forked from rrcarlosr/Jetpack
457 lines
12 KiB
C
457 lines
12 KiB
C
/*
|
|
* (C) 2001 Clemson University and The University of Chicago
|
|
*
|
|
* See COPYING in top-level directory.
|
|
*/
|
|
|
|
/*
|
|
* Linux VFS extended attribute operations.
|
|
*/
|
|
|
|
#include "protocol.h"
|
|
#include "orangefs-kernel.h"
|
|
#include "orangefs-bufmap.h"
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/xattr.h>
|
|
|
|
|
|
#define SYSTEM_ORANGEFS_KEY "system.pvfs2."
|
|
#define SYSTEM_ORANGEFS_KEY_LEN 13
|
|
|
|
/*
|
|
* this function returns
|
|
* 0 if the key corresponding to name is not meant to be printed as part
|
|
* of a listxattr.
|
|
* 1 if the key corresponding to name is meant to be returned as part of
|
|
* a listxattr.
|
|
* The ones that start SYSTEM_ORANGEFS_KEY are the ones to avoid printing.
|
|
*/
|
|
static int is_reserved_key(const char *key, size_t size)
|
|
{
|
|
|
|
if (size < SYSTEM_ORANGEFS_KEY_LEN)
|
|
return 1;
|
|
|
|
return strncmp(key, SYSTEM_ORANGEFS_KEY, SYSTEM_ORANGEFS_KEY_LEN) ? 1 : 0;
|
|
}
|
|
|
|
static inline int convert_to_internal_xattr_flags(int setxattr_flags)
|
|
{
|
|
int internal_flag = 0;
|
|
|
|
if (setxattr_flags & XATTR_REPLACE) {
|
|
/* Attribute must exist! */
|
|
internal_flag = ORANGEFS_XATTR_REPLACE;
|
|
} else if (setxattr_flags & XATTR_CREATE) {
|
|
/* Attribute must not exist */
|
|
internal_flag = ORANGEFS_XATTR_CREATE;
|
|
}
|
|
return internal_flag;
|
|
}
|
|
|
|
|
|
/*
|
|
* Tries to get a specified key's attributes of a given
|
|
* file into a user-specified buffer. Note that the getxattr
|
|
* interface allows for the users to probe the size of an
|
|
* extended attribute by passing in a value of 0 to size.
|
|
* Thus our return value is always the size of the attribute
|
|
* unless the key does not exist for the file and/or if
|
|
* there were errors in fetching the attribute value.
|
|
*/
|
|
ssize_t orangefs_inode_getxattr(struct inode *inode, const char *name,
|
|
void *buffer, size_t size)
|
|
{
|
|
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
|
|
struct orangefs_kernel_op_s *new_op = NULL;
|
|
ssize_t ret = -ENOMEM;
|
|
ssize_t length = 0;
|
|
int fsuid;
|
|
int fsgid;
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"%s: name %s, buffer_size %zd\n",
|
|
__func__, name, size);
|
|
|
|
if (S_ISLNK(inode->i_mode))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
|
|
return -EINVAL;
|
|
|
|
fsuid = from_kuid(&init_user_ns, current_fsuid());
|
|
fsgid = from_kgid(&init_user_ns, current_fsgid());
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"getxattr on inode %pU, name %s "
|
|
"(uid %o, gid %o)\n",
|
|
get_khandle_from_ino(inode),
|
|
name,
|
|
fsuid,
|
|
fsgid);
|
|
|
|
down_read(&orangefs_inode->xattr_sem);
|
|
|
|
new_op = op_alloc(ORANGEFS_VFS_OP_GETXATTR);
|
|
if (!new_op)
|
|
goto out_unlock;
|
|
|
|
new_op->upcall.req.getxattr.refn = orangefs_inode->refn;
|
|
strcpy(new_op->upcall.req.getxattr.key, name);
|
|
|
|
/*
|
|
* NOTE: Although keys are meant to be NULL terminated textual
|
|
* strings, I am going to explicitly pass the length just in case
|
|
* we change this later on...
