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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2017-10-17 21:37:36 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-10-26 15:38:23 -0700 |
| commit | dcb660f9222fd9f607e7e05f4755b39b809ca19f (patch) | |
| tree | 7f18fd46d04dae3fb1aa27192e2e7e1d4ab0110c /fs/xfs/scrub/scrub.c | |
| parent | a56371865e7870d953d3837aaa1d12230bba021d (diff) | |
| download | linux-dcb660f9222fd9f607e7e05f4755b39b809ca19f.tar.gz linux-dcb660f9222fd9f607e7e05f4755b39b809ca19f.tar.bz2 linux-dcb660f9222fd9f607e7e05f4755b39b809ca19f.zip | |
xfs: probe the scrub ioctl
Create a probe scrubber with id 0. This will be used by xfs_scrub to
probe the kernel's abilities to scrub (and repair) the metadata. We do
this by validating the ioctl inputs from userspace, preparing the
filesystem for a scrub (or a repair) operation, and immediately
returning to userspace. Userspace can use the returned errno and
structure state to decide (in broad terms) if scrub/repair are
supported by the running kernel.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Diffstat (limited to 'fs/xfs/scrub/scrub.c')
| -rw-r--r-- | fs/xfs/scrub/scrub.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/xfs/scrub/scrub.c b/fs/xfs/scrub/scrub.c index 1fc8d3b43902..71183a8678aa 100644 --- a/fs/xfs/scrub/scrub.c +++ b/fs/xfs/scrub/scrub.c @@ -42,6 +42,7 @@ #include "xfs_rmap_btree.h" #include "scrub/xfs_scrub.h" #include "scrub/scrub.h" +#include "scrub/common.h" #include "scrub/trace.h" /* @@ -108,6 +109,30 @@ * will be set. */ +/* + * Scrub probe -- userspace uses this to probe if we're willing to scrub + * or repair a given mountpoint. This will be used by xfs_scrub to + * probe the kernel's abilities to scrub (and repair) the metadata. We + * do this by validating the ioctl inputs from userspace, preparing the + * filesystem for a scrub (or a repair) operation, and immediately + * returning to userspace. Userspace can use the returned errno and + * structure state to decide (in broad terms) if scrub/repair are + * supported by the running kernel. + */ +int +xfs_scrub_probe( + struct xfs_scrub_context *sc) +{ + int error = 0; + + if (sc->sm->sm_ino || sc->sm->sm_agno) + return -EINVAL; + if (xfs_scrub_should_terminate(sc, &error)) + return error; + + return 0; +} + /* Scrub setup and teardown */ /* Free all the resources and finish the transactions. */ @@ -126,6 +151,10 @@ xfs_scrub_teardown( /* Scrubbing dispatch. */ static const struct xfs_scrub_meta_ops meta_scrub_ops[] = { + { /* ioctl presence test */ + .setup = xfs_scrub_setup_fs, + .scrub = xfs_scrub_probe, + }, }; /* This isn't a stable feature, warn once per day. */ |