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f2fs: change to use rwsem for gc_mutex

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Mutex lock won't serialize callers, in order to avoid starving of unlucky
caller, let's use rwsem lock instead.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-01-14 19:36:50 +08:00 committed by Jaegeuk Kim
parent 52e959c6db
commit a0574e03c8
5 changed files with 27 additions and 24 deletions
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5
fs/f2fs/f2fs.h
View File

@ -1389,7 +1389,10 @@ struct f2fs_sb_info {
struct f2fs_mount_info mount_opt; /* mount options */
/* for cleaning operations */
struct mutex gc_mutex; /* mutex for GC */
struct rw_semaphore gc_lock; /*
* semaphore for GC, avoid
* race between GC and GC or CP
*/
struct f2fs_gc_kthread *gc_thread; /* GC thread */
unsigned int cur_victim_sec; /* current victim section num */
unsigned int gc_mode; /* current GC state */

12
fs/f2fs/file.c
View File

@ -1638,7 +1638,7 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
next_alloc:
if (has_not_enough_free_secs(sbi, 0,
GET_SEC_FROM_SEG(sbi, overprovision_segments(sbi)))) {
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
err = f2fs_gc(sbi, true, false, NULL_SEGNO);
if (err && err != -ENODATA && err != -EAGAIN)
goto out_err;
@ -2446,12 +2446,12 @@ static int f2fs_ioc_gc(struct file *filp, unsigned long arg)
return ret;
if (!sync) {
if (!mutex_trylock(&sbi->gc_mutex)) {
if (!down_write_trylock(&sbi->gc_lock)) {
ret = -EBUSY;
goto out;
}
} else {
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
}
ret = f2fs_gc(sbi, sync, true, NULL_SEGNO);
@ -2489,12 +2489,12 @@ static int f2fs_ioc_gc_range(struct file *filp, unsigned long arg)
do_more:
if (!range.sync) {
if (!mutex_trylock(&sbi->gc_mutex)) {
if (!down_write_trylock(&sbi->gc_lock)) {
ret = -EBUSY;
goto out;
}
} else {
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
}
ret = f2fs_gc(sbi, range.sync, true, GET_SEGNO(sbi, range.start));
@ -2925,7 +2925,7 @@ static int f2fs_ioc_flush_device(struct file *filp, unsigned long arg)
end_segno = min(start_segno + range.segments, dev_end_segno);
while (start_segno < end_segno) {
if (!mutex_trylock(&sbi->gc_mutex)) {
if (!down_write_trylock(&sbi->gc_lock)) {
ret = -EBUSY;
goto out;
}

12
fs/f2fs/gc.c
View File

@ -78,18 +78,18 @@ static int gc_thread_func(void *data)
*/
if (sbi->gc_mode == GC_URGENT) {
wait_ms = gc_th->urgent_sleep_time;
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
goto do_gc;
}
if (!mutex_trylock(&sbi->gc_mutex)) {
if (!down_write_trylock(&sbi->gc_lock)) {
stat_other_skip_bggc_count(sbi);
goto next;
}
if (!is_idle(sbi, GC_TIME)) {
increase_sleep_time(gc_th, &wait_ms);
mutex_unlock(&sbi->gc_mutex);
up_write(&sbi->gc_lock);
stat_io_skip_bggc_count(sbi);
goto next;
}
@ -1370,7 +1370,7 @@ stop:
reserved_segments(sbi),
prefree_segments(sbi));
mutex_unlock(&sbi->gc_mutex);
up_write(&sbi->gc_lock);
put_gc_inode(&gc_list);
@ -1409,9 +1409,9 @@ static int free_segment_range(struct f2fs_sb_info *sbi, unsigned int start,
.iroot = RADIX_TREE_INIT(GFP_NOFS),
};
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
do_garbage_collect(sbi, segno, &gc_list, FG_GC);
mutex_unlock(&sbi->gc_mutex);
up_write(&sbi->gc_lock);
put_gc_inode(&gc_list);
if (get_valid_blocks(sbi, segno, true))

6
fs/f2fs/segment.c
View File

@ -504,7 +504,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
* dir/node pages without enough free segments.
*/
if (has_not_enough_free_secs(sbi, 0, 0)) {
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
f2fs_gc(sbi, false, false, NULL_SEGNO);
}
}
@ -2859,9 +2859,9 @@ int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range)
if (sbi->discard_blks == 0)
goto out;
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
err = f2fs_write_checkpoint(sbi, &cpc);
mutex_unlock(&sbi->gc_mutex);
up_write(&sbi->gc_lock);
if (err)
goto out;

16
fs/f2fs/super.c
View File

@ -1246,9 +1246,9 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
cpc.reason = __get_cp_reason(sbi);
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
err = f2fs_write_checkpoint(sbi, &cpc);
mutex_unlock(&sbi->gc_mutex);
up_write(&sbi->gc_lock);
}
f2fs_trace_ios(NULL, 1);
@ -1629,7 +1629,7 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
f2fs_update_time(sbi, DISABLE_TIME);
while (!f2fs_time_over(sbi, DISABLE_TIME)) {
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
err = f2fs_gc(sbi, true, false, NULL_SEGNO);
if (err == -ENODATA) {
err = 0;
@ -1651,7 +1651,7 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
goto restore_flag;
}
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
cpc.reason = CP_PAUSE;
set_sbi_flag(sbi, SBI_CP_DISABLED);
err = f2fs_write_checkpoint(sbi, &cpc);
@ -1663,7 +1663,7 @@ static int f2fs_disable_checkpoint(struct f2fs_sb_info *sbi)
spin_unlock(&sbi->stat_lock);
out_unlock:
mutex_unlock(&sbi->gc_mutex);
up_write(&sbi->gc_lock);
restore_flag:
sbi->sb->s_flags = s_flags; /* Restore MS_RDONLY status */
return err;
@ -1671,12 +1671,12 @@ restore_flag:
static void f2fs_enable_checkpoint(struct f2fs_sb_info *sbi)
{
mutex_lock(&sbi->gc_mutex);
down_write(&sbi->gc_lock);
f2fs_dirty_to_prefree(sbi);
clear_sbi_flag(sbi, SBI_CP_DISABLED);
set_sbi_flag(sbi, SBI_IS_DIRTY);
mutex_unlock(&sbi->gc_mutex);
up_write(&sbi->gc_lock);
f2fs_sync_fs(sbi->sb, 1);
}
@ -3427,7 +3427,7 @@ try_onemore:
/* init f2fs-specific super block info */
sbi->valid_super_block = valid_super_block;
mutex_init(&sbi->gc_mutex);
init_rwsem(&sbi->gc_lock);
mutex_init(&sbi->writepages);
mutex_init(&sbi->cp_mutex);
mutex_init(&sbi->resize_mutex);