On Thu 12-01-12 12:56:01, Andreas Dilger wrote:

On 2012-01-11, at 6:20 PM, Jan Kara wrote:

quoted

There are three entry points which dirty pages in a filesystem.  mmap (handled
by block_page_mkwrite()), buffered write (handled by
__generic_file_aio_write()), and truncate (it can dirty last partial page -
handled by do_truncate()). Protect these places with sb_start_write() and
sb_end_write().

Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/buffer.c  |   18 ++----------------
fs/open.c    |    6 ++++++
mm/filemap.c |    3 ++-
3 files changed, 10 insertions(+), 17 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 19d8eb7..8519405 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c

@@ -2371,18 +2371,7 @@ int __block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,

The comment for __block_page_mkwrite() needs to be updated to reference
sb_start_write() and sb_end_write() instead of vfs_check_frozen().

  Thanks. Fixed.

								Honza
-- 
Jan Kara [off-list ref]
SUSE Labs, CR