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![Linus Torvalds](/assets/img/avatar_default.png)
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Merge tag 'idmapped-mounts-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux
Pull idmapped mounts from Christian Brauner:
"This introduces idmapped mounts which has been in the making for some
time. Simply put, different mounts can expose the same file or
directory with different ownership. This initial implementation comes
with ports for fat, ext4 and with Christoph's port for xfs with more
filesystems being actively worked on by independent people and
maintainers.
Idmapping mounts handle a wide range of long standing use-cases. Here
are just a few:
- Idmapped mounts make it possible to easily share files between
multiple users or multiple machines especially in complex
scenarios. For example, idmapped mounts will be used in the
implementation of portable home directories in
systemd-homed.service(8) where they allow users to move their home
directory to an external storage device and use it on multiple
computers where they are assigned different uids and gids. This
effectively makes it possible to assign random uids and gids at
login time.
- It is possible to share files from the host with unprivileged
containers without having to change ownership permanently through
chown(2).
- It is possible to idmap a container's rootfs and without having to
mangle every file. For example, Chromebooks use it to share the
user's Download folder with their unprivileged containers in their
Linux subsystem.
- It is possible to share files between containers with
non-overlapping idmappings.
- Filesystem that lack a proper concept of ownership such as fat can
use idmapped mounts to implement discretionary access (DAC)
permission checking.
- They allow users to efficiently changing ownership on a per-mount
basis without having to (recursively) chown(2) all files. In
contrast to chown (2) changing ownership of large sets of files is
instantenous with idmapped mounts. This is especially useful when
ownership of a whole root filesystem of a virtual machine or
container is changed. With idmapped mounts a single syscall
mount_setattr syscall will be sufficient to change the ownership of
all files.
- Idmapped mounts always take the current ownership into account as
idmappings specify what a given uid or gid is supposed to be mapped
to. This contrasts with the chown(2) syscall which cannot by itself
take the current ownership of the files it changes into account. It
simply changes the ownership to the specified uid and gid. This is
especially problematic when recursively chown(2)ing a large set of
files which is commong with the aforementioned portable home
directory and container and vm scenario.
- Idmapped mounts allow to change ownership locally, restricting it
to specific mounts, and temporarily as the ownership changes only
apply as long as the mount exists.
Several userspace projects have either already put up patches and
pull-requests for this feature or will do so should you decide to pull
this:
- systemd: In a wide variety of scenarios but especially right away
in their implementation of portable home directories.
https://systemd.io/HOME_DIRECTORY/
- container runtimes: containerd, runC, LXD:To share data between
host and unprivileged containers, unprivileged and privileged
containers, etc. The pull request for idmapped mounts support in
containerd, the default Kubernetes runtime is already up for quite
a while now: https://github.com/containerd/containerd/pull/4734
- The virtio-fs developers and several users have expressed interest
in using this feature with virtual machines once virtio-fs is
ported.
- ChromeOS: Sharing host-directories with unprivileged containers.
I've tightly synced with all those projects and all of those listed
here have also expressed their need/desire for this feature on the
mailing list. For more info on how people use this there's a bunch of
talks about this too. Here's just two recent ones:
https://www.cncf.io/wp-content/uploads/2020/12/Rootless-Containers-in-Gitpod.pdf
https://fosdem.org/2021/schedule/event/containers_idmap/
This comes with an extensive xfstests suite covering both ext4 and
xfs:
https://git.kernel.org/brauner/xfstests-dev/h/idmapped_mounts
It covers truncation, creation, opening, xattrs, vfscaps, setid
execution, setgid inheritance and more both with idmapped and
non-idmapped mounts. It already helped to discover an unrelated xfs
setgid inheritance bug which has since been fixed in mainline. It will
be sent for inclusion with the xfstests project should you decide to
merge this.
In order to support per-mount idmappings vfsmounts are marked with
user namespaces. The idmapping of the user namespace will be used to
map the ids of vfs objects when they are accessed through that mount.
By default all vfsmounts are marked with the initial user namespace.
The initial user namespace is used to indicate that a mount is not
idmapped. All operations behave as before and this is verified in the
testsuite.
Based on prior discussions we want to attach the whole user namespace
and not just a dedicated idmapping struct. This allows us to reuse all
the helpers that already exist for dealing with idmappings instead of
introducing a whole new range of helpers. In addition, if we decide in
the future that we are confident enough to enable unprivileged users
to setup idmapped mounts the permission checking can take into account
whether the caller is privileged in the user namespace the mount is
currently marked with.
The user namespace the mount will be marked with can be specified by
passing a file descriptor refering to the user namespace as an
argument to the new mount_setattr() syscall together with the new
MOUNT_ATTR_IDMAP flag. The system call follows the openat2() pattern
of extensibility.
The following conditions must be met in order to create an idmapped
mount:
- The caller must currently have the CAP_SYS_ADMIN capability in the
user namespace the underlying filesystem has been mounted in.
- The underlying filesystem must support idmapped mounts.
- The mount must not already be idmapped. This also implies that the
idmapping of a mount cannot be altered once it has been idmapped.
- The mount must be a detached/anonymous mount, i.e. it must have
been created by calling open_tree() with the OPEN_TREE_CLONE flag
and it must not already have been visible in the filesystem.
The last two points guarantee easier semantics for userspace and the
kernel and make the implementation significantly simpler.
By default vfsmounts are marked with the initial user namespace and no
behavioral or performance changes are observed.
The manpage with a detailed description can be found here:
1d7b902e28
In order to support idmapped mounts, filesystems need to be changed
and mark themselves with the FS_ALLOW_IDMAP flag in fs_flags. The
patches to convert individual filesystem are not very large or
complicated overall as can be seen from the included fat, ext4, and
xfs ports. Patches for other filesystems are actively worked on and
will be sent out separately. The xfstestsuite can be used to verify
that port has been done correctly.
The mount_setattr() syscall is motivated independent of the idmapped
mounts patches and it's been around since July 2019. One of the most
valuable features of the new mount api is the ability to perform
mounts based on file descriptors only.
Together with the lookup restrictions available in the openat2()
RESOLVE_* flag namespace which we added in v5.6 this is the first time
we are close to hardened and race-free (e.g. symlinks) mounting and
path resolution.
While userspace has started porting to the new mount api to mount
proper filesystems and create new bind-mounts it is currently not
possible to change mount options of an already existing bind mount in
the new mount api since the mount_setattr() syscall is missing.
With the addition of the mount_setattr() syscall we remove this last
restriction and userspace can now fully port to the new mount api,
covering every use-case the old mount api could. We also add the
crucial ability to recursively change mount options for a whole mount
tree, both removing and adding mount options at the same time. This
syscall has been requested multiple times by various people and
projects.
There is a simple tool available at
https://github.com/brauner/mount-idmapped
that allows to create idmapped mounts so people can play with this
patch series. I'll add support for the regular mount binary should you
decide to pull this in the following weeks:
Here's an example to a simple idmapped mount of another user's home
directory:
u1001@f2-vm:/$ sudo ./mount --idmap both:1000:1001:1 /home/ubuntu/ /mnt
u1001@f2-vm:/$ ls -al /home/ubuntu/
total 28
drwxr-xr-x 2 ubuntu ubuntu 4096 Oct 28 22:07 .
drwxr-xr-x 4 root root 4096 Oct 28 04:00 ..
-rw------- 1 ubuntu ubuntu 3154 Oct 28 22:12 .bash_history
-rw-r--r-- 1 ubuntu ubuntu 220 Feb 25 2020 .bash_logout
-rw-r--r-- 1 ubuntu ubuntu 3771 Feb 25 2020 .bashrc
-rw-r--r-- 1 ubuntu ubuntu 807 Feb 25 2020 .profile
-rw-r--r-- 1 ubuntu ubuntu 0 Oct 16 16:11 .sudo_as_admin_successful
-rw------- 1 ubuntu ubuntu 1144 Oct 28 00:43 .viminfo
u1001@f2-vm:/$ ls -al /mnt/
total 28
drwxr-xr-x 2 u1001 u1001 4096 Oct 28 22:07 .
drwxr-xr-x 29 root root 4096 Oct 28 22:01 ..
-rw------- 1 u1001 u1001 3154 Oct 28 22:12 .bash_history
-rw-r--r-- 1 u1001 u1001 220 Feb 25 2020 .bash_logout
-rw-r--r-- 1 u1001 u1001 3771 Feb 25 2020 .bashrc
-rw-r--r-- 1 u1001 u1001 807 Feb 25 2020 .profile
-rw-r--r-- 1 u1001 u1001 0 Oct 16 16:11 .sudo_as_admin_successful
-rw------- 1 u1001 u1001 1144 Oct 28 00:43 .viminfo
u1001@f2-vm:/$ touch /mnt/my-file
u1001@f2-vm:/$ setfacl -m u:1001:rwx /mnt/my-file
u1001@f2-vm:/$ sudo setcap -n 1001 cap_net_raw+ep /mnt/my-file
u1001@f2-vm:/$ ls -al /mnt/my-file
-rw-rwxr--+ 1 u1001 u1001 0 Oct 28 22:14 /mnt/my-file
u1001@f2-vm:/$ ls -al /home/ubuntu/my-file
-rw-rwxr--+ 1 ubuntu ubuntu 0 Oct 28 22:14 /home/ubuntu/my-file
u1001@f2-vm:/$ getfacl /mnt/my-file
getfacl: Removing leading '/' from absolute path names
# file: mnt/my-file
# owner: u1001
# group: u1001
user::rw-
user:u1001:rwx
group::rw-
mask::rwx
other::r--
u1001@f2-vm:/$ getfacl /home/ubuntu/my-file
getfacl: Removing leading '/' from absolute path names
# file: home/ubuntu/my-file
# owner: ubuntu
# group: ubuntu
user::rw-
user:ubuntu:rwx
group::rw-
mask::rwx
other::r--"
* tag 'idmapped-mounts-v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux: (41 commits)
xfs: remove the possibly unused mp variable in xfs_file_compat_ioctl
xfs: support idmapped mounts
ext4: support idmapped mounts
fat: handle idmapped mounts
tests: add mount_setattr() selftests
fs: introduce MOUNT_ATTR_IDMAP
fs: add mount_setattr()
fs: add attr_flags_to_mnt_flags helper
fs: split out functions to hold writers
namespace: only take read lock in do_reconfigure_mnt()
mount: make {lock,unlock}_mount_hash() static
namespace: take lock_mount_hash() directly when changing flags
nfs: do not export idmapped mounts
overlayfs: do not mount on top of idmapped mounts
ecryptfs: do not mount on top of idmapped mounts
ima: handle idmapped mounts
apparmor: handle idmapped mounts
fs: make helpers idmap mount aware
exec: handle idmapped mounts
would_dump: handle idmapped mounts
...
