+
+/*
+ * Make sure that the given range of the data fork of the temporary file is
+ * mapped to written blocks. The caller must ensure that both inodes are
+ * joined to the transaction.
+ */
+int
+xrep_tempfile_prealloc(
+ struct xfs_scrub *sc,
+ xfs_fileoff_t off,
+ xfs_filblks_t len)
+{
+ struct xfs_bmbt_irec map;
+ xfs_fileoff_t end = off + len;
+ int error;
+
+ ASSERT(sc->tempip != NULL);
+ ASSERT(!XFS_NOT_DQATTACHED(sc->mp, sc->tempip));
+
+ for (; off < end; off = map.br_startoff + map.br_blockcount) {
+ int nmaps = 1;
+
+ /*
+ * If we have a real extent mapping this block then we're
+ * in ok shape.
+ */
+ error = xfs_bmapi_read(sc->tempip, off, end - off, &map, &nmaps,
+ XFS_DATA_FORK);
+ if (error)
+ return error;
+ if (nmaps == 0) {
+ ASSERT(nmaps != 0);
+ return -EFSCORRUPTED;
+ }
+
+ if (xfs_bmap_is_written_extent(&map))
+ continue;
+
+ /*
+ * If we find a delalloc reservation then something is very
+ * very wrong. Bail out.
+ */
+ if (map.br_startblock == DELAYSTARTBLOCK)
+ return -EFSCORRUPTED;
+
+ /*
+ * Make sure this block has a real zeroed extent allocated to
+ * it.
+ */
+ nmaps = 1;
+ error = xfs_bmapi_write(sc->tp, sc->tempip, off, end - off,
+ XFS_BMAPI_CONVERT | XFS_BMAPI_ZERO, 0, &map,
+ &nmaps);
+ if (error)
+ return error;
+ if (nmaps != 1)
+ return -EFSCORRUPTED;
+
+ trace_xrep_tempfile_prealloc(sc, XFS_DATA_FORK, &map);
+
+ /* Commit new extent and all deferred work. */
+ error = xfs_defer_finish(&sc->tp);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
+
+/*
+ * Write data to each block of a file. The given range of the tempfile's data
+ * fork must already be populated with written extents.
+ */
+int
+xrep_tempfile_copyin(
+ struct xfs_scrub *sc,
+ xfs_fileoff_t off,
+ xfs_filblks_t len,
+ xrep_tempfile_copyin_fn prep_fn,
+ void *data)
+{
+ LIST_HEAD(buffers_list);
+ struct xfs_mount *mp = sc->mp;
+ struct xfs_buf *bp;
+ xfs_fileoff_t flush_mask;
+ xfs_fileoff_t end = off + len;
+ loff_t pos = XFS_FSB_TO_B(mp, off);
+ int error = 0;
+
+ ASSERT(S_ISREG(VFS_I(sc->tempip)->i_mode));
+
+ /* Flush buffers to disk every 512K */
+ flush_mask = XFS_B_TO_FSBT(mp, (1U << 19)) - 1;
+
+ for (; off < end; off++, pos += mp->m_sb.sb_blocksize) {
+ struct xfs_bmbt_irec map;
+ int nmaps = 1;
+
+ /* Read block mapping for this file block. */
+ error = xfs_bmapi_read(sc->tempip, off, 1, &map, &nmaps, 0);
+ if (error)
+ goto out_err;
+ if (nmaps == 0 || !xfs_bmap_is_written_extent(&map)) {
+ error = -EFSCORRUPTED;
+ goto out_err;
+ }
+
+ /* Get the metadata buffer for this offset in the file. */
+ error = xfs_trans_get_buf(sc->tp, mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(mp, map.br_startblock),
+ mp->m_bsize, 0, &bp);
+ if (error)
+ goto out_err;
+
+ trace_xrep_tempfile_copyin(sc, XFS_DATA_FORK, &map);
+
+ /* Read in a block's worth of data from the xfile. */
+ error = prep_fn(sc, bp, data);
+ if (error) {
+ xfs_trans_brelse(sc->tp, bp);
+ goto out_err;
+ }
+
+ /* Queue buffer, and flush if we have too much dirty data. */
+ xfs_buf_delwri_queue_here(bp, &buffers_list);
+ xfs_trans_brelse(sc->tp, bp);
+
+ if (!(off & flush_mask)) {
+ error = xfs_buf_delwri_submit(&buffers_list);
+ if (error)
+ goto out_err;
+ }
+ }
+
+ /*
+ * Write the new blocks to disk. If the ordered list isn't empty after
+ * that, then something went wrong and we have to fail. This should
+ * never happen, but we'll check anyway.
+ */
+ error = xfs_buf_delwri_submit(&buffers_list);
+ if (error)
+ goto out_err;
+
+ if (!list_empty(&buffers_list)) {
+ ASSERT(list_empty(&buffers_list));
+ error = -EIO;
+ goto out_err;
+ }
+
+ return 0;
+
+out_err:
+ xfs_buf_delwri_cancel(&buffers_list);
+ return error;
+}
+
+/*
+ * Set the temporary file's size. Caller must join the tempfile to the scrub
+ * transaction and is responsible for adjusting block mappings as needed.
+ */
+int
+xrep_tempfile_set_isize(
+ struct xfs_scrub *sc,
+ unsigned long long isize)
+{
+ if (sc->tempip->i_disk_size == isize)
+ return 0;
+
+ sc->tempip->i_disk_size = isize;
+ i_size_write(VFS_I(sc->tempip), isize);
+ return xrep_tempfile_roll_trans(sc);
+}
+
+/*
+ * Roll a repair transaction involving the temporary file. Caller must join
+ * both the temporary file and the file being scrubbed to the transaction.
+ * This function return with both inodes joined to a new scrub transaction,
+ * or the usual negative errno.
+ */
+int
+xrep_tempfile_roll_trans(
+ struct xfs_scrub *sc)
+{
+ int error;
+
+ xfs_trans_log_inode(sc->tp, sc->tempip, XFS_ILOG_CORE);
+ error = xrep_roll_trans(sc);
+ if (error)
+ return error;
+
+ xfs_trans_ijoin(sc->tp, sc->tempip, 0);
+ return 0;
+}
projects / linux-2.6-block.git / commitdiff