kernel/drivers/md/dm-path-selector.c, branch linux-rolling-stable

dm: replace -EEXIST with -EBUSY

2026-03-04T12:20:12Z

[ Upstream commit b13ef361d47f09b7aecd18e0383ecc83ff61057e ] The -EEXIST error code is reserved by the module loading infrastructure to indicate that a module is already loaded. When a module's init function returns -EEXIST, userspace tools like kmod interpret this as "module already loaded" and treat the operation as successful, returning 0 to the user even though the module initialization actually failed. This follows the precedent set by commit 54416fd76770 ("netfilter: conntrack: helper: Replace -EEXIST by -EBUSY") which fixed the same issue in nf_conntrack_helper_register(). Affected modules: * dm_cache dm_clone dm_integrity dm_mirror dm_multipath dm_pcache * dm_vdo dm-ps-round-robin dm_historical_service_time dm_io_affinity * dm_queue_length dm_service_time dm_snapshot Signed-off-by: Daniel Gomez Signed-off-by: Mikulas Patocka Signed-off-by: Sasha Levin

dm-mpath: make dm_unregister_path_selector return void

2025-06-30T14:20:04Z

dm_unregister_path_selector may only return error if there's a bug in the code - so we make it return void and print a warning if the user abuses this function to unregister a target that was not registered. Signed-off-by: Mikulas Patocka

dm: adjust EXPORT_SYMBOL() to follow functions immediately

2023-02-14T19:23:07Z

Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer

dm: add missing SPDX-License-Indentifiers

2023-02-14T19:23:06Z

'GPL-2.0-only' is used instead of 'GPL-2.0' because SPDX has deprecated its use. Suggested-by: John Wiele Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer

md: Add module.h to all files using it implicitly

2011-10-31T23:31:18Z

A pending cleanup will mean that module.h won't be implicitly everywhere anymore. Make sure the modular drivers in md dir are actually calling out for explicitly in advance. Signed-off-by: Paul Gortmaker

dm: path selector use module refcount directly

2009-04-02T18:55:27Z

Fix refcount corruption in dm-path-selector Refcounting with non-atomic ops under shared lock will corrupt the counter in multi-processor system and may trigger BUG_ON(). Use module refcount. # same approach as dm-target-use-module-refcount-directly.patch here # https://www.redhat.com/archives/dm-devel/2008-December/msg00075.html Typical oops: kernel BUG at linux-2.6.29-rc3/drivers/md/dm-path-selector.c:90! Pid: 11148, comm: dmsetup Not tainted 2.6.29-rc3-nm #1 dm_put_path_selector+0x4d/0x61 [dm_multipath] Call Trace: [] free_priority_group+0x33/0xb3 [dm_multipath] [] free_multipath+0x31/0x67 [dm_multipath] [] multipath_dtr+0x2d/0x32 [dm_multipath] [] dm_table_destroy+0x64/0xd8 [dm_mod] [] __unbind+0x46/0x4b [dm_mod] [] dm_swap_table+0x60/0x14d [dm_mod] [] dev_suspend+0xfd/0x177 [dm_mod] [] dm_ctl_ioctl+0x24c/0x29c [dm_mod] [] ? get_page_from_freelist+0x49c/0x61d [] ? dev_suspend+0x0/0x177 [dm_mod] [] vfs_ioctl+0x2a/0x77 [] do_vfs_ioctl+0x448/0x4a0 [] sys_ioctl+0x57/0x7a [] system_call_fastpath+0x16/0x1b Cc: stable@kernel.org Signed-off-by: Jun'ichi Nomura Signed-off-by: Alasdair G Kergon

dm: remove dm header from targets

2008-10-21T16:44:59Z

Change #include "dm.h" to #include in all targets. Targets should not need direct access to internal DM structures. Signed-off-by: Mikulas Patocka Signed-off-by: Alasdair G Kergon

dm: use kzalloc

2007-10-20T01:01:07Z

Convert kmalloc() + memset() to kzalloc(). Signed-off-by: Dmitry Monakhov Signed-off-by: Alasdair G Kergon

BUG_ON() Conversion in md/dm-path-selector.c

2006-03-26T16:21:58Z

this changes if() BUG(); constructs to BUG_ON() which is cleaner and can better optimized away Signed-off-by: Eric Sesterhenn Signed-off-by: Adrian Bunk

[PATCH] device-mapper: Some missing statics

2005-05-05T23:36:46Z

This patch makes some needlessly global code static. Signed-Off-By: Alasdair G Kergon Signed-off-by: Adrian Bunk Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds