kernel/linux.git/fs/dlm/config.c, branch v4.9.331

fs: dlm: fix memory leak when fenced

2021-07-20T14:21:00+00:00

[ Upstream commit 700ab1c363c7b54c9ea3222379b33fc00ab02f7b ] I got some kmemleak report when a node was fenced. The user space tool dlm_controld will therefore run some rmdir() in dlm configfs which was triggering some memleaks. This patch stores the sps and cms attributes which stores some handling for subdirectories of the configfs cluster entry and free them if they get released as the parent directory gets freed. unreferenced object 0xffff88810d9e3e00 (size 192): comm "dlm_controld", pid 342, jiffies 4294698126 (age 55438.801s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 73 70 61 63 65 73 00 00 ........spaces.. 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000db8b640b>] make_cluster+0x5d/0x360 [<000000006a571db4>] configfs_mkdir+0x274/0x730 [<00000000b094501c>] vfs_mkdir+0x27e/0x340 [<0000000058b0adaf>] do_mkdirat+0xff/0x1b0 [<00000000d1ffd156>] do_syscall_64+0x40/0x80 [<00000000ab1408c8>] entry_SYSCALL_64_after_hwframe+0x44/0xae unreferenced object 0xffff88810d9e3a00 (size 192): comm "dlm_controld", pid 342, jiffies 4294698126 (age 55438.801s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 63 6f 6d 6d 73 00 00 00 ........comms... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000a7ef6ad2>] make_cluster+0x82/0x360 [<000000006a571db4>] configfs_mkdir+0x274/0x730 [<00000000b094501c>] vfs_mkdir+0x27e/0x340 [<0000000058b0adaf>] do_mkdirat+0xff/0x1b0 [<00000000d1ffd156>] do_syscall_64+0x40/0x80 [<00000000ab1408c8>] entry_SYSCALL_64_after_hwframe+0x44/0xae Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin

fs: dlm: fix configfs memory leak

2020-10-29T08:05:43+00:00

[ Upstream commit 3d2825c8c6105b0f36f3ff72760799fa2e71420e ] This patch fixes the following memory detected by kmemleak and umount gfs2 filesystem which removed the last lockspace: unreferenced object 0xffff9264f482f600 (size 192): comm "dlm_controld", pid 325, jiffies 4294690276 (age 48.136s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 6e 6f 64 65 73 00 00 00 ........nodes... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000060481d7>] make_space+0x41/0x130 [<000000008d905d46>] configfs_mkdir+0x1a2/0x5f0 [<00000000729502cf>] vfs_mkdir+0x155/0x210 [<000000000369bcf1>] do_mkdirat+0x6d/0x110 [<00000000cc478a33>] do_syscall_64+0x33/0x40 [<00000000ce9ccf01>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 The patch just remembers the "nodes" entry pointer in space as I think it's created as subdirectory when parent "spaces" is created. In function drop_space() we will lost the pointer reference to nds because configfs_remove_default_groups(). However as this subdirectory is always available when "spaces" exists it will just be freed when "spaces" will be freed. Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin

dlm: add log_info config option

2016-06-21T14:04:24+00:00

This config option can be used to disable the LOG_INFO recovery messages. Signed-off-by: Zhilong Liu Signed-off-by: David Teigland

dlm: config: Fix ENOMEM failures in make_cluster()

2016-03-29T15:28:08+00:00

Commit 1ae1602de0 "configfs: switch ->default groups to a linked list" left the NULL gps pointer behind after removing the kcalloc() call which made it non-NULL. It also left the !gps check in place so make_cluster() now fails with ENOMEM. Remove the remaining uses of the gps variable to fix that. Reviewed-by: Bob Peterson Reviewed-by: Andreas Gruenbacher Signed-off-by: Andrew Price Signed-off-by: David Teigland

configfs: switch ->default groups to a linked list

2016-03-06T15:11:24+00:00

Replace the current NULL-terminated array of default groups with a linked list. This gets rid of lots of nasty code to size and/or dynamically allocate the array. While we're at it also provide a conveniant helper to remove the default groups. Signed-off-by: Christoph Hellwig Acked-by: Felipe Balbi [drivers/usb/gadget] Acked-by: Joel Becker Acked-by: Nicholas Bellinger Reviewed-by: Sagi Grimberg

dlm: use per-attribute show and store methods

2015-10-14T05:16:18+00:00

To simplify the configfs interface and remove boilerplate code that also causes binary bloat. Signed-off-by: Christoph Hellwig Reviewed-by: David Teigland

fs/dlm/config.c: convert simple_str to kstr

2014-06-06T23:08:17+00:00

Replace obsolete functions simple_strtoul/kstrtouint simple_strtol/kstrtoint (kstr __must_check requires the right function to be applied) Signed-off-by: Fabian Frederick Cc: Christine Caulfield Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

dlm: config: using strlcpy instead of strncpy

2013-06-25T17:53:06+00:00

for NUL terminated string, need alway set '\0' in the end. Signed-off-by: Zhao Hongjiang Signed-off-by: David Teigland

fs: change return values from -EACCES to -EPERM

2013-02-26T07:46:14+00:00

According to SUSv3: [EACCES] Permission denied. An attempt was made to access a file in a way forbidden by its file access permissions. [EPERM] Operation not permitted. An attempt was made to perform an operation limited to processes with appropriate privileges or to the owner of a file or other resource. So -EPERM should be returned if capability checks fails. Strictly speaking this is an API change since the error code user sees is altered. Signed-off-by: Zhao Hongjiang Acked-by: Jan Kara Acked-by: Steven Whitehouse Acked-by: Ian Kent Cc: Al Viro Signed-off-by: Andrew Morton Signed-off-by: Al Viro

dlm: fix deadlock between dlm_send and dlm_controld

2012-08-08T16:33:35+00:00

A deadlock sometimes occurs between dlm_controld closing a lowcomms connection through configfs and dlm_send looking up the address for a new connection in configfs. dlm_controld does a configfs rmdir which calls dlm_lowcomms_close which waits for dlm_send to cancel work on the workqueues. The dlm_send workqueue thread has called tcp_connect_to_sock which calls dlm_nodeid_to_addr which does a configfs lookup and blocks on a lock held by dlm_controld in the rmdir path. The solution here is to save the node addresses within the lowcomms code so that the lowcomms workqueue does not need to step through configfs to get a node address. dlm_controld: wait_for_completion+0x1d/0x20 __cancel_work_timer+0x1b3/0x1e0 cancel_work_sync+0x10/0x20 dlm_lowcomms_close+0x4c/0xb0 [dlm] drop_comm+0x22/0x60 [dlm] client_drop_item+0x26/0x50 [configfs] configfs_rmdir+0x180/0x230 [configfs] vfs_rmdir+0xbd/0xf0 do_rmdir+0x103/0x120 sys_rmdir+0x16/0x20 dlm_send: mutex_lock+0x2b/0x50 get_comm+0x34/0x140 [dlm] dlm_nodeid_to_addr+0x18/0xd0 [dlm] tcp_connect_to_sock+0xf4/0x2d0 [dlm] process_send_sockets+0x1d2/0x260 [dlm] worker_thread+0x170/0x2a0 Signed-off-by: David Teigland