[PATCH 2/3] fsstress: add the ability to create snapshots

Josef Bacik
2019-11-14T15:58:45Z

Snapshots are just fancy subvolumes, add this ability so we can stress
snapshot creation. We get the deletion with SUBVOL_DELETE.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
---
ltp/fsstress.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)

diff --git a/ltp/fsstress.c b/ltp/fsstress.c
index e0636a12..f7f5f1dc 100644
--- a/ltp/fsstress.c
+++ b/ltp/fsstress.c
@@ -129,6 +129,7 @@ typedef enum {
OP_SETATTR,
OP_SETFATTR,
OP_SETXATTR,
+ OP_SNAPSHOT,
OP_SPLICE,
OP_STAT,
OP_SUBVOL_CREATE,
@@ -255,6 +256,7 @@ void rmdir_f(int, long);
void setattr_f(int, long);
void setfattr_f(int, long);
void setxattr_f(int, long);
+void snapshot_f(int, long);
void splice_f(int, long);
void stat_f(int, long);
void subvol_create_f(int, long);
@@ -322,6 +324,7 @@ opdesc_t ops[] = {
{ OP_SETFATTR, "setfattr", setfattr_f, 2, 1 },
/* set project id (XFS_IOC_FSSETXATTR ioctl) */
{ OP_SETXATTR, "setxattr", setxattr_f, 1, 1 },
+ { OP_SNAPSHOT, "snapshot", snapshot_f, 1, 1 },
{ OP_SPLICE, "splice", splice_f, 1, 1 },
{ OP_STAT, "stat", stat_f, 1, 0 },
{ OP_SUBVOL_CREATE, "subvol_create", subvol_create_f, 1, 1},
@@ -1903,6 +1906,7 @@ zero_freq(void)
#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))

opty_t btrfs_ops[] = {
+ OP_SNAPSHOT,
OP_SUBVOL_CREATE,
OP_SUBVOL_DELETE,
};
@@ -4703,6 +4707,55 @@ out:
free_pathname(&f);
}

+void
+snapshot_f(int opno, long r)
+{
+#ifdef HAVE_BTRFSUTIL_H
+ enum btrfs_util_error e;
+ pathname_t f;
+ pathname_t newf;
+ fent_t *fep;
+ int id;
+ int parid;
+ int v;
+ int v1;
+ int err;
+
+ init_pathname(&f);
+ if (!get_fname(FT_SUBVOLm, r, &f, NULL, &fep, &v)) {
+ if (v)
+ printf("%d/%d: snapshot - no subvolume\n", procid,
+ opno);
+ free_pathname(&f);
+ return;
+ }
+ init_pathname(&newf);
+ parid = fep->id;
+ err = generate_fname(fep, FT_SUBVOL, &newf, &id, &v1);
+ v |= v1;
+ if (!err) {
+ if (v) {
+ (void)fent_to_name(&f, fep);
+ printf("%d/%d: snapshot - no filename from %s\n",
+ procid, opno, f.path);
+ }
+ free_pathname(&f);
+ return;
+ }
+ e = btrfs_util_create_snapshot(f.path, newf.path, 0, NULL, NULL);
+ if (e == BTRFS_UTIL_OK)
+ add_to_flist(FT_SUBVOL, id, parid, 0);
+ if (v) {
+ printf("%d/%d: snapshot %s->%s %d(%s)\n", procid, opno,
+ f.path, newf.path, e, btrfs_util_strerror(e));
+ printf("%d/%d: snapshot add id=%d,parent=%d\n", procid, opno,
+ id, parid);
+ }
+ free_pathname(&newf);
+ free_pathname(&f);
+#endif
+}
+
void
stat_f(int opno, long r)
{
--
2.21.0