[mirror_ubuntu-bionic-kernel.git] / fs / orangefs / xattr.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) {
		gossip_err("Invalid key length (%d)\n",
			   (int)strlen(name));
		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;

	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 ||
	    flags < 0) {
		gossip_err("orangefs_inode_setxattr: bogus values of size(%d), flags(%d)\n",
			   (int)size,
			   flags);
		return -EINVAL;
	}

	internal_flag = convert_to_internal_xattr_flags(flags);

	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) {
		gossip_err
		    ("orangefs_inode_setxattr: bogus key size (%d)\n",
		     (int)(strlen(name)));
		return -EINVAL;
	}

	/* 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
};
Commit	Line	Data
1182fca3 MM	1	/*
	2	* (C) 2001 Clemson University and The University of Chicago
	3	*
	4	* See COPYING in top-level directory.
	5	*/
	6
	7	/*
	8	* Linux VFS extended attribute operations.
	9	*/
	10
	11	#include "protocol.h"
575e9461 MM	12	#include "orangefs-kernel.h"
575e9461 MM	13	#include "orangefs-bufmap.h"
1182fca3 MM	14	#include <linux/posix_acl_xattr.h>
	15	#include <linux/xattr.h>
	16
	17
8bb8aefd YL	18	#define SYSTEM_ORANGEFS_KEY "system.pvfs2."
8bb8aefd YL	19	#define SYSTEM_ORANGEFS_KEY_LEN 13
1182fca3 MM	20
	21	/*
	22	* this function returns
	23	* 0 if the key corresponding to name is not meant to be printed as part
	24	* of a listxattr.
	25	* 1 if the key corresponding to name is meant to be returned as part of
	26	* a listxattr.
8bb8aefd	27	* The ones that start SYSTEM_ORANGEFS_KEY are the ones to avoid printing.
1182fca3 MM	28	*/
	29	static int is_reserved_key(const char *key, size_t size)
	30	{
	31
8bb8aefd	32	if (size < SYSTEM_ORANGEFS_KEY_LEN)
1182fca3 MM	33	return 1;
1182fca3 MM	34
8bb8aefd	35	return strncmp(key, SYSTEM_ORANGEFS_KEY, SYSTEM_ORANGEFS_KEY_LEN) ? 1 : 0;
1182fca3 MM	36	}
	37
	38	static inline int convert_to_internal_xattr_flags(int setxattr_flags)
	39	{
	40	int internal_flag = 0;
	41
	42	if (setxattr_flags & XATTR_REPLACE) {
	43	/* Attribute must exist! */
8bb8aefd	44	internal_flag = ORANGEFS_XATTR_REPLACE;
1182fca3 MM	45	} else if (setxattr_flags & XATTR_CREATE) {
1182fca3 MM	46	/* Attribute must not exist */
8bb8aefd	47	internal_flag = ORANGEFS_XATTR_CREATE;
1182fca3 MM	48	}
	49	return internal_flag;
	50	}
	51
	52
	53	/*
	54	* Tries to get a specified key's attributes of a given
	55	* file into a user-specified buffer. Note that the getxattr
	56	* interface allows for the users to probe the size of an
	57	* extended attribute by passing in a value of 0 to size.
	58	* Thus our return value is always the size of the attribute
	59	* unless the key does not exist for the file and/or if
	60	* there were errors in fetching the attribute value.
