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ceph: add acl for cephfs

Browse source 
Signed-off-by: Guangliang Zhao <lucienchao@gmail.com>
Reviewed-by: Li Wang <li.wang@ubuntykylin.com>
Reviewed-by: Zheng Yan <zheng.z.yan@intel.com>
This commit is contained in:
Guangliang Zhao 2013-11-11 15:18:03 +08:00 • committed by Ilya Dryomov
commit 7221fe4c2e
9 changed files with 451 additions and 13 deletions
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13
fs/ceph/Kconfig
View file

@ -25,3 +25,16 @@ config CEPH_FSCACHE
caching support for Ceph clients using FS-Cache
endif
config CEPH_FS_POSIX_ACL
bool "Ceph POSIX Access Control Lists"
depends on CEPH_FS
select FS_POSIX_ACL
help
POSIX Access Control Lists (ACLs) support permissions for users and
groups beyond the owner/group/world scheme.
To learn more about Access Control Lists, visit the POSIX ACLs for
Linux website <http://acl.bestbits.at/>.
If you don't know what Access Control Lists are, say N

1
fs/ceph/Makefile
View file

@ -10,3 +10,4 @@ ceph-y := super.o inode.o dir.o file.o locks.o addr.o ioctl.o \
debugfs.o
ceph-$(CONFIG_CEPH_FSCACHE) += cache.o
ceph-$(CONFIG_CEPH_FS_POSIX_ACL) += acl.o

