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e1310afae3
The get_vmalloc_info() function was used to back the vmem_size() function. This was always problematic and resulted in brittle code because the kernel never provided a clean interface for modules. However, it turns out that the only caller of this function in ZFS uses it to determine the total virtual address space size. This can be determined easily without get_vmalloc_info() so vmem_size() has been updated to take this approach which allows us to shed the get_vmalloc_info() dependency. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://zfsonlinux.org/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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#ifndef _SPL_VMSYSTM_H
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#define _SPL_VMSYSTM_H
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#include <linux/mmzone.h>
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#include <linux/mm.h>
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#include <linux/swap.h>
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#include <linux/highmem.h>
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#include <linux/vmalloc.h>
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#include <sys/types.h>
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#include <asm/uaccess.h>
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/* These values are loosely coupled with the VM page reclaim.
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* Linux uses its own heuristics to trigger page reclamation, and
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* because those interface are difficult to interface with. These
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* values should only be considered as a rough guide to the system
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* memory state and not as direct evidence that page reclamation.
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* is or is not currently in progress.
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*/
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#define membar_producer() smp_wmb()
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#define physmem totalram_pages
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#define freemem nr_free_pages()
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#define availrmem spl_kmem_availrmem()
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extern pgcnt_t minfree; /* Sum of zone->pages_min */
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extern pgcnt_t desfree; /* Sum of zone->pages_low */
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extern pgcnt_t lotsfree; /* Sum of zone->pages_high */
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extern pgcnt_t needfree; /* Always 0 unused in new Solaris */
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extern pgcnt_t swapfs_minfree; /* Solaris default value */
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extern pgcnt_t swapfs_reserve; /* Solaris default value */
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extern vmem_t *heap_arena; /* primary kernel heap arena */
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extern vmem_t *zio_alloc_arena; /* arena for zio caches */
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extern vmem_t *zio_arena; /* arena for allocating zio memory */
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extern pgcnt_t spl_kmem_availrmem(void);
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extern size_t vmem_size(vmem_t *vmp, int typemask);
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#define VMEM_ALLOC 0x01
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#define VMEM_FREE 0x02
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#ifndef VMALLOC_TOTAL
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#define VMALLOC_TOTAL (VMALLOC_END - VMALLOC_START)
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#endif
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#ifdef HAVE_PGDAT_HELPERS
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/* Source linux/mm/mmzone.c */
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# ifndef HAVE_FIRST_ONLINE_PGDAT
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typedef struct pglist_data *(*first_online_pgdat_t)(void);
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extern first_online_pgdat_t first_online_pgdat_fn;
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# define first_online_pgdat() first_online_pgdat_fn()
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# endif /* HAVE_FIRST_ONLINE_PGDAT */
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# ifndef HAVE_NEXT_ONLINE_PGDAT
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typedef struct pglist_data *(*next_online_pgdat_t)(struct pglist_data *);
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extern next_online_pgdat_t next_online_pgdat_fn;
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# define next_online_pgdat(pgd) next_online_pgdat_fn(pgd)
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# endif /* HAVE_NEXT_ONLINE_PGDAT */
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# ifndef HAVE_NEXT_ZONE
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typedef struct zone *(*next_zone_t)(struct zone *);
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extern next_zone_t next_zone_fn;
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# define next_zone(zone) next_zone_fn(zone)
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# endif /* HAVE_NEXT_ZONE */
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#else /* HAVE_PGDAT_HELPERS */
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# ifndef HAVE_PGDAT_LIST
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extern struct pglist_data *pgdat_list_addr;
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# define pgdat_list pgdat_list_addr
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# endif /* HAVE_PGDAT_LIST */
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#endif /* HAVE_PGDAT_HELPERS */
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/* Source linux/mm/vmstat.c */
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#if defined(NEED_GET_ZONE_COUNTS) && !defined(HAVE_GET_ZONE_COUNTS)
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typedef void (*get_zone_counts_t)(unsigned long *, unsigned long *,
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unsigned long *);
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extern get_zone_counts_t get_zone_counts_fn;
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# define get_zone_counts(a,i,f) get_zone_counts_fn(a,i,f)
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#endif /* NEED_GET_ZONE_COUNTS && !HAVE_GET_ZONE_COUNTS */
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typedef enum spl_zone_stat_item {
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SPL_NR_FREE_PAGES,
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SPL_NR_INACTIVE,
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SPL_NR_ACTIVE,
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SPL_NR_ZONE_STAT_ITEMS
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} spl_zone_stat_item_t;
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extern unsigned long spl_global_page_state(spl_zone_stat_item_t);
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#define xcopyin(from, to, size) copy_from_user(to, from, size)
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#define xcopyout(from, to, size) copy_to_user(to, from, size)
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static __inline__ int
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copyin(const void *from, void *to, size_t len)
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{
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/* On error copyin routine returns -1 */
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if (xcopyin(from, to, len))
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return -1;
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return 0;
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}
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static __inline__ int
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copyout(const void *from, void *to, size_t len)
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{
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/* On error copyout routine returns -1 */
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if (xcopyout(from, to, len))
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return -1;
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return 0;
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}
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static __inline__ int
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copyinstr(const void *from, void *to, size_t len, size_t *done)
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{
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size_t rc;
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if (len == 0)
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return -ENAMETOOLONG;
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/* XXX: Should return ENAMETOOLONG if 'strlen(from) > len' */
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memset(to, 0, len);
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rc = copyin(from, to, len - 1);
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if (done != NULL)
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*done = rc;
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return 0;
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}
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#endif /* SPL_VMSYSTM_H */
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