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OpenCloudOS-Kernel/fs/ceph/xattr.c

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// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/ceph/pagelist.h>
#include "super.h"
#include "mds_client.h"
#include <linux/ceph/decode.h>
#include <linux/xattr.h>
#include <linux/security.h>
#include <linux/posix_acl_xattr.h>
#include <linux/slab.h>
#define XATTR_CEPH_PREFIX "ceph."
#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
static int __remove_xattr(struct ceph_inode_info *ci,
struct ceph_inode_xattr *xattr);
static bool ceph_is_valid_xattr(const char *name)
{
return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
}
/*
* These define virtual xattrs exposing the recursive directory
* statistics and layout metadata.
*/
struct ceph_vxattr {
char *name;
size_t name_size; /* strlen(name) + 1 (for '\0') */
ssize_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
size_t size);
bool (*exists_cb)(struct ceph_inode_info *ci);
unsigned int flags;
};
#define VXATTR_FLAG_READONLY (1<<0)
#define VXATTR_FLAG_HIDDEN (1<<1)
#define VXATTR_FLAG_RSTAT (1<<2)
/* layouts */
static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
{
struct ceph_file_layout *fl = &ci->i_layout;
return (fl->stripe_unit > 0 || fl->stripe_count > 0 ||
fl->object_size > 0 || fl->pool_id >= 0 ||
rcu_dereference_raw(fl->pool_ns) != NULL);
}
static ssize_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
size_t size)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
struct ceph_osd_client *osdc = &fsc->client->osdc;
struct ceph_string *pool_ns;
s64 pool = ci->i_layout.pool_id;
const char *pool_name;
const char *ns_field = " pool_namespace=";
char buf[128];
size_t len, total_len = 0;
ssize_t ret;
pool_ns = ceph_try_get_string(ci->i_layout.pool_ns);
dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
down_read(&osdc->lock);
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
if (pool_name) {
len = snprintf(buf, sizeof(buf),
"stripe_unit=%u stripe_count=%u object_size=%u pool=",
ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
ci->i_layout.object_size);
total_len = len + strlen(pool_name);
} else {
len = snprintf(buf, sizeof(buf),
"stripe_unit=%u stripe_count=%u object_size=%u pool=%lld",
ci->i_layout.stripe_unit, ci->i_layout.stripe_count,
ci->i_layout.object_size, pool);
total_len = len;
}
if (pool_ns)
total_len += strlen(ns_field) + pool_ns->len;
ret = total_len;
if (size >= total_len) {
memcpy(val, buf, len);
ret = len;
if (pool_name) {
len = strlen(pool_name);
memcpy(val + ret, pool_name, len);
ret += len;
}
if (pool_ns) {
len = strlen(ns_field);
memcpy(val + ret, ns_field, len);
ret += len;
memcpy(val + ret, pool_ns->str, pool_ns->len);
ret += pool_ns->len;
}
}
up_read(&osdc->lock);
ceph_put_string(pool_ns);
return ret;
}
/*
* The convention with strings in xattrs is that they should not be NULL
* terminated, since we're returning the length with them. snprintf always
* NULL terminates however, so call it on a temporary buffer and then memcpy
* the result into place.
*/
static int ceph_fmt_xattr(char *val, size_t size, const char *fmt, ...)