332
fs/ceph/acl.c Normal file
View file

@ -0,0 +1,332 @@
/*
* linux/fs/ceph/acl.c
*
* Copyright (C) 2013 Guangliang Zhao, <lucienchao@gmail.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA.
*/
#include <linux/ceph/ceph_debug.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/xattr.h>
#include <linux/posix_acl_xattr.h>
#include <linux/posix_acl.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include "super.h"
static inline void ceph_set_cached_acl(struct inode *inode,
int type, struct posix_acl *acl)
{
struct ceph_inode_info *ci = ceph_inode(inode);
spin_lock(&ci->i_ceph_lock);
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
set_cached_acl(inode, type, acl);
spin_unlock(&ci->i_ceph_lock);
}
static inline struct posix_acl *ceph_get_cached_acl(struct inode *inode,
int type)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct posix_acl *acl = ACL_NOT_CACHED;
spin_lock(&ci->i_ceph_lock);
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0))
acl = get_cached_acl(inode, type);
spin_unlock(&ci->i_ceph_lock);
return acl;
}
void ceph_forget_all_cached_acls(struct inode *inode)
{
forget_all_cached_acls(inode);
}
struct posix_acl *ceph_get_acl(struct inode *inode, int type)
{
int size;
const char *name;
char *value = NULL;
struct posix_acl *acl;
if (!IS_POSIXACL(inode))
return NULL;
acl = ceph_get_cached_acl(inode, type);
if (acl != ACL_NOT_CACHED)
return acl;
switch (type) {
case ACL_TYPE_ACCESS:
name = POSIX_ACL_XATTR_ACCESS;
break;
case ACL_TYPE_DEFAULT:
name = POSIX_ACL_XATTR_DEFAULT;
break;
default:
BUG();
}
size = __ceph_getxattr(inode, name, "", 0);
if (size > 0) {
value = kzalloc(size, GFP_NOFS);
if (!value)
return ERR_PTR(-ENOMEM);
size = __ceph_getxattr(inode, name, value, size);
}
if (size > 0)
acl = posix_acl_from_xattr(&init_user_ns, value, size);
else if (size == -ERANGE || size == -ENODATA || size == 0)
acl = NULL;
else
acl = ERR_PTR(-EIO);
kfree(value);
if (!IS_ERR(acl))
ceph_set_cached_acl(inode, type, acl);
return acl;
}
static int ceph_set_acl(struct dentry *dentry, struct inode *inode,
struct posix_acl *acl, int type)
{
int ret = 0, size = 0;
const char *name = NULL;
char *value = NULL;
struct iattr newattrs;
umode_t new_mode = inode->i_mode, old_mode = inode->i_mode;
if (acl) {
ret = posix_acl_valid(acl);
if (ret < 0)
goto out;
}
switch (type) {
case ACL_TYPE_ACCESS:
name = POSIX_ACL_XATTR_ACCESS;
if (acl) {
ret = posix_acl_equiv_mode(acl, &new_mode);
if (ret < 0)
goto out;
if (ret == 0)
acl = NULL;
}
break;
case ACL_TYPE_DEFAULT:
if (!S_ISDIR(inode->i_mode)) {
ret = acl ? -EINVAL : 0;
goto out;
}
name = POSIX_ACL_XATTR_DEFAULT;
break;
default:
ret = -EINVAL;
goto out;
}
if (acl) {
size = posix_acl_xattr_size(acl->a_count);
value = kmalloc(size, GFP_NOFS);
if (!value) {
ret = -ENOMEM;
goto out;
}
ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
if (ret < 0)
goto out_free;
}
if (new_mode != old_mode) {
newattrs.ia_mode = new_mode;
newattrs.ia_valid = ATTR_MODE;
ret = ceph_setattr(dentry, &newattrs);
if (ret)
goto out_free;
}
if (value)
ret = __ceph_setxattr(dentry, name, value, size, 0);
else
ret = __ceph_removexattr(dentry, name);
if (ret) {
if (new_mode != old_mode) {
newattrs.ia_mode = old_mode;
newattrs.ia_valid = ATTR_MODE;
ceph_setattr(dentry, &newattrs);
}
goto out_free;
}
ceph_set_cached_acl(inode, type, acl);
out_free:
kfree(value);
out:
return ret;
}
int ceph_init_acl(struct dentry *dentry, struct inode *inode, struct inode *dir)
{
struct posix_acl *acl = NULL;
int ret = 0;
if (!S_ISLNK(inode->i_mode)) {
if (IS_POSIXACL(dir)) {
acl = ceph_get_acl(dir, ACL_TYPE_DEFAULT);
if (IS_ERR(acl)) {
ret = PTR_ERR(acl);
goto out;
}
}
if (!acl)
inode->i_mode &= ~current_umask();
}
if (IS_POSIXACL(dir) && acl) {
if (S_ISDIR(inode->i_mode)) {
ret = ceph_set_acl(dentry, inode, acl,
ACL_TYPE_DEFAULT);
if (ret)
goto out_release;
}
ret = posix_acl_create(&acl, GFP_NOFS, &inode->i_mode);
if (ret < 0)
goto out;
else if (ret > 0)
ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
else
cache_no_acl(inode);
} else {
cache_no_acl(inode);
}
out_release:
posix_acl_release(acl);
out:
return ret;
}
int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
{
struct posix_acl *acl;
int ret = 0;
if (S_ISLNK(inode->i_mode)) {
ret = -EOPNOTSUPP;
goto out;
}
if (!IS_POSIXACL(inode))
goto out;
acl = ceph_get_acl(inode, ACL_TYPE_ACCESS);
if (IS_ERR_OR_NULL(acl)) {
ret = PTR_ERR(acl);
goto out;
}
ret = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
if (ret)
goto out;
ret = ceph_set_acl(dentry, inode, acl, ACL_TYPE_ACCESS);
posix_acl_release(acl);
out:
return ret;
}
static int ceph_xattr_acl_get(struct dentry *dentry, const char *name,
void *value, size_t size, int type)
{
struct posix_acl *acl;
int ret = 0;
if (!IS_POSIXACL(dentry->d_inode))
return -EOPNOTSUPP;
acl = ceph_get_acl(dentry->d_inode, type);
if (IS_ERR(acl))
return PTR_ERR(acl);
if (acl == NULL)
return -ENODATA;
ret = posix_acl_to_xattr(&init_user_ns, acl, value, size);
posix_acl_release(acl);
return ret;
}
static int ceph_xattr_acl_set(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags, int type)
{
int ret = 0;
struct posix_acl *acl = NULL;
if (!inode_owner_or_capable(dentry->d_inode)) {
ret = -EPERM;
goto out;
}
if (!IS_POSIXACL(dentry->d_inode)) {
ret = -EOPNOTSUPP;
goto out;
}
if (value) {
acl = posix_acl_from_xattr(&init_user_ns, value, size);
if (IS_ERR(acl)) {
ret = PTR_ERR(acl);
goto out;
}
if (acl) {
ret = posix_acl_valid(acl);
if (ret)
goto out_release;
}
}
ret = ceph_set_acl(dentry, dentry->d_inode, acl, type);
out_release:
posix_acl_release(acl);
out:
return ret;
}
const struct xattr_handler ceph_xattr_acl_default_handler = {
.prefix = POSIX_ACL_XATTR_DEFAULT,
.flags = ACL_TYPE_DEFAULT,
.get = ceph_xattr_acl_get,
.set = ceph_xattr_acl_set,
};
const struct xattr_handler ceph_xattr_acl_access_handler = {
.prefix = POSIX_ACL_XATTR_ACCESS,
.flags = ACL_TYPE_ACCESS,
.get = ceph_xattr_acl_get,
.set = ceph_xattr_acl_set,
};

