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vfs: add flags to d_real()

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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>
This commit is contained in:
Miklos Szeredi 2017-09-04 21:42:22 +02:00
parent 191a3980c6
commit 495e642939
6 changed files with 13 additions and 12 deletions
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2
Documentation/filesystems/Locking
View File

@ -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

2
Documentation/filesystems/vfs.txt
View File

@ -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

4
fs/open.c
View File

@ -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);

4
fs/overlayfs/super.c
View File

@ -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;

11
include/linux/dcache.h
View File

@ -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 {

2
include/linux/fs.h
View File

@ -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)