STATIC uint xfs_buf_item_push( struct xfs_log_item *lip, struct list_head *buffer_list) { struct xfs_buf_log_item *bip = BUF_ITEM(lip); struct xfs_buf *bp = bip->bli_buf; uint rval = XFS_ITEM_SUCCESS; if (xfs_buf_ispinned(bp)) return XFS_ITEM_PINNED; if (!xfs_buf_trylock(bp)) { /* * If we have just raced with a buffer being pinned and it has * been marked stale, we could end up stalling until someone else * issues a log force to unpin the stale buffer. Check for the * race condition here so xfsaild recognizes the buffer is pinned * and queues a log force to move it along. */ if (xfs_buf_ispinned(bp)) return XFS_ITEM_PINNED; return XFS_ITEM_LOCKED; } ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); trace_xfs_buf_item_push(bip); if (!xfs_buf_delwri_queue(bp, buffer_list)) rval = XFS_ITEM_FLUSHING; xfs_buf_unlock(bp); return rval; }
/* * Second stage of a quiesce. The data is already synced, now we have to take * care of the metadata. New transactions are already blocked, so we need to * wait for any remaining transactions to drain out before proceeding. */ void xfs_quiesce_attr( struct xfs_mount *mp) { int error = 0; /* wait for all modifications to complete */ while (atomic_read(&mp->m_active_trans) > 0) delay(100); /* reclaim inodes to do any IO before the freeze completes */ xfs_reclaim_inodes(mp, 0); xfs_reclaim_inodes(mp, SYNC_WAIT); /* flush all pending changes from the AIL */ xfs_ail_push_all_sync(mp->m_ail); /* * Just warn here till VFS can correctly support * read-only remount without racing. */ WARN_ON(atomic_read(&mp->m_active_trans) != 0); /* Push the superblock and write an unmount record */ error = xfs_log_sbcount(mp); if (error) xfs_warn(mp, "xfs_attr_quiesce: failed to log sb changes. " "Frozen image may not be consistent."); xfs_log_unmount_write(mp); /* * At this point we might have modified the superblock again and thus * added an item to the AIL, thus flush it again. */ xfs_ail_push_all_sync(mp->m_ail); /* * The superblock buffer is uncached and xfsaild_push() will lock and * set the XBF_ASYNC flag on the buffer. We cannot do xfs_buf_iowait() * here but a lock on the superblock buffer will block until iodone() * has completed. */ xfs_buf_lock(mp->m_sb_bp); xfs_buf_unlock(mp->m_sb_bp); }
STATIC uint xfs_buf_item_push( struct xfs_log_item *lip, struct list_head *buffer_list) { struct xfs_buf_log_item *bip = BUF_ITEM(lip); struct xfs_buf *bp = bip->bli_buf; uint rval = XFS_ITEM_SUCCESS; if (xfs_buf_ispinned(bp)) return XFS_ITEM_PINNED; if (!xfs_buf_trylock(bp)) { /* * If we have just raced with a buffer being pinned and it has * been marked stale, we could end up stalling until someone else * issues a log force to unpin the stale buffer. Check for the * race condition here so xfsaild recognizes the buffer is pinned * and queues a log force to move it along. */ if (xfs_buf_ispinned(bp)) return XFS_ITEM_PINNED; return XFS_ITEM_LOCKED; } ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); trace_xfs_buf_item_push(bip); /* has a previous flush failed due to IO errors? */ if ((bp->b_flags & XBF_WRITE_FAIL) && ___ratelimit(&xfs_buf_write_fail_rl_state, "XFS:")) { xfs_warn(bp->b_target->bt_mount, "Detected failing async write on buffer block 0x%llx. Retrying async write.\n", (long long)bp->b_bn); } if (!xfs_buf_delwri_queue(bp, buffer_list)) rval = XFS_ITEM_FLUSHING; xfs_buf_unlock(bp); return rval; }
STATIC uint xfs_buf_item_push( struct xfs_log_item *lip, struct list_head *buffer_list) { struct xfs_buf_log_item *bip = BUF_ITEM(lip); struct xfs_buf *bp = bip->bli_buf; uint rval = XFS_ITEM_SUCCESS; if (xfs_buf_ispinned(bp)) return XFS_ITEM_PINNED; if (!xfs_buf_trylock(bp)) return XFS_ITEM_LOCKED; ASSERT(!(bip->bli_flags & XFS_BLI_STALE)); trace_xfs_buf_item_push(bip); if (!xfs_buf_delwri_queue(bp, buffer_list)) rval = XFS_ITEM_FLUSHING; xfs_buf_unlock(bp); return rval; }
/* * 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; }