* 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 as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * 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
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/string.h>
-#include <linux/smp_lock.h>
+#include <linux/sched.h>
#include <linux/inet.h>
#include <linux/idr.h>
+#include <net/9p/9p.h>
+#include <net/9p/client.h>
-#include "debug.h"
#include "v9fs.h"
-#include "9p.h"
#include "v9fs_vfs.h"
-#include "conv.h"
#include "fid.h"
/**
+ * struct p9_rdir - readdir accounting
+ * @mutex: mutex protecting readdir
+ * @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 {
+ struct mutex mutex;
+ int head;
+ int tail;
+ uint8_t *buf;
+};
+
+/**
* dt_type - return file type
* @mistat: mistat structure
*
*/
-static inline int dt_type(struct v9fs_stat *mistat)
+static inline int dt_type(struct p9_wstat *mistat)
{
unsigned long perm = mistat->mode;
int rettype = DT_REG;
- if (perm & V9FS_DMDIR)
+ if (perm & P9_DMDIR)
rettype = DT_DIR;
- if (perm & V9FS_DMSYMLINK)
+ if (perm & P9_DMSYMLINK)
rettype = DT_LNK;
return rettype;
/**
* v9fs_dir_readdir - read a directory
- * @filep: opened file structure
+ * @filp: opened file structure
* @dirent: directory structure ???
* @filldir: function to populate directory structure ???
*
static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
- struct v9fs_fcall *fcall = NULL;
- struct inode *inode = filp->f_dentry->d_inode;
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
- struct v9fs_fid *file = filp->private_data;
- unsigned int i, n;
- int fid = -1;
- int ret = 0;
- struct v9fs_stat *mi = NULL;
- int over = 0;
-
- dprintk(DEBUG_VFS, "name %s\n", filp->f_dentry->d_name.name);
-
- fid = file->fid;
-
- mi = kmalloc(v9ses->maxdata, GFP_KERNEL);
- if (!mi)
- return -ENOMEM;
-
- if (file->rdir_fcall && (filp->f_pos != file->rdir_pos)) {
- kfree(file->rdir_fcall);
- file->rdir_fcall = NULL;
- }
-
- if (file->rdir_fcall) {
- n = file->rdir_fcall->params.rread.count;
- i = file->rdir_fpos;
- while (i < n) {
- int s = v9fs_deserialize_stat(v9ses,
- file->rdir_fcall->params.rread.data + i,
- n - i, mi, v9ses->maxdata);
-
- if (s == 0) {
- dprintk(DEBUG_ERROR,
- "error while deserializing mistat\n");
- ret = -EIO;
- goto FreeStructs;
- }
-
- over = filldir(dirent, mi->name, strlen(mi->name),
- filp->f_pos, v9fs_qid2ino(&mi->qid),
- dt_type(mi));
-
- if (over) {
- file->rdir_fpos = i;
- file->rdir_pos = filp->f_pos;
- break;
- }
-
- i += s;
- filp->f_pos += s;
+ int over;
+ struct p9_wstat st;
+ int err = 0;
+ struct p9_fid *fid;
+ int buflen;
+ int reclen = 0;
+ struct p9_rdir *rdir;
+
+ P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
+ fid = filp->private_data;
+
+ buflen = fid->clnt->msize - P9_IOHDRSZ;
+
+ /* allocate rdir on demand */
+ if (!fid->rdir) {
+ rdir = kmalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
+
+ if (rdir == NULL) {
+ err = -ENOMEM;
+ goto exit;
}
-
- if (!over) {
- kfree(file->rdir_fcall);
- file->rdir_fcall = NULL;
+ spin_lock(&filp->f_dentry->d_lock);
+ if (!fid->rdir) {
+ rdir->buf = (uint8_t *)rdir + sizeof(struct p9_rdir);
+ mutex_init(&rdir->mutex);
