As Sagi Grimberg suggested, the original fix is refind to a more common
inline routine:
static inline bool sendpage_ok(struct page *page)
{
return (!PageSlab(page) && page_count(page) >= 1);
}
If sendpage_ok() returns true, the checking page can be handled by the
concrete zero-copy sendpage method in network layer.
The v10 series has 7 patches, fixes a WARN_ONCE() usage from v9 series,
- The 1st patch in this series introduces sendpage_ok() in header file
include/linux/net.h.
- The 2nd patch adds WARN_ONCE() for improper zero-copy send in
kernel_sendpage().
- The 3rd patch fixes the page checking issue in nvme-over-tcp driver.
- The 4th patch adds page_count check by using sendpage_ok() in
do_tcp_sendpages() as Eric Dumazet suggested.
- The 5th and 6th patches just replace existing open coded checks with
the inline sendpage_ok() routine.
Coly Li
Cc: Chaitanya Kulkarni <chaitanya.kulka...@wdc.com>
Cc: Chris Leech <cle...@redhat.com>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Cong Wang <amw...@redhat.com>
Cc: David S. Miller <da...@davemloft.net>
Cc: Eric Dumazet <eric.duma...@gmail.com>
Cc: Hannes Reinecke <h...@suse.de>
Cc: Ilya Dryomov <idryo...@gmail.com>
Cc: Jan Kara <j...@suse.com>
Cc: Jeff Layton <jlay...@kernel.org>
Cc: Jens Axboe <ax...@kernel.dk>
Cc: Lee Duncan <ldun...@suse.com>
Cc: Mike Christie <micha...@cs.wisc.edu>
Cc: Mikhail Skorzhinskii <mskorzhins...@solarflare.com>
Cc: Philipp Reisner <philipp.reis...@linbit.com>
Cc: Sagi Grimberg <s...@grimberg.me>
Cc: Vasily Averin <v...@virtuozzo.com>
Cc: Vlastimil Babka <vba...@suse.com>
---
Changelog:
v10, fix WARN_ONCE() usage, and add Reivewed-by tag from Lee Duncan.
v9, fix a typo pointed out by Greg KH.
add Acked-by tags from Martin K. Petersen and Ilya Dryomov.
v8: add WARN_ONCE() in kernel_sendpage() as Christoph suggested.
v7: remove outer brackets from the return line of sendpage_ok() as
Eric Dumazet suggested.
v6: fix page check in do_tcp_sendpages(), as Eric Dumazet suggested.
replace other open coded checks with sendpage_ok() in libceph,
iscsi drivers.
v5, include linux/mm.h in include/linux/net.h
v4, change sendpage_ok() as an inline helper, and post it as
separate patch, as Christoph Hellwig suggested.
v3, introduce a more common sendpage_ok() as Sagi Grimberg suggested.
v2, fix typo in patch subject
v1, the initial version.
Coly Li (7):
net: introduce helper sendpage_ok() in include/linux/net.h
net: add WARN_ONCE in kernel_sendpage() for improper zero-copy send
nvme-tcp: check page by sendpage_ok() before calling kernel_sendpage()
tcp: use sendpage_ok() to detect misused .sendpage
drbd: code cleanup by using sendpage_ok() to check page for
kernel_sendpage()
scsi: libiscsi: use sendpage_ok() in iscsi_tcp_segment_map()
libceph: use sendpage_ok() in ceph_tcp_sendpage()
drivers/block/drbd/drbd_main.c | 2 +-
drivers/nvme/host/tcp.c | 7 +++----
drivers/scsi/libiscsi_tcp.c | 2 +-
include/linux/net.h | 16 ++++++++++++++++
net/ceph/messenger.c | 2 +-
net/ipv4/tcp.c | 3 ++-
net/socket.c | 6 ++++--
7 files changed, 28 insertions(+), 10 deletions(-)
--
2.26.2