	61	*/
d373a712 AG	62	ssize_t orangefs_inode_getxattr(struct inode inode, const char name,
d373a712 AG	63	void *buffer, size_t size)
1182fca3	64	{
8bb8aefd YL	65	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
8bb8aefd YL	66	struct orangefs_kernel_op_s *new_op = NULL;
1182fca3 MM	67	ssize_t ret = -ENOMEM;
	68	ssize_t length = 0;
	69	int fsuid;
	70	int fsgid;
	71
	72	gossip_debug(GOSSIP_XATTR_DEBUG,
d373a712 AG	73	"%s: name %s, buffer_size %zd\n",
d373a712 AG	74	__func__, name, size);
1182fca3	75
6c6ef9f2 AG	76	if (S_ISLNK(inode->i_mode))
	77	return -EOPNOTSUPP;
	78
d373a712	79	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) {
eeaa3d44	80	gossip_err("Invalid key length (%d)\n",
d373a712	81	(int)strlen(name));
1182fca3 MM	82	return -EINVAL;
	83	}
	84
78fee0b6 JH	85	fsuid = from_kuid(&init_user_ns, current_fsuid());
78fee0b6 JH	86	fsgid = from_kgid(&init_user_ns, current_fsgid());
1182fca3 MM	87
	88	gossip_debug(GOSSIP_XATTR_DEBUG,
	89	"getxattr on inode %pU, name %s "
	90	"(uid %o, gid %o)\n",
	91	get_khandle_from_ino(inode),
	92	name,
	93	fsuid,
	94	fsgid);
	95
8bb8aefd	96	down_read(&orangefs_inode->xattr_sem);
1182fca3	97
8bb8aefd	98	new_op = op_alloc(ORANGEFS_VFS_OP_GETXATTR);
1182fca3 MM	99	if (!new_op)
	100	goto out_unlock;
	101
8bb8aefd	102	new_op->upcall.req.getxattr.refn = orangefs_inode->refn;
d373a712	103	strcpy(new_op->upcall.req.getxattr.key, name);
1182fca3 MM	104
	105	/*
	106	* NOTE: Although keys are meant to be NULL terminated textual
	107	* strings, I am going to explicitly pass the length just in case
	108	* we change this later on...
	109	*/
d373a712	110	new_op->upcall.req.getxattr.key_sz = strlen(name) + 1;
1182fca3	111
8bb8aefd	112	ret = service_operation(new_op, "orangefs_inode_getxattr",
1182fca3 MM	113	get_interruptible_flag(inode));
	114	if (ret != 0) {
	115	if (ret == -ENOENT) {
	116	ret = -ENODATA;
	117	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	118	"orangefs_inode_getxattr: inode %pU key %s"
1182fca3 MM	119	" does not exist!\n",
	120	get_khandle_from_ino(inode),
	121	(char *)new_op->upcall.req.getxattr.key);
	122	}
	123	goto out_release_op;
	124	}
	125
	126	/*
	127	* Length returned includes null terminator.
	128	*/
	129	length = new_op->downcall.resp.getxattr.val_sz;
	130
	131	/*
	132	* Just return the length of the queried attribute.
	133	*/
	134	if (size == 0) {
	135	ret = length;
	136	goto out_release_op;
	137	}
	138
	139	/*
	140	* Check to see if key length is > provided buffer size.
	141	*/
	142	if (length > size) {
	143	ret = -ERANGE;
	144	goto out_release_op;
	145	}
	146
1182fca3	147	memcpy(buffer, new_op->downcall.resp.getxattr.val, length);
a9bb3ba8	148	memset(buffer + length, 0, size - length);
1182fca3	149	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	150	"orangefs_inode_getxattr: inode %pU "
1182fca3 MM	151	"key %s key_sz %d, val_len %d\n",
	152	get_khandle_from_ino(inode),
	153	(char *)new_op->
	154	upcall.req.getxattr.key,
	155	(int)new_op->
	156	upcall.req.getxattr.key_sz,
	157	(int)ret);
	158
	159	ret = length;
	160
	161	out_release_op:
	162	op_release(new_op);
	163	out_unlock:
8bb8aefd	164	up_read(&orangefs_inode->xattr_sem);
1182fca3 MM	165	return ret;
	166	}
	167
d373a712 AG	168	static int orangefs_inode_removexattr(struct inode inode, const char name,
d373a712 AG	169	int flags)
1182fca3	170	{
8bb8aefd YL	171	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
8bb8aefd YL	172	struct orangefs_kernel_op_s *new_op = NULL;
1182fca3 MM	173	int ret = -ENOMEM;
1182fca3 MM	174
8bb8aefd YL	175	down_write(&orangefs_inode->xattr_sem);
8bb8aefd YL	176	new_op = op_alloc(ORANGEFS_VFS_OP_REMOVEXATTR);
1182fca3 MM	177	if (!new_op)
	178	goto out_unlock;
	179
8bb8aefd	180	new_op->upcall.req.removexattr.refn = orangefs_inode->refn;
1182fca3 MM	181	/*
	182	* NOTE: Although keys are meant to be NULL terminated
	183	* textual strings, I am going to explicitly pass the
	184	* length just in case we change this later on...
