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open_by_handle: test file handles of renamed files

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usage: open_by_handle -m <test_dir> [N]

Get file handles for existing test set, rename all test files,
drop cache and try to open all files by handle.

This is needed for testing that overlayfs can find the upper
inode from lower file handle even when upper is not in the same
path as lower.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
This commit is contained in:
Amir Goldstein
2017-11-02 12:15:34 +02:00
committed by Eryu Guan
parent 80bfe0c158
commit 91a6f4c577
1 changed files with 26 additions and 5 deletions
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src/open_by_handle.c
+26 -5
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@@ -27,7 +27,7 @@
/*
usage: open_by_handle [-c|-l|-u|-d] <test_dir> [num_files]
usage: open_by_handle [-cludm] <test_dir> [num_files]
Examples:
@@ -48,7 +48,12 @@ Examples:
open_by_handle -d <test_dir> [N]
4. Get file handles for existing test set, hardlink all test files,
4. Get file handles for existing test set, rename all test files,
drop caches, try to open all files by handle (should work):
open_by_handle -m <test_dir> [N]
5. Get file handles for existing test set, hardlink all test files,
then unlink the original files, drop caches and try to open all
files by handle (should work):
@@ -84,13 +89,14 @@ struct handle {
void usage(void)
{
fprintf(stderr, "usage: open_by_handle [-c|-l|-u|-d] <test_dir> [num_files]\n");
fprintf(stderr, "usage: open_by_handle [-cludm] <test_dir> [num_files]\n");
fprintf(stderr, "\n");
fprintf(stderr, "open_by_handle -c <test_dir> [N] - create N test files under test_dir, try to get file handles and exit\n");
fprintf(stderr, "open_by_handle <test_dir> [N] - get file handles of test files, drop caches and try to open by handle\n");
fprintf(stderr, "open_by_handle -l <test_dir> [N] - create hardlinks to test files, drop caches and try to open by handle\n");
fprintf(stderr, "open_by_handle -u <test_dir> [N] - unlink (hardlinked) test files, drop caches and try to open by handle\n");
fprintf(stderr, "open_by_handle -d <test_dir> [N] - unlink test files and hardlinks, drop caches and try to open by handle\n");
fprintf(stderr, "open_by_handle -m <test_dir> [N] - rename test files, drop caches and try to open by handle\n");
exit(EXIT_FAILURE);
}
@@ -105,12 +111,12 @@ int main(int argc, char **argv)
char *test_dir;
int mount_fd, mount_id;
int numfiles = 1;
int create = 0, delete = 0, nlink = 1;
int create = 0, delete = 0, nlink = 1, move = 0;
if (argc < 2 || argc > 4)
usage();
while ((c = getopt(argc, argv, "clud")) != -1) {
while ((c = getopt(argc, argv, "cludm")) != -1) {
switch (c) {
case 'c':
create = 1;
@@ -126,6 +132,9 @@ int main(int argc, char **argv)
delete = 1;
nlink = 0;
break;
case 'm':
move = 1;
break;
default:
fprintf(stderr, "illegal option '%s'\n", argv[optind]);
case 'h':
@@ -201,6 +210,18 @@ int main(int argc, char **argv)
}
}
/* rename the files */
for (i=0; move && i < numfiles; i++) {
sprintf(fname, "%s/file%06d", test_dir, i);
sprintf(fname2, "%s/link%06d", test_dir, i);
ret = rename(fname, fname2);
if (ret < 0) {
strcat(fname2, ": rename");
perror(fname2);
return EXIT_FAILURE;
}
}
/* unlink the files */
for (i=0; delete && i < numfiles; i++) {
sprintf(fname, "%s/file%06d", test_dir, i);