79 lines
1.7 KiB
C
79 lines
1.7 KiB
C
/*
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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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