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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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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
...
2390 lines
65 KiB
C
2390 lines
65 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/ceph_debug.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/kernel.h>
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#include <linux/writeback.h>
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#include <linux/vmalloc.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl.h>
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#include <linux/random.h>
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#include <linux/sort.h>
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#include <linux/iversion.h>
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#include "super.h"
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#include "mds_client.h"
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#include "cache.h"
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#include <linux/ceph/decode.h>
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|
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/*
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* Ceph inode operations
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*
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* Implement basic inode helpers (get, alloc) and inode ops (getattr,
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* setattr, etc.), xattr helpers, and helpers for assimilating
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|
* metadata returned by the MDS into our cache.
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*
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* Also define helpers for doing asynchronous writeback, invalidation,
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* and truncation for the benefit of those who can't afford to block
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* (typically because they are in the message handler path).
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*/
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static const struct inode_operations ceph_symlink_iops;
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static void ceph_inode_work(struct work_struct *work);
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|
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/*
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* find or create an inode, given the ceph ino number
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*/
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static int ceph_set_ino_cb(struct inode *inode, void *data)
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|
{
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struct ceph_inode_info *ci = ceph_inode(inode);
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struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
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ci->i_vino = *(struct ceph_vino *)data;
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inode->i_ino = ceph_vino_to_ino_t(ci->i_vino);
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inode_set_iversion_raw(inode, 0);
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percpu_counter_inc(&mdsc->metric.total_inodes);
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return 0;
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}
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struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino)
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{
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struct inode *inode;
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inode = iget5_locked(sb, (unsigned long)vino.ino, ceph_ino_compare,
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ceph_set_ino_cb, &vino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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dout("get_inode on %llu=%llx.%llx got %p new %d\n", ceph_present_inode(inode),
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ceph_vinop(inode), inode, !!(inode->i_state & I_NEW));
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return inode;
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}
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|
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/*
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* get/constuct snapdir inode for a given directory
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*/
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struct inode *ceph_get_snapdir(struct inode *parent)
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{
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struct ceph_vino vino = {
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.ino = ceph_ino(parent),
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.snap = CEPH_SNAPDIR,
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};
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struct inode *inode = ceph_get_inode(parent->i_sb, vino);
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struct ceph_inode_info *ci = ceph_inode(inode);
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BUG_ON(!S_ISDIR(parent->i_mode));
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if (IS_ERR(inode))
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return inode;
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inode->i_mode = parent->i_mode;
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inode->i_uid = parent->i_uid;
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inode->i_gid = parent->i_gid;
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inode->i_mtime = parent->i_mtime;
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inode->i_ctime = parent->i_ctime;
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inode->i_atime = parent->i_atime;
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inode->i_op = &ceph_snapdir_iops;
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inode->i_fop = &ceph_snapdir_fops;
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ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */
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ci->i_rbytes = 0;
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ci->i_btime = ceph_inode(parent)->i_btime;
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|
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if (inode->i_state & I_NEW)
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unlock_new_inode(inode);
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|
|
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return inode;
|
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}
|
|
|
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const struct inode_operations ceph_file_iops = {
|
|
.permission = ceph_permission,
|
|
.setattr = ceph_setattr,
|
|
.getattr = ceph_getattr,
|
|
.listxattr = ceph_listxattr,
|
|
.get_acl = ceph_get_acl,
|
|
.set_acl = ceph_set_acl,
|
|
};
|
|
|
|
|
|
/*
|
|
* We use a 'frag tree' to keep track of the MDS's directory fragments
|
|
* for a given inode (usually there is just a single fragment). We
|
|
* need to know when a child frag is delegated to a new MDS, or when
|
|
* it is flagged as replicated, so we can direct our requests
|
|
* accordingly.
|
|
*/
|
|
|
|
/*
|
|
* find/create a frag in the tree
|
|
*/
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static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci,
|
|
u32 f)
|
|
{
|
|
struct rb_node **p;
|
|
struct rb_node *parent = NULL;
|
|
struct ceph_inode_frag *frag;
|
|
int c;
|
|
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|
p = &ci->i_fragtree.rb_node;
|
|
while (*p) {
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parent = *p;
|
|
frag = rb_entry(parent, struct ceph_inode_frag, node);
|
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c = ceph_frag_compare(f, frag->frag);
|
|
if (c < 0)
|
|
p = &(*p)->rb_left;
|
|
else if (c > 0)
|
|
p = &(*p)->rb_right;
|
|
else
|
|
return frag;
|
|
}
|
|
|
|
frag = kmalloc(sizeof(*frag), GFP_NOFS);
|
|
if (!frag)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
frag->frag = f;
|
|
frag->split_by = 0;
|
|
frag->mds = -1;
|
|
frag->ndist = 0;
|
|
|
|
rb_link_node(&frag->node, parent, p);
|
|
rb_insert_color(&frag->node, &ci->i_fragtree);
|
|
|
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dout("get_or_create_frag added %llx.%llx frag %x\n",
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ceph_vinop(&ci->vfs_inode), f);
|
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return frag;
|
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}
|
|
|
|
/*
|
|
* find a specific frag @f
|
|
*/
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struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f)
|
|
{
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struct rb_node *n = ci->i_fragtree.rb_node;
|
|
|
|
while (n) {
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struct ceph_inode_frag *frag =
|
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rb_entry(n, struct ceph_inode_frag, node);
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int c = ceph_frag_compare(f, frag->frag);
|
|
if (c < 0)
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n = n->rb_left;
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else if (c > 0)
|
|
n = n->rb_right;
|
|
else
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|
return frag;
|
|
}
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|
return NULL;
|
|
}
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|
|
|
/*
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|
* Choose frag containing the given value @v. If @pfrag is
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* specified, copy the frag delegation info to the caller if
|
|
* it is present.
|
|
*/
|
|
static u32 __ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
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|
struct ceph_inode_frag *pfrag, int *found)
|
|
{
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u32 t = ceph_frag_make(0, 0);
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struct ceph_inode_frag *frag;
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unsigned nway, i;
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u32 n;
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|
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if (found)
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*found = 0;
|
|
|
|
while (1) {
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WARN_ON(!ceph_frag_contains_value(t, v));
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frag = __ceph_find_frag(ci, t);
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|
if (!frag)
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break; /* t is a leaf */
|
|
if (frag->split_by == 0) {
|
|
if (pfrag)
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memcpy(pfrag, frag, sizeof(*pfrag));
|
|
if (found)
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*found = 1;
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|
break;
|
|
}
|
|
|
|
/* choose child */
|
|
nway = 1 << frag->split_by;
|
|
dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t,
|
|
frag->split_by, nway);
|
|
for (i = 0; i < nway; i++) {
|
|
n = ceph_frag_make_child(t, frag->split_by, i);
|
|
if (ceph_frag_contains_value(n, v)) {
|
|
t = n;
|
|
break;
|
|
}
|
|
}
|
|
BUG_ON(i == nway);
|
|
}
|
|
dout("choose_frag(%x) = %x\n", v, t);
|
|
|
|
return t;
|
|
}
|
|
|
|
u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v,
|
|
struct ceph_inode_frag *pfrag, int *found)
|
|
{
|
|
u32 ret;
|
|
mutex_lock(&ci->i_fragtree_mutex);
|
|
ret = __ceph_choose_frag(ci, v, pfrag, found);
|
|
mutex_unlock(&ci->i_fragtree_mutex);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Process dirfrag (delegation) info from the mds. Include leaf
|
|
* fragment in tree ONLY if ndist > 0. Otherwise, only
|
|
* branches/splits are included in i_fragtree)
|
|
*/
|
|
static int ceph_fill_dirfrag(struct inode *inode,
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|
struct ceph_mds_reply_dirfrag *dirinfo)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_inode_frag *frag;
|
|
u32 id = le32_to_cpu(dirinfo->frag);
|
|
int mds = le32_to_cpu(dirinfo->auth);
|
|
int ndist = le32_to_cpu(dirinfo->ndist);
|
|
int diri_auth = -1;
|
|
int i;
|
|
int err = 0;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (ci->i_auth_cap)
|
|
diri_auth = ci->i_auth_cap->mds;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (mds == -1) /* CDIR_AUTH_PARENT */
|
|
mds = diri_auth;
|
|
|
|
mutex_lock(&ci->i_fragtree_mutex);
|
|
if (ndist == 0 && mds == diri_auth) {
|
|
/* no delegation info needed. */
|
|
frag = __ceph_find_frag(ci, id);
|
|
if (!frag)
|
|
goto out;
|
|
if (frag->split_by == 0) {
|
|
/* tree leaf, remove */
|
|
dout("fill_dirfrag removed %llx.%llx frag %x"
|
|
" (no ref)\n", ceph_vinop(inode), id);
|
|
rb_erase(&frag->node, &ci->i_fragtree);
|
|
kfree(frag);
|
|
} else {
|
|
/* tree branch, keep and clear */
|
|
dout("fill_dirfrag cleared %llx.%llx frag %x"
|
|
" referral\n", ceph_vinop(inode), id);
|
|
frag->mds = -1;
|
|
frag->ndist = 0;
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
|
|
/* find/add this frag to store mds delegation info */
|
|
frag = __get_or_create_frag(ci, id);
|
|
if (IS_ERR(frag)) {
|
|
/* this is not the end of the world; we can continue
|
|
with bad/inaccurate delegation info */
|
|
pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n",
|
|
ceph_vinop(inode), le32_to_cpu(dirinfo->frag));
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
frag->mds = mds;
|
|
frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP);
|
|
for (i = 0; i < frag->ndist; i++)
|
|
frag->dist[i] = le32_to_cpu(dirinfo->dist[i]);
|
|
dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n",
|
|
ceph_vinop(inode), frag->frag, frag->ndist);
|
|
|
|
out:
|
|
mutex_unlock(&ci->i_fragtree_mutex);
|
|
return err;
|
|
}
|
|
|
|
static int frag_tree_split_cmp(const void *l, const void *r)
|
|
{
|
|
struct ceph_frag_tree_split *ls = (struct ceph_frag_tree_split*)l;
|
|
struct ceph_frag_tree_split *rs = (struct ceph_frag_tree_split*)r;
|
|
return ceph_frag_compare(le32_to_cpu(ls->frag),
|
|
le32_to_cpu(rs->frag));
|
|
}
|
|
|
|
static bool is_frag_child(u32 f, struct ceph_inode_frag *frag)
|
|
{
|
|
if (!frag)
|
|
return f == ceph_frag_make(0, 0);
|
|
if (ceph_frag_bits(f) != ceph_frag_bits(frag->frag) + frag->split_by)
|
|
return false;
|
|
return ceph_frag_contains_value(frag->frag, ceph_frag_value(f));
|
|
}
|
|
|
|
static int ceph_fill_fragtree(struct inode *inode,
|
|
struct ceph_frag_tree_head *fragtree,
|
|
struct ceph_mds_reply_dirfrag *dirinfo)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_inode_frag *frag, *prev_frag = NULL;
|
|
struct rb_node *rb_node;
|
|
unsigned i, split_by, nsplits;
|
|
u32 id;
|
|
bool update = false;
|
|
|
|
mutex_lock(&ci->i_fragtree_mutex);
|
|
nsplits = le32_to_cpu(fragtree->nsplits);
|
|
if (nsplits != ci->i_fragtree_nsplits) {
|
|
update = true;
|
|
} else if (nsplits) {
|
|
i = prandom_u32() % nsplits;
|
|
id = le32_to_cpu(fragtree->splits[i].frag);
|
|
if (!__ceph_find_frag(ci, id))
|
|
update = true;
|
|
} else if (!RB_EMPTY_ROOT(&ci->i_fragtree)) {
|
|
rb_node = rb_first(&ci->i_fragtree);
|
|
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
|
|
if (frag->frag != ceph_frag_make(0, 0) || rb_next(rb_node))
|
|
update = true;
|
|
}
|
|
if (!update && dirinfo) {
|
|
id = le32_to_cpu(dirinfo->frag);
|
|
if (id != __ceph_choose_frag(ci, id, NULL, NULL))
|
|
update = true;
|
|
}
|
|
if (!update)
|
|
goto out_unlock;
|
|
|
|
if (nsplits > 1) {
|
|
sort(fragtree->splits, nsplits, sizeof(fragtree->splits[0]),
|
|
frag_tree_split_cmp, NULL);
|
|
}
|
|
|
|
dout("fill_fragtree %llx.%llx\n", ceph_vinop(inode));
|
|
rb_node = rb_first(&ci->i_fragtree);
|
|
for (i = 0; i < nsplits; i++) {
|
|
id = le32_to_cpu(fragtree->splits[i].frag);
|
|
split_by = le32_to_cpu(fragtree->splits[i].by);
|
|
if (split_by == 0 || ceph_frag_bits(id) + split_by > 24) {
|
|
pr_err("fill_fragtree %llx.%llx invalid split %d/%u, "
|
|
"frag %x split by %d\n", ceph_vinop(inode),
|
|
i, nsplits, id, split_by);
|
|
continue;
|
|
}
|
|
frag = NULL;
|
|
while (rb_node) {
|
|
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
|
|
if (ceph_frag_compare(frag->frag, id) >= 0) {
|
|
if (frag->frag != id)
|
|
frag = NULL;
|
|
else
|
|
rb_node = rb_next(rb_node);
|
|
break;
|
|
}
|
|
rb_node = rb_next(rb_node);
|
|
/* delete stale split/leaf node */
|
|
if (frag->split_by > 0 ||
|
|
!is_frag_child(frag->frag, prev_frag)) {
|
|
rb_erase(&frag->node, &ci->i_fragtree);
|
|
if (frag->split_by > 0)
|
|
ci->i_fragtree_nsplits--;
|
|
kfree(frag);
|
|
}
|
|
frag = NULL;
|
|
}
|
|
if (!frag) {
|
|
frag = __get_or_create_frag(ci, id);
|
|
if (IS_ERR(frag))
|
|
continue;
|
|
}
|
|
if (frag->split_by == 0)
|
|
ci->i_fragtree_nsplits++;
|
|
frag->split_by = split_by;
|
|
dout(" frag %x split by %d\n", frag->frag, frag->split_by);
|
|
prev_frag = frag;
|
|
}
|
|
while (rb_node) {
|
|
frag = rb_entry(rb_node, struct ceph_inode_frag, node);
|
|
rb_node = rb_next(rb_node);
|
|
/* delete stale split/leaf node */
|
|
if (frag->split_by > 0 ||
|
|
!is_frag_child(frag->frag, prev_frag)) {
|
|
rb_erase(&frag->node, &ci->i_fragtree);
|
|
if (frag->split_by > 0)
|
|
ci->i_fragtree_nsplits--;
|
|
kfree(frag);
|
|
}
|
|
}
|
|
out_unlock:
|
|
mutex_unlock(&ci->i_fragtree_mutex);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* initialize a newly allocated inode.