{
int ret;
va_list args;
char buf[96]; /* NB: reevaluate size if new vxattrs are added */
va_start(args, fmt);
ret = vsnprintf(buf, size ? sizeof(buf) : 0, fmt, args);
va_end(args);
/* Sanity check */
if (size && ret + 1 > sizeof(buf)) {
WARN_ONCE(true, "Returned length too big (%d)", ret);
return -E2BIG;
}
if (ret <= size)
memcpy(val, buf, ret);
return ret;
}
static ssize_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
char *val, size_t size)
{
return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_unit);
}
static ssize_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
char *val, size_t size)
{
return ceph_fmt_xattr(val, size, "%u", ci->i_layout.stripe_count);
}
static ssize_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
char *val, size_t size)
{
return ceph_fmt_xattr(val, size, "%u", ci->i_layout.object_size);
}
static ssize_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
char *val, size_t size)
{
ssize_t ret;
struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
struct ceph_osd_client *osdc = &fsc->client->osdc;
s64 pool = ci->i_layout.pool_id;
const char *pool_name;
down_read(&osdc->lock);
pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
if (pool_name) {
ret = strlen(pool_name);
if (ret <= size)
memcpy(val, pool_name, ret);
} else {
ret = ceph_fmt_xattr(val, size, "%lld", pool);
}
up_read(&osdc->lock);
return ret;
}
static ssize_t ceph_vxattrcb_layout_pool_namespace(struct ceph_inode_info *ci,
char *val, size_t size)
{
ssize_t ret = 0;
struct ceph_string *ns = ceph_try_get_string(ci->i_layout.pool_ns);
if (ns) {
ret = ns->len;
if (ret <= size)
memcpy(val, ns->str, ret);
ceph_put_string(ns);
}
return ret;
}
/* directories */
static ssize_t ceph_vxattrcb_dir_entries(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld", ci->i_files + ci->i_subdirs);
}
static ssize_t ceph_vxattrcb_dir_files(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld", ci->i_files);
}
static ssize_t ceph_vxattrcb_dir_subdirs(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld", ci->i_subdirs);
}
static ssize_t ceph_vxattrcb_dir_rentries(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld",
ci->i_rfiles + ci->i_rsubdirs);
}
static ssize_t ceph_vxattrcb_dir_rfiles(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld", ci->i_rfiles);
}
static ssize_t ceph_vxattrcb_dir_rsubdirs(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld", ci->i_rsubdirs);
}
static ssize_t ceph_vxattrcb_dir_rbytes(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld", ci->i_rbytes);
}
static ssize_t ceph_vxattrcb_dir_rctime(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_rctime.tv_sec,
ci->i_rctime.tv_nsec);
}
/* dir pin */
static bool ceph_vxattrcb_dir_pin_exists(struct ceph_inode_info *ci)
{
return ci->i_dir_pin != -ENODATA;
}
static ssize_t ceph_vxattrcb_dir_pin(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%d", (int)ci->i_dir_pin);
}
/* quotas */
static bool ceph_vxattrcb_quota_exists(struct ceph_inode_info *ci)
{
bool ret = false;
spin_lock(&ci->i_ceph_lock);
if ((ci->i_max_files || ci->i_max_bytes) &&
ci->i_vino.snap == CEPH_NOSNAP &&
ci->i_snap_realm &&
ci->i_snap_realm->ino == ci->i_vino.ino)
ret = true;
spin_unlock(&ci->i_ceph_lock);
return ret;
}
static ssize_t ceph_vxattrcb_quota(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "max_bytes=%llu max_files=%llu",
ci->i_max_bytes, ci->i_max_files);
}
static ssize_t ceph_vxattrcb_quota_max_bytes(struct ceph_inode_info *ci,
char *val, size_t size)
{
return ceph_fmt_xattr(val, size, "%llu", ci->i_max_bytes);
}
static ssize_t ceph_vxattrcb_quota_max_files(struct ceph_inode_info *ci,
char *val, size_t size)
{
return ceph_fmt_xattr(val, size, "%llu", ci->i_max_files);
}
/* snapshots */
static bool ceph_vxattrcb_snap_btime_exists(struct ceph_inode_info *ci)
{
return (ci->i_snap_btime.tv_sec != 0 || ci->i_snap_btime.tv_nsec != 0);
}
static ssize_t ceph_vxattrcb_snap_btime(struct ceph_inode_info *ci, char *val,
size_t size)
{
return ceph_fmt_xattr(val, size, "%lld.%09ld", ci->i_snap_btime.tv_sec,
