linux/include
Dave Chinner 0b5649278e writeback: pay attention to wbc->nr_to_write in write_cache_pages
If a filesystem writes more than one page in ->writepage, write_cache_pages
fails to notice this and continues to attempt writeback when wbc->nr_to_write
has gone negative - this trace was captured from XFS:

    wbc_writeback_start: towrt=1024
    wbc_writepage: towrt=1024
    wbc_writepage: towrt=0
    wbc_writepage: towrt=-1
    wbc_writepage: towrt=-5
    wbc_writepage: towrt=-21
    wbc_writepage: towrt=-85

This has adverse effects on filesystem writeback behaviour. write_cache_pages()
needs to terminate after a certain number of pages are written, not after a
certain number of calls to ->writepage are made.  This is a regression
introduced by 17bc6c30cf ("vfs: Add
no_nrwrite_index_update writeback control flag"), but cannot be reverted
directly due to subsequent bug fixes that have gone in on top of it.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-06-08 18:12:44 -07:00
..
acpi
asm-generic Merge branch 'for-35' of git://repo.or.cz/linux-kbuild 2010-06-01 08:55:52 -07:00
crypto
drm Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2010-06-03 07:19:45 -07:00
keys
linux writeback: pay attention to wbc->nr_to_write in write_cache_pages 2010-06-08 18:12:44 -07:00
math-emu
media V4L/DVB: saa7134: add RM-K6 remote control support for Avermedia M135A 2010-06-01 01:22:09 -03:00
mtd
net net: check for refcount if pop a stacked dst_entry 2010-06-04 15:56:00 -07:00
pcmcia
rdma
rxrpc
scsi SCSI: implement sd_unlock_native_capacity() 2010-06-02 13:50:04 -04:00
sound
trace writeback: pay attention to wbc->nr_to_write in write_cache_pages 2010-06-08 18:12:44 -07:00
video
xen
Kbuild