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ceph: add file layout validation 

This tracks updates to code shared with userspace.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2009-10-09 16:38:45 -07:00
parent 13e38c8ae7
commit 752727a1b2
2 changed files with 26 additions and 0 deletions
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24
fs/ceph/ceph_fs.c
View File

@ -3,6 +3,30 @@
*/
#include "types.h"
/*
* return true if @layout appears to be valid
*/
int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
{
__u32 su = le32_to_cpu(layout->fl_stripe_unit);
__u32 sc = le32_to_cpu(layout->fl_stripe_count);
__u32 os = le32_to_cpu(layout->fl_object_size);
/* stripe unit, object size must be non-zero, 64k increment */
if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))
return 0;
if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))
return 0;
/* object size must be a multiple of stripe unit */
if (os < su || os % su)
return 0;
/* stripe count must be non-zero */
if (!sc)
return 0;
return 1;
}
int ceph_flags_to_mode(int flags)
{
#ifdef O_DIRECTORY /* fixme */

2
fs/ceph/ceph_fs.h
View File

@ -72,7 +72,9 @@ struct ceph_file_layout {
__le32 fl_pg_pool; /* namespace, crush ruleset, rep level */
} __attribute__ ((packed));
#define CEPH_MIN_STRIPE_UNIT 65536
int ceph_file_layout_is_valid(const struct ceph_file_layout *layout);
/*********************************************