f7cc02b871
Now that shared inode state is locked using the cii->c_lock, the BKL is only used to protect the upcall queues used to communicate with the userspace cache manager. The remaining state is all local and we can push the lock further down into coda_upcall(). Signed-off-by: Yoshihisa Abe <yoshiabe@cs.cmu.edu> Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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* Pioctl operations for Coda.
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* Original version: (C) 1996 Peter Braam
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* Rewritten for Linux 2.1: (C) 1997 Carnegie Mellon University
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*
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* Carnegie Mellon encourages users of this code to contribute improvements
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* to the Coda project. Contact Peter Braam <coda@cs.cmu.edu>.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/namei.h>
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#include <linux/module.h>
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#include <asm/uaccess.h>
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#include <linux/coda.h>
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#include <linux/coda_linux.h>
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#include <linux/coda_fs_i.h>
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#include <linux/coda_psdev.h>
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/* pioctl ops */
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static int coda_ioctl_permission(struct inode *inode, int mask);
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static long coda_pioctl(struct file *filp, unsigned int cmd,
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unsigned long user_data);
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/* exported from this file */
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const struct inode_operations coda_ioctl_inode_operations = {
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.permission = coda_ioctl_permission,
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.setattr = coda_setattr,
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};
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const struct file_operations coda_ioctl_operations = {
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.owner = THIS_MODULE,
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.unlocked_ioctl = coda_pioctl,
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.llseek = noop_llseek,
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};
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/* the coda pioctl inode ops */
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static int coda_ioctl_permission(struct inode *inode, int mask)
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{
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return (mask & MAY_EXEC) ? -EACCES : 0;
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}
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static long coda_pioctl(struct file *filp, unsigned int cmd,
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unsigned long user_data)
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{
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struct path path;
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int error;
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struct PioctlData data;
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struct inode *inode = filp->f_dentry->d_inode;
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struct inode *target_inode = NULL;
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struct coda_inode_info *cnp;
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/* get the Pioctl data arguments from user space */
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if (copy_from_user(&data, (void __user *)user_data, sizeof(data)))
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return -EINVAL;
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/*
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* Look up the pathname. Note that the pathname is in
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* user memory, and namei takes care of this
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*/
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if (data.follow)
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error = user_path(data.path, &path);
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else
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error = user_lpath(data.path, &path);
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if (error)
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return error;
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target_inode = path.dentry->d_inode;
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/* return if it is not a Coda inode */
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if (target_inode->i_sb != inode->i_sb) {
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error = -EINVAL;
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goto out;
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}
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/* now proceed to make the upcall */
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cnp = ITOC(target_inode);
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error = venus_pioctl(inode->i_sb, &(cnp->c_fid), cmd, &data);
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out:
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path_put(&path);
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return error;
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}
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