|
|
*/
|
|
struct inode *ceph_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
int i;
|
|
|
|
ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS);
|
|
if (!ci)
|
|
return NULL;
|
|
|
|
dout("alloc_inode %p\n", &ci->vfs_inode);
|
|
|
|
spin_lock_init(&ci->i_ceph_lock);
|
|
|
|
ci->i_version = 0;
|
|
ci->i_inline_version = 0;
|
|
ci->i_time_warp_seq = 0;
|
|
ci->i_ceph_flags = 0;
|
|
atomic64_set(&ci->i_ordered_count, 1);
|
|
atomic64_set(&ci->i_release_count, 1);
|
|
atomic64_set(&ci->i_complete_seq[0], 0);
|
|
atomic64_set(&ci->i_complete_seq[1], 0);
|
|
ci->i_symlink = NULL;
|
|
|
|
ci->i_max_bytes = 0;
|
|
ci->i_max_files = 0;
|
|
|
|
memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout));
|
|
memset(&ci->i_cached_layout, 0, sizeof(ci->i_cached_layout));
|
|
RCU_INIT_POINTER(ci->i_layout.pool_ns, NULL);
|
|
|
|
ci->i_fragtree = RB_ROOT;
|
|
mutex_init(&ci->i_fragtree_mutex);
|
|
|
|
ci->i_xattrs.blob = NULL;
|
|
ci->i_xattrs.prealloc_blob = NULL;
|
|
ci->i_xattrs.dirty = false;
|
|
ci->i_xattrs.index = RB_ROOT;
|
|
ci->i_xattrs.count = 0;
|
|
ci->i_xattrs.names_size = 0;
|
|
ci->i_xattrs.vals_size = 0;
|
|
ci->i_xattrs.version = 0;
|
|
ci->i_xattrs.index_version = 0;
|
|
|
|
ci->i_caps = RB_ROOT;
|
|
ci->i_auth_cap = NULL;
|
|
ci->i_dirty_caps = 0;
|
|
ci->i_flushing_caps = 0;
|
|
INIT_LIST_HEAD(&ci->i_dirty_item);
|
|
INIT_LIST_HEAD(&ci->i_flushing_item);
|
|
ci->i_prealloc_cap_flush = NULL;
|
|
INIT_LIST_HEAD(&ci->i_cap_flush_list);
|
|
init_waitqueue_head(&ci->i_cap_wq);
|
|
ci->i_hold_caps_max = 0;
|
|
INIT_LIST_HEAD(&ci->i_cap_delay_list);
|
|
INIT_LIST_HEAD(&ci->i_cap_snaps);
|
|
ci->i_head_snapc = NULL;
|
|
ci->i_snap_caps = 0;
|
|
|
|
ci->i_last_rd = ci->i_last_wr = jiffies - 3600 * HZ;
|
|
for (i = 0; i < CEPH_FILE_MODE_BITS; i++)
|
|
ci->i_nr_by_mode[i] = 0;
|
|
|
|
mutex_init(&ci->i_truncate_mutex);
|
|
ci->i_truncate_seq = 0;
|
|
ci->i_truncate_size = 0;
|
|
ci->i_truncate_pending = 0;
|
|
|
|
ci->i_max_size = 0;
|
|
ci->i_reported_size = 0;
|
|
ci->i_wanted_max_size = 0;
|
|
ci->i_requested_max_size = 0;
|
|
|
|
ci->i_pin_ref = 0;
|
|
ci->i_rd_ref = 0;
|
|
ci->i_rdcache_ref = 0;
|
|
ci->i_wr_ref = 0;
|
|
ci->i_wb_ref = 0;
|
|
ci->i_fx_ref = 0;
|
|
ci->i_wrbuffer_ref = 0;
|
|
ci->i_wrbuffer_ref_head = 0;
|
|
atomic_set(&ci->i_filelock_ref, 0);
|
|
atomic_set(&ci->i_shared_gen, 1);
|
|
ci->i_rdcache_gen = 0;
|
|
ci->i_rdcache_revoking = 0;
|
|
|
|
INIT_LIST_HEAD(&ci->i_unsafe_dirops);
|
|
INIT_LIST_HEAD(&ci->i_unsafe_iops);
|
|
spin_lock_init(&ci->i_unsafe_lock);
|
|
|
|
ci->i_snap_realm = NULL;
|
|
INIT_LIST_HEAD(&ci->i_snap_realm_item);
|
|
INIT_LIST_HEAD(&ci->i_snap_flush_item);
|
|
|
|
INIT_WORK(&ci->i_work, ceph_inode_work);
|
|
ci->i_work_mask = 0;
|
|
memset(&ci->i_btime, '\0', sizeof(ci->i_btime));
|
|
|
|
ceph_fscache_inode_init(ci);
|
|
|
|
ci->i_meta_err = 0;
|
|
|
|
return &ci->vfs_inode;
|
|
}
|
|
|
|
void ceph_free_inode(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
|
|
kfree(ci->i_symlink);
|
|
kmem_cache_free(ceph_inode_cachep, ci);
|
|
}
|
|
|
|
void ceph_evict_inode(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
|
|
struct ceph_inode_frag *frag;
|
|
struct rb_node *n;
|
|
|
|
dout("evict_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode));
|
|
|
|
percpu_counter_dec(&mdsc->metric.total_inodes);
|
|
|
|
truncate_inode_pages_final(&inode->i_data);
|
|
clear_inode(inode);
|
|
|
|
ceph_fscache_unregister_inode_cookie(ci);
|
|
|
|
__ceph_remove_caps(ci);
|
|
|
|
if (__ceph_has_any_quota(ci))
|
|
ceph_adjust_quota_realms_count(inode, false);
|
|
|
|
/*
|
|
* we may still have a snap_realm reference if there are stray
|
|
* caps in i_snap_caps.
|
|
*/
|
|
if (ci->i_snap_realm) {
|
|
if (ceph_snap(inode) == CEPH_NOSNAP) {
|
|
struct ceph_snap_realm *realm = ci->i_snap_realm;
|
|
dout(" dropping residual ref to snap realm %p\n",
|
|
realm);
|
|
spin_lock(&realm->inodes_with_caps_lock);
|
|
list_del_init(&ci->i_snap_realm_item);
|
|
ci->i_snap_realm = NULL;
|
|
if (realm->ino == ci->i_vino.ino)
|
|
realm->inode = NULL;
|
|
spin_unlock(&realm->inodes_with_caps_lock);
|
|
ceph_put_snap_realm(mdsc, realm);
|
|
} else {
|
|
ceph_put_snapid_map(mdsc, ci->i_snapid_map);
|
|
ci->i_snap_realm = NULL;
|
|
}
|
|
}
|
|
|
|
while ((n = rb_first(&ci->i_fragtree)) != NULL) {
|
|
frag = rb_entry(n, struct ceph_inode_frag, node);
|
|
rb_erase(n, &ci->i_fragtree);
|
|
kfree(frag);
|
|
}
|
|
ci->i_fragtree_nsplits = 0;
|
|
|
|
__ceph_destroy_xattrs(ci);
|
|
if (ci->i_xattrs.blob)
|
|
ceph_buffer_put(ci->i_xattrs.blob);
|
|
if (ci->i_xattrs.prealloc_blob)
|
|
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
|
|
|
|
ceph_put_string(rcu_dereference_raw(ci->i_layout.pool_ns));
|
|
ceph_put_string(rcu_dereference_raw(ci->i_cached_layout.pool_ns));
|
|
}
|
|
|
|
static inline blkcnt_t calc_inode_blocks(u64 size)
|
|
{
|
|
return (size + (1<<9) - 1) >> 9;
|
|
}
|
|
|
|
/*
|
|
* Helpers to fill in size, ctime, mtime, and atime. We have to be
|
|
* careful because either the client or MDS may have more up to date
|
|
* info, depending on which capabilities are held, and whether
|
|
* time_warp_seq or truncate_seq have increased. (Ordinarily, mtime
|
|
* and size are monotonically increasing, except when utimes() or
|
|
* truncate() increments the corresponding _seq values.)
