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Subject[PATCH 1/3] vfs: add flags to d_real()
Date
Add a separate flags argument (in addition to the open flags) to control
the behavior of d_real().

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
Documentation/filesystems/Locking | 2 +-
Documentation/filesystems/vfs.txt | 2 +-
fs/open.c | 4 ++--
fs/overlayfs/super.c | 4 ++--
include/linux/dcache.h | 11 ++++++-----
include/linux/fs.h | 2 +-
6 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index fe25787ff6d4..75d2d57e2c44 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -22,7 +22,7 @@ prototypes:
struct vfsmount *(*d_automount)(struct path *path);
int (*d_manage)(const struct path *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *,
- unsigned int);
+ unsigned int, unsigned int);

locking rules:
rename_lock ->d_lock may block rcu-walk
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index 73e7d91f03dc..7f20c1bdfb67 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -990,7 +990,7 @@ struct dentry_operations {
struct vfsmount *(*d_automount)(struct path *);
int (*d_manage)(const struct path *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *,
- unsigned int);
+ unsigned int, unsigned int);
};

d_revalidate: called when the VFS needs to revalidate a dentry. This
diff --git a/fs/open.c b/fs/open.c
index 35bb784763a4..6d5c9a9b8c8d 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -96,7 +96,7 @@ long vfs_truncate(const struct path *path, loff_t length)
* write access on the upper inode, not on the overlay inode. For
* non-overlay filesystems d_real() is an identity function.
*/
- upperdentry = d_real(path->dentry, NULL, O_WRONLY);
+ upperdentry = d_real(path->dentry, NULL, O_WRONLY, 0);
error = PTR_ERR(upperdentry);
if (IS_ERR(upperdentry))
goto mnt_drop_write_and_out;
@@ -857,7 +857,7 @@ EXPORT_SYMBOL(file_path);
int vfs_open(const struct path *path, struct file *file,
const struct cred *cred)
{
- struct dentry *dentry = d_real(path->dentry, NULL, file->f_flags);
+ struct dentry *dentry = d_real(path->dentry, NULL, file->f_flags, 0);

if (IS_ERR(dentry))
return PTR_ERR(dentry);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index c0c02cca776b..19e89ce39017 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -70,7 +70,7 @@ static int ovl_check_append_only(struct inode *inode, int flag)

static struct dentry *ovl_d_real(struct dentry *dentry,
const struct inode *inode,
- unsigned int open_flags)
+ unsigned int open_flags, unsigned int flags)
{
struct dentry *real;
int err;
@@ -102,7 +102,7 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
goto bug;

/* Handle recursion */
- real = d_real(real, inode, open_flags);
+ real = d_real(real, inode, open_flags, 0);

if (!inode || inode == d_inode(real))
return real;
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index aae1cdb76851..fd0721e520f4 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -147,7 +147,7 @@ struct dentry_operations {
struct vfsmount *(*d_automount)(struct path *);
int (*d_manage)(const struct path *, bool);
struct dentry *(*d_real)(struct dentry *, const struct inode *,
- unsigned int);
+ unsigned int, unsigned int);
} ____cacheline_aligned;

/*
@@ -566,7 +566,8 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper)
* d_real - Return the real dentry
* @dentry: the dentry to query
* @inode: inode to select the dentry from multiple layers (can be NULL)
- * @flags: open flags to control copy-up behavior
+ * @open_flags: open flags to control copy-up behavior
+ * @flags: flags to control what is returned by this function
*
* If dentry is on a union/overlay, then return the underlying, real dentry.
* Otherwise return the dentry itself.
@@ -575,10 +576,10 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper)
*/
static inline struct dentry *d_real(struct dentry *dentry,
const struct inode *inode,
- unsigned int flags)
+ unsigned int open_flags, unsigned int flags)
{
if (unlikely(dentry->d_flags & DCACHE_OP_REAL))
- return dentry->d_op->d_real(dentry, inode, flags);
+ return dentry->d_op->d_real(dentry, inode, open_flags, flags);
else
return dentry;
}
@@ -593,7 +594,7 @@ static inline struct dentry *d_real(struct dentry *dentry,
static inline struct inode *d_real_inode(const struct dentry *dentry)
{
/* This usage of d_real() results in const dentry */
- return d_backing_inode(d_real((struct dentry *) dentry, NULL, 0));
+ return d_backing_inode(d_real((struct dentry *) dentry, NULL, 0, 0));
}

struct name_snapshot {
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 6e1fd5d21248..ee1db83c39cb 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1233,7 +1233,7 @@ static inline struct inode *file_inode(const struct file *f)

static inline struct dentry *file_dentry(const struct file *file)
{
- return d_real(file->f_path.dentry, file_inode(file), 0);
+ return d_real(file->f_path.dentry, file_inode(file), 0, 0);
}

static inline int locks_lock_file_wait(struct file *filp, struct file_lock *fl)
--
2.5.5
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