ci->i_snap_btime.tv_nsec);
}
#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
#define CEPH_XATTR_NAME2(_type, _name, _name2) \
XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
#define XATTR_NAME_CEPH(_type, _name, _flags) \
{ \
.name = CEPH_XATTR_NAME(_type, _name), \
.name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
.getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
.exists_cb = NULL, \
.flags = (VXATTR_FLAG_READONLY | _flags), \
}
#define XATTR_RSTAT_FIELD(_type, _name) \
XATTR_NAME_CEPH(_type, _name, VXATTR_FLAG_RSTAT)
#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
{ \
.name = CEPH_XATTR_NAME2(_type, _name, _field), \
.name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
.getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
.exists_cb = ceph_vxattrcb_layout_exists, \
.flags = VXATTR_FLAG_HIDDEN, \
}
#define XATTR_QUOTA_FIELD(_type, _name) \
{ \
.name = CEPH_XATTR_NAME(_type, _name), \
.name_size = sizeof(CEPH_XATTR_NAME(_type, _name)), \
.getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
.exists_cb = ceph_vxattrcb_quota_exists, \
.flags = VXATTR_FLAG_HIDDEN, \
}
static struct ceph_vxattr ceph_dir_vxattrs[] = {
{
.name = "ceph.dir.layout",
.name_size = sizeof("ceph.dir.layout"),
.getxattr_cb = ceph_vxattrcb_layout,
.exists_cb = ceph_vxattrcb_layout_exists,
.flags = VXATTR_FLAG_HIDDEN,
},
XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
XATTR_LAYOUT_FIELD(dir, layout, object_size),
XATTR_LAYOUT_FIELD(dir, layout, pool),
XATTR_LAYOUT_FIELD(dir, layout, pool_namespace),
XATTR_NAME_CEPH(dir, entries, 0),
XATTR_NAME_CEPH(dir, files, 0),
XATTR_NAME_CEPH(dir, subdirs, 0),
XATTR_RSTAT_FIELD(dir, rentries),
XATTR_RSTAT_FIELD(dir, rfiles),
XATTR_RSTAT_FIELD(dir, rsubdirs),
XATTR_RSTAT_FIELD(dir, rbytes),
XATTR_RSTAT_FIELD(dir, rctime),
{
.name = "ceph.dir.pin",
.name_size = sizeof("ceph.dir.pin"),
.getxattr_cb = ceph_vxattrcb_dir_pin,
.exists_cb = ceph_vxattrcb_dir_pin_exists,
.flags = VXATTR_FLAG_HIDDEN,
},
{
.name = "ceph.quota",
.name_size = sizeof("ceph.quota"),
.getxattr_cb = ceph_vxattrcb_quota,
.exists_cb = ceph_vxattrcb_quota_exists,
.flags = VXATTR_FLAG_HIDDEN,
},
XATTR_QUOTA_FIELD(quota, max_bytes),
XATTR_QUOTA_FIELD(quota, max_files),
{
.name = "ceph.snap.btime",
.name_size = sizeof("ceph.snap.btime"),
.getxattr_cb = ceph_vxattrcb_snap_btime,
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
{ .name = NULL, 0 } /* Required table terminator */
};
/* files */
static struct ceph_vxattr ceph_file_vxattrs[] = {
{
.name = "ceph.file.layout",
.name_size = sizeof("ceph.file.layout"),
.getxattr_cb = ceph_vxattrcb_layout,
.exists_cb = ceph_vxattrcb_layout_exists,
.flags = VXATTR_FLAG_HIDDEN,
},
XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
XATTR_LAYOUT_FIELD(file, layout, stripe_count),
XATTR_LAYOUT_FIELD(file, layout, object_size),
XATTR_LAYOUT_FIELD(file, layout, pool),
XATTR_LAYOUT_FIELD(file, layout, pool_namespace),
{
.name = "ceph.snap.btime",
.name_size = sizeof("ceph.snap.btime"),
.getxattr_cb = ceph_vxattrcb_snap_btime,
.exists_cb = ceph_vxattrcb_snap_btime_exists,
.flags = VXATTR_FLAG_READONLY,
},
{ .name = NULL, 0 } /* Required table terminator */
};
static struct ceph_vxattr *ceph_inode_vxattrs(struct inode *inode)
{
if (S_ISDIR(inode->i_mode))
return ceph_dir_vxattrs;
else if (S_ISREG(inode->i_mode))
return ceph_file_vxattrs;
return NULL;
}
static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
const char *name)
{
struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
if (vxattr) {
while (vxattr->name) {
if (!strcmp(vxattr->name, name))
return vxattr;
vxattr++;
}
}
return NULL;
}
static int __set_xattr(struct ceph_inode_info *ci,
const char *name, int name_len,
const char *val, int val_len,
int flags, int update_xattr,
struct ceph_inode_xattr **newxattr)
{
struct rb_node **p;
struct rb_node *parent = NULL;
struct ceph_inode_xattr *xattr = NULL;
int c;
int new = 0;
p = &ci->i_xattrs.index.rb_node;
while (*p) {
parent = *p;
xattr = rb_entry(parent, struct ceph_inode_xattr, node);
