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1b17d76646
It's possible to recurse into filesystem from the memory allocation, which deadlocks in xfs_qm_shake(). Add check for __GFP_FS, and bail out if it is not set. Signed-off-by: Felix Blyakher <felixb@sgi.com> Signed-off-by: Hedi Berriche <hedi@sgi.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Felix Blyakher <felixb@sgi.com>
110 lines
2.9 KiB
C
110 lines
2.9 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_SUPPORT_KMEM_H__
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#define __XFS_SUPPORT_KMEM_H__
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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/*
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* General memory allocation interfaces
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*/
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#define KM_SLEEP 0x0001u
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#define KM_NOSLEEP 0x0002u
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#define KM_NOFS 0x0004u
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#define KM_MAYFAIL 0x0008u
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#define KM_LARGE 0x0010u
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/*
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* We use a special process flag to avoid recursive callbacks into
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* the filesystem during transactions. We will also issue our own
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* warnings, so we explicitly skip any generic ones (silly of us).
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*/
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static inline gfp_t
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kmem_flags_convert(unsigned int __nocast flags)
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{
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gfp_t lflags;
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BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_LARGE));
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if (flags & KM_NOSLEEP) {
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lflags = GFP_ATOMIC | __GFP_NOWARN;
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} else {
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lflags = GFP_KERNEL | __GFP_NOWARN;
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if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
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lflags &= ~__GFP_FS;
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}
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return lflags;
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}
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extern void *kmem_alloc(size_t, unsigned int __nocast);
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extern void *kmem_zalloc(size_t, unsigned int __nocast);
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extern void *kmem_zalloc_greedy(size_t *, size_t, size_t, unsigned int __nocast);
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extern void *kmem_realloc(const void *, size_t, size_t, unsigned int __nocast);
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extern void kmem_free(const void *);
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/*
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* Zone interfaces
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*/
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#define KM_ZONE_HWALIGN SLAB_HWCACHE_ALIGN
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#define KM_ZONE_RECLAIM SLAB_RECLAIM_ACCOUNT
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#define KM_ZONE_SPREAD SLAB_MEM_SPREAD
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#define kmem_zone kmem_cache
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#define kmem_zone_t struct kmem_cache
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static inline kmem_zone_t *
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kmem_zone_init(int size, char *zone_name)
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{
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return kmem_cache_create(zone_name, size, 0, 0, NULL);
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}
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static inline kmem_zone_t *
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kmem_zone_init_flags(int size, char *zone_name, unsigned long flags,
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void (*construct)(void *))
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{
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return kmem_cache_create(zone_name, size, 0, flags, construct);
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}
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static inline void
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kmem_zone_free(kmem_zone_t *zone, void *ptr)
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{
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kmem_cache_free(zone, ptr);
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}
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static inline void
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kmem_zone_destroy(kmem_zone_t *zone)
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{
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if (zone)
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kmem_cache_destroy(zone);
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}
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extern void *kmem_zone_alloc(kmem_zone_t *, unsigned int __nocast);
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extern void *kmem_zone_zalloc(kmem_zone_t *, unsigned int __nocast);
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static inline int
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kmem_shake_allow(gfp_t gfp_mask)
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{
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return ((gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS));
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}
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#endif /* __XFS_SUPPORT_KMEM_H__ */
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