introduce ->iterate(), ctx->pos, dir_emit()

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / readdir.c

diff --git a/fs/readdir.c b/fs/readdir.c
index 5b620a2b45e62e2c533eb897d8c58acb91a569aa..5d6578affbbf91b6d2e80b32398e8f0a53bc08ae 100644 (file)
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -24,7 +24,7 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
 {
        struct inode *inode = file_inode(file);
        int res = -ENOTDIR;
-       if (!file->f_op || !file->f_op->readdir)
+       if (!file->f_op || (!file->f_op->readdir && !file->f_op->iterate))
                goto out;
 
        res = security_file_permission(file, MAY_READ);
@@ -37,7 +37,14 @@ int iterate_dir(struct file *file, struct dir_context *ctx)
 
        res = -ENOENT;
        if (!IS_DEADDIR(inode)) {
-               res = file->f_op->readdir(file, ctx, ctx->actor);
+               if (file->f_op->iterate) {
+                       ctx->pos = file->f_pos;
+                       res = file->f_op->iterate(file, ctx);
+                       file->f_pos = ctx->pos;
+               } else {
+                       res = file->f_op->readdir(file, ctx, ctx->actor);
+                       ctx->pos = file->f_pos;
+               }
                file_accessed(file);
        }
        mutex_unlock(&inode->i_mutex);
@@ -214,7 +221,7 @@ SYSCALL_DEFINE3(getdents, unsigned int, fd,
                error = buf.error;
        lastdirent = buf.previous;
        if (lastdirent) {
-               if (put_user(f.file->f_pos, &lastdirent->d_off))
+               if (put_user(buf.ctx.pos, &lastdirent->d_off))
                        error = -EFAULT;
                else
                        error = count - buf.count;
@@ -296,7 +303,7 @@ SYSCALL_DEFINE3(getdents64, unsigned int, fd,
                error = buf.error;
        lastdirent = buf.previous;
        if (lastdirent) {
-               typeof(lastdirent->d_off) d_off = f.file->f_pos;
+               typeof(lastdirent->d_off) d_off = buf.ctx.pos;
                if (__put_user(d_off, &lastdirent->d_off))
                        error = -EFAULT;
                else