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dm-ebs: fix prefetch-vs-suspend race

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commit 9c565428788fb9b49066f94ab7b10efc686a0a4c upstream.

There's a possible race condition in dm-ebs - dm bufio prefetch may be in
progress while the device is suspended. Fix this by calling
dm_bufio_client_reset in the postsuspend hook.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka
2025-03-28 16:19:07 +01:00
committed by Greg Kroah-Hartman
parent 08deafddfc
commit a1a4fdc33d
1 changed files with 7 additions and 0 deletions
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drivers/md/dm-ebs-target.c
+7
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@@ -390,6 +390,12 @@ static int ebs_map(struct dm_target *ti, struct bio *bio)
return DM_MAPIO_REMAPPED; return DM_MAPIO_REMAPPED;
} }
static void ebs_postsuspend(struct dm_target *ti)
{
struct ebs_c *ec = ti->private;
dm_bufio_client_reset(ec->bufio);
}
static void ebs_status(struct dm_target *ti, status_type_t type, static void ebs_status(struct dm_target *ti, status_type_t type,
unsigned int status_flags, char *result, unsigned int maxlen) unsigned int status_flags, char *result, unsigned int maxlen)
{ {
@@ -447,6 +453,7 @@ static struct target_type ebs_target = {
.ctr = ebs_ctr, .ctr = ebs_ctr,
.dtr = ebs_dtr, .dtr = ebs_dtr,
.map = ebs_map, .map = ebs_map,
.postsuspend = ebs_postsuspend,
.status = ebs_status, .status = ebs_status,
.io_hints = ebs_io_hints, .io_hints = ebs_io_hints,
.prepare_ioctl = ebs_prepare_ioctl, .prepare_ioctl = ebs_prepare_ioctl,