ceph_fs.c

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/*
 * 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);