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Additional dkio support for TRIM/Discard 

Replace DKIOCTRIM with DKIOCFREE and add additional support required
for Nextenta's TRIM support.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #469
This commit is contained in:
Tim Chase 2015-07-24 15:36:59 -05:00 committed by Brian Behlendorf
parent 9f456111ab
commit e5f9a9afd2
3 changed files with 65 additions and 8 deletions
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1
include/sys/Makefile.am
View File

@ -29,6 +29,7 @@ KERNEL_H = \
$(top_srcdir)/include/sys/dirent.h \
$(top_srcdir)/include/sys/disp.h \
$(top_srcdir)/include/sys/dkio.h \
$(top_srcdir)/include/sys/dkioc_free_util.h \
$(top_srcdir)/include/sys/dklabel.h \
$(top_srcdir)/include/sys/dnlc.h \
$(top_srcdir)/include/sys/dumphdr.h \

16
include/sys/dkio.h
View File

@ -25,14 +25,16 @@
#ifndef _SPL_DKIO_H
#define _SPL_DKIO_H
struct dk_callback {
void (*dkc_callback)(void *dkc_cookie, int error);
void *dkc_cookie;
int dkc_flag;
};
#define DFL_SZ(num_exts) \
(sizeof (dkioc_free_list_t) + (num_exts - 1) * 16)
#define DKIOC (0x04 << 8)
#define DKIOCFLUSHWRITECACHE (DKIOC | 34)
#define DKIOCTRIM (DKIOC | 35)
#define DKIOCFLUSHWRITECACHE (DKIOC|34) /* flush cache to phys medium */
/*
* ioctl to free space (e.g. SCSI UNMAP) off a disk.
* Pass a dkioc_free_list_t containing a list of extents to be freed.
*/
#define DKIOCFREE (DKIOC|50)
#endif /* _SPL_DKIO_H */

54
include/sys/dkioc_free_util.h Normal file
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@ -0,0 +1,54 @@
/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://zfsonlinux.org/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/
#ifndef _SPL_DKIOC_UTIL_H
#define _SPL_DKIOC_UTIL_H
#include <sys/dkio.h>
typedef struct dkioc_free_list_ext_s {
uint64_t dfle_start;
uint64_t dfle_length;
} dkioc_free_list_ext_t;
typedef struct dkioc_free_list_s {
uint64_t dfl_flags;
uint64_t dfl_num_exts;
int64_t dfl_offset;
/*
* N.B. this is only an internal debugging API! This is only called
* from debug builds of sd for pre-release checking. Remove before GA!
*/
void (*dfl_ck_func)(uint64_t, uint64_t, void *);
void *dfl_ck_arg;
dkioc_free_list_ext_t dfl_exts[1];
} dkioc_free_list_t;
static inline void dfl_free(dkioc_free_list_t *dfl) {
kmem_free(dfl, DFL_SZ(dfl->dfl_num_exts));
}
#endif /* _SPL_DKIOC_UTIL_H */