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Subject[PATCH 34/39] Revert "vfs: update ovl inode before relatime check"
Date
This reverts commit 598e3c8f72f5b77c84d2cb26cfd936ffb3cfdbaa.

Overlayfs no longer relies on the vfs correct atime handling.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
fs/inode.c | 33 ++++++---------------------------
fs/internal.h | 7 -------
fs/namei.c | 2 +-
include/linux/fs.h | 1 +
4 files changed, 8 insertions(+), 35 deletions(-)

diff --git a/fs/inode.c b/fs/inode.c
index ad0259bafe2d..348e93f468cc 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1553,37 +1553,17 @@ sector_t bmap(struct inode *inode, sector_t block)
}
EXPORT_SYMBOL(bmap);

-/*
- * Update times in overlayed inode from underlying real inode
- */
-static void update_ovl_inode_times(struct dentry *dentry, struct inode *inode,
- bool rcu)
-{
- if (!rcu) {
- struct inode *realinode = d_real_inode(dentry);
-
- if (unlikely(inode != realinode) &&
- (!timespec_equal(&inode->i_mtime, &realinode->i_mtime) ||
- !timespec_equal(&inode->i_ctime, &realinode->i_ctime))) {
- inode->i_mtime = realinode->i_mtime;
- inode->i_ctime = realinode->i_ctime;
- }
- }
-}
-
/*
* With relative atime, only update atime if the previous atime is
* earlier than either the ctime or mtime or if at least a day has
* passed since the last atime update.
*/
-static int relatime_need_update(const struct path *path, struct inode *inode,
- struct timespec now, bool rcu)
+static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
+ struct timespec now)
{

- if (!(path->mnt->mnt_flags & MNT_RELATIME))
+ if (!(mnt->mnt_flags & MNT_RELATIME))
return 1;
-
- update_ovl_inode_times(path->dentry, inode, rcu);
/*
* Is mtime younger than atime? If yes, update atime:
*/
@@ -1654,8 +1634,7 @@ static int update_time(struct inode *inode, struct timespec *time, int flags)
* This function automatically handles read only file systems and media,
* as well as the "noatime" flag and inode specific "noatime" markers.
*/
-bool __atime_needs_update(const struct path *path, struct inode *inode,
- bool rcu)
+bool atime_needs_update(const struct path *path, struct inode *inode)
{
struct vfsmount *mnt = path->mnt;
struct timespec now;
@@ -1681,7 +1660,7 @@ bool __atime_needs_update(const struct path *path, struct inode *inode,

now = current_time(inode);

- if (!relatime_need_update(path, inode, now, rcu))
+ if (!relatime_need_update(mnt, inode, now))
return false;

if (timespec_equal(&inode->i_atime, &now))
@@ -1696,7 +1675,7 @@ void touch_atime(const struct path *path)
struct inode *inode = d_inode(path->dentry);
struct timespec now;

- if (!__atime_needs_update(path, inode, false))
+ if (!atime_needs_update(path, inode))
return;

if (!sb_start_write_trylock(inode->i_sb))
diff --git a/fs/internal.h b/fs/internal.h
index 29c9a2fab592..6ada1f356da6 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -138,13 +138,6 @@ extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
extern void inode_add_lru(struct inode *inode);
extern int dentry_needs_remove_privs(struct dentry *dentry);

-extern bool __atime_needs_update(const struct path *, struct inode *, bool);
-static inline bool atime_needs_update_rcu(const struct path *path,
- struct inode *inode)
-{
- return __atime_needs_update(path, inode, true);
-}
-
/*
* fs-writeback.c
*/
diff --git a/fs/namei.c b/fs/namei.c
index 186bd2464fd5..54ab8ccb8d6d 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1013,7 +1013,7 @@ const char *get_link(struct nameidata *nd)
if (!(nd->flags & LOOKUP_RCU)) {
touch_atime(&last->link);
cond_resched();
- } else if (atime_needs_update_rcu(&last->link, inode)) {
+ } else if (atime_needs_update(&last->link, inode)) {
if (unlikely(unlazy_walk(nd)))
return ERR_PTR(-ECHILD);
touch_atime(&last->link);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6961feda6915..96a4b9fd1f5f 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2066,6 +2066,7 @@ enum file_time_flags {
S_VERSION = 8,
};

+extern bool atime_needs_update(const struct path *, struct inode *);
extern void touch_atime(const struct path *);
static inline void file_accessed(struct file *file)
{
--
2.14.3
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