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Subject[PATCH 11/34] vfs: split __dentry_open()
Date
From: Miklos Szeredi <mszeredi@suse.cz>

Split __dentry_open() into two functions:

do_dentry_open() - does most of the actual work, doesn't put file on failure
open_check_o_direct() - after a successful open, checks direct_IO method

This will allow i_op->atomic_open to do just the file initialization and leave
the direct_IO checking to the VFS.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
fs/internal.h | 1 +
fs/open.c | 47 +++++++++++++++++++++++++++++++++--------------
2 files changed, 34 insertions(+), 14 deletions(-)
diff --git a/fs/internal.h b/fs/internal.h
index 9962c59..4d69fdd 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -100,6 +100,7 @@ extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,

extern long do_handle_open(int mountdirfd,
struct file_handle __user *ufh, int open_flag);
+extern int open_check_o_direct(struct file *f);

/*
* inode.c
diff --git a/fs/open.c b/fs/open.c
index 5720854..971b474 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -644,10 +644,23 @@ static inline int __get_file_write_access(struct inode *inode,
return error;
}

-static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
- struct file *f,
- int (*open)(struct inode *, struct file *),
- const struct cred *cred)
+int open_check_o_direct(struct file *f)
+{
+ /* NB: we're sure to have correct a_ops only after f_op->open */
+ if (f->f_flags & O_DIRECT) {
+ if (!f->f_mapping->a_ops ||
+ ((!f->f_mapping->a_ops->direct_IO) &&
+ (!f->f_mapping->a_ops->get_xip_mem))) {
+ return -EINVAL;
+ }
+ }
+ return 0;
+}
+
+static struct file *do_dentry_open(struct dentry *dentry, struct vfsmount *mnt,
+ struct file *f,
+ int (*open)(struct inode *, struct file *),
+ const struct cred *cred)
{
static const struct file_operations empty_fops = {};
struct inode *inode;
@@ -703,16 +716,6 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,

file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);

- /* NB: we're sure to have correct a_ops only after f_op->open */
- if (f->f_flags & O_DIRECT) {
- if (!f->f_mapping->a_ops ||
- ((!f->f_mapping->a_ops->direct_IO) &&
- (!f->f_mapping->a_ops->get_xip_mem))) {
- fput(f);
- f = ERR_PTR(-EINVAL);
- }
- }
-
return f;

cleanup_all:
@@ -740,6 +743,22 @@ cleanup_file:
return ERR_PTR(error);
}

+static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
+ struct file *f,
+ int (*open)(struct inode *, struct file *),
+ const struct cred *cred)
+{
+ struct file *res = do_dentry_open(dentry, mnt, f, open, cred);
+ if (!IS_ERR(res)) {
+ int error = open_check_o_direct(f);
+ if (error) {
+ fput(res);
+ res = ERR_PTR(error);
+ }
+ }
+ return res;
+}
+
/**
* lookup_instantiate_filp - instantiates the open intent filp
* @nd: pointer to nameidata
--
1.7.7


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