1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Some non-inline ceph helpers
  4 */
  5#include <linux/module.h>
  6#include <linux/ceph/types.h>
  7
  8/*
  9 * return true if @layout appears to be valid
 10 */
 11int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
 12{
 13	__u32 su = layout->stripe_unit;
 14	__u32 sc = layout->stripe_count;
 15	__u32 os = layout->object_size;
 16
 17	/* stripe unit, object size must be non-zero, 64k increment */
 18	if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
 19		return 0;
 20	if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
 21		return 0;
 22	/* object size must be a multiple of stripe unit */
 23	if (os < su || os % su)
 24		return 0;
 25	/* stripe count must be non-zero */
 26	if (!sc)
 27		return 0;
 28	return 1;
 29}
 30
 31void ceph_file_layout_from_legacy(struct ceph_file_layout *fl,
 32				  struct ceph_file_layout_legacy *legacy)
 33{
 34	fl->stripe_unit = le32_to_cpu(legacy->fl_stripe_unit);
 35	fl->stripe_count = le32_to_cpu(legacy->fl_stripe_count);
 36	fl->object_size = le32_to_cpu(legacy->fl_object_size);
 37	fl->pool_id = le32_to_cpu(legacy->fl_pg_pool);
 38	if (fl->pool_id == 0 && fl->stripe_unit == 0 &&
 39	    fl->stripe_count == 0 && fl->object_size == 0)
 40		fl->pool_id = -1;
 41}
 42EXPORT_SYMBOL(ceph_file_layout_from_legacy);
 43
 44void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
 45				struct ceph_file_layout_legacy *legacy)
 46{
 47	legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit);
 48	legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count);
 49	legacy->fl_object_size = cpu_to_le32(fl->object_size);
 50	if (fl->pool_id >= 0)
 51		legacy->fl_pg_pool = cpu_to_le32(fl->pool_id);
 52	else
 53		legacy->fl_pg_pool = 0;
 54}
 55EXPORT_SYMBOL(ceph_file_layout_to_legacy);
 56
 57int ceph_flags_to_mode(int flags)
 58{
 59	int mode;
 60
 61#ifdef O_DIRECTORY  /* fixme */
 62	if ((flags & O_DIRECTORY) == O_DIRECTORY)
 63		return CEPH_FILE_MODE_PIN;
 64#endif
 65
 66	switch (flags & O_ACCMODE) {
 67	case O_WRONLY:
 68		mode = CEPH_FILE_MODE_WR;
 69		break;
 70	case O_RDONLY:
 71		mode = CEPH_FILE_MODE_RD;
 72		break;
 73	case O_RDWR:
 74	case O_ACCMODE: /* this is what the VFS does */
 75		mode = CEPH_FILE_MODE_RDWR;
 76		break;
 77	}
 78#ifdef O_LAZY
 79	if (flags & O_LAZY)
 80		mode |= CEPH_FILE_MODE_LAZY;
 81#endif
 82
 83	return mode;
 84}
 85EXPORT_SYMBOL(ceph_flags_to_mode);
 86
 87int ceph_caps_for_mode(int mode)
 88{
 89	int caps = CEPH_CAP_PIN;
 90
 91	if (mode & CEPH_FILE_MODE_RD)
 92		caps |= CEPH_CAP_FILE_SHARED |
 93			CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
 94	if (mode & CEPH_FILE_MODE_WR)
 95		caps |= CEPH_CAP_FILE_EXCL |
 96			CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
 97			CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
 98			CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
 99	if (mode & CEPH_FILE_MODE_LAZY)
100		caps |= CEPH_CAP_FILE_LAZYIO;
101
102	return caps;
103}
104EXPORT_SYMBOL(ceph_caps_for_mode);