xentrace: Add option to reserve disk space
Before writing records, xentrace will check to make sure that there is a
minimum amount of space left on the output filesystem.
Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
diff -r c8b6db963a29 tools/xentrace/xentrace.c
--- a/tools/xentrace/xentrace.c Mon Feb 25 15:49:36 2008 +0000
+++ b/tools/xentrace/xentrace.c Mon Feb 25 15:53:22 2008 +0000
@@ -15,6 +15,7 @@
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
+#include <sys/vfs.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
@@ -53,6 +54,7 @@ typedef struct settings_st {
uint32_t evt_mask;
uint32_t cpu_mask;
unsigned long tbuf_size;
+ unsigned long disk_rsvd;
uint8_t discard:1;
} settings_t;
@@ -83,8 +85,36 @@ void write_buffer(unsigned int cpu, unsi
void write_buffer(unsigned int cpu, unsigned char *start, int size,
int total_size, int outfd)
{
+ struct statfs stat;
size_t written = 0;
+ if ( opts.disk_rsvd != 0 )
+ {
+ unsigned long long freespace;
+
+ /* Check that filesystem has enough space. */
+ if ( fstatfs (outfd, &stat) )
+ {
+ fprintf(stderr, "Statfs failed!\n");
+ goto fail;
+ }
+
+ freespace = stat.f_bsize * (unsigned long long)stat.f_bfree;
+
+ if ( total_size )
+ freespace -= total_size;
+ else
+ freespace -= size;
+
+ freespace >>= 20; /* Convert to MB */
+
+ if ( freespace <= opts.disk_rsvd )
+ {
+ fprintf(stderr, "Disk space limit reached (free space: %lluMB,
limit: %luMB).\n", freespace, opts.disk_rsvd);
+ exit (EXIT_FAILURE);
+ }
+ }
+
/* Write a CPU_BUF record on each buffer "window" written. Wrapped
* windows may involve two writes, so only write the record on the
* first write. */
@@ -541,6 +571,7 @@ void parse_args(int argc, char **argv)
{ "cpu-mask", required_argument, 0, 'c' },
{ "evt-mask", required_argument, 0, 'e' },
{ "trace-buf-size", required_argument, 0, 'S' },
+ { "reserve-disk-space", required_argument, 0, 'r' },
{ "discard-buffers", no_argument, 0, 'D' },
{ "help", no_argument, 0, '?' },
{ "version", no_argument, 0, 'V' },
@@ -572,11 +603,15 @@ void parse_args(int argc, char **argv)
printf("%s\n", program_version);
exit(EXIT_SUCCESS);
break;
-
+
case 'D': /* Discard traces currently in buffer */
opts.discard = 1;
break;
-
+
+ case 'r': /* Disk-space reservation */
+ opts.disk_rsvd = argtol(optarg, 0);
+ break;
+
default:
usage();
}
@@ -604,6 +639,7 @@ int main(int argc, char **argv)
opts.poll_sleep = POLL_SLEEP_MILLIS;
opts.evt_mask = 0;
opts.cpu_mask = 0;
+ opts.disk_rsvd = 0;
parse_args(argc, argv);
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