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-rw-r--r--kernel/test/s5fstest.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/kernel/test/s5fstest.c b/kernel/test/s5fstest.c
new file mode 100644
index 0000000..c60ee32
--- /dev/null
+++ b/kernel/test/s5fstest.c
@@ -0,0 +1,251 @@
+//
+// Tests some edge cases of s5fs
+//
+
+#include "errno.h"
+#include "globals.h"
+
+#include "test/usertest.h"
+
+#include "util/debug.h"
+#include "util/printf.h"
+#include "util/string.h"
+
+#include "fs/fcntl.h"
+#include "fs/lseek.h"
+#include "fs/s5fs/s5fs.h"
+#include "fs/vfs_syscall.h"
+
+#define BUFSIZE 256
+#define BIG_BUFSIZE 2056
+
+static void get_file_name(char *buf, size_t sz, long fileno)
+{
+ snprintf(buf, sz, "file%ld", fileno);
+}
+
+// Write to a fail forever until it is either filled up or we get an error.
+static long write_until_fail(int fd)
+{
+ size_t total_written = 0;
+ char buf[BIG_BUFSIZE] = {42};
+ while (total_written < S5_MAX_FILE_SIZE)
+ {
+ long res = do_write(fd, buf, BIG_BUFSIZE);
+ if (res < 0)
+ {
+ return res;
+ }
+ total_written += res;
+ }
+ KASSERT(total_written == S5_MAX_FILE_SIZE);
+ KASSERT(do_lseek(fd, 0, SEEK_END) == S5_MAX_FILE_SIZE);
+
+ return 0;
+}
+
+// Read n bytes from the file, and check they're all 0
+// We do this in increments of big_bufsize because we might want to read
+// like a million bytes from the file
+static long is_first_n_bytes_zero(int fd, size_t n)
+{
+ size_t total_read = 0;
+ while (total_read < n)
+ {
+ size_t amt_to_read = MIN(BIG_BUFSIZE, n - total_read);
+ char buf[BIG_BUFSIZE] = {1};
+ long res = do_read(fd, buf, amt_to_read);
+ if ((size_t)res != amt_to_read)
+ {
+ dbg(DBG_TESTFAIL, "do_read result was %ld\n", res);
+ return 0;
+ }
+ total_read += res;
+
+ // Check everything that we read is indeed 0
+ // TODO use gcc intrinsic to just scan for first non-zero
+ for (size_t i = 0; i < amt_to_read; i++)
+ {
+ if (buf[i])
+ {
+ dbg(DBG_TESTFAIL, "buf contains char %d\n", buf[i]);
+ return 0;
+ }
+ }
+ }
+
+ return 1;
+}
+
+static void test_running_out_of_inodes()
+{
+ // Open a ton of files until we get an error
+ long res;
+ long fileno = 0;
+ char filename[BUFSIZE];
+
+ // open files til we get an error
+ while (1)
+ {
+ get_file_name(filename, BUFSIZE, fileno);
+ res = do_open(filename, O_RDONLY | O_CREAT);
+ if (res >= 0)
+ {
+ fileno++;
+ test_assert(do_close((int)res) == 0, "couldn't close");
+ }
+ else
+ {
+ break;
+ }
+ }
+ test_assert(res == -ENOSPC, "Did not get ENOSPC error");
+
+ // make sure mkdir fails now that we're out of inodes
+ test_assert(do_mkdir("directory") < 0, "do_mkdir worked!?");
+ test_assert(res == -ENOSPC, "unexpected error");
+
+ test_assert(do_mknod("nod", S_IFCHR, 123) != 0, "mknod worked!?");
+ test_assert(res == -ENOSPC, "wrong error code");
+
+ // the last file we tried to open failed
+ fileno--;
+
+ do
+ {
+ get_file_name(filename, BUFSIZE, fileno);
+ res = do_unlink(filename);
+ test_assert(res == 0, "couldnt unlink");
+ fileno--;
+ } while (fileno >= 0);
+
+ // Now we've freed all the files, try to create another file
+ int fd = (int)do_open("file", O_RDONLY | O_CREAT);
+ test_assert(fd >= 0, "Still cannot create files");
+ test_assert(do_close(fd) == 0, "Could not do_close fd");
+ test_assert(do_unlink("file") == 0, "Could not remove file");
+}
+
+static void test_filling_file()
+{
+ long res = 0;
+ int fd = (int)do_open("hugefile", O_RDWR | O_CREAT);
+ KASSERT(fd >= 0);
+
+ res = write_until_fail(fd);
+ test_assert(res == 0, "Did not write to entire file");
+
+ // make sure all other writes are unsuccessful/dont complete
+ char buf[BIG_BUFSIZE] = {0};
+ res = do_write(fd, buf, sizeof(buf));
