path: root/fs/ceph/xattr.c

#include <linux/ceph/ceph_debug.h>

#include "super.h"
#include "mds_client.h"

#include <linux/ceph/decode.h>

#include <linux/xattr.h>
#include <linux/slab.h>

static bool ceph_is_valid_xattr(const char *name)
{
	return !strncmp(name, "ceph.", 5) ||
	       !strncmp(name, XATTR_SECURITY_PREFIX,
			XATTR_SECURITY_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_cb {
	bool readonly;
	char *name;
	size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
			      size_t size);
};

/* directories */

static size_t ceph_vxattrcb_entries(struct ceph_inode_info *ci, char *val,
					size_t size)
{
	return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
}

static size_t ceph_vxattrcb_files(struct ceph_inode_info *ci, char *val,
				      size_t size)
{
	return snprintf(val, size, "%lld", ci->i_files);
}

static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val,
					size_t size)
{
	return snprintf(val, size, "%lld", ci->i_subdirs);
}

static size_t ceph_vxattrcb_rentries(struct ceph_inode_info *ci, char *val,
					 size_t size)
{
	return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
}

static size_t ceph_vxattrcb_rfiles(struct ceph_inode_info *ci, char *val,
				       size_t size)
{
	return snprintf(val, size, "%lld", ci->i_rfiles);
}

static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val,
					 size_t size)
{
	return snprintf(val, size, "%lld", ci->i_rsubdirs);
}

static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val,
				       size_t size)
{
	return snprintf(val, size, "%lld", ci->i_rbytes);
}

static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val,
				       size_t size)
{
	return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec,
			(long)ci->i_rctime.tv_nsec);
}

static struct ceph_vxattr_cb ceph_dir_vxattrs[] = {
	{ true, "ceph.dir.entries", ceph_vxattrcb_entries},
	{ true, "ceph.dir.files", ceph_vxattrcb_files},
	{ true, "ceph.dir.subdirs", ceph_vxattrcb_subdirs},
	{ true, "ceph.dir.rentries", ceph_vxattrcb_rentries},
	{ true, "ceph.dir.rfiles", ceph_vxattrcb_rfiles},
	{ true, "ceph.dir.rsubdirs", ceph_vxattrcb_rsubdirs},
	{ true, "ceph.dir.rbytes", ceph_vxattrcb_rbytes},
	{ true, "ceph.dir.rctime", ceph_vxattrcb_rctime},
	{ true, NULL, NULL }
};

/* files */

static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
				   size_t size)
{
	int ret;

	ret = snprintf(val, size,
		"chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n",
		(unsigned long long)ceph_file_layout_su(ci->i_layout),
		(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
		(unsigned long long)ceph_file_layout_object_size(ci->i_layout));
	if (ceph_file_layout_pg_preferred(ci->i_layout))
		ret += snprintf(val + ret, size, "preferred_osd=%lld\n",
			    (unsigned long long)ceph_file_layout_pg_preferred(
				    ci->i_layout));
	return ret;
}

static struct ceph_vxattr_cb ceph_file_vxattrs[] = {
	{ true, "ceph.layout", ceph_vxattrcb_layout},
	{ NULL, NULL }
};

static struct ceph_vxattr_cb *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_cb *ceph_match_vxattr(struct ceph_vxattr_cb *vxattr,
						const char *name)
{
	do {
		if (strcmp(vxattr->name, name) == 0)
			return vxattr;
		vxattr++;
	} while (vxattr->name);
	return NULL;
}

static int __set_xattr(struct ceph_inode_info *ci,
			   const char *name, int name_len,
			   const char *val, int val_len,
			   int dirty,
			   int should_free_name, int should_free_val,
			   struct ceph_inode_xattr **newxattr)
{
	struct rb_node **p;
	struct rb_node *parent = NULL;
	struct ceph_inode_xattr *xattr = NULL