Commit fc315e3e authored by Linus Torvalds's avatar Linus Torvalds

Merge branch 'for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs

Pull btrfs fixes from Chris Mason:
 "A couple of small fixes"

* 'for-linus-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs:
  Btrfs: check prepare_uptodate_page() error code earlier
  Btrfs: check for empty bitmap list in setup_cluster_bitmaps
  btrfs: fix misleading warning when space cache failed to load
  Btrfs: fix transaction handle leak in balance
  Btrfs: fix unprotected list move from unused_bgs to deleted_bgs list
parents 8b4414f5 1d3a5a82
......@@ -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:
......
......@@ -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;
}
......
......@@ -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.
*/
if (!list_empty(bitmaps))
entry = list_first_entry(bitmaps, struct btrfs_free_space, list);
if (entry->offset != bitmap_offset) {
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);
......
......@@ -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,
......
......@@ -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;
......
......@@ -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;
}
......
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