/**
* 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;
}
}
}
/**
* v9fs_dir_readdir_dotl - read a directory
* @filp: opened file structure
* @dirent: buffer to fill dirent structures
* @filldir: function to populate dirent structures
*
*/
static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
filldir_t filldir)
{
int over;
int err = 0;
struct p9_fid *fid;
int buflen;
struct p9_rdir *rdir;
struct p9_dirent curdirent;
u64 oldoffset = 0;
P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
fid = filp->private_data;
buflen = fid->clnt->msize - P9_READDIRHDRSZ;
err = v9fs_alloc_rdir_buf(filp, buflen);
if (err)
goto exit;
rdir = (struct p9_rdir *) fid->rdir;
err = mutex_lock_interruptible(&rdir->mutex);
if (err)
return err;
while (err == 0) {
if (rdir->tail == rdir->head) {
err = p9_client_readdir(fid, rdir->buf, buflen,
filp->f_pos);
if (err <= 0)
goto unlock_and_exit;
rdir->head = 0;
rdir->tail = err;
}
while (rdir->head < rdir->tail) {
err = p9dirent_read(rdir->buf + rdir->head,
rdir->tail - rdir->head,
&curdirent,
fid->clnt->proto_version);
if (err < 0) {
P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
err = -EIO;
goto unlock_and_exit;
}
/* d_off in dirent structure tracks the offset into
* the next dirent in the dir. However, filldir()
* expects offset into the current dirent. Hence
* while calling filldir send the offset from the
* previous dirent structure.
*/
over = filldir(dirent, curdirent.d_name,
strlen(curdirent.d_name),
oldoffset, v9fs_qid2ino(&curdirent.qid),
curdirent.d_type);
oldoffset = curdirent.d_off;
if (over) {
err = 0;
goto unlock_and_exit;
}
filp->f_pos = curdirent.d_off;
rdir->head += err;
}
}
unlock_and_exit:
mutex_unlock(&rdir->mutex);
exit:
return err;
}