This is a note to let you know that I've just added the patch titled
ext4: do not let fstrim block system suspend
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-do-not-let-fstrim-block-system-suspend.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 63fc38e35ab0e5b042f060431aae33af99041217
Author: Jan Kara <jack@xxxxxxx>
Date: Wed Sep 13 17:04:55 2023 +0200
ext4: do not let fstrim block system suspend
[ Upstream commit 5229a658f6453362fbb9da6bf96872ef25a7097e ]
Len Brown has reported that system suspend sometimes fail due to
inability to freeze a task working in ext4_trim_fs() for one minute.
Trimming a large filesystem on a disk that slowly processes discard
requests can indeed take a long time. Since discard is just an advisory
call, it is perfectly fine to interrupt it at any time and the return
number of discarded blocks until that moment. Do that when we detect the
task is being frozen.
Cc: stable@xxxxxxxxxx
Reported-by: Len Brown <lenb@xxxxxxxxxx>
Suggested-by: Dave Chinner <david@xxxxxxxxxxxxx>
References: https://bugzilla.kernel.org/show_bug.cgi?id=216322
Signed-off-by: Jan Kara <jack@xxxxxxx>
Link: https://lore.kernel.org/r/20230913150504.9054-2-jack@xxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 94b3bf8173e20..fb2f255c48e81 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/nospec.h>
#include <linux/backing-dev.h>
+#include <linux/freezer.h>
#include <trace/events/ext4.h>
#ifdef CONFIG_EXT4_DEBUG
@@ -5194,6 +5195,11 @@ static ext4_grpblk_t ext4_last_grp_cluster(struct super_block *sb,
EXT4_CLUSTER_BITS(sb);
}
+static bool ext4_trim_interrupted(void)
+{
+ return fatal_signal_pending(current) || freezing(current);
+}
+
static int ext4_try_to_trim_range(struct super_block *sb,
struct ext4_buddy *e4b, ext4_grpblk_t start,
ext4_grpblk_t max, ext4_grpblk_t minblocks)
@@ -5225,8 +5231,8 @@ static int ext4_try_to_trim_range(struct super_block *sb,
free_count += next - start;
start = next + 1;
- if (fatal_signal_pending(current))
- return -ERESTARTSYS;
+ if (ext4_trim_interrupted())
+ return count;
if (need_resched()) {
ext4_unlock_group(sb, e4b->bd_group);
@@ -5353,6 +5359,8 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
end = EXT4_CLUSTERS_PER_GROUP(sb) - 1;
for (group = first_group; group <= last_group; group++) {
+ if (ext4_trim_interrupted())
+ break;
grp = ext4_get_group_info(sb, group);
/* We only do this if the grp has never been initialized */
if (unlikely(EXT4_MB_GRP_NEED_INIT(grp))) {
