diff options
Diffstat (limited to 'qemu-io.c')
-rw-r--r-- | qemu-io.c | 88 |
1 files changed, 88 insertions, 0 deletions
@@ -1394,6 +1394,93 @@ static const cmdinfo_t info_cmd = { .oneline = "prints information about the current file", }; +static void +discard_help(void) +{ + printf( +"\n" +" discards a range of bytes from the given offset\n" +"\n" +" Example:\n" +" 'discard 512 1k' - discards 1 kilobyte from 512 bytes into the file\n" +"\n" +" Discards a segment of the currently open file.\n" +" -C, -- report statistics in a machine parsable format\n" +" -q, -- quite mode, do not show I/O statistics\n" +"\n"); +} + +static int discard_f(int argc, char **argv); + +static const cmdinfo_t discard_cmd = { + .name = "discard", + .altname = "d", + .cfunc = discard_f, + .argmin = 2, + .argmax = -1, + .args = "[-Cq] off len", + .oneline = "discards a number of bytes at a specified offset", + .help = discard_help, +}; + +static int +discard_f(int argc, char **argv) +{ + struct timeval t1, t2; + int Cflag = 0, qflag = 0; + int c, ret; + int64_t offset; + int count; + + while ((c = getopt(argc, argv, "Cq")) != EOF) { + switch (c) { + case 'C': + Cflag = 1; + break; + case 'q': + qflag = 1; + break; + default: + return command_usage(&discard_cmd); + } + } + + if (optind != argc - 2) { + return command_usage(&discard_cmd); + } + + offset = cvtnum(argv[optind]); + if (offset < 0) { + printf("non-numeric length argument -- %s\n", argv[optind]); + return 0; + } + + optind++; + count = cvtnum(argv[optind]); + if (count < 0) { + printf("non-numeric length argument -- %s\n", argv[optind]); + return 0; + } + + gettimeofday(&t1, NULL); + ret = bdrv_discard(bs, offset, count); + gettimeofday(&t2, NULL); + + if (ret < 0) { + printf("discard failed: %s\n", strerror(-ret)); + goto out; + } + + /* Finally, report back -- -C gives a parsable format */ + if (!qflag) { + t2 = tsub(t2, t1); + print_report("discard", &t2, offset, count, count, 1, Cflag); + } + +out: + return 0; +} + static int alloc_f(int argc, char **argv) { @@ -1715,6 +1802,7 @@ int main(int argc, char **argv) add_command(&truncate_cmd); add_command(&length_cmd); add_command(&info_cmd); + add_command(&discard_cmd); add_command(&alloc_cmd); add_command(&map_cmd); |