f2fs: support synchronous gc in ioctl
This patch drops in batches gc triggered through ioctl, since user
can easily control the gc by designing the loop around the ->ioctl.
We support synchronous gc by forcing using FG_GC in f2fs_gc, so with
it, user can make sure that in this round all blocks gced were
persistent in the device until ioctl returned.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index a350c2a..c269966 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1618,29 +1618,25 @@
{
struct inode *inode = file_inode(filp);
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
- __u32 i, count;
+ __u32 sync;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
- if (get_user(count, (__u32 __user *)arg))
+ if (get_user(sync, (__u32 __user *)arg))
return -EFAULT;
- if (!count || count > F2FS_BATCH_GC_MAX_NUM)
- return -EINVAL;
+ if (f2fs_readonly(sbi->sb))
+ return -EROFS;
- for (i = 0; i < count; i++) {
+ if (!sync) {
if (!mutex_trylock(&sbi->gc_mutex))
- break;
-
- if (f2fs_gc(sbi))
- break;
+ return -EBUSY;
+ } else {
+ mutex_lock(&sbi->gc_mutex);
}
- if (put_user(i, (__u32 __user *)arg))
- return -EFAULT;
-
- return 0;
+ return f2fs_gc(sbi, sync);
}
long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)