1
fs/ceph/caps.c
View file

@ -2464,6 +2464,7 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
ceph_buffer_put(ci->i_xattrs.blob);
ci->i_xattrs.blob = ceph_buffer_get(xattr_buf);
ci->i_xattrs.version = version;
ceph_forget_all_cached_acls(inode);
}
}

5
fs/ceph/dir.c
View file

@ -693,6 +693,10 @@ static int ceph_mknod(struct inode *dir, struct dentry *dentry,
if (!err && !req->r_reply_info.head->is_dentry)
err = ceph_handle_notrace_create(dir, dentry);
ceph_mdsc_put_request(req);
if (!err)
err = ceph_init_acl(dentry, dentry->d_inode, dir);
if (err)
d_drop(dentry);
return err;
@ -1293,6 +1297,7 @@ const struct inode_operations ceph_dir_iops = {
.getxattr = ceph_getxattr,
.listxattr = ceph_listxattr,
.removexattr = ceph_removexattr,
.get_acl = ceph_get_acl,
.mknod = ceph_mknod,
.symlink = ceph_symlink,
.mkdir = ceph_mkdir,

11
fs/ceph/inode.c
View file

@ -95,6 +95,7 @@ const struct inode_operations ceph_file_iops = {
.getxattr = ceph_getxattr,
.listxattr = ceph_listxattr,
.removexattr = ceph_removexattr,
.get_acl = ceph_get_acl,
};
@ -680,6 +681,7 @@ static int fill_inode(struct inode *inode,
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);
xattr_blob = NULL;
}
@ -1612,6 +1614,7 @@ static const struct inode_operations ceph_symlink_iops = {
.getxattr = ceph_getxattr,
.listxattr = ceph_listxattr,
.removexattr = ceph_removexattr,
.get_acl = ceph_get_acl,
};
/*
@ -1685,6 +1688,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
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;
@ -1800,6 +1804,12 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
if (inode_dirty_flags)
__mark_inode_dirty(inode, inode_dirty_flags);
if (ia_valid & ATTR_MODE) {
err = ceph_acl_chmod(dentry, inode);
if (err)
goto out_put;
}
if (mask) {
req->r_inode = inode;
ihold(inode);
@ -1819,6 +1829,7 @@ int ceph_setattr(struct dentry *dentry, struct iattr *attr)
return err;
out:
spin_unlock(&ci->i_ceph_lock);
out_put:
ceph_mdsc_put_request(req);
return err;
}

4
fs/ceph/super.c
View file

@ -819,7 +819,11 @@ static int ceph_set_super(struct super_block *s, void *data)
s->s_flags = fsc->mount_options->sb_flags;
s->s_maxbytes = 1ULL << 40; /* temp value until we get mdsmap */
#ifdef CONFIG_CEPH_FS_POSIX_ACL
s->s_flags |= MS_POSIXACL;
#endif
s->s_xattr = ceph_xattr_handlers;
s->s_fs_info = fsc;
fsc->sb = s;

