[linux.git] / fs / orangefs / xattr.c

// SPDX-License-Identifier: GPL-2.0
/*
 * (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) {
		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) {
		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 const 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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1182fca3 MM	2	/*
	3	* (C) 2001 Clemson University and The University of Chicago
	4	*
	5	* See COPYING in top-level directory.
	6	*/
	7
	8	/*
	9	* Linux VFS extended attribute operations.
	10	*/
	11
	12	#include "protocol.h"
575e9461 MM	13	#include "orangefs-kernel.h"
575e9461 MM	14	#include "orangefs-bufmap.h"
1182fca3 MM	15	#include <linux/posix_acl_xattr.h>
	16	#include <linux/xattr.h>
	17
	18
8bb8aefd YL	19	#define SYSTEM_ORANGEFS_KEY "system.pvfs2."
8bb8aefd YL	20	#define SYSTEM_ORANGEFS_KEY_LEN 13
1182fca3 MM	21
	22	/*
	23	* this function returns
	24	* 0 if the key corresponding to name is not meant to be printed as part
	25	* of a listxattr.
	26	* 1 if the key corresponding to name is meant to be returned as part of
	27	* a listxattr.
8bb8aefd	28	* The ones that start SYSTEM_ORANGEFS_KEY are the ones to avoid printing.
1182fca3 MM	29	*/
	30	static int is_reserved_key(const char *key, size_t size)
	31	{
	32
8bb8aefd	33	if (size < SYSTEM_ORANGEFS_KEY_LEN)
1182fca3 MM	34	return 1;
1182fca3 MM	35
8bb8aefd	36	return strncmp(key, SYSTEM_ORANGEFS_KEY, SYSTEM_ORANGEFS_KEY_LEN) ? 1 : 0;
1182fca3 MM	37	}
	38
	39	static inline int convert_to_internal_xattr_flags(int setxattr_flags)
	40	{
	41	int internal_flag = 0;
	42
	43	if (setxattr_flags & XATTR_REPLACE) {
	44	/* Attribute must exist! */
8bb8aefd	45	internal_flag = ORANGEFS_XATTR_REPLACE;
1182fca3 MM	46	} else if (setxattr_flags & XATTR_CREATE) {
1182fca3 MM	47	/* Attribute must not exist */
8bb8aefd	48	internal_flag = ORANGEFS_XATTR_CREATE;
1182fca3 MM	49	}
	50	return internal_flag;
	51	}
	52
	53
	54	/*
	55	* Tries to get a specified key's attributes of a given
	56	* file into a user-specified buffer. Note that the getxattr
	57	* interface allows for the users to probe the size of an
	58	* extended attribute by passing in a value of 0 to size.
	59	* Thus our return value is always the size of the attribute
	60	* unless the key does not exist for the file and/or if
	61	* there were errors in fetching the attribute value.
	62	*/
d373a712 AG	63	ssize_t orangefs_inode_getxattr(struct inode inode, const char name,
d373a712 AG	64	void *buffer, size_t size)
1182fca3	65	{
8bb8aefd YL	66	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
8bb8aefd YL	67	struct orangefs_kernel_op_s *new_op = NULL;
1182fca3 MM	68	ssize_t ret = -ENOMEM;
	69	ssize_t length = 0;
	70	int fsuid;
	71	int fsgid;
	72
	73	gossip_debug(GOSSIP_XATTR_DEBUG,
d373a712 AG	74	"%s: name %s, buffer_size %zd\n",
d373a712 AG	75	__func__, name, size);
1182fca3	76
6c6ef9f2 AG	77	if (S_ISLNK(inode->i_mode))
	78	return -EOPNOTSUPP;
	79
5f13e587	80	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
1182fca3	81	return -EINVAL;
1182fca3	82
78fee0b6 JH	83	fsuid = from_kuid(&init_user_ns, current_fsuid());
78fee0b6 JH	84	fsgid = from_kgid(&init_user_ns, current_fsgid());
1182fca3 MM	85
	86	gossip_debug(GOSSIP_XATTR_DEBUG,
	87	"getxattr on inode %pU, name %s "
	88	"(uid %o, gid %o)\n",
	89	get_khandle_from_ino(inode),
	90	name,
	91	fsuid,
	92	fsgid);
	93
8bb8aefd	94	down_read(&orangefs_inode->xattr_sem);
1182fca3	95
8bb8aefd	96	new_op = op_alloc(ORANGEFS_VFS_OP_GETXATTR);
1182fca3 MM	97	if (!new_op)
	98	goto out_unlock;
	99
8bb8aefd	100	new_op->upcall.req.getxattr.refn = orangefs_inode->refn;
d373a712	101	strcpy(new_op->upcall.req.getxattr.key, name);
1182fca3 MM	102
	103	/*
	104	* NOTE: Although keys are meant to be NULL terminated textual
	105	* strings, I am going to explicitly pass the length just in case
	106	* we change this later on...
	107	*/
d373a712	108	new_op->upcall.req.getxattr.key_sz = strlen(name) + 1;
1182fca3	109
8bb8aefd	110	ret = service_operation(new_op, "orangefs_inode_getxattr",
1182fca3 MM	111	get_interruptible_flag(inode));
	112	if (ret != 0) {
	113	if (ret == -ENOENT) {
	114	ret = -ENODATA;
	115	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	116	"orangefs_inode_getxattr: inode %pU key %s"
1182fca3 MM	117	" does not exist!\n",
	118	get_khandle_from_ino(inode),
	119	(char *)new_op->upcall.req.getxattr.key);
	120	}
	121	goto out_release_op;
	122	}
	123
	124	/*
	125	* Length returned includes null terminator.
	126	*/
	127	length = new_op->downcall.resp.getxattr.val_sz;
	128
	129	/*
	130	* Just return the length of the queried attribute.
	131	*/
	132	if (size == 0) {
	133	ret = length;
	134	goto out_release_op;
	135	}
	136
	137	/*
	138	* Check to see if key length is > provided buffer size.
	139	*/
	140	if (length > size) {
	141	ret = -ERANGE;
	142	goto out_release_op;
	143	}
	144
1182fca3	145	memcpy(buffer, new_op->downcall.resp.getxattr.val, length);
a9bb3ba8	146	memset(buffer + length, 0, size - length);
1182fca3	147	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	148	"orangefs_inode_getxattr: inode %pU "
1182fca3 MM	149	"key %s key_sz %d, val_len %d\n",
	150	get_khandle_from_ino(inode),
	151	(char *)new_op->
	152	upcall.req.getxattr.key,
	153	(int)new_op->
	154	upcall.req.getxattr.key_sz,
	155	(int)ret);
	156
	157	ret = length;
	158
	159	out_release_op:
	160	op_release(new_op);
	161	out_unlock:
8bb8aefd	162	up_read(&orangefs_inode->xattr_sem);
1182fca3 MM	163	return ret;
	164	}
	165
d373a712 AG	166	static int orangefs_inode_removexattr(struct inode inode, const char name,
d373a712 AG	167	int flags)
1182fca3	168	{
8bb8aefd YL	169	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
8bb8aefd YL	170	struct orangefs_kernel_op_s *new_op = NULL;
1182fca3 MM	171	int ret = -ENOMEM;
1182fca3 MM	172
5f13e587	173	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
e675c5ec MB	174	return -EINVAL;
e675c5ec MB	175
8bb8aefd YL	176	down_write(&orangefs_inode->xattr_sem);
8bb8aefd YL	177	new_op = op_alloc(ORANGEFS_VFS_OP_REMOVEXATTR);
1182fca3 MM	178	if (!new_op)
	179	goto out_unlock;
	180
8bb8aefd	181	new_op->upcall.req.removexattr.refn = orangefs_inode->refn;
1182fca3 MM	182	/*
	183	* NOTE: Although keys are meant to be NULL terminated
	184	* textual strings, I am going to explicitly pass the
	185	* length just in case we change this later on...