c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)
p = &(*p)->rb_right;
else {
if (name_len == xattr->name_len)
break;
else if (name_len < xattr->name_len)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
}
xattr = NULL;
}
if (update_xattr) {
int err = 0;
if (xattr && (flags & XATTR_CREATE))
err = -EEXIST;
else if (!xattr && (flags & XATTR_REPLACE))
err = -ENODATA;
if (err) {
kfree(name);
kfree(val);
kfree(*newxattr);
return err;
}
if (update_xattr < 0) {
if (xattr)
__remove_xattr(ci, xattr);
kfree(name);
kfree(*newxattr);
return 0;
}
}
if (!xattr) {
new = 1;
xattr = *newxattr;
xattr->name = name;
xattr->name_len = name_len;
xattr->should_free_name = update_xattr;
ci->i_xattrs.count++;
dout("__set_xattr count=%d\n", ci->i_xattrs.count);
} else {
kfree(*newxattr);
*newxattr = NULL;
if (xattr->should_free_val)
kfree((void *)xattr->val);
if (update_xattr) {
kfree((void *)name);
name = xattr->name;
}
ci->i_xattrs.names_size -= xattr->name_len;
ci->i_xattrs.vals_size -= xattr->val_len;
}
ci->i_xattrs.names_size += name_len;
ci->i_xattrs.vals_size += val_len;
if (val)
xattr->val = val;
else
xattr->val = "";
xattr->val_len = val_len;
xattr->dirty = update_xattr;
xattr->should_free_val = (val && update_xattr);
if (new) {
rb_link_node(&xattr->node, parent, p);
rb_insert_color(&xattr->node, &ci->i_xattrs.index);
dout("__set_xattr_val p=%p\n", p);
}
dout("__set_xattr_val added %llx.%llx xattr %p %.*s=%.*s\n",
ceph_vinop(&ci->vfs_inode), xattr, name_len, name, val_len, val);
return 0;
}
static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
const char *name)
{
struct rb_node **p;
struct rb_node *parent = NULL;
struct ceph_inode_xattr *xattr = NULL;
int name_len = strlen(name);
int c;
p = &ci->i_xattrs.index.rb_node;
while (*p) {
parent = *p;
xattr = rb_entry(parent, struct ceph_inode_xattr, node);
c = strncmp(name, xattr->name, xattr->name_len);
if (c == 0 && name_len > xattr->name_len)
c = 1;
if (c < 0)
p = &(*p)->rb_left;
else if (c > 0)
p = &(*p)->rb_right;
else {
dout("__get_xattr %s: found %.*s\n", name,
xattr->val_len, xattr->val);
return xattr;
}
}
dout("__get_xattr %s: not found\n", name);
return NULL;
}
static void __free_xattr(struct ceph_inode_xattr *xattr)
{
BUG_ON(!xattr);
if (xattr->should_free_name)
kfree((void *)xattr->name);
if (xattr->should_free_val)
kfree((void *)xattr->val);
kfree(xattr);
}
static int __remove_xattr(struct ceph_inode_info *ci,
struct ceph_inode_xattr *xattr)
{
if (!xattr)
return -ENODATA;
rb_erase(&xattr->node, &ci->i_xattrs.index);
if (xattr->should_free_name)
kfree((void *)xattr->name);
if (xattr->should_free_val)
kfree((void *)xattr->val);
ci->i_xattrs.names_size -= xattr->name_len;
ci->i_xattrs.vals_size -= xattr->val_len;
ci->i_xattrs.count--;
kfree(xattr);
return 0;
}
static char *__copy_xattr_names(struct ceph_inode_info *ci,
char *dest)
{
struct rb_node *p;
struct ceph_inode_xattr *xattr = NULL;
p = rb_first(&ci->i_xattrs.index);
dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
while (p) {
xattr = rb_entry(p, struct ceph_inode_xattr, node);
memcpy(dest, xattr->name, xattr->name_len);
dest[xattr->name_len] = '\0';
dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
xattr->name_len, ci->i_xattrs.names_size);
dest += xattr->name_len + 1;
p = rb_next(p);
}
return dest;
}
void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
{
struct rb_node *p, *tmp;
struct ceph_inode_xattr *xattr = NULL;
p = rb_first(&ci->i_xattrs.index);
dout("__ceph_destroy_xattrs p=%p\n", p);
while (p) {
xattr = rb_entry(p, struct ceph_inode_xattr, node);
tmp = p;
p = rb_next(tmp);
dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
xattr->name_len, xattr->name);
rb_erase(tmp, &ci->i_xattrs.index);
__free_xattr(xattr);
}
ci->i_xattrs.names_size = 0;
ci->i_xattrs.vals_size = 0;
ci->i_xattrs.index_version = 0;
ci->i_xattrs.count = 0;
ci->i_xattrs.index = RB_ROOT;
}
static int __build_xattrs(struct inode *inode)
__releases(ci->i_ceph_lock)
__acquires(ci->i_ceph_lock)
{
u32 namelen;
u32 numattr = 0;
void *p, *end;
u32 len;
const char *name, *val;
