add-journal-no-cleanup-option

   1 ext4, jbd2: add the journal_nocleanup mount option
   2
   3 This debugging option is useful for generating test cases for the
   4 journal replay code.
   5
   6 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
   7 ---
   8  fs/ext4/ext4.h       |  1 +
   9  fs/ext4/super.c      | 11 ++++++++++-
  10  fs/jbd2/journal.c    | 12 +++++++++---
  11  include/linux/jbd2.h |  1 +
  12  4 files changed, 21 insertions(+), 4 deletions(-)
  13
  14 diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
  15 index 4e091eae38b1..d1389c9fb8a1 100644
  16 --- a/fs/ext4/ext4.h
  17 +++ b/fs/ext4/ext4.h
  18 @@ -1108,6 +1108,7 @@ struct ext4_inode_info {
  19  #define EXT4_MOUNT_DIOREAD_NOLOCK      0x400000 /* Enable support for dio read nolocking */
  20  #define EXT4_MOUNT_JOURNAL_CHECKSUM    0x800000 /* Journal checksums */
  21  #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT        0x1000000 /* Journal Async Commit */
  22 +#define EXT4_MOUNT_JOURNAL_NOCLEANUP   0x2000000 /* Preserve the journal on unmount */
  23  #define EXT4_MOUNT_DELALLOC            0x8000000 /* Delalloc support */
  24  #define EXT4_MOUNT_DATA_ERR_ABORT      0x10000000 /* Abort on file data write */
  25  #define EXT4_MOUNT_BLOCK_VALIDITY      0x20000000 /* Block validity checking */
  26 diff --git a/fs/ext4/super.c b/fs/ext4/super.c
  27 index 6783af7ec115..06da44b3d8e1 100644
  28 --- a/fs/ext4/super.c
  29 +++ b/fs/ext4/super.c
  30 @@ -888,7 +888,7 @@ static void ext4_put_super(struct super_block *sb)
  31         ext4_mb_release(sb);
  32         ext4_ext_release(sb);
  33
  34 -       if (!sb_rdonly(sb) && !aborted) {
  35 +       if (!sb_rdonly(sb) && !aborted && !test_opt(sb, JOURNAL_NOCLEANUP)) {
  36                 ext4_clear_feature_journal_needs_recovery(sb);
  37                 es->s_state = cpu_to_le16(sbi->s_mount_state);
  38         }
  39 @@ -1348,6 +1348,7 @@ enum {
  40         Opt_nomblk_io_submit, Opt_block_validity, Opt_noblock_validity,
  41         Opt_inode_readahead_blks, Opt_journal_ioprio,
  42         Opt_dioread_nolock, Opt_dioread_lock,
  43 +       Opt_journal_nocleanup, Opt_journal_cleanup,
  44         Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
  45         Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
  46  };
  47 @@ -1434,6 +1435,8 @@ static const match_table_t tokens = {
  48         {Opt_test_dummy_encryption, "test_dummy_encryption"},
  49         {Opt_nombcache, "nombcache"},
  50         {Opt_nombcache, "no_mbcache"},  /* for backward compatibility */
  51 +       {Opt_journal_nocleanup, "journal_nocleanup"},
  52 +       {Opt_journal_cleanup, "journal_cleanup"},
  53         {Opt_removed, "check=none"},    /* mount option from ext2/3 */
  54         {Opt_removed, "nocheck"},       /* mount option from ext2/3 */
  55         {Opt_removed, "reservation"},   /* mount option from ext2/3 */
  56 @@ -1642,6 +1645,8 @@ static const struct mount_opts {
  57         {Opt_max_dir_size_kb, 0, MOPT_GTE0},
  58         {Opt_test_dummy_encryption, 0, MOPT_GTE0},
  59         {Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
  60 +       {Opt_journal_nocleanup, EXT4_MOUNT_JOURNAL_NOCLEANUP, MOPT_SET},
  61 +       {Opt_journal_cleanup, EXT4_MOUNT_JOURNAL_NOCLEANUP, MOPT_CLEAR},
  62         {Opt_err, 0, 0}
  63  };
  64
  65 @@ -4447,6 +4452,10 @@ static void ext4_init_journal_params(struct super_block *sb, journal_t *journal)
  66                 journal->j_flags |= JBD2_ABORT_ON_SYNCDATA_ERR;
  67         else
  68                 journal->j_flags &= ~JBD2_ABORT_ON_SYNCDATA_ERR;
  69 +       if (test_opt(sb, JOURNAL_NOCLEANUP))
  70 +               journal->j_flags |= JBD2_NO_CLEANUP;
  71 +       else
  72 +               journal->j_flags &= ~JBD2_NO_CLEANUP;
  73         write_unlock(&journal->j_state_lock);
  74  }
  75
  76 diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
  77 index b01f07f65d59..218c50dd9dfc 100644
  78 --- a/fs/jbd2/journal.c
  79 +++ b/fs/jbd2/journal.c
  80 @@ -1724,6 +1724,11 @@ int jbd2_journal_destroy(journal_t *journal)
  81         if (journal->j_running_transaction)
  82                 jbd2_journal_commit_transaction(journal);
  83
  84 +       if (journal->j_flags & JBD2_NO_CLEANUP) {
  85 +               jbd2_journal_destroy_checkpoint(journal);
  86 +               journal->j_checkpoint_transactions = NULL;
  87 +       }
  88 +
  89         /* Force any old transactions to disk */
  90
  91         /* Totally anal locking here... */
  92 @@ -1751,7 +1756,9 @@ int jbd2_journal_destroy(journal_t *journal)
  93         spin_unlock(&journal->j_list_lock);
  94
  95         if (journal->j_sb_buffer) {
  96 -               if (!is_journal_aborted(journal)) {
  97 +               if (is_journal_aborted(journal))
  98 +                       err = -EIO;
  99 +               else if ((journal->j_flags & JBD2_NO_CLEANUP) == 0) {
 100                         mutex_lock_io(&journal->j_checkpoint_mutex);
 101
 102                         write_lock(&journal->j_state_lock);
 103 @@ -1762,8 +1769,7 @@ int jbd2_journal_destroy(journal_t *journal)
 104                         jbd2_mark_journal_empty(journal,
 105                                         REQ_SYNC | REQ_PREFLUSH | REQ_FUA);
 106                         mutex_unlock(&journal->j_checkpoint_mutex);
 107 -               } else
 108 -                       err = -EIO;
 109 +               }
 110                 brelse(journal->j_sb_buffer);
 111         }
 112
 113 diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
 114 index 296d1e0ea87b..58ec2b764abd 100644
 115 --- a/include/linux/jbd2.h
 116 +++ b/include/linux/jbd2.h
 117 @@ -1130,6 +1130,7 @@ JBD2_FEATURE_INCOMPAT_FUNCS(csum3,                CSUM_V3)
 118                                                  * data write error in ordered
 119                                                  * mode */
 120  #define JBD2_REC_ERR   0x080   /* The errno in the sb has been recorded */
 121 +#define JBD2_NO_CLEANUP        0x100   /* Don't flush empty the journal on shutdown  */
 122
 123  /*
 124   * Function declarations for the journaling transaction and buffer