	186	*/
d373a712 AG	187	strcpy(new_op->upcall.req.removexattr.key, name);
d373a712 AG	188	new_op->upcall.req.removexattr.key_sz = strlen(name) + 1;
1182fca3 MM	189
1182fca3 MM	190	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	191	"orangefs_inode_removexattr: key %s, key_sz %d\n",
1182fca3 MM	192	(char *)new_op->upcall.req.removexattr.key,
	193	(int)new_op->upcall.req.removexattr.key_sz);
	194
	195	ret = service_operation(new_op,
8bb8aefd	196	"orangefs_inode_removexattr",
1182fca3 MM	197	get_interruptible_flag(inode));
	198	if (ret == -ENOENT) {
	199	/*
	200	* Request to replace a non-existent attribute is an error.
	201	*/
	202	if (flags & XATTR_REPLACE)
	203	ret = -ENODATA;
	204	else
	205	ret = 0;
	206	}
	207
	208	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	209	"orangefs_inode_removexattr: returning %d\n", ret);
1182fca3 MM	210
	211	op_release(new_op);
	212	out_unlock:
8bb8aefd	213	up_write(&orangefs_inode->xattr_sem);
1182fca3 MM	214	return ret;
	215	}
	216
	217	/*
	218	* Tries to set an attribute for a given key on a file.
	219	*
	220	* Returns a -ve number on error and 0 on success. Key is text, but value
	221	* can be binary!
	222	*/
d373a712 AG	223	int orangefs_inode_setxattr(struct inode inode, const char name,
d373a712 AG	224	const void *value, size_t size, int flags)
1182fca3	225	{
8bb8aefd YL	226	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
8bb8aefd YL	227	struct orangefs_kernel_op_s *new_op;
1182fca3 MM	228	int internal_flag = 0;
	229	int ret = -ENOMEM;
	230
	231	gossip_debug(GOSSIP_XATTR_DEBUG,
d373a712 AG	232	"%s: name %s, buffer_size %zd\n",
d373a712 AG	233	__func__, name, size);
1182fca3	234
e675c5ec MB	235	if (size > ORANGEFS_MAX_XATTR_VALUELEN)
e675c5ec MB	236	return -EINVAL;
5f13e587	237	if (strlen(name) >= ORANGEFS_MAX_XATTR_NAMELEN)
1182fca3	238	return -EINVAL;
1182fca3	239
1182fca3 MM	240	internal_flag = convert_to_internal_xattr_flags(flags);
1182fca3 MM	241
1182fca3	242	/* This is equivalent to a removexattr */
0b08273c	243	if (size == 0 && !value) {
1182fca3	244	gossip_debug(GOSSIP_XATTR_DEBUG,
d373a712	245	"removing xattr (%s)\n",
1182fca3	246	name);
d373a712	247	return orangefs_inode_removexattr(inode, name, flags);
1182fca3 MM	248	}
	249
	250	gossip_debug(GOSSIP_XATTR_DEBUG,
	251	"setxattr on inode %pU, name %s\n",
	252	get_khandle_from_ino(inode),
	253	name);
	254
8bb8aefd YL	255	down_write(&orangefs_inode->xattr_sem);
8bb8aefd YL	256	new_op = op_alloc(ORANGEFS_VFS_OP_SETXATTR);
1182fca3 MM	257	if (!new_op)
	258	goto out_unlock;
	259
	260
8bb8aefd	261	new_op->upcall.req.setxattr.refn = orangefs_inode->refn;
1182fca3 MM	262	new_op->upcall.req.setxattr.flags = internal_flag;
	263	/*
	264	* NOTE: Although keys are meant to be NULL terminated textual
	265	* strings, I am going to explicitly pass the length just in
	266	* case we change this later on...
