[PATCH] prepare vfs_readdir() callers to returning filldir result

It's not the final state, but it allows moving ->readdir() instances
to passing filldir return value to caller of vfs_readdir().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 29 insertions, 33 deletions

diff --git a/fs/compat.c b/fs/compat.c
index 5f9ec44..cb36245 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -869,7 +869,7 @@ asmlinkage long compat_sys_old_readdir(unsigned int fd,
 	buf.dirent = dirent;
 
 	error = vfs_readdir(file, compat_fillonedir, &buf);
-	if (error >= 0)
+	if (buf.result)
 		error = buf.result;
 
 	fput(file);
@@ -956,9 +956,8 @@ asmlinkage long compat_sys_getdents(unsigned int fd,
 	buf.error = 0;
 
 	error = vfs_readdir(file, compat_filldir, &buf);
-	if (error < 0)
-		goto out_putf;
-	error = buf.error;
+	if (error >= 0)
+		error = buf.error;
 	lastdirent = buf.previous;
 	if (lastdirent) {
 		if (put_user(file->f_pos, &lastdirent->d_off))
@@ -966,8 +965,6 @@ asmlinkage long compat_sys_getdents(unsigned int fd,
 		else
 			error = count - buf.count;
 	}
-
-out_putf:
 	fput(file);
 out:
 	return error;
@@ -1047,19 +1044,16 @@ asmlinkage long compat_sys_getdents64(unsigned int fd,
 	buf.error = 0;
 
 	error = vfs_readdir(file, compat_filldir64, &buf);
-	if (error < 0)
-		goto out_putf;
-	error = buf.error;
+	if (error >= 0)
+		error = buf.error;
 	lastdirent = buf.previous;
 	if (lastdirent) {
 		typeof(lastdirent->d_off) d_off = file->f_pos;
-		error = -EFAULT;
 		if (__put_user_unaligned(d_off, &lastdirent->d_off))
-			goto out_putf;
-		error = count - buf.count;
+			error = -EFAULT;
+		else
+			error = count - buf.count;
 	}
-
-out_putf:
 	fput(file);
 out:
 	return error;
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index 51bdc5c..80246ba 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -280,13 +280,14 @@ static int get_name(struct vfsmount *mnt, struct dentry *dentry,
 		int old_seq = buffer.sequence;
 
 		error = vfs_readdir(file, filldir_one, &buffer);
+		if (buffer.found) {
+			error = 0;
+			break;
+		}
 
 		if (error < 0)
 			break;
 
-		error = 0;
-		if (buffer.found)
-			break;
 		error = -ENOENT;
 		if (old_seq == buffer.sequence)
 			break;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 93b22f6..e3e37f7 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1831,6 +1831,7 @@ struct buffered_dirent {
 struct readdir_data {
 	char		*dirent;
 	size_t		used;
+	int		full;
 };
 
 static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
@@ -1841,8 +1842,10 @@ static int nfsd_buffered_filldir(void *__buf, const char *name, int namlen,
 	unsigned int reclen;
 
 	reclen = ALIGN(sizeof(struct buffered_dirent) + namlen, sizeof(u64));
-	if (buf->used + reclen > PAGE_SIZE)
+	if (buf->used + reclen > PAGE_SIZE) {
+		buf->full = 1;
 		return -EINVAL;
+	}
 
 	de->namlen = namlen;
 	de->offset = offset;
@@ -1874,9 +1877,13 @@ static int nfsd_buffered_readdir(struct file *file, filldir_t func,
 		unsigned int reclen;
 
 		buf.used = 0;
+		buf.full = 0;
 
 		host_err = vfs_readdir(file, nfsd_buffered_filldir, &buf);
-		if (host_err)
+		if (buf.full)
+			host_err = 0;
+
+		if (host_err < 0)
 			break;
 
 		size = buf.used;
diff --git a/fs/readdir.c b/fs/readdir.c
index 93a7559..b318d9b 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -117,7 +117,7 @@ asmlinkage long old_readdir(unsigned int fd, struct old_linux_dirent __user * di
 	buf.dirent = dirent;
 
 	error = vfs_readdir(file, fillonedir, &buf);
-	if (error >= 0)
+	if (buf.result)
 		error = buf.result;
 
 	fput(file);
@@ -209,9 +209,8 @@ asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * diren
 	buf.error = 0;
 
 	error = vfs_readdir(file, filldir, &buf);
-	if (error < 0)
-		goto out_putf;
-	error = buf.error;
+	if (error >= 0)
+		error = buf.error;
 	lastdirent = buf.previous;
 	if (lastdirent) {
 		if (put_user(file->f_pos, &lastdirent->d_off))
@@ -219,8 +218,6 @@ asmlinkage long sys_getdents(unsigned int fd, struct linux_dirent __user * diren
 		else
 			error = count - buf.count;
 	}
-
-out_putf:
 	fput(file);
 out:
 	return error;
@@ -293,19 +290,16 @@ asmlinkage long sys_getdents64(unsigned int fd, struct linux_dirent64 __user * d
 	buf.error = 0;
 
 	error = vfs_readdir(file, filldir64, &buf);
-	if (error < 0)
-		goto out_putf;
-	error = buf.error;
+	if (error >= 0)
+		error = buf.error;
 	lastdirent = buf.previous;
 	if (lastdirent) {
 		typeof(lastdirent->d_off) d_off = file->f_pos;
-		error = -EFAULT;
 		if (__put_user(d_off, &lastdirent->d_off))
-			goto out_putf;
-		error = count - buf.count;
+			error = -EFAULT;
+		else
+			error = count - buf.count;
 	}
-
-out_putf:
 	fput(file);
 out:
 	return error;