#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 p9_stat *mistat)
+static inline int dt_type(struct p9_wstat *mistat)
{
unsigned long perm = mistat->mode;
int rettype = DT_REG;
static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
{
int over;
+ struct p9_wstat st;
+ int err = 0;
struct p9_fid *fid;
- struct v9fs_session_info *v9ses;
- struct inode *inode;
- struct p9_stat *st;
+ int buflen;
+ int reclen = 0;
+ struct p9_rdir *rdir;
P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
- inode = filp->f_path.dentry->d_inode;
- v9ses = v9fs_inode2v9ses(inode);
fid = filp->private_data;
- while ((st = p9_client_dirread(fid, filp->f_pos)) != NULL) {
- if (IS_ERR(st))
- return PTR_ERR(st);
-
- over = filldir(dirent, st->name.str, st->name.len, filp->f_pos,
- v9fs_qid2ino(&st->qid), dt_type(st));
-
- if (over)
- break;
- filp->f_pos += st->size;
- kfree(st);
- st = NULL;
+ 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;
+ }
+ 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 (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));
+
+ p9stat_free(&st);
+
+ if (over) {
+ err = 0;
+ goto unlock_and_exit;
+ }
+ rdir->head += reclen;
+ filp->f_pos += reclen;
+ }
}
- kfree(st);
- return 0;
+unlock_and_exit:
+ mutex_unlock(&rdir->mutex);
+exit:
+ return err;
}
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,