_DATA);
+ btrfs_end_transaction(trans, chunk_root);
if (ret < 0) {
mutex_unlock(&fs_info->delete_unused_bgs_mutex);
goto error;
}
-
- btrfs_end_transaction(trans, chunk_root);
chunk_reserved = 1;
}