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filestore: make SNAP_DESTROY ioctl check more informative

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Tell user about user_subvol_rm_allowed mount option.

Signed-off-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Sage Weil 2012-05-24 15:01:39 -07:00
parent 07c9eda2b1
commit ba5406235f
1 changed files with 12 additions and 6 deletions
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18
src/os/FileStore.cc
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@ -1357,19 +1357,25 @@ int FileStore::_detect_fs()
dout(0) << "mount btrfs SNAP_DESTROY is supported" << dendl;
btrfs_snap_destroy = true;
} else {
err = -errno;
dout(0) << "mount btrfs SNAP_DESTROY failed: " << cpp_strerror(err) << dendl;
if (err == -EPERM && getuid() != 0) {
dout(0) << "btrfs SNAP_DESTROY failed with EPERM as non-root; remount with -o user_subvol_rm_allowed" << dendl;
cerr << TEXT_YELLOW
<< "btrfs SNAP_DESTROY failed as non-root; remount with -o user_subvol_rm_allowed"
<< TEXT_NORMAL
<< std::endl;
} else if (err == -EOPNOTSUPP) {
derr << "btrfs SNAP_DESTROY ioctl not supported; you need a kernel newer than 2.6.32" << dendl;
}
}
} else {
dout(0) << "mount btrfs SNAP_CREATE failed: " << cpp_strerror(err) << dendl;
}
if (m_filestore_btrfs_snap && !btrfs_snap_destroy) {
dout(0) << "mount btrfs snaps enabled, but no SNAP_DESTROY ioctl (from kernel 2.6.32+); DISABLING" << dendl;
cerr << TEXT_YELLOW
<< " ** WARNING: 'filestore btrfs snap' was enabled (for safe transactions, rollback),\n"
<< " but btrfs does not support the SNAP_DESTROY ioctl (added in\n"
<< " Linux 2.6.32). Disabling.\n"
<< TEXT_NORMAL;
dout(0) << "mount btrfs snaps enabled, but no SNAP_DESTROY ioctl; DISABLING" << dendl;
btrfs_stable_commits = false;
}