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 int __ext4_journal_forget(const char *where, handle_t *handle,
  38                                 struct buffer_head *bh)
  39 {
  40         int err = 0;
  41
  42         if (ext4_handle_valid(handle)) {
  43                 err = jbd2_journal_forget(handle, bh);
  44                 if (err)
  45                         ext4_journal_abort_handle(where, __func__, bh,
  46                                                   handle, err);
  47         }
  48         else
  49                 bforget(bh);
  50         return err;
  51 }
  52
  53 int __ext4_journal_revoke(const char *where, handle_t *handle,
  54                                 ext4_fsblk_t blocknr, struct buffer_head *bh)
  55 {
  56         int err = 0;
  57
  58         if (ext4_handle_valid(handle)) {
  59                 err = jbd2_journal_revoke(handle, blocknr, bh);
  60                 if (err)
  61                         ext4_journal_abort_handle(where, __func__, bh,
  62                                                   handle, err);
  63         }
  64         else
  65                 bforget(bh);
  66         return err;
  67 }
  68
  69 /*
  70  * The ext4 forget function must perform a revoke if we are freeing data
  71  * which has been journaled.  Metadata (eg. indirect blocks) must be
  72  * revoked in all cases.
  73  *
  74  * "bh" may be NULL: a metadata block may have been freed from memory
  75  * but there may still be a record of it in the journal, and that record
  76  * still needs to be revoked.
  77  *
  78  * If the handle isn't valid we're not journaling, but we still need to
  79  * call into ext4_journal_revoke() to put the buffer head.
  80  */
  81 int __ext4_forget(const char *where, handle_t *handle, int is_metadata,
  82                   struct inode *inode, struct buffer_head *bh,
  83                   ext4_fsblk_t blocknr)
  84 {
  85         int err;
  86
  87         might_sleep();
  88
  89         trace_ext4_forget(inode, is_metadata, blocknr);
  90         BUFFER_TRACE(bh, "enter");
  91
  92         jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
  93                   "data mode %x\n",
  94                   bh, is_metadata, inode->i_mode,
  95                   test_opt(inode->i_sb, DATA_FLAGS));
  96
  97         /* Never use the revoke function if we are doing full data
  98          * journaling: there is no need to, and a V1 superblock won't
  99          * support it.  Otherwise, only skip the revoke on un-journaled
 100          * data blocks. */
 101
 102         if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
 103             (!is_metadata && !ext4_should_journal_data(inode))) {
 104                 if (bh) {
 105                         BUFFER_TRACE(bh, "call jbd2_journal_forget");
 106                         return __ext4_journal_forget(where, handle, bh);
 107                 }
 108                 return 0;
 109         }
 110
 111         /*
 112          * data!=journal && (is_metadata || should_journal_data(inode))
 113          */
 114         BUFFER_TRACE(bh, "call ext4_journal_revoke");
 115         err = __ext4_journal_revoke(where, handle, blocknr, bh);
 116         if (err)
 117                 ext4_abort(inode->i_sb, __func__,
 118                            "error %d when attempting revoke", err);
 119         BUFFER_TRACE(bh, "exit");
 120         return err;
 121 }
 122
 123 int __ext4_journal_get_create_access(const char *where,
 124                                 handle_t *handle, struct buffer_head *bh)
 125 {
 126         int err = 0;
 127
 128         if (ext4_handle_valid(handle)) {
 129                 err = jbd2_journal_get_create_access(handle, bh);
 130                 if (err)
 131                         ext4_journal_abort_handle(where, __func__, bh,
 132                                                   handle, err);
 133         }
 134         return err;
 135 }
 136
 137 int __ext4_handle_dirty_metadata(const char *where, handle_t *handle,
 138                                  struct inode *inode, struct buffer_head *bh)
 139 {
 140         int err = 0;
 141
 142         if (ext4_handle_valid(handle)) {
 143                 err = jbd2_journal_dirty_metadata(handle, bh);
 144                 if (err)
 145                         ext4_journal_abort_handle(where, __func__, bh,
 146                                                   handle, err);
 147         } else {
 148                 if (inode && bh)
 149                         mark_buffer_dirty_inode(bh, inode);
 150                 else
 151                         mark_buffer_dirty(bh);
 152                 if (inode && inode_needs_sync(inode)) {
 153                         sync_dirty_buffer(bh);
 154                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
 155                                 ext4_error(inode->i_sb, __func__,
 156                                            "IO error syncing inode, "
 157                                            "inode=%lu, block=%llu",
 158                                            inode->i_ino,
 159                                            (unsigned long long) bh->b_blocknr);
 160                                 err = -EIO;
 161                         }
 162                 }
 163         }
 164         return err;
 165 }