release/src-rt-6.x.4708/linux/linux-2.6.36/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, 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_undo_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 int __ext4_journal_get_write_access(const char *where, unsigned int line,
  24                                     handle_t *handle, 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, line, __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, unsigned int line, handle_t *handle,
  50                   int is_metadata, struct inode *inode,
  51                   struct buffer_head *bh, 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, line, __func__,
  83                                                           bh, 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, line, __func__,
  96                                           bh, handle, err);
  97                 __ext4_abort(inode->i_sb, where, line,
  98                            "error %d when attempting revoke", err);
  99         }
 100         BUFFER_TRACE(bh, "exit");
 101         return err;
 102 }
 103
 104 int __ext4_journal_get_create_access(const char *where, unsigned int line,
 105                                 handle_t *handle, struct buffer_head *bh)
 106 {
 107         int err = 0;
 108
 109         if (ext4_handle_valid(handle)) {
 110                 err = jbd2_journal_get_create_access(handle, bh);
 111                 if (err)
 112                         ext4_journal_abort_handle(where, line, __func__,
 113                                                   bh, handle, err);
 114         }
 115         return err;
 116 }
 117
 118 int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
 119                                  handle_t *handle, struct inode *inode,
 120                                  struct buffer_head *bh)
 121 {
 122         int err = 0;
 123
 124         if (ext4_handle_valid(handle)) {
 125                 err = jbd2_journal_dirty_metadata(handle, bh);
 126                 if (err)
 127                         ext4_journal_abort_handle(where, line, __func__,
 128                                                   bh, handle, err);
 129         } else {
 130                 if (inode)
 131                         mark_buffer_dirty_inode(bh, inode);
 132                 else
 133                         mark_buffer_dirty(bh);
 134                 if (inode && inode_needs_sync(inode)) {
 135                         sync_dirty_buffer(bh);
 136                         if (buffer_req(bh) && !buffer_uptodate(bh)) {
 137                                 struct ext4_super_block *es;
 138
 139                                 es = EXT4_SB(inode->i_sb)->s_es;
 140                                 es->s_last_error_block =
 141                                         cpu_to_le64(bh->b_blocknr);
 142                                 ext4_error_inode(inode, where, line,
 143                                                  bh->b_blocknr,
 144                                         "IO error syncing itable block");
 145                                 err = -EIO;
 146                         }
 147                 }
 148         }
 149         return err;
 150 }
 151
 152 int __ext4_handle_dirty_super(const char *where, unsigned int line,
 153                               handle_t *handle, struct super_block *sb)
 154 {
 155         struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
 156         int err = 0;
 157
 158         if (ext4_handle_valid(handle)) {
 159                 err = jbd2_journal_dirty_metadata(handle, bh);
 160                 if (err)
 161                         ext4_journal_abort_handle(where, line, __func__,
 162                                                   bh, handle, err);
 163         } else
 164                 sb->s_dirt = 1;
 165         return err;
 166 }