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FreeBSD: Implement hole-punching support 

This adds supports for hole-punching facilities in the FreeBSD kernel
starting from __FreeBSD_version 1400032.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ka Ho Ng <khng@FreeBSD.org>
Sponsored-by: The FreeBSD Foundation
Closes #12458
This commit is contained in:
Ka Ho Ng 2021-08-04 23:57:48 +08:00 committed by Brian Behlendorf
parent 1467a1bb33
commit 1f31889046
2 changed files with 64 additions and 3 deletions
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57
module/os/freebsd/zfs/zfs_vnops_os.c
View File

@ -5237,6 +5237,11 @@ zfs_freebsd_pathconf(struct vop_pathconf_args *ap)
case _PC_NAME_MAX:
*ap->a_retval = NAME_MAX;
return (0);
#if __FreeBSD_version >= 1400032
case _PC_DEALLOC_PRESENT:
*ap->a_retval = 1;
return (0);
#endif
case _PC_PIPE_BUF:
if (ap->a_vp->v_type == VDIR || ap->a_vp->v_type == VFIFO) {
*ap->a_retval = PIPE_BUF;
@ -6076,6 +6081,55 @@ zfs_vptocnp(struct vop_vptocnp_args *ap)
return (error);
}
#if __FreeBSD_version >= 1400032
static int
zfs_deallocate(struct vop_deallocate_args *ap)
{
znode_t *zp = VTOZ(ap->a_vp);
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
zilog_t *zilog;
off_t off, len, file_sz;
int error;
ZFS_ENTER(zfsvfs);
ZFS_VERIFY_ZP(zp);
/*
* Callers might not be able to detect properly that we are read-only,
* so check it explicitly here.
*/
if (zfs_is_readonly(zfsvfs)) {
ZFS_EXIT(zfsvfs);
return (SET_ERROR(EROFS));
}
zilog = zfsvfs->z_log;
off = *ap->a_offset;
len = *ap->a_len;
file_sz = zp->z_size;
if (off + len > file_sz)
len = file_sz - off;
/* Fast path for out-of-range request. */
if (len <= 0) {
*ap->a_len = 0;
ZFS_EXIT(zfsvfs);
return (0);
}
error = zfs_freesp(zp, off, len, O_RDWR, TRUE);
if (error == 0) {
if (zfsvfs->z_os->os_sync == ZFS_SYNC_ALWAYS ||
(ap->a_ioflag & IO_SYNC) != 0)
zil_commit(zilog, zp->z_id);
*ap->a_offset = off + len;
*ap->a_len = 0;
}
ZFS_EXIT(zfsvfs);
return (error);
}
#endif
struct vop_vector zfs_vnodeops;
struct vop_vector zfs_fifoops;
struct vop_vector zfs_shareops;
@ -6095,6 +6149,9 @@ struct vop_vector zfs_vnodeops = {
#endif
.vop_access = zfs_freebsd_access,
.vop_allocate = VOP_EINVAL,
#if __FreeBSD_version >= 1400032
.vop_deallocate = zfs_deallocate,
#endif
.vop_lookup = zfs_cache_lookup,
.vop_cachedlookup = zfs_freebsd_cachedlookup,
.vop_getattr = zfs_freebsd_getattr,

10
module/os/freebsd/zfs/zfs_znode.c
View File

@ -1487,12 +1487,16 @@ zfs_free_range(znode_t *zp, uint64_t off, uint64_t len)
error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len);
if (error == 0) {
#if __FreeBSD_version >= 1400032
vnode_pager_purge_range(ZTOV(zp), off, off + len);
#else
/*
* In FreeBSD we cannot free block in the middle of a file,
* but only at the end of a file, so this code path should
* never happen.
* Before __FreeBSD_version 1400032 we cannot free block in the
* middle of a file, but only at the end of a file, so this code
* path should never happen.
*/
vnode_pager_setsize(ZTOV(zp), off);
#endif
}
zfs_rangelock_exit(lr);