Package: zfs-fuse
Version: 0.7.0-12
Severity: important
Tags: upstream patch
Dear Maintainer,
I see exactly the behavior described in
https://groups.google.com/forum/#!topic/zfs-fuse/-BtjGFUPOyk:
Removing the com.sun:auto-snapshot-desc property as descibed in the
command by user hornowitz did not help for me, though.
# zfs list -r -t snapshot -H zpool | wc -l
504
# zdb -d zpool | grep "^Dataset .*@" | wc -l
913
I can list any property of the missing snapshots if I name the snapshot
on the command line, it exists but is just missing in the output of "zfs
list -t snapshot <fs>".
After some debugging, I found the root cause in src/lib/libzfs/libzfs_dataset.c:
2425 static int
2426 zfs_do_list_ioctl(zfs_handle_t *zhp, int arg, zfs_cmd_t *zc)
2427 {
2428 int rc;
2429 uint64_t orig_cookie;
2430
2431 orig_cookie = zc->zc_cookie;
2432 top:
2433 (void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));
2434 rc = ioctl(zhp->zfs_hdl->libzfs_fd, arg, zc);
2435
2436 if (rc == -1) {
2437 switch (errno) {
2438 case ENOMEM:
2439 /* expand nvlist memory and try again */
2440 if (zcmd_expand_dst_nvlist(zhp->zfs_hdl, zc) != 0) {
2441 zcmd_free_nvlists(zc);
2442 return (-1);
2443 }
This code assumes ioctl() returns either 0 or -1, but I'm occasionally getting
12 (=ENOMEM) here. After changing the condition in line 2436 to just "if (rc)"
and recompiling the zfs command the output of "zfs list -r -t snapshot" matches
the output of zdb.
Kind regards,
Michael
-- System Information:
Debian Release: 7.8
APT prefers stable
APT policy: (500, 'stable')
Architecture: armhf (armv7l)
Kernel: Linux 3.4.104+ (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=C, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages zfs-fuse depends on:
ii fuse 2.9.0-2+deb7u1
ii libaio1 0.3.109-3
ii libc6 2.13-38+deb7u8
ii libfuse2 2.9.0-2+deb7u1
ii libgcc1 1:4.7.2-5
ii libssl1.0.0 1.0.1e-2+deb7u14
ii lsb-base 4.1+Debian8+deb7u1
ii zlib1g 1:1.2.7.dfsg-13
zfs-fuse recommends no packages.
Versions of packages zfs-fuse suggests:
pn kpartx <none>
ii nfs-kernel-server 1:1.2.6-4
-- Configuration Files:
/etc/zfs/zfsrc changed [not included]
-- no debconf information
--- ./src/lib/libzfs/libzfs_dataset.c.orig 2015-03-11 21:36:13.000000000 +0100
+++ ./src/lib/libzfs/libzfs_dataset.c 2015-03-11 21:36:24.000000000 +0100
@@ -2433,7 +2433,7 @@
(void) strlcpy(zc->zc_name, zhp->zfs_name, sizeof (zc->zc_name));
rc = ioctl(zhp->zfs_hdl->libzfs_fd, arg, zc);
- if (rc == -1) {
+ if (rc) {
switch (errno) {
case ENOMEM:
/* expand nvlist memory and try again */
