io.c (32cc71def9e3885f9527af713e6d8dc7521ddc08) io.c (353a5d84b25c335b259f37c4f43dad96e6d60ba8)
1/*
2 * Block layer I/O functions
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

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1095 offset += bytes;
1096 }
1097}
1098
1099/* See bdrv_pwrite() for the return codes */
1100int bdrv_pread(BdrvChild *child, int64_t offset, int64_t bytes, void *buf,
1101 BdrvRequestFlags flags)
1102{
1/*
2 * Block layer I/O functions
3 *
4 * Copyright (c) 2003 Fabrice Bellard
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights

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1095 offset += bytes;
1096 }
1097}
1098
1099/* See bdrv_pwrite() for the return codes */
1100int bdrv_pread(BdrvChild *child, int64_t offset, int64_t bytes, void *buf,
1101 BdrvRequestFlags flags)
1102{
1103 int ret;
1104 QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
1105 IO_CODE();
1106
1107 if (bytes < 0) {
1108 return -EINVAL;
1109 }
1110
1103 QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
1104 IO_CODE();
1105
1106 if (bytes < 0) {
1107 return -EINVAL;
1108 }
1109
1111 ret = bdrv_preadv(child, offset, bytes, &qiov, flags);
1112
1113 return ret < 0 ? ret : bytes;
1110 return bdrv_preadv(child, offset, bytes, &qiov, flags);
1114}
1115
1116/* Return no. of bytes on success or < 0 on error. Important errors are:
1117 -EIO generic I/O error (may happen for all errors)
1118 -ENOMEDIUM No media inserted.
1119 -EINVAL Invalid offset or number of bytes
1120 -EACCES Trying to write a read-only device
1121*/
1122int bdrv_pwrite(BdrvChild *child, int64_t offset, int64_t bytes,
1123 const void *buf, BdrvRequestFlags flags)
1124{
1111}
1112
1113/* Return no. of bytes on success or < 0 on error. Important errors are:
1114 -EIO generic I/O error (may happen for all errors)
1115 -ENOMEDIUM No media inserted.
1116 -EINVAL Invalid offset or number of bytes
1117 -EACCES Trying to write a read-only device
1118*/
1119int bdrv_pwrite(BdrvChild *child, int64_t offset, int64_t bytes,
1120 const void *buf, BdrvRequestFlags flags)
1121{
1125 int ret;
1126 QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
1127 IO_CODE();
1128
1129 if (bytes < 0) {
1130 return -EINVAL;
1131 }
1132
1122 QEMUIOVector qiov = QEMU_IOVEC_INIT_BUF(qiov, buf, bytes);
1123 IO_CODE();
1124
1125 if (bytes < 0) {
1126 return -EINVAL;
1127 }
1128
1133 ret = bdrv_pwritev(child, offset, bytes, &qiov, flags);
1134
1135 return ret < 0 ? ret : bytes;
1129 return bdrv_pwritev(child, offset, bytes, &qiov, flags);
1136}
1137
1138/*
1139 * Writes to the file and ensures that no writes are reordered across this
1140 * request (acts as a barrier)
1141 *
1142 * Returns 0 on success, -errno in error cases.
1143 */

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1131
1132/*
1133 * Writes to the file and ensures that no writes are reordered across this
1134 * request (acts as a barrier)
1135 *
1136 * Returns 0 on success, -errno in error cases.
1137 */

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