f2fs: add ioctl to do gc with target block address

This patch adds f2fs_ioc_gc_range() to move blocks located in the given
range.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 91db1d0..c27a626 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -303,6 +303,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
                                                struct f2fs_move_range)
 #define F2FS_IOC_FLUSH_DEVICE          _IOW(F2FS_IOCTL_MAGIC, 10,      \
                                                struct f2fs_flush_device)
+#define F2FS_IOC_GARBAGE_COLLECT_RANGE _IOW(F2FS_IOCTL_MAGIC, 11,      \
+                                               struct f2fs_gc_range)
 
 #define F2FS_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
 #define F2FS_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
@@ -327,6 +329,12 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
 #define F2FS_IOC32_GETVERSION          FS_IOC32_GETVERSION
 #endif
 
+struct f2fs_gc_range {
+       u32 sync;
+       u64 start;
+       u64 len;
+};
+
 struct f2fs_defragment {
        u64 start;
        u64 len;

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 6a201c6..3f56b27 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1911,6 +1911,50 @@ out:
        return ret;
 }
 
+static int f2fs_ioc_gc_range(struct file *filp, unsigned long arg)
+{
+       struct inode *inode = file_inode(filp);
+       struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+       struct f2fs_gc_range range;
+       u64 end;
+       int ret;
+
+       if (!capable(CAP_SYS_ADMIN))
+               return -EPERM;
+
+       if (copy_from_user(&range, (struct f2fs_gc_range __user *)arg,
+                                                       sizeof(range)))
+               return -EFAULT;
+
+       if (f2fs_readonly(sbi->sb))
+               return -EROFS;
+
+       ret = mnt_want_write_file(filp);
+       if (ret)
+               return ret;
+
+       end = range.start + range.len;
+       if (range.start < MAIN_BLKADDR(sbi) || end >= MAX_BLKADDR(sbi))
+               return -EINVAL;
+do_more:
+       if (!range.sync) {
+               if (!mutex_trylock(&sbi->gc_mutex)) {
+                       ret = -EBUSY;
+                       goto out;
+               }
+       } else {
+               mutex_lock(&sbi->gc_mutex);
+       }
+
+       ret = f2fs_gc(sbi, range.sync, true, GET_SEGNO(sbi, range.start));
+       range.start += sbi->blocks_per_seg;
+       if (range.start <= end)
+               goto do_more;
+out:
+       mnt_drop_write_file(filp);
+       return ret;
+}
+
 static int f2fs_ioc_write_checkpoint(struct file *filp, unsigned long arg)
 {
        struct inode *inode = file_inode(filp);
@@ -2355,6 +2399,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
                return f2fs_ioc_get_encryption_pwsalt(filp, arg);
        case F2FS_IOC_GARBAGE_COLLECT:
                return f2fs_ioc_gc(filp, arg);
+       case F2FS_IOC_GARBAGE_COLLECT_RANGE:
+               return f2fs_ioc_gc_range(filp, arg);
        case F2FS_IOC_WRITE_CHECKPOINT:
                return f2fs_ioc_write_checkpoint(filp, arg);
        case F2FS_IOC_DEFRAGMENT:
@@ -2423,6 +2469,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
        case F2FS_IOC_GET_ENCRYPTION_PWSALT:
        case F2FS_IOC_GET_ENCRYPTION_POLICY:
        case F2FS_IOC_GARBAGE_COLLECT:
+       case F2FS_IOC_GARBAGE_COLLECT_RANGE:
        case F2FS_IOC_WRITE_CHECKPOINT:
        case F2FS_IOC_DEFRAGMENT:
        case F2FS_IOC_MOVE_RANGE: