1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * malloc.h - NTFS kernel memory handling. Part of the Linux-NTFS project. 4 * 5 * Copyright (c) 2001-2005 Anton Altaparmakov 6 */ 7 8 #ifndef _LINUX_NTFS_MALLOC_H 9 #define _LINUX_NTFS_MALLOC_H 10 11 #include <linux/vmalloc.h> 12 #include <linux/slab.h> 13 #include <linux/highmem.h> 14 15 /** 16 * __ntfs_malloc - allocate memory in multiples of pages 17 * @size: number of bytes to allocate 18 * @gfp_mask: extra flags for the allocator 19 * 20 * Internal function. You probably want ntfs_malloc_nofs()... 21 * 22 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and 23 * returns a pointer to the allocated memory. 24 * 25 * If there was insufficient memory to complete the request, return NULL. 26 * Depending on @gfp_mask the allocation may be guaranteed to succeed. 27 */ 28 static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask) 29 { 30 if (likely(size <= PAGE_SIZE)) { 31 BUG_ON(!size); 32 /* kmalloc() has per-CPU caches so is faster for now. */ 33 return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM); 34 /* return (void *)__get_free_page(gfp_mask); */ 35 } 36 if (likely((size >> PAGE_SHIFT) < totalram_pages())) 37 return __vmalloc(size, gfp_mask); 38 return NULL; 39 } 40 41 /** 42 * ntfs_malloc_nofs - allocate memory in multiples of pages 43 * @size: number of bytes to allocate 44 * 45 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and 46 * returns a pointer to the allocated memory. 47 * 48 * If there was insufficient memory to complete the request, return NULL. 49 */ 50 static inline void *ntfs_malloc_nofs(unsigned long size) 51 { 52 return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM); 53 } 54 55 /** 56 * ntfs_malloc_nofs_nofail - allocate memory in multiples of pages 57 * @size: number of bytes to allocate 58 * 59 * Allocates @size bytes of memory, rounded up to multiples of PAGE_SIZE and 60 * returns a pointer to the allocated memory. 61 * 62 * This function guarantees that the allocation will succeed. It will sleep 63 * for as long as it takes to complete the allocation. 64 * 65 * If there was insufficient memory to complete the request, return NULL. 66 */ 67 static inline void *ntfs_malloc_nofs_nofail(unsigned long size) 68 { 69 return __ntfs_malloc(size, GFP_NOFS | __GFP_HIGHMEM | __GFP_NOFAIL); 70 } 71 72 static inline void ntfs_free(void *addr) 73 { 74 kvfree(addr); 75 } 76 77 #endif /* _LINUX_NTFS_MALLOC_H */ 78