1886 lines
45 KiB
C
1886 lines
45 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
|
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* All Rights Reserved.
|
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*/
|
|
#include "xfs.h"
|
|
#include "xfs_fs.h"
|
|
#include "xfs_shared.h"
|
|
#include "xfs_format.h"
|
|
#include "xfs_log_format.h"
|
|
#include "xfs_trans_resv.h"
|
|
#include "xfs_bit.h"
|
|
#include "xfs_sb.h"
|
|
#include "xfs_mount.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_iwalk.h"
|
|
#include "xfs_quota.h"
|
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#include "xfs_bmap.h"
|
|
#include "xfs_bmap_util.h"
|
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#include "xfs_trans.h"
|
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#include "xfs_trans_space.h"
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#include "xfs_qm.h"
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|
#include "xfs_trace.h"
|
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#include "xfs_icache.h"
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#include "xfs_error.h"
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|
|
|
/*
|
|
* The global quota manager. There is only one of these for the entire
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|
* system, _not_ one per file system. XQM keeps track of the overall
|
|
* quota functionality, including maintaining the freelist and hash
|
|
* tables of dquots.
|
|
*/
|
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STATIC int xfs_qm_init_quotainos(struct xfs_mount *mp);
|
|
STATIC int xfs_qm_init_quotainfo(struct xfs_mount *mp);
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|
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STATIC void xfs_qm_destroy_quotainos(struct xfs_quotainfo *qi);
|
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STATIC void xfs_qm_dqfree_one(struct xfs_dquot *dqp);
|
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/*
|
|
* We use the batch lookup interface to iterate over the dquots as it
|
|
* currently is the only interface into the radix tree code that allows
|
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* fuzzy lookups instead of exact matches. Holding the lock over multiple
|
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* operations is fine as all callers are used either during mount/umount
|
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* or quotaoff.
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*/
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#define XFS_DQ_LOOKUP_BATCH 32
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|
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STATIC int
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xfs_qm_dquot_walk(
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struct xfs_mount *mp,
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xfs_dqtype_t type,
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int (*execute)(struct xfs_dquot *dqp, void *data),
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void *data)
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{
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struct xfs_quotainfo *qi = mp->m_quotainfo;
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struct radix_tree_root *tree = xfs_dquot_tree(qi, type);
|
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uint32_t next_index;
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int last_error = 0;
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int skipped;
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int nr_found;
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restart:
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skipped = 0;
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next_index = 0;
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nr_found = 0;
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while (1) {
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struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
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int error = 0;
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int i;
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mutex_lock(&qi->qi_tree_lock);
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nr_found = radix_tree_gang_lookup(tree, (void **)batch,
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next_index, XFS_DQ_LOOKUP_BATCH);
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if (!nr_found) {
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mutex_unlock(&qi->qi_tree_lock);
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break;
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}
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for (i = 0; i < nr_found; i++) {
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struct xfs_dquot *dqp = batch[i];
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next_index = dqp->q_id + 1;
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error = execute(batch[i], data);
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if (error == -EAGAIN) {
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skipped++;
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continue;
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}
|
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if (error && last_error != -EFSCORRUPTED)
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last_error = error;
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}
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mutex_unlock(&qi->qi_tree_lock);
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|
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/* bail out if the filesystem is corrupted. */
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if (last_error == -EFSCORRUPTED) {
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skipped = 0;
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break;
|
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}
|
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/* we're done if id overflows back to zero */
|
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if (!next_index)
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break;
|
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}
|
|
|
|
if (skipped) {
|
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delay(1);
|
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goto restart;
|
|
}
|
|
|
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return last_error;
|
|
}
|
|
|
|
|
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/*
|
|
* Purge a dquot from all tracking data structures and free it.
|
|
*/
|
|
STATIC int
|
|
xfs_qm_dqpurge(
|
|
struct xfs_dquot *dqp,
|
|
void *data)
|
|
{
|
|
struct xfs_mount *mp = dqp->q_mount;
|
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struct xfs_quotainfo *qi = mp->m_quotainfo;
|
|
int error = -EAGAIN;
|
|
|
|
xfs_dqlock(dqp);
|
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if ((dqp->q_flags & XFS_DQFLAG_FREEING) || dqp->q_nrefs != 0)
|
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goto out_unlock;
|
|
|
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dqp->q_flags |= XFS_DQFLAG_FREEING;
|
|
|
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xfs_dqflock(dqp);
|
|
|
|
/*
|
|
* If we are turning this type of quotas off, we don't care
|
|
* about the dirty metadata sitting in this dquot. OTOH, if
|
|
* we're unmounting, we do care, so we flush it and wait.
|
|
*/
|
|
if (XFS_DQ_IS_DIRTY(dqp)) {
|
|
struct xfs_buf *bp = NULL;
|
|
|
|
/*
|
|
* We don't care about getting disk errors here. We need
|
|
* to purge this dquot anyway, so we go ahead regardless.
|
|
*/
|
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error = xfs_qm_dqflush(dqp, &bp);
|
|
if (!error) {
|
|
error = xfs_bwrite(bp);
|
|
xfs_buf_relse(bp);
|
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} else if (error == -EAGAIN) {
|
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dqp->q_flags &= ~XFS_DQFLAG_FREEING;
|
|
goto out_unlock;
|
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}
|
|
xfs_dqflock(dqp);
|
|
}
|
|
|
|
ASSERT(atomic_read(&dqp->q_pincount) == 0);
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
|
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!test_bit(XFS_LI_IN_AIL, &dqp->q_logitem.qli_item.li_flags));
|
|
|
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xfs_dqfunlock(dqp);
|
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xfs_dqunlock(dqp);
|
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radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
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qi->qi_dquots--;
|
|
|
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/*
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* We move dquots to the freelist as soon as their reference count
|
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* hits zero, so it really should be on the freelist here.
|
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*/
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ASSERT(!list_empty(&dqp->q_lru));
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list_lru_del(&qi->qi_lru, &dqp->q_lru);
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XFS_STATS_DEC(mp, xs_qm_dquot_unused);
|
|
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xfs_qm_dqdestroy(dqp);
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return 0;
|
|
|
|
out_unlock:
|
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xfs_dqunlock(dqp);
|
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return error;
|
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}
|
|
|
|
/*
|
|
* Purge the dquot cache.
|
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*/
|
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void
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xfs_qm_dqpurge_all(
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struct xfs_mount *mp,
|
|
uint flags)
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{
|
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if (flags & XFS_QMOPT_UQUOTA)
|
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xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_dqpurge, NULL);
|
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if (flags & XFS_QMOPT_GQUOTA)
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xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_dqpurge, NULL);
|
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if (flags & XFS_QMOPT_PQUOTA)
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xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_dqpurge, NULL);
|
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}
|
|
|
|
/*
|
|
* Just destroy the quotainfo structure.
|
|
*/
|
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void
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|
xfs_qm_unmount(
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|
struct xfs_mount *mp)
|
|
{
|
|
if (mp->m_quotainfo) {
|
|
xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
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xfs_qm_destroy_quotainfo(mp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Called from the vfsops layer.
|
|
*/
|
|
void
|
|
xfs_qm_unmount_quotas(
|
|
xfs_mount_t *mp)
|
|
{
|
|
/*
|
|
* Release the dquots that root inode, et al might be holding,
|
|
* before we flush quotas and blow away the quotainfo structure.
|
|
*/
|
|
ASSERT(mp->m_rootip);
|
|
xfs_qm_dqdetach(mp->m_rootip);
|
|
if (mp->m_rbmip)
|
|
xfs_qm_dqdetach(mp->m_rbmip);
|
|
if (mp->m_rsumip)
|
|
xfs_qm_dqdetach(mp->m_rsumip);
|
|
|
|
/*
|
|
* Release the quota inodes.
|
|
*/
|
|
if (mp->m_quotainfo) {
|
|
if (mp->m_quotainfo->qi_uquotaip) {
|
|
xfs_irele(mp->m_quotainfo->qi_uquotaip);
|
|
mp->m_quotainfo->qi_uquotaip = NULL;
|
|
}
|
|
if (mp->m_quotainfo->qi_gquotaip) {
|
|
xfs_irele(mp->m_quotainfo->qi_gquotaip);
|
|
mp->m_quotainfo->qi_gquotaip = NULL;
|
|
}
|
|
if (mp->m_quotainfo->qi_pquotaip) {
|
|
xfs_irele(mp->m_quotainfo->qi_pquotaip);
|
|
mp->m_quotainfo->qi_pquotaip = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
STATIC int
|
|
xfs_qm_dqattach_one(
|
|
struct xfs_inode *ip,
|
|
xfs_dqtype_t type,
|
|
bool doalloc,
|
|
struct xfs_dquot **IO_idqpp)
|
|
{
|
|
struct xfs_dquot *dqp;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
error = 0;
|
|
|
|
/*
|
|
* See if we already have it in the inode itself. IO_idqpp is &i_udquot
|
|
* or &i_gdquot. This made the code look weird, but made the logic a lot
|
|
* simpler.
|
|
*/
|
|
dqp = *IO_idqpp;
|
|
if (dqp) {
|
|
trace_xfs_dqattach_found(dqp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Find the dquot from somewhere. This bumps the reference count of
|
|
* dquot and returns it locked. This can return ENOENT if dquot didn't
|
|
* exist on disk and we didn't ask it to allocate; ESRCH if quotas got
|
|
* turned off suddenly.
