On Fri, 2007-06-01 at 12:30 -0400, J. Bruce Fields wrote:
> On Thu, May 31, 2007 at 05:51:37PM -0400, Trond Myklebust wrote:
> > Why not move the security checks from setlease() into __setlease()? That
> > way you can continue to avoid the calls to (re)take the BKL, which are
> > redundant as far as fcntl_setlease() is concerned.
>
> Sure. Then setlease() just becomes a simple BKL-taking wrapper around
> __setlease(); is that what you were thinking of?
>
> --b.
Yep
Trond
>
> >From 4ce02551ab16d2812299ac0ced43652f1af0deb1 Mon Sep 17 00:00:00 2001
> From: J. Bruce Fields <[EMAIL PROTECTED]>
> Date: Thu, 31 May 2007 17:03:46 -0400
> Subject: [PATCH] locks: share more common lease code
>
> Share more code between setlease (used by nfsd) and fcntl.
>
> Also some minor cleanup.
>
> Signed-off-by: "J. Bruce Fields" <[EMAIL PROTECTED]>
> ---
> fs/locks.c | 30 ++++++++++--------------------
> 1 files changed, 10 insertions(+), 20 deletions(-)
>
> diff --git a/fs/locks.c b/fs/locks.c
> index 431a8b8..6ad3c7b 100644
> --- a/fs/locks.c
> +++ b/fs/locks.c
> @@ -1346,6 +1346,14 @@ static int __setlease(struct file *filp, long arg,
> struct file_lock **flp)
> struct inode *inode = dentry->d_inode;
> int error, rdlease_count = 0, wrlease_count = 0;
>
> + if ((current->fsuid != inode->i_uid) && !capable(CAP_LEASE))
> + return -EACCES;
> + if (!S_ISREG(inode->i_mode))
> + return -EINVAL;
> + error = security_file_lock(filp, arg);
> + if (error)
> + return error;
> +
> time_out_leases(inode);
>
> error = -EINVAL;
> @@ -1431,18 +1439,8 @@ out:
>
> int setlease(struct file *filp, long arg, struct file_lock **lease)
> {
> - struct dentry *dentry = filp->f_path.dentry;
> - struct inode *inode = dentry->d_inode;
> int error;
>
> - if ((current->fsuid != inode->i_uid) && !capable(CAP_LEASE))
> - return -EACCES;
> - if (!S_ISREG(inode->i_mode))
> - return -EINVAL;
> - error = security_file_lock(filp, arg);
> - if (error)
> - return error;
> -
> lock_kernel();
> error = __setlease(filp, arg, lease);
> unlock_kernel();
> @@ -1469,14 +1467,6 @@ int fcntl_setlease(unsigned int fd, struct file *filp,
> long arg)
> struct inode *inode = dentry->d_inode;
> int error;
>
> - if ((current->fsuid != inode->i_uid) && !capable(CAP_LEASE))
> - return -EACCES;
> - if (!S_ISREG(inode->i_mode))
> - return -EINVAL;
> - error = security_file_lock(filp, arg);
> - if (error)
> - return error;
> -
> locks_init_lock(&fl);
> error = lease_init(filp, arg, &fl);
> if (error)
> @@ -1490,9 +1480,9 @@ int fcntl_setlease(unsigned int fd, struct file *filp,
> long arg)
>
> error = fasync_helper(fd, filp, 1, &flp->fl_fasync);
> if (error < 0) {
> - /* remove lease just inserted by __setlease */
> + /* remove lease just inserted by setlease */
> flp->fl_type = F_UNLCK | F_INPROGRESS;
> - flp->fl_break_time = jiffies- 10;
> + flp->fl_break_time = jiffies - 10;
> time_out_leases(inode);
> goto out_unlock;
> }
-
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