net: make getname() functions return length rather than use int* parameter

Changes since v1:
Added changes in these files:
drivers/infiniband/hw/usnic/usnic_transport.c
d

net: make getname() functions return length rather than use int* parameter

Changes since v1:
Added changes in these files:
drivers/infiniband/hw/usnic/usnic_transport.c
drivers/staging/lustre/lnet/lnet/lib-socket.c
drivers/target/iscsi/iscsi_target_login.c
drivers/vhost/net.c
fs/dlm/lowcomms.c
fs/ocfs2/cluster/tcp.c
security/tomoyo/network.c

Before:
All these functions either return a negative error indicator,
or store length of sockaddr into "int *socklen" parameter
and return zero on success.

"int *socklen" parameter is awkward. For example, if caller does not
care, it still needs to provide on-stack storage for the value
it does not need.

None of the many FOO_getname() functions of various protocols
ever used old value of *socklen. They always just overwrite it.

This change drops this parameter, and makes all these functions, on success,
return length of sockaddr. It's always >= 0 and can be differentiated
from an error.

Tests in callers are changed from "if (err)" to "if (err < 0)", where needed.

rpc_sockname() lost "int buflen" parameter, since its only use was
to be passed to kernel_getsockname() as &buflen and subsequently
not used in any way.

Userspace API is not changed.

text data bss dec hex filename
30108430 2633624 873672 33615726 200ef6e vmlinux.before.o
30108109 2633612 873672 33615393 200ee21 vmlinux.o

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
CC: David S. Miller <davem@davemloft.net>
CC: linux-kernel@vger.kernel.org
CC: netdev@vger.kernel.org
CC: linux-bluetooth@vger.kernel.org
CC: linux-decnet-user@lists.sourceforge.net
CC: linux-wireless@vger.kernel.org
CC: linux-rdma@vger.kernel.org
CC: linux-sctp@vger.kernel.org
CC: linux-nfs@vger.kernel.org
CC: linux-x25@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

dlm: switch to sock_recvmsg()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

DLM: fix NULL pointer dereference in send_to_sock()

The writequeue and writequeue_lock member of othercon was not initialized.
If lowcomms_state_change() is called from network layer, ot

DLM: fix NULL pointer dereference in send_to_sock()

The writequeue and writequeue_lock member of othercon was not initialized.
If lowcomms_state_change() is called from network layer, othercon->swork
may be scheduled. In this case, send_to_sock() will generate a NULL pointer
reference. We avoid this problem by correctly initializing writequeue and
writequeue_lock member of othercon.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: fix to reschedule rwork

When an error occurs in kernel_recvmsg or kernel_sendpage and
close_connection is called and receive work is already scheduled,
receive work is canceled.

DLM: fix to reschedule rwork

When an error occurs in kernel_recvmsg or kernel_sendpage and
close_connection is called and receive work is already scheduled,
receive work is canceled. In that case, the receive work will not
be scheduled forever after reconnection, because CF_READ_PENDING
flag is established.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: fix to use sk_callback_lock correctly

In the current implementation, we think that exclusion control between
processing to set the callback function to the connection structure and

DLM: fix to use sk_callback_lock correctly

In the current implementation, we think that exclusion control between
processing to set the callback function to the connection structure and
processing to refer to the connection structure from the callback function
was not enough. We fix them.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: fix memory leak in tcp_accept_from_sock()

The sk member of the socket generated by sock_create_kern() is overwritten
by ops->accept(). So the previous sk will not be released.
W

DLM: fix memory leak in tcp_accept_from_sock()

The sk member of the socket generated by sock_create_kern() is overwritten
by ops->accept(). So the previous sk will not be released.
We use kernel_accept() instead of sock_create_kern() and ops->accept().

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: use CF_CLOSE flag to stop dlm_send correctly

If reconnection fails while executing dlm_lowcomms_stop,
dlm_send will not stop.

Signed-off-by: Tadashi Miyauchi <miyauchi@tosh

DLM: use CF_CLOSE flag to stop dlm_send correctly

If reconnection fails while executing dlm_lowcomms_stop,
dlm_send will not stop.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: Reanimate CF_WRITE_PENDING flag

CF_WRITE_PENDING flag has been reanimated to make dlm_send stop properly
when running dlm_lowcomms_stop.

