ceph_fs.c 1.69 KB
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/*
 * Some non-inline ceph helpers
 */
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#include <linux/module.h>
#include <linux/ceph/types.h>
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/*
 * 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;
}


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int ceph_flags_to_mode(int flags)
{
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	int mode;

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#ifdef O_DIRECTORY  /* fixme */
	if ((flags & O_DIRECTORY) == O_DIRECTORY)
		return CEPH_FILE_MODE_PIN;
#endif
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	switch (flags & O_ACCMODE) {
	case O_WRONLY:
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		mode = CEPH_FILE_MODE_WR;
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		break;
	case O_RDONLY:
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		mode = CEPH_FILE_MODE_RD;
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		break;
	case O_RDWR:
	case O_ACCMODE: /* this is what the VFS does */
		mode = CEPH_FILE_MODE_RDWR;
		break;
	}
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#ifdef O_LAZY
	if (flags & O_LAZY)
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		mode |= CEPH_FILE_MODE_LAZY;
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#endif

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	return mode;
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}
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EXPORT_SYMBOL(ceph_flags_to_mode);
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int ceph_caps_for_mode(int mode)
{
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	int caps = CEPH_CAP_PIN;

	if (mode & CEPH_FILE_MODE_RD)
		caps |= CEPH_CAP_FILE_SHARED |
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			CEPH_CAP_FILE_RD | CEPH_CAP_FILE_CACHE;
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	if (mode & CEPH_FILE_MODE_WR)
		caps |= CEPH_CAP_FILE_EXCL |
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			CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |
			CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |
			CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;
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	if (mode & CEPH_FILE_MODE_LAZY)
		caps |= CEPH_CAP_FILE_LAZYIO;

	return caps;
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}
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EXPORT_SYMBOL(ceph_caps_for_mode);