+ rdir->head = rdir->tail = 0;
+ fid->rdir = (void *) rdir;
+ rdir = NULL;
}
+ spin_unlock(&filp->f_dentry->d_lock);
+ kfree(rdir);
}
+ rdir = (struct p9_rdir *) fid->rdir;
+
+ err = mutex_lock_interruptible(&rdir->mutex);
+ while (err == 0) {
+ if (rdir->tail == rdir->head) {
+ err = v9fs_file_readn(filp, rdir->buf, NULL,
+ buflen, filp->f_pos);
+ if (err <= 0)
+ goto unlock_and_exit;
+
+ rdir->head = 0;
+ rdir->tail = err;
+ }
- while (!over) {
- ret = v9fs_t_read(v9ses, fid, filp->f_pos,
- v9ses->maxdata-V9FS_IOHDRSZ, &fcall);
- if (ret < 0) {
- dprintk(DEBUG_ERROR, "error while reading: %d: %p\n",
- ret, fcall);
- goto FreeStructs;
- } else if (ret == 0)
- break;
-
- n = ret;
- i = 0;
- while (i < n) {
- int s = v9fs_deserialize_stat(v9ses,
- fcall->params.rread.data + i, n - i, mi,
- v9ses->maxdata);
-
- if (s == 0) {
- dprintk(DEBUG_ERROR,
- "error while deserializing mistat\n");
- return -EIO;
+ while (rdir->head < rdir->tail) {
+ err = p9stat_read(rdir->buf + rdir->head,
+ buflen - rdir->head, &st,
+ fid->clnt->dotu);
+ if (err) {
+ P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
+ err = -EIO;
+ p9stat_free(&st);
+ goto unlock_and_exit;
}
+ reclen = st.size+2;
+
+ over = filldir(dirent, st.name, strlen(st.name),
+ filp->f_pos, v9fs_qid2ino(&st.qid), dt_type(&st));
- over = filldir(dirent, mi->name, strlen(mi->name),
- filp->f_pos, v9fs_qid2ino(&mi->qid),
- dt_type(mi));
+ p9stat_free(&st);
if (over) {
- file->rdir_fcall = fcall;
- file->rdir_fpos = i;
- file->rdir_pos = filp->f_pos;
- fcall = NULL;
- break;
+ err = 0;
+ goto unlock_and_exit;
}
-
- i += s;
- filp->f_pos += s;
+ rdir->head += reclen;
+ filp->f_pos += reclen;
}
-
- kfree(fcall);
}
- FreeStructs:
- kfree(fcall);
- kfree(mi);
- return ret;
+unlock_and_exit:
+ mutex_unlock(&rdir->mutex);
+exit:
+ return err;
}
+
/**
* v9fs_dir_release - close a directory
* @inode: inode of the directory
int v9fs_dir_release(struct inode *inode, struct file *filp)
{
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
- struct v9fs_fid *fid = filp->private_data;
- int fidnum = -1;
-
- dprintk(DEBUG_VFS, "inode: %p filp: %p fid: %d\n", inode, filp,
- fid->fid);
- fidnum = fid->fid;
-
- filemap_fdatawrite(inode->i_mapping);
- filemap_fdatawait(inode->i_mapping);
-
- if (fidnum >= 0) {
- fid->fidopen--;
- dprintk(DEBUG_VFS, "fidopen: %d v9f->fid: %d\n", fid->fidopen,
- fid->fid);
-
- if (fid->fidopen == 0) {
- if (v9fs_t_clunk(v9ses, fidnum, NULL))
- dprintk(DEBUG_ERROR, "clunk failed\n");
-
- v9fs_put_idpool(fid->fid, &v9ses->fidpool);
- }
-
- kfree(fid->rdir_fcall);
-
- filp->private_data = NULL;
- v9fs_fid_destroy(fid);
- }
+ struct p9_fid *fid;
- d_drop(filp->f_dentry);
+ fid = filp->private_data;
+ P9_DPRINTK(P9_DEBUG_VFS,
+ "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
+ filemap_write_and_wait(inode->i_mapping);
+ p9_client_clunk(fid);
return 0;
}
-struct file_operations v9fs_dir_operations = {
+const struct file_operations v9fs_dir_operations = {
.read = generic_read_dir,
+ .llseek = generic_file_llseek,
.readdir = v9fs_dir_readdir,
.open = v9fs_file_open,
.release = v9fs_dir_release,
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff