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    Subject[PATCH 07/17] AFS: Implement the PGetFid pioctl
    Date
    From: Jacob Thebault-Spieker <summatusmentis@gmail.com>

    Implement the PGetFID pioctl for AFS. This will get the FID of a specified
    file and return it to userspace.

    This can be tested with the OpenAFS userspace tools by doing:

    fs getfid /afs

    on a mounted AFS filesystem, which should return something like:

    File /afs (1.1.0) contained in volume 1

    Signed-off-by: Jacob Thebault-Spieker <summatusmentis@gmail.com>
    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    fs/afs/pioctl.c | 30 ++++++++++++++++++++++++++++++
    include/linux/afscall.h | 3 +++
    include/linux/venus.h | 1 +
    3 files changed, 34 insertions(+), 0 deletions(-)


    diff --git a/fs/afs/pioctl.c b/fs/afs/pioctl.c
    index 6cac006..2e4f741 100644
    --- a/fs/afs/pioctl.c
    +++ b/fs/afs/pioctl.c
    @@ -10,9 +10,35 @@
    #include <linux/fs.h>
    #include <linux/afscall.h>
    #include <linux/pioctl.h>
    +#include <linux/venus.h>
    #include "internal.h"

    /*
    + * Get the AFS file identifier of a file
    + */
    +static long afs_PGetFID(struct dentry *dentry, struct vice_ioctl *arg,
    + struct key *key)
    +{
    + struct afs_vnode *vnode;
    +
    + _enter("");
    +
    + vnode = AFS_FS_I(dentry->d_inode);
    +
    + if (arg->out_size < sizeof(vnode->fid)) {
    + _leave(" = -EINVAL [%d < %zu]",
    + arg->out_size, sizeof(vnode->fid));
    + return -EINVAL;
    + }
    +
    + memcpy(arg->out, &vnode->fid, sizeof(vnode->fid));
    + arg->out_size = sizeof(vnode->fid);
    +
    + _leave(" = 0 [%d]", arg->out_size);
    + return 0;
    +}
    +
    +/*
    * The AFS path-based I/O control operation
    */
    long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
    @@ -34,6 +60,10 @@ long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
    #define VIOC_COMMAND(nr) (_VICEIOCTL(nr) & ~IOCSIZE_MASK)

    switch (cmd & ~IOCSIZE_MASK) {
    + case VIOC_COMMAND(PGetFID):
    + ret = afs_PGetFID(dentry, arg, key);
    + break;
    +
    default:
    _debug("fallback to pathless: %x", cmd);
    ret = afs_pathless_pioctl(cmd, arg);
    diff --git a/include/linux/afscall.h b/include/linux/afscall.h
    index 40cbfa5..cb006a2 100644
    --- a/include/linux/afscall.h
    +++ b/include/linux/afscall.h
    @@ -13,4 +13,7 @@

    #define AFSCALL_PIOCTL 0x14

    +/* pioctl commands */
    +#define PGetFID 22 /* get file ID */
    +
    #endif /* _LINUX_AFSCALL_H */
    diff --git a/include/linux/venus.h b/include/linux/venus.h
    index 19fe13e..ea896e4 100644
    --- a/include/linux/venus.h
    +++ b/include/linux/venus.h
    @@ -17,5 +17,6 @@
    /*
    * pioctl commands (not usable as ioctls)
    */
    +#define VIOCGETFID _VICEIOCTL(PGetFID)

    #endif /* _LINUX_VENUS_H */


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