struct ceph_inode_info *ci = ceph_inode(inode);
int xattr_version;
struct ceph_inode_xattr **xattrs = NULL;
int err = 0;
int i;
dout("__build_xattrs() len=%d\n",
ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
return 0; /* already built */
__ceph_destroy_xattrs(ci);
start:
/* updated internal xattr rb tree */
if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
p = ci->i_xattrs.blob->vec.iov_base;
end = p + ci->i_xattrs.blob->vec.iov_len;
ceph_decode_32_safe(&p, end, numattr, bad);
xattr_version = ci->i_xattrs.version;
spin_unlock(&ci->i_ceph_lock);
xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
GFP_NOFS);
err = -ENOMEM;
if (!xattrs)
goto bad_lock;
for (i = 0; i < numattr; i++) {
xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
GFP_NOFS);
if (!xattrs[i])
goto bad_lock;
}
spin_lock(&ci->i_ceph_lock);
if (ci->i_xattrs.version != xattr_version) {
/* lost a race, retry */
for (i = 0; i < numattr; i++)
kfree(xattrs[i]);
kfree(xattrs);
xattrs = NULL;
goto start;
}
err = -EIO;
while (numattr--) {
ceph_decode_32_safe(&p, end, len, bad);
namelen = len;
name = p;
p += len;
ceph_decode_32_safe(&p, end, len, bad);
val = p;
p += len;
err = __set_xattr(ci, name, namelen, val, len,
0, 0, &xattrs[numattr]);
if (err < 0)
goto bad;
}
kfree(xattrs);
}
ci->i_xattrs.index_version = ci->i_xattrs.version;
ci->i_xattrs.dirty = false;
return err;
bad_lock:
spin_lock(&ci->i_ceph_lock);
bad:
if (xattrs) {
for (i = 0; i < numattr; i++)
kfree(xattrs[i]);
kfree(xattrs);
}
ci->i_xattrs.names_size = 0;
return err;
}
static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
int val_size)
{
/*
* 4 bytes for the length, and additional 4 bytes per each xattr name,
* 4 bytes per each value
*/
int size = 4 + ci->i_xattrs.count*(4 + 4) +
ci->i_xattrs.names_size +
ci->i_xattrs.vals_size;
dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
ci->i_xattrs.count, ci->i_xattrs.names_size,
ci->i_xattrs.vals_size);
if (name_size)
size += 4 + 4 + name_size + val_size;
return size;
}
/*
* If there are dirty xattrs, reencode xattrs into the prealloc_blob
* and swap into place. It returns the old i_xattrs.blob (or NULL) so
* that it can be freed by the caller as the i_ceph_lock is likely to be
* held.
*/
struct ceph_buffer *__ceph_build_xattrs_blob(struct ceph_inode_info *ci)
{
struct rb_node *p;
struct ceph_inode_xattr *xattr = NULL;
struct ceph_buffer *old_blob = NULL;
void *dest;
dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
if (ci->i_xattrs.dirty) {
int need = __get_required_blob_size(ci, 0, 0);
BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
p = rb_first(&ci->i_xattrs.index);
dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
ceph_encode_32(&dest, ci->i_xattrs.count);
while (p) {
xattr = rb_entry(p, struct ceph_inode_xattr, node);
ceph_encode_32(&dest, xattr->name_len);
memcpy(dest, xattr->name, xattr->name_len);
dest += xattr->name_len;
ceph_encode_32(&dest, xattr->val_len);
memcpy(dest, xattr->val, xattr->val_len);
dest += xattr->val_len;
p = rb_next(p);
}
/* adjust buffer len; it may be larger than we need */
ci->i_xattrs.prealloc_blob->vec.iov_len =
dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
if (ci->i_xattrs.blob)
old_blob = ci->i_xattrs.blob;
ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
ci->i_xattrs.prealloc_blob = NULL;
ci->i_xattrs.dirty = false;
ci->i_xattrs.version++;
}
return old_blob;
}
static inline int __get_request_mask(struct inode *in) {
struct ceph_mds_request *req = current->journal_info;
int mask = 0;
if (req && req->r_target_inode == in) {
if (req->r_op == CEPH_MDS_OP_LOOKUP ||
req->r_op == CEPH_MDS_OP_LOOKUPINO ||
req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
req->r_op == CEPH_MDS_OP_GETATTR) {
mask = le32_to_cpu(req->r_args.getattr.mask);
} else if (req->r_op == CEPH_MDS_OP_OPEN ||
req->r_op == CEPH_MDS_OP_CREATE) {
mask = le32_to_cpu(req->r_args.open.mask);
}
}
return mask;
}
ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
size_t size)
{
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_inode_xattr *xattr;