Signed-off-by: Tadashi Miyauchi <mi

DLM: Reanimate CF_WRITE_PENDING flag

CF_WRITE_PENDING flag has been reanimated to make dlm_send stop properly
when running dlm_lowcomms_stop.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: close othercon at send/receive error

If an error occurs in the sending / receiving process, if othercon
exists, sending / receiving processing using othercon may also result
in

DLM: close othercon at send/receive error

If an error occurs in the sending / receiving process, if othercon
exists, sending / receiving processing using othercon may also result
in an error. We fix to pre-close othercon as well.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: fix to use sock_mutex correctly in xxx_accept_from_sock

In the current implementation, we think that exclusion control
for othercon in tcp_accept_from_sock() and sctp_accept_from_so

DLM: fix to use sock_mutex correctly in xxx_accept_from_sock

In the current implementation, we think that exclusion control
for othercon in tcp_accept_from_sock() and sctp_accept_from_sock()
was not enough. We fix them.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: fix race condition between dlm_send and dlm_recv

When kernel_sendpage(in send_to_sock) and kernel_recvmsg
(in receive_from_sock) return error, close_connection may works at the

DLM: fix race condition between dlm_send and dlm_recv

When kernel_sendpage(in send_to_sock) and kernel_recvmsg
(in receive_from_sock) return error, close_connection may works at the
same time. At that time, they may wait for each other by cancel_work_sync.

Signed-off-by: Tadashi Miyauchi <miayuchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: fix double list_del()

dlm_lowcomms_stop() was not functioning properly. Correctly, we have to
wait until all processing is finished with send_workqueue and
recv_workqueue.
T

DLM: fix double list_del()

dlm_lowcomms_stop() was not functioning properly. Correctly, we have to
wait until all processing is finished with send_workqueue and
recv_workqueue.
This problem causes the following issue. Senario is

1. dlm_send thread:
send_to_sock refers con->writequeue
2. main thread:
dlm_lowcomms_stop calls list_del
3. dlm_send thread:
send_to_sock calls list_del in writequeue_entry_complete

[ 1925.770305] dlm: canceled swork for node 4
[ 1925.772374] general protection fault: 0000 [#1] SMP
[ 1925.777930] Modules linked in: ocfs2_stack_user ocfs2 ocfs2_nodemanager ocfs2_stackglue dlm fmxnet(O) fmx_api(O) fmx_cu(O) igb(O) kvm_intel kvm irqbypass autofs4
[ 1925.794131] CPU: 3 PID: 6994 Comm: kworker/u8:0 Tainted: G O 4.4.39 #1
[ 1925.802684] Hardware name: TOSHIBA OX/OX, BIOS OX-P0015 12/03/2015
[ 1925.809595] Workqueue: dlm_send process_send_sockets [dlm]
[ 1925.815714] task: ffff8804398d3c00 ti: ffff88046910c000 task.ti: ffff88046910c000
[ 1925.824072] RIP: 0010:[<ffffffffa04bd158>] [<ffffffffa04bd158>] process_send_sockets+0xf8/0x280 [dlm]
[ 1925.834480] RSP: 0018:ffff88046910fde0 EFLAGS: 00010246
[ 1925.840411] RAX: dead000000000200 RBX: 0000000000000001 RCX: 000000000000000a
[ 1925.848372] RDX: ffff88046bd980c0 RSI: 0000000000000000 RDI: ffff8804673c5670
[ 1925.856341] RBP: ffff88046910fe20 R08: 00000000000000c9 R09: 0000000000000010
[ 1925.864311] R10: ffffffff81e22fc0 R11: 0000000000000000 R12: ffff8804673c56d8
[ 1925.872281] R13: ffff8804673c5660 R14: ffff88046bd98440 R15: 0000000000000058
[ 1925.880251] FS: 0000000000000000(0000) GS:ffff88047fd80000(0000) knlGS:0000000000000000
[ 1925.889280] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1925.895694] CR2: 00007fff09eadf58 CR3: 00000004690f5000 CR4: 00000000001006e0
[ 1925.903663] Stack:
[ 1925.905903] ffff8804673c5630 ffff8804673c5620 ffff8804673c5670 ffff88007d219b40
[ 1925.914181] ffff88046f095800 0000000000000100 ffff8800717a1400 ffff8804673c56d8
[ 1925.922459] ffff88046910fe60 ffffffff81073db2 00ff880400000000 ffff88007d219b40
[ 1925.930736] Call Trace:
[ 1925.933468] [<ffffffff81073db2>] process_one_work+0x162/0x450
[ 1925.939983] [<ffffffff81074459>] worker_thread+0x69/0x4a0
[ 1925.946109] [<ffffffff810743f0>] ? rescuer_thread+0x350/0x350
[ 1925.952622] [<ffffffff8107956f>] kthread+0xef/0x110
[ 1925.958165] [<ffffffff81079480>] ? kthread_park+0x60/0x60
[ 1925.964283] [<ffffffff8186ab2f>] ret_from_fork+0x3f/0x70
[ 1925.970312] [<ffffffff81079480>] ? kthread_park+0x60/0x60
[ 1925.976436] Code: 01 00 00 48 8b 7d d0 e8 07 d3 3a e1 45 01 7e 18 45 29 7e 1c 75 ab 41 8b 46 24 85 c0 75 a3 49 8b 16 49 8b 46 08 31 f6 48 89 42 08 <48> 89 10 48 b8 00 01 00 00 00 00 ad de 49 8b 7e 10 49 89 06 66
[ 1925.997791] RIP [<ffffffffa04bd158>] process_send_sockets+0xf8/0x280 [dlm]
[ 1926.005577] RSP <ffff88046910fde0>

