From: Lukas Czerner Date: Mon, 15 Jun 2015 04:23:53 +0000 (-0400) Subject: ext4: wait for existing dio workers in ext4_alloc_file_blocks() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0d306dcf86e8f065dff42a4a934ae9d99af35ba5;p=linux-beck.git ext4: wait for existing dio workers in ext4_alloc_file_blocks() Currently existing dio workers can jump in and potentially increase extent tree depth while we're allocating blocks in ext4_alloc_file_blocks(). This may cause us to underestimate the number of credits needed for the transaction because the extent tree depth can change after our estimation. Fix this by waiting for all the existing dio workers in the same way as we do it in ext4_punch_hole. We've seen errors caused by this in xfstest generic/299, however it's really hard to reproduce. Signed-off-by: Lukas Czerner Signed-off-by: Theodore Ts'o --- diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index fc76bda13852..1ba8b4ab03a8 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4678,6 +4678,10 @@ static int ext4_alloc_file_blocks(struct file *file, ext4_lblk_t offset, if (len <= EXT_UNWRITTEN_MAX_LEN) flags |= EXT4_GET_BLOCKS_NO_NORMALIZE; + /* Wait all existing dio workers, newcomers will block on i_mutex */ + ext4_inode_block_unlocked_dio(inode); + inode_dio_wait(inode); + /* * credits to insert 1 extent into extent tree */ @@ -4741,6 +4745,8 @@ retry: goto retry; } + ext4_inode_resume_unlocked_dio(inode); + return ret > 0 ? ret2 : ret; }