|
|
*/
|
|
int ceph_fill_file_size(struct inode *inode, int issued,
|
|
u32 truncate_seq, u64 truncate_size, u64 size)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int queue_trunc = 0;
|
|
|
|
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 ||
|
|
(truncate_seq == ci->i_truncate_seq && size > inode->i_size)) {
|
|
dout("size %lld -> %llu\n", inode->i_size, size);
|
|
if (size > 0 && S_ISDIR(inode->i_mode)) {
|
|
pr_err("fill_file_size non-zero size for directory\n");
|
|
size = 0;
|
|
}
|
|
i_size_write(inode, size);
|
|
inode->i_blocks = calc_inode_blocks(size);
|
|
ci->i_reported_size = size;
|
|
if (truncate_seq != ci->i_truncate_seq) {
|
|
dout("truncate_seq %u -> %u\n",
|
|
ci->i_truncate_seq, truncate_seq);
|
|
ci->i_truncate_seq = truncate_seq;
|
|
|
|
/* the MDS should have revoked these caps */
|
|
WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL |
|
|
CEPH_CAP_FILE_RD |
|
|
CEPH_CAP_FILE_WR |
|
|
CEPH_CAP_FILE_LAZYIO));
|
|
/*
|
|
* If we hold relevant caps, or in the case where we're
|
|
* not the only client referencing this file and we
|
|
* don't hold those caps, then we need to check whether
|
|
* the file is either opened or mmaped
|
|
*/
|
|
if ((issued & (CEPH_CAP_FILE_CACHE|
|
|
CEPH_CAP_FILE_BUFFER)) ||
|
|
mapping_mapped(inode->i_mapping) ||
|
|
__ceph_is_file_opened(ci)) {
|
|
ci->i_truncate_pending++;
|
|
queue_trunc = 1;
|
|
}
|
|
}
|
|
}
|
|
if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 &&
|
|
ci->i_truncate_size != truncate_size) {
|
|
dout("truncate_size %lld -> %llu\n", ci->i_truncate_size,
|
|
truncate_size);
|
|
ci->i_truncate_size = truncate_size;
|
|
}
|
|
|
|
if (queue_trunc)
|
|
ceph_fscache_invalidate(inode);
|
|
|
|
return queue_trunc;
|
|
}
|
|
|
|
void ceph_fill_file_time(struct inode *inode, int issued,
|
|
u64 time_warp_seq, struct timespec64 *ctime,
|
|
struct timespec64 *mtime, struct timespec64 *atime)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int warn = 0;
|
|
|
|
if (issued & (CEPH_CAP_FILE_EXCL|
|
|
CEPH_CAP_FILE_WR|
|
|
CEPH_CAP_FILE_BUFFER|
|
|
CEPH_CAP_AUTH_EXCL|
|
|
CEPH_CAP_XATTR_EXCL)) {
|
|
if (ci->i_version == 0 ||
|
|
timespec64_compare(ctime, &inode->i_ctime) > 0) {
|
|
dout("ctime %lld.%09ld -> %lld.%09ld inc w/ cap\n",
|
|
inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
|
|
ctime->tv_sec, ctime->tv_nsec);
|
|
inode->i_ctime = *ctime;
|
|
}
|
|
if (ci->i_version == 0 ||
|
|
ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) {
|
|
/* the MDS did a utimes() */
|
|
dout("mtime %lld.%09ld -> %lld.%09ld "
|
|
"tw %d -> %d\n",
|
|
inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
|
|
mtime->tv_sec, mtime->tv_nsec,
|
|
ci->i_time_warp_seq, (int)time_warp_seq);
|
|
|
|
inode->i_mtime = *mtime;
|
|
inode->i_atime = *atime;
|
|
ci->i_time_warp_seq = time_warp_seq;
|
|
} else if (time_warp_seq == ci->i_time_warp_seq) {
|
|
/* nobody did utimes(); take the max */
|
|
if (timespec64_compare(mtime, &inode->i_mtime) > 0) {
|
|
dout("mtime %lld.%09ld -> %lld.%09ld inc\n",
|
|
inode->i_mtime.tv_sec,
|
|
inode->i_mtime.tv_nsec,
|
|
mtime->tv_sec, mtime->tv_nsec);
|
|
inode->i_mtime = *mtime;
|
|
}
|
|
if (timespec64_compare(atime, &inode->i_atime) > 0) {
|
|
dout("atime %lld.%09ld -> %lld.%09ld inc\n",
|
|
inode->i_atime.tv_sec,
|
|
inode->i_atime.tv_nsec,
|
|
atime->tv_sec, atime->tv_nsec);
|
|
inode->i_atime = *atime;
|
|
}
|
|
} else if (issued & CEPH_CAP_FILE_EXCL) {
|
|
/* we did a utimes(); ignore mds values */
|
|
} else {
|
|
warn = 1;
|
|
}
|
|
} else {
|
|
/* we have no write|excl caps; whatever the MDS says is true */
|
|
if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) {
|
|
inode->i_ctime = *ctime;
|
|
inode->i_mtime = *mtime;
|
|
inode->i_atime = *atime;
|
|
ci->i_time_warp_seq = time_warp_seq;
|
|
} else {
|
|
warn = 1;
|
|
}
|
|
}
|
|
if (warn) /* time_warp_seq shouldn't go backwards */
|
|
dout("%p mds time_warp_seq %llu < %u\n",
|
|
inode, time_warp_seq, ci->i_time_warp_seq);
|
|
}
|
|
|
|
/*
|
|
* Populate an inode based on info from mds. May be called on new or
|
|
* existing inodes.
|
|
*/
|
|
int ceph_fill_inode(struct inode *inode, struct page *locked_page,
|
|
struct ceph_mds_reply_info_in *iinfo,
|
|
struct ceph_mds_reply_dirfrag *dirinfo,
|
|
struct ceph_mds_session *session, int cap_fmode,
|
|
struct ceph_cap_reservation *caps_reservation)
|
|
{
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
|
|
struct ceph_mds_reply_inode *info = iinfo->in;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int issued, new_issued, info_caps;
|
|
struct timespec64 mtime, atime, ctime;
|
|
struct ceph_buffer *xattr_blob = NULL;
|
|
struct ceph_buffer *old_blob = NULL;
|
|
struct ceph_string *pool_ns = NULL;
|
|
struct ceph_cap *new_cap = NULL;
|
|
int err = 0;
|
|
bool wake = false;
|
|
bool queue_trunc = false;
|
|
bool new_version = false;
|
|
bool fill_inline = false;
|
|
|
|
dout("%s %p ino %llx.%llx v %llu had %llu\n", __func__,
|
|
inode, ceph_vinop(inode), le64_to_cpu(info->version),
|
|
ci->i_version);
|
|
|
|
info_caps = le32_to_cpu(info->cap.caps);
|
|
|
|
/* prealloc new cap struct */
|
|
if (info_caps && ceph_snap(inode) == CEPH_NOSNAP) {
|
|
new_cap = ceph_get_cap(mdsc, caps_reservation);
|
|
if (!new_cap)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/*
|
|
* prealloc xattr data, if it looks like we'll need it. only
|
|
* if len > 4 (meaning there are actually xattrs; the first 4
|
|
* bytes are the xattr count).
|
|
*/
|
|
if (iinfo->xattr_len > 4) {
|
|
xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
|
|
if (!xattr_blob)
|
|
pr_err("%s ENOMEM xattr blob %d bytes\n", __func__,
|
|
iinfo->xattr_len);
|
|
}
|
|
|
|
if (iinfo->pool_ns_len > 0)
|
|
pool_ns = ceph_find_or_create_string(iinfo->pool_ns_data,
|
|
iinfo->pool_ns_len);
|
|
|
|
if (ceph_snap(inode) != CEPH_NOSNAP && !ci->i_snapid_map)
|
|
ci->i_snapid_map = ceph_get_snapid_map(mdsc, ceph_snap(inode));
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
|
|
/*
|
|
* provided version will be odd if inode value is projected,
|
|
* even if stable. skip the update if we have newer stable
|
|
* info (ours>=theirs, e.g. due to racing mds replies), unless
|
|
* we are getting projected (unstable) info (in which case the
|
|
* version is odd, and we want ours>theirs).
|
|
* us them
|
|
* 2 2 skip
|
|
* 3 2 skip
|
|
* 3 3 update
|
|
*/
|
|
if (ci->i_version == 0 ||
|
|
((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
|
|
le64_to_cpu(info->version) > (ci->i_version & ~1)))
|
|
new_version = true;
|
|
|
|
/* Update change_attribute */
|
|
inode_set_max_iversion_raw(inode, iinfo->change_attr);
|
|
|
|
__ceph_caps_issued(ci, &issued);
|
|
issued |= __ceph_caps_dirty(ci);
|
|
new_issued = ~issued & info_caps;
|
|
|
|
/* update inode */
|
|
inode->i_rdev = le32_to_cpu(info->rdev);
|
|
/* directories have fl_stripe_unit set to zero */
|
|
if (le32_to_cpu(info->layout.fl_stripe_unit))
|
|
inode->i_blkbits =
|
|
fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1;
|
|
else
|
|
inode->i_blkbits = CEPH_BLOCK_SHIFT;
|
|
|
|
__ceph_update_quota(ci, iinfo->max_bytes, iinfo->max_files);
|
|
|
|
if ((new_version || (new_issued & CEPH_CAP_AUTH_SHARED)) &&
|
|
(issued & CEPH_CAP_AUTH_EXCL) == 0) {
|
|
inode->i_mode = le32_to_cpu(info->mode);
|
|
inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid));
|
|
inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid));
|
|
dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode,
|
|
from_kuid(&init_user_ns, inode->i_uid),
|
|
from_kgid(&init_user_ns, inode->i_gid));
|
|
ceph_decode_timespec64(&ci->i_btime, &iinfo->btime);
|
|
ceph_decode_timespec64(&ci->i_snap_btime, &iinfo->snap_btime);
|
|
}
|
|
|
|
if ((new_version || (new_issued & CEPH_CAP_LINK_SHARED)) &&
|
|
(issued & CEPH_CAP_LINK_EXCL) == 0)
|
|
set_nlink(inode, le32_to_cpu(info->nlink));
|
|
|
|
if (new_version || (new_issued & CEPH_CAP_ANY_RD)) {
|
|
/* be careful with mtime, atime, size */
|
|
ceph_decode_timespec64(&atime, &info->atime);
|
|
ceph_decode_timespec64(&mtime, &info->mtime);
|
|
ceph_decode_timespec64(&ctime, &info->ctime);
|
|
ceph_fill_file_time(inode, issued,
|
|
le32_to_cpu(info->time_warp_seq),
|
|
&ctime, &mtime, &atime);
|
|
}
|
|
|
|
if (new_version || (info_caps & CEPH_CAP_FILE_SHARED)) {
|
|
ci->i_files = le64_to_cpu(info->files);
|
|
ci->i_subdirs = le64_to_cpu(info->subdirs);
|
|
}
|
|
|
|
if (new_version ||
|
|
(new_issued & (CEPH_CAP_ANY_FILE_RD | CEPH_CAP_ANY_FILE_WR))) {
|
|
s64 old_pool = ci->i_layout.pool_id;
|
|
struct ceph_string *old_ns;
|
|
|
|
ceph_file_layout_from_legacy(&ci->i_layout, &info->layout);
|
|
old_ns = rcu_dereference_protected(ci->i_layout.pool_ns,
|
|
lockdep_is_held(&ci->i_ceph_lock));
|
|
rcu_assign_pointer(ci->i_layout.pool_ns, pool_ns);
|
|
|
|
if (ci->i_layout.pool_id != old_pool || pool_ns != old_ns)
|
|
ci->i_ceph_flags &= ~CEPH_I_POOL_PERM;
|
|
|
|
pool_ns = old_ns;
|