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: fix remove save_cb argument from add_sock()

save_cb argument is not used. We remove them.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsuto

DLM: fix remove save_cb argument from add_sock()

save_cb argument is not used. We remove them.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: Fix saving of NULL callbacks

In a previous patch I noted that accept() often copies the struct
sock (sk) which overwrites the sock callbacks. However, in testing
we discovered t

DLM: Fix saving of NULL callbacks

In a previous patch I noted that accept() often copies the struct
sock (sk) which overwrites the sock callbacks. However, in testing
we discovered that the dlm connection structures (con) are sometimes
deleted and recreated as connections come and go, and since they're
zeroed out by kmem_cache_zalloc, the saved callback pointers are
also initialized to zero. But with today's DLM code, the callbacks
are only saved when a socket is added.

During recovery testing, we discovered a common situation in which
the new con is initialized to zero, then a socket is added after
accept(). In this case, the sock's saved values are all NULL, but
the saved values are wiped out, due to accept(). Therefore, we
don't have a known good copy of the callbacks from which we can
restore.

Since the struct sock callbacks are always good after listen(),
this patch saves the known good values after listen(). These good
values are then used for subsequent restores.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: Eliminate CF_WRITE_PENDING flag

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: David Teigland <teig

DLM: Eliminate CF_WRITE_PENDING flag

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

DLM: Eliminate CF_CONNECT_PENDING flag

Before this patch, there was a flag in the con structure that was
used to determine whether or not a connect was needed. The bit was
set here a

DLM: Eliminate CF_CONNECT_PENDING flag

Before this patch, there was a flag in the con structure that was
used to determine whether or not a connect was needed. The bit was
set here and there, and cleared here and there, so it left some
race conditions: the bit was set, work was queued, then the worker
cleared the bit, allowing someone else to set it while the worker
ran. For the most part, this worked okay, but we got into trouble
if connections were lost and it needed to reconnect.

This patch eliminates the flag in favor of simply checking if we
actually have a sock pointer while protected by the mutex.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

dlm: use sock_create_lite inside tcp_accept_from_sock

With commit 0ffdaf5b41cf ("net/sock: add WARN_ON(parent->sk)
in sock_graft()"), a calltrace happened as follows:

[ 457.018

dlm: use sock_create_lite inside tcp_accept_from_sock

With commit 0ffdaf5b41cf ("net/sock: add WARN_ON(parent->sk)
in sock_graft()"), a calltrace happened as follows:

[ 457.018340] WARNING: CPU: 0 PID: 15623 at ./include/net/sock.h:1703 inet_accept+0x135/0x140
...
[ 457.018381] RIP: 0010:inet_accept+0x135/0x140
[ 457.018381] RSP: 0018:ffffc90001727d18 EFLAGS: 00010286
[ 457.018383] RAX: 0000000000000001 RBX: ffff880012413000 RCX: 0000000000000001
[ 457.018384] RDX: 000000000000018a RSI: 00000000fffffe01 RDI: ffffffff8156fae8
[ 457.018384] RBP: ffffc90001727d38 R08: 0000000000000000 R09: 0000000000004305
[ 457.018385] R10: 0000000000000001 R11: 0000000000004304 R12: ffff880035ae7a00
[ 457.018386] R13: ffff88001282af10 R14: ffff880034e4e200 R15: 0000000000000000
[ 457.018387] FS: 0000000000000000(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
[ 457.018388] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 457.018389] CR2: 00007fdec22f9000 CR3: 0000000002b5a000 CR4: 00000000000006f0
[ 457.018395] Call Trace:
[ 457.018402] tcp_accept_from_sock.part.8+0x12d/0x449 [dlm]
[ 457.018405] ? vprintk_emit+0x248/0x2d0
[ 457.018409] tcp_accept_from_sock+0x3f/0x50 [dlm]
[ 457.018413] process_recv_sockets+0x3b/0x50 [dlm]
[ 457.018415] process_one_work+0x138/0x370
[ 457.018417] worker_thread+0x4d/0x3b0
[ 457.018419] kthread+0x109/0x140
[ 457.018421] ? rescuer_thread+0x320/0x320
[ 457.018422] ? kthread_park+0x60/0x60
[ 457.018424] ret_from_fork+0x25/0x30