	267	*/
d373a712 AG	268	strcpy(new_op->upcall.req.setxattr.keyval.key, name);
d373a712 AG	269	new_op->upcall.req.setxattr.keyval.key_sz = strlen(name) + 1;
1182fca3 MM	270	memcpy(new_op->upcall.req.setxattr.keyval.val, value, size);
	271	new_op->upcall.req.setxattr.keyval.val_sz = size;
	272
	273	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	274	"orangefs_inode_setxattr: key %s, key_sz %d "
1182fca3 MM	275	" value size %zd\n",
	276	(char *)new_op->upcall.req.setxattr.keyval.key,
	277	(int)new_op->upcall.req.setxattr.keyval.key_sz,
	278	size);
	279
	280	ret = service_operation(new_op,
8bb8aefd	281	"orangefs_inode_setxattr",
1182fca3 MM	282	get_interruptible_flag(inode));
	283
	284	gossip_debug(GOSSIP_XATTR_DEBUG,
8bb8aefd	285	"orangefs_inode_setxattr: returning %d\n",
1182fca3 MM	286	ret);
	287
	288	/* when request is serviced properly, free req op struct */
	289	op_release(new_op);
	290	out_unlock:
8bb8aefd	291	up_write(&orangefs_inode->xattr_sem);
1182fca3 MM	292	return ret;
	293	}
	294
	295	/*
	296	* Tries to get a specified object's keys into a user-specified buffer of a
	297	* given size. Note that like the previous instances of xattr routines, this
	298	* also allows you to pass in a NULL pointer and 0 size to probe the size for
	299	* subsequent memory allocations. Thus our return value is always the size of
	300	* all the keys unless there were errors in fetching the keys!
	301	*/
8bb8aefd	302	ssize_t orangefs_listxattr(struct dentry dentry, char buffer, size_t size)
1182fca3 MM	303	{
1182fca3 MM	304	struct inode *inode = dentry->d_inode;
8bb8aefd YL	305	struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
	306	struct orangefs_kernel_op_s *new_op;
	307	__u64 token = ORANGEFS_ITERATE_START;
1182fca3 MM	308	ssize_t ret = -ENOMEM;
1182fca3 MM	309	ssize_t total = 0;
1182fca3 MM	310	int count_keys = 0;
	311	int key_size;
	312	int i = 0;
62441fa5	313	int returned_count = 0;
1182fca3	314
0b08273c	315	if (size > 0 && !buffer) {
1182fca3 MM	316	gossip_err("%s: bogus NULL pointers\n", __func__);
	317	return -EINVAL;
	318	}
1182fca3	319
8bb8aefd YL	320	down_read(&orangefs_inode->xattr_sem);
8bb8aefd YL	321	new_op = op_alloc(ORANGEFS_VFS_OP_LISTXATTR);
1182fca3 MM	322	if (!new_op)
	323	goto out_unlock;
	324
	325	if (buffer && size > 0)
	326	memset(buffer, 0, size);
	327
	328	try_again:
	329	key_size = 0;
8bb8aefd	330	new_op->upcall.req.listxattr.refn = orangefs_inode->refn;
1182fca3 MM	331	new_op->upcall.req.listxattr.token = token;
1182fca3 MM	332	new_op->upcall.req.listxattr.requested_count =
8bb8aefd	333	(size == 0) ? 0 : ORANGEFS_MAX_XATTR_LISTLEN;
1182fca3 MM	334	ret = service_operation(new_op, __func__,
	335	get_interruptible_flag(inode));
	336	if (ret != 0)
	337	goto done;
	338
	339	if (size == 0) {
	340	/*
	341	* This is a bit of a big upper limit, but I did not want to
	342	* spend too much time getting this correct, since users end
	343	* up allocating memory rather than us...
	344	*/
	345	total = new_op->downcall.resp.listxattr.returned_count *
8bb8aefd	346	ORANGEFS_MAX_XATTR_NAMELEN;
1182fca3 MM	347	goto done;
	348	}
	349
62441fa5 MM	350	returned_count = new_op->downcall.resp.listxattr.returned_count;
62441fa5 MM	351	if (returned_count < 0 \|\|
a956af33	352	returned_count > ORANGEFS_MAX_XATTR_LISTLEN) {
62441fa5 MM	353	gossip_err("%s: impossible value for returned_count:%d:\n",
	354	__func__,
	355	returned_count);
02a5cc53	356	ret = -EIO;
62441fa5 MM	357	goto done;
	358	}
	359
1182fca3 MM	360	/*
	361	* Check to see how much can be fit in the buffer. Fit only whole keys.