|
|
|
queue_trunc = ceph_fill_file_size(inode, issued,
|
|
le32_to_cpu(info->truncate_seq),
|
|
le64_to_cpu(info->truncate_size),
|
|
le64_to_cpu(info->size));
|
|
/* only update max_size on auth cap */
|
|
if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) &&
|
|
ci->i_max_size != le64_to_cpu(info->max_size)) {
|
|
dout("max_size %lld -> %llu\n", ci->i_max_size,
|
|
le64_to_cpu(info->max_size));
|
|
ci->i_max_size = le64_to_cpu(info->max_size);
|
|
}
|
|
}
|
|
|
|
/* layout and rstat are not tracked by capability, update them if
|
|
* the inode info is from auth mds */
|
|
if (new_version || (info->cap.flags & CEPH_CAP_FLAG_AUTH)) {
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
ci->i_dir_layout = iinfo->dir_layout;
|
|
ci->i_rbytes = le64_to_cpu(info->rbytes);
|
|
ci->i_rfiles = le64_to_cpu(info->rfiles);
|
|
ci->i_rsubdirs = le64_to_cpu(info->rsubdirs);
|
|
ci->i_dir_pin = iinfo->dir_pin;
|
|
ceph_decode_timespec64(&ci->i_rctime, &info->rctime);
|
|
}
|
|
}
|
|
|
|
/* xattrs */
|
|
/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
|
|
if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
|
|
le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
|
|
if (ci->i_xattrs.blob)
|
|
old_blob = ci->i_xattrs.blob;
|
|
ci->i_xattrs.blob = xattr_blob;
|
|
if (xattr_blob)
|
|
memcpy(ci->i_xattrs.blob->vec.iov_base,
|
|
iinfo->xattr_data, iinfo->xattr_len);
|
|
ci->i_xattrs.version = le64_to_cpu(info->xattr_version);
|
|
ceph_forget_all_cached_acls(inode);
|
|
ceph_security_invalidate_secctx(inode);
|
|
xattr_blob = NULL;
|
|
}
|
|
|
|
/* finally update i_version */
|
|
if (le64_to_cpu(info->version) > ci->i_version)
|
|
ci->i_version = le64_to_cpu(info->version);
|
|
|
|
inode->i_mapping->a_ops = &ceph_aops;
|
|
|
|
switch (inode->i_mode & S_IFMT) {
|
|
case S_IFIFO:
|
|
case S_IFBLK:
|
|
case S_IFCHR:
|
|
case S_IFSOCK:
|
|
inode->i_blkbits = PAGE_SHIFT;
|
|
init_special_inode(inode, inode->i_mode, inode->i_rdev);
|
|
inode->i_op = &ceph_file_iops;
|
|
break;
|
|
case S_IFREG:
|
|
inode->i_op = &ceph_file_iops;
|
|
inode->i_fop = &ceph_file_fops;
|
|
break;
|
|
case S_IFLNK:
|
|
inode->i_op = &ceph_symlink_iops;
|
|
if (!ci->i_symlink) {
|
|
u32 symlen = iinfo->symlink_len;
|
|
char *sym;
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (symlen != i_size_read(inode)) {
|
|
pr_err("%s %llx.%llx BAD symlink "
|
|
"size %lld\n", __func__,
|
|
ceph_vinop(inode),
|
|
i_size_read(inode));
|
|
i_size_write(inode, symlen);
|
|
inode->i_blocks = calc_inode_blocks(symlen);
|
|
}
|
|
|
|
err = -ENOMEM;
|
|
sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS);
|
|
if (!sym)
|
|
goto out;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (!ci->i_symlink)
|
|
ci->i_symlink = sym;
|
|
else
|
|
kfree(sym); /* lost a race */
|
|
}
|
|
inode->i_link = ci->i_symlink;
|
|
break;
|
|
case S_IFDIR:
|
|
inode->i_op = &ceph_dir_iops;
|
|
inode->i_fop = &ceph_dir_fops;
|
|
break;
|
|
default:
|
|
pr_err("%s %llx.%llx BAD mode 0%o\n", __func__,
|
|
ceph_vinop(inode), inode->i_mode);
|
|
}
|
|
|
|
/* were we issued a capability? */
|
|
if (info_caps) {
|
|
if (ceph_snap(inode) == CEPH_NOSNAP) {
|
|
ceph_add_cap(inode, session,
|
|
le64_to_cpu(info->cap.cap_id),
|
|
info_caps,
|
|
le32_to_cpu(info->cap.wanted),
|
|
le32_to_cpu(info->cap.seq),
|
|
le32_to_cpu(info->cap.mseq),
|
|
le64_to_cpu(info->cap.realm),
|
|
info->cap.flags, &new_cap);
|
|
|
|
/* set dir completion flag? */
|
|
if (S_ISDIR(inode->i_mode) &&
|
|
ci->i_files == 0 && ci->i_subdirs == 0 &&
|
|
(info_caps & CEPH_CAP_FILE_SHARED) &&
|
|
(issued & CEPH_CAP_FILE_EXCL) == 0 &&
|
|
!__ceph_dir_is_complete(ci)) {
|
|
dout(" marking %p complete (empty)\n", inode);
|
|
i_size_write(inode, 0);
|
|
__ceph_dir_set_complete(ci,
|
|
atomic64_read(&ci->i_release_count),
|
|
atomic64_read(&ci->i_ordered_count));
|
|
}
|
|
|
|
wake = true;
|
|
} else {
|
|
dout(" %p got snap_caps %s\n", inode,
|
|
ceph_cap_string(info_caps));
|
|
ci->i_snap_caps |= info_caps;
|
|
}
|
|
}
|
|
|
|
if (iinfo->inline_version > 0 &&
|
|
iinfo->inline_version >= ci->i_inline_version) {
|
|
int cache_caps = CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_LAZYIO;
|
|
ci->i_inline_version = iinfo->inline_version;
|
|
if (ci->i_inline_version != CEPH_INLINE_NONE &&
|
|
(locked_page || (info_caps & cache_caps)))
|
|
fill_inline = true;
|
|
}
|
|
|
|
if (cap_fmode >= 0) {
|
|
if (!info_caps)
|
|
pr_warn("mds issued no caps on %llx.%llx\n",
|
|
ceph_vinop(inode));
|
|
__ceph_touch_fmode(ci, mdsc, cap_fmode);
|
|
}
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (fill_inline)
|
|
ceph_fill_inline_data(inode, locked_page,
|
|
iinfo->inline_data, iinfo->inline_len);
|
|
|
|
if (wake)
|
|
wake_up_all(&ci->i_cap_wq);
|
|
|
|
/* queue truncate if we saw i_size decrease */
|
|
if (queue_trunc)
|
|
ceph_queue_vmtruncate(inode);
|
|
|
|
/* populate frag tree */
|
|
if (S_ISDIR(inode->i_mode))
|
|
ceph_fill_fragtree(inode, &info->fragtree, dirinfo);
|
|
|
|
/* update delegation info? */
|
|
if (dirinfo)
|
|
ceph_fill_dirfrag(inode, dirinfo);
|
|
|
|
err = 0;
|
|
out:
|
|
if (new_cap)
|
|
ceph_put_cap(mdsc, new_cap);
|
|
ceph_buffer_put(old_blob);
|
|
ceph_buffer_put(xattr_blob);
|
|
ceph_put_string(pool_ns);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* caller should hold session s_mutex and dentry->d_lock.
|
|
*/
|
|
static void __update_dentry_lease(struct inode *dir, struct dentry *dentry,
|
|
struct ceph_mds_reply_lease *lease,
|
|
struct ceph_mds_session *session,
|
|
unsigned long from_time,
|
|
struct ceph_mds_session **old_lease_session)
|
|
{
|
|
struct ceph_dentry_info *di = ceph_dentry(dentry);
|
|
unsigned mask = le16_to_cpu(lease->mask);
|
|
long unsigned duration = le32_to_cpu(lease->duration_ms);
|
|
long unsigned ttl = from_time + (duration * HZ) / 1000;
|
|
long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000;
|
|
|
|
dout("update_dentry_lease %p duration %lu ms ttl %lu\n",
|
|
dentry, duration, ttl);
|
|
|
|
/* only track leases on regular dentries */
|
|
if (ceph_snap(dir) != CEPH_NOSNAP)
|
|
return;
|
|
|
|
if (mask & CEPH_LEASE_PRIMARY_LINK)
|
|
di->flags |= CEPH_DENTRY_PRIMARY_LINK;
|
|
else
|
|
di->flags &= ~CEPH_DENTRY_PRIMARY_LINK;
|
|
|
|
di->lease_shared_gen = atomic_read(&ceph_inode(dir)->i_shared_gen);
|
|
if (!(mask & CEPH_LEASE_VALID)) {
|
|
__ceph_dentry_dir_lease_touch(di);
|
|
return;
|
|
}
|
|
|
|
if (di->lease_gen == session->s_cap_gen &&
|
|
time_before(ttl, di->time))
|
|
return; /* we already have a newer lease. */
|
|
|
|
if (di->lease_session && di->lease_session != session) {
|
|
*old_lease_session = di->lease_session;
|
|
di->lease_session = NULL;
|
|
}
|
|
|
|
if (!di->lease_session)
|
|
di->lease_session = ceph_get_mds_session(session);
|
|
di->lease_gen = session->s_cap_gen;
|
|
di->lease_seq = le32_to_cpu(lease->seq);
|
|
di->lease_renew_after = half_ttl;
|
|
di->lease_renew_from = 0;
|
|
di->time = ttl;
|
|
|
|
__ceph_dentry_lease_touch(di);
|
|
}
|
|
|
|
static inline void update_dentry_lease(struct inode *dir, struct dentry *dentry,
|
|
struct ceph_mds_reply_lease *lease,
|
|
struct ceph_mds_session *session,
|
|
unsigned long from_time)
|
|
{
|
|
struct ceph_mds_session *old_lease_session = NULL;
|
|
spin_lock(&dentry->d_lock);
|
|
__update_dentry_lease(dir, dentry, lease, session, from_time,
|
|
&old_lease_session);
|
|
spin_unlock(&dentry->d_lock);
|
|
if (old_lease_session)
|
|
ceph_put_mds_session(old_lease_session);
|
|
}
|
|
|
|
/*
|
|
* update dentry lease without having parent inode locked
|
|
*/
|
|
static void update_dentry_lease_careful(struct dentry *dentry,
|
|
struct ceph_mds_reply_lease *lease,
|
|
struct ceph_mds_session *session,
|
|
unsigned long from_time,
|
|
char *dname, u32 dname_len,
|
|
struct ceph_vino *pdvino,
|
|
struct ceph_vino *ptvino)
|
|
|
|
{
|
|
struct inode *dir;
|
|
struct ceph_mds_session *old_lease_session = NULL;
|
|
|
|
spin_lock(&dentry->d_lock);
|
|
/* make sure dentry's name matches target */
|
|
if (dentry->d_name.len != dname_len ||
|
|
memcmp(dentry->d_name.name, dname, dname_len))
|
|
goto out_unlock;
|
|
|
|
dir = d_inode(dentry->d_parent);
|
|
/* make sure parent matches dvino */
|
|
if (!ceph_ino_compare(dir, pdvino))
|
|
goto out_unlock;
|
|
|
|
/* make sure dentry's inode matches target. NULL ptvino means that
|
|
* we expect a negative dentry */
|
|
if (ptvino) {
|
|
if (d_really_is_negative(dentry))
|
|
goto out_unlock;
|
|
if (!ceph_ino_compare(d_inode(dentry), ptvino))
|
|
goto out_unlock;
|
|
} else {
|
|
if (d_really_is_positive(dentry))
|
|
goto out_unlock;
|
|
}
|
|
|
|
__update_dentry_lease(dir, dentry, lease, session,
|
|
from_time, &old_lease_session);
|
|
out_unlock:
|
|
spin_unlock(&dentry->d_lock);
|
|
if (old_lease_session)
|
|
ceph_put_mds_session(old_lease_session);
|
|
}
|
|
|
|
/*
|
|
* splice a dentry to an inode.
|
|
* caller must hold directory i_mutex for this to be safe.
