linux/fs/netfs
Xiubo Li fac47b43c7 netfs: do not unlock and put the folio twice
check_write_begin() will unlock and put the folio when return
non-zero.  So we should avoid unlocking and putting it twice in
netfs layer.

Change the way ->check_write_begin() works in the following two ways:

 (1) Pass it a pointer to the folio pointer, allowing it to unlock and put
     the folio prior to doing the stuff it wants to do, provided it clears
     the folio pointer.

 (2) Change the return values such that 0 with folio pointer set means
     continue, 0 with folio pointer cleared means re-get and all error
     codes indicating an error (no special treatment for -EAGAIN).

[ bagasdotme: use Sphinx code text syntax for *foliop pointer ]

Cc: stable@vger.kernel.org
Link: https://tracker.ceph.com/issues/56423
Link: https://lore.kernel.org/r/cf169f43-8ee7-8697-25da-0204d1b4343e@redhat.com
Co-developed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2022-07-14 10:10:12 +02:00
..
buffered_read.c netfs: do not unlock and put the folio twice 2022-07-14 10:10:12 +02:00
internal.h netfs: Fix gcc-12 warning by embedding vfs inode in netfs_i_context 2022-06-09 13:55:00 -07:00
io.c netfs: Split some core bits out into their own file 2022-03-18 09:29:05 +00:00
Kconfig netfs: Make CONFIG_NETFS_SUPPORT auto-selected rather than manual 2021-05-25 13:48:04 +01:00
main.c netfs: Split some core bits out into their own file 2022-03-18 09:29:05 +00:00
Makefile netfs: Split some core bits out into their own file 2022-03-18 09:29:05 +00:00
objects.c netfs: Rename the netfs_io_request cleanup op and give it an op pointer 2022-06-10 20:55:21 +01:00
stats.c netfs: Add a netfs inode context 2022-03-18 09:29:05 +00:00