fs/ext4/ext4_jbd2.c

   1 /*
   2  * Interface between ext4 and JBD
   3  */
   4
   5 #include "ext4_jbd2.h"
   6
   7 #include <trace/events/ext4.h>
   8
   9 int __ext4_journal_get_write_access(const char *where, unsigned int line,
  10                                     handle_t *handle, struct buffer_head *bh)
  11 {
  12         int err = 0;
  13
  14         if (ext4_handle_valid(handle)) {
  15                 err = jbd2_journal_get_write_access(handle, bh);
  16                 if (err)
  17                         ext4_journal_abort_handle(where, line, __func__, bh,
  18                                                   handle, err);
  19         }
  20         return err;
  21 }
  22
  23 /*
  24  * The ext4 forget function must perform a revoke if we are freeing data
  25  * which has been journaled.  Metadata (eg. indirect blocks) must be
  26  * revoked in all cases.
  27  *
  28  * "bh" may be NULL: a metadata block may have been freed from memory
  29  * but there may still be a record of it in the journal, and that record
  30  * still needs to be revoked.
  31  *
  32  * If the handle isn't valid we're not journaling, but we still need to
  33  * call into ext4_journal_revoke() to put the buffer head.
  34  */
  35 int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
  36                   int is_metadata, struct inode *inode,
  37                   struct buffer_head *bh, ext4_fsblk_t blocknr)
  38 {
  39         int err;
  40
  41         might_sleep();
  42
  43         trace_ext4_forget(inode, is_metadata, blocknr);
  44         BUFFER_TRACE(bh, "enter");
  45
  46         jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
  47                   "data mode %x\n",
  48                   bh, is_metadata, inode->i_mode,
  49                   test_opt(inode->i_sb, DATA_FLAGS));
  50
  51         /* In the no journal case, we can just do a bforget and return */
  52         if (!ext4_handle_valid(handle)) {
  53                 bforget(bh);
  54                 return 0;
  55         }
  56
  57         /* Never use the revoke function if we are doing full data
  58          * journaling: there is no need to, and a V1 superblock won't
  59          * support it.  Otherwise, only skip the revoke on un-journaled
  60          * data blocks. */
  61
  62         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
  63             (!is_metadata && !ext4_should_journal_data(inode))) {
  64                 if (bh) {
  65                         BUFFER_TRACE(bh, "call jbd2_journal_forget");
  66                         err = jbd2_journal_forget(handle, bh);
  67                         if (err)
  68                                 ext4_journal_abort_handle(where, line, __func__,
  69                                                           bh, handle, err);
  70                         return err;
  71                 }
  72                 return 0;
  73         }
  74
  75         /*
  76          * data!=journal && (is_metadata || should_journal_data(inode))
  77          */
  78         BUFFER_TRACE(bh, "call jbd2_journal_revoke");
  79         err = jbd2_journal_revoke(handle, blocknr, bh);
  80         if (err) {
  81                 ext4_journal_abort_handle(where, line, __func__,
  82                                           bh, handle, err);
  83                 __ext4_abort(inode->i_sb, where, line,
  84                            "error %d when attempting revoke", err);
  85         }
  86         BUFFER_TRACE(bh, "exit");
  87         return err;
  88 }
  89
  90 int __ext4_journal_get_create_access(const char *where, unsigned int line,
  91                                 handle_t *handle, struct buffer_head *bh)
  92 {
  93         int err = 0;
  94
  95         if (ext4_handle_valid(handle)) {
  96                 err = jbd2_journal_get_create_access(handle, bh);
  97                 if (err)
  98                         ext4_journal_abort_handle(where, line, __func__,
  99                                                   bh, handle, err);
 100         }
 101         return err;
 102 }
 103
 104 int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
 105                                  handle_t *handle, struct inode *inode,
 106                                  struct buffer_head *bh)
 107 {
 108         int err = 0;
 109
 110         if (ext4_handle_valid(handle)) {
 111                 err = jbd2_journal_dirty_metadata(handle, bh);
 112                 if (err) {
 113                         /* Errors can only happen if there is a bug */
 114                         handle->h_err = err;
 115                         __ext4_journal_stop(where, line, handle);
 116                 }
 117         } else {
 118                 if (inode)
 119                         mark_buffer_dirty_inode(bh, inode);
 120                 else
 121                         mark_buffer_dirty(bh);
 122                 if (inode && inode_needs_sync(inode)) {
 123                         sync_dirty_buffer(bh);
 124                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
 125                                 struct ext4_super_block *es;
 126
 127                                 es = EXT4_SB(inode->i_sb)->s_es;
 128                                 es->s_last_error_block =
 129                                         cpu_to_le64(bh->b_blocknr);
 130                                 ext4_error_inode(inode, where, line,
 131                                                  bh->b_blocknr,
 132                                         "IO error syncing itable block");
 133                                 err = -EIO;
 134                         }
 135                 }
 136         }
 137         return err;
 138 }
 139
 140 int __ext4_handle_dirty_super(const char *where, unsigned int line,
 141                               handle_t *handle, struct super_block *sb,
 142                               int now)
 143 {
 144         struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
 145         int err = 0;
 146
 147         if (ext4_handle_valid(handle)) {
 148                 ext4_superblock_csum_set(sb,
 149                                 (struct ext4_super_block *)bh->b_data);
 150                 err = jbd2_journal_dirty_metadata(handle, bh);
 151                 if (err)
 152                         ext4_journal_abort_handle(where, line, __func__,
 153                                                   bh, handle, err);
 154         } else if (now) {
 155                 ext4_superblock_csum_set(sb,
 156                                 (struct ext4_super_block *)bh->b_data);
 157                 mark_buffer_dirty(bh);
 158         } else
 159                 sb->s_dirt = 1;
 160         return err;
 161 }