|
|
*/
|
|
static int splice_dentry(struct dentry **pdn, struct inode *in)
|
|
{
|
|
struct dentry *dn = *pdn;
|
|
struct dentry *realdn;
|
|
|
|
BUG_ON(d_inode(dn));
|
|
|
|
if (S_ISDIR(in->i_mode)) {
|
|
/* If inode is directory, d_splice_alias() below will remove
|
|
* 'realdn' from its origin parent. We need to ensure that
|
|
* origin parent's readdir cache will not reference 'realdn'
|
|
*/
|
|
realdn = d_find_any_alias(in);
|
|
if (realdn) {
|
|
struct ceph_dentry_info *di = ceph_dentry(realdn);
|
|
spin_lock(&realdn->d_lock);
|
|
|
|
realdn->d_op->d_prune(realdn);
|
|
|
|
di->time = jiffies;
|
|
di->lease_shared_gen = 0;
|
|
di->offset = 0;
|
|
|
|
spin_unlock(&realdn->d_lock);
|
|
dput(realdn);
|
|
}
|
|
}
|
|
|
|
/* dn must be unhashed */
|
|
if (!d_unhashed(dn))
|
|
d_drop(dn);
|
|
realdn = d_splice_alias(in, dn);
|
|
if (IS_ERR(realdn)) {
|
|
pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n",
|
|
PTR_ERR(realdn), dn, in, ceph_vinop(in));
|
|
return PTR_ERR(realdn);
|
|
}
|
|
|
|
if (realdn) {
|
|
dout("dn %p (%d) spliced with %p (%d) "
|
|
"inode %p ino %llx.%llx\n",
|
|
dn, d_count(dn),
|
|
realdn, d_count(realdn),
|
|
d_inode(realdn), ceph_vinop(d_inode(realdn)));
|
|
dput(dn);
|
|
*pdn = realdn;
|
|
} else {
|
|
BUG_ON(!ceph_dentry(dn));
|
|
dout("dn %p attached to %p ino %llx.%llx\n",
|
|
dn, d_inode(dn), ceph_vinop(d_inode(dn)));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Incorporate results into the local cache. This is either just
|
|
* one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
|
|
* after a lookup).
|
|
*
|
|
* A reply may contain
|
|
* a directory inode along with a dentry.
|
|
* and/or a target inode
|
|
*
|
|
* Called with snap_rwsem (read).
|
|
*/
|
|
int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req)
|
|
{
|
|
struct ceph_mds_session *session = req->r_session;
|
|
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
|
|
struct inode *in = NULL;
|
|
struct ceph_vino tvino, dvino;
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
|
|
int err = 0;
|
|
|
|
dout("fill_trace %p is_dentry %d is_target %d\n", req,
|
|
rinfo->head->is_dentry, rinfo->head->is_target);
|
|
|
|
if (!rinfo->head->is_target && !rinfo->head->is_dentry) {
|
|
dout("fill_trace reply is empty!\n");
|
|
if (rinfo->head->result == 0 && req->r_parent)
|
|
ceph_invalidate_dir_request(req);
|
|
return 0;
|
|
}
|
|
|
|
if (rinfo->head->is_dentry) {
|
|
struct inode *dir = req->r_parent;
|
|
|
|
if (dir) {
|
|
err = ceph_fill_inode(dir, NULL, &rinfo->diri,
|
|
rinfo->dirfrag, session, -1,
|
|
&req->r_caps_reservation);
|
|
if (err < 0)
|
|
goto done;
|
|
} else {
|
|
WARN_ON_ONCE(1);
|
|
}
|
|
|
|
if (dir && req->r_op == CEPH_MDS_OP_LOOKUPNAME &&
|
|
test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
|
|
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
|
|
struct qstr dname;
|
|
struct dentry *dn, *parent;
|
|
|
|
BUG_ON(!rinfo->head->is_target);
|
|
BUG_ON(req->r_dentry);
|
|
|
|
parent = d_find_any_alias(dir);
|
|
BUG_ON(!parent);
|
|
|
|
dname.name = rinfo->dname;
|
|
dname.len = rinfo->dname_len;
|
|
dname.hash = full_name_hash(parent, dname.name, dname.len);
|
|
tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
|
|
tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
|
|
retry_lookup:
|
|
dn = d_lookup(parent, &dname);
|
|
dout("d_lookup on parent=%p name=%.*s got %p\n",
|
|
parent, dname.len, dname.name, dn);
|
|
|
|
if (!dn) {
|
|
dn = d_alloc(parent, &dname);
|
|
dout("d_alloc %p '%.*s' = %p\n", parent,
|
|
dname.len, dname.name, dn);
|
|
if (!dn) {
|
|
dput(parent);
|
|
err = -ENOMEM;
|
|
goto done;
|
|
}
|
|
err = 0;
|
|
} else if (d_really_is_positive(dn) &&
|
|
(ceph_ino(d_inode(dn)) != tvino.ino ||
|
|
ceph_snap(d_inode(dn)) != tvino.snap)) {
|
|
dout(" dn %p points to wrong inode %p\n",
|
|
dn, d_inode(dn));
|
|
ceph_dir_clear_ordered(dir);
|
|
d_delete(dn);
|
|
dput(dn);
|
|
goto retry_lookup;
|
|
}
|
|
|
|
req->r_dentry = dn;
|
|
dput(parent);
|
|
}
|
|
}
|
|
|
|
if (rinfo->head->is_target) {
|
|
/* Should be filled in by handle_reply */
|
|
BUG_ON(!req->r_target_inode);
|
|
|
|
in = req->r_target_inode;
|
|
err = ceph_fill_inode(in, req->r_locked_page, &rinfo->targeti,
|
|
NULL, session,
|
|
(!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
|
|
!test_bit(CEPH_MDS_R_ASYNC, &req->r_req_flags) &&
|
|
rinfo->head->result == 0) ? req->r_fmode : -1,
|
|
&req->r_caps_reservation);
|
|
if (err < 0) {
|
|
pr_err("ceph_fill_inode badness %p %llx.%llx\n",
|
|
in, ceph_vinop(in));
|
|
req->r_target_inode = NULL;
|
|
if (in->i_state & I_NEW)
|
|
discard_new_inode(in);
|
|
else
|
|
iput(in);
|
|
goto done;
|
|
}
|
|
if (in->i_state & I_NEW)
|
|
unlock_new_inode(in);
|
|
}
|
|
|
|
/*
|
|
* ignore null lease/binding on snapdir ENOENT, or else we
|
|
* will have trouble splicing in the virtual snapdir later
|
|
*/
|
|
if (rinfo->head->is_dentry &&
|
|
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags) &&
|
|
test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
|
|
(rinfo->head->is_target || strncmp(req->r_dentry->d_name.name,
|
|
fsc->mount_options->snapdir_name,
|
|
req->r_dentry->d_name.len))) {
|
|
/*
|
|
* lookup link rename : null -> possibly existing inode
|
|
* mknod symlink mkdir : null -> new inode
|
|
* unlink : linked -> null
|
|
*/
|
|
struct inode *dir = req->r_parent;
|
|
struct dentry *dn = req->r_dentry;
|
|
bool have_dir_cap, have_lease;
|
|
|
|
BUG_ON(!dn);
|
|
BUG_ON(!dir);
|
|
BUG_ON(d_inode(dn->d_parent) != dir);
|
|
|
|
dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
|
|
dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
|
|
|
|
BUG_ON(ceph_ino(dir) != dvino.ino);
|
|
BUG_ON(ceph_snap(dir) != dvino.snap);
|
|
|
|
/* do we have a lease on the whole dir? */
|
|
have_dir_cap =
|
|
(le32_to_cpu(rinfo->diri.in->cap.caps) &
|
|
CEPH_CAP_FILE_SHARED);
|
|
|
|
/* do we have a dn lease? */
|
|
have_lease = have_dir_cap ||
|
|
le32_to_cpu(rinfo->dlease->duration_ms);
|
|
if (!have_lease)
|
|
dout("fill_trace no dentry lease or dir cap\n");
|
|
|
|
/* rename? */
|
|
if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) {
|
|
struct inode *olddir = req->r_old_dentry_dir;
|
|
BUG_ON(!olddir);
|
|
|
|
dout(" src %p '%pd' dst %p '%pd'\n",
|
|
req->r_old_dentry,
|
|
req->r_old_dentry,
|
|
dn, dn);
|
|
dout("fill_trace doing d_move %p -> %p\n",
|
|
req->r_old_dentry, dn);
|
|
|
|
/* d_move screws up sibling dentries' offsets */
|
|
ceph_dir_clear_ordered(dir);
|
|
ceph_dir_clear_ordered(olddir);
|
|
|
|
d_move(req->r_old_dentry, dn);
|
|
dout(" src %p '%pd' dst %p '%pd'\n",
|
|
req->r_old_dentry,
|
|
req->r_old_dentry,
|
|
dn, dn);
|
|
|
|
/* ensure target dentry is invalidated, despite
|
|
rehashing bug in vfs_rename_dir */
|
|
ceph_invalidate_dentry_lease(dn);
|
|
|
|
dout("dn %p gets new offset %lld\n", req->r_old_dentry,
|
|
ceph_dentry(req->r_old_dentry)->offset);
|
|
|
|
/* swap r_dentry and r_old_dentry in case that
|
|
* splice_dentry() gets called later. This is safe
|
|
* because no other place will use them */
|
|
req->r_dentry = req->r_old_dentry;
|
|
req->r_old_dentry = dn;
|
|
dn = req->r_dentry;
|
|
}
|
|
|
|
/* null dentry? */
|
|
if (!rinfo->head->is_target) {
|
|
dout("fill_trace null dentry\n");
|
|
if (d_really_is_positive(dn)) {
|
|
dout("d_delete %p\n", dn);
|
|
ceph_dir_clear_ordered(dir);
|
|
d_delete(dn);
|
|
} else if (have_lease) {
|
|
if (d_unhashed(dn))
|
|
d_add(dn, NULL);
|
|
update_dentry_lease(dir, dn,
|
|
rinfo->dlease, session,
|
|
req->r_request_started);
|
|
}
|
|
goto done;
|
|
}
|
|
|
|
/* attach proper inode */
|
|
if (d_really_is_negative(dn)) {
|
|
ceph_dir_clear_ordered(dir);
|
|
ihold(in);
|
|
err = splice_dentry(&req->r_dentry, in);
|
|
if (err < 0)
|
|
goto done;
|
|
dn = req->r_dentry; /* may have spliced */
|
|
} else if (d_really_is_positive(dn) && d_inode(dn) != in) {
|
|
dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
|
|
dn, d_inode(dn), ceph_vinop(d_inode(dn)),
|
|
ceph_vinop(in));
|
|
d_invalidate(dn);
|
|
have_lease = false;
|
|
}
|
|
|
|
if (have_lease) {
|
|
update_dentry_lease(dir, dn,
|
|
rinfo->dlease, session,
|
|
req->r_request_started);
|
|
}
|
|
dout(" final dn %p\n", dn);
|
|
} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
|
|
req->r_op == CEPH_MDS_OP_MKSNAP) &&
|
|
test_bit(CEPH_MDS_R_PARENT_LOCKED, &req->r_req_flags) &&
|
|
!test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags)) {
|
|
struct inode *dir = req->r_parent;
|
|
|
|
/* fill out a snapdir LOOKUPSNAP dentry */
|
|
BUG_ON(!dir);
|
|
BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
|
|
BUG_ON(!req->r_dentry);
|
|
dout(" linking snapped dir %p to dn %p\n", in, req->r_dentry);
|
|
ceph_dir_clear_ordered(dir);
|
|
ihold(in);
|
|
err = splice_dentry(&req->r_dentry, in);
|
|
if (err < 0)
|
|
goto done;
|
|
} else if (rinfo->head->is_dentry && req->r_dentry) {
|
|
/* parent inode is not locked, be carefull */
|
|
struct ceph_vino *ptvino = NULL;
|
|
dvino.ino = le64_to_cpu(rinfo->diri.in->ino);
|
|
dvino.snap = le64_to_cpu(rinfo->diri.in->snapid);
|
|
if (rinfo->head->is_target) {
|
|
tvino.ino = le64_to_cpu(rinfo->targeti.in->ino);
|
|
tvino.snap = le64_to_cpu(rinfo->targeti.in->snapid);
|
|
ptvino = &tvino;
|
|
}
|
|
update_dentry_lease_careful(req->r_dentry, rinfo->dlease,
|
|
session, req->r_request_started,
|
|
rinfo->dname, rinfo->dname_len,
|
|
&dvino, ptvino);
|
|
}
|
|
done:
|
|
dout("fill_trace done err=%d\n", err);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Prepopulate our cache with readdir results, leases, etc.
