/* * Called when we want to stop a buffer from getting written or read. * We attach the EIO error, muck with its flags, and call biodone * so that the proper iodone callbacks get called. */ int xfs_bioerror( xfs_buf_t *bp) { #ifdef XFSERRORDEBUG ASSERT(XFS_BUF_ISREAD(bp) || bp->b_iodone); #endif /* * No need to wait until the buffer is unpinned. * We aren't flushing it. */ xfs_buftrace("XFS IOERROR", bp); XFS_BUF_ERROR(bp, EIO); /* * We're calling biodone, so delete B_DONE flag. Either way * we have to call the iodone callback, and calling biodone * probably is the best way since it takes care of * GRIO as well. */ XFS_BUF_UNREAD(bp); XFS_BUF_UNDELAYWRITE(bp); XFS_BUF_UNDONE(bp); XFS_BUF_STALE(bp); XFS_BUF_CLR_BDSTRAT_FUNC(bp); xfs_biodone(bp); return (EIO); }
/* * Same as xfs_bioerror, except that we are releasing the buffer * here ourselves, and avoiding the biodone call. * This is meant for userdata errors; metadata bufs come with * iodone functions attached, so that we can track down errors. */ int xfs_bioerror_relse( xfs_buf_t *bp) { int64_t fl; ASSERT(XFS_BUF_IODONE_FUNC(bp) != xfs_buf_iodone_callbacks); ASSERT(XFS_BUF_IODONE_FUNC(bp) != xlog_iodone); xfs_buftrace("XFS IOERRELSE", bp); fl = XFS_BUF_BFLAGS(bp); /* * No need to wait until the buffer is unpinned. * We aren't flushing it. * * chunkhold expects B_DONE to be set, whether * we actually finish the I/O or not. We don't want to * change that interface. */ XFS_BUF_UNREAD(bp); XFS_BUF_UNDELAYWRITE(bp); XFS_BUF_DONE(bp); XFS_BUF_STALE(bp); XFS_BUF_CLR_IODONE_FUNC(bp); XFS_BUF_CLR_BDSTRAT_FUNC(bp); if (!(fl & XFS_B_ASYNC)) { /* * Mark b_error and B_ERROR _both_. * Lot's of chunkcache code assumes that. * There's no reason to mark error for * ASYNC buffers. */ XFS_BUF_ERROR(bp, EIO); XFS_BUF_V_IODONESEMA(bp); } else { xfs_buf_relse(bp); } return (EIO); }
/* * Zero file bytes between startoff and endoff inclusive. * The iolock is held exclusive and no blocks are buffered. * * This function is used by xfs_free_file_space() to zero * partial blocks when the range to free is not block aligned. * When unreserving space with boundaries that are not block * aligned we round up the start and round down the end * boundaries and then use this function to zero the parts of * the blocks that got dropped during the rounding. */ STATIC int xfs_zero_remaining_bytes( xfs_inode_t *ip, xfs_off_t startoff, xfs_off_t endoff) { xfs_bmbt_irec_t imap; xfs_fileoff_t offset_fsb; xfs_off_t lastoffset; xfs_off_t offset; xfs_buf_t *bp; xfs_mount_t *mp = ip->i_mount; int nimap; int error = 0; /* * Avoid doing I/O beyond eof - it's not necessary * since nothing can read beyond eof. The space will * be zeroed when the file is extended anyway. */ if (startoff >= XFS_ISIZE(ip)) return 0; if (endoff > XFS_ISIZE(ip)) endoff = XFS_ISIZE(ip); bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ? mp->m_rtdev_targp : mp->m_ddev_targp, BTOBB(mp->m_sb.sb_blocksize), 0); if (!bp) return XFS_ERROR(ENOMEM); xfs_buf_unlock(bp); for (offset = startoff; offset <= endoff; offset = lastoffset + 1) { uint lock_mode; offset_fsb = XFS_B_TO_FSBT(mp, offset); nimap = 1; lock_mode = xfs_ilock_data_map_shared(ip); error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0); xfs_iunlock(ip, lock_mode); if (error || nimap < 1) break; ASSERT(imap.br_blockcount >= 1); ASSERT(imap.br_startoff == offset_fsb); lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1; if (lastoffset > endoff) lastoffset = endoff; if (imap.br_startblock == HOLESTARTBLOCK) continue; ASSERT(imap.br_startblock != DELAYSTARTBLOCK); if (imap.br_state == XFS_EXT_UNWRITTEN) continue; XFS_BUF_UNDONE(bp); XFS_BUF_UNWRITE(bp); XFS_BUF_READ(bp); XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock)); if (XFS_FORCED_SHUTDOWN(mp)) { error = XFS_ERROR(EIO); break; } xfs_buf_iorequest(bp); error = xfs_buf_iowait(bp); if (error) { xfs_buf_ioerror_alert(bp, "xfs_zero_remaining_bytes(read)"); break; } memset(bp->b_addr + (offset - XFS_FSB_TO_B(mp, imap.br_startoff)), 0, lastoffset - offset + 1); XFS_BUF_UNDONE(bp); XFS_BUF_UNREAD(bp); XFS_BUF_WRITE(bp); if (XFS_FORCED_SHUTDOWN(mp)) { error = XFS_ERROR(EIO); break; } xfs_buf_iorequest(bp); error = xfs_buf_iowait(bp); if (error) { xfs_buf_ioerror_alert(bp, "xfs_zero_remaining_bytes(write)"); break; } } xfs_buf_free(bp); return error; }