37
fs/ceph/super.h
View file

@ -335,7 +335,6 @@ struct ceph_inode_info {
u32 i_fscache_gen; /* sequence, for delayed fscache validate */
struct work_struct i_revalidate_work;
#endif
struct inode vfs_inode; /* at end */
};
@ -725,6 +724,9 @@ extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
/* xattr.c */
extern int ceph_setxattr(struct dentry *, const char *, const void *,
size_t, int);
int __ceph_setxattr(struct dentry *, const char *, const void *, size_t, int);
ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t);
int __ceph_removexattr(struct dentry *, const char *);
extern ssize_t ceph_getxattr(struct dentry *, const char *, void *, size_t);
extern ssize_t ceph_listxattr(struct dentry *, char *, size_t);
extern int ceph_removexattr(struct dentry *, const char *);
@ -733,6 +735,39 @@ extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci);
extern void __init ceph_xattr_init(void);
extern void ceph_xattr_exit(void);
/* acl.c */
extern const struct xattr_handler ceph_xattr_acl_access_handler;
extern const struct xattr_handler ceph_xattr_acl_default_handler;
extern const struct xattr_handler *ceph_xattr_handlers[];
#ifdef CONFIG_CEPH_FS_POSIX_ACL
struct posix_acl *ceph_get_acl(struct inode *, int);
int ceph_init_acl(struct dentry *, struct inode *, struct inode *);
int ceph_acl_chmod(struct dentry *, struct inode *);
void ceph_forget_all_cached_acls(struct inode *inode);
#else
#define ceph_get_acl NULL
static inline int ceph_init_acl(struct dentry *dentry, struct inode *inode,
struct inode *dir)
{
return 0;
}
static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode)
{
return 0;
}
static inline void ceph_forget_all_cached_acls(struct inode *inode)
{
}
#endif
/* caps.c */
extern const char *ceph_cap_string(int c);
extern void ceph_handle_caps(struct ceph_mds_session *session,

60
fs/ceph/xattr.c
View file

@ -11,11 +11,24 @@
#define XATTR_CEPH_PREFIX "ceph."
#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
/*
* List of handlers for synthetic system.* attributes. Other
* attributes are handled directly.
*/
const struct xattr_handler *ceph_xattr_handlers[] = {
#ifdef CONFIG_CEPH_FS_POSIX_ACL
&ceph_xattr_acl_access_handler,
&ceph_xattr_acl_default_handler,
#endif
NULL,
};
static bool ceph_is_valid_xattr(const char *name)
{
return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
!strncmp(name, XATTR_SECURITY_PREFIX,
XATTR_SECURITY_PREFIX_LEN) ||
!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) ||
!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
}
@ -663,10 +676,9 @@ void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
}
}
ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
size_t size)
{
struct inode *inode = dentry->d_inode;
struct ceph_inode_info *ci = ceph_inode(inode);
int err;
struct ceph_inode_xattr *xattr;
@ -675,7 +687,6 @@ ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
if (!ceph_is_valid_xattr(name))
return -ENODATA;
/* let's see if a virtual xattr was requested */
vxattr = ceph_match_vxattr(inode, name);
if (vxattr && !(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
@ -725,6 +736,15 @@ out:
return err;
}
ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
size_t size)
{
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_getxattr(dentry, name, value, size);
return __ceph_getxattr(dentry->d_inode, name, value, size);
}
ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
{
struct inode *inode = dentry->d_inode;
@ -863,8 +883,8 @@ out:
return err;
}
int ceph_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
int __ceph_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = dentry->d_inode;
struct ceph_vxattr *vxattr;
@ -879,9 +899,6 @@ int ceph_setxattr(struct dentry *dentry, const char *name,
struct ceph_inode_xattr *xattr = NULL;
int required_blob_size;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
@ -958,6 +975,18 @@ out:
return err;
}
int ceph_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
return -EROFS;
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_setxattr(dentry, name, value, size, flags);
return __ceph_setxattr(dentry, name, value, size, flags);
}
static int ceph_send_removexattr(struct dentry *dentry, const char *name)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb);
@ -984,7 +1013,7 @@ static int ceph_send_removexattr(struct dentry *dentry, const char *name)
return err;
}
int ceph_removexattr(struct dentry *dentry, const char *name)
int __ceph_removexattr(struct dentry *dentry, const char *name)
{
struct inode *inode = dentry->d_inode;
struct ceph_vxattr *vxattr;
@ -994,9 +1023,6 @@ int ceph_removexattr(struct dentry *dentry, const char *name)
int required_blob_size;
int dirty;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
@ -1053,3 +1079,13 @@ out:
return err;
}
int ceph_removexattr(struct dentry *dentry, const char *name)
{
if (ceph_snap(dentry->d_inode) != CEPH_NOSNAP)
return -EROFS;
if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
return generic_removexattr(dentry, name);
return __ceph_removexattr(dentry, name);
}