|
|
*/
|
|
new_op->upcall.req.getxattr.key_sz = strlen(name) + 1;
|
|
|
|
ret = service_operation(new_op, "orangefs_inode_getxattr",
|
|
get_interruptible_flag(inode));
|
|
if (ret != 0) {
|
|
if (ret == -ENOENT) {
|
|
ret = -ENODATA;
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"orangefs_inode_getxattr: inode %pU key %s"
|
|
" does not exist!\n",
|
|
get_khandle_from_ino(inode),
|
|
(char *)new_op->upcall.req.getxattr.key);
|
|
}
|
|
goto out_release_op;
|
|
}
|
|
|
|
/*
|
|
* Length returned includes null terminator.
|
|
*/
|
|
length = new_op->downcall.resp.getxattr.val_sz;
|
|
|
|
/*
|
|
* Just return the length of the queried attribute.
|
|
*/
|
|
if (size == 0) {
|
|
ret = length;
|
|
goto out_release_op;
|
|
}
|
|
|
|
/*
|
|
* Check to see if key length is > provided buffer size.
|
|
*/
|
|
if (length > size) {
|
|
ret = -ERANGE;
|
|
goto out_release_op;
|
|
}
|
|
|
|
memcpy(buffer, new_op->downcall.resp.getxattr.val, length);
|
|
memset(buffer + length, 0, size - length);
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"orangefs_inode_getxattr: inode %pU "
|
|
"key %s key_sz %d, val_len %d\n",
|
|
get_khandle_from_ino(inode),
|
|
(char *)new_op->
|
|
upcall.req.getxattr.key,
|
|
(int)new_op->
|
|
upcall.req.getxattr.key_sz,
|
|
(int)ret);
|
|
|
|
ret = length;
|
|
|
|
out_release_op:
|
|
op_release(new_op);
|
|
out_unlock:
|
|
up_read(&orangefs_inode->xattr_sem);
|
|
return ret;
|
|
}
|
|
|
|
static int orangefs_inode_removexattr(struct inode *inode, const char *name,
|
|
int flags)
|
|
{
|
|
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
|
|
struct orangefs_kernel_op_s *new_op = NULL;
|
|
int ret = -ENOMEM;
|
|
|
|
if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
|
|
return -EINVAL;
|
|
|
|
down_write(&orangefs_inode->xattr_sem);
|
|
new_op = op_alloc(ORANGEFS_VFS_OP_REMOVEXATTR);
|
|
if (!new_op)
|
|
goto out_unlock;
|
|
|
|
new_op->upcall.req.removexattr.refn = orangefs_inode->refn;
|
|
/*
|
|
* NOTE: Although keys are meant to be NULL terminated
|
|
* textual strings, I am going to explicitly pass the
|
|
* length just in case we change this later on...
|
|
*/
|
|
strcpy(new_op->upcall.req.removexattr.key, name);
|
|
new_op->upcall.req.removexattr.key_sz = strlen(name) + 1;
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"orangefs_inode_removexattr: key %s, key_sz %d\n",
|
|
(char *)new_op->upcall.req.removexattr.key,
|
|
(int)new_op->upcall.req.removexattr.key_sz);
|
|
|
|
ret = service_operation(new_op,
|
|
"orangefs_inode_removexattr",
|
|
get_interruptible_flag(inode));
|
|
if (ret == -ENOENT) {
|
|
/*
|
|
* Request to replace a non-existent attribute is an error.
|
|
*/
|
|
if (flags & XATTR_REPLACE)
|
|
ret = -ENODATA;
|
|
else
|
|
ret = 0;
|
|
}
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"orangefs_inode_removexattr: returning %d\n", ret);
|
|
|
|
op_release(new_op);
|
|
out_unlock:
|
|
up_write(&orangefs_inode->xattr_sem);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Tries to set an attribute for a given key on a file.
|
|
*
|
|
* Returns a -ve number on error and 0 on success. Key is text, but value
|
|
* can be binary!
