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This commit is contained in:
Fabio Belavenuto
248
addons/9p/src/4.4.180/vfs_dir.c
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248
addons/9p/src/4.4.180/vfs_dir.c
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/*
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* linux/fs/9p/vfs_dir.c
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*
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* This file contains vfs directory ops for the 9P2000 protocol.
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*
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* Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
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* Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/fs.h>
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#include <linux/file.h>
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#include <linux/stat.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/inet.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/uio.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "v9fs.h"
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#include "v9fs_vfs.h"
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#include "fid.h"
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/**
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* struct p9_rdir - readdir accounting
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* @head: start offset of current dirread buffer
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* @tail: end offset of current dirread buffer
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* @buf: dirread buffer
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*
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* private structure for keeping track of readdir
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* allocated on demand
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*/
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struct p9_rdir {
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int head;
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int tail;
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uint8_t buf[];
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};
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/**
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* dt_type - return file type
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* @mistat: mistat structure
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*
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*/
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static inline int dt_type(struct p9_wstat *mistat)
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{
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unsigned long perm = mistat->mode;
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int rettype = DT_REG;
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if (perm & P9_DMDIR)
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rettype = DT_DIR;
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if (perm & P9_DMSYMLINK)
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rettype = DT_LNK;
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return rettype;
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}
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/**
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* v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir
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* @filp: opened file structure
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* @buflen: Length in bytes of buffer to allocate
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*
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*/
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static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen)
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{
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struct p9_fid *fid = filp->private_data;
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if (!fid->rdir)
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fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
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return fid->rdir;
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}
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/**
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* v9fs_dir_readdir - iterate through a directory
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* @file: opened file structure
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* @ctx: actor we feed the entries to
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*
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*/
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static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
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{
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bool over;
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struct p9_wstat st;
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int err = 0;
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struct p9_fid *fid;
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int buflen;
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struct p9_rdir *rdir;
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struct kvec kvec;
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p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
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fid = file->private_data;
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buflen = fid->clnt->msize - P9_IOHDRSZ;
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rdir = v9fs_alloc_rdir_buf(file, buflen);
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if (!rdir)
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return -ENOMEM;
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kvec.iov_base = rdir->buf;
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kvec.iov_len = buflen;
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while (1) {
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if (rdir->tail == rdir->head) {
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struct iov_iter to;
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int n;
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iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buflen);
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n = p9_client_read(file->private_data, ctx->pos, &to,
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&err);
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if (err)
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return err;
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if (n == 0)
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return 0;
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rdir->head = 0;
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rdir->tail = n;
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}
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while (rdir->head < rdir->tail) {
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err = p9stat_read(fid->clnt, rdir->buf + rdir->head,
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rdir->tail - rdir->head, &st);
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if (err <= 0) {
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p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
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return -EIO;
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}
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over = !dir_emit(ctx, st.name, strlen(st.name),
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v9fs_qid2ino(&st.qid), dt_type(&st));
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p9stat_free(&st);
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if (over)
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return 0;
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rdir->head += err;
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ctx->pos += err;
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}
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}
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}
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/**
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* v9fs_dir_readdir_dotl - iterate through a directory
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* @file: opened file structure
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* @ctx: actor we feed the entries to
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*
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*/
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static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx)
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{
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int err = 0;
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struct p9_fid *fid;
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int buflen;
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struct p9_rdir *rdir;
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struct p9_dirent curdirent;
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p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
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fid = file->private_data;
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buflen = fid->clnt->msize - P9_READDIRHDRSZ;
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rdir = v9fs_alloc_rdir_buf(file, buflen);
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if (!rdir)
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return -ENOMEM;
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while (1) {
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if (rdir->tail == rdir->head) {
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err = p9_client_readdir(fid, rdir->buf, buflen,
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ctx->pos);
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if (err <= 0)
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return err;
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rdir->head = 0;
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rdir->tail = err;
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}
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while (rdir->head < rdir->tail) {
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err = p9dirent_read(fid->clnt, rdir->buf + rdir->head,
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rdir->tail - rdir->head,
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&curdirent);
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if (err < 0) {
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p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
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return -EIO;
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}
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if (!dir_emit(ctx, curdirent.d_name,
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strlen(curdirent.d_name),
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v9fs_qid2ino(&curdirent.qid),
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curdirent.d_type))
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return 0;
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ctx->pos = curdirent.d_off;
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rdir->head += err;
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}
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}
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}
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/**
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* v9fs_dir_release - close a directory
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* @inode: inode of the directory
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* @filp: file pointer to a directory
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*
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*/
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int v9fs_dir_release(struct inode *inode, struct file *filp)
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{
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struct p9_fid *fid;
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fid = filp->private_data;
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p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n",
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inode, filp, fid ? fid->fid : -1);
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if (fid)
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p9_client_clunk(fid);
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return 0;
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}
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const struct file_operations v9fs_dir_operations = {
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.read = generic_read_dir,
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.llseek = generic_file_llseek,
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.iterate = v9fs_dir_readdir,
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.open = v9fs_file_open,
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.release = v9fs_dir_release,
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};
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const struct file_operations v9fs_dir_operations_dotl = {
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.read = generic_read_dir,
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.llseek = generic_file_llseek,
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.iterate = v9fs_dir_readdir_dotl,
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.open = v9fs_file_open,
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.release = v9fs_dir_release,
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.fsync = v9fs_file_fsync_dotl,
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};
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