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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/net/ceph/ceph_fs.c
15109 views
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/*

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 * Some non-inline ceph helpers

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 */

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#include <linux/module.h>

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#include <linux/ceph/types.h>

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/*

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 * return true if @layout appears to be valid

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 */

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int ceph_file_layout_is_valid(const struct ceph_file_layout *layout)

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{

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	__u32 su = le32_to_cpu(layout->fl_stripe_unit);

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	__u32 sc = le32_to_cpu(layout->fl_stripe_count);

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	__u32 os = le32_to_cpu(layout->fl_object_size);

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	/* stripe unit, object size must be non-zero, 64k increment */

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	if (!su || (su & (CEPH_MIN_STRIPE_UNIT-1)))

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		return 0;

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	if (!os || (os & (CEPH_MIN_STRIPE_UNIT-1)))

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		return 0;

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	/* object size must be a multiple of stripe unit */

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	if (os < su || os % su)

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		return 0;

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	/* stripe count must be non-zero */

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	if (!sc)

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		return 0;

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	return 1;

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}

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int ceph_flags_to_mode(int flags)

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{

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	int mode;

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#ifdef O_DIRECTORY  /* fixme */

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	if ((flags & O_DIRECTORY) == O_DIRECTORY)

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		return CEPH_FILE_MODE_PIN;

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#endif

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	switch (flags & O_ACCMODE) {

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	case O_WRONLY:

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		mode = CEPH_FILE_MODE_WR;

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		break;

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	case O_RDONLY:

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		mode = CEPH_FILE_MODE_RD;

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		break;

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	case O_RDWR:

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	case O_ACCMODE: /* this is what the VFS does */

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		mode = CEPH_FILE_MODE_RDWR;

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		break;

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	}

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#ifdef O_LAZY

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	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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{

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	int caps = CEPH_CAP_PIN;

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	if (mode & CEPH_FILE_MODE_RD)

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		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)

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		caps |= CEPH_CAP_FILE_EXCL |

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			CEPH_CAP_FILE_WR | CEPH_CAP_FILE_BUFFER |

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			CEPH_CAP_AUTH_SHARED | CEPH_CAP_AUTH_EXCL |

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			CEPH_CAP_XATTR_SHARED | CEPH_CAP_XATTR_EXCL;

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	if (mode & CEPH_FILE_MODE_LAZY)

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		caps |= CEPH_CAP_FILE_LAZYIO;

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	return caps;

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}

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EXPORT_SYMBOL(ceph_caps_for_mode);

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