There are reports that system cannot suspend due to running trim because the task responsible for trimming the device isn't able to finish in time, especially since we have a free extent discarding phase, which can trim a lot of unallocated space. There are no limits on the trim size (unlike the block group part). Since trime isn't a critical call it can be interrupted at any time, in such cases we stop the trim, report the amount of discarded bytes and return an error. Link: https://bugzilla.kernel.org/show_bug.cgi?id=219180 Link: https://bugzilla.suse.com/show_bug.cgi?id=1229737 CC: stable@xxxxxxxxxxxxxxx # 5.15+ Signed-off-by: Luca Stefani <luca.stefani.ge1@xxxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: David Sterba <dsterba@xxxxxxxx> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index ad70548d1f72..d9f511babd89 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -1316,6 +1316,11 @@ static int btrfs_issue_discard(struct block_device *bdev, u64 start, u64 len, start += bytes_to_discard; bytes_left -= bytes_to_discard; *discarded_bytes += bytes_to_discard; + + if (btrfs_trim_interrupted()) { + ret = -ERESTARTSYS; + break; + } } return ret; @@ -6470,7 +6475,7 @@ static int btrfs_trim_free_extents(struct btrfs_device *device, u64 *trimmed) start += len; *trimmed += bytes; - if (fatal_signal_pending(current)) { + if (btrfs_trim_interrupted()) { ret = -ERESTARTSYS; break; } diff --git a/fs/btrfs/free-space-cache.c b/fs/btrfs/free-space-cache.c index eaa1dbd31352..f4bcb2530660 100644 --- a/fs/btrfs/free-space-cache.c +++ b/fs/btrfs/free-space-cache.c @@ -3809,7 +3809,7 @@ static int trim_no_bitmap(struct btrfs_block_group *block_group, if (async && *total_trimmed) break; - if (fatal_signal_pending(current)) { + if (btrfs_trim_interrupted()) { ret = -ERESTARTSYS; break; } @@ -4000,7 +4000,7 @@ static int trim_bitmaps(struct btrfs_block_group *block_group, } block_group->discard_cursor = start; - if (fatal_signal_pending(current)) { + if (btrfs_trim_interrupted()) { if (start != offset) reset_trimming_bitmap(ctl, offset); ret = -ERESTARTSYS; diff --git a/fs/btrfs/free-space-cache.h b/fs/btrfs/free-space-cache.h index 83774bfd7b3b..9f1dbfdee8ca 100644 --- a/fs/btrfs/free-space-cache.h +++ b/fs/btrfs/free-space-cache.h @@ -10,6 +10,7 @@ #include <linux/list.h> #include <linux/spinlock.h> #include <linux/mutex.h> +#include <linux/freezer.h> #include "fs.h" struct inode; @@ -56,6 +57,11 @@ static inline bool btrfs_free_space_trimming_bitmap( return (info->trim_state == BTRFS_TRIM_STATE_TRIMMING); } +static inline bool btrfs_trim_interrupted(void) +{ + return fatal_signal_pending(current) || freezing(current); +} + /* * Deltas are an effective way to populate global statistics. Give macro names * to make it clear what we're doing. An example is discard_extents in