+ test_assert(res < 0, "Able to write although the file is full");
+ test_assert(res == -EFBIG || res == -EINVAL, "Wrong error code");
+
+ test_assert(do_close(fd) == 0, "couldnt close hugefile");
+ test_assert(do_unlink("hugefile") == 0, "couldnt unlink hugefile");
+}
+
+// Fill up the disk. Apparently to do this, we should need to fill up one
+// entire file, then start to fill up another. We should eventually get
+// the ENOSPC error
+static void test_running_out_of_blocks()
+{
+ long res = 0;
+
+ int fd1 = (int)do_open("fullfile", O_RDWR | O_CREAT);
+
+ res = write_until_fail(fd1);
+ test_assert(res == 0, "Ran out of space quicker than we expected");
+ test_assert(do_close(fd1) == 0, "could not close");
+
+ int fd2 = (int)do_open("partiallyfullfile", O_RDWR | O_CREAT);
+ res = write_until_fail(fd2);
+ test_assert(res == -ENOSPC, "Did not get nospc error");
+
+ test_assert(do_close(fd2) == 0, "could not close");
+
+ test_assert(do_unlink("fullfile") == 0, "couldnt do_unlink file");
+ test_assert(do_unlink("partiallyfullfile") == 0, "couldnt do_unlink file");
+}
+
+// Open a new file, write to some random address in the file,
+// and make sure everything up to that is all 0s.
+static int test_sparseness_direct_blocks()
+{
+ const char *filename = "sparsefile";
+ int fd = (int)do_open(filename, O_RDWR | O_CREAT);
+
+ // Now write to some random address that'll be in a direct block
+ const int addr = 10000;
+ const char *b = "iboros";
+ const size_t sz = strlen(b);
+
+ test_assert(do_lseek(fd, addr, SEEK_SET) == addr, "couldnt seek");
+ test_assert((size_t)do_write(fd, b, sz) == sz,
+ "couldnt write to random address");
+
+ test_assert(do_lseek(fd, 0, SEEK_SET) == 0, "couldnt seek back to begin");
+ test_assert(is_first_n_bytes_zero(fd, addr) == 1,
+ "sparseness for direct blocks failed");
+
+ // Get rid of this file
+ test_assert(do_close(fd) == 0, "couldn't close file");
+ test_assert(do_unlink(filename) == 0, "couldnt unlink file");
+
+ return 0;
+}
+
+static int test_sparseness_indirect_blocks()
+{
+ const char *filename = "bigsparsefile";
+ int fd = (int)do_open(filename, O_RDWR | O_CREAT);
+
+ // Now write to some random address that'll be in an indirect block
+ const int addr = 1000000;
+ const char *b = "iboros";
+ const size_t sz = strlen(b);
+
+ test_assert(do_lseek(fd, addr, SEEK_SET) == addr, "couldnt seek");
+ test_assert((size_t)do_write(fd, b, sz) == sz,
+ "couldnt write to random address");
+
+ test_assert(do_lseek(fd, 0, SEEK_SET) == 0, "couldnt seek back to begin");
+ test_assert(is_first_n_bytes_zero(fd, addr) == 1,
+ "sparseness for indirect blocks failed");
+
+ // Get rid of this file
+ test_assert(do_close(fd) == 0, "couldn't close file");
+ test_assert(do_unlink(filename) == 0, "couldnt unlink file");
+
+ return 0;
+}
+
+long s5fstest_main(int arg0, void *arg1)
+{
+ dbg(DBG_TEST, "\nStarting S5FS test\n");
+
+ test_init();
+
+ KASSERT(do_mkdir("s5fstest") == 0);
+ KASSERT(do_chdir("s5fstest") == 0);
+ dbg(DBG_TEST, "Test dir initialized\n");
+
+ dbg(DBG_TEST, "Testing sparseness for direct blocks\n");
+ test_sparseness_direct_blocks();
+ dbg(DBG_TEST, "Testing sparseness for indirect blocks\n");
+ test_sparseness_indirect_blocks();
+
+ dbg(DBG_TEST, "Testing running out of inodes\n");
+ test_running_out_of_inodes();
+ dbg(DBG_TEST, "Testing filling a file to max capacity\n");
+ test_filling_file();
+ dbg(DBG_TEST, "Testing using all available blocks on disk\n");
+ test_running_out_of_blocks();
+
+ test_assert(do_chdir("..") == 0, "");
+ test_assert(do_rmdir("s5fstest") == 0, "");
+
+ test_fini();
+
+ return 0;
+} \ No newline at end of file
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