diff options
Diffstat (limited to 'fs/ext4/page-io.c')
| -rw-r--r-- | fs/ext4/page-io.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c index 92f38ee..aed4096 100644 --- a/fs/ext4/page-io.c +++ b/fs/ext4/page-io.c @@ -87,6 +87,9 @@ void ext4_free_io_end(ext4_io_end_t *io) /* * check a range of space and convert unwritten extents to written. + * + * Called with inode->i_mutex; we depend on this when we manipulate + * io->flag, since we could otherwise race with ext4_flush_completed_IO() */ int ext4_end_io_nolock(ext4_io_end_t *io) { @@ -100,9 +103,6 @@ int ext4_end_io_nolock(ext4_io_end_t *io) "list->prev 0x%p\n", io, inode->i_ino, io->list.next, io->list.prev); - if (list_empty(&io->list)) - return ret; - if (!(io->flag & EXT4_IO_END_UNWRITTEN)) return ret; @@ -142,6 +142,13 @@ static void ext4_end_io_work(struct work_struct *work) unsigned long flags; int ret; + spin_lock_irqsave(&ei->i_completed_io_lock, flags); + if (list_empty(&io->list)) { + spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); + goto free; + } + spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); + if (!mutex_trylock(&inode->i_mutex)) { /* * Requeue the work instead of waiting so that the work @@ -170,6 +177,7 @@ static void ext4_end_io_work(struct work_struct *work) list_del_init(&io->list); spin_unlock_irqrestore(&ei->i_completed_io_lock, flags); mutex_unlock(&inode->i_mutex); +free: ext4_free_io_end(io); } |