Since newsocket created by sock_create_kern sets it's
sock by the path:

sock_create_kern -> __sock_creat
->pf->create => inet_create
-> sock_init_data

Then WARN_ON is triggered by "con->sock->ops->accept =>
inet_accept -> sock_graft", it also means newsock->sk
is leaked since sock_graft will replace it with a new
sk.

To resolve the issue, we need to use sock_create_lite
instead of sock_create_kern, like commit 0933a578cd55
("rds: tcp: use sock_create_lite() to create the accept
socket") did.

Reported-by: Zhilong Liu <zlliu@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

net: Work around lockdep limitation in sockets that use sockets

Lockdep issues a circular dependency warning when AFS issues an operation
through AF_RXRPC from a context in which the VFS

net: Work around lockdep limitation in sockets that use sockets

Lockdep issues a circular dependency warning when AFS issues an operation
through AF_RXRPC from a context in which the VFS/VM holds the mmap_sem.

The theory lockdep comes up with is as follows:

(1) If the pagefault handler decides it needs to read pages from AFS, it
calls AFS with mmap_sem held and AFS begins an AF_RXRPC call, but
creating a call requires the socket lock:

mmap_sem must be taken before sk_lock-AF_RXRPC

(2) afs_open_socket() opens an AF_RXRPC socket and binds it. rxrpc_bind()
binds the underlying UDP socket whilst holding its socket lock.
inet_bind() takes its own socket lock:

sk_lock-AF_RXRPC must be taken before sk_lock-AF_INET

(3) Reading from a TCP socket into a userspace buffer might cause a fault
and thus cause the kernel to take the mmap_sem, but the TCP socket is
locked whilst doing this:

sk_lock-AF_INET must be taken before mmap_sem

However, lockdep's theory is wrong in this instance because it deals only
with lock classes and not individual locks. The AF_INET lock in (2) isn't
really equivalent to the AF_INET lock in (3) as the former deals with a
socket entirely internal to the kernel that never sees userspace. This is
a limitation in the design of lockdep.

Fix the general case by:

(1) Double up all the locking keys used in sockets so that one set are
used if the socket is created by userspace and the other set is used
if the socket is created by the kernel.

(2) Store the kern parameter passed to sk_alloc() in a variable in the
sock struct (sk_kern_sock). This informs sock_lock_init(),
sock_init_data() and sk_clone_lock() as to the lock keys to be used.

Note that the child created by sk_clone_lock() inherits the parent's
kern setting.

(3) Add a 'kern' parameter to ->accept() that is analogous to the one
passed in to ->create() that distinguishes whether kernel_accept() or
sys_accept4() was the caller and can be passed to sk_alloc().

Note that a lot of accept functions merely dequeue an already
allocated socket. I haven't touched these as the new socket already
exists before we get the parameter.

Note also that there are a couple of places where I've made the accepted
socket unconditionally kernel-based:

irda_accept()
rds_rcp_accept_one()
tcp_accept_from_sock()

because they follow a sock_create_kern() and accept off of that.

Whilst creating this, I noticed that lustre and ocfs don't create sockets
through sock_create_kern() and thus they aren't marked as for-kernel,
though they appear to be internal. I wonder if these should do that so
that they use the new set of lock keys.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

show more ...

dlm: fix error return code in sctp_accept_from_sock()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Signed-o

dlm: fix error return code in sctp_accept_from_sock()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

dlm: remove lock_sock to avoid scheduling while atomic

Before this patch, functions save_callbacks and restore_callbacks
called function lock_sock and release_sock to prevent other proce

dlm: remove lock_sock to avoid scheduling while atomic

Before this patch, functions save_callbacks and restore_callbacks
called function lock_sock and release_sock to prevent other processes
from messing with the struct sock while the callbacks were saved and
restored. However, function add_sock calls write_lock_bh prior to
calling it save_callbacks, which disables preempts. So the call to
lock_sock would try to schedule when we can't schedule.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

dlm: don't save callbacks after accept

When DLM calls accept() on a socket, the comm code copies the sk
after we've saved its callbacks. Afterward, it calls add_sock which
saves the

