nfsd: don't fail unchecked creates of non-special files
[zen-stable.git] / include / linux / crash_dump.h
blobb936763f2236be16254d23380e49d99f08f82dc4
1 #ifndef LINUX_CRASH_DUMP_H
2 #define LINUX_CRASH_DUMP_H
4 #ifdef CONFIG_CRASH_DUMP
5 #include <linux/kexec.h>
6 #include <linux/device.h>
7 #include <linux/proc_fs.h>
8 #include <linux/elf.h>
10 #define ELFCORE_ADDR_MAX (-1ULL)
11 #define ELFCORE_ADDR_ERR (-2ULL)
13 extern unsigned long long elfcorehdr_addr;
14 extern unsigned long long elfcorehdr_size;
16 extern ssize_t copy_oldmem_page(unsigned long, char *, size_t,
17 unsigned long, int);
19 /* Architecture code defines this if there are other possible ELF
20 * machine types, e.g. on bi-arch capable hardware. */
21 #ifndef vmcore_elf_check_arch_cross
22 #define vmcore_elf_check_arch_cross(x) 0
23 #endif
26 * Architecture code can redefine this if there are any special checks
27 * needed for 64-bit ELF vmcores. In case of 32-bit only architecture,
28 * this can be set to zero.
30 #ifndef vmcore_elf64_check_arch
31 #define vmcore_elf64_check_arch(x) (elf_check_arch(x) || vmcore_elf_check_arch_cross(x))
32 #endif
35 * is_kdump_kernel() checks whether this kernel is booting after a panic of
36 * previous kernel or not. This is determined by checking if previous kernel
37 * has passed the elf core header address on command line.
39 * This is not just a test if CONFIG_CRASH_DUMP is enabled or not. It will
40 * return 1 if CONFIG_CRASH_DUMP=y and if kernel is booting after a panic of
41 * previous kernel.
44 static inline int is_kdump_kernel(void)
46 return (elfcorehdr_addr != ELFCORE_ADDR_MAX) ? 1 : 0;
49 /* is_vmcore_usable() checks if the kernel is booting after a panic and
50 * the vmcore region is usable.
52 * This makes use of the fact that due to alignment -2ULL is not
53 * a valid pointer, much in the vain of IS_ERR(), except
54 * dealing directly with an unsigned long long rather than a pointer.
57 static inline int is_vmcore_usable(void)
59 return is_kdump_kernel() && elfcorehdr_addr != ELFCORE_ADDR_ERR ? 1 : 0;
62 /* vmcore_unusable() marks the vmcore as unusable,
63 * without disturbing the logic of is_kdump_kernel()
66 static inline void vmcore_unusable(void)
68 if (is_kdump_kernel())
69 elfcorehdr_addr = ELFCORE_ADDR_ERR;
72 #define HAVE_OLDMEM_PFN_IS_RAM 1
73 extern int register_oldmem_pfn_is_ram(int (*fn)(unsigned long pfn));
74 extern void unregister_oldmem_pfn_is_ram(void);
76 #else /* !CONFIG_CRASH_DUMP */
77 static inline int is_kdump_kernel(void) { return 0; }
78 #endif /* CONFIG_CRASH_DUMP */
80 extern unsigned long saved_max_pfn;
81 #endif /* LINUX_CRASHDUMP_H */