Release 4.11 fs/9p/vfs_dir.c

/*
 * linux/fs/9p/vfs_dir.c
 *
 * This file contains vfs directory ops for the 9P2000 protocol.
 *
 *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
 *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to:
 *  Free Software Foundation
 *  51 Franklin Street, Fifth Floor
 *  Boston, MA  02111-1301  USA
 *
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/inet.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/uio.h>
#include <net/9p/9p.h>
#include <net/9p/client.h>

#include "v9fs.h"
#include "v9fs_vfs.h"
#include "fid.h"

/**
 * struct p9_rdir - readdir accounting
 * @head: start offset of current dirread buffer
 * @tail: end offset of current dirread buffer
 * @buf: dirread buffer
 *
 * private structure for keeping track of readdir
 * allocated on demand
 */


struct p9_rdir {
	
int head;
	
int tail;
	
uint8_t buf[];
};

/**
 * dt_type - return file type
 * @mistat: mistat structure
 *
 */



static inline int dt_type(struct p9_wstat *mistat)
{
	unsigned long perm = mistat->mode;
	int rettype = DT_REG;

	if (perm & P9_DMDIR)
		rettype = DT_DIR;
	if (perm & P9_DMSYMLINK)
		rettype = DT_LNK;

	return rettype;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Van Hensbergen
46
95.83%
2
66.67%
Latchesar Ionkov
2
4.17%
1
33.33%
Total
48
100.00%
3
100.00%



static void p9stat_init(struct p9_wstat *stbuf)
{
	stbuf->name  = NULL;
	stbuf->uid   = NULL;
	stbuf->gid   = NULL;
	stbuf->muid  = NULL;
	stbuf->extension = NULL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Aneesh Kumar K.V
41
100.00%
1
100.00%
Total
41
100.00%
1
100.00%

/**
 * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir
 * @filp: opened file structure
 * @buflen: Length in bytes of buffer to allocate
 *
 */



static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen)
{
	struct p9_fid *fid = filp->private_data;
	if (!fid->rdir)
		fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
	return fid->rdir;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Van Hensbergen
39
72.22%
3
50.00%
Al Viro
8
14.81%
1
16.67%
Sripathi Kodi
5
9.26%
1
16.67%
Latchesar Ionkov
2
3.70%
1
16.67%
Total
54
100.00%
6
100.00%

/**
 * v9fs_dir_readdir - iterate through a directory
 * @file: opened file structure
 * @ctx: actor we feed the entries to
 *
 */



static int v9fs_dir_readdir(struct file *file, struct dir_context *ctx)
{
	bool over;
	struct p9_wstat st;
	int err = 0;
	struct p9_fid *fid;
	int buflen;
	int reclen = 0;
	struct p9_rdir *rdir;
	struct kvec kvec;

	p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
	fid = file->private_data;

	buflen = fid->clnt->msize - P9_IOHDRSZ;

	rdir = v9fs_alloc_rdir_buf(file, buflen);
	if (!rdir)
		return -ENOMEM;
	kvec.iov_base = rdir->buf;
	kvec.iov_len = buflen;

	while (1) {
		if (rdir->tail == rdir->head) {
			struct iov_iter to;
			int n;
			iov_iter_kvec(&to, READ | ITER_KVEC, &kvec, 1, buflen);
			n = p9_client_read(file->private_data, ctx->pos, &to,
					   &err);
			if (err)
				return err;
			if (n == 0)
				return 0;

			rdir->head = 0;
			rdir->tail = n;
		}
		while (rdir->head < rdir->tail) {
			p9stat_init(&st);
			err = p9stat_read(fid->clnt, rdir->buf + rdir->head,
					  rdir->tail - rdir->head, &st);
			if (err) {
				p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
				p9stat_free(&st);
				return -EIO;
			}
			reclen = st.size+2;

			over = !dir_emit(ctx, st.name, strlen(st.name),
					 v9fs_qid2ino(&st.qid), dt_type(&st));
			p9stat_free(&st);
			if (over)
				return 0;

			rdir->head += reclen;
			ctx->pos += reclen;
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Van Hensbergen
148
44.44%
5
27.78%
Al Viro
81
24.32%
4
22.22%
Sripathi Kodi
70
21.02%
1
5.56%
Aneesh Kumar K.V
10
3.00%
2
11.11%
Johannes Berg
9
2.70%
1
5.56%
Latchesar Ionkov
7
2.10%
2
11.11%
Martin Stava
3
0.90%
1
5.56%
Dan Carpenter
3
0.90%
1
5.56%
Joe Perches
2
0.60%
1
5.56%
Total
333
100.00%
18
100.00%

