linux-ext4 - [RFC PATCH 07/25] fs/inode.c: export inode_lru_list

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Date:   Mon, 23 Oct 2017 14:40:40 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     linux-fscrypt@...r.kernel.org
Cc:     linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-mtd@...ts.infradead.org, linux-api@...r.kernel.org,
        keyrings@...r.kernel.org, "Theodore Y . Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Ryo Hashimoto <hashimoto@...omium.org>,
        Sarthak Kukreti <sarthakkukreti@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Michael Halcrow <mhalcrow@...gle.com>,
        Eric Biggers <ebiggers@...gle.com>
Subject: [RFC PATCH 07/25] fs/inode.c: export inode_lru_list_del()

From: Eric Biggers <ebiggers@...gle.com>

When a filesystem encryption key is removed, we need all files which had
been "unlocked" (had ->i_crypt_info set up) with it to appear "locked"
again.  This is most easily done by evicting the inodes.  This can
currently be done using 'echo 2 > /proc/sys/vm/drop_caches'; however,
that is overkill and not usable by non-root users.  In preparation for
allowing fs/crypto/ to evict just the needed inodes, export
inode_lru_list_del() to modules.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 fs/inode.c         | 5 ++---
 include/linux/fs.h | 1 +
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index d1e35b53bb23..30ce98956801 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -420,13 +420,12 @@ void inode_add_lru(struct inode *inode)
 		inode_lru_list_add(inode);
 }
 
-
-static void inode_lru_list_del(struct inode *inode)
+void inode_lru_list_del(struct inode *inode)
 {
-
 	if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru))
 		this_cpu_dec(nr_unused);
 }
+EXPORT_SYMBOL_GPL(inode_lru_list_del);
 
 /**
  * inode_sb_list_add - add inode to the superblock list of inodes
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8cfb0877d32c..2833ace2f01d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2879,6 +2879,7 @@ static inline void lockdep_annotate_inode_mutex_key(struct inode *inode) { };
 extern void unlock_new_inode(struct inode *);
 extern unsigned int get_next_ino(void);
 extern void evict_inodes(struct super_block *sb);
+extern void inode_lru_list_del(struct inode *inode);
 
 extern void __iget(struct inode * inode);
 extern void iget_failed(struct inode *);
-- 
2.15.0.rc0.271.g36b669edcc-goog