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FreeBSD: add support for lockless symlink lookup

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Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Mateusz Guzik <mjguzik@gmail.com>
Closes #11883
This commit is contained in:
Mateusz Guzik
2021-04-12 19:59:22 +02:00
committed by Brian Behlendorf
parent ffc2e74f79
commit 4568b5cfba
3 changed files with 100 additions and 2 deletions
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module/os/freebsd/zfs/zfs_znode.c
+15
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@@ -444,6 +444,9 @@ zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz,
zp->z_blksz = blksz;
zp->z_seq = 0x7A4653;
zp->z_sync_cnt = 0;
#if __FreeBSD_version >= 1300139
atomic_store_ptr(&zp->z_cached_symlink, NULL);
#endif
vp = ZTOV(zp);
@@ -1237,6 +1240,9 @@ void
zfs_znode_free(znode_t *zp)
{
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
#if __FreeBSD_version >= 1300139
char *symlink;
#endif
ASSERT(zp->z_sa_hdl == NULL);
zp->z_vnode = NULL;
@@ -1246,6 +1252,15 @@ zfs_znode_free(znode_t *zp)
zfsvfs->z_nr_znodes--;
mutex_exit(&zfsvfs->z_znodes_lock);
#if __FreeBSD_version >= 1300139
symlink = atomic_load_ptr(&zp->z_cached_symlink);
if (symlink != NULL) {
atomic_store_rel_ptr((uintptr_t *)&zp->z_cached_symlink,
(uintptr_t)NULL);
cache_symlink_free(symlink, strlen(symlink) + 1);
}
#endif
if (zp->z_acl_cached) {
zfs_acl_free(zp->z_acl_cached);
zp->z_acl_cached = NULL;