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zfs list: Allow more fields in ZFS_ITER_SIMPLE mode

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If the fields to be listed and sorted by are constrained
to those populated by dsl_dataset_fast_stat(), then
zfs list is much faster, as it does not need to open each
objset and reads its properties.

A previous optimization by Pawel Dawidek
(0cee24064a) took advantage
of this to make listing snapshot names sorted only by name
much faster.

However, it was limited to `-o name -s name`, this work
extends this optimization to work with:
  - name
  - guid
  - createtxg
  - numclones
  - inconsistent
  - redacted
  - origin
and could be further extended to any other properties
supported by dsl_dataset_fast_stat() or similar, that do
not require extra locking or reading from disk.

Reviewed-by: Mark Maybee <mark.maybee@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Pawel Jakub Dawidek <pawel@dawidek.net>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Closes #11080
This commit is contained in:
Allan Jude
2021-12-16 14:56:22 -05:00
committed by GitHub
parent 2300621dc7
commit f6a0dac84a
14 changed files with 189 additions and 95 deletions
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lib/libzfs/libzfs_mount.c
+2 -2
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@@ -1128,7 +1128,7 @@ zfs_iter_cb(zfs_handle_t *zhp, void *data)
}
libzfs_add_handle(cbp, zhp);
if (zfs_iter_filesystems(zhp, zfs_iter_cb, cbp) != 0) {
if (zfs_iter_filesystems(zhp, 0, zfs_iter_cb, cbp) != 0) {
zfs_close(zhp);
return (-1);
}
@@ -1475,7 +1475,7 @@ zpool_enable_datasets(zpool_handle_t *zhp, const char *mntopts, int flags)
* over all child filesystems.
*/
libzfs_add_handle(&cb, zfsp);
if (zfs_iter_filesystems(zfsp, zfs_iter_cb, &cb) != 0)
if (zfs_iter_filesystems(zfsp, 0, zfs_iter_cb, &cb) != 0)
goto out;
/*