linux/net/ceph/ceph_fs.c
Yan, Zheng 7627151ea3 libceph: define new ceph_file_layout structure
Define new ceph_file_layout structure and rename old ceph_file_layout
to ceph_file_layout_legacy. This is preparation for adding namespace
to ceph_file_layout structure.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
2016-07-28 02:55:36 +02:00

103 lines
2.5 KiB
C

/*
* Some non-inline ceph helpers
*/
#include <linux/module.h>
#include <linux/ceph/types.h>
/*
* return true if @layout appears to be valid
*/
int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
{
__u32 su = layout->stripe_unit;
__u32 sc = layout->stripe_count;
__u32 os = layout->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;
}
void ceph_file_layout_from_legacy(struct ceph_file_layout *fl,
struct ceph_file_layout_legacy *legacy)
{
fl->stripe_unit = le32_to_cpu(legacy->fl_stripe_unit);
fl->stripe_count = le32_to_cpu(legacy->fl_stripe_count);
fl->object_size = le32_to_cpu(legacy->fl_object_size);
fl->pool_id = le32_to_cpu(legacy->fl_pg_pool);
if (fl->pool_id == 0)
fl->pool_id = -1;
}
EXPORT_SYMBOL(ceph_file_layout_from_legacy);
void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
struct ceph_file_layout_legacy *legacy)
{
legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit);
legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count);
legacy->fl_object_size = cpu_to_le32(fl->object_size);
if (fl->pool_id >= 0)
legacy->fl_pg_pool = cpu_to_le32(fl->pool_id);
else
legacy->fl_pg_pool = 0;
}
EXPORT_SYMBOL(ceph_file_layout_to_legacy);
int ceph_flags_to_mode(int flags)
{
int mode;
#ifdef O_DIRECTORY /* fixme */
if ((flags & O_DIRECTORY) == O_DIRECTORY)
return CEPH_FILE_MODE_PIN;
#endif
switch (flags & O_ACCMODE) {
case O_WRONLY:
mode = CEPH_FILE_MODE_WR;
break;
case O_RDONLY:
mode = CEPH_FILE_MODE_RD;
break;
case O_RDWR:
case O_ACCMODE: /* this is what the VFS does */
mode = CEPH_FILE_MODE_RDWR;
break;
}
#ifdef O_LAZY
if (flags & O_LAZY)
mode |= CEPH_FILE_MODE_LAZY;
#endif
return mode;
}
EXPORT_SYMBOL(ceph_flags_to_mode);
int ceph_caps_for_mode(int mode)
{
int caps = CEPH_CAP_PIN;
if (mode & CEPH_FILE_MODE_RD)
caps |= CEPH_CAP_FILE_SHARED |
CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
if (mode & CEPH_FILE_MODE_WR)
caps |= CEPH_CAP_FILE_EXCL |
CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
if (mode & CEPH_FILE_MODE_LAZY)
caps |= CEPH_CAP_FILE_LAZYIO;
return caps;
}
EXPORT_SYMBOL(ceph_caps_for_mode);