[linux-block.git] / net / ceph / ceph_fs.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);
Commit	Line	Data
0dee3c28 SW	1	/*
	2	* Some non-inline ceph helpers
	3	*/
3d14c5d2 YS	4	#include <linux/module.h>
3d14c5d2 YS	5	#include <linux/ceph/types.h>
0dee3c28	6
752727a1 SW	7	/*
	8	* return true if @layout appears to be valid
	9	*/
	10	int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)
	11	{
7627151e YZ	12	__u32 su = layout->stripe_unit;
	13	__u32 sc = layout->stripe_count;
	14	__u32 os = layout->object_size;
752727a1 SW	15
	16	/* stripe unit, object size must be non-zero, 64k increment */
	17	if (!su \|\| (su & (CEPH_MIN_STRIPE_UNIT-1)))
	18	return 0;
	19	if (!os \|\| (os & (CEPH_MIN_STRIPE_UNIT-1)))
	20	return 0;
	21	/* object size must be a multiple of stripe unit */
	22	if (os < su \|\| os % su)
	23	return 0;
	24	/* stripe count must be non-zero */
	25	if (!sc)
	26	return 0;
	27	return 1;
	28	}
	29
7627151e YZ	30	void ceph_file_layout_from_legacy(struct ceph_file_layout *fl,
	31	struct ceph_file_layout_legacy *legacy)
	32	{
	33	fl->stripe_unit = le32_to_cpu(legacy->fl_stripe_unit);
	34	fl->stripe_count = le32_to_cpu(legacy->fl_stripe_count);
	35	fl->object_size = le32_to_cpu(legacy->fl_object_size);
	36	fl->pool_id = le32_to_cpu(legacy->fl_pg_pool);
	37	if (fl->pool_id == 0)
	38	fl->pool_id = -1;
	39	}
	40	EXPORT_SYMBOL(ceph_file_layout_from_legacy);
	41
	42	void ceph_file_layout_to_legacy(struct ceph_file_layout *fl,
	43	struct ceph_file_layout_legacy *legacy)
	44	{
	45	legacy->fl_stripe_unit = cpu_to_le32(fl->stripe_unit);
	46	legacy->fl_stripe_count = cpu_to_le32(fl->stripe_count);
	47	legacy->fl_object_size = cpu_to_le32(fl->object_size);
	48	if (fl->pool_id >= 0)
	49	legacy->fl_pg_pool = cpu_to_le32(fl->pool_id);
	50	else
	51	legacy->fl_pg_pool = 0;
	52	}
	53	EXPORT_SYMBOL(ceph_file_layout_to_legacy);
752727a1	54
0dee3c28 SW	55	int ceph_flags_to_mode(int flags)
0dee3c28 SW	56	{
84d95092 SW	57	int mode;
84d95092 SW	58
0dee3c28 SW	59	#ifdef O_DIRECTORY /* fixme */
	60	if ((flags & O_DIRECTORY) == O_DIRECTORY)
	61	return CEPH_FILE_MODE_PIN;
	62	#endif
84d95092	63
38be7a79 SW	64	switch (flags & O_ACCMODE) {
38be7a79 SW	65	case O_WRONLY:
84d95092	66	mode = CEPH_FILE_MODE_WR;
38be7a79 SW	67	break;
38be7a79 SW	68	case O_RDONLY:
84d95092	69	mode = CEPH_FILE_MODE_RD;
38be7a79 SW	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	}
0dee3c28 SW	76	#ifdef O_LAZY
0dee3c28 SW	77	if (flags & O_LAZY)
84d95092	78	mode \|= CEPH_FILE_MODE_LAZY;
0dee3c28	79	#endif
0dee3c28	80
84d95092	81	return mode;
0dee3c28	82	}
3d14c5d2	83	EXPORT_SYMBOL(ceph_flags_to_mode);
0dee3c28 SW	84
	85	int ceph_caps_for_mode(int mode)
	86	{
84d95092 SW	87	int caps = CEPH_CAP_PIN;
	88
	89	if (mode & CEPH_FILE_MODE_RD)
	90	caps \|= CEPH_CAP_FILE_SHARED \|
0dee3c28	91	CEPH_CAP_FILE_RD \| CEPH_CAP_FILE_CACHE;
84d95092 SW	92	if (mode & CEPH_FILE_MODE_WR)
84d95092 SW	93	caps \|= CEPH_CAP_FILE_EXCL \|
0dee3c28 SW	94	CEPH_CAP_FILE_WR \| CEPH_CAP_FILE_BUFFER \|
	95	CEPH_CAP_AUTH_SHARED \| CEPH_CAP_AUTH_EXCL \|
	96	CEPH_CAP_XATTR_SHARED \| CEPH_CAP_XATTR_EXCL;
84d95092 SW	97	if (mode & CEPH_FILE_MODE_LAZY)
	98	caps \|= CEPH_CAP_FILE_LAZYIO;
	99
	100	return caps;
0dee3c28	101	}
3d14c5d2	102	EXPORT_SYMBOL(ceph_caps_for_mode);