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TOMOYO Linux Cross Reference
Linux/fs/ntfs/malloc.h

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  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 

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