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authorMiklos Szeredi <mszeredi@suse.cz>2014-10-24 00:14:35 +0200
committerAlex Shi <alex.shi@linaro.org>2015-04-17 15:50:59 +0800
commit71732036259eac84c4b4add5b7503a0f01905bc4 (patch)
tree63aa2a8034d2ace8c8b0a40fb06b882deb3ffa24 /fs/open.c
parent6c1a7bfb6a5ac8cf057fd191acd8f28b23c60dd4 (diff)
downloadlinux-linaro-stable-71732036259eac84c4b4add5b7503a0f01905bc4.tar.gz
vfs: add i_op->dentry_open()
Add a new inode operation i_op->dentry_open(). This is for stacked filesystems that want to return a struct file from a different filesystem. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> (cherry picked from commit 4aa7c6346be395bdf776f82bbb2e3e2bc60bdd2b) Signed-off-by: Alex Shi <alex.shi@linaro.org>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/fs/open.c b/fs/open.c
index 2ed7325f713e..c92c6ef8bf6d 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -822,8 +822,7 @@ struct file *dentry_open(const struct path *path, int flags,
f = get_empty_filp();
if (!IS_ERR(f)) {
f->f_flags = flags;
- f->f_path = *path;
- error = do_dentry_open(f, NULL, cred);
+ error = vfs_open(path, f, cred);
if (!error) {
/* from now on we need fput() to dispose of f */
error = open_check_o_direct(f);
@@ -840,6 +839,26 @@ struct file *dentry_open(const struct path *path, int flags,
}
EXPORT_SYMBOL(dentry_open);
+/**
+ * vfs_open - open the file at the given path
+ * @path: path to open
+ * @filp: newly allocated file with f_flag initialized
+ * @cred: credentials to use
+ */
+int vfs_open(const struct path *path, struct file *filp,
+ const struct cred *cred)
+{
+ struct inode *inode = path->dentry->d_inode;
+
+ if (inode->i_op->dentry_open)
+ return inode->i_op->dentry_open(path->dentry, filp, cred);
+ else {
+ filp->f_path = *path;
+ return do_dentry_open(filp, NULL, cred);
+ }
+}
+EXPORT_SYMBOL(vfs_open);
+
static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op)
{
int lookup_flags = 0;