|
|
*/
|
|
static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
|
|
int i, err = 0;
|
|
|
|
for (i = 0; i < rinfo->dir_nr; i++) {
|
|
struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
|
|
struct ceph_vino vino;
|
|
struct inode *in;
|
|
int rc;
|
|
|
|
vino.ino = le64_to_cpu(rde->inode.in->ino);
|
|
vino.snap = le64_to_cpu(rde->inode.in->snapid);
|
|
|
|
in = ceph_get_inode(req->r_dentry->d_sb, vino);
|
|
if (IS_ERR(in)) {
|
|
err = PTR_ERR(in);
|
|
dout("new_inode badness got %d\n", err);
|
|
continue;
|
|
}
|
|
rc = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
|
|
-1, &req->r_caps_reservation);
|
|
if (rc < 0) {
|
|
pr_err("ceph_fill_inode badness on %p got %d\n",
|
|
in, rc);
|
|
err = rc;
|
|
if (in->i_state & I_NEW) {
|
|
ihold(in);
|
|
discard_new_inode(in);
|
|
}
|
|
} else if (in->i_state & I_NEW) {
|
|
unlock_new_inode(in);
|
|
}
|
|
|
|
/* avoid calling iput_final() in mds dispatch threads */
|
|
ceph_async_iput(in);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl)
|
|
{
|
|
if (ctl->page) {
|
|
kunmap(ctl->page);
|
|
put_page(ctl->page);
|
|
ctl->page = NULL;
|
|
}
|
|
}
|
|
|
|
static int fill_readdir_cache(struct inode *dir, struct dentry *dn,
|
|
struct ceph_readdir_cache_control *ctl,
|
|
struct ceph_mds_request *req)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(dir);
|
|
unsigned nsize = PAGE_SIZE / sizeof(struct dentry*);
|
|
unsigned idx = ctl->index % nsize;
|
|
pgoff_t pgoff = ctl->index / nsize;
|
|
|
|
if (!ctl->page || pgoff != page_index(ctl->page)) {
|
|
ceph_readdir_cache_release(ctl);
|
|
if (idx == 0)
|
|
ctl->page = grab_cache_page(&dir->i_data, pgoff);
|
|
else
|
|
ctl->page = find_lock_page(&dir->i_data, pgoff);
|
|
if (!ctl->page) {
|
|
ctl->index = -1;
|
|
return idx == 0 ? -ENOMEM : 0;
|
|
}
|
|
/* reading/filling the cache are serialized by
|
|
* i_mutex, no need to use page lock */
|
|
unlock_page(ctl->page);
|
|
ctl->dentries = kmap(ctl->page);
|
|
if (idx == 0)
|
|
memset(ctl->dentries, 0, PAGE_SIZE);
|
|
}
|
|
|
|
if (req->r_dir_release_cnt == atomic64_read(&ci->i_release_count) &&
|
|
req->r_dir_ordered_cnt == atomic64_read(&ci->i_ordered_count)) {
|
|
dout("readdir cache dn %p idx %d\n", dn, ctl->index);
|
|
ctl->dentries[idx] = dn;
|
|
ctl->index++;
|
|
} else {
|
|
dout("disable readdir cache\n");
|
|
ctl->index = -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ceph_readdir_prepopulate(struct ceph_mds_request *req,
|
|
struct ceph_mds_session *session)
|
|
{
|
|
struct dentry *parent = req->r_dentry;
|
|
struct ceph_inode_info *ci = ceph_inode(d_inode(parent));
|
|
struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info;
|
|
struct qstr dname;
|
|
struct dentry *dn;
|
|
struct inode *in;
|
|
int err = 0, skipped = 0, ret, i;
|
|
u32 frag = le32_to_cpu(req->r_args.readdir.frag);
|
|
u32 last_hash = 0;
|
|
u32 fpos_offset;
|
|
struct ceph_readdir_cache_control cache_ctl = {};
|
|
|
|
if (test_bit(CEPH_MDS_R_ABORTED, &req->r_req_flags))
|
|
return readdir_prepopulate_inodes_only(req, session);
|
|
|
|
if (rinfo->hash_order) {
|
|
if (req->r_path2) {
|
|
last_hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
|
|
req->r_path2,
|
|
strlen(req->r_path2));
|
|
last_hash = ceph_frag_value(last_hash);
|
|
} else if (rinfo->offset_hash) {
|
|
/* mds understands offset_hash */
|
|
WARN_ON_ONCE(req->r_readdir_offset != 2);
|
|
last_hash = le32_to_cpu(req->r_args.readdir.offset_hash);
|
|
}
|
|
}
|
|
|
|
if (rinfo->dir_dir &&
|
|
le32_to_cpu(rinfo->dir_dir->frag) != frag) {
|
|
dout("readdir_prepopulate got new frag %x -> %x\n",
|
|
frag, le32_to_cpu(rinfo->dir_dir->frag));
|
|
frag = le32_to_cpu(rinfo->dir_dir->frag);
|
|
if (!rinfo->hash_order)
|
|
req->r_readdir_offset = 2;
|
|
}
|
|
|
|
if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) {
|
|
dout("readdir_prepopulate %d items under SNAPDIR dn %p\n",
|
|
rinfo->dir_nr, parent);
|
|
} else {
|
|
dout("readdir_prepopulate %d items under dn %p\n",
|
|
rinfo->dir_nr, parent);
|
|
if (rinfo->dir_dir)
|
|
ceph_fill_dirfrag(d_inode(parent), rinfo->dir_dir);
|
|
|
|
if (ceph_frag_is_leftmost(frag) &&
|
|
req->r_readdir_offset == 2 &&
|
|
!(rinfo->hash_order && last_hash)) {
|
|
/* note dir version at start of readdir so we can
|
|
* tell if any dentries get dropped */
|
|
req->r_dir_release_cnt =
|
|
atomic64_read(&ci->i_release_count);
|
|
req->r_dir_ordered_cnt =
|
|
atomic64_read(&ci->i_ordered_count);
|
|
req->r_readdir_cache_idx = 0;
|
|
}
|
|
}
|
|
|
|
cache_ctl.index = req->r_readdir_cache_idx;
|
|
fpos_offset = req->r_readdir_offset;
|
|
|
|
/* FIXME: release caps/leases if error occurs */
|
|
for (i = 0; i < rinfo->dir_nr; i++) {
|
|
struct ceph_mds_reply_dir_entry *rde = rinfo->dir_entries + i;
|
|
struct ceph_vino tvino;
|
|
|
|
dname.name = rde->name;
|
|
dname.len = rde->name_len;
|
|
dname.hash = full_name_hash(parent, dname.name, dname.len);
|
|
|
|
tvino.ino = le64_to_cpu(rde->inode.in->ino);
|
|
tvino.snap = le64_to_cpu(rde->inode.in->snapid);
|
|
|
|
if (rinfo->hash_order) {
|
|
u32 hash = ceph_str_hash(ci->i_dir_layout.dl_dir_hash,
|
|
rde->name, rde->name_len);
|
|
hash = ceph_frag_value(hash);
|
|
if (hash != last_hash)
|
|
fpos_offset = 2;
|
|
last_hash = hash;
|
|
rde->offset = ceph_make_fpos(hash, fpos_offset++, true);
|
|
} else {
|
|
rde->offset = ceph_make_fpos(frag, fpos_offset++, false);
|
|
}
|
|
|
|
retry_lookup:
|
|
dn = d_lookup(parent, &dname);
|
|
dout("d_lookup on parent=%p name=%.*s got %p\n",
|
|
parent, dname.len, dname.name, dn);
|
|
|
|
if (!dn) {
|
|
dn = d_alloc(parent, &dname);
|
|
dout("d_alloc %p '%.*s' = %p\n", parent,
|
|
dname.len, dname.name, dn);
|
|
if (!dn) {
|
|
dout("d_alloc badness\n");
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
} else if (d_really_is_positive(dn) &&
|
|
(ceph_ino(d_inode(dn)) != tvino.ino ||
|
|
ceph_snap(d_inode(dn)) != tvino.snap)) {
|
|
struct ceph_dentry_info *di = ceph_dentry(dn);
|
|
dout(" dn %p points to wrong inode %p\n",
|
|
dn, d_inode(dn));
|
|
|
|
spin_lock(&dn->d_lock);
|
|
if (di->offset > 0 &&
|
|
di->lease_shared_gen ==
|
|
atomic_read(&ci->i_shared_gen)) {
|
|
__ceph_dir_clear_ordered(ci);
|
|
di->offset = 0;
|
|
}
|
|
spin_unlock(&dn->d_lock);
|
|
|
|
d_delete(dn);
|
|
dput(dn);
|
|
goto retry_lookup;
|
|
}
|
|
|
|
/* inode */
|
|
if (d_really_is_positive(dn)) {
|
|
in = d_inode(dn);
|
|
} else {
|
|
in = ceph_get_inode(parent->d_sb, tvino);
|
|
if (IS_ERR(in)) {
|
|
dout("new_inode badness\n");
|
|
d_drop(dn);
|
|
dput(dn);
|
|
err = PTR_ERR(in);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = ceph_fill_inode(in, NULL, &rde->inode, NULL, session,
|
|
-1, &req->r_caps_reservation);
|
|
if (ret < 0) {
|
|
pr_err("ceph_fill_inode badness on %p\n", in);
|
|
if (d_really_is_negative(dn)) {
|
|
/* avoid calling iput_final() in mds
|
|
* dispatch threads */
|
|
if (in->i_state & I_NEW) {
|
|
ihold(in);
|
|
discard_new_inode(in);
|
|
}
|
|
ceph_async_iput(in);
|
|
}
|
|
d_drop(dn);
|
|
err = ret;
|
|
goto next_item;
|
|
}
|
|
if (in->i_state & I_NEW)
|
|
unlock_new_inode(in);
|
|
|
|
if (d_really_is_negative(dn)) {
|
|
if (ceph_security_xattr_deadlock(in)) {
|
|
dout(" skip splicing dn %p to inode %p"
|
|
" (security xattr deadlock)\n", dn, in);
|
|
ceph_async_iput(in);
|
|
skipped++;
|
|
goto next_item;
|
|
}
|
|
|
|
err = splice_dentry(&dn, in);
|
|
if (err < 0)
|
|
goto next_item;
|
|
}
|
|
|
|
ceph_dentry(dn)->offset = rde->offset;
|
|
|
|
update_dentry_lease(d_inode(parent), dn,
|
|
rde->lease, req->r_session,
|
|
req->r_request_started);
|
|
|
|
if (err == 0 && skipped == 0 && cache_ctl.index >= 0) {
|
|
ret = fill_readdir_cache(d_inode(parent), dn,
|
|
&cache_ctl, req);
|
|
if (ret < 0)
|
|
err = ret;
|
|
}
|
|
next_item:
|
|
dput(dn);
|
|
}
|
|
out:
|
|
if (err == 0 && skipped == 0) {
|
|
set_bit(CEPH_MDS_R_DID_PREPOPULATE, &req->r_req_flags);
|
|
req->r_readdir_cache_idx = cache_ctl.index;
|
|
}
|
|
ceph_readdir_cache_release(&cache_ctl);
|
|
dout("readdir_prepopulate done\n");
|
|
return err;
|
|
}
|
|
|
|
bool ceph_inode_set_size(struct inode *inode, loff_t size)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
bool ret;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size);
|
|
i_size_write(inode, size);
|
|
inode->i_blocks = calc_inode_blocks(size);
|
|
|
|
ret = __ceph_should_report_size(ci);
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Put reference to inode, but avoid calling iput_final() in current thread.