	185	*/
d373a712 AG	186	strcpy(new_op->upcall.req.removexattr.key, name);
d373a712 AG	187	new_op->upcall.req.removexattr.key_sz = strlen(name) + 1;
1182fca3 MM	188
1182fca3 MM	189	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	190	"orangefs_inode_removexattr: key %s, key_sz %d\n",
1182fca3 MM	191	(char *)new_op->upcall.req.removexattr.key,
	192	(int)new_op->upcall.req.removexattr.key_sz);
	193
	194	ret = service_operation(new_op,
8bb8aefd	195	"orangefs_inode_removexattr",
1182fca3 MM	196	get_interruptible_flag(inode));
	197	if (ret == -ENOENT) {
	198	/*
	199	* Request to replace a non-existent attribute is an error.
	200	*/
	201	if (flags & XATTR_REPLACE)
	202	ret = -ENODATA;
	203	else
	204	ret = 0;
	205	}
	206
	207	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	208	"orangefs_inode_removexattr: returning %d\n", ret);
1182fca3 MM	209
	210	op_release(new_op);
	211	out_unlock:
8bb8aefd	212	up_write(&orangefs_inode->xattr_sem);
1182fca3 MM	213	return ret;
	214	}
	215
	216	/*
	217	* Tries to set an attribute for a given key on a file.
	218	*
	219	* Returns a -ve number on error and 0 on success. Key is text, but value
	220	* can be binary!
	221	*/
d373a712 AG	222	int orangefs_inode_setxattr(struct inode inode, const char name,
d373a712 AG	223	const void *value, size_t size, int flags)
1182fca3	224	{
8bb8aefd YL	225	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
8bb8aefd YL	226	struct orangefs_kernel_op_s *new_op;
1182fca3 MM	227	int internal_flag = 0;
	228	int ret = -ENOMEM;
	229
	230	gossip_debug(GOSSIP_XATTR_DEBUG,
d373a712 AG	231	"%s: name %s, buffer_size %zd\n",
d373a712 AG	232	__func__, name, size);
1182fca3	233
2d09a2ca	234	if (size >= ORANGEFS_MAX_XATTR_VALUELEN \|\|
1182fca3	235	flags < 0) {
8bb8aefd	236	gossip_err("orangefs_inode_setxattr: bogus values of size(%d), flags(%d)\n",
1182fca3 MM	237	(int)size,
	238	flags);
	239	return -EINVAL;
	240	}
	241
1182fca3 MM	242	internal_flag = convert_to_internal_xattr_flags(flags);
1182fca3 MM	243
d373a712 AG	244	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN) {
	245	gossip_err
	246	("orangefs_inode_setxattr: bogus key size (%d)\n",
	247	(int)(strlen(name)));
	248	return -EINVAL;
1182fca3 MM	249	}
	250
	251	/* This is equivalent to a removexattr */
	252	if (size == 0 && value == NULL) {
	253	gossip_debug(GOSSIP_XATTR_DEBUG,
d373a712	254	"removing xattr (%s)\n",
1182fca3	255	name);
d373a712	256	return orangefs_inode_removexattr(inode, name, flags);
1182fca3 MM	257	}
	258
	259	gossip_debug(GOSSIP_XATTR_DEBUG,
	260	"setxattr on inode %pU, name %s\n",
	261	get_khandle_from_ino(inode),
	262	name);
	263
8bb8aefd YL	264	down_write(&orangefs_inode->xattr_sem);
8bb8aefd YL	265	new_op = op_alloc(ORANGEFS_VFS_OP_SETXATTR);
1182fca3 MM	266	if (!new_op)
	267	goto out_unlock;
	268
	269
8bb8aefd	270	new_op->upcall.req.setxattr.refn = orangefs_inode->refn;
1182fca3 MM	271	new_op->upcall.req.setxattr.flags = internal_flag;
	272	/*
	273	* NOTE: Although keys are meant to be NULL terminated textual
	274	* strings, I am going to explicitly pass the length just in
	275	* case we change this later on...