|
|
*/
|
|
int orangefs_inode_setxattr(struct inode *inode, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
|
|
struct orangefs_kernel_op_s *new_op;
|
|
int internal_flag = 0;
|
|
int ret = -ENOMEM;
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"%s: name %s, buffer_size %zd\n",
|
|
__func__, name, size);
|
|
|
|
if (size > ORANGEFS_MAX_XATTR_VALUELEN)
|
|
return -EINVAL;
|
|
if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
|
|
return -EINVAL;
|
|
|
|
internal_flag = convert_to_internal_xattr_flags(flags);
|
|
|
|
/* This is equivalent to a removexattr */
|
|
if (size == 0 && value == NULL) {
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"removing xattr (%s)\n",
|
|
name);
|
|
return orangefs_inode_removexattr(inode, name, flags);
|
|
}
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"setxattr on inode %pU, name %s\n",
|
|
get_khandle_from_ino(inode),
|
|
name);
|
|
|
|
down_write(&orangefs_inode->xattr_sem);
|
|
new_op = op_alloc(ORANGEFS_VFS_OP_SETXATTR);
|
|
if (!new_op)
|
|
goto out_unlock;
|
|
|
|
|
|
new_op->upcall.req.setxattr.refn = orangefs_inode->refn;
|
|
new_op->upcall.req.setxattr.flags = internal_flag;
|
|
/*
|
|
* NOTE: Although keys are meant to be NULL terminated textual
|
|
* strings, I am going to explicitly pass the length just in
|
|
* case we change this later on...
|
|
*/
|
|
strcpy(new_op->upcall.req.setxattr.keyval.key, name);
|
|
new_op->upcall.req.setxattr.keyval.key_sz = strlen(name) + 1;
|
|
memcpy(new_op->upcall.req.setxattr.keyval.val, value, size);
|
|
new_op->upcall.req.setxattr.keyval.val_sz = size;
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"orangefs_inode_setxattr: key %s, key_sz %d "
|
|
" value size %zd\n",
|
|
(char *)new_op->upcall.req.setxattr.keyval.key,
|
|
(int)new_op->upcall.req.setxattr.keyval.key_sz,
|
|
size);
|
|
|
|
ret = service_operation(new_op,
|
|
"orangefs_inode_setxattr",
|
|
get_interruptible_flag(inode));
|
|
|
|
gossip_debug(GOSSIP_XATTR_DEBUG,
|
|
"orangefs_inode_setxattr: returning %d\n",
|
|
ret);
|
|
|
|
/* when request is serviced properly, free req op struct */
|
|
op_release(new_op);
|
|
out_unlock:
|
|
up_write(&orangefs_inode->xattr_sem);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Tries to get a specified object's keys into a user-specified buffer of a
|
|
* given size. Note that like the previous instances of xattr routines, this
|
|
* also allows you to pass in a NULL pointer and 0 size to probe the size for
|
|
* subsequent memory allocations. Thus our return value is always the size of
|
|
* all the keys unless there were errors in fetching the keys!
|
|
*/
|
|
ssize_t orangefs_listxattr(struct dentry *dentry, char *buffer, size_t size)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
|
|
struct orangefs_kernel_op_s *new_op;
|
|
__u64 token = ORANGEFS_ITERATE_START;
|
|
ssize_t ret = -ENOMEM;
|
|
ssize_t total = 0;
|
|
int count_keys = 0;
|
|
int key_size;
|
|
int i = 0;
|
|
int returned_count = 0;
|
|
|
|
if (size > 0 && buffer == NULL) {
|
|
gossip_err("%s: bogus NULL pointers\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
down_read(&orangefs_inode->xattr_sem);
|
|
new_op = op_alloc(ORANGEFS_VFS_OP_LISTXATTR);
|
|
if (!new_op)
|
|
goto out_unlock;
|
|
|
|
if (buffer && size > 0)
|
|
memset(buffer, 0, size);
|
|
|
|
try_again:
|
|
key_size = 0;
|
|
new_op->upcall.req.listxattr.refn = orangefs_inode->refn;
|
|
new_op->upcall.req.listxattr.token = token;
|
|
new_op->upcall.req.listxattr.requested_count =
|
|
(size == 0) ? 0 : ORANGEFS_MAX_XATTR_LISTLEN;
|
|
ret = service_operation(new_op, __func__,
|
|
get_interruptible_flag(inode));
|
|
if (ret != 0)
|
|
goto done;
|
|
|
|
if (size == 0) {
|
|
/*
|
|
* This is a bit of a big upper limit, but I did not want to
|
|
* spend too much time getting this correct, since users end
|
|
* up allocating memory rather than us...
|
|
*/
|
|
total = new_op->downcall.resp.listxattr.returned_count *
|
|
ORANGEFS_MAX_XATTR_NAMELEN;
|
|
goto done;
|
|
}
|
|
|
|
returned_count = new_op->downcall.resp.listxattr.returned_count;
|
|
if (returned_count < 0 ||
|
|
returned_count > ORANGEFS_MAX_XATTR_LISTLEN) {
|
|
gossip_err("%s: impossible value for returned_count:%d:\n",
|
|
__func__,
|
|
returned_count);
|
|
ret = -EIO;
|
|
goto done;
|
|
}
|
|
|
|
/*
|
|
* Check to see how much can be fit in the buffer. Fit only whole keys.
