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_trans.c
  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 __unused,
  43                                 struct ext4_block *block __unused)
  44 {
  45         int r = EOK;
  46 #if CONFIG_JOURNALING_ENABLE
  47         if (fs->jbd_journal && fs->curr_trans) {
  48                 struct jbd_journal *journal = fs->jbd_journal;
  49                 struct jbd_trans *trans = fs->curr_trans;
  50                 r = jbd_trans_get_access(journal, trans, block);
  51         }
  52 #endif
  53         return r;
  54 }
  55
  56 int ext4_trans_set_block_dirty(struct ext4_buf *buf)
  57 {
  58         int r = EOK;
  59 #if CONFIG_JOURNALING_ENABLE
  60         struct ext4_fs *fs = buf->bc->bdev->fs;
  61         struct ext4_block block = {
  62                 .lb_id = buf->lba,
  63                 .data = buf->data,
  64                 .buf = buf
  65         };
  66
  67         if (fs->jbd_journal && fs->curr_trans) {
  68                 struct jbd_trans *trans = fs->curr_trans;
  69                 return jbd_trans_set_block_dirty(trans, &block);
  70         }
  71 #endif
  72         ext4_bcache_set_dirty(buf);
  73         return r;
  74 }
  75
  76 int ext4_trans_block_get_noread(struct ext4_blockdev *bdev,
  77                           struct ext4_block *b,
  78                           uint64_t lba)
  79 {
  80         int r = ext4_block_get_noread(bdev, b, lba);
  81         if (r != EOK)
  82                 return r;
  83
  84         r = ext4_trans_get_write_access(bdev->fs, b);
  85         if (r != EOK)
  86                 ext4_block_set(bdev, b);
  87
  88         return r;
  89 }
  90
  91 int ext4_trans_block_get(struct ext4_blockdev *bdev,
  92                    struct ext4_block *b,
  93                    uint64_t lba)
  94 {
  95         int r = ext4_block_get(bdev, b, lba);
  96         if (r != EOK)
  97                 return r;
  98
  99         r = ext4_trans_get_write_access(bdev->fs, b);
 100         if (r != EOK)
 101                 ext4_block_set(bdev, b);
 102
 103         return r;
 104 }
 105
 106 int ext4_trans_try_revoke_block(struct ext4_blockdev *bdev __unused,
 107                                 uint64_t lba __unused)
 108 {
 109         int r = EOK;
 110 #if CONFIG_JOURNALING_ENABLE
 111         struct ext4_fs *fs = bdev->fs;
 112         if (fs->jbd_journal && fs->curr_trans) {
 113                 struct jbd_trans *trans = fs->curr_trans;
 114                 r = jbd_trans_try_revoke_block(trans, lba);
 115         } else if (fs->jbd_journal) {
 116                 r = ext4_block_flush_lba(fs->bdev, lba);
 117         }
 118 #endif
 119         return r;
 120 }
 121
 122 /**
 123  * @}
 124  */