	276	*/
d373a712 AG	277	strcpy(new_op->upcall.req.setxattr.keyval.key, name);
d373a712 AG	278	new_op->upcall.req.setxattr.keyval.key_sz = strlen(name) + 1;
1182fca3 MM	279	memcpy(new_op->upcall.req.setxattr.keyval.val, value, size);
	280	new_op->upcall.req.setxattr.keyval.val_sz = size;
	281
	282	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	283	"orangefs_inode_setxattr: key %s, key_sz %d "
1182fca3 MM	284	" value size %zd\n",
	285	(char *)new_op->upcall.req.setxattr.keyval.key,
	286	(int)new_op->upcall.req.setxattr.keyval.key_sz,
	287	size);
	288
	289	ret = service_operation(new_op,
8bb8aefd	290	"orangefs_inode_setxattr",
1182fca3 MM	291	get_interruptible_flag(inode));
	292
	293	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	294	"orangefs_inode_setxattr: returning %d\n",
1182fca3 MM	295	ret);
	296
	297	/* when request is serviced properly, free req op struct */
	298	op_release(new_op);
	299	out_unlock:
8bb8aefd	300	up_write(&orangefs_inode->xattr_sem);
1182fca3 MM	301	return ret;
	302	}
	303
	304	/*
	305	* Tries to get a specified object's keys into a user-specified buffer of a
	306	* given size. Note that like the previous instances of xattr routines, this
	307	* also allows you to pass in a NULL pointer and 0 size to probe the size for
	308	* subsequent memory allocations. Thus our return value is always the size of
	309	* all the keys unless there were errors in fetching the keys!
	310	*/
8bb8aefd	311	ssize_t orangefs_listxattr(struct dentry dentry, char buffer, size_t size)
1182fca3 MM	312	{
1182fca3 MM	313	struct inode *inode = dentry->d_inode;
8bb8aefd YL	314	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	315	struct orangefs_kernel_op_s *new_op;
	316	__u64 token = ORANGEFS_ITERATE_START;
1182fca3 MM	317	ssize_t ret = -ENOMEM;
1182fca3 MM	318	ssize_t total = 0;
1182fca3 MM	319	int count_keys = 0;
	320	int key_size;
	321	int i = 0;
62441fa5	322	int returned_count = 0;
1182fca3 MM	323
	324	if (size > 0 && buffer == NULL) {
	325	gossip_err("%s: bogus NULL pointers\n", __func__);
	326	return -EINVAL;
	327	}
1182fca3	328
8bb8aefd YL	329	down_read(&orangefs_inode->xattr_sem);
8bb8aefd YL	330	new_op = op_alloc(ORANGEFS_VFS_OP_LISTXATTR);
1182fca3 MM	331	if (!new_op)
	332	goto out_unlock;
	333
	334	if (buffer && size > 0)
	335	memset(buffer, 0, size);
	336
	337	try_again:
	338	key_size = 0;
8bb8aefd	339	new_op->upcall.req.listxattr.refn = orangefs_inode->refn;
1182fca3 MM	340	new_op->upcall.req.listxattr.token = token;
1182fca3 MM	341	new_op->upcall.req.listxattr.requested_count =
8bb8aefd	342	(size == 0) ? 0 : ORANGEFS_MAX_XATTR_LISTLEN;
1182fca3 MM	343	ret = service_operation(new_op, __func__,
	344	get_interruptible_flag(inode));
	345	if (ret != 0)
	346	goto done;
	347
	348	if (size == 0) {
	349	/*
	350	* This is a bit of a big upper limit, but I did not want to
	351	* spend too much time getting this correct, since users end
	352	* up allocating memory rather than us...
	353	*/
	354	total = new_op->downcall.resp.listxattr.returned_count *
8bb8aefd	355	ORANGEFS_MAX_XATTR_NAMELEN;
1182fca3 MM	356	goto done;
	357	}
	358
62441fa5 MM	359	returned_count = new_op->downcall.resp.listxattr.returned_count;
	360	if (returned_count < 0 \|\|
	361	returned_count >= ORANGEFS_MAX_XATTR_LISTLEN) {
	362	gossip_err("%s: impossible value for returned_count:%d:\n",
	363	__func__,
	364	returned_count);
02a5cc53	365	ret = -EIO;
62441fa5 MM	366	goto done;
	367	}
	368
1182fca3 MM	369	/*
	370	* Check to see how much can be fit in the buffer. Fit only whole keys.
