defrag-11-add-ioc-block-release-ioctl

   1 ext4: online defrag: Add the EXT4_IOC_BLOCK_RELEASE ioctl.
   2
   3 From: Akira Fujita <a-fujita@rs.jp.nec.com>
   4
   5 The EXT4_IOC_BLOCK_RELEASE releases the reserved blocks
   6 which target inode holds.
   7 This ioctl is used if defrag failed and it was after the block reservation.
   8
   9 The block reservation will be removed from defrag in the next version,
  10 so this ioctl also will go away.
  11
  12 Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
  13 Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com>
  14 ---
  15  fs/ext4/defrag.c |    4 ++++
  16  fs/ext4/ext4.h   |    1 +
  17  fs/ext4/ioctl.c  |    3 ++-
  18  3 files changed, 7 insertions(+), 1 deletions(-)
  19
  20 diff --git a/fs/ext4/defrag.c b/fs/ext4/defrag.c
  21 index a2b17c5..bdfbb68 100644
  22 --- a/fs/ext4/defrag.c
  23 +++ b/fs/ext4/defrag.c
  24 @@ -622,6 +622,10 @@ int ext4_defrag_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
  25
  26                 err = ext4_defrag_move_victim(filp, &ext_info);
  27
  28 +       } else if (cmd == EXT4_IOC_BLOCK_RELEASE) {
  29 +               down_write(&EXT4_I(inode)->i_data_sem);
  30 +               ext4_discard_reservation(inode);
  31 +               up_write(&EXT4_I(inode)->i_data_sem);
  32         } else if (cmd == EXT4_IOC_DEFRAG) {
  33                 struct ext4_ext_defrag_data defrag;
  34                 struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
  35 diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
  36 index 4e54eb4..6ad86f9 100644
  37 --- a/fs/ext4/ext4.h
  38 +++ b/fs/ext4/ext4.h
  39 @@ -314,6 +314,7 @@ struct ext4_new_group_data {
  40  #define EXT4_IOC_FIEMAP_INO            _IOW('f', 19, struct fiemap_ino)
  41  #define EXT4_IOC_RESERVE_BLOCK         _IOW('f', 20, struct ext4_extents_info)
  42  #define EXT4_IOC_MOVE_VICTIM           _IOW('f', 21, struct ext4_extents_info)
  43 +#define EXT4_IOC_BLOCK_RELEASE         _IO('f', 22)
  44
  45  /*
  46   * ioctl commands in 32 bit emulation
  47 diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
  48 index a596785..329847f 100644
  49 --- a/fs/ext4/ioctl.c
  50 +++ b/fs/ext4/ioctl.c
  51 @@ -262,7 +262,8 @@ setversion_out:
  52         case EXT4_IOC_FREE_BLOCKS_INFO:
  53         case EXT4_IOC_FIEMAP_INO:
  54         case EXT4_IOC_RESERVE_BLOCK:
  55 -       case EXT4_IOC_MOVE_VICTIM: {
  56 +       case EXT4_IOC_MOVE_VICTIM:
  57 +       case EXT4_IOC_BLOCK_RELEASE: {
  58                 return ext4_defrag_ioctl(inode, filp, cmd, arg);
  59         }
  60         case EXT4_IOC_GROUP_ADD: {
  61
  62 --
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