struct ceph_vxattr *vxattr = NULL;
int req_mask;
ssize_t err;
/* let's see if a virtual xattr was requested */
vxattr = ceph_match_vxattr(inode, name);
if (vxattr) {
int mask = 0;
if (vxattr->flags & VXATTR_FLAG_RSTAT)
mask |= CEPH_STAT_RSTAT;
err = ceph_do_getattr(inode, mask, true);
if (err)
return err;
err = -ENODATA;
if (!(vxattr->exists_cb && !vxattr->exists_cb(ci))) {
err = vxattr->getxattr_cb(ci, value, size);
if (size && size < err)
err = -ERANGE;
}
return err;
}
req_mask = __get_request_mask(inode);
spin_lock(&ci->i_ceph_lock);
dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
ci->i_xattrs.version, ci->i_xattrs.index_version);
if (ci->i_xattrs.version == 0 ||
!((req_mask & CEPH_CAP_XATTR_SHARED) ||
__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1))) {
spin_unlock(&ci->i_ceph_lock);
/* security module gets xattr while filling trace */
if (current->journal_info) {
pr_warn_ratelimited("sync getxattr %p "
"during filling trace\n", inode);
return -EBUSY;
}
/* get xattrs from mds (if we don't already have them) */
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
if (err)
return err;
spin_lock(&ci->i_ceph_lock);
}
err = __build_xattrs(inode);
if (err < 0)
goto out;
err = -ENODATA; /* == ENOATTR */
xattr = __get_xattr(ci, name);
if (!xattr)
goto out;
err = -ERANGE;
if (size && size < xattr->val_len)
goto out;
err = xattr->val_len;
if (size == 0)
goto out;
memcpy(value, xattr->val, xattr->val_len);
if (current->journal_info &&
!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN))
ci->i_ceph_flags |= CEPH_I_SEC_INITED;
out:
spin_unlock(&ci->i_ceph_lock);
return err;
}
ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
{
struct inode *inode = d_inode(dentry);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_vxattr *vxattrs = ceph_inode_vxattrs(inode);
bool len_only = (size == 0);
u32 namelen;
int err;
int i;
spin_lock(&ci->i_ceph_lock);
dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
ci->i_xattrs.version, ci->i_xattrs.index_version);
if (ci->i_xattrs.version == 0 ||
!__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
spin_unlock(&ci->i_ceph_lock);
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
if (err)
return err;
spin_lock(&ci->i_ceph_lock);
}
err = __build_xattrs(inode);
if (err < 0)
goto out;
/* add 1 byte for each xattr due to the null termination */
namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
if (!len_only) {
if (namelen > size) {
err = -ERANGE;
goto out;
}
names = __copy_xattr_names(ci, names);
size -= namelen;
}
/* virtual xattr names, too */
if (vxattrs) {
for (i = 0; vxattrs[i].name; i++) {
size_t this_len;
if (vxattrs[i].flags & VXATTR_FLAG_HIDDEN)
continue;
if (vxattrs[i].exists_cb && !vxattrs[i].exists_cb(ci))
continue;
this_len = strlen(vxattrs[i].name) + 1;
namelen += this_len;
if (len_only)
continue;
if (this_len > size) {
err = -ERANGE;
goto out;
}
memcpy(names, vxattrs[i].name, this_len);
names += this_len;
size -= this_len;
}
}
err = namelen;
out:
spin_unlock(&ci->i_ceph_lock);
return err;
}
static int ceph_sync_setxattr(struct inode *inode, const char *name,
const char *value, size_t size, int flags)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_request *req;
struct ceph_mds_client *mdsc = fsc->mdsc;
struct ceph_pagelist *pagelist = NULL;
int op = CEPH_MDS_OP_SETXATTR;
int err;
if (size > 0) {
/* copy value into pagelist */
pagelist = ceph_pagelist_alloc(GFP_NOFS);
if (!pagelist)
return -ENOMEM;
err = ceph_pagelist_append(pagelist, value, size);
if (err)
goto out;
} else if (!value) {
if (flags & CEPH_XATTR_REPLACE)
op = CEPH_MDS_OP_RMXATTR;
else
flags |= CEPH_XATTR_REMOVE;
}
dout("setxattr value=%.*s\n", (int)size, value);
/* do request */
req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS);
if (IS_ERR(req)) {
err = PTR_ERR(req);
goto out;
}
req->r_path2 = kstrdup(name, GFP_NOFS);
if (!req->r_path2) {
ceph_mdsc_put_request(req);
err = -ENOMEM;
goto out;
}
if (op == CEPH_MDS_OP_SETXATTR) {
req->r_args.setxattr.flags = cpu_to_le32(flags);
req->r_pagelist = pagelist;
