diff options
author | Nathan Scott <nathans@sgi.com> | 2006-06-18 22:39:53 (GMT) |
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committer | Nathan Scott <nathans@sgi.com> | 2006-06-18 22:39:53 (GMT) |
commit | 1e69dd0eb354d6f1a77098a3946b5ba57d4e3109 (patch) | |
tree | f97ce9c94f72cf142831ad12a701fc6378dc279f /fs/xfs/xfs_rw.c | |
parent | 1d47bec290a6f1f366192946840efef5076d9fc7 (diff) | |
download | linux-1e69dd0eb354d6f1a77098a3946b5ba57d4e3109.tar.xz |
[XFS] Push some common code out of write path into core XFS code for
sharing.
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26248a
Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_rw.c')
-rw-r--r-- | fs/xfs/xfs_rw.c | 86 |
1 files changed, 85 insertions, 1 deletions
diff --git a/fs/xfs/xfs_rw.c b/fs/xfs/xfs_rw.c index d33e4f5..c55e281 100644 --- a/fs/xfs/xfs_rw.c +++ b/fs/xfs/xfs_rw.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. + * Copyright (c) 2000-2006 Silicon Graphics, Inc. * All Rights Reserved. * * This program is free software; you can redistribute it and/or @@ -92,6 +92,90 @@ xfs_write_clear_setuid( } /* + * Handle logging requirements of various synchronous types of write. + */ +int +xfs_write_sync_logforce( + xfs_mount_t *mp, + xfs_inode_t *ip) +{ + int error = 0; + + /* + * If we're treating this as O_DSYNC and we have not updated the + * size, force the log. + */ + if (!(mp->m_flags & XFS_MOUNT_OSYNCISOSYNC) && + !(ip->i_update_size)) { + xfs_inode_log_item_t *iip = ip->i_itemp; + + /* + * If an allocation transaction occurred + * without extending the size, then we have to force + * the log up the proper point to ensure that the + * allocation is permanent. We can't count on + * the fact that buffered writes lock out direct I/O + * writes - the direct I/O write could have extended + * the size nontransactionally, then finished before + * we started. xfs_write_file will think that the file + * didn't grow but the update isn't safe unless the + * size change is logged. + * + * Force the log if we've committed a transaction + * against the inode or if someone else has and + * the commit record hasn't gone to disk (e.g. + * the inode is pinned). This guarantees that + * all changes affecting the inode are permanent + * when we return. + */ + if (iip && iip->ili_last_lsn) { + xfs_log_force(mp, iip->ili_last_lsn, + XFS_LOG_FORCE | XFS_LOG_SYNC); + } else if (xfs_ipincount(ip) > 0) { + xfs_log_force(mp, (xfs_lsn_t)0, + XFS_LOG_FORCE | XFS_LOG_SYNC); + } + + } else { + xfs_trans_t *tp; + + /* + * O_SYNC or O_DSYNC _with_ a size update are handled + * the same way. + * + * If the write was synchronous then we need to make + * sure that the inode modification time is permanent. + * We'll have updated the timestamp above, so here + * we use a synchronous transaction to log the inode. + * It's not fast, but it's necessary. + * + * If this a dsync write and the size got changed + * non-transactionally, then we need to ensure that + * the size change gets logged in a synchronous + * transaction. + */ + tp = xfs_trans_alloc(mp, XFS_TRANS_WRITE_SYNC); + if ((error = xfs_trans_reserve(tp, 0, + XFS_SWRITE_LOG_RES(mp), + 0, 0, 0))) { + /* Transaction reserve failed */ + xfs_trans_cancel(tp, 0); + } else { + /* Transaction reserve successful */ + xfs_ilock(ip, XFS_ILOCK_EXCL); + xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); + xfs_trans_ihold(tp, ip); + xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); + xfs_trans_set_sync(tp); + error = xfs_trans_commit(tp, 0, NULL); + xfs_iunlock(ip, XFS_ILOCK_EXCL); + } + } + + return error; +} + +/* * Force a shutdown of the filesystem instantly while keeping * the filesystem consistent. We don't do an unmount here; just shutdown * the shop, make sure that absolutely nothing persistent happens to |