[GitHub/mt8127/android_kernel_alcatel_ttab.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 = 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

	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	{
	12	__u32 su = le32_to_cpu(layout->fl_stripe_unit);
	13	__u32 sc = le32_to_cpu(layout->fl_stripe_count);
	14	__u32 os = le32_to_cpu(layout->fl_object_size);
	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
	30
0dee3c28 SW	31	int ceph_flags_to_mode(int flags)
0dee3c28 SW	32	{
84d95092 SW	33	int mode;
84d95092 SW	34
0dee3c28 SW	35	#ifdef O_DIRECTORY /* fixme */
	36	if ((flags & O_DIRECTORY) == O_DIRECTORY)
	37	return CEPH_FILE_MODE_PIN;
	38	#endif
84d95092	39
38be7a79 SW	40	switch (flags & O_ACCMODE) {
38be7a79 SW	41	case O_WRONLY:
84d95092	42	mode = CEPH_FILE_MODE_WR;
38be7a79 SW	43	break;
38be7a79 SW	44	case O_RDONLY:
84d95092	45	mode = CEPH_FILE_MODE_RD;
38be7a79 SW	46	break;
	47	case O_RDWR:
	48	case O_ACCMODE: /* this is what the VFS does */
	49	mode = CEPH_FILE_MODE_RDWR;
	50	break;
	51	}
0dee3c28 SW	52	#ifdef O_LAZY
0dee3c28 SW	53	if (flags & O_LAZY)
84d95092	54	mode \|= CEPH_FILE_MODE_LAZY;
0dee3c28	55	#endif
0dee3c28	56
84d95092	57	return mode;
0dee3c28	58	}
3d14c5d2	59	EXPORT_SYMBOL(ceph_flags_to_mode);
0dee3c28 SW	60
	61	int ceph_caps_for_mode(int mode)
	62	{
84d95092 SW	63	int caps = CEPH_CAP_PIN;
	64
	65	if (mode & CEPH_FILE_MODE_RD)
	66	caps \|= CEPH_CAP_FILE_SHARED \|
0dee3c28	67	CEPH_CAP_FILE_RD \| CEPH_CAP_FILE_CACHE;
84d95092 SW	68	if (mode & CEPH_FILE_MODE_WR)
84d95092 SW	69	caps \|= CEPH_CAP_FILE_EXCL \|
0dee3c28 SW	70	CEPH_CAP_FILE_WR \| CEPH_CAP_FILE_BUFFER \|
	71	CEPH_CAP_AUTH_SHARED \| CEPH_CAP_AUTH_EXCL \|
	72	CEPH_CAP_XATTR_SHARED \| CEPH_CAP_XATTR_EXCL;
84d95092 SW	73	if (mode & CEPH_FILE_MODE_LAZY)
	74	caps \|= CEPH_CAP_FILE_LAZYIO;
	75
	76	return caps;
0dee3c28	77	}
3d14c5d2	78	EXPORT_SYMBOL(ceph_caps_for_mode);