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    Subject[RFC][PATCH 14/30] r/o bind mounts: elevate write count for ncp_ioctl()
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    Date

    Cc: Dave Hansen <haveblue@us.ibm.com>
    Cc: Christoph Hellwig <hch@lst.de>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
    ---

    linux-2.6.git-dave/fs/ncpfs/ioctl.c | 54 +++++++++++++++++++++++++++++++++++-
    1 file changed, 53 insertions(+), 1 deletion(-)

    diff -puN fs/ncpfs/ioctl.c~r-o-bind-mounts-elevate-write-count-during-entire-ncp_ioctl fs/ncpfs/ioctl.c
    --- linux-2.6.git/fs/ncpfs/ioctl.c~r-o-bind-mounts-elevate-write-count-during-entire-ncp_ioctl 2008-02-08 13:04:51.000000000 -0800
    +++ linux-2.6.git-dave/fs/ncpfs/ioctl.c 2008-02-08 13:04:51.000000000 -0800
    @@ -14,6 +14,7 @@
    #include <linux/ioctl.h>
    #include <linux/time.h>
    #include <linux/mm.h>
    +#include <linux/mount.h>
    #include <linux/highuid.h>
    #include <linux/smp_lock.h>
    #include <linux/vmalloc.h>
    @@ -261,7 +262,7 @@ ncp_get_charsets(struct ncp_server* serv
    }
    #endif /* CONFIG_NCPFS_NLS */

    -int ncp_ioctl(struct inode *inode, struct file *filp,
    +static int __ncp_ioctl(struct inode *inode, struct file *filp,
    unsigned int cmd, unsigned long arg)
    {
    struct ncp_server *server = NCP_SERVER(inode);
    @@ -822,6 +823,57 @@ outrel:
    return -EINVAL;
    }

    +static int ncp_ioctl_need_write(unsigned int cmd)
    +{
    + switch (cmd) {
    + case NCP_IOC_GET_FS_INFO:
    + case NCP_IOC_GET_FS_INFO_V2:
    + case NCP_IOC_NCPREQUEST:
    + case NCP_IOC_SETDENTRYTTL:
    + case NCP_IOC_SIGN_INIT:
    + case NCP_IOC_LOCKUNLOCK:
    + case NCP_IOC_SET_SIGN_WANTED:
    + return 1;
    + case NCP_IOC_GETOBJECTNAME:
    + case NCP_IOC_SETOBJECTNAME:
    + case NCP_IOC_GETPRIVATEDATA:
    + case NCP_IOC_SETPRIVATEDATA:
    + case NCP_IOC_SETCHARSETS:
    + case NCP_IOC_GETCHARSETS:
    + case NCP_IOC_CONN_LOGGED_IN:
    + case NCP_IOC_GETDENTRYTTL:
    + case NCP_IOC_GETMOUNTUID2:
    + case NCP_IOC_SIGN_WANTED:
    + case NCP_IOC_GETROOT:
    + case NCP_IOC_SETROOT:
    + return 0;
    + default:
    + /* unkown IOCTL command, assume write */
    + return 1;
    + }
    +}
    +
    +int ncp_ioctl(struct inode *inode, struct file *filp,
    + unsigned int cmd, unsigned long arg)
    +{
    + int ret;
    +
    + if (ncp_ioctl_need_write(cmd)) {
    + /*
    + * inside the ioctl(), any failures which
    + * are because of file_permission() are
    + * -EACCESS, so it seems consistent to keep
    + * that here.
    + */
    + if (mnt_want_write(filp->f_vfsmnt))
    + return -EACCES;
    + }
    + ret = __ncp_ioctl(inode, filp, cmd, arg);
    + if (ncp_ioctl_need_write(cmd))
    + mnt_drop_write(filp->f_vfsmnt);
    + return ret;
    +}
    +
    #ifdef CONFIG_COMPAT
    long ncp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
    {
    _

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