|
|
*/
|
|
error = xfs_qm_dqget_inode(ip, type, doalloc, &dqp);
|
|
if (error)
|
|
return error;
|
|
|
|
trace_xfs_dqattach_get(dqp);
|
|
|
|
/*
|
|
* dqget may have dropped and re-acquired the ilock, but it guarantees
|
|
* that the dquot returned is the one that should go in the inode.
|
|
*/
|
|
*IO_idqpp = dqp;
|
|
xfs_dqunlock(dqp);
|
|
return 0;
|
|
}
|
|
|
|
static bool
|
|
xfs_qm_need_dqattach(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
|
|
if (!XFS_IS_QUOTA_RUNNING(mp))
|
|
return false;
|
|
if (!XFS_IS_QUOTA_ON(mp))
|
|
return false;
|
|
if (!XFS_NOT_DQATTACHED(mp, ip))
|
|
return false;
|
|
if (xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
|
|
* into account.
|
|
* If @doalloc is true, the dquot(s) will be allocated if needed.
|
|
* Inode may get unlocked and relocked in here, and the caller must deal with
|
|
* the consequences.
|
|
*/
|
|
int
|
|
xfs_qm_dqattach_locked(
|
|
xfs_inode_t *ip,
|
|
bool doalloc)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
int error = 0;
|
|
|
|
if (!xfs_qm_need_dqattach(ip))
|
|
return 0;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
if (XFS_IS_UQUOTA_ON(mp) && !ip->i_udquot) {
|
|
error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_USER,
|
|
doalloc, &ip->i_udquot);
|
|
if (error)
|
|
goto done;
|
|
ASSERT(ip->i_udquot);
|
|
}
|
|
|
|
if (XFS_IS_GQUOTA_ON(mp) && !ip->i_gdquot) {
|
|
error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_GROUP,
|
|
doalloc, &ip->i_gdquot);
|
|
if (error)
|
|
goto done;
|
|
ASSERT(ip->i_gdquot);
|
|
}
|
|
|
|
if (XFS_IS_PQUOTA_ON(mp) && !ip->i_pdquot) {
|
|
error = xfs_qm_dqattach_one(ip, XFS_DQTYPE_PROJ,
|
|
doalloc, &ip->i_pdquot);
|
|
if (error)
|
|
goto done;
|
|
ASSERT(ip->i_pdquot);
|
|
}
|
|
|
|
done:
|
|
/*
|
|
* Don't worry about the dquots that we may have attached before any
|
|
* error - they'll get detached later if it has not already been done.
|
|
*/
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_qm_dqattach(
|
|
struct xfs_inode *ip)
|
|
{
|
|
int error;
|
|
|
|
if (!xfs_qm_need_dqattach(ip))
|
|
return 0;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
error = xfs_qm_dqattach_locked(ip, false);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Release dquots (and their references) if any.
|
|
* The inode should be locked EXCL except when this's called by
|
|
* xfs_ireclaim.
|
|
*/
|
|
void
|
|
xfs_qm_dqdetach(
|
|
xfs_inode_t *ip)
|
|
{
|
|
if (!(ip->i_udquot || ip->i_gdquot || ip->i_pdquot))
|
|
return;
|
|
|
|
trace_xfs_dquot_dqdetach(ip);
|
|
|
|
ASSERT(!xfs_is_quota_inode(&ip->i_mount->m_sb, ip->i_ino));
|
|
if (ip->i_udquot) {
|
|
xfs_qm_dqrele(ip->i_udquot);
|
|
ip->i_udquot = NULL;
|
|
}
|
|
if (ip->i_gdquot) {
|
|
xfs_qm_dqrele(ip->i_gdquot);
|
|
ip->i_gdquot = NULL;
|
|
}
|
|
if (ip->i_pdquot) {
|
|
xfs_qm_dqrele(ip->i_pdquot);
|
|
ip->i_pdquot = NULL;
|
|
}
|
|
}
|
|
|
|
struct xfs_qm_isolate {
|
|
struct list_head buffers;
|
|
struct list_head dispose;
|
|
};
|
|
|
|
static enum lru_status
|
|
xfs_qm_dquot_isolate(
|
|
struct list_head *item,
|
|
struct list_lru_one *lru,
|
|
spinlock_t *lru_lock,
|
|
void *arg)
|
|
__releases(lru_lock) __acquires(lru_lock)
|
|
{
|
|
struct xfs_dquot *dqp = container_of(item,
|
|
struct xfs_dquot, q_lru);
|
|
struct xfs_qm_isolate *isol = arg;
|
|
|
|
if (!xfs_dqlock_nowait(dqp))
|
|
goto out_miss_busy;
|
|
|
|
/*
|
|
* This dquot has acquired a reference in the meantime remove it from
|
|
* the freelist and try again.
|
|
*/
|
|
if (dqp->q_nrefs) {
|
|
xfs_dqunlock(dqp);
|
|
XFS_STATS_INC(dqp->q_mount, xs_qm_dqwants);
|
|
|
|
trace_xfs_dqreclaim_want(dqp);
|
|
list_lru_isolate(lru, &dqp->q_lru);
|
|
XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
|
|
return LRU_REMOVED;
|
|
}
|
|
|
|
/*
|
|
* If the dquot is dirty, flush it. If it's already being flushed, just
|
|
* skip it so there is time for the IO to complete before we try to
|
|
* reclaim it again on the next LRU pass.
|
|
*/
|
|
if (!xfs_dqflock_nowait(dqp)) {
|
|
xfs_dqunlock(dqp);
|
|
goto out_miss_busy;
|
|
}
|
|
|
|
if (XFS_DQ_IS_DIRTY(dqp)) {
|
|
struct xfs_buf *bp = NULL;
|
|
int error;
|
|
|
|
trace_xfs_dqreclaim_dirty(dqp);
|
|
|
|
/* we have to drop the LRU lock to flush the dquot */
|
|
spin_unlock(lru_lock);
|
|
|
|
error = xfs_qm_dqflush(dqp, &bp);
|
|
if (error)
|
|
goto out_unlock_dirty;
|
|
|
|
xfs_buf_delwri_queue(bp, &isol->buffers);
|
|
xfs_buf_relse(bp);
|
|
goto out_unlock_dirty;
|
|
}
|
|
xfs_dqfunlock(dqp);
|
|
|
|
/*
|
|
* Prevent lookups now that we are past the point of no return.
|
|
*/
|
|
dqp->q_flags |= XFS_DQFLAG_FREEING;
|
|
xfs_dqunlock(dqp);
|
|
|
|
ASSERT(dqp->q_nrefs == 0);
|
|
list_lru_isolate_move(lru, &dqp->q_lru, &isol->dispose);
|
|
XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot_unused);
|
|
trace_xfs_dqreclaim_done(dqp);
|
|
XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaims);
|
|
return LRU_REMOVED;
|
|
|
|
out_miss_busy:
|
|
trace_xfs_dqreclaim_busy(dqp);
|
|
XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
|
|
return LRU_SKIP;
|
|
|
|
out_unlock_dirty:
|
|
trace_xfs_dqreclaim_busy(dqp);
|
|
XFS_STATS_INC(dqp->q_mount, xs_qm_dqreclaim_misses);
|
|
xfs_dqunlock(dqp);
|
|
spin_lock(lru_lock);
|
|
return LRU_RETRY;
|
|
}
|
|
|
|
static unsigned long
|
|
xfs_qm_shrink_scan(
|
|
struct shrinker *shrink,
|
|
struct shrink_control *sc)
|
|
{
|
|
struct xfs_quotainfo *qi = container_of(shrink,
|
|
struct xfs_quotainfo, qi_shrinker);
|
|
struct xfs_qm_isolate isol;
|
|
unsigned long freed;
|
|
int error;
|
|
|
|
if ((sc->gfp_mask & (__GFP_FS|__GFP_DIRECT_RECLAIM)) != (__GFP_FS|__GFP_DIRECT_RECLAIM))
|
|
return 0;
|
|
|
|
INIT_LIST_HEAD(&isol.buffers);
|
|
INIT_LIST_HEAD(&isol.dispose);
|
|
|
|
freed = list_lru_shrink_walk(&qi->qi_lru, sc,
|
|
xfs_qm_dquot_isolate, &isol);
|
|
|
|
error = xfs_buf_delwri_submit(&isol.buffers);
|
|
if (error)
|
|
xfs_warn(NULL, "%s: dquot reclaim failed", __func__);
|
|
|
|
while (!list_empty(&isol.dispose)) {
|
|
struct xfs_dquot *dqp;
|
|
|
|
dqp = list_first_entry(&isol.dispose, struct xfs_dquot, q_lru);
|
|
list_del_init(&dqp->q_lru);
|
|
xfs_qm_dqfree_one(dqp);
|
|
}
|
|
|
|
return freed;
|
|
}
|
|
|
|
static unsigned long
|
|
xfs_qm_shrink_count(
|
|
struct shrinker *shrink,
|
|
struct shrink_control *sc)
|
|
{
|
|
struct xfs_quotainfo *qi = container_of(shrink,
|
|
struct xfs_quotainfo, qi_shrinker);
|
|
|
|
return list_lru_shrink_count(&qi->qi_lru, sc);
|
|
}
|
|
|
|
STATIC void
|
|
xfs_qm_set_defquota(
|
|
struct xfs_mount *mp,
|
|
xfs_dqtype_t type,
|
|
struct xfs_quotainfo *qinf)
|
|
{
|
|
struct xfs_dquot *dqp;
|
|
struct xfs_def_quota *defq;
|
|
int error;
|
|
|
|
error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
|
|
if (error)
|
|
return;
|
|
|
|
defq = xfs_get_defquota(qinf, xfs_dquot_type(dqp));
|
|
|
|
/*
|
|
* Timers and warnings have been already set, let's just set the
|
|
* default limits for this quota type
|
|
*/
|
|
defq->blk.hard = dqp->q_blk.hardlimit;
|
|
defq->blk.soft = dqp->q_blk.softlimit;
|
|
defq->ino.hard = dqp->q_ino.hardlimit;
|
|
defq->ino.soft = dqp->q_ino.softlimit;
|
|
defq->rtb.hard = dqp->q_rtb.hardlimit;
|
|
defq->rtb.soft = dqp->q_rtb.softlimit;
|
|
xfs_qm_dqdestroy(dqp);
|
|
}
|
|
|
|
/* Initialize quota time limits from the root dquot. */
|
|
static void
|
|
xfs_qm_init_timelimits(
|
|
struct xfs_mount *mp,
|
|
xfs_dqtype_t type)
|
|
{
|
|
struct xfs_quotainfo *qinf = mp->m_quotainfo;
|
|
struct xfs_def_quota *defq;
|
|
struct xfs_dquot *dqp;
|
|
int error;
|
|
|
|
defq = xfs_get_defquota(qinf, type);
|
|
|
|
defq->blk.time = XFS_QM_BTIMELIMIT;
|
|
defq->ino.time = XFS_QM_ITIMELIMIT;
|
|
defq->rtb.time = XFS_QM_RTBTIMELIMIT;
|
|
defq->blk.warn = XFS_QM_BWARNLIMIT;
|
|
defq->ino.warn = XFS_QM_IWARNLIMIT;
|
|
defq->rtb.warn = XFS_QM_RTBWARNLIMIT;
|
|
|
|
/*
|
|
* We try to get the limits from the superuser's limits fields.