|
|
* iput_final() may wait for reahahead pages. The wait can cause deadlock in
|
|
* some contexts.
|
|
*/
|
|
void ceph_async_iput(struct inode *inode)
|
|
{
|
|
if (!inode)
|
|
return;
|
|
for (;;) {
|
|
if (atomic_add_unless(&inode->i_count, -1, 1))
|
|
break;
|
|
if (queue_work(ceph_inode_to_client(inode)->inode_wq,
|
|
&ceph_inode(inode)->i_work))
|
|
break;
|
|
/* queue work failed, i_count must be at least 2 */
|
|
}
|
|
}
|
|
|
|
void ceph_queue_inode_work(struct inode *inode, int work_bit)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
set_bit(work_bit, &ci->i_work_mask);
|
|
|
|
ihold(inode);
|
|
if (queue_work(fsc->inode_wq, &ci->i_work)) {
|
|
dout("queue_inode_work %p, mask=%lx\n", inode, ci->i_work_mask);
|
|
} else {
|
|
dout("queue_inode_work %p already queued, mask=%lx\n",
|
|
inode, ci->i_work_mask);
|
|
iput(inode);
|
|
}
|
|
}
|
|
|
|
static void ceph_do_invalidate_pages(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
u32 orig_gen;
|
|
int check = 0;
|
|
|
|
mutex_lock(&ci->i_truncate_mutex);
|
|
|
|
if (READ_ONCE(fsc->mount_state) >= CEPH_MOUNT_SHUTDOWN) {
|
|
pr_warn_ratelimited("invalidate_pages %p %lld forced umount\n",
|
|
inode, ceph_ino(inode));
|
|
mapping_set_error(inode->i_mapping, -EIO);
|
|
truncate_pagecache(inode, 0);
|
|
mutex_unlock(&ci->i_truncate_mutex);
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
dout("invalidate_pages %p gen %d revoking %d\n", inode,
|
|
ci->i_rdcache_gen, ci->i_rdcache_revoking);
|
|
if (ci->i_rdcache_revoking != ci->i_rdcache_gen) {
|
|
if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
|
|
check = 1;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
mutex_unlock(&ci->i_truncate_mutex);
|
|
goto out;
|
|
}
|
|
orig_gen = ci->i_rdcache_gen;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
if (invalidate_inode_pages2(inode->i_mapping) < 0) {
|
|
pr_err("invalidate_pages %p fails\n", inode);
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (orig_gen == ci->i_rdcache_gen &&
|
|
orig_gen == ci->i_rdcache_revoking) {
|
|
dout("invalidate_pages %p gen %d successful\n", inode,
|
|
ci->i_rdcache_gen);
|
|
ci->i_rdcache_revoking--;
|
|
check = 1;
|
|
} else {
|
|
dout("invalidate_pages %p gen %d raced, now %d revoking %d\n",
|
|
inode, orig_gen, ci->i_rdcache_gen,
|
|
ci->i_rdcache_revoking);
|
|
if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE))
|
|
check = 1;
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
mutex_unlock(&ci->i_truncate_mutex);
|
|
out:
|
|
if (check)
|
|
ceph_check_caps(ci, 0, NULL);
|
|
}
|
|
|
|
/*
|
|
* Make sure any pending truncation is applied before doing anything
|
|
* that may depend on it.
|
|
*/
|
|
void __ceph_do_pending_vmtruncate(struct inode *inode)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u64 to;
|
|
int wrbuffer_refs, finish = 0;
|
|
|
|
mutex_lock(&ci->i_truncate_mutex);
|
|
retry:
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (ci->i_truncate_pending == 0) {
|
|
dout("__do_pending_vmtruncate %p none pending\n", inode);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
mutex_unlock(&ci->i_truncate_mutex);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* make sure any dirty snapped pages are flushed before we
|
|
* possibly truncate them.. so write AND block!
|
|
*/
|
|
if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
dout("__do_pending_vmtruncate %p flushing snaps first\n",
|
|
inode);
|
|
filemap_write_and_wait_range(&inode->i_data, 0,
|
|
inode->i_sb->s_maxbytes);
|
|
goto retry;
|
|
}
|
|
|
|
/* there should be no reader or writer */
|
|
WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref);
|
|
|
|
to = ci->i_truncate_size;
|
|
wrbuffer_refs = ci->i_wrbuffer_ref;
|
|
dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode,
|
|
ci->i_truncate_pending, to);
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
truncate_pagecache(inode, to);
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (to == ci->i_truncate_size) {
|
|
ci->i_truncate_pending = 0;
|
|
finish = 1;
|
|
}
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (!finish)
|
|
goto retry;
|
|
|
|
mutex_unlock(&ci->i_truncate_mutex);
|
|
|
|
if (wrbuffer_refs == 0)
|
|
ceph_check_caps(ci, 0, NULL);
|
|
|
|
wake_up_all(&ci->i_cap_wq);
|
|
}
|
|
|
|
static void ceph_inode_work(struct work_struct *work)
|
|
{
|
|
struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info,
|
|
i_work);
|
|
struct inode *inode = &ci->vfs_inode;
|
|
|
|
if (test_and_clear_bit(CEPH_I_WORK_WRITEBACK, &ci->i_work_mask)) {
|
|
dout("writeback %p\n", inode);
|
|
filemap_fdatawrite(&inode->i_data);
|
|
}
|
|
if (test_and_clear_bit(CEPH_I_WORK_INVALIDATE_PAGES, &ci->i_work_mask))
|
|
ceph_do_invalidate_pages(inode);
|
|
|
|
if (test_and_clear_bit(CEPH_I_WORK_VMTRUNCATE, &ci->i_work_mask))
|
|
__ceph_do_pending_vmtruncate(inode);
|
|
|
|
if (test_and_clear_bit(CEPH_I_WORK_CHECK_CAPS, &ci->i_work_mask))
|
|
ceph_check_caps(ci, 0, NULL);
|
|
|
|
if (test_and_clear_bit(CEPH_I_WORK_FLUSH_SNAPS, &ci->i_work_mask))
|
|
ceph_flush_snaps(ci, NULL);
|
|
|
|
iput(inode);
|
|
}
|
|
|
|
/*
|
|
* symlinks
|
|
*/
|
|
static const struct inode_operations ceph_symlink_iops = {
|
|
.get_link = simple_get_link,
|
|
.setattr = ceph_setattr,
|
|
.getattr = ceph_getattr,
|
|
.listxattr = ceph_listxattr,
|
|
};
|
|
|
|
int __ceph_setattr(struct inode *inode, struct iattr *attr)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
unsigned int ia_valid = attr->ia_valid;
|
|
struct ceph_mds_request *req;
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_cap_flush *prealloc_cf;
|
|
int issued;
|
|
int release = 0, dirtied = 0;
|
|
int mask = 0;
|
|
int err = 0;
|
|
int inode_dirty_flags = 0;
|
|
bool lock_snap_rwsem = false;
|
|
|
|
prealloc_cf = ceph_alloc_cap_flush();
|
|
if (!prealloc_cf)
|
|
return -ENOMEM;
|
|
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR,
|
|
USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
ceph_free_cap_flush(prealloc_cf);
|
|
return PTR_ERR(req);
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
issued = __ceph_caps_issued(ci, NULL);
|
|
|
|
if (!ci->i_head_snapc &&
|
|
(issued & (CEPH_CAP_ANY_EXCL | CEPH_CAP_FILE_WR))) {
|
|
lock_snap_rwsem = true;
|
|
if (!down_read_trylock(&mdsc->snap_rwsem)) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
down_read(&mdsc->snap_rwsem);
|
|
spin_lock(&ci->i_ceph_lock);
|
|
issued = __ceph_caps_issued(ci, NULL);
|
|
}
|
|
}
|
|
|
|
dout("setattr %p issued %s\n", inode, ceph_cap_string(issued));
|
|
|
|
if (ia_valid & ATTR_UID) {
|
|
dout("setattr %p uid %d -> %d\n", inode,
|
|
from_kuid(&init_user_ns, inode->i_uid),
|
|
from_kuid(&init_user_ns, attr->ia_uid));
|
|
if (issued & CEPH_CAP_AUTH_EXCL) {
|
|
inode->i_uid = attr->ia_uid;
|
|
dirtied |= CEPH_CAP_AUTH_EXCL;
|
|
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
|
|
!uid_eq(attr->ia_uid, inode->i_uid)) {
|
|
req->r_args.setattr.uid = cpu_to_le32(
|
|
from_kuid(&init_user_ns, attr->ia_uid));
|
|
mask |= CEPH_SETATTR_UID;
|
|
release |= CEPH_CAP_AUTH_SHARED;
|
|
}
|
|
}
|
|
if (ia_valid & ATTR_GID) {
|
|
dout("setattr %p gid %d -> %d\n", inode,
|
|
from_kgid(&init_user_ns, inode->i_gid),
|
|
from_kgid(&init_user_ns, attr->ia_gid));
|
|
if (issued & CEPH_CAP_AUTH_EXCL) {
|
|
inode->i_gid = attr->ia_gid;
|
|
dirtied |= CEPH_CAP_AUTH_EXCL;
|
|
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
|
|
!gid_eq(attr->ia_gid, inode->i_gid)) {
|
|
req->r_args.setattr.gid = cpu_to_le32(
|
|
from_kgid(&init_user_ns, attr->ia_gid));
|
|
mask |= CEPH_SETATTR_GID;
|
|
release |= CEPH_CAP_AUTH_SHARED;
|
|
}
|
|
}
|
|
if (ia_valid & ATTR_MODE) {
|
|
dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode,
|
|
attr->ia_mode);
|
|
if (issued & CEPH_CAP_AUTH_EXCL) {
|
|
inode->i_mode = attr->ia_mode;
|
|
dirtied |= CEPH_CAP_AUTH_EXCL;
|
|
} else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 ||
|
|
attr->ia_mode != inode->i_mode) {
|
|
inode->i_mode = attr->ia_mode;
|
|
req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode);
|
|
mask |= CEPH_SETATTR_MODE;
|
|
release |= CEPH_CAP_AUTH_SHARED;
|
|
}
|
|
}
|
|
|
|
if (ia_valid & ATTR_ATIME) {
|
|
dout("setattr %p atime %lld.%ld -> %lld.%ld\n", inode,
|
|
inode->i_atime.tv_sec, inode->i_atime.tv_nsec,
|
|
attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec);
|
|
if (issued & CEPH_CAP_FILE_EXCL) {
|
|
ci->i_time_warp_seq++;
|
|
inode->i_atime = attr->ia_atime;
|
|
dirtied |= CEPH_CAP_FILE_EXCL;
|
|
} else if ((issued & CEPH_CAP_FILE_WR) &&
|
|
timespec64_compare(&inode->i_atime,
|
|
&attr->ia_atime) < 0) {
|
|
inode->i_atime = attr->ia_atime;
|
|
dirtied |= CEPH_CAP_FILE_WR;
|
|
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
|
|
!timespec64_equal(&inode->i_atime, &attr->ia_atime)) {
|
|
ceph_encode_timespec64(&req->r_args.setattr.atime,
|
|
&attr->ia_atime);
|
|
mask |= CEPH_SETATTR_ATIME;
|
|
release |= CEPH_CAP_FILE_SHARED |
|
|
