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853bc0ab34
The ubd code suffers from a possible y2038 overflow on 32-bit architectures, both for the cow header and the os_file_modtime() function. Replace time_t with time64_t to extend the ubd_kern side as much as possible. Whether this makes a difference for the user side depends on the host libc implementation that may use either 32-bit or 64-bit time_t. For the cow file format, the header contains an unsigned 32-bit timestamp, which is good until y2106, passing this through a 'long long' gives us a consistent interpretation between 32-bit and 64-bit um kernels. Signed-off-by: Arnd Bergmann <arnd@arndb.de>
33 lines
1.1 KiB
C
33 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __COW_H__
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#define __COW_H__
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#include <asm/types.h>
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extern int init_cow_file(int fd, char *cow_file, char *backing_file,
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int sectorsize, int alignment, int *bitmap_offset_out,
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unsigned long *bitmap_len_out, int *data_offset_out);
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extern int file_reader(__u64 offset, char *buf, int len, void *arg);
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extern int read_cow_header(int (*reader)(__u64, char *, int, void *),
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void *arg, __u32 *version_out,
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char **backing_file_out, long long *mtime_out,
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unsigned long long *size_out, int *sectorsize_out,
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__u32 *align_out, int *bitmap_offset_out);
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extern int write_cow_header(char *cow_file, int fd, char *backing_file,
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int sectorsize, int alignment,
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unsigned long long *size);
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extern void cow_sizes(int version, __u64 size, int sectorsize, int align,
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int bitmap_offset, unsigned long *bitmap_len_out,
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int *data_offset_out);
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#endif
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/*
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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