|
|
* This is quite hacky, but it is standard quota practice.
|
|
*
|
|
* Since we may not have done a quotacheck by this point, just read
|
|
* the dquot without attaching it to any hashtables or lists.
|
|
*/
|
|
error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
|
|
if (error)
|
|
return;
|
|
|
|
/*
|
|
* The warnings and timers set the grace period given to
|
|
* a user or group before he or she can not perform any
|
|
* more writing. If it is zero, a default is used.
|
|
*/
|
|
if (dqp->q_blk.timer)
|
|
defq->blk.time = dqp->q_blk.timer;
|
|
if (dqp->q_ino.timer)
|
|
defq->ino.time = dqp->q_ino.timer;
|
|
if (dqp->q_rtb.timer)
|
|
defq->rtb.time = dqp->q_rtb.timer;
|
|
if (dqp->q_blk.warnings)
|
|
defq->blk.warn = dqp->q_blk.warnings;
|
|
if (dqp->q_ino.warnings)
|
|
defq->ino.warn = dqp->q_ino.warnings;
|
|
if (dqp->q_rtb.warnings)
|
|
defq->rtb.warn = dqp->q_rtb.warnings;
|
|
|
|
xfs_qm_dqdestroy(dqp);
|
|
}
|
|
|
|
/*
|
|
* This initializes all the quota information that's kept in the
|
|
* mount structure
|
|
*/
|
|
STATIC int
|
|
xfs_qm_init_quotainfo(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_quotainfo *qinf;
|
|
int error;
|
|
|
|
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
|
|
|
|
qinf = mp->m_quotainfo = kmem_zalloc(sizeof(struct xfs_quotainfo), 0);
|
|
|
|
error = list_lru_init(&qinf->qi_lru);
|
|
if (error)
|
|
goto out_free_qinf;
|
|
|
|
/*
|
|
* See if quotainodes are setup, and if not, allocate them,
|
|
* and change the superblock accordingly.
|
|
*/
|
|
error = xfs_qm_init_quotainos(mp);
|
|
if (error)
|
|
goto out_free_lru;
|
|
|
|
INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
|
|
INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
|
|
INIT_RADIX_TREE(&qinf->qi_pquota_tree, GFP_NOFS);
|
|
mutex_init(&qinf->qi_tree_lock);
|
|
|
|
/* mutex used to serialize quotaoffs */
|
|
mutex_init(&qinf->qi_quotaofflock);
|
|
|
|
/* Precalc some constants */
|
|
qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
|
|
qinf->qi_dqperchunk = xfs_calc_dquots_per_chunk(qinf->qi_dqchunklen);
|
|
if (xfs_sb_version_hasbigtime(&mp->m_sb)) {
|
|
qinf->qi_expiry_min =
|
|
xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MIN);
|
|
qinf->qi_expiry_max =
|
|
xfs_dq_bigtime_to_unix(XFS_DQ_BIGTIME_EXPIRY_MAX);
|
|
} else {
|
|
qinf->qi_expiry_min = XFS_DQ_LEGACY_EXPIRY_MIN;
|
|
qinf->qi_expiry_max = XFS_DQ_LEGACY_EXPIRY_MAX;
|
|
}
|
|
trace_xfs_quota_expiry_range(mp, qinf->qi_expiry_min,
|
|
qinf->qi_expiry_max);
|
|
|
|
mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
|
|
|
|
xfs_qm_init_timelimits(mp, XFS_DQTYPE_USER);
|
|
xfs_qm_init_timelimits(mp, XFS_DQTYPE_GROUP);
|
|
xfs_qm_init_timelimits(mp, XFS_DQTYPE_PROJ);
|
|
|
|
if (XFS_IS_UQUOTA_RUNNING(mp))
|
|
xfs_qm_set_defquota(mp, XFS_DQTYPE_USER, qinf);
|
|
if (XFS_IS_GQUOTA_RUNNING(mp))
|
|
xfs_qm_set_defquota(mp, XFS_DQTYPE_GROUP, qinf);
|
|
if (XFS_IS_PQUOTA_RUNNING(mp))
|
|
xfs_qm_set_defquota(mp, XFS_DQTYPE_PROJ, qinf);
|
|
|
|
qinf->qi_shrinker.count_objects = xfs_qm_shrink_count;
|
|
qinf->qi_shrinker.scan_objects = xfs_qm_shrink_scan;
|
|
qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
|
|
qinf->qi_shrinker.flags = SHRINKER_NUMA_AWARE;
|
|
|
|
error = register_shrinker(&qinf->qi_shrinker);
|
|
if (error)
|
|
goto out_free_inos;
|
|
|
|
return 0;
|
|
|
|
out_free_inos:
|
|
mutex_destroy(&qinf->qi_quotaofflock);
|
|
mutex_destroy(&qinf->qi_tree_lock);
|
|
xfs_qm_destroy_quotainos(qinf);
|
|
out_free_lru:
|
|
list_lru_destroy(&qinf->qi_lru);
|
|
out_free_qinf:
|
|
kmem_free(qinf);
|
|
mp->m_quotainfo = NULL;
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Gets called when unmounting a filesystem or when all quotas get
|
|
* turned off.
|
|
* This purges the quota inodes, destroys locks and frees itself.
|
|
*/
|
|
void
|
|
xfs_qm_destroy_quotainfo(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_quotainfo *qi;
|
|
|
|
qi = mp->m_quotainfo;
|
|
ASSERT(qi != NULL);
|
|
|
|
unregister_shrinker(&qi->qi_shrinker);
|
|
list_lru_destroy(&qi->qi_lru);
|
|
xfs_qm_destroy_quotainos(qi);
|
|
mutex_destroy(&qi->qi_tree_lock);
|
|
mutex_destroy(&qi->qi_quotaofflock);
|
|
kmem_free(qi);
|
|
mp->m_quotainfo = NULL;
|
|
}
|
|
|
|
/*
|
|
* Create an inode and return with a reference already taken, but unlocked
|
|
* This is how we create quota inodes
|
|
*/
|
|
STATIC int
|
|
xfs_qm_qino_alloc(
|
|
struct xfs_mount *mp,
|
|
struct xfs_inode **ipp,
|
|
unsigned int flags)
|
|
{
|
|
struct xfs_trans *tp;
|
|
int error;
|
|
bool need_alloc = true;
|
|
|
|
*ipp = NULL;
|
|
/*
|
|
* With superblock that doesn't have separate pquotino, we
|
|
* share an inode between gquota and pquota. If the on-disk
|
|
* superblock has GQUOTA and the filesystem is now mounted
|
|
* with PQUOTA, just use sb_gquotino for sb_pquotino and
|
|
* vice-versa.
|
|
*/
|
|
if (!xfs_sb_version_has_pquotino(&mp->m_sb) &&
|
|
(flags & (XFS_QMOPT_PQUOTA|XFS_QMOPT_GQUOTA))) {
|
|
xfs_ino_t ino = NULLFSINO;
|
|
|
|
if ((flags & XFS_QMOPT_PQUOTA) &&
|
|
(mp->m_sb.sb_gquotino != NULLFSINO)) {
|
|
ino = mp->m_sb.sb_gquotino;
|
|
if (XFS_IS_CORRUPT(mp,
|
|
mp->m_sb.sb_pquotino != NULLFSINO))
|
|
return -EFSCORRUPTED;
|
|
} else if ((flags & XFS_QMOPT_GQUOTA) &&
|
|
(mp->m_sb.sb_pquotino != NULLFSINO)) {
|
|
ino = mp->m_sb.sb_pquotino;
|
|
if (XFS_IS_CORRUPT(mp,
|
|
mp->m_sb.sb_gquotino != NULLFSINO))
|
|
return -EFSCORRUPTED;
|
|
}
|
|
if (ino != NULLFSINO) {
|
|
error = xfs_iget(mp, NULL, ino, 0, 0, ipp);
|
|
if (error)
|
|
return error;
|
|
mp->m_sb.sb_gquotino = NULLFSINO;
|
|
mp->m_sb.sb_pquotino = NULLFSINO;
|
|
need_alloc = false;
|
|
}
|
|
}
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_create,
|
|
need_alloc ? XFS_QM_QINOCREATE_SPACE_RES(mp) : 0,
|
|
0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
if (need_alloc) {
|
|
error = xfs_dir_ialloc(&init_user_ns, &tp, NULL, S_IFREG, 1, 0,
|
|
0, ipp);
|
|
if (error) {
|
|
xfs_trans_cancel(tp);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make the changes in the superblock, and log those too.
