[net-next-2.6.git] / fs / ceph / ceph_fs.c

/*
 * Some non-inline ceph helpers
 */
#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)
{
	int mode;

#ifdef O_DIRECTORY  /* fixme */
	if ((flags & O_DIRECTORY) == O_DIRECTORY)
		return CEPH_FILE_MODE_PIN;
#endif
	if ((flags & O_APPEND) == O_APPEND)
		flags |= O_WRONLY;

	if ((flags & O_ACCMODE) == O_RDWR)
		mode = CEPH_FILE_MODE_RDWR;
	else if ((flags & O_ACCMODE) == O_WRONLY)
		mode = CEPH_FILE_MODE_WR;
	else
		mode = CEPH_FILE_MODE_RD;

#ifdef O_LAZY
	if (flags & O_LAZY)
		mode |= CEPH_FILE_MODE_LAZY;
#endif

	return 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;
}
Commit	Line	Data
0dee3c28 SW	1	/*
	2	* Some non-inline ceph helpers
	3	*/
	4	#include "types.h"
	5
752727a1 SW	6	/*
	7	* return true if @layout appears to be valid
	8	*/
	9	int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
	10	{
	11	__u32 su = le32_to_cpu(layout->fl_stripe_unit);
	12	__u32 sc = le32_to_cpu(layout->fl_stripe_count);
	13	__u32 os = le32_to_cpu(layout->fl_object_size);
	14
	15	/* stripe unit, object size must be non-zero, 64k increment */
	16	if (!su \|\| (su & (CEPH_MIN_STRIPE_UNIT-1)))
	17	return 0;
	18	if (!os \|\| (os & (CEPH_MIN_STRIPE_UNIT-1)))
	19	return 0;
	20	/* object size must be a multiple of stripe unit */
	21	if (os < su \|\| os % su)
	22	return 0;
	23	/* stripe count must be non-zero */
	24	if (!sc)
	25	return 0;
	26	return 1;
	27	}
	28
	29
0dee3c28 SW	30	int ceph_flags_to_mode(int flags)
0dee3c28 SW	31	{
84d95092 SW	32	int mode;
84d95092 SW	33
0dee3c28 SW	34	#ifdef O_DIRECTORY /* fixme */
	35	if ((flags & O_DIRECTORY) == O_DIRECTORY)
	36	return CEPH_FILE_MODE_PIN;
	37	#endif
84d95092 SW	38	if ((flags & O_APPEND) == O_APPEND)
	39	flags \|= O_WRONLY;
	40
	41	if ((flags & O_ACCMODE) == O_RDWR)
	42	mode = CEPH_FILE_MODE_RDWR;
	43	else if ((flags & O_ACCMODE) == O_WRONLY)
	44	mode = CEPH_FILE_MODE_WR;
	45	else
	46	mode = CEPH_FILE_MODE_RD;
	47
0dee3c28 SW	48	#ifdef O_LAZY
0dee3c28 SW	49	if (flags & O_LAZY)
84d95092	50	mode \|= CEPH_FILE_MODE_LAZY;
0dee3c28	51	#endif
0dee3c28	52
84d95092	53	return mode;
0dee3c28 SW	54	}
	55
	56	int ceph_caps_for_mode(int mode)
	57	{
84d95092 SW	58	int caps = CEPH_CAP_PIN;
	59
	60	if (mode & CEPH_FILE_MODE_RD)
	61	caps \|= CEPH_CAP_FILE_SHARED \|
0dee3c28	62	CEPH_CAP_FILE_RD \| CEPH_CAP_FILE_CACHE;
84d95092 SW	63	if (mode & CEPH_FILE_MODE_WR)
84d95092 SW	64	caps \|= CEPH_CAP_FILE_EXCL \|
0dee3c28 SW	65	CEPH_CAP_FILE_WR \| CEPH_CAP_FILE_BUFFER \|
	66	CEPH_CAP_AUTH_SHARED \| CEPH_CAP_AUTH_EXCL \|
	67	CEPH_CAP_XATTR_SHARED \| CEPH_CAP_XATTR_EXCL;
84d95092 SW	68	if (mode & CEPH_FILE_MODE_LAZY)
	69	caps \|= CEPH_CAP_FILE_LAZYIO;
	70
	71	return caps;
0dee3c28	72	}