diff options
| author | Chris Mason <chris.mason@oracle.com> | 2011-11-01 10:08:06 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@oracle.com> | 2011-11-06 03:03:48 -0500 |
| commit | 01d658f2ca3c85c1ffb20b306e30d16197000ce7 (patch) | |
| tree | eda62586bb95967a4001f8fb70e6955b531cf801 | |
| parent | e688b7252f784c2479d559f9f70ca8354752c5e7 (diff) | |
| download | linux-rt-01d658f2ca3c85c1ffb20b306e30d16197000ce7.tar.gz | |
Btrfs: make sure to flush queued bios if write_cache_pages waits
write_cache_pages tries to build up a large bio to stuff down the pipe.
But if it needs to wait for a page lock, it needs to make sure and send
down any pending writes so we don't deadlock with anyone who has the
page lock and is waiting for writeback of things inside the bio.
Dave Sterba triggered this as a deadlock between the autodefrag code and
the extent write_cache_pages
Signed-off-by: Chris Mason <chris.mason@oracle.com>
| -rw-r--r-- | fs/btrfs/disk-io.c | 13 | ||||
| -rw-r--r-- | fs/btrfs/disk-io.h | 2 | ||||
| -rw-r--r-- | fs/btrfs/extent_io.c | 14 | ||||
| -rw-r--r-- | fs/btrfs/extent_io.h | 3 |
4 files changed, 22 insertions, 10 deletions
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 51372a52116703..6f58911ece0d9b 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2735,7 +2735,8 @@ int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) return ret; } -int btree_lock_page_hook(struct page *page) +static int btree_lock_page_hook(struct page *page, void *data, + void (*flush_fn)(void *)) { struct inode *inode = page->mapping->host; struct btrfs_root *root = BTRFS_I(inode)->root; @@ -2752,7 +2753,10 @@ int btree_lock_page_hook(struct page *page) if (!eb) goto out; - btrfs_tree_lock(eb); + if (!btrfs_try_tree_write_lock(eb)) { + flush_fn(data); + btrfs_tree_lock(eb); + } btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { @@ -2767,7 +2771,10 @@ int btree_lock_page_hook(struct page *page) btrfs_tree_unlock(eb); free_extent_buffer(eb); out: - lock_page(page); + if (!trylock_page(page)) { + flush_fn(data); + lock_page(page); + } return 0; } diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h index bec3ea4bd67fd4..e678539c8519cf 100644 --- a/fs/btrfs/disk-io.h +++ b/fs/btrfs/disk-io.h @@ -83,8 +83,6 @@ int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, struct btrfs_fs_info *fs_info); int btrfs_add_log_tree(struct btrfs_trans_handle *trans, struct btrfs_root *root); -int btree_lock_page_hook(struct page *page); - #ifdef CONFIG_DEBUG_LOCK_ALLOC void btrfs_init_lockdep(void); diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index f284d4e5f447e1..b40ba75f4483d2 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2613,10 +2613,16 @@ retry: * swizzled back from swapper_space to tmpfs file * mapping */ - if (tree->ops && tree->ops->write_cache_pages_lock_hook) - tree->ops->write_cache_pages_lock_hook(page); - else - lock_page(page); + if (tree->ops && + tree->ops->write_cache_pages_lock_hook) { + tree->ops->write_cache_pages_lock_hook(page, + data, flush_fn); + } else { + if (!trylock_page(page)) { + flush_fn(data); + lock_page(page); + } + } if (unlikely(page->mapping != mapping)) { unlock_page(page); diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index 325a346369da04..cbd4824a7c9429 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -86,7 +86,8 @@ struct extent_io_ops { struct extent_state *other); void (*split_extent_hook)(struct inode *inode, struct extent_state *orig, u64 split); - int (*write_cache_pages_lock_hook)(struct page *page); + int (*write_cache_pages_lock_hook)(struct page *page, void *data, + void (*flush_fn)(void *)); }; struct extent_io_tree { |