|
|
* sbfields arg may contain fields other than *QUOTINO;
|
|
* VERSIONNUM for example.
|
|
*/
|
|
spin_lock(&mp->m_sb_lock);
|
|
if (flags & XFS_QMOPT_SBVERSION) {
|
|
ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
|
|
|
|
xfs_sb_version_addquota(&mp->m_sb);
|
|
mp->m_sb.sb_uquotino = NULLFSINO;
|
|
mp->m_sb.sb_gquotino = NULLFSINO;
|
|
mp->m_sb.sb_pquotino = NULLFSINO;
|
|
|
|
/* qflags will get updated fully _after_ quotacheck */
|
|
mp->m_sb.sb_qflags = mp->m_qflags & XFS_ALL_QUOTA_ACCT;
|
|
}
|
|
if (flags & XFS_QMOPT_UQUOTA)
|
|
mp->m_sb.sb_uquotino = (*ipp)->i_ino;
|
|
else if (flags & XFS_QMOPT_GQUOTA)
|
|
mp->m_sb.sb_gquotino = (*ipp)->i_ino;
|
|
else
|
|
mp->m_sb.sb_pquotino = (*ipp)->i_ino;
|
|
spin_unlock(&mp->m_sb_lock);
|
|
xfs_log_sb(tp);
|
|
|
|
error = xfs_trans_commit(tp);
|
|
if (error) {
|
|
ASSERT(XFS_FORCED_SHUTDOWN(mp));
|
|
xfs_alert(mp, "%s failed (error %d)!", __func__, error);
|
|
}
|
|
if (need_alloc)
|
|
xfs_finish_inode_setup(*ipp);
|
|
return error;
|
|
}
|
|
|
|
|
|
STATIC void
|
|
xfs_qm_reset_dqcounts(
|
|
struct xfs_mount *mp,
|
|
struct xfs_buf *bp,
|
|
xfs_dqid_t id,
|
|
xfs_dqtype_t type)
|
|
{
|
|
struct xfs_dqblk *dqb;
|
|
int j;
|
|
|
|
trace_xfs_reset_dqcounts(bp, _RET_IP_);
|
|
|
|
/*
|
|
* Reset all counters and timers. They'll be
|
|
* started afresh by xfs_qm_quotacheck.
|
|
*/
|
|
#ifdef DEBUG
|
|
j = (int)XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB) /
|
|
sizeof(xfs_dqblk_t);
|
|
ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
|
|
#endif
|
|
dqb = bp->b_addr;
|
|
for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
|
|
struct xfs_disk_dquot *ddq;
|
|
|
|
ddq = (struct xfs_disk_dquot *)&dqb[j];
|
|
|
|
/*
|
|
* Do a sanity check, and if needed, repair the dqblk. Don't
|
|
* output any warnings because it's perfectly possible to
|
|
* find uninitialised dquot blks. See comment in
|
|
* xfs_dquot_verify.
|
|
*/
|
|
if (xfs_dqblk_verify(mp, &dqb[j], id + j) ||
|
|
(dqb[j].dd_diskdq.d_type & XFS_DQTYPE_REC_MASK) != type)
|
|
xfs_dqblk_repair(mp, &dqb[j], id + j, type);
|
|
|
|
/*
|
|
* Reset type in case we are reusing group quota file for
|
|
* project quotas or vice versa
|
|
*/
|
|
ddq->d_type = type;
|
|
ddq->d_bcount = 0;
|
|
ddq->d_icount = 0;
|
|
ddq->d_rtbcount = 0;
|
|
|
|
/*
|
|
* dquot id 0 stores the default grace period and the maximum
|
|
* warning limit that were set by the administrator, so we
|
|
* should not reset them.
|
|
*/
|
|
if (ddq->d_id != 0) {
|
|
ddq->d_btimer = 0;
|
|
ddq->d_itimer = 0;
|
|
ddq->d_rtbtimer = 0;
|
|
ddq->d_bwarns = 0;
|
|
ddq->d_iwarns = 0;
|
|
ddq->d_rtbwarns = 0;
|
|
if (xfs_sb_version_hasbigtime(&mp->m_sb))
|
|
ddq->d_type |= XFS_DQTYPE_BIGTIME;
|
|
}
|
|
|
|
if (xfs_sb_version_hascrc(&mp->m_sb)) {
|
|
xfs_update_cksum((char *)&dqb[j],
|
|
sizeof(struct xfs_dqblk),
|
|
XFS_DQUOT_CRC_OFF);
|
|
}
|
|
}
|
|
}
|
|
|
|
STATIC int
|
|
xfs_qm_reset_dqcounts_all(
|
|
struct xfs_mount *mp,
|
|
xfs_dqid_t firstid,
|
|
xfs_fsblock_t bno,
|
|
xfs_filblks_t blkcnt,
|
|
xfs_dqtype_t type,
|
|
struct list_head *buffer_list)
|
|
{
|
|
struct xfs_buf *bp;
|
|
int error = 0;
|
|
|
|
ASSERT(blkcnt > 0);
|
|
|
|
/*
|
|
* Blkcnt arg can be a very big number, and might even be
|
|
* larger than the log itself. So, we have to break it up into
|
|
* manageable-sized transactions.
|
|
* Note that we don't start a permanent transaction here; we might
|
|
* not be able to get a log reservation for the whole thing up front,
|
|
* and we don't really care to either, because we just discard
|
|
* everything if we were to crash in the middle of this loop.
|
|
*/
|
|
while (blkcnt--) {
|
|
error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(mp, bno),
|
|
mp->m_quotainfo->qi_dqchunklen, 0, &bp,
|
|
&xfs_dquot_buf_ops);
|
|
|
|
/*
|
|
* CRC and validation errors will return a EFSCORRUPTED here. If
|
|
* this occurs, re-read without CRC validation so that we can
|
|
* repair the damage via xfs_qm_reset_dqcounts(). This process
|
|
* will leave a trace in the log indicating corruption has
|
|
* been detected.
|
|
*/
|
|
if (error == -EFSCORRUPTED) {
|
|
error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(mp, bno),
|
|
mp->m_quotainfo->qi_dqchunklen, 0, &bp,
|
|
NULL);
|
|
}
|
|
|
|
if (error)
|
|
break;
|
|
|
|
/*
|
|
* A corrupt buffer might not have a verifier attached, so
|
|
* make sure we have the correct one attached before writeback
|
|
* occurs.
|
|
*/
|
|
bp->b_ops = &xfs_dquot_buf_ops;
|
|
xfs_qm_reset_dqcounts(mp, bp, firstid, type);
|
|
xfs_buf_delwri_queue(bp, buffer_list);
|
|
xfs_buf_relse(bp);
|
|
|
|
/* goto the next block. */
|
|
bno++;
|
|
firstid += mp->m_quotainfo->qi_dqperchunk;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Iterate over all allocated dquot blocks in this quota inode, zeroing all
|
|
* counters for every chunk of dquots that we find.
|
|
*/
|
|
STATIC int
|
|
xfs_qm_reset_dqcounts_buf(
|
|
struct xfs_mount *mp,
|
|
struct xfs_inode *qip,
|
|
xfs_dqtype_t type,
|
|
struct list_head *buffer_list)
|
|
{
|
|
struct xfs_bmbt_irec *map;
|
|
int i, nmaps; /* number of map entries */
|
|
int error; /* return value */
|
|
xfs_fileoff_t lblkno;
|
|
xfs_filblks_t maxlblkcnt;
|
|
xfs_dqid_t firstid;
|
|
xfs_fsblock_t rablkno;
|
|
xfs_filblks_t rablkcnt;
|
|
|
|
error = 0;
|
|
/*
|
|
* This looks racy, but we can't keep an inode lock across a
|
|
* trans_reserve. But, this gets called during quotacheck, and that
|
|
* happens only at mount time which is single threaded.
|
|
*/
|
|
if (qip->i_d.di_nblocks == 0)
|
|
return 0;
|
|
|
|
map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), 0);
|
|
|
|
lblkno = 0;
|
|
maxlblkcnt = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
|
|
do {
|
|
uint lock_mode;
|
|
|
|
nmaps = XFS_DQITER_MAP_SIZE;
|
|
/*
|
|
* We aren't changing the inode itself. Just changing
|
|
* some of its data. No new blocks are added here, and
|
|
* the inode is never added to the transaction.
|
|
*/
|
|
lock_mode = xfs_ilock_data_map_shared(qip);
|
|
error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
|
|
map, &nmaps, 0);
|
|
xfs_iunlock(qip, lock_mode);
|
|
if (error)
|
|
break;
|
|
|
|
ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
|
|
for (i = 0; i < nmaps; i++) {
|
|
ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
|
|
ASSERT(map[i].br_blockcount);
|
|
|
|
|
|
lblkno += map[i].br_blockcount;
|
|
|
|
if (map[i].br_startblock == HOLESTARTBLOCK)
|
|
continue;
|
|
|
|
firstid = (xfs_dqid_t) map[i].br_startoff *
|
|
mp->m_quotainfo->qi_dqperchunk;
|
|
/*
|
|
* Do a read-ahead on the next extent.
|
|
*/
|
|
if ((i+1 < nmaps) &&
|
|
(map[i+1].br_startblock != HOLESTARTBLOCK)) {
|
|
rablkcnt = map[i+1].br_blockcount;
|
|
rablkno = map[i+1].br_startblock;
|
|
while (rablkcnt--) {
|
|
xfs_buf_readahead(mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(mp, rablkno),
|
|
mp->m_quotainfo->qi_dqchunklen,
|
|
&xfs_dquot_buf_ops);
|
|
rablkno++;
|
|
}
|
|
}
|
|
/*
|
|
* Iterate thru all the blks in the extent and
|
|
* reset the counters of all the dquots inside them.
|
|
*/
|
|
error = xfs_qm_reset_dqcounts_all(mp, firstid,
|
|
map[i].br_startblock,
|
|
map[i].br_blockcount,
|
|
type, buffer_list);
|
|
if (error)
|
|
goto out;
|
|
}
|
|
} while (nmaps > 0);
|
|
|
|
out:
|
|
kmem_free(map);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Called by dqusage_adjust in doing a quotacheck.
