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_undo_access(const char *where, handle_t *handle,
  10                                 struct buffer_head *bh)
  11 {
  12         int err = 0;
  13
  14         if (ext4_handle_valid(handle)) {
  15                 err = jbd2_journal_get_undo_access(handle, bh);
  16                 if (err)
  17                         ext4_journal_abort_handle(where, __func__, bh,
  18                                                   handle, err);
  19         }
  20         return err;
  21 }
  22
  23 int __ext4_journal_get_write_access(const char *where, handle_t *handle,
  24                                 struct buffer_head *bh)
  25 {
  26         int err = 0;
  27
  28         if (ext4_handle_valid(handle)) {
  29                 err = jbd2_journal_get_write_access(handle, bh);
  30                 if (err)
  31                         ext4_journal_abort_handle(where, __func__, bh,
  32                                                   handle, err);
  33         }
  34         return err;
  35 }
  36
  37 /*
  38  * The ext4 forget function must perform a revoke if we are freeing data
  39  * which has been journaled.  Metadata (eg. indirect blocks) must be
  40  * revoked in all cases.
  41  *
  42  * "bh" may be NULL: a metadata block may have been freed from memory
  43  * but there may still be a record of it in the journal, and that record
  44  * still needs to be revoked.
  45  *
  46  * If the handle isn't valid we're not journaling, but we still need to
  47  * call into ext4_journal_revoke() to put the buffer head.
  48  */
  49 int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
  50                   struct inode *inode, struct buffer_head *bh,
  51                   ext4_fsblk_t blocknr)
  52 {
  53         int err;
  54
  55         might_sleep();
  56
  57         trace_ext4_forget(inode, is_metadata, blocknr);
  58         BUFFER_TRACE(bh, "enter");
  59
  60         jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
  61                   "data mode %x\n",
  62                   bh, is_metadata, inode->i_mode,
  63                   test_opt(inode->i_sb, DATA_FLAGS));
  64
  65         /* In the no journal case, we can just do a bforget and return */
  66         if (!ext4_handle_valid(handle)) {
  67                 bforget(bh);
  68                 return 0;
  69         }
  70
  71         /* Never use the revoke function if we are doing full data
  72          * journaling: there is no need to, and a V1 superblock won't
  73          * support it.  Otherwise, only skip the revoke on un-journaled
  74          * data blocks. */
  75
  76         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
  77             (!is_metadata && !ext4_should_journal_data(inode))) {
  78                 if (bh) {
  79                         BUFFER_TRACE(bh, "call jbd2_journal_forget");
  80                         err = jbd2_journal_forget(handle, bh);
  81                         if (err)
  82                                 ext4_journal_abort_handle(where, __func__, bh,
  83                                                           handle, err);
  84                         return err;
  85                 }
  86                 return 0;
  87         }
  88
  89         /*
  90          * data!=journal && (is_metadata || should_journal_data(inode))
  91          */
  92         BUFFER_TRACE(bh, "call jbd2_journal_revoke");
  93         err = jbd2_journal_revoke(handle, blocknr, bh);
  94         if (err) {
  95                 ext4_journal_abort_handle(where, __func__, bh, handle, err);
  96                 ext4_abort(inode->i_sb, __func__,
  97                            "error %d when attempting revoke", err);
  98         }
  99         BUFFER_TRACE(bh, "exit");
 100         return err;
 101 }
 102
 103 int __ext4_journal_get_create_access(const char *where,
 104                                 handle_t *handle, struct buffer_head *bh)
 105 {
 106         int err = 0;
 107
 108         if (ext4_handle_valid(handle)) {
 109                 err = jbd2_journal_get_create_access(handle, bh);
 110                 if (err)
 111                         ext4_journal_abort_handle(where, __func__, bh,
 112                                                   handle, err);
 113         }
 114         return err;
 115 }
 116
 117 int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
 118                                  struct inode *inode, struct buffer_head *bh)
 119 {
 120         int err = 0;
 121
 122         if (ext4_handle_valid(handle)) {
 123                 err = jbd2_journal_dirty_metadata(handle, bh);
 124                 if (err)
 125                         ext4_journal_abort_handle(where, __func__, bh,
 126                                                   handle, err);
 127         } else {
 128                 if (inode)
 129                         mark_buffer_dirty_inode(bh, inode);
 130                 else
 131                         mark_buffer_dirty(bh);
 132                 if (inode && inode_needs_sync(inode)) {
 133                         sync_dirty_buffer(bh);
 134                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
 135                                 ext4_error(inode->i_sb,
 136                                            "IO error syncing inode, "
 137                                            "inode=%lu, block=%llu",
 138                                            inode->i_ino,
 139                                            (unsigned long long) bh->b_blocknr);
 140                                 err = -EIO;
 141                         }
 142                 }
 143         }
 144         return err;
 145 }