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-rw-r--r--fs/9p/vfs_dir.c136
1 files changed, 119 insertions, 17 deletions
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index d61e3b2..16c8a2a 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -87,29 +87,19 @@ static void p9stat_init(struct p9_wstat *stbuf)
}
/**
- * v9fs_dir_readdir - read a directory
+ * v9fs_alloc_rdir_buf - Allocate buffer used for read and readdir
* @filp: opened file structure
- * @dirent: directory structure ???
- * @filldir: function to populate directory structure ???
+ * @buflen: Length in bytes of buffer to allocate
*
*/
-static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
+static int v9fs_alloc_rdir_buf(struct file *filp, int buflen)
{
- int over;
- struct p9_wstat st;
- int err = 0;
- struct p9_fid *fid;
- int buflen;
- int reclen = 0;
struct p9_rdir *rdir;
+ struct p9_fid *fid;
+ int err = 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_IOHDRSZ;
-
- /* allocate rdir on demand */
if (!fid->rdir) {
rdir = kmalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
@@ -128,6 +118,36 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
spin_unlock(&filp->f_dentry->d_lock);
kfree(rdir);
}
+exit:
+ return err;
+}
+
+/**
+ * v9fs_dir_readdir - read a directory
+ * @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)
+{
+ 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;
+
+ err = v9fs_alloc_rdir_buf(filp, buflen);
+ if (err)
+ goto exit;
rdir = (struct p9_rdir *) fid->rdir;
err = mutex_lock_interruptible(&rdir->mutex);
@@ -146,7 +166,7 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
while (rdir->head < rdir->tail) {
p9stat_init(&st);
err = p9stat_read(rdir->buf + rdir->head,
- buflen - rdir->head, &st,
+ rdir->tail - rdir->head, &st,
fid->clnt->proto_version);
if (err) {
P9_DPRINTK(P9_DEBUG_VFS, "returned %d\n", err);
@@ -176,6 +196,88 @@ exit:
return 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,
+ buflen - 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;
+}
+
/**
* v9fs_dir_release - close a directory
@@ -207,7 +309,7 @@ const struct file_operations v9fs_dir_operations = {
const struct file_operations v9fs_dir_operations_dotl = {
.read = generic_read_dir,
.llseek = generic_file_llseek,
- .readdir = v9fs_dir_readdir,
+ .readdir = v9fs_dir_readdir_dotl,
.open = v9fs_file_open,
.release = v9fs_dir_release,
};
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