|
|
*
|
|
* Given the inode, and a dquot id this updates both the incore dqout as well
|
|
* as the buffer copy. This is so that once the quotacheck is done, we can
|
|
* just log all the buffers, as opposed to logging numerous updates to
|
|
* individual dquots.
|
|
*/
|
|
STATIC int
|
|
xfs_qm_quotacheck_dqadjust(
|
|
struct xfs_inode *ip,
|
|
xfs_dqtype_t type,
|
|
xfs_qcnt_t nblks,
|
|
xfs_qcnt_t rtblks)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_dquot *dqp;
|
|
xfs_dqid_t id;
|
|
int error;
|
|
|
|
id = xfs_qm_id_for_quotatype(ip, type);
|
|
error = xfs_qm_dqget(mp, id, type, true, &dqp);
|
|
if (error) {
|
|
/*
|
|
* Shouldn't be able to turn off quotas here.
|
|
*/
|
|
ASSERT(error != -ESRCH);
|
|
ASSERT(error != -ENOENT);
|
|
return error;
|
|
}
|
|
|
|
trace_xfs_dqadjust(dqp);
|
|
|
|
/*
|
|
* Adjust the inode count and the block count to reflect this inode's
|
|
* resource usage.
|
|
*/
|
|
dqp->q_ino.count++;
|
|
dqp->q_ino.reserved++;
|
|
if (nblks) {
|
|
dqp->q_blk.count += nblks;
|
|
dqp->q_blk.reserved += nblks;
|
|
}
|
|
if (rtblks) {
|
|
dqp->q_rtb.count += rtblks;
|
|
dqp->q_rtb.reserved += rtblks;
|
|
}
|
|
|
|
/*
|
|
* Set default limits, adjust timers (since we changed usages)
|
|
*
|
|
* There are no timers for the default values set in the root dquot.
|
|
*/
|
|
if (dqp->q_id) {
|
|
xfs_qm_adjust_dqlimits(dqp);
|
|
xfs_qm_adjust_dqtimers(dqp);
|
|
}
|
|
|
|
dqp->q_flags |= XFS_DQFLAG_DIRTY;
|
|
xfs_qm_dqput(dqp);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* callback routine supplied to bulkstat(). Given an inumber, find its
|
|
* dquots and update them to account for resources taken by that inode.
|
|
*/
|
|
/* ARGSUSED */
|
|
STATIC int
|
|
xfs_qm_dqusage_adjust(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
xfs_ino_t ino,
|
|
void *data)
|
|
{
|
|
struct xfs_inode *ip;
|
|
xfs_qcnt_t nblks;
|
|
xfs_filblks_t rtblks = 0; /* total rt blks */
|
|
int error;
|
|
|
|
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
|
|
|
|
/*
|
|
* rootino must have its resources accounted for, not so with the quota
|
|
* inodes.
|
|
*/
|
|
if (xfs_is_quota_inode(&mp->m_sb, ino))
|
|
return 0;
|
|
|
|
/*
|
|
* We don't _need_ to take the ilock EXCL here because quotacheck runs
|
|
* at mount time and therefore nobody will be racing chown/chproj.
|
|
*/
|
|
error = xfs_iget(mp, tp, ino, XFS_IGET_DONTCACHE, 0, &ip);
|
|
if (error == -EINVAL || error == -ENOENT)
|
|
return 0;
|
|
if (error)
|
|
return error;
|
|
|
|
ASSERT(ip->i_delayed_blks == 0);
|
|
|
|
if (XFS_IS_REALTIME_INODE(ip)) {
|
|
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
|
|
|
|
if (!(ifp->if_flags & XFS_IFEXTENTS)) {
|
|
error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
|
|
if (error)
|
|
goto error0;
|
|
}
|
|
|
|
xfs_bmap_count_leaves(ifp, &rtblks);
|
|
}
|
|
|
|
nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
|
|
|
|
/*
|
|
* Add the (disk blocks and inode) resources occupied by this
|
|
* inode to its dquots. We do this adjustment in the incore dquot,
|
|
* and also copy the changes to its buffer.
|
|
* We don't care about putting these changes in a transaction
|
|
* envelope because if we crash in the middle of a 'quotacheck'
|
|
* we have to start from the beginning anyway.
|
|
* Once we're done, we'll log all the dquot bufs.
|
|
*
|
|
* The *QUOTA_ON checks below may look pretty racy, but quotachecks
|
|
* and quotaoffs don't race. (Quotachecks happen at mount time only).
|
|
*/
|
|
if (XFS_IS_UQUOTA_ON(mp)) {
|
|
error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_USER, nblks,
|
|
rtblks);
|
|
if (error)
|
|
goto error0;
|
|
}
|
|
|
|
if (XFS_IS_GQUOTA_ON(mp)) {
|
|
error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_GROUP, nblks,
|
|
rtblks);
|
|
if (error)
|
|
goto error0;
|
|
}
|
|
|
|
if (XFS_IS_PQUOTA_ON(mp)) {
|
|
error = xfs_qm_quotacheck_dqadjust(ip, XFS_DQTYPE_PROJ, nblks,
|
|
rtblks);
|
|
if (error)
|
|
goto error0;
|
|
}
|
|
|
|
error0:
|
|
xfs_irele(ip);
|
|
return error;
|
|
}
|
|
|
|
STATIC int
|
|
xfs_qm_flush_one(
|
|
struct xfs_dquot *dqp,
|
|
void *data)
|
|
{
|
|
struct xfs_mount *mp = dqp->q_mount;
|
|
struct list_head *buffer_list = data;
|
|
struct xfs_buf *bp = NULL;
|
|
int error = 0;
|
|
|
|
xfs_dqlock(dqp);
|
|
if (dqp->q_flags & XFS_DQFLAG_FREEING)
|
|
goto out_unlock;
|
|
if (!XFS_DQ_IS_DIRTY(dqp))
|
|
goto out_unlock;
|
|
|
|
/*
|
|
* The only way the dquot is already flush locked by the time quotacheck
|
|
* gets here is if reclaim flushed it before the dqadjust walk dirtied
|
|
* it for the final time. Quotacheck collects all dquot bufs in the
|
|
* local delwri queue before dquots are dirtied, so reclaim can't have
|
|
* possibly queued it for I/O. The only way out is to push the buffer to
|
|
* cycle the flush lock.
|
|
*/
|
|
if (!xfs_dqflock_nowait(dqp)) {
|
|
/* buf is pinned in-core by delwri list */
|
|
bp = xfs_buf_incore(mp->m_ddev_targp, dqp->q_blkno,
|
|
mp->m_quotainfo->qi_dqchunklen, 0);
|
|
if (!bp) {
|
|
error = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
xfs_buf_unlock(bp);
|
|
|
|
xfs_buf_delwri_pushbuf(bp, buffer_list);
|
|
xfs_buf_rele(bp);
|
|
|
|
error = -EAGAIN;
|
|
goto out_unlock;
|
|
}
|
|
|
|
error = xfs_qm_dqflush(dqp, &bp);
|
|
if (error)
|
|
goto out_unlock;
|
|
|
|
xfs_buf_delwri_queue(bp, buffer_list);
|
|
xfs_buf_relse(bp);
|
|
out_unlock:
|
|
xfs_dqunlock(dqp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Walk thru all the filesystem inodes and construct a consistent view
|
|
* of the disk quota world. If the quotacheck fails, disable quotas.
|
|
*/
|
|
STATIC int
|
|
xfs_qm_quotacheck(
|
|
xfs_mount_t *mp)
|
|
{
|
|
int error, error2;
|
|
uint flags;
|
|
LIST_HEAD (buffer_list);
|
|
struct xfs_inode *uip = mp->m_quotainfo->qi_uquotaip;
|
|
struct xfs_inode *gip = mp->m_quotainfo->qi_gquotaip;
|
|
struct xfs_inode *pip = mp->m_quotainfo->qi_pquotaip;
|
|
|
|
flags = 0;
|
|
|
|
ASSERT(uip || gip || pip);
|
|
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
|
|
|
|
xfs_notice(mp, "Quotacheck needed: Please wait.");
|
|
|
|
/*
|
|
* First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
|
|
* their counters to zero. We need a clean slate.
|
|
* We don't log our changes till later.
|
|
*/
|
|
if (uip) {
|
|
error = xfs_qm_reset_dqcounts_buf(mp, uip, XFS_DQTYPE_USER,
|
|
&buffer_list);
|
|
if (error)
|
|
goto error_return;
|
|
flags |= XFS_UQUOTA_CHKD;
|
|
}
|
|
|
|
if (gip) {
|
|
error = xfs_qm_reset_dqcounts_buf(mp, gip, XFS_DQTYPE_GROUP,
|
|
&buffer_list);
|
|
if (error)
|
|
goto error_return;
|
|
flags |= XFS_GQUOTA_CHKD;
|
|
}
|
|
|
|
if (pip) {
|
|
error = xfs_qm_reset_dqcounts_buf(mp, pip, XFS_DQTYPE_PROJ,
|
|
&buffer_list);
|
|
if (error)
|
|
goto error_return;
|
|
flags |= XFS_PQUOTA_CHKD;
|
|
}
|
|
|
|
error = xfs_iwalk_threaded(mp, 0, 0, xfs_qm_dqusage_adjust, 0, true,
|
|
NULL);
|
|
if (error)
|
|
goto error_return;
|
|
|
|
/*
|
|
* We've made all the changes that we need to make incore. Flush them
|
|
* down to disk buffers if everything was updated successfully.
