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open_by_handle: add option -z to query file handle size

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Instead of using MAX_HANDLE_SZ, query the filesystem buffer size
and use that buffer size to get the file handle.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Eryu Guan <guaneryu@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Amir Goldstein
2020-06-14 10:01:08 +03:00
committed by Eryu Guan
parent a38e45b19d
commit 3f4760c2e7
1 changed files with 24 additions and 3 deletions
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src/open_by_handle.c
+24 -3
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@@ -114,6 +114,7 @@ void usage(void)
fprintf(stderr, "open_by_handle -i <handles_file> <test_dir> [N] - read test files handles from file and try to open by handle\n");
fprintf(stderr, "open_by_handle -o <handles_file> <test_dir> [N] - get file handles of test files and write handles to file\n");
fprintf(stderr, "open_by_handle -s <test_dir> [N] - wait in sleep loop after opening files by handle to keep them open\n");
fprintf(stderr, "open_by_handle -z <test_dir> [N] - query filesystem required buffer size\n");
exit(EXIT_FAILURE);
}
@@ -136,11 +137,12 @@ int main(int argc, char **argv)
int create = 0, delete = 0, nlink = 1, move = 0;
int rd = 0, wr = 0, wrafter = 0, parent = 0;
int keepopen = 0, drop_caches = 1, sleep_loop = 0;
int bufsz = MAX_HANDLE_SZ;
if (argc < 2)
usage();
while ((c = getopt(argc, argv, "cludmrwapknhi:o:s")) != -1) {
while ((c = getopt(argc, argv, "cludmrwapknhi:o:sz")) != -1) {
switch (c) {
case 'c':
create = 1;
@@ -199,6 +201,9 @@ int main(int argc, char **argv)
case 's':
sleep_loop = 1;
break;
case 'z':
bufsz = 0;
break;
default:
fprintf(stderr, "illegal option '%s'\n", argv[optind]);
case 'h':
@@ -300,8 +305,16 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
} else {
handle[i].fh.handle_bytes = MAX_HANDLE_SZ;
handle[i].fh.handle_bytes = bufsz;
ret = name_to_handle_at(AT_FDCWD, fname, &handle[i].fh, &mount_id, 0);
if (bufsz < handle[i].fh.handle_bytes) {
/* Query the filesystem required bufsz and the file handle */
if (ret != -1 || errno != EOVERFLOW) {
fprintf(stderr, "Unexpected result from name_to_handle_at(%s)\n", fname);
return EXIT_FAILURE;
}
ret = name_to_handle_at(AT_FDCWD, fname, &handle[i].fh, &mount_id, 0);
}
if (ret < 0) {
strcat(fname, ": name_to_handle");
perror(fname);
@@ -334,8 +347,16 @@ int main(int argc, char **argv)
return EXIT_FAILURE;
}
} else {
dir_handle.fh.handle_bytes = MAX_HANDLE_SZ;
dir_handle.fh.handle_bytes = bufsz;
ret = name_to_handle_at(AT_FDCWD, test_dir, &dir_handle.fh, &mount_id, 0);
if (bufsz < dir_handle.fh.handle_bytes) {
/* Query the filesystem required bufsz and the file handle */
if (ret != -1 || errno != EOVERFLOW) {
fprintf(stderr, "Unexpected result from name_to_handle_at(%s)\n", dname);
return EXIT_FAILURE;
}
ret = name_to_handle_at(AT_FDCWD, test_dir, &dir_handle.fh, &mount_id, 0);
}
if (ret < 0) {
strcat(dname, ": name_to_handle");
perror(dname);