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3d18f80ce1
kern_path_locked() is now only used to prepare for removing an object from the filesystem (and that is the only credible reason for wanting a positive locked dentry). Thus it corresponds to kern_path_create() and so should have a corresponding name. Unfortunately the name "kern_path_create" is somewhat misleading as it doesn't actually create anything. The recently added simple_start_creating() provides a better pattern I believe. The "start" can be matched with "end" to bracket the creating or removing. So this patch changes names: kern_path_locked -> start_removing_path kern_path_create -> start_creating_path user_path_create -> start_creating_user_path user_path_locked_at -> start_removing_user_path_at done_path_create -> end_creating_path and also introduces end_removing_path() which is identical to end_creating_path(). __start_removing_path (which was __kern_path_locked) is enhanced to call mnt_want_write() for consistency with the start_creating_path(). Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: NeilBrown <neil@brown.name> Signed-off-by: Christian Brauner <brauner@kernel.org>
90 lines
2.2 KiB
C
90 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/file.h>
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#include <linux/fs.h>
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#include <linux/export.h>
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#include <linux/mount.h>
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#include <linux/namei.h>
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#include <linux/slab.h>
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#include <linux/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(file_inode(filp));
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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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umode_t mode, struct file *neighbor)
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{
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struct path path;
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struct dentry *dentry;
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int ret;
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dentry = start_creating_user_path(AT_FDCWD, pathname, &path, LOOKUP_DIRECTORY);
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ret = PTR_ERR(dentry);
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if (!IS_ERR(dentry)) {
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ret = spufs_create(&path, dentry, flags, mode, neighbor);
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end_creating_path(&path, dentry);
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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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.notify_spus_active = do_notify_spus_active,
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.owner = THIS_MODULE,
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#ifdef CONFIG_COREDUMP
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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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#endif
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};
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