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    Subject[PATCH 11/17] AFS: Implement the PFlushCB pioctl
    Date
    From: Wang Lei <wang840925@gmail.com>

    Implement the PFlushCB pioctl for AFS. This flushes the callback of the
    specified file, indicating to the server we're no longer interested in
    notifications of changes to that file.

    Signed-off-by: Wang Lei <wang840925@gmail.com>
    Signed-off-by: David Howells <dhowells@redhat.com>
    ---

    fs/afs/pioctl.c | 26 ++++++++++++++++++++++++++
    include/linux/afscall.h | 1 +
    include/linux/venus.h | 1 +
    3 files changed, 28 insertions(+), 0 deletions(-)


    diff --git a/fs/afs/pioctl.c b/fs/afs/pioctl.c
    index 5f6beeb..ffbec0c 100644
    --- a/fs/afs/pioctl.c
    +++ b/fs/afs/pioctl.c
    @@ -144,6 +144,28 @@ long afs_PWhereIs(struct dentry *dentry, struct vice_ioctl *arg,
    }

    /*
    + * Flush callback only
    + */
    +long afs_PFlushCB(struct dentry *dentry, struct vice_ioctl *arg,
    + struct key *key)
    +{
    + struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
    + struct afs_volume *volume = vnode->volume;
    +
    + _enter("");
    +
    + /* file servers do not grant callbacks on files from read-only
    + * volumes */
    + if (volume->type != AFSVL_ROVOL && vnode->cb_promised) {
    + afs_give_up_callback(vnode);
    + afs_flush_callback_breaks(vnode->server);
    + }
    +
    + _leave(" = 0");
    + return 0;
    +}
    +
    +/*
    * The AFS path-based I/O control operation
    */
    long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
    @@ -181,6 +203,10 @@ long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
    ret = afs_PWhereIs(dentry, arg, key);
    break;

    + case VIOC_COMMAND(PFlushCB):
    + ret = afs_PFlushCB(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 0a60cd1..00054f0 100644
    --- a/include/linux/afscall.h
    +++ b/include/linux/afscall.h
    @@ -17,6 +17,7 @@
    #define PGetVolStat 4 /* get volume status */
    #define PWhereIs 14 /* find out where a volume is located */
    #define PGetFID 22 /* get file ID */
    +#define PFlushCB 25 /* flush callback only */
    #define PGetFileCell 30 /* get the cell a file inhabits */

    #define AFS_MAXHOSTS 8 /* the maximum of hosts number */
    diff --git a/include/linux/venus.h b/include/linux/venus.h
    index 78cbf47..ea8e468 100644
    --- a/include/linux/venus.h
    +++ b/include/linux/venus.h
    @@ -20,6 +20,7 @@
    #define VIOCGETVOLSTAT _VICEIOCTL(PGetVolStat)
    #define VIOCWHEREIS _VICEIOCTL(PWhereIs)
    #define VIOCGETFID _VICEIOCTL(PGetFID)
    +#define VIOCFLUSHCB _VICEIOCTL(PFlushCB)
    #define VIOC_FILE_CELL_NAME _VICEIOCTL(PGetFileCell)

    #endif /* _LINUX_VENUS_H */


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