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>

#define XATTR_CEPH_PREFIX "ceph."
#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)

static bool ceph_is_valid_xattr(const char *name)
{
	return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
	       !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 {
	char *name;
	size_t name_size;	/* strlen(name) + 1 (for '\0') */
	size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
			      size_t size);
	bool readonly, hidden;
	bool (*exists_cb)(struct ceph_inode_info *ci);
};

/* layouts */

static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
{
	size_t s;
	char *p = (char *)&ci->i_layout;

	for (s = 0; s < sizeof(ci->i_layout); s++, p++)
		if (*p)
			return true;
	return false;
}

static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
					size_t size)
{
	int 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 = ceph_file_layout_pg_pool(ci->i_layout);
	const char *pool_name;

	dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
	down_read(&osdc->map_sem);
	pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
	if (pool_name)
		ret = snprintf(val, size,
		"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%s",
		(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),
		pool_name);
	else
		ret = snprintf(val, size,
		"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
		(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),
		(unsigned long long)pool);

	up_read(&osdc->map_sem);
	return ret;
}

static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
					       char *val, size_t size)
{
	return snprintf(val, size, "%lld",
			(unsigned long long)ceph_file_layout_su(ci->i_layout));
}

static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
						char *val, size_t size)
{
	return snprintf(val, size, "%lld",
	       (unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
}

static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
					       char *val, size_t size)
{
	return snprintf(val, size, "%lld",
	       (unsigned long long)ceph_file_layout_object_size(ci->i_layout));
}

static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
					char *val, size_t size)
{
	int 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 = ceph_file_layout_pg_pool(ci->i_layout);
	const char *pool_name;

	down_read(&osdc->map_sem