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
|
|
}
|
|
}
|
|
if (ia_valid & ATTR_SIZE) {
|
|
dout("setattr %p size %lld -> %lld\n", inode,
|
|
inode->i_size, attr->ia_size);
|
|
if ((issued & CEPH_CAP_FILE_EXCL) &&
|
|
attr->ia_size > inode->i_size) {
|
|
i_size_write(inode, attr->ia_size);
|
|
inode->i_blocks = calc_inode_blocks(attr->ia_size);
|
|
ci->i_reported_size = attr->ia_size;
|
|
dirtied |= CEPH_CAP_FILE_EXCL;
|
|
ia_valid |= ATTR_MTIME;
|
|
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
|
|
attr->ia_size != inode->i_size) {
|
|
req->r_args.setattr.size = cpu_to_le64(attr->ia_size);
|
|
req->r_args.setattr.old_size =
|
|
cpu_to_le64(inode->i_size);
|
|
mask |= CEPH_SETATTR_SIZE;
|
|
release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_EXCL |
|
|
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
|
|
}
|
|
}
|
|
if (ia_valid & ATTR_MTIME) {
|
|
dout("setattr %p mtime %lld.%ld -> %lld.%ld\n", inode,
|
|
inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec,
|
|
attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec);
|
|
if (issued & CEPH_CAP_FILE_EXCL) {
|
|
ci->i_time_warp_seq++;
|
|
inode->i_mtime = attr->ia_mtime;
|
|
dirtied |= CEPH_CAP_FILE_EXCL;
|
|
} else if ((issued & CEPH_CAP_FILE_WR) &&
|
|
timespec64_compare(&inode->i_mtime,
|
|
&attr->ia_mtime) < 0) {
|
|
inode->i_mtime = attr->ia_mtime;
|
|
dirtied |= CEPH_CAP_FILE_WR;
|
|
} else if ((issued & CEPH_CAP_FILE_SHARED) == 0 ||
|
|
!timespec64_equal(&inode->i_mtime, &attr->ia_mtime)) {
|
|
ceph_encode_timespec64(&req->r_args.setattr.mtime,
|
|
&attr->ia_mtime);
|
|
mask |= CEPH_SETATTR_MTIME;
|
|
release |= CEPH_CAP_FILE_SHARED |
|
|
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_WR;
|
|
}
|
|
}
|
|
|
|
/* these do nothing */
|
|
if (ia_valid & ATTR_CTIME) {
|
|
bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME|
|
|
ATTR_MODE|ATTR_UID|ATTR_GID)) == 0;
|
|
dout("setattr %p ctime %lld.%ld -> %lld.%ld (%s)\n", inode,
|
|
inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec,
|
|
attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec,
|
|
only ? "ctime only" : "ignored");
|
|
if (only) {
|
|
/*
|
|
* if kernel wants to dirty ctime but nothing else,
|
|
* we need to choose a cap to dirty under, or do
|
|
* a almost-no-op setattr
|
|
*/
|
|
if (issued & CEPH_CAP_AUTH_EXCL)
|
|
dirtied |= CEPH_CAP_AUTH_EXCL;
|
|
else if (issued & CEPH_CAP_FILE_EXCL)
|
|
dirtied |= CEPH_CAP_FILE_EXCL;
|
|
else if (issued & CEPH_CAP_XATTR_EXCL)
|
|
dirtied |= CEPH_CAP_XATTR_EXCL;
|
|
else
|
|
mask |= CEPH_SETATTR_CTIME;
|
|
}
|
|
}
|
|
if (ia_valid & ATTR_FILE)
|
|
dout("setattr %p ATTR_FILE ... hrm!\n", inode);
|
|
|
|
if (dirtied) {
|
|
inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied,
|
|
&prealloc_cf);
|
|
inode->i_ctime = attr->ia_ctime;
|
|
}
|
|
|
|
release &= issued;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (lock_snap_rwsem)
|
|
up_read(&mdsc->snap_rwsem);
|
|
|
|
if (inode_dirty_flags)
|
|
__mark_inode_dirty(inode, inode_dirty_flags);
|
|
|
|
|
|
if (mask) {
|
|
req->r_inode = inode;
|
|
ihold(inode);
|
|
req->r_inode_drop = release;
|
|
req->r_args.setattr.mask = cpu_to_le32(mask);
|
|
req->r_num_caps = 1;
|
|
req->r_stamp = attr->ia_ctime;
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req);
|
|
}
|
|
dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err,
|
|
ceph_cap_string(dirtied), mask);
|
|
|
|
ceph_mdsc_put_request(req);
|
|
ceph_free_cap_flush(prealloc_cf);
|
|
|
|
if (err >= 0 && (mask & CEPH_SETATTR_SIZE))
|
|
__ceph_do_pending_vmtruncate(inode);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* setattr
|
|
*/
|
|
int ceph_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
|
|
struct iattr *attr)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
|
|
int err;
|
|
|
|
if (ceph_snap(inode) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
err = setattr_prepare(&init_user_ns, dentry, attr);
|
|
if (err != 0)
|
|
return err;
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
attr->ia_size > max(inode->i_size, fsc->max_file_size))
|
|
return -EFBIG;
|
|
|
|
if ((attr->ia_valid & ATTR_SIZE) &&
|
|
ceph_quota_is_max_bytes_exceeded(inode, attr->ia_size))
|
|
return -EDQUOT;
|
|
|
|
err = __ceph_setattr(inode, attr);
|
|
|
|
if (err >= 0 && (attr->ia_valid & ATTR_MODE))
|
|
err = posix_acl_chmod(&init_user_ns, inode, attr->ia_mode);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Verify that we have a lease on the given mask. If not,
|
|
* do a getattr against an mds.
|
|
*/
|
|
int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
|
|
int mask, bool force)
|
|
{
|
|
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
struct ceph_mds_request *req;
|
|
int mode;
|
|
int err;
|
|
|
|
if (ceph_snap(inode) == CEPH_SNAPDIR) {
|
|
dout("do_getattr inode %p SNAPDIR\n", inode);
|
|
return 0;
|
|
}
|
|
|
|
dout("do_getattr inode %p mask %s mode 0%o\n",
|
|
inode, ceph_cap_string(mask), inode->i_mode);
|
|
if (!force && ceph_caps_issued_mask_metric(ceph_inode(inode), mask, 1))
|
|
return 0;
|
|
|
|
mode = (mask & CEPH_STAT_RSTAT) ? USE_AUTH_MDS : USE_ANY_MDS;
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, mode);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
req->r_inode = inode;
|
|
ihold(inode);
|
|
req->r_num_caps = 1;
|
|
req->r_args.getattr.mask = cpu_to_le32(mask);
|
|
req->r_locked_page = locked_page;
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req);
|
|
if (locked_page && err == 0) {
|
|
u64 inline_version = req->r_reply_info.targeti.inline_version;
|
|
if (inline_version == 0) {
|
|
/* the reply is supposed to contain inline data */
|
|
err = -EINVAL;
|
|
} else if (inline_version == CEPH_INLINE_NONE) {
|
|
err = -ENODATA;
|
|
} else {
|
|
err = req->r_reply_info.targeti.inline_len;
|
|
}
|
|
}
|
|
ceph_mdsc_put_request(req);
|
|
dout("do_getattr result=%d\n", err);
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* Check inode permissions. We verify we have a valid value for
|
|
* the AUTH cap, then call the generic handler.
|
|
*/
|
|
int ceph_permission(struct user_namespace *mnt_userns, struct inode *inode,
|
|
int mask)
|
|
{
|
|
int err;
|
|
|
|
if (mask & MAY_NOT_BLOCK)
|
|
return -ECHILD;
|
|
|
|
err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
|
|
|
|
if (!err)
|
|
err = generic_permission(&init_user_ns, inode, mask);
|
|
return err;
|
|
}
|
|
|
|
/* Craft a mask of needed caps given a set of requested statx attrs. */
|
|
static int statx_to_caps(u32 want, umode_t mode)
|
|
{
|
|
int mask = 0;
|
|
|
|
if (want & (STATX_MODE|STATX_UID|STATX_GID|STATX_CTIME|STATX_BTIME))
|
|
mask |= CEPH_CAP_AUTH_SHARED;
|
|
|
|
if (want & (STATX_NLINK|STATX_CTIME)) {
|
|
/*
|
|
* The link count for directories depends on inode->i_subdirs,
|
|
* and that is only updated when Fs caps are held.
|
|
*/
|
|
if (S_ISDIR(mode))
|
|
mask |= CEPH_CAP_FILE_SHARED;
|
|
else
|
|
mask |= CEPH_CAP_LINK_SHARED;
|
|
}
|
|
|
|
if (want & (STATX_ATIME|STATX_MTIME|STATX_CTIME|STATX_SIZE|
|
|
STATX_BLOCKS))
|
|
mask |= CEPH_CAP_FILE_SHARED;
|
|
|
|
if (want & (STATX_CTIME))
|
|
mask |= CEPH_CAP_XATTR_SHARED;
|
|
|
|
return mask;
|
|
}
|
|
|
|
/*
|
|
* Get all the attributes. If we have sufficient caps for the requested attrs,
|
|
* then we can avoid talking to the MDS at all.
|
|
*/
|
|
int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
|
|
struct kstat *stat, u32 request_mask, unsigned int flags)
|
|
{
|
|
struct inode *inode = d_inode(path->dentry);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
u32 valid_mask = STATX_BASIC_STATS;
|
|
int err = 0;
|
|
|
|
/* Skip the getattr altogether if we're asked not to sync */
|
|
if (!(flags & AT_STATX_DONT_SYNC)) {
|
|
err = ceph_do_getattr(inode,
|
|
statx_to_caps(request_mask, inode->i_mode),
|
|
flags & AT_STATX_FORCE_SYNC);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
generic_fillattr(&init_user_ns, inode, stat);
|
|
stat->ino = ceph_present_inode(inode);
|
|
|
|
/*
|
|
* btime on newly-allocated inodes is 0, so if this is still set to
|
|
* that, then assume that it's not valid.
|
|
*/
|
|
if (ci->i_btime.tv_sec || ci->i_btime.tv_nsec) {
|
|
stat->btime = ci->i_btime;
|
|
valid_mask |= STATX_BTIME;
|
|
}
|
|
|
|
if (ceph_snap(inode) == CEPH_NOSNAP)
|
|
stat->dev = inode->i_sb->s_dev;
|
|
else
|
|
stat->dev = ci->i_snapid_map ? ci->i_snapid_map->dev : 0;
|
|
|
|
if (S_ISDIR(inode->i_mode)) {
|
|
if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb),
|
|
RBYTES))
|
|
stat->size = ci->i_rbytes;
|
|
else
|
|
stat->size = ci->i_files + ci->i_subdirs;
|
|
stat->blocks = 0;
|
|
stat->blksize = 65536;
|
|
/*
|
|
* Some applications rely on the number of st_nlink
|
|
* value on directories to be either 0 (if unlinked)
|
|
* or 2 + number of subdirectories.
|
|
*/
|
|
if (stat->nlink == 1)
|
|
/* '.' + '..' + subdirs */
|
|
stat->nlink = 1 + 1 + ci->i_subdirs;
|
|
}
|
|
|
|
stat->result_mask = request_mask & valid_mask;
|
|
return err;
|
|
}
|