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proc_map_files_readdir(): don't bother with grabbing files 

all we need is their ->f_mode, so just collect _that_

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-08-27 14:55:26 -04:00
parent cb0942b812
commit 7b540d0646
1 changed files with 9 additions and 19 deletions
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28
fs/proc/base.c
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@ -1805,7 +1805,7 @@ out:
}
struct map_files_info {
struct file *file;
fmode_t mode;
unsigned long len;
unsigned char name[4*sizeof(long)+2]; /* max: %lx-%lx\0 */
};
@ -1814,13 +1814,10 @@ static struct dentry *
proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
struct task_struct *task, const void *ptr)
{
const struct file *file = ptr;
fmode_t mode = (fmode_t)(unsigned long)ptr;
struct proc_inode *ei;
struct inode *inode;
if (!file)
return ERR_PTR(-ENOENT);
inode = proc_pid_make_inode(dir->i_sb, task);
if (!inode)
return ERR_PTR(-ENOENT);
@ -1832,9 +1829,9 @@ proc_map_files_instantiate(struct inode *dir, struct dentry *dentry,
inode->i_size = 64;
inode->i_mode = S_IFLNK;
if (file->f_mode & FMODE_READ)
if (mode & FMODE_READ)
inode->i_mode |= S_IRUSR;
if (file->f_mode & FMODE_WRITE)
if (mode & FMODE_WRITE)
inode->i_mode |= S_IWUSR;
d_set_d_op(dentry, &tid_map_files_dentry_operations);
@ -1878,7 +1875,8 @@ static struct dentry *proc_map_files_lookup(struct inode *dir,
if (!vma)
goto out_no_vma;
result = proc_map_files_instantiate(dir, dentry, task, vma->vm_file);
result = proc_map_files_instantiate(dir, dentry, task,
(void *)(unsigned long)vma->vm_file->f_mode);
out_no_vma:
up_read(&mm->mmap_sem);
@ -1979,7 +1977,7 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
if (++pos <= filp->f_pos)
continue;
info.file = get_file(vma->vm_file);
info.mode = vma->vm_file->f_mode;
info.len = snprintf(info.name,
sizeof(info.name), "%lx-%lx",
vma->vm_start, vma->vm_end);
@ -1994,19 +1992,11 @@ proc_map_files_readdir(struct file *filp, void *dirent, filldir_t filldir)
ret = proc_fill_cache(filp, dirent, filldir,
p->name, p->len,
proc_map_files_instantiate,
task, p->file);
task,
(void *)(unsigned long)p->mode);
if (ret)
break;
filp->f_pos++;
fput(p->file);
}
for (; i < nr_files; i++) {
/*
* In case of error don't forget
* to put rest of file refs.
*/
p = flex_array_get(fa, i);
fput(p->file);
}
if (fa)
flex_array_free(fa);