Date: Tue, 28 Sep 2021 03:15:10 GMT From: Kirk McKusick <mckusick@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 5c6b3e4b5dfa - stable/13 - Eliminate snaplk / bufwait LOR when creating UFS snapshots Message-ID: <202109280315.18S3FA8n042798@gitrepo.freebsd.org>
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The branch stable/13 has been updated by mckusick: URL: https://cgit.FreeBSD.org/src/commit/?id=5c6b3e4b5dfa554e7e6eb246481e654402de1ca0 commit 5c6b3e4b5dfa554e7e6eb246481e654402de1ca0 Author: Kirk McKusick <mckusick@FreeBSD.org> AuthorDate: 2021-09-18 23:51:07 +0000 Commit: Kirk McKusick <mckusick@FreeBSD.org> CommitDate: 2021-09-28 03:13:38 +0000 Eliminate snaplk / bufwait LOR when creating UFS snapshots (cherry picked from commit d7770a5495b19a987dddc77cabcdeadf18413b4d) --- sys/ufs/ffs/ffs_snapshot.c | 42 +++++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 21 deletions(-) diff --git a/sys/ufs/ffs/ffs_snapshot.c b/sys/ufs/ffs/ffs_snapshot.c index 6da84fb46bb0..baad50cab2ba 100644 --- a/sys/ufs/ffs/ffs_snapshot.c +++ b/sys/ufs/ffs/ffs_snapshot.c @@ -650,6 +650,27 @@ loop: BLK_NOCOPY, 0); vput(xvp); } + /* + * Preallocate all the direct blocks in the snapshot inode so + * that we never have to write the inode itself to commit an + * update to the contents of the snapshot. Note that once + * created, the size of the snapshot will never change, so + * there will never be a need to write the inode except to + * update the non-integrity-critical time fields and + * allocated-block count. + */ + for (blockno = 0; blockno < UFS_NDADDR; blockno++) { + if (DIP(ip, i_db[blockno]) != 0) + continue; + error = UFS_BALLOC(vp, lblktosize(fs, blockno), + fs->fs_bsize, KERNCRED, BA_CLRBUF, &bp); + if (error) + goto resumefs; + error = readblock(vp, bp, blockno); + bawrite(bp); + if (error != 0) + goto resumefs; + } /* * Acquire a lock on the snapdata structure, creating it if necessary. */ @@ -691,27 +712,6 @@ loop: sn->sn_listsize = blkp - snapblklist; VI_UNLOCK(devvp); } - /* - * Preallocate all the direct blocks in the snapshot inode so - * that we never have to write the inode itself to commit an - * update to the contents of the snapshot. Note that once - * created, the size of the snapshot will never change, so - * there will never be a need to write the inode except to - * update the non-integrity-critical time fields and - * allocated-block count. - */ - for (blockno = 0; blockno < UFS_NDADDR; blockno++) { - if (DIP(ip, i_db[blockno]) != 0) - continue; - error = UFS_BALLOC(vp, lblktosize(fs, blockno), - fs->fs_bsize, KERNCRED, BA_CLRBUF, &bp); - if (error) - goto resumefs; - error = readblock(vp, bp, blockno); - bawrite(bp); - if (error != 0) - goto resumefs; - } /* * Record snapshot inode. Since this is the newest snapshot, * it must be placed at the end of the list.
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