Merge Linus master into drm-next

The merge is clean, but the arm build fails afterwards,
due to API changes in the regulator tree.

I've included the patch into the merge to fix the build.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 95 insertions, 2 deletions

diff --git a/fs/ext4/symlink.c b/fs/ext4/symlink.c
index ff3711932018..136ca0e911fd 100644
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@ -18,13 +18,101 @@
  */
 
 #include <linux/fs.h>
-#include <linux/jbd2.h>
 #include <linux/namei.h>
 #include "ext4.h"
 #include "xattr.h"
 
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
 static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
+	struct page *cpage = NULL;
+	char *caddr, *paddr = NULL;
+	struct ext4_str cstr, pstr;
+	struct inode *inode = dentry->d_inode;
+	struct ext4_fname_crypto_ctx *ctx = NULL;
+	struct ext4_encrypted_symlink_data *sd;
+	loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
+	int res;
+	u32 plen, max_size = inode->i_sb->s_blocksize;
+
+	if (!ext4_encrypted_inode(inode))
+		return page_follow_link_light(dentry, nd);
+
+	ctx = ext4_get_fname_crypto_ctx(inode, inode->i_sb->s_blocksize);
+	if (IS_ERR(ctx))
+		return ctx;
+
+	if (ext4_inode_is_fast_symlink(inode)) {
+		caddr = (char *) EXT4_I(dentry->d_inode)->i_data;
+		max_size = sizeof(EXT4_I(dentry->d_inode)->i_data);
+	} else {
+		cpage = read_mapping_page(inode->i_mapping, 0, NULL);
+		if (IS_ERR(cpage)) {
+			ext4_put_fname_crypto_ctx(&ctx);
+			return cpage;
+		}
+		caddr = kmap(cpage);
+		caddr[size] = 0;
+	}
+
+	/* Symlink is encrypted */
+	sd = (struct ext4_encrypted_symlink_data *)caddr;
+	cstr.name = sd->encrypted_path;
+	cstr.len  = le32_to_cpu(sd->len);
+	if ((cstr.len +
+	     sizeof(struct ext4_encrypted_symlink_data) - 1) >
+	    max_size) {
+		/* Symlink data on the disk is corrupted */
+		res = -EIO;
+		goto errout;
+	}
+	plen = (cstr.len < EXT4_FNAME_CRYPTO_DIGEST_SIZE*2) ?
+		EXT4_FNAME_CRYPTO_DIGEST_SIZE*2 : cstr.len;
+	paddr = kmalloc(plen + 1, GFP_NOFS);
+	if (!paddr) {
+		res = -ENOMEM;
+		goto errout;
+	}
+	pstr.name = paddr;
+	res = _ext4_fname_disk_to_usr(ctx, &cstr, &pstr);
+	if (res < 0)
+		goto errout;
+	/* Null-terminate the name */
+	if (res <= plen)
+		paddr[res] = '\0';
+	nd_set_link(nd, paddr);
+	ext4_put_fname_crypto_ctx(&ctx);
+	if (cpage) {
+		kunmap(cpage);
+		page_cache_release(cpage);
+	}
+	return NULL;
+errout:
+	ext4_put_fname_crypto_ctx(&ctx);
+	if (cpage) {
+		kunmap(cpage);
+		page_cache_release(cpage);
+	}
+	kfree(paddr);
+	return ERR_PTR(res);
+}
+
+static void ext4_put_link(struct dentry *dentry, struct nameidata *nd,
+			  void *cookie)
+{
+	struct page *page = cookie;
+
+	if (!page) {
+		kfree(nd_get_link(nd));
+	} else {
+		kunmap(page);
+		page_cache_release(page);
+	}
+}
+#endif
+
+static void *ext4_follow_fast_link(struct dentry *dentry, struct nameidata *nd)
+{
 	struct ext4_inode_info *ei = EXT4_I(dentry->d_inode);
 	nd_set_link(nd, (char *) ei->i_data);
 	return NULL;
@@ -32,8 +120,13 @@ static void *ext4_follow_link(struct dentry *dentry, struct nameidata *nd)
 
 const struct inode_operations ext4_symlink_inode_operations = {
 	.readlink	= generic_readlink,
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+	.follow_link    = ext4_follow_link,
+	.put_link       = ext4_put_link,
+#else
 	.follow_link	= page_follow_link_light,
 	.put_link	= page_put_link,
+#endif
 	.setattr	= ext4_setattr,
 	.setxattr	= generic_setxattr,
 	.getxattr	= generic_getxattr,
@@ -43,7 +136,7 @@ const struct inode_operations ext4_symlink_inode_operations = {
 
 const struct inode_operations ext4_fast_symlink_inode_operations = {
 	.readlink	= generic_readlink,
-	.follow_link	= ext4_follow_link,
+	.follow_link    = ext4_follow_fast_link,
 	.setattr	= ext4_setattr,
 	.setxattr	= generic_setxattr,
 	.getxattr	= generic_getxattr,