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f2fs: change to use rwsem for cp_mutex

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Use rwsem to ensure serialization of the callers and to avoid
starvation of high priority tasks, when the system is under
heavy IO workload.

Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Sahitya Tummala 2020-11-23 10:58:32 +05:30 committed by Jaegeuk Kim
parent 7ad08a58bf
commit 8769918bf0
5 changed files with 10 additions and 10 deletions
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8
fs/f2fs/checkpoint.c
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@ -348,13 +348,13 @@ static int f2fs_write_meta_pages(struct address_space *mapping,
goto skip_write;
/* if locked failed, cp will flush dirty pages instead */
if (!mutex_trylock(&sbi->cp_mutex))
if (!down_write_trylock(&sbi->cp_global_sem))
goto skip_write;
trace_f2fs_writepages(mapping->host, wbc, META);
diff = nr_pages_to_write(sbi, META, wbc);
written = f2fs_sync_meta_pages(sbi, META, wbc->nr_to_write, FS_META_IO);
mutex_unlock(&sbi->cp_mutex);
up_write(&sbi->cp_global_sem);
wbc->nr_to_write = max((long)0, wbc->nr_to_write - written - diff);
return 0;
@ -1572,7 +1572,7 @@ int f2fs_write_checkpoint(struct f2fs_sb_info *sbi, struct cp_control *cpc)
f2fs_warn(sbi, "Start checkpoint disabled!");
}
if (cpc->reason != CP_RESIZE)
mutex_lock(&sbi->cp_mutex);
down_write(&sbi->cp_global_sem);
if (!is_sbi_flag_set(sbi, SBI_IS_DIRTY) &&
((cpc->reason & CP_FASTBOOT) || (cpc->reason & CP_SYNC) ||
@ -1647,7 +1647,7 @@ stop:
trace_f2fs_write_checkpoint(sbi->sb, cpc->reason, "finish checkpoint");
out:
if (cpc->reason != CP_RESIZE)
mutex_unlock(&sbi->cp_mutex);
up_write(&sbi->cp_global_sem);
return err;
}

2
fs/f2fs/f2fs.h
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@ -1369,7 +1369,7 @@ struct f2fs_sb_info {
int cur_cp_pack; /* remain current cp pack */
spinlock_t cp_lock; /* for flag in ckpt */
struct inode *meta_inode; /* cache meta blocks */
struct mutex cp_mutex; /* checkpoint procedure lock */
struct rw_semaphore cp_global_sem; /* checkpoint procedure lock */
struct rw_semaphore cp_rwsem; /* blocking FS operations */
struct rw_semaphore node_write; /* locking node writes */
struct rw_semaphore node_change; /* locking node change */

4
fs/f2fs/gc.c
View File

@ -1986,7 +1986,7 @@ int f2fs_resize_fs(struct f2fs_sb_info *sbi, __u64 block_count)
freeze_super(sbi->sb);
down_write(&sbi->gc_lock);
mutex_lock(&sbi->cp_mutex);
down_write(&sbi->cp_global_sem);
spin_lock(&sbi->stat_lock);
if (shrunk_blocks + valid_user_blocks(sbi) +
@ -2031,7 +2031,7 @@ recover_out:
spin_unlock(&sbi->stat_lock);
}
out_err:
mutex_unlock(&sbi->cp_mutex);
up_write(&sbi->cp_global_sem);
up_write(&sbi->gc_lock);
thaw_super(sbi->sb);
clear_sbi_flag(sbi, SBI_IS_RESIZEFS);

4
fs/f2fs/recovery.c
View File

@ -799,7 +799,7 @@ int f2fs_recover_fsync_data(struct f2fs_sb_info *sbi, bool check_only)
INIT_LIST_HEAD(&dir_list);
/* prevent checkpoint */
mutex_lock(&sbi->cp_mutex);
down_write(&sbi->cp_global_sem);
/* step #1: find fsynced inode numbers */
err = find_fsync_dnodes(sbi, &inode_list, check_only);
@ -850,7 +850,7 @@ skip:
if (!err)
clear_sbi_flag(sbi, SBI_POR_DOING);
mutex_unlock(&sbi->cp_mutex);
up_write(&sbi->cp_global_sem);
/* let's drop all the directory inodes for clean checkpoint */
destroy_fsync_dnodes(&dir_list, err);

2
fs/f2fs/super.c
View File

@ -3551,7 +3551,7 @@ try_onemore:
sbi->valid_super_block = valid_super_block;
init_rwsem(&sbi->gc_lock);
mutex_init(&sbi->writepages);
mutex_init(&sbi->cp_mutex);
init_rwsem(&sbi->cp_global_sem);
init_rwsem(&sbi->node_write);
init_rwsem(&sbi->node_change);