1d957f9bf8
* Add path_put() functions for releasing a reference to the dentry and vfsmount of a struct path in the right order * Switch from path_release(nd) to path_put(&nd->path) * Rename dput_path() to path_put_conditional() [akpm@linux-foundation.org: fix cifs] Signed-off-by: Jan Blunck <jblunck@suse.de> Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Acked-by: Christoph Hellwig <hch@lst.de> Cc: <linux-fsdevel@vger.kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Steven French <sfrench@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <asm/uaccess.h>
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#include "spufs.h"
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/**
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* sys_spu_run - run code loaded into an SPU
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*
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* @unpc: next program counter for the SPU
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* @ustatus: status of the SPU
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*
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* This system call transfers the control of execution of a
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* user space thread to an SPU. It will return when the
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* SPU has finished executing or when it hits an error
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* condition and it will be interrupted if a signal needs
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* to be delivered to a handler in user space.
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*
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* The next program counter is set to the passed value
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* before the SPU starts fetching code and the user space
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* pointer gets updated with the new value when returning
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* from kernel space.
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*
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* The status value returned from spu_run reflects the
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* value of the spu_status register after the SPU has stopped.
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*
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*/
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static long do_spu_run(struct file *filp,
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__u32 __user *unpc,
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__u32 __user *ustatus)
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{
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long ret;
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struct spufs_inode_info *i;
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u32 npc, status;
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ret = -EFAULT;
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if (get_user(npc, unpc))
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goto out;
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/* check if this file was created by spu_create */
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ret = -EINVAL;
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if (filp->f_op != &spufs_context_fops)
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goto out;
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i = SPUFS_I(filp->f_path.dentry->d_inode);
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ret = spufs_run_spu(i->i_ctx, &npc, &status);
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if (put_user(npc, unpc))
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ret = -EFAULT;
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if (ustatus && put_user(status, ustatus))
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ret = -EFAULT;
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out:
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return ret;
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}
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static long do_spu_create(const char __user *pathname, unsigned int flags,
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mode_t mode, struct file *neighbor)
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{
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char *tmp;
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int ret;
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tmp = getname(pathname);
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ret = PTR_ERR(tmp);
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if (!IS_ERR(tmp)) {
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struct nameidata nd;
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ret = path_lookup(tmp, LOOKUP_PARENT|
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LOOKUP_OPEN|LOOKUP_CREATE, &nd);
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if (!ret) {
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ret = spufs_create(&nd, flags, mode, neighbor);
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path_put(&nd.path);
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}
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putname(tmp);
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}
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return ret;
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}
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struct spufs_calls spufs_calls = {
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.create_thread = do_spu_create,
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.spu_run = do_spu_run,
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.coredump_extra_notes_size = spufs_coredump_extra_notes_size,
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.coredump_extra_notes_write = spufs_coredump_extra_notes_write,
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.notify_spus_active = do_notify_spus_active,
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.owner = THIS_MODULE,
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};
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