	371	*/
62441fa5	372	for (i = 0; i < returned_count; i++) {
02a5cc53 MB	373	if (new_op->downcall.resp.listxattr.lengths[i] < 0 \|\|
	374	new_op->downcall.resp.listxattr.lengths[i] >
	375	ORANGEFS_MAX_XATTR_NAMELEN) {
	376	gossip_err("%s: impossible value for lengths[%d]\n",
	377	__func__,
	378	new_op->downcall.resp.listxattr.lengths[i]);
	379	ret = -EIO;
	380	goto done;
	381	}
1182fca3 MM	382	if (total + new_op->downcall.resp.listxattr.lengths[i] > size)
	383	goto done;
	384
	385	/*
	386	* Since many dumb programs try to setxattr() on our reserved
	387	* xattrs this is a feeble attempt at defeating those by not
	388	* listing them in the output of listxattr.. sigh
	389	*/
	390	if (is_reserved_key(new_op->downcall.resp.listxattr.key +
	391	key_size,
	392	new_op->downcall.resp.
	393	listxattr.lengths[i])) {
	394	gossip_debug(GOSSIP_XATTR_DEBUG, "Copying key %d -> %s\n",
	395	i, new_op->downcall.resp.listxattr.key +
	396	key_size);
	397	memcpy(buffer + total,
	398	new_op->downcall.resp.listxattr.key + key_size,
	399	new_op->downcall.resp.listxattr.lengths[i]);
	400	total += new_op->downcall.resp.listxattr.lengths[i];
	401	count_keys++;
	402	} else {
	403	gossip_debug(GOSSIP_XATTR_DEBUG, "[RESERVED] key %d -> %s\n",
	404	i, new_op->downcall.resp.listxattr.key +
	405	key_size);
	406	}
	407	key_size += new_op->downcall.resp.listxattr.lengths[i];
	408	}
	409
	410	/*
	411	* Since the buffer was large enough, we might have to continue
	412	* fetching more keys!
	413	*/
	414	token = new_op->downcall.resp.listxattr.token;
8bb8aefd	415	if (token != ORANGEFS_ITERATE_END)
1182fca3 MM	416	goto try_again;
	417
	418	done:
	419	gossip_debug(GOSSIP_XATTR_DEBUG, "%s: returning %d"
	420	" [size of buffer %ld] (filled in %d keys)\n",
	421	__func__,
	422	ret ? (int)ret : (int)total,
	423	(long)size,
	424	count_keys);
	425	op_release(new_op);
	426	if (ret == 0)
	427	ret = total;
	428	out_unlock:
8bb8aefd	429	up_read(&orangefs_inode->xattr_sem);
1182fca3 MM	430	return ret;
	431	}
	432
8bb8aefd	433	static int orangefs_xattr_set_default(const struct xattr_handler *handler,
59301226 AV	434	struct dentry *unused,
59301226 AV	435	struct inode *inode,
8bb8aefd YL	436	const char *name,
	437	const void *buffer,
	438	size_t size,
	439	int flags)
1182fca3	440	{
d373a712	441	return orangefs_inode_setxattr(inode, name, buffer, size, flags);
1182fca3 MM	442	}
1182fca3 MM	443
8bb8aefd	444	static int orangefs_xattr_get_default(const struct xattr_handler *handler,
b296821a AV	445	struct dentry *unused,
b296821a AV	446	struct inode *inode,
8bb8aefd YL	447	const char *name,
	448	void *buffer,
	449	size_t size)
1182fca3	450	{
d373a712	451	return orangefs_inode_getxattr(inode, name, buffer, size);
1182fca3 MM	452
	453	}
	454
8bb8aefd	455	static struct xattr_handler orangefs_xattr_default_handler = {
972a7344	456	.prefix = "", /* match any name => handlers called with full name */
8bb8aefd YL	457	.get = orangefs_xattr_get_default,
8bb8aefd YL	458	.set = orangefs_xattr_set_default,
1182fca3 MM	459	};
1182fca3 MM	460
8bb8aefd	461	const struct xattr_handler *orangefs_xattr_handlers[] = {
1182fca3 MM	462	&posix_acl_access_xattr_handler,
1182fca3 MM	463	&posix_acl_default_xattr_handler,
8bb8aefd	464	&orangefs_xattr_default_handler,
1182fca3 MM	465	NULL
1182fca3 MM	466	};