linux-imx

// SPDX-License-Identifier: GPL-2.0

#include <linux/ceph/ceph_debug.h>

#include <linux/ceph/striper.h>

​

#include <linux/module.h>

#include <linux/sched.h>

#include <linux/slab.h>

#include <linux/file.h>

#include <linux/mount.h>

#include <linux/namei.h>

#include <linux/writeback.h>

#include <linux/falloc.h>

​

#include "super.h"

#include "mds_client.h"

#include "cache.h"

​

static __le32 ceph_flags_sys2wire(u32 flags)

{

    u32 wire_flags = 0;

​

    switch (flags & O_ACCMODE) {

    case O_RDONLY:

        wire_flags |= CEPH_O_RDONLY;

        break;

    case O_WRONLY:

        wire_flags |= CEPH_O_WRONLY;

        break;

    case O_RDWR:

        wire_flags |= CEPH_O_RDWR;

        break;

    }

​

    flags &= ~O_ACCMODE;

​

#define ceph_sys2wire(a) if (flags & a) { wire_flags |= CEPH_##a; flags &= ~a; }

​

    ceph_sys2wire(O_CREAT);

    ceph_sys2wire(O_EXCL);

    ceph_sys2wire(O_TRUNC);

    ceph_sys2wire(O_DIRECTORY);

    ceph_sys2wire(O_NOFOLLOW);

​

#undef ceph_sys2wire

​

    if (flags)

        dout("unused open flags: %x\n", flags);

​

    return cpu_to_le32(wire_flags);

}

​

/*

 * Ceph file operations

 *

 * Implement basic open/close functionality, and implement

 * read/write.

 *

 * We implement three modes of file I/O:

 *  - buffered uses the generic_file_aio_{read,write} helpers

 *

 *  - synchronous is used when there is multi-client read/write

 *    sharing, avoids the page cache, and synchronously waits for an

 *    ack from the OSD.