pagelist = NULL;
}
req->r_inode = inode;
ihold(inode);
req->r_num_caps = 1;
req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
err = ceph_mdsc_do_request(mdsc, NULL, req);
ceph_mdsc_put_request(req);
dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
out:
if (pagelist)
ceph_pagelist_release(pagelist);
return err;
}
int __ceph_setxattr(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
struct ceph_vxattr *vxattr;
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_cap_flush *prealloc_cf = NULL;
struct ceph_buffer *old_blob = NULL;
int issued;
int err;
int dirty = 0;
int name_len = strlen(name);
int val_len = size;
char *newname = NULL;
char *newval = NULL;
struct ceph_inode_xattr *xattr = NULL;
int required_blob_size;
bool check_realm = false;
bool lock_snap_rwsem = false;
if (ceph_snap(inode) != CEPH_NOSNAP)
return -EROFS;
vxattr = ceph_match_vxattr(inode, name);
if (vxattr) {
if (vxattr->flags & VXATTR_FLAG_READONLY)
return -EOPNOTSUPP;
if (value && !strncmp(vxattr->name, "ceph.quota", 10))
check_realm = true;
}
/* pass any unhandled ceph.* xattrs through to the MDS */
if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
goto do_sync_unlocked;
/* preallocate memory for xattr name, value, index node */
err = -ENOMEM;
newname = kmemdup(name, name_len + 1, GFP_NOFS);
if (!newname)
goto out;
if (val_len) {
newval = kmemdup(value, val_len, GFP_NOFS);
if (!newval)
goto out;
}
xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
if (!xattr)
goto out;
prealloc_cf = ceph_alloc_cap_flush();
if (!prealloc_cf)
goto out;
spin_lock(&ci->i_ceph_lock);
retry:
issued = __ceph_caps_issued(ci, NULL);
if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
if (!lock_snap_rwsem && !ci->i_head_snapc) {
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);
goto retry;
}
}
dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
__build_xattrs(inode);
required_blob_size = __get_required_blob_size(ci, name_len, val_len);
if (!ci->i_xattrs.prealloc_blob ||
required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
struct ceph_buffer *blob;
spin_unlock(&ci->i_ceph_lock);
ceph_buffer_put(old_blob); /* Shouldn't be required */
dout(" pre-allocating new blob size=%d\n", required_blob_size);
blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
if (!blob)
goto do_sync_unlocked;
spin_lock(&ci->i_ceph_lock);
/* prealloc_blob can't be released while holding i_ceph_lock */
if (ci->i_xattrs.prealloc_blob)
old_blob = ci->i_xattrs.prealloc_blob;
ci->i_xattrs.prealloc_blob = blob;
goto retry;
}
err = __set_xattr(ci, newname, name_len, newval, val_len,
flags, value ? 1 : -1, &xattr);
if (!err) {
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
&prealloc_cf);
ci->i_xattrs.dirty = true;
inode->i_ctime = current_time(inode);
}
spin_unlock(&ci->i_ceph_lock);
ceph_buffer_put(old_blob);
if (lock_snap_rwsem)
up_read(&mdsc->snap_rwsem);
if (dirty)
__mark_inode_dirty(inode, dirty);
ceph_free_cap_flush(prealloc_cf);
return err;
do_sync:
spin_unlock(&ci->i_ceph_lock);
do_sync_unlocked:
if (lock_snap_rwsem)
up_read(&mdsc->snap_rwsem);
/* security module set xattr while filling trace */
if (current->journal_info) {
pr_warn_ratelimited("sync setxattr %p "
"during filling trace\n", inode);
err = -EBUSY;
} else {
err = ceph_sync_setxattr(inode, name, value, size, flags);
if (err >= 0 && check_realm) {
/* check if snaprealm was created for quota inode */
spin_lock(&ci->i_ceph_lock);
if ((ci->i_max_files || ci->i_max_bytes) &&
!(ci->i_snap_realm &&
ci->i_snap_realm->ino == ci->i_vino.ino))
err = -EOPNOTSUPP;
spin_unlock(&ci->i_ceph_lock);
}
}
out:
ceph_free_cap_flush(prealloc_cf);
kfree(newname);
kfree(newval);
kfree(xattr);
return err;
}
static int ceph_get_xattr_handler(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size)
{
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
return __ceph_getxattr(inode, name, value, size);
}
static int ceph_set_xattr_handler(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *name, const void *value,
size_t size, int flags)
{
