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switch inotify_user to anon_inode 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-02-11 02:24:46 -05:00
parent cccc6bba3f
commit c44dcc56d2
2 changed files with 6 additions and 54 deletions
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59
fs/notify/inotify/inotify_user.c
View File

@ -29,14 +29,12 @@
#include <linux/init.h> /* module_init */
#include <linux/inotify.h>
#include <linux/kernel.h> /* roundup() */
#include <linux/magic.h> /* superblock magic number */
#include <linux/mount.h> /* mntget */
#include <linux/namei.h> /* LOOKUP_FOLLOW */
#include <linux/path.h> /* struct path */
#include <linux/sched.h> /* struct user */
#include <linux/slab.h> /* struct kmem_cache */
#include <linux/syscalls.h>
#include <linux/types.h>
#include <linux/anon_inodes.h>
#include <linux/uaccess.h>
#include <linux/poll.h>
#include <linux/wait.h>
@ -45,8 +43,6 @@
#include <asm/ioctls.h>
static struct vfsmount *inotify_mnt __read_mostly;
/* these are configurable via /proc/sys/fs/inotify/ */
static int inotify_max_user_instances __read_mostly;
static int inotify_max_queued_events __read_mostly;
@ -645,9 +641,7 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
{
struct fsnotify_group *group;
struct user_struct *user;
struct file *filp;
struct path path;
int fd, ret;
int ret;
/* Check the IN_* constants for consistency. */
BUILD_BUG_ON(IN_CLOEXEC != O_CLOEXEC);
@ -656,10 +650,6 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
if (flags & ~(IN_CLOEXEC | IN_NONBLOCK))
return -EINVAL;
fd = get_unused_fd_flags(flags & O_CLOEXEC);
if (fd < 0)
return fd;
user = get_current_user();
if (unlikely(atomic_read(&user->inotify_devs) >=
inotify_max_user_instances)) {
@ -676,27 +666,14 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
atomic_inc(&user->inotify_devs);
path.mnt = inotify_mnt;
path.dentry = inotify_mnt->mnt_root;
path_get(&path);
filp = alloc_file(&path, FMODE_READ, &inotify_fops);
if (!filp)
goto Enfile;
ret = anon_inode_getfd("inotify", &inotify_fops, group,
O_RDONLY | flags);
if (ret >= 0)
return ret;
filp->f_flags = O_RDONLY | (flags & O_NONBLOCK);
filp->private_data = group;
fd_install(fd, filp);
return fd;
Enfile:
ret = -ENFILE;
path_put(&path);
atomic_dec(&user->inotify_devs);
out_free_uid:
free_uid(user);
put_unused_fd(fd);
return ret;
}
@ -783,20 +760,6 @@ out:
return ret;
}
static int
inotify_get_sb(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_pseudo(fs_type, "inotify", NULL,
INOTIFYFS_SUPER_MAGIC, mnt);
}
static struct file_system_type inotify_fs_type = {
.name = "inotifyfs",
.get_sb = inotify_get_sb,
.kill_sb = kill_anon_super,
};
/*
* inotify_user_setup - Our initialization function. Note that we cannnot return
* error because we have compiled-in VFS hooks. So an (unlikely) failure here
@ -804,16 +767,6 @@ static struct file_system_type inotify_fs_type = {
*/
static int __init inotify_user_setup(void)
{
int ret;
ret = register_filesystem(&inotify_fs_type);
if (unlikely(ret))
panic("inotify: register_filesystem returned %d!\n", ret);
inotify_mnt = kern_mount(&inotify_fs_type);
if (IS_ERR(inotify_mnt))
panic("inotify: kern_mount ret %ld!\n", PTR_ERR(inotify_mnt));
inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark_entry, SLAB_PANIC);
event_priv_cachep = KMEM_CACHE(inotify_event_private_data, SLAB_PANIC);

1
include/linux/magic.h
View File

@ -52,7 +52,6 @@
#define CGROUP_SUPER_MAGIC 0x27e0eb
#define FUTEXFS_SUPER_MAGIC 0xBAD1DEA
#define INOTIFYFS_SUPER_MAGIC 0x2BAD1DEA
#define STACK_END_MAGIC 0x57AC6E9D