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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include <linux/backing-dev.h>
8#include "xfs_message.h"
9#include "xfs_trace.h"
10
11void *
12kmem_alloc(size_t size, xfs_km_flags_t flags)
13{
14 int retries = 0;
15 gfp_t lflags = kmem_flags_convert(flags);
16 void *ptr;
17
18 trace_kmem_alloc(size, flags, _RET_IP_);
19
20 do {
21 ptr = kmalloc(size, lflags);
22 if (ptr || (flags & KM_MAYFAIL))
23 return ptr;
24 if (!(++retries % 100))
25 xfs_err(NULL,
26 "%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)",
27 current->comm, current->pid,
28 (unsigned int)size, __func__, lflags);
29 congestion_wait(BLK_RW_ASYNC, HZ/50);
30 } while (1);
31}
32
33
34/*
35 * __vmalloc() will allocate data pages and auxiliary structures (e.g.
36 * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context here. Hence
37 * we need to tell memory reclaim that we are in such a context via
38 * PF_MEMALLOC_NOFS to prevent memory reclaim re-entering the filesystem here
39 * and potentially deadlocking.
40 */
41static void *
42__kmem_vmalloc(size_t size, xfs_km_flags_t flags)
43{
44 unsigned nofs_flag = 0;
45 void *ptr;
46 gfp_t lflags = kmem_flags_convert(flags);
47
48 if (flags & KM_NOFS)
49 nofs_flag = memalloc_nofs_save();
50
51 ptr = __vmalloc(size, lflags);
52
53 if (flags & KM_NOFS)
54 memalloc_nofs_restore(nofs_flag);
55
56 return ptr;
57}
58
59/*
60 * Same as kmem_alloc_large, except we guarantee the buffer returned is aligned
61 * to the @align_mask. We only guarantee alignment up to page size, we'll clamp
62 * alignment at page size if it is larger. vmalloc always returns a PAGE_SIZE
63 * aligned region.
64 */
65void *
66kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags)
67{
68 void *ptr;
69
70 trace_kmem_alloc_io(size, flags, _RET_IP_);
71
72 if (WARN_ON_ONCE(align_mask >= PAGE_SIZE))
73 align_mask = PAGE_SIZE - 1;
74
75 ptr = kmem_alloc(size, flags | KM_MAYFAIL);
76 if (ptr) {
77 if (!((uintptr_t)ptr & align_mask))
78 return ptr;
79 kfree(ptr);
80 }
81 return __kmem_vmalloc(size, flags);
82}
83
84void *
85kmem_alloc_large(size_t size, xfs_km_flags_t flags)
86{
87 void *ptr;
88
89 trace_kmem_alloc_large(size, flags, _RET_IP_);
90
91 ptr = kmem_alloc(size, flags | KM_MAYFAIL);
92 if (ptr)
93 return ptr;
94 return __kmem_vmalloc(size, flags);
95}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include <linux/backing-dev.h>
8#include "xfs_message.h"
9#include "xfs_trace.h"
10
11void *
12kmem_alloc(size_t size, xfs_km_flags_t flags)
13{
14 int retries = 0;
15 gfp_t lflags = kmem_flags_convert(flags);
16 void *ptr;
17
18 trace_kmem_alloc(size, flags, _RET_IP_);
19
20 do {
21 ptr = kmalloc(size, lflags);
22 if (ptr || (flags & KM_MAYFAIL))
23 return ptr;
24 if (!(++retries % 100))
25 xfs_err(NULL,
26 "%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)",
27 current->comm, current->pid,
28 (unsigned int)size, __func__, lflags);
29 congestion_wait(BLK_RW_ASYNC, HZ/50);
30 } while (1);
31}
32
33
34/*
35 * __vmalloc() will allocate data pages and auxiliary structures (e.g.
36 * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context here. Hence
37 * we need to tell memory reclaim that we are in such a context via
38 * PF_MEMALLOC_NOFS to prevent memory reclaim re-entering the filesystem here
39 * and potentially deadlocking.
40 */
41static void *
42__kmem_vmalloc(size_t size, xfs_km_flags_t flags)
43{
44 unsigned nofs_flag = 0;
45 void *ptr;
46 gfp_t lflags = kmem_flags_convert(flags);
47
48 if (flags & KM_NOFS)
49 nofs_flag = memalloc_nofs_save();
50
51 ptr = __vmalloc(size, lflags);
52
53 if (flags & KM_NOFS)
54 memalloc_nofs_restore(nofs_flag);
55
56 return ptr;
57}
58
59/*
60 * Same as kmem_alloc_large, except we guarantee the buffer returned is aligned
61 * to the @align_mask. We only guarantee alignment up to page size, we'll clamp
62 * alignment at page size if it is larger. vmalloc always returns a PAGE_SIZE
63 * aligned region.
64 */
65void *
66kmem_alloc_io(size_t size, int align_mask, xfs_km_flags_t flags)
67{
68 void *ptr;
69
70 trace_kmem_alloc_io(size, flags, _RET_IP_);
71
72 if (WARN_ON_ONCE(align_mask >= PAGE_SIZE))
73 align_mask = PAGE_SIZE - 1;
74
75 ptr = kmem_alloc(size, flags | KM_MAYFAIL);
76 if (ptr) {
77 if (!((uintptr_t)ptr & align_mask))
78 return ptr;
79 kfree(ptr);
80 }
81 return __kmem_vmalloc(size, flags);
82}
83
84void *
85kmem_alloc_large(size_t size, xfs_km_flags_t flags)
86{
87 void *ptr;
88
89 trace_kmem_alloc_large(size, flags, _RET_IP_);
90
91 ptr = kmem_alloc(size, flags | KM_MAYFAIL);
92 if (ptr)
93 return ptr;
94 return __kmem_vmalloc(size, flags);
95}
96
97void *
98kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags)
99{
100 int retries = 0;
101 gfp_t lflags = kmem_flags_convert(flags);
102 void *ptr;
103
104 trace_kmem_realloc(newsize, flags, _RET_IP_);
105
106 do {
107 ptr = krealloc(old, newsize, lflags);
108 if (ptr || (flags & KM_MAYFAIL))
109 return ptr;
110 if (!(++retries % 100))
111 xfs_err(NULL,
112 "%s(%u) possible memory allocation deadlock size %zu in %s (mode:0x%x)",
113 current->comm, current->pid,
114 newsize, __func__, lflags);
115 congestion_wait(BLK_RW_ASYNC, HZ/50);
116 } while (1);
117}