|
|
*/
|
|
for (i = 0; i < returned_count; i++) {
|
|
if (new_op->downcall.resp.listxattr.lengths[i] < 0 ||
|
|
new_op->downcall.resp.listxattr.lengths[i] >
|
|
ORANGEFS_MAX_XATTR_NAMELEN) {
|
|
gossip_err("%s: impossible value for lengths[%d]\n",
|
|
__func__,
|
|
new_op->downcall.resp.listxattr.lengths[i]);
|
|
ret = -EIO;
|
|
goto done;
|
|
}
|
|
if (total + new_op->downcall.resp.listxattr.lengths[i] > size)
|
|
goto done;
|
|
|
|
/*
|
|
* Since many dumb programs try to setxattr() on our reserved
|
|
* xattrs this is a feeble attempt at defeating those by not
|
|
* listing them in the output of listxattr.. sigh
|
|
*/
|
|
if (is_reserved_key(new_op->downcall.resp.listxattr.key +
|
|
key_size,
|
|
new_op->downcall.resp.
|
|
listxattr.lengths[i])) {
|
|
gossip_debug(GOSSIP_XATTR_DEBUG, "Copying key %d -> %s\n",
|
|
i, new_op->downcall.resp.listxattr.key +
|
|
key_size);
|
|
memcpy(buffer + total,
|
|
new_op->downcall.resp.listxattr.key + key_size,
|
|
new_op->downcall.resp.listxattr.lengths[i]);
|
|
total += new_op->downcall.resp.listxattr.lengths[i];
|
|
count_keys++;
|
|
} else {
|
|
gossip_debug(GOSSIP_XATTR_DEBUG, "[RESERVED] key %d -> %s\n",
|
|
i, new_op->downcall.resp.listxattr.key +
|
|
key_size);
|
|
}
|
|
key_size += new_op->downcall.resp.listxattr.lengths[i];
|
|
}
|
|
|
|
/*
|
|
* Since the buffer was large enough, we might have to continue
|
|
* fetching more keys!
|
|
*/
|
|
token = new_op->downcall.resp.listxattr.token;
|
|
if (token != ORANGEFS_ITERATE_END)
|
|
goto try_again;
|
|
|
|
done:
|
|
gossip_debug(GOSSIP_XATTR_DEBUG, "%s: returning %d"
|
|
" [size of buffer %ld] (filled in %d keys)\n",
|
|
__func__,
|
|
ret ? (int)ret : (int)total,
|
|
(long)size,
|
|
count_keys);
|
|
op_release(new_op);
|
|
if (ret == 0)
|
|
ret = total;
|
|
out_unlock:
|
|
up_read(&orangefs_inode->xattr_sem);
|
|
return ret;
|
|
}
|
|
|
|
static int orangefs_xattr_set_default(const struct xattr_handler *handler,
|
|
struct dentry *unused,
|
|
struct inode *inode,
|
|
const char *name,
|
|
const void *buffer,
|
|
size_t size,
|
|
int flags)
|
|
{
|
|
return orangefs_inode_setxattr(inode, name, buffer, size, flags);
|
|
}
|
|
|
|
static int orangefs_xattr_get_default(const struct xattr_handler *handler,
|
|
struct dentry *unused,
|
|
struct inode *inode,
|
|
const char *name,
|
|
void *buffer,
|
|
size_t size)
|
|
{
|
|
return orangefs_inode_getxattr(inode, name, buffer, size);
|
|
|
|
}
|
|
|
|
static struct xattr_handler orangefs_xattr_default_handler = {
|
|
.prefix = "", /* match any name => handlers called with full name */
|
|
.get = orangefs_xattr_get_default,
|
|
.set = orangefs_xattr_set_default,
|
|
};
|
|
|
|
const struct xattr_handler *orangefs_xattr_handlers[] = {
|
|
&posix_acl_access_xattr_handler,
|
|
&posix_acl_default_xattr_handler,
|
|
&orangefs_xattr_default_handler,
|
|
NULL
|
|
};
|