diff options
| author | Andrew <[email protected]> | 2022-06-17 13:44:49 -0500 |
|---|---|---|
| committer | GitHub <[email protected]> | 2022-06-17 11:44:49 -0700 |
| commit | f60973998593c37f55beea05e74528c1992b7849 (patch) | |
| tree | 86ac557cf6f6bec9006cf72f296eb2190d93ab36 /module/os/linux/zfs | |
| parent | 10891b37fa8f2cbf71ec529fc3808113d94d52ef (diff) | |
expose snapshot count via stat(2) of .zfs/snapshot (#13559)
Increase nlinks in stat results of ./zfs/snapshot based on snapshot
count. This provides quick and efficient method for administrators to
get snapshot counts without having to use libzfs or list the snapdir
contents.
Reviewed-by: Ryan Moeller <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Andrew Walker <[email protected]>
Closes #13559
Diffstat (limited to 'module/os/linux/zfs')
| -rw-r--r-- | module/os/linux/zfs/zpl_ctldir.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/module/os/linux/zfs/zpl_ctldir.c b/module/os/linux/zfs/zpl_ctldir.c index f4e1ab7ae..d5c222120 100644 --- a/module/os/linux/zfs/zpl_ctldir.c +++ b/module/os/linux/zfs/zpl_ctldir.c @@ -32,6 +32,9 @@ #include <sys/zfs_vnops.h> #include <sys/zfs_ctldir.h> #include <sys/zpl.h> +#include <sys/dmu.h> +#include <sys/dsl_dataset.h> +#include <sys/zap.h> /* * Common open routine. Disallow any write access. @@ -411,6 +414,20 @@ zpl_snapdir_getattr_impl(const struct path *path, struct kstat *stat, #endif stat->nlink = stat->size = 2; + + dsl_dataset_t *ds = dmu_objset_ds(zfsvfs->z_os); + if (dsl_dataset_phys(ds)->ds_snapnames_zapobj != 0) { + uint64_t snap_count; + int err = zap_count( + dmu_objset_pool(ds->ds_objset)->dp_meta_objset, + dsl_dataset_phys(ds)->ds_snapnames_zapobj, &snap_count); + if (err != 0) { + ZPL_EXIT(zfsvfs); + return (-err); + } + stat->nlink += snap_count; + } + stat->ctime = stat->mtime = dmu_objset_snap_cmtime(zfsvfs->z_os); stat->atime = current_time(ip); ZPL_EXIT(zfsvfs); |