dlm: don't save callbacks after accept

When DLM calls accept() on a socket, the comm code copies the sk
after we've saved its callbacks. Afterward, it calls add_sock which
saves the callbacks a second time. Since the error reporting function
lowcomms_error_report calls the previous callback too, this results
in a recursive call to itself. This patch adds a new parameter to
function add_sock to tell whether to save the callbacks. Function
tcp_accept_from_sock (and its sctp counterpart) then calls it with
false to avoid the recursion.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

dlm: free workqueues after the connections

After backporting commit ee44b4bc054a ("dlm: use sctp 1-to-1 API")
series to a kernel with an older workqueue which didn't use RCU yet, it

dlm: free workqueues after the connections

After backporting commit ee44b4bc054a ("dlm: use sctp 1-to-1 API")
series to a kernel with an older workqueue which didn't use RCU yet, it
was noticed that we are freeing the workqueues in dlm_lowcomms_stop()
too early as free_conn() will try to access that memory for canceling
the queued works if any.

This issue was introduced by commit 0d737a8cfd83 as before it such
attempt to cancel the queued works wasn't performed, so the issue was
not present.

This patch fixes it by simply inverting the free order.

Cc: stable@vger.kernel.org
Fixes: 0d737a8cfd83 ("dlm: fix race while closing connections")
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

dlm: Use kmemdup instead of kmalloc and memcpy

Replace calls to kmalloc followed by a memcpy with a direct call to
kmemdup.

The Coccinelle semantic patch used to make this chang

dlm: Use kmemdup instead of kmalloc and memcpy

Replace calls to kmalloc followed by a memcpy with a direct call to
kmemdup.

The Coccinelle semantic patch used to make this change is as follows:
@@
expression from,to,size,flag;
statement S;
@@

- to = \(kmalloc\|kzalloc\)(size,flag);
+ to = kmemdup(from,size,flag);
if (to==NULL || ...) S
- memcpy(to, from, size);

Signed-off-by: Amitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: David Teigland <teigland@redhat.com>

show more ...

mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros

PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possibl

mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros

PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time
ago with promise that one day it will be possible to implement page
cache with bigger chunks than PAGE_SIZE.

This promise never materialized. And unlikely will.

We have many places where PAGE_CACHE_SIZE assumed to be equal to
PAGE_SIZE. And it's constant source of confusion on whether
PAGE_CACHE_* or PAGE_* constant should be used in a particular case,
especially on the border between fs and mm.

Global switching to PAGE_CACHE_SIZE != PAGE_SIZE would cause to much
breakage to be doable.

Let's stop pretending that pages in page cache are special. They are
not.

The changes are pretty straight-forward:

- <foo> << (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;

- <foo> >> (PAGE_CACHE_SHIFT - PAGE_SHIFT) -> <foo>;

- PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} -> PAGE_{SIZE,SHIFT,MASK,ALIGN};

- page_cache_get() -> get_page();

- page_cache_release() -> put_page();

This patch contains automated changes generated with coccinelle using
script below. For some reason, coccinelle doesn't patch header files.
I've called spatch for them manually.

The only adjustment after coccinelle is revert of changes to
PAGE_CAHCE_ALIGN definition: we are going to drop it later.

There are few places in the code where coccinelle didn't reach. I'll
fix them manually in a separate patch. Comments and documentation also
will be addressed with the separate patch.

virtual patch

@@
expression E;
@@
- E << (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E

@@
expression E;
@@
- E >> (PAGE_CACHE_SHIFT - PAGE_SHIFT)
+ E

@@
@@
- PAGE_CACHE_SHIFT
+ PAGE_SHIFT

@@
@@
- PAGE_CACHE_SIZE
+ PAGE_SIZE

@@
@@
- PAGE_CACHE_MASK
+ PAGE_MASK

@@
expression E;
@@
- PAGE_CACHE_ALIGN(E)
+ PAGE_ALIGN(E)

@@
expression E;
@@
- page_cache_get(E)
+ get_page(E)

@@
expression E;
@@
- page_cache_release(E)
+ put_page(E)

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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DLM: Save and restore socket callbacks properly

This patch fixes the problems with patch b3a5bbfd7.

1. It removes a return statement from lowcomms_error_report
because it nee

DLM: Save and restore socket callbacks properly

This patch fixes the problems with patch b3a5bbfd7.

1. It removes a return statement from lowcomms_error_report
because it needs to call the original error report in all paths
through the function.
2. All socket callbacks are saved and restored, not just the
sk_error_report, and that's done so with proper locking like
sunrpc does.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

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