On Fri, Mar 07, 2025 at 09:55:01AM -0800, Darrick J. Wong wrote: > From: Darrick J. Wong <djwong@xxxxxxxxxx> > > Augment the messaging in xfs_admin and xfs_repair to advise the user to > replay a dirty log on a snapshotted filesystem by mounting with nouuid > if the origin filesystem is still mounted. A user accidentally zapped > the log when trying to mount a backup snapshot because the instructions > we gave them weren't sufficient. > > Reported-by: Kjetil Torgrim Homme <kjetilho@xxxxxxxxxx> > Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx> Reviewed-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx> > --- > db/sb.c | 9 +++++---- > man/man5/xfs.5 | 5 +++++ > repair/phase2.c | 9 +++++---- > 3 files changed, 15 insertions(+), 8 deletions(-) > > diff --git a/db/sb.c b/db/sb.c > index aa8fce6712e571..52ac48d45d5ae6 100644 > --- a/db/sb.c > +++ b/db/sb.c > @@ -266,10 +266,11 @@ sb_logcheck(void) > dbprintf(_( > "ERROR: The filesystem has valuable metadata changes in a log which needs to\n" > "be replayed. Mount the filesystem to replay the log, and unmount it before\n" > -"re-running %s. If you are unable to mount the filesystem, then use\n" > -"the xfs_repair -L option to destroy the log and attempt a repair.\n" > -"Note that destroying the log may cause corruption -- please attempt a mount\n" > -"of the filesystem before doing this.\n"), progname); > +"re-running %s. If the filesystem is a snapshot of a mounted filesystem,\n" > +"you may need to give mount the nouuid option. If you are unable to mount\n" > +"the filesystem, then use the xfs_repair -L option to destroy the log and\n" > +"attempt a repair. Note that destroying the log may cause corruption --\n" > +"please attempt a mount of the filesystem before doing this.\n"), progname); > return 0; > } > /* Log is clean */ > diff --git a/man/man5/xfs.5 b/man/man5/xfs.5 > index 0c1edc53e227ce..f9c046d4721a14 100644 > --- a/man/man5/xfs.5 > +++ b/man/man5/xfs.5 > @@ -91,6 +91,11 @@ .SH DESCRIPTION > and > .BR xfsrestore (8) > are recommended for making copies of XFS filesystems. > +To mount a snapshot of an already-mounted filesystem, you may need to supply > +the > +.B nouuid > +option to > +.BR mount " (8)." > .SH OPERATIONS > Some functionality specific to the XFS filesystem is accessible to > applications through the > diff --git a/repair/phase2.c b/repair/phase2.c > index 29a406f69ca3a1..9a9733749266e5 100644 > --- a/repair/phase2.c > +++ b/repair/phase2.c > @@ -72,10 +72,11 @@ zero_log( > do_warn(_( > "ERROR: The filesystem has valuable metadata changes in a log which needs to\n" > "be replayed. Mount the filesystem to replay the log, and unmount it before\n" > -"re-running xfs_repair. If you are unable to mount the filesystem, then use\n" > -"the -L option to destroy the log and attempt a repair.\n" > -"Note that destroying the log may cause corruption -- please attempt a mount\n" > -"of the filesystem before doing this.\n")); > +"re-running xfs_repair. If the filesystem is a snapshot of a mounted\n" > +"filesystem, you may need to give mount the nouuid option.If you are unable\n" > +"to mount the filesystem, then use the -L option to destroy the log and\n" > +"attempt a repair. Note that destroying the log may cause corruption --\n" > +"please attempt a mount of the filesystem before doing this.\n")); > exit(2); > } > }
