On Wed, Nov 08, 2017 at 12:10:08PM +0800, Eryu Guan wrote:
> On Thu, Nov 02, 2017 at 12:15:34PM +0200, Amir Goldstein wrote:
> > 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@xxxxxxxxx>
> > ---
> > src/open_by_handle.c | 31 ++++++++++++++++++++++++++-----
> > 1 file changed, 26 insertions(+), 5 deletions(-)
> >
> > diff --git a/src/open_by_handle.c b/src/open_by_handle.c
> > index 52973c6..8b12df3 100644
> > --- a/src/open_by_handle.c
> > +++ b/src/open_by_handle.c
> > @@ -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);
>
> Should we choose another prefix for moved files? "link" is used for
> hardlink files already, use something like "move"? (I can fix it up if
> you agree to do so.)
Ah, seems this is not a trivial fixup as I thought, patch 4 depends on
the file name prefix of moved files to be "link" too.
Thanks,
Eryu
>
> > + 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);
> > --
> > 2.7.4
> >
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