diff options
| -rw-r--r-- | fs/namei.c | 41 | ||||
| -rw-r--r-- | include/linux/fs.h | 4 |
2 files changed, 45 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c index 53b4bc094db2..81c388a813d3 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -3624,6 +3624,47 @@ out_err: } EXPORT_SYMBOL(vfs_tmpfile); +/** + * vfs_tmpfile_open - open a tmpfile for kernel internal use + * @mnt_userns: user namespace of the mount the inode was found from + * @parentpath: path of the base directory + * @mode: mode of the new tmpfile + * @open_flag: flags + * @cred: credentials for open + * + * Create and open a temporary file. The file is not accounted in nr_files, + * hence this is only for kernel internal use, and must not be installed into + * file tables or such. + */ +struct file *vfs_tmpfile_open(struct user_namespace *mnt_userns, + const struct path *parentpath, + umode_t mode, int open_flag, const struct cred *cred) +{ + struct file *file; + int error; + struct path path = { .mnt = parentpath->mnt }; + + path.dentry = vfs_tmpfile(mnt_userns, parentpath->dentry, mode, open_flag); + if (IS_ERR(path.dentry)) + return ERR_CAST(path.dentry); + + error = may_open(mnt_userns, &path, 0, open_flag); + file = ERR_PTR(error); + if (error) + goto out_dput; + + /* + * This relies on the "noaccount" property of fake open, otherwise + * equivalent to dentry_open(). + */ + file = open_with_fake_path(&path, open_flag, d_inode(path.dentry), cred); +out_dput: + dput(path.dentry); + + return file; +} +EXPORT_SYMBOL(vfs_tmpfile_open); + static int do_tmpfile(struct nameidata *nd, unsigned flags, const struct open_flags *op, struct file *file) diff --git a/include/linux/fs.h b/include/linux/fs.h index 9eced4cc286e..15fafda95dd3 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2007,6 +2007,10 @@ static inline int vfs_whiteout(struct user_namespace *mnt_userns, struct dentry *vfs_tmpfile(struct user_namespace *mnt_userns, struct dentry *dentry, umode_t mode, int open_flag); +struct file *vfs_tmpfile_open(struct user_namespace *mnt_userns, + const struct path *parentpath, + umode_t mode, int open_flag, const struct cred *cred); + int vfs_mkobj(struct dentry *, umode_t, int (*f)(struct dentry *, umode_t, void *), void *); |