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
return __ceph_setxattr(inode, name, value, size, flags);
}
static const struct xattr_handler ceph_other_xattr_handler = {
.prefix = "", /* match any name => handlers called with full name */
.get = ceph_get_xattr_handler,
.set = ceph_set_xattr_handler,
};
#ifdef CONFIG_SECURITY
bool ceph_security_xattr_wanted(struct inode *in)
{
return in->i_security != NULL;
}
bool ceph_security_xattr_deadlock(struct inode *in)
{
struct ceph_inode_info *ci;
bool ret;
if (!in->i_security)
return false;
ci = ceph_inode(in);
spin_lock(&ci->i_ceph_lock);
ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
!(ci->i_xattrs.version > 0 &&
__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
spin_unlock(&ci->i_ceph_lock);
return ret;
}
#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
int ceph_security_init_secctx(struct dentry *dentry, umode_t mode,
struct ceph_acl_sec_ctx *as_ctx)
{
struct ceph_pagelist *pagelist = as_ctx->pagelist;
const char *name;
size_t name_len;
int err;
err = security_dentry_init_security(dentry, mode, &dentry->d_name,
&as_ctx->sec_ctx,
&as_ctx->sec_ctxlen);
if (err < 0) {
WARN_ON_ONCE(err != -EOPNOTSUPP);
err = 0; /* do nothing */
goto out;
}
err = -ENOMEM;
if (!pagelist) {
pagelist = ceph_pagelist_alloc(GFP_KERNEL);
if (!pagelist)
goto out;
err = ceph_pagelist_reserve(pagelist, PAGE_SIZE);
if (err)
goto out;
ceph_pagelist_encode_32(pagelist, 1);
}
/*
* FIXME: Make security_dentry_init_security() generic. Currently
* It only supports single security module and only selinux has
* dentry_init_security hook.
*/
name = XATTR_NAME_SELINUX;
name_len = strlen(name);
err = ceph_pagelist_reserve(pagelist,
4 * 2 + name_len + as_ctx->sec_ctxlen);
if (err)
goto out;
if (as_ctx->pagelist) {
/* update count of KV pairs */
BUG_ON(pagelist->length <= sizeof(__le32));
if (list_is_singular(&pagelist->head)) {
le32_add_cpu((__le32*)pagelist->mapped_tail, 1);
} else {
struct page *page = list_first_entry(&pagelist->head,
struct page, lru);
void *addr = kmap_atomic(page);
le32_add_cpu((__le32*)addr, 1);
kunmap_atomic(addr);
}
} else {
as_ctx->pagelist = pagelist;
}
ceph_pagelist_encode_32(pagelist, name_len);
ceph_pagelist_append(pagelist, name, name_len);
ceph_pagelist_encode_32(pagelist, as_ctx->sec_ctxlen);
ceph_pagelist_append(pagelist, as_ctx->sec_ctx, as_ctx->sec_ctxlen);
err = 0;
out:
if (pagelist && !as_ctx->pagelist)
ceph_pagelist_release(pagelist);
return err;
}
void ceph_security_invalidate_secctx(struct inode *inode)
{
security_inode_invalidate_secctx(inode);
}
static int ceph_xattr_set_security_label(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *key, const void *buf,
size_t buflen, int flags)
{
if (security_ismaclabel(key)) {
const char *name = xattr_full_name(handler, key);
return __ceph_setxattr(inode, name, buf, buflen, flags);
}
return -EOPNOTSUPP;
}
static int ceph_xattr_get_security_label(const struct xattr_handler *handler,
struct dentry *unused, struct inode *inode,
const char *key, void *buf, size_t buflen)
{
if (security_ismaclabel(key)) {
const char *name = xattr_full_name(handler, key);
return __ceph_getxattr(inode, name, buf, buflen);
}
return -EOPNOTSUPP;
}
static const struct xattr_handler ceph_security_label_handler = {
.prefix = XATTR_SECURITY_PREFIX,
.get = ceph_xattr_get_security_label,
.set = ceph_xattr_set_security_label,
};
#endif
#endif
void ceph_release_acl_sec_ctx(struct ceph_acl_sec_ctx *as_ctx)
{
#ifdef CONFIG_CEPH_FS_POSIX_ACL
posix_acl_release(as_ctx->acl);
posix_acl_release(as_ctx->default_acl);
#endif
#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
security_release_secctx(as_ctx->sec_ctx, as_ctx->sec_ctxlen);
#endif
if (as_ctx->pagelist)
ceph_pagelist_release(as_ctx->pagelist);
}
/*
* 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
&posix_acl_access_xattr_handler,
&posix_acl_default_xattr_handler,
#endif
#ifdef CONFIG_CEPH_FS_SECURITY_LABEL
&ceph_security_label_handler,
#endif
&ceph_other_xattr_handler,
NULL,
};
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