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gerrit-public.fairphone.software / platform / external / e2fsprogs / f5589f4c189a2d6b34fcd10570c496ca568e0aee / . / lib / ext2fs / io_manager.c
blob: 34e48592748e45e3c36db24676307242a59bc818 [file] [log] [blame]
Theodore Ts'o2e8ca9a2004-11-30 14:07:11 -0500[diff] [blame]1/*
2 * io_manager.c --- the I/O manager abstraction
3 */
4
Theodore Ts'od1154eb2011-09-18 17:34:37 -0400[diff] [blame]5#include "config.h"
Theodore Ts'o2e8ca9a2004-11-30 14:07:11 -0500[diff] [blame]6#include <stdio.h>
7#include <string.h>
8#if HAVE_UNISTD_H
9#include <unistd.h>
10#endif
11#include <fcntl.h>
12#include <time.h>
13#if HAVE_SYS_STAT_H
14#include <sys/stat.h>
15#endif
16#if HAVE_SYS_TYPES_H
17#include <sys/types.h>
18#endif
19
20#include "ext2_fs.h"
21#include "ext2fs.h"
22
23errcode_t io_channel_set_options(io_channel channel, const char *opts)
24{
25 errcode_t retval = 0;
26 char *next, *ptr, *options, *arg;
27
28 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
29
30 if (!opts)
31 return 0;
32
33 if (!channel->manager->set_option)
34 return EXT2_ET_INVALID_ARGUMENT;
35
36 options = malloc(strlen(opts)+1);
37 if (!options)
38 return EXT2_ET_NO_MEMORY;
39 strcpy(options, opts);
40 ptr = options;
41
42 while (ptr && *ptr) {
43 next = strchr(ptr, '&');
44 if (next)
45 *next++ = 0;
46
47 arg = strchr(ptr, '=');
48 if (arg)
49 *arg++ = 0;
50
51 retval = (channel->manager->set_option)(channel, ptr, arg);
52 if (retval)
53 break;
54 ptr = next;
55 }
56 free(options);
57 return retval;
58}
59
60errcode_t io_channel_write_byte(io_channel channel, unsigned long offset,
61 int count, const void *data)
62{
63 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
64
Theodore Ts'oefc6f622008-08-27 23:07:54 -0400[diff] [blame]65 if (channel->manager->write_byte)
66 return channel->manager->write_byte(channel, offset,
Theodore Ts'o2e8ca9a2004-11-30 14:07:11 -0500[diff] [blame]67 count, data);
68
69 return EXT2_ET_UNIMPLEMENTED;
70}
Theodore Ts'o4690e622008-08-27 21:46:26 -0400[diff] [blame]71
72errcode_t io_channel_read_blk64(io_channel channel, unsigned long long block,
73 int count, void *data)
74{
75 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
76
77 if (channel->manager->read_blk64)
78 return (channel->manager->read_blk64)(channel, block,
79 count, data);
80
81 if ((block >> 32) != 0)
82 return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
83
84 return (channel->manager->read_blk)(channel, (unsigned long) block,
85 count, data);
86}
87
88errcode_t io_channel_write_blk64(io_channel channel, unsigned long long block,
89 int count, const void *data)
90{
91 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
92
93 if (channel->manager->write_blk64)
94 return (channel->manager->write_blk64)(channel, block,
95 count, data);
96
97 if ((block >> 32) != 0)
98 return EXT2_ET_IO_CHANNEL_NO_SUPPORT_64;
99
100 return (channel->manager->write_blk)(channel, (unsigned long) block,
101 count, data);
102}
Lukas Czernere90a59e2010-11-18 03:38:36 +0000[diff] [blame]103
104errcode_t io_channel_discard(io_channel channel, unsigned long long block,
105 unsigned long long count)
106{
107 EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
108
109 if (channel->manager->discard)
110 return (channel->manager->discard)(channel, block, count);
111
112 return EXT2_ET_UNIMPLEMENTED;
113}
Theodore Ts'ofd1c5a02012-05-07 14:41:49 -0400[diff] [blame]114
115errcode_t io_channel_alloc_buf(io_channel io, int count, void *ptr)
116{
117 size_t size;
118
119 if (count == 0)
120 size = io->block_size;
121 else if (count > 0)
122 size = io->block_size * count;
123 else
124 size = -count;
125
126 if (io->align)
127 return ext2fs_get_memalign(size, io->align, ptr);
128 else
129 return ext2fs_get_mem(size, ptr);
130}