cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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util.c (2480B)

      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}
     42
     43void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
     44				struct ceph_file_layout_legacy *legacy)
     45{
     46	legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit);
     47	legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count);
     48	legacy->fl_object_size = cpu_to_le32(fl->object_size);
     49	if (fl->pool_id >= 0)
     50		legacy->fl_pg_pool = cpu_to_le32(fl->pool_id);
     51	else
     52		legacy->fl_pg_pool = 0;
     53}
     54
     55int ceph_flags_to_mode(int flags)
     56{
     57	int mode;
     58
     59#ifdef O_DIRECTORY  /* fixme */
     60	if ((flags & O_DIRECTORY) == O_DIRECTORY)
     61		return CEPH_FILE_MODE_PIN;
     62#endif
     63
     64	switch (flags & O_ACCMODE) {
     65	case O_WRONLY:
     66		mode = CEPH_FILE_MODE_WR;
     67		break;
     68	case O_RDONLY:
     69		mode = CEPH_FILE_MODE_RD;
     70		break;
     71	case O_RDWR:
     72	case O_ACCMODE: /* this is what the VFS does */
     73		mode = CEPH_FILE_MODE_RDWR;
     74		break;
     75	}
     76#ifdef O_LAZY
     77	if (flags & O_LAZY)
     78		mode |= CEPH_FILE_MODE_LAZY;
     79#endif
     80
     81	return mode;
     82}
     83
     84int ceph_caps_for_mode(int mode)
     85{
     86	int caps = CEPH_CAP_PIN;
     87
     88	if (mode & CEPH_FILE_MODE_RD)
     89		caps |= CEPH_CAP_FILE_SHARED |
     90			CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
     91	if (mode & CEPH_FILE_MODE_WR)
     92		caps |= CEPH_CAP_FILE_EXCL |
     93			CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
     94			CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
     95			CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
     96	if (mode & CEPH_FILE_MODE_LAZY)
     97		caps |= CEPH_CAP_FILE_LAZYIO;
     98
     99	return caps;
    100}