|
|
*/
|
|
if (XFS_IS_UQUOTA_ON(mp)) {
|
|
error = xfs_qm_dquot_walk(mp, XFS_DQTYPE_USER, xfs_qm_flush_one,
|
|
&buffer_list);
|
|
}
|
|
if (XFS_IS_GQUOTA_ON(mp)) {
|
|
error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_GROUP, xfs_qm_flush_one,
|
|
&buffer_list);
|
|
if (!error)
|
|
error = error2;
|
|
}
|
|
if (XFS_IS_PQUOTA_ON(mp)) {
|
|
error2 = xfs_qm_dquot_walk(mp, XFS_DQTYPE_PROJ, xfs_qm_flush_one,
|
|
&buffer_list);
|
|
if (!error)
|
|
error = error2;
|
|
}
|
|
|
|
error2 = xfs_buf_delwri_submit(&buffer_list);
|
|
if (!error)
|
|
error = error2;
|
|
|
|
/*
|
|
* We can get this error if we couldn't do a dquot allocation inside
|
|
* xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
|
|
* dirty dquots that might be cached, we just want to get rid of them
|
|
* and turn quotaoff. The dquots won't be attached to any of the inodes
|
|
* at this point (because we intentionally didn't in dqget_noattach).
|
|
*/
|
|
if (error) {
|
|
xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
|
|
goto error_return;
|
|
}
|
|
|
|
/*
|
|
* If one type of quotas is off, then it will lose its
|
|
* quotachecked status, since we won't be doing accounting for
|
|
* that type anymore.
|
|
*/
|
|
mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
|
|
mp->m_qflags |= flags;
|
|
|
|
error_return:
|
|
xfs_buf_delwri_cancel(&buffer_list);
|
|
|
|
if (error) {
|
|
xfs_warn(mp,
|
|
"Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
|
|
error);
|
|
/*
|
|
* We must turn off quotas.
|
|
*/
|
|
ASSERT(mp->m_quotainfo != NULL);
|
|
xfs_qm_destroy_quotainfo(mp);
|
|
if (xfs_mount_reset_sbqflags(mp)) {
|
|
xfs_warn(mp,
|
|
"Quotacheck: Failed to reset quota flags.");
|
|
}
|
|
} else
|
|
xfs_notice(mp, "Quotacheck: Done.");
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* This is called from xfs_mountfs to start quotas and initialize all
|
|
* necessary data structures like quotainfo. This is also responsible for
|
|
* running a quotacheck as necessary. We are guaranteed that the superblock
|
|
* is consistently read in at this point.
|
|
*
|
|
* If we fail here, the mount will continue with quota turned off. We don't
|
|
* need to inidicate success or failure at all.
|
|
*/
|
|
void
|
|
xfs_qm_mount_quotas(
|
|
struct xfs_mount *mp)
|
|
{
|
|
int error = 0;
|
|
uint sbf;
|
|
|
|
/*
|
|
* If quotas on realtime volumes is not supported, we disable
|
|
* quotas immediately.
|
|
*/
|
|
if (mp->m_sb.sb_rextents) {
|
|
xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
|
|
mp->m_qflags = 0;
|
|
goto write_changes;
|
|
}
|
|
|
|
ASSERT(XFS_IS_QUOTA_RUNNING(mp));
|
|
|
|
/*
|
|
* Allocate the quotainfo structure inside the mount struct, and
|
|
* create quotainode(s), and change/rev superblock if necessary.
|
|
*/
|
|
error = xfs_qm_init_quotainfo(mp);
|
|
if (error) {
|
|
/*
|
|
* We must turn off quotas.
|
|
*/
|
|
ASSERT(mp->m_quotainfo == NULL);
|
|
mp->m_qflags = 0;
|
|
goto write_changes;
|
|
}
|
|
/*
|
|
* If any of the quotas are not consistent, do a quotacheck.
|
|
*/
|
|
if (XFS_QM_NEED_QUOTACHECK(mp)) {
|
|
error = xfs_qm_quotacheck(mp);
|
|
if (error) {
|
|
/* Quotacheck failed and disabled quotas. */
|
|
return;
|
|
}
|
|
}
|
|
/*
|
|
* If one type of quotas is off, then it will lose its
|
|
* quotachecked status, since we won't be doing accounting for
|
|
* that type anymore.
|
|
*/
|
|
if (!XFS_IS_UQUOTA_ON(mp))
|
|
mp->m_qflags &= ~XFS_UQUOTA_CHKD;
|
|
if (!XFS_IS_GQUOTA_ON(mp))
|
|
mp->m_qflags &= ~XFS_GQUOTA_CHKD;
|
|
if (!XFS_IS_PQUOTA_ON(mp))
|
|
mp->m_qflags &= ~XFS_PQUOTA_CHKD;
|
|
|
|
write_changes:
|
|
/*
|
|
* We actually don't have to acquire the m_sb_lock at all.
|
|
* This can only be called from mount, and that's single threaded. XXX
|
|
*/
|
|
spin_lock(&mp->m_sb_lock);
|
|
sbf = mp->m_sb.sb_qflags;
|
|
mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
|
|
spin_unlock(&mp->m_sb_lock);
|
|
|
|
if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
|
|
if (xfs_sync_sb(mp, false)) {
|
|
/*
|
|
* We could only have been turning quotas off.
|
|
* We aren't in very good shape actually because
|
|
* the incore structures are convinced that quotas are
|
|
* off, but the on disk superblock doesn't know that !
|
|
*/
|
|
ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
|
|
xfs_alert(mp, "%s: Superblock update failed!",
|
|
__func__);
|
|
}
|
|
}
|
|
|
|
if (error) {
|
|
xfs_warn(mp, "Failed to initialize disk quotas.");
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is called after the superblock has been read in and we're ready to
|
|
* iget the quota inodes.
|
|
*/
|
|
STATIC int
|
|
xfs_qm_init_quotainos(
|
|
xfs_mount_t *mp)
|
|
{
|
|
struct xfs_inode *uip = NULL;
|
|
struct xfs_inode *gip = NULL;
|
|
struct xfs_inode *pip = NULL;
|
|
int error;
|
|
uint flags = 0;
|
|
|
|
ASSERT(mp->m_quotainfo);
|
|
|
|
/*
|
|
* Get the uquota and gquota inodes
|
|
*/
|
|
if (xfs_sb_version_hasquota(&mp->m_sb)) {
|
|
if (XFS_IS_UQUOTA_ON(mp) &&
|
|
mp->m_sb.sb_uquotino != NULLFSINO) {
|
|
ASSERT(mp->m_sb.sb_uquotino > 0);
|
|
error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
|
|
0, 0, &uip);
|
|
if (error)
|
|
return error;
|
|
}
|
|
if (XFS_IS_GQUOTA_ON(mp) &&
|
|
mp->m_sb.sb_gquotino != NULLFSINO) {
|
|
ASSERT(mp->m_sb.sb_gquotino > 0);
|
|
error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
|
|
0, 0, &gip);
|
|
if (error)
|
|
goto error_rele;
|
|
}
|
|
if (XFS_IS_PQUOTA_ON(mp) &&
|
|
mp->m_sb.sb_pquotino != NULLFSINO) {
|
|
ASSERT(mp->m_sb.sb_pquotino > 0);
|
|
error = xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
|
|
0, 0, &pip);
|
|
if (error)
|
|
goto error_rele;
|
|
}
|
|
} else {
|
|
flags |= XFS_QMOPT_SBVERSION;
|
|
}
|
|
|
|
/*
|
|
* Create the three inodes, if they don't exist already. The changes
|
|
* made above will get added to a transaction and logged in one of
|
|
* the qino_alloc calls below. If the device is readonly,
|
|
* temporarily switch to read-write to do this.
|
|
*/
|
|
if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
|
|
error = xfs_qm_qino_alloc(mp, &uip,
|
|
flags | XFS_QMOPT_UQUOTA);
|
|
if (error)
|
|
goto error_rele;
|
|
|
|
flags &= ~XFS_QMOPT_SBVERSION;
|
|
}
|
|
if (XFS_IS_GQUOTA_ON(mp) && gip == NULL) {
|
|
error = xfs_qm_qino_alloc(mp, &gip,
|
|
flags | XFS_QMOPT_GQUOTA);
|
|
if (error)
|
|
goto error_rele;
|
|
|
|
flags &= ~XFS_QMOPT_SBVERSION;
|
|
}
|
|
if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
|
|
error = xfs_qm_qino_alloc(mp, &pip,
|
|
flags | XFS_QMOPT_PQUOTA);
|
|
if (error)
|
|
goto error_rele;
|
|
}
|
|
|
|
mp->m_quotainfo->qi_uquotaip = uip;
|
|
mp->m_quotainfo->qi_gquotaip = gip;
|
|
mp->m_quotainfo->qi_pquotaip = pip;
|
|
|
|
return 0;
|
|
|
|
error_rele:
|
|
if (uip)
|
|
xfs_irele(uip);
|
|
if (gip)
|
|
xfs_irele(gip);
|
|
if (pip)
|
|
xfs_irele(pip);
|
|
return error;
|
|
}
|
|
|
|
STATIC void
|
|
xfs_qm_destroy_quotainos(
|
|
struct xfs_quotainfo *qi)
|
|
{
|
|
if (qi->qi_uquotaip) {
|
|
xfs_irele(qi->qi_uquotaip);
|
|
qi->qi_uquotaip = NULL; /* paranoia */
|
|
}
|
|
if (qi->qi_gquotaip) {
|
|
xfs_irele(qi->qi_gquotaip);
|
|
qi->qi_gquotaip = NULL;
|
|
}
|
|
if (qi->qi_pquotaip) {
|
|
xfs_irele(qi->qi_pquotaip);
|
|
qi->qi_pquotaip = NULL;
|
|
}
|
|
}
|
|
|
|
STATIC void
|
|
xfs_qm_dqfree_one(
|
|
struct xfs_dquot *dqp)
|
|
{
|
|
struct xfs_mount *mp = dqp->q_mount;
|
|
struct xfs_quotainfo *qi = mp->m_quotainfo;
|
|
|
|
mutex_lock(&qi->qi_tree_lock);
|
|
radix_tree_delete(xfs_dquot_tree(qi, xfs_dquot_type(dqp)), dqp->q_id);
|
|
|
|
qi->qi_dquots--;
|
|
mutex_unlock(&qi->qi_tree_lock);
|
|
|
|
xfs_qm_dqdestroy(dqp);
|
|
}
|
|
|
|
/* --------------- utility functions for vnodeops ---------------- */
|
|
|
|
|
|
/*
|
|
* Given an inode, a uid, gid and prid make sure that we have
|
|
* allocated relevant dquot(s) on disk, and that we won't exceed inode
|
|
* quotas by creating this file.
