lwext4/ext4_trans.c

   1 /*
   2  * Copyright (c) 2015 Grzegorz Kostka (kostka.grzegorz@gmail.com)
   3  * Copyright (c) 2015 Kaho Ng (ngkaho1234@gmail.com)
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * - Redistributions of source code must retain the above copyright
  11  *   notice, this list of conditions and the following disclaimer.
  12  * - Redistributions in binary form must reproduce the above copyright
  13  *   notice, this list of conditions and the following disclaimer in the
  14  *   documentation and/or other materials provided with the distribution.
  15  * - The name of the author may not be used to endorse or promote products
  16  *   derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 /** @addtogroup lwext4
  31  * @{
  32  */
  33 /**
  34  * @file  ext4.h
  35  * @brief Ext4 transaction buffer operations.
  36  */
  37
  38 #include "ext4_config.h"
  39 #include "ext4_types.h"
  40 #include "ext4_journal.h"
  41
  42 static int ext4_trans_get_write_access(struct ext4_fs *fs,
  43                                 struct ext4_block *block)
  44 {
  45         int r = EOK;
  46         if (fs->jbd_journal && fs->curr_trans) {
  47                 struct jbd_journal *journal = fs->jbd_journal;
  48                 struct jbd_trans *trans = fs->curr_trans;
  49                 r = jbd_trans_get_access(journal, trans, block);
  50         }
  51         return r;
  52 }
  53
  54 int ext4_trans_set_block_dirty(struct ext4_buf *buf)
  55 {
  56         int r = EOK;
  57         struct ext4_fs *fs = buf->bc->bdev->fs;
  58         struct ext4_block block = {
  59                 .lb_id = buf->lba,
  60                 .data = buf->data,
  61                 .buf = buf
  62         };
  63
  64         if (fs->jbd_journal && fs->curr_trans) {
  65                 struct jbd_trans *trans = fs->curr_trans;
  66                 r = jbd_trans_set_block_dirty(trans, &block);
  67         } else
  68                 ext4_bcache_set_dirty(buf);
  69
  70         return r;
  71 }
  72
  73 int ext4_trans_block_get_noread(struct ext4_blockdev *bdev,
  74                           struct ext4_block *b,
  75                           uint64_t lba)
  76 {
  77         int r = ext4_block_get_noread(bdev, b, lba);
  78         if (r != EOK)
  79                 return r;
  80
  81         if((r = ext4_trans_get_write_access(bdev->fs, b)) != EOK)
  82                 ext4_block_set(bdev, b);
  83
  84         return r;
  85 }
  86
  87 int ext4_trans_block_get(struct ext4_blockdev *bdev,
  88                    struct ext4_block *b,
  89                    uint64_t lba)
  90 {
  91         int r = ext4_block_get(bdev, b, lba);
  92         if (r != EOK)
  93                 return r;
  94
  95         if((r = ext4_trans_get_write_access(bdev->fs, b)) != EOK)
  96                 ext4_block_set(bdev, b);
  97
  98         return r;
  99 }
 100
 101 int ext4_trans_try_revoke_block(struct ext4_blockdev *bdev,
 102                                uint64_t lba)
 103 {
 104         int r = EOK;
 105         struct ext4_fs *fs = bdev->fs;
 106         if (fs->jbd_journal && fs->curr_trans) {
 107                 struct jbd_trans *trans = fs->curr_trans;
 108                 jbd_trans_try_revoke_block(trans, lba);
 109         }
 110         return r;
 111 }
 112
 113 /**
 114  * @}
 115  */