linux/fs/ext4/ext4_jbd2.c
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   1/*
   2 * Interface between ext4 and JBD
   3 */
   4
   5#include "ext4_jbd2.h"
   6
   7#include <trace/events/ext4.h>
   8
   9int __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 */
  35int __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
  90int __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
 104int __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
 140int __ext4_handle_dirty_super(const char *where, unsigned int line,
 141                              handle_t *handle, struct super_block *sb)
 142{
 143        struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
 144        int err = 0;
 145
 146        ext4_superblock_csum_set(sb);
 147        if (ext4_handle_valid(handle)) {
 148                err = jbd2_journal_dirty_metadata(handle, bh);
 149                if (err)
 150                        ext4_journal_abort_handle(where, line, __func__,
 151                                                  bh, handle, err);
 152        } else
 153                mark_buffer_dirty(bh);
 154        return err;
 155}
 156
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