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[readdir] convert procfs

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2013-05-16 12:07:31 -04:00
parent 68c6147113
commit f0c3b5093a
9 changed files with 283 additions and 488 deletions
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fs/proc/namespaces.c
+18 -56
View File
@@ -213,74 +213,36 @@ out:
return error;
}
static int proc_ns_fill_cache(struct file *filp, void *dirent,
filldir_t filldir, struct task_struct *task,
const struct proc_ns_operations *ops)
static int proc_ns_dir_readdir(struct file *file, struct dir_context *ctx)
{
return proc_fill_cache(filp, dirent, filldir,
ops->name, strlen(ops->name),
proc_ns_instantiate, task, ops);
}
static int proc_ns_dir_readdir(struct file *filp, void *dirent,
filldir_t filldir)
{
int i;
struct dentry *dentry = filp->f_path.dentry;
struct inode *inode = dentry->d_inode;
struct task_struct *task = get_proc_task(inode);
struct task_struct *task = get_proc_task(file_inode(file));
const struct proc_ns_operations **entry, **last;
ino_t ino;
int ret;
ret = -ENOENT;
if (!task)
goto out_no_task;
return -ENOENT;
ret = 0;
i = filp->f_pos;
switch (i) {
case 0:
ino = inode->i_ino;
if (filldir(dirent, ".", 1, i, ino, DT_DIR) < 0)
goto out;
i++;
filp->f_pos++;
/* fall through */
case 1:
ino = parent_ino(dentry);
if (filldir(dirent, "..", 2, i, ino, DT_DIR) < 0)
goto out;
i++;
filp->f_pos++;
/* fall through */
default:
i -= 2;
if (i >= ARRAY_SIZE(ns_entries)) {
ret = 1;
goto out;
}
entry = ns_entries + i;
last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
while (entry <= last) {
if (proc_ns_fill_cache(filp, dirent, filldir,
task, *entry) < 0)
goto out;
filp->f_pos++;
entry++;
}
if (!dir_emit_dots(file, ctx))
goto out;
if (ctx->pos >= 2 + ARRAY_SIZE(ns_entries))
goto out;
entry = ns_entries + (ctx->pos - 2);
last = &ns_entries[ARRAY_SIZE(ns_entries) - 1];
while (entry <= last) {
const struct proc_ns_operations *ops = *entry;
if (!proc_fill_cache(file, ctx, ops->name, strlen(ops->name),
proc_ns_instantiate, task, ops))
break;
ctx->pos++;
entry++;
}
ret = 1;
out:
put_task_struct(task);
out_no_task:
return ret;
return 0;
}
const struct file_operations proc_ns_dir_operations = {
.read = generic_read_dir,
.readdir = proc_ns_dir_readdir,
.iterate = proc_ns_dir_readdir,
};
static struct dentry *proc_ns_dir_lookup(struct inode *dir,