From: Darrick J. Wong <djwong@xxxxxxxxxx>
Teach this stress tool to be able to use the file content exchange
ioctl.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
ltp/fsstress.c | 168 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 168 insertions(+)
diff --git a/ltp/fsstress.c b/ltp/fsstress.c
index 10608fb554..0fba3d92a0 100644
--- a/ltp/fsstress.c
+++ b/ltp/fsstress.c
@@ -143,6 +143,7 @@ typedef enum {
OP_URING_WRITE,
OP_WRITE,
OP_WRITEV,
+ OP_XCHGRANGE,
OP_LAST
} opty_t;
@@ -272,6 +273,8 @@ void uring_read_f(opnum_t, long);
void uring_write_f(opnum_t, long);
void write_f(opnum_t, long);
void writev_f(opnum_t, long);
+void xchgrange_f(opnum_t, long);
+
char *xattr_flag_to_string(int);
struct opdesc ops[OP_LAST] = {
@@ -340,6 +343,7 @@ struct opdesc ops[OP_LAST] = {
[OP_URING_WRITE] = {"uring_write", uring_write_f, 1, 1 },
[OP_WRITE] = {"write", write_f, 4, 1 },
[OP_WRITEV] = {"writev", writev_f, 4, 1 },
+ [OP_XCHGRANGE] = {"xchgrange", xchgrange_f, 4, 1 },
}, *ops_end;
flist_t flist[FT_nft] = {
@@ -2494,6 +2498,170 @@ chown_f(opnum_t opno, long r)
free_pathname(&f);
}
+/* exchange some arbitrary range of f1 to f2...fn. */
+void
+xchgrange_f(
+ opnum_t opno,
+ long r)
+{
+#ifdef FIEXCHANGE_RANGE
+ struct file_xchg_range fxr = { 0 };
+ static __u64 swap_flags = 0;
+ struct pathname fpath1;
+ struct pathname fpath2;
+ struct stat64 stat1;
+ struct stat64 stat2;
+ char inoinfo1[1024];
+ char inoinfo2[1024];
+ off64_t lr;
+ off64_t off1;
+ off64_t off2;
+ off64_t max_off2;
+ size_t len;
+ int v1;
+ int v2;
+ int fd1;
+ int fd2;
+ int ret;
+ int tries = 0;
+ int e;
+
+ /* Load paths */
+ init_pathname(&fpath1);
+ if (!get_fname(FT_REGm, r, &fpath1, NULL, NULL, &v1)) {
+ if (v1)
+ printf("%d/%lld: xchgrange read - no filename\n",
+ procid, opno);
+ goto out_fpath1;
+ }
+
+ init_pathname(&fpath2);
+ if (!get_fname(FT_REGm, random(), &fpath2, NULL, NULL, &v2)) {
+ if (v2)
+ printf("%d/%lld: xchgrange write - no filename\n",
+ procid, opno);
+ goto out_fpath2;
+ }
+
+ /* Open files */
+ fd1 = open_path(&fpath1, O_RDONLY);
+ e = fd1 < 0 ? errno : 0;
+ check_cwd();
+ if (fd1 < 0) {
+ if (v1)
+ printf("%d/%lld: xchgrange read - open %s failed %d\n",
+ procid, opno, fpath1.path, e);
+ goto out_fpath2;
+ }
+
+ fd2 = open_path(&fpath2, O_WRONLY);
+ e = fd2 < 0 ? errno : 0;
+ check_cwd();
+ if (fd2 < 0) {
+ if (v2)
+ printf("%d/%lld: xchgrange write - open %s failed %d\n",
+ procid, opno, fpath2.path, e);
+ goto out_fd1;
+ }
+
+ /* Get file stats */
+ if (fstat64(fd1, &stat1) < 0) {
+ if (v1)
+ printf("%d/%lld: xchgrange read - fstat64 %s failed %d\n",
+ procid, opno, fpath1.path, errno);
+ goto out_fd2;
+ }
+ inode_info(inoinfo1, sizeof(inoinfo1), &stat1, v1);
+
+ if (fstat64(fd2, &stat2) < 0) {
+ if (v2)
+ printf("%d/%lld: xchgrange write - fstat64 %s failed %d\n",
+ procid, opno, fpath2.path, errno);
+ goto out_fd2;
+ }
+ inode_info(inoinfo2, sizeof(inoinfo2), &stat2, v2);
+
+ if (stat1.st_size < (stat1.st_blksize * 2) ||
+ stat2.st_size < (stat2.st_blksize * 2)) {
+ if (v2)
+ printf("%d/%lld: xchgrange - files are too small\n",
+ procid, opno);
+ goto out_fd2;
+ }
+
+ /* Never let us swap more than 1/4 of the files. */
+ len = (random() % FILELEN_MAX) + 1;
+ if (len > stat1.st_size / 4)
+ len = stat1.st_size / 4;
+ if (len > stat2.st_size / 4)
+ len = stat2.st_size / 4;
+ len = rounddown_64(len, stat1.st_blksize);
+ if (len == 0)
+ len = stat1.st_blksize;
+
+ /* Calculate offsets */
+ lr = ((int64_t)random() << 32) + random();
+ if (stat1.st_size == len)
+ off1 = 0;
+ else
+ off1 = (off64_t)(lr % MIN(stat1.st_size - len, MAXFSIZE));
+ off1 %= maxfsize;
+ off1 = rounddown_64(off1, stat1.st_blksize);
+
+ /*
+ * If srcfile == destfile, randomly generate destination ranges
+ * until we find one that doesn't overlap the source range.
+ */
+ max_off2 = MIN(stat2.st_size - len, MAXFSIZE);
+ do {
+ lr = ((int64_t)random() << 32) + random();
+ if (stat2.st_size == len)
+ off2 = 0;
+ else
+ off2 = (off64_t)(lr % max_off2);
+ off2 %= maxfsize;
+ off2 = rounddown_64(off2, stat2.st_blksize);
+ } while (stat1.st_ino == stat2.st_ino &&
+ llabs(off2 - off1) < len &&
+ tries++ < 10);
+
+ /* Swap data blocks */
+ fxr.file1_fd = fd1;
+ fxr.file1_offset = off1;
+ fxr.length = len;
+ fxr.file2_offset = off2;
+ fxr.flags = swap_flags;
+
+retry:
+ ret = ioctl(fd2, FIEXCHANGE_RANGE, &fxr);
+ e = ret < 0 ? errno : 0;
+ if (e == EOPNOTSUPP && !(swap_flags & FILE_XCHG_RANGE_NONATOMIC)) {
+ swap_flags = FILE_XCHG_RANGE_NONATOMIC;
+ fxr.flags |= swap_flags;
+ goto retry;
+ }
+ if (v1 || v2) {
+ printf("%d/%lld: xchgrange %s%s [%lld,%lld] -> %s%s [%lld,%lld]",
+ procid, opno,
+ fpath1.path, inoinfo1, (long long)off1, (long long)len,
+ fpath2.path, inoinfo2, (long long)off2, (long long)len);
+
+ if (ret < 0)
+ printf(" error %d", e);
+ printf("\n");
+ }
+
+out_fd2:
+ close(fd2);
+out_fd1:
+ close(fd1);
+out_fpath2:
+ free_pathname(&fpath2);
+out_fpath1:
+ free_pathname(&fpath1);
+#endif
+}
+
/* reflink some arbitrary range of f1 to f2. */
void
clonerange_f(