	362	*/
62441fa5	363	for (i = 0; i < returned_count; i++) {
02a5cc53 MB	364	if (new_op->downcall.resp.listxattr.lengths[i] < 0 \|\|
	365	new_op->downcall.resp.listxattr.lengths[i] >
	366	ORANGEFS_MAX_XATTR_NAMELEN) {
	367	gossip_err("%s: impossible value for lengths[%d]\n",
	368	__func__,
	369	new_op->downcall.resp.listxattr.lengths[i]);
	370	ret = -EIO;
	371	goto done;
	372	}
1182fca3 MM	373	if (total + new_op->downcall.resp.listxattr.lengths[i] > size)
	374	goto done;
	375
	376	/*
	377	* Since many dumb programs try to setxattr() on our reserved
	378	* xattrs this is a feeble attempt at defeating those by not
	379	* listing them in the output of listxattr.. sigh
	380	*/
	381	if (is_reserved_key(new_op->downcall.resp.listxattr.key +
	382	key_size,
	383	new_op->downcall.resp.
	384	listxattr.lengths[i])) {
	385	gossip_debug(GOSSIP_XATTR_DEBUG, "Copying key %d -> %s\n",
	386	i, new_op->downcall.resp.listxattr.key +
	387	key_size);
	388	memcpy(buffer + total,
	389	new_op->downcall.resp.listxattr.key + key_size,
	390	new_op->downcall.resp.listxattr.lengths[i]);
	391	total += new_op->downcall.resp.listxattr.lengths[i];
	392	count_keys++;
	393	} else {
	394	gossip_debug(GOSSIP_XATTR_DEBUG, "[RESERVED] key %d -> %s\n",
	395	i, new_op->downcall.resp.listxattr.key +
	396	key_size);
	397	}
	398	key_size += new_op->downcall.resp.listxattr.lengths[i];
	399	}
	400
	401	/*
	402	* Since the buffer was large enough, we might have to continue
	403	* fetching more keys!
	404	*/
	405	token = new_op->downcall.resp.listxattr.token;
8bb8aefd	406	if (token != ORANGEFS_ITERATE_END)
1182fca3 MM	407	goto try_again;
	408
	409	done:
	410	gossip_debug(GOSSIP_XATTR_DEBUG, "%s: returning %d"
	411	" [size of buffer %ld] (filled in %d keys)\n",
	412	__func__,
	413	ret ? (int)ret : (int)total,
	414	(long)size,
	415	count_keys);
	416	op_release(new_op);
	417	if (ret == 0)
	418	ret = total;
	419	out_unlock:
8bb8aefd	420	up_read(&orangefs_inode->xattr_sem);
1182fca3 MM	421	return ret;
	422	}
	423
8bb8aefd	424	static int orangefs_xattr_set_default(const struct xattr_handler *handler,
59301226 AV	425	struct dentry *unused,
59301226 AV	426	struct inode *inode,
8bb8aefd YL	427	const char *name,
	428	const void *buffer,
	429	size_t size,
	430	int flags)
1182fca3	431	{
d373a712	432	return orangefs_inode_setxattr(inode, name, buffer, size, flags);
1182fca3 MM	433	}
1182fca3 MM	434
8bb8aefd	435	static int orangefs_xattr_get_default(const struct xattr_handler *handler,
b296821a AV	436	struct dentry *unused,
b296821a AV	437	struct inode *inode,
8bb8aefd YL	438	const char *name,
	439	void *buffer,
	440	size_t size)
1182fca3	441	{
d373a712	442	return orangefs_inode_getxattr(inode, name, buffer, size);
1182fca3 MM	443
	444	}
	445
12174444	446	static const struct xattr_handler orangefs_xattr_default_handler = {
972a7344	447	.prefix = "", /* match any name => handlers called with full name */
8bb8aefd YL	448	.get = orangefs_xattr_get_default,
8bb8aefd YL	449	.set = orangefs_xattr_set_default,
1182fca3 MM	450	};
1182fca3 MM	451
8bb8aefd	452	const struct xattr_handler *orangefs_xattr_handlers[] = {
1182fca3 MM	453	&posix_acl_access_xattr_handler,
1182fca3 MM	454	&posix_acl_default_xattr_handler,
8bb8aefd	455	&orangefs_xattr_default_handler,
1182fca3 MM	456	NULL
1182fca3 MM	457	};