/* * Copyright (c) 2000-2005 Silicon Graphics, Inc. * All Rights Reserved. * * This program 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. * * This program is distributed in the hope that it would 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 this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <linux/mm.h> #include <linux/highmem.h> #include <linux/slab.h> #include <linux/swap.h> #include <linux/blkdev.h> #include <linux/backing-dev.h> #include "kmem.h" #include "xfs_message.h" /* * Greedy allocation. May fail and may return vmalloced memory. */ void * kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize) { void *ptr; size_t kmsize = maxsize; while (!(ptr = vzalloc(kmsize))) { if ((kmsize >>= 1) <= minsize) kmsize = minsize; } if (ptr) *size = kmsize; return ptr; } void * kmem_alloc(size_t size, xfs_km_flags_t flags) { int retries = 0; gfp_t lflags = kmem_flags_convert(flags); void *ptr; do { ptr = kmalloc(size, lflags); if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) return ptr; if (!(++retries % 100)) xfs_err(NULL, "possible memory allocation deadlock in %s (mode:0x%x)", __func__, lflags); congestion_wait(BLK_RW_ASYNC, HZ/50); } while (1); } void * kmem_zalloc_large(size_t size, xfs_km_flags_t flags) { unsigned noio_flag = 0; void *ptr; gfp_t lflags; ptr = kmem_zalloc(size, flags | KM_MAYFAIL); if (ptr) return ptr; /* * __vmalloc() will allocate data pages and auxillary structures (e.g. * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context * here. Hence we need to tell memory reclaim that we are in such a * context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering * the filesystem here and potentially deadlocking. */ if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) noio_flag = memalloc_noio_save(); lflags = kmem_flags_convert(flags); ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL); if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS)) memalloc_noio_restore(noio_flag); return ptr; } void kmem_free(const void *ptr) { if (!is_vmalloc_addr(ptr)) { kfree(ptr); } else { vfree(ptr); } } void * kmem_realloc(const void *ptr, size_t newsize, size_t oldsize, xfs_km_flags_t flags) { void *new; new = kmem_alloc(newsize, flags); if (ptr) { if (new) memcpy(new, ptr, ((oldsize < newsize) ? oldsize : newsize)); kmem_free(ptr); } return new; } void * kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags) { int retries = 0; gfp_t lflags = kmem_flags_convert(flags); void *ptr; do { ptr = kmem_cache_alloc(zone, lflags); if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP))) return ptr; if (!(++retries % 100)) xfs_err(NULL, "possible memory allocation deadlock in %s (mode:0x%x)", __func__, lflags); congestion_wait(BLK_RW_ASYNC, HZ/50); } while (1); }