|
|
* This also attaches dquot(s) to the given inode after locking it,
|
|
* and returns the dquots corresponding to the uid and/or gid.
|
|
*
|
|
* in : inode (unlocked)
|
|
* out : udquot, gdquot with references taken and unlocked
|
|
*/
|
|
int
|
|
xfs_qm_vop_dqalloc(
|
|
struct xfs_inode *ip,
|
|
kuid_t uid,
|
|
kgid_t gid,
|
|
prid_t prid,
|
|
uint flags,
|
|
struct xfs_dquot **O_udqpp,
|
|
struct xfs_dquot **O_gdqpp,
|
|
struct xfs_dquot **O_pdqpp)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct inode *inode = VFS_I(ip);
|
|
struct user_namespace *user_ns = inode->i_sb->s_user_ns;
|
|
struct xfs_dquot *uq = NULL;
|
|
struct xfs_dquot *gq = NULL;
|
|
struct xfs_dquot *pq = NULL;
|
|
int error;
|
|
uint lockflags;
|
|
|
|
if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
|
|
return 0;
|
|
|
|
lockflags = XFS_ILOCK_EXCL;
|
|
xfs_ilock(ip, lockflags);
|
|
|
|
if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
|
|
gid = inode->i_gid;
|
|
|
|
/*
|
|
* Attach the dquot(s) to this inode, doing a dquot allocation
|
|
* if necessary. The dquot(s) will not be locked.
|
|
*/
|
|
if (XFS_NOT_DQATTACHED(mp, ip)) {
|
|
error = xfs_qm_dqattach_locked(ip, true);
|
|
if (error) {
|
|
xfs_iunlock(ip, lockflags);
|
|
return error;
|
|
}
|
|
}
|
|
|
|
if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
|
|
ASSERT(O_udqpp);
|
|
if (!uid_eq(inode->i_uid, uid)) {
|
|
/*
|
|
* What we need is the dquot that has this uid, and
|
|
* if we send the inode to dqget, the uid of the inode
|
|
* takes priority over what's sent in the uid argument.
|
|
* We must unlock inode here before calling dqget if
|
|
* we're not sending the inode, because otherwise
|
|
* we'll deadlock by doing trans_reserve while
|
|
* holding ilock.
|
|
*/
|
|
xfs_iunlock(ip, lockflags);
|
|
error = xfs_qm_dqget(mp, from_kuid(user_ns, uid),
|
|
XFS_DQTYPE_USER, true, &uq);
|
|
if (error) {
|
|
ASSERT(error != -ENOENT);
|
|
return error;
|
|
}
|
|
/*
|
|
* Get the ilock in the right order.
|
|
*/
|
|
xfs_dqunlock(uq);
|
|
lockflags = XFS_ILOCK_SHARED;
|
|
xfs_ilock(ip, lockflags);
|
|
} else {
|
|
/*
|
|
* Take an extra reference, because we'll return
|
|
* this to caller
|
|
*/
|
|
ASSERT(ip->i_udquot);
|
|
uq = xfs_qm_dqhold(ip->i_udquot);
|
|
}
|
|
}
|
|
if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
|
|
ASSERT(O_gdqpp);
|
|
if (!gid_eq(inode->i_gid, gid)) {
|
|
xfs_iunlock(ip, lockflags);
|
|
error = xfs_qm_dqget(mp, from_kgid(user_ns, gid),
|
|
XFS_DQTYPE_GROUP, true, &gq);
|
|
if (error) {
|
|
ASSERT(error != -ENOENT);
|
|
goto error_rele;
|
|
}
|
|
xfs_dqunlock(gq);
|
|
lockflags = XFS_ILOCK_SHARED;
|
|
xfs_ilock(ip, lockflags);
|
|
} else {
|
|
ASSERT(ip->i_gdquot);
|
|
gq = xfs_qm_dqhold(ip->i_gdquot);
|
|
}
|
|
}
|
|
if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
|
|
ASSERT(O_pdqpp);
|
|
if (ip->i_d.di_projid != prid) {
|
|
xfs_iunlock(ip, lockflags);
|
|
error = xfs_qm_dqget(mp, prid,
|
|
XFS_DQTYPE_PROJ, true, &pq);
|
|
if (error) {
|
|
ASSERT(error != -ENOENT);
|
|
goto error_rele;
|
|
}
|
|
xfs_dqunlock(pq);
|
|
lockflags = XFS_ILOCK_SHARED;
|
|
xfs_ilock(ip, lockflags);
|
|
} else {
|
|
ASSERT(ip->i_pdquot);
|
|
pq = xfs_qm_dqhold(ip->i_pdquot);
|
|
}
|
|
}
|
|
trace_xfs_dquot_dqalloc(ip);
|
|
|
|
xfs_iunlock(ip, lockflags);
|
|
if (O_udqpp)
|
|
*O_udqpp = uq;
|
|
else
|
|
xfs_qm_dqrele(uq);
|
|
if (O_gdqpp)
|
|
*O_gdqpp = gq;
|
|
else
|
|
xfs_qm_dqrele(gq);
|
|
if (O_pdqpp)
|
|
*O_pdqpp = pq;
|
|
else
|
|
xfs_qm_dqrele(pq);
|
|
return 0;
|
|
|
|
error_rele:
|
|
xfs_qm_dqrele(gq);
|
|
xfs_qm_dqrele(uq);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Actually transfer ownership, and do dquot modifications.
|
|
* These were already reserved.
|
|
*/
|
|
struct xfs_dquot *
|
|
xfs_qm_vop_chown(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_dquot **IO_olddq,
|
|
struct xfs_dquot *newdq)
|
|
{
|
|
struct xfs_dquot *prevdq;
|
|
uint bfield = XFS_IS_REALTIME_INODE(ip) ?
|
|
XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
|
|
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
|
|
|
|
/* old dquot */
|
|
prevdq = *IO_olddq;
|
|
ASSERT(prevdq);
|
|
ASSERT(prevdq != newdq);
|
|
|
|
xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
|
|
xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
|
|
|
|
/* the sparkling new dquot */
|
|
xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
|
|
xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
|
|
|
|
/*
|
|
* Back when we made quota reservations for the chown, we reserved the
|
|
* ondisk blocks + delalloc blocks with the new dquot. Now that we've
|
|
* switched the dquots, decrease the new dquot's block reservation
|
|
* (having already bumped up the real counter) so that we don't have
|
|
* any reservation to give back when we commit.
|
|
*/
|
|
xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_RES_BLKS,
|
|
-ip->i_delayed_blks);
|
|
|
|
/*
|
|
* Give the incore reservation for delalloc blocks back to the old
|
|
* dquot. We don't normally handle delalloc quota reservations
|
|
* transactionally, so just lock the dquot and subtract from the
|
|
* reservation. Dirty the transaction because it's too late to turn
|
|
* back now.
|
|
*/
|
|
tp->t_flags |= XFS_TRANS_DIRTY;
|
|
xfs_dqlock(prevdq);
|
|
ASSERT(prevdq->q_blk.reserved >= ip->i_delayed_blks);
|
|
prevdq->q_blk.reserved -= ip->i_delayed_blks;
|
|
xfs_dqunlock(prevdq);
|
|
|
|
/*
|
|
* Take an extra reference, because the inode is going to keep
|
|
* this dquot pointer even after the trans_commit.
|
|
*/
|
|
*IO_olddq = xfs_qm_dqhold(newdq);
|
|
|
|
return prevdq;
|
|
}
|
|
|
|
int
|
|
xfs_qm_vop_rename_dqattach(
|
|
struct xfs_inode **i_tab)
|
|
{
|
|
struct xfs_mount *mp = i_tab[0]->i_mount;
|
|
int i;
|
|
|
|
if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
|
|
return 0;
|
|
|
|
for (i = 0; (i < 4 && i_tab[i]); i++) {
|
|
struct xfs_inode *ip = i_tab[i];
|
|
int error;
|
|
|
|
/*
|
|
* Watch out for duplicate entries in the table.
|
|
*/
|
|
if (i == 0 || ip != i_tab[i-1]) {
|
|
if (XFS_NOT_DQATTACHED(mp, ip)) {
|
|
error = xfs_qm_dqattach(ip);
|
|
if (error)
|
|
return error;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
xfs_qm_vop_create_dqattach(
|
|
struct xfs_trans *tp,
|
|
struct xfs_inode *ip,
|
|
struct xfs_dquot *udqp,
|
|
struct xfs_dquot *gdqp,
|
|
struct xfs_dquot *pdqp)
|
|
{
|
|
struct xfs_mount *mp = tp->t_mountp;
|
|
|
|
if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
|
|
return;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
if (udqp && XFS_IS_UQUOTA_ON(mp)) {
|
|
ASSERT(ip->i_udquot == NULL);
|
|
ASSERT(i_uid_read(VFS_I(ip)) == udqp->q_id);
|
|
|
|
ip->i_udquot = xfs_qm_dqhold(udqp);
|
|
xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
|
|
}
|
|
if (gdqp && XFS_IS_GQUOTA_ON(mp)) {
|
|
ASSERT(ip->i_gdquot == NULL);
|
|
ASSERT(i_gid_read(VFS_I(ip)) == gdqp->q_id);
|
|
|
|
ip->i_gdquot = xfs_qm_dqhold(gdqp);
|
|
xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
|
|
}
|
|
if (pdqp && XFS_IS_PQUOTA_ON(mp)) {
|
|
ASSERT(ip->i_pdquot == NULL);
|
|
ASSERT(ip->i_d.di_projid == pdqp->q_id);
|
|
|
|
ip->i_pdquot = xfs_qm_dqhold(pdqp);
|
|
xfs_trans_mod_dquot(tp, pdqp, XFS_TRANS_DQ_ICOUNT, 1);
|
|
}
|
|
}
|
|
|