On 2019/6/5 11:33, sunqiuyang wrote: > From: Qiuyang Sun <sunqiuyang@xxxxxxxxxx> > > This ioctl shrinks a given length (aligned to sections) from end of the > main area. Any cursegs and valid blocks will be moved out before > invalidating the range. > > This feature can be used for adjusting partition sizes online. > -- > Changlog v1 ==> v2: > > Sahitya Tummala: > - Add this ioctl for f2fs_compat_ioctl() as well. > - Fix debugfs status to reflect the online resize changes. > - Fix potential race between online resize path and allocate new data > block path or gc path. > > Others: > - Rename some identifiers. > - Add some error handling branches. > - Clear sbi->next_victim_seg[BG_GC/FG_GC] in shrinking range. > -- > Changelog v2 ==> v3: > Implement this interface as ext4's, and change the parameter from shrunk > bytes to new block count of F2FS. > -- > Changelog v3 ==> v4: > - During resizing, force to empty sit_journal and forbid adding new > entries to it, in order to avoid invalid segno in journal after resize. > - Reduce sbi->user_block_count before resize starts. > - Commit the updated superblock first, and then update in-memory metadata > only when the former succeeds. > - Target block count must align to sections. > -- > Changelog v4 ==> v5: > Write checkpoint before and after committing the new superblock, w/o > CP_FSCK_FLAG respectively, so that the FS can be fixed by fsck even if > resize fails after the new superblock is committed. > -- > Changelog v5 ==> v6: > - In free_segment_range(), reduce granularity of gc_mutex. > - Add protection on curseg migration. > -- > Changelog v6 ==> v7: > - Add freeze_bdev() and thaw_bdev() for resize fs. > - Remove CUR_MAIN_SECS and use MAIN_SECS directly for allocation. > - Recover super_block and FS metadata when resize fails. > -- > Changelog v7 ==> v8: > - No need to clear CP_FSCK_FLAG in update_ckpt_flags(). > - Clean up the sb and fs metadata update functions for resize_fs. > > Signed-off-by: Qiuyang Sun <sunqiuyang@xxxxxxxxxx> > Signed-off-by: Chao Yu <yuchao0@xxxxxxxxxx> > Signed-off-by: Sahitya Tummala <stummala@xxxxxxxxxxxxxx> Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx> Qiuyang, could you please add one f2fs individual testcase in fstest suit to do simple test with this ioctl. e.g. - mkfs & mount - fragment image - resizefs ioctl - check fs size via statfs - umount & fsck - maybe mount & check again Thanks,
