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authorMiklos Szeredi <mszeredi@suse.cz>2012-05-21 17:30:15 +0200
committerAl Viro <viro@zeniv.linux.org.uk>2012-06-01 12:12:00 -0400
commit90ad1a8ecb9bfd5ff4503ac42cd049a97643ee51 (patch)
tree0e41482d5706e153045c0635c53bb2d9d8c3e704
parent5f5daac12a4cef568d1269be0215fec0667193c1 (diff)
vfs: split __dentry_open()
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> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/internal.h1
-rw-r--r--fs/open.c47
2 files changed, 34 insertions, 14 deletions
diff --git a/fs/internal.h b/fs/internal.h
index 8040af489c7..18bc216ea09 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 d54301219d0..9daa1cea52f 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -654,10 +654,23 @@ 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;
@@ -713,16 +726,6 @@ 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:
@@ -750,6 +753,22 @@ 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