Subject: linux-next: manual merge of the vfs tree with the ext4 tree

From: Stephen Rothwell <[email-masked]>
Date: Tue, 14 Apr 2015 11:30:25 +1000

Hi Al,

Today's linux-next merge of the vfs tree got a conflict in
fs/ext4/symlink.c between commit f1195c72c951 ("ext4 crypto: Add
symlink encryption") from the ext4 tree and commit 5dd3dc06371a ("VFS:
normal filesystems (and lustre): d_inode() annotations") from the vfs
tree.

I fixed it up (see below) and can carry the fix as necessary (no action
is required).

P.S. is there some reason that the two copies of
"EXT4_I(dentry->d_inode)" that I fixed up below are not just
"EXT4_I(inode)" ?
-- 
Cheers,
Stephen Rothwell                    [email-masked]

diff --cc fs/ext4/symlink.c
index 408d15bc7b12,57f50091b8d1..000000000000
--- a/fs/ext4/symlink.c
+++ b/fs/ext4/symlink.c
@@@ -21,112 -21,11 +21,112 @@@
  #include <linux/namei.h>
  #include "ext4.h"
  #include "xattr.h"
 +#include "ext4_crypto.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 inode *inode = d_inode(dentry);
 +	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, plen2, max_size = inode->i_sb->s_blocksize;
 +
 +	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);
++		caddr = (char *) EXT4_I(d_inode(dentry))->i_data;
++		max_size = sizeof(EXT4_I(d_inode(dentry))->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;
 +	}
 +
 +	if (!ctx) {
 +		/* Symlink is unencrypted */
 +		plen = strnlen((char *)caddr, inode->i_sb->s_blocksize);
 +		plen2 = (plen < max_size) ? plen + 1 : plen;
 +		paddr = kmalloc(plen2, GFP_NOFS);
 +		if (!paddr) {
 +			ext4_put_fname_crypto_ctx(&ctx);
 +			kunmap(cpage);
 +			page_cache_release(cpage);
 +			return ERR_PTR(-ENOMEM);
 +		}
 +		memcpy(paddr, caddr, plen);
 +		if (plen < inode->i_sb->s_blocksize)
 +			paddr[plen] = '\0';
 +	} else {
 +		/* 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);
 +	return cpage;
 +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;
 +	char *buf = nd_get_link(nd);
 +
 +	if (page) {
 +		kunmap(page);
 +		page_cache_release(page);
 +	}
 +	if (buf) {
 +		nd_set_link(nd, NULL);
 +		kfree(buf);
 +	}
 +}
 +#endif
 +
 +static void *ext4_follow_fast_link(struct dentry *dentry, struct nameidata *nd)
 +{
- 	struct ext4_inode_info *ei = EXT4_I(dentry->d_inode);
+ 	struct ext4_inode_info *ei = EXT4_I(d_inode(dentry));
  	nd_set_link(nd, (char *) ei->i_data);
  	return NULL;
  }