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add ZFS_ENTER protection to .zfs/snapshot vnode operations that need it

Browse source 
Those operations, zfsctl_snapdir_readdir and zfsctl_snapdir_getattr,
access the filesystem's objset and it can be unstable during operations
like receive and rollback.

MFC after:	2 weeks
This commit is contained in:
Andriy Gapon 2018-02-27 14:08:54 +00:00
parent 468b6c536a
commit f3b7b054dd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=330057
1 changed files with 8 additions and 1 deletions
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9
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ctldir.c
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@ -1071,6 +1071,7 @@ zfsctl_snapdir_readdir(ap)
return (error);
}
ZFS_ENTER(zfsvfs);
for (;;) {
uint64_t cookie;
uint64_t id;
@ -1087,6 +1088,7 @@ zfsctl_snapdir_readdir(ap)
*eofp = 1;
error = 0;
}
ZFS_EXIT(zfsvfs);
return (error);
}
@ -1099,6 +1101,7 @@ zfsctl_snapdir_readdir(ap)
if (error != 0) {
if (error == ENAMETOOLONG)
error = 0;
ZFS_EXIT(zfsvfs);
return (SET_ERROR(error));
}
uio->uio_offset = cookie + dots_offset;
@ -1122,6 +1125,7 @@ zfsctl_snapdir_getattr(ap)
uint64_t snap_count;
int err;
ZFS_ENTER(zfsvfs);
zfsctl_common_getattr(vp, vap);
vap->va_ctime = dmu_objset_snap_cmtime(zfsvfs->z_os);
vap->va_mtime = vap->va_ctime;
@ -1129,12 +1133,15 @@ zfsctl_snapdir_getattr(ap)
if (dsl_dataset_phys(ds)->ds_snapnames_zapobj != 0) {
err = zap_count(dmu_objset_pool(ds->ds_objset)->dp_meta_objset,
dsl_dataset_phys(ds)->ds_snapnames_zapobj, &snap_count);
if (err != 0)
if (err != 0) {
ZFS_EXIT(zfsvfs);
return (err);
}
vap->va_nlink += snap_count;
}
vap->va_size = vap->va_nlink;
ZFS_EXIT(zfsvfs);
return (0);
}