/**
 * v9fs_dir_readdir_dotl - iterate through a directory
 * @file: opened file structure
 * @ctx: actor we feed the entries to
 *
 */


static int v9fs_dir_readdir_dotl(struct file *file, struct dir_context *ctx)
{
	int err = 0;
	struct p9_fid *fid;
	int buflen;
	struct p9_rdir *rdir;
	struct p9_dirent curdirent;

	p9_debug(P9_DEBUG_VFS, "name %pD\n", file);
	fid = file->private_data;

	buflen = fid->clnt->msize - P9_READDIRHDRSZ;

	rdir = v9fs_alloc_rdir_buf(file, buflen);
	if (!rdir)
		return -ENOMEM;

	while (1) {
		if (rdir->tail == rdir->head) {
			err = p9_client_readdir(fid, rdir->buf, buflen,
						ctx->pos);
			if (err <= 0)
				return err;

			rdir->head = 0;
			rdir->tail = err;
		}

		while (rdir->head < rdir->tail) {

			err = p9dirent_read(fid->clnt, rdir->buf + rdir->head,
					    rdir->tail - rdir->head,
					    &curdirent);
			if (err < 0) {
				p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
				return -EIO;
			}

			if (!dir_emit(ctx, curdirent.d_name,
				      strlen(curdirent.d_name),
				      v9fs_qid2ino(&curdirent.qid),
				      curdirent.d_type))
				return 0;

			ctx->pos = curdirent.d_off;
			rdir->head += err;
		}
	}
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Sripathi Kodi
211
85.77%
2
28.57%
Al Viro
29
11.79%
3
42.86%
Aneesh Kumar K.V
4
1.63%
1
14.29%
Joe Perches
2
0.81%
1
14.29%
Total
246
100.00%
7
100.00%

/**
 * v9fs_dir_release - close a directory
 * @inode: inode of the directory
 * @filp: file pointer to a directory
 *
 */



int v9fs_dir_release(struct inode *inode, struct file *filp)
{
	struct p9_fid *fid;

	fid = filp->private_data;
	p9_debug(P9_DEBUG_VFS, "inode: %p filp: %p fid: %d\n",
		 inode, filp, fid ? fid->fid : -1);
	if (fid)
		p9_client_clunk(fid);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Van Hensbergen
37
63.79%
1
20.00%
Latchesar Ionkov
10
17.24%
2
40.00%
Venkateswararao Jujjuri (JV)
9
15.52%
1
20.00%
Joe Perches
2
3.45%
1
20.00%
Total
58
100.00%
5
100.00%


const struct file_operations v9fs_dir_operations = {
	.read = generic_read_dir,
	.llseek = generic_file_llseek,
	.iterate_shared = v9fs_dir_readdir,
	.open = v9fs_file_open,
	.release = v9fs_dir_release,
};


const struct file_operations v9fs_dir_operations_dotl = {
	.read = generic_read_dir,
	.llseek = generic_file_llseek,
	.iterate_shared = v9fs_dir_readdir_dotl,
	.open = v9fs_file_open,
	.release = v9fs_dir_release,
        .fsync = v9fs_file_fsync_dotl,
};
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Eric Van Hensbergen
347
37.76%
6
19.35%
Sripathi Kodi
318
34.60%
3
9.68%
Al Viro
134
14.58%
7
22.58%
Aneesh Kumar K.V
55
5.98%
2
6.45%
Latchesar Ionkov
25
2.72%
4
12.90%
Venkateswararao Jujjuri (JV)
14
1.52%
2
6.45%
Johannes Berg
9
0.98%
1
3.23%
Joe Perches
6
0.65%
1
3.23%
Martin Stava
3
0.33%
1
3.23%
Dan Carpenter
3
0.33%
1
3.23%
Tejun Heo
3
0.33%
1
3.23%
Arjan van de Ven
1
0.11%
1
3.23%
Fabian Frederick
1
0.11%
1
3.23%
Total
919
100.00%
31
100.00%
Directory: fs/9p

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.