allow build_open_flags() to return an error

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/exec.c b/fs/exec.c
index 6430195..0f6c96c 100644 (file)
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -110,13 +110,14 @@ SYSCALL_DEFINE1(uselib, const char __user *, library)
        static const struct open_flags uselib_flags = {
                .open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,
                .acc_mode = MAY_READ | MAY_EXEC | MAY_OPEN,
-               .intent = LOOKUP_OPEN
+               .intent = LOOKUP_OPEN,
+               .lookup_flags = LOOKUP_FOLLOW,
        };
 
        if (IS_ERR(tmp))
                goto out;
 
-       file = do_filp_open(AT_FDCWD, tmp, &uselib_flags, LOOKUP_FOLLOW);
+       file = do_filp_open(AT_FDCWD, tmp, &uselib_flags);
        putname(tmp);
        error = PTR_ERR(file);
        if (IS_ERR(file))
@@ -756,10 +757,11 @@ struct file *open_exec(const char *name)
        static const struct open_flags open_exec_flags = {
                .open_flag = O_LARGEFILE | O_RDONLY | __FMODE_EXEC,
                .acc_mode = MAY_EXEC | MAY_OPEN,
-               .intent = LOOKUP_OPEN
+               .intent = LOOKUP_OPEN,
+               .lookup_flags = LOOKUP_FOLLOW,
        };
 
-       file = do_filp_open(AT_FDCWD, &tmp, &open_exec_flags, LOOKUP_FOLLOW);
+       file = do_filp_open(AT_FDCWD, &tmp, &open_exec_flags);
        if (IS_ERR(file))
                goto out;
 

diff --git a/fs/internal.h b/fs/internal.h
index 6812158..f6ad343 100644 (file)
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -96,11 +96,12 @@ struct open_flags {
        umode_t mode;
        int acc_mode;
        int intent;
+       int lookup_flags;
 };
 extern struct file *do_filp_open(int dfd, struct filename *pathname,
-               const struct open_flags *op, int flags);
+               const struct open_flags *op);
 extern struct file *do_file_open_root(struct dentry *, struct vfsmount *,
-               const char *, const struct open_flags *, int lookup_flags);
+               const char *, const struct open_flags *);
 
 extern long do_handle_open(int mountdirfd,
                           struct file_handle __user *ufh, int open_flag);

diff --git a/fs/namei.c b/fs/namei.c
index 1bc7b75..402eda3 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2969,9 +2969,10 @@ out:
 }
 
 struct file *do_filp_open(int dfd, struct filename *pathname,
-               const struct open_flags *op, int flags)
+               const struct open_flags *op)
 {
        struct nameidata nd;
+       int flags = op->lookup_flags;
        struct file *filp;
 
        filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_RCU);
@@ -2983,17 +2984,16 @@ struct file *do_filp_open(int dfd, struct filename *pathname,
 }
 
 struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
-               const char *name, const struct open_flags *op, int flags)
+               const char *name, const struct open_flags *op)
 {
        struct nameidata nd;
        struct file *file;
        struct filename filename = { .name = name };
+       int flags = op->lookup_flags | LOOKUP_ROOT;
 
        nd.root.mnt = mnt;
        nd.root.dentry = dentry;
 
-       flags |= LOOKUP_ROOT;
-
        if (dentry->d_inode->i_op->follow_link && op->intent & LOOKUP_OPEN)
                return ERR_PTR(-ELOOP);
 

diff --git a/fs/open.c b/fs/open.c
index 8c74100..5a40a4a 100644 (file)
--- a/fs/open.c
+++ b/fs/open.c
@@ -876,7 +876,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
                lookup_flags |= LOOKUP_DIRECTORY;
        if (!(flags & O_NOFOLLOW))
                lookup_flags |= LOOKUP_FOLLOW;
-       return lookup_flags;
+       op->lookup_flags = lookup_flags;
+       return 0;
 }
 
 /**
@@ -893,8 +894,8 @@ static inline int build_open_flags(int flags, umode_t mode, struct open_flags *o
 struct file *file_open_name(struct filename *name, int flags, umode_t mode)
 {
        struct open_flags op;
-       int lookup = build_open_flags(flags, mode, &op);
-       return do_filp_open(AT_FDCWD, name, &op, lookup);
+       int err = build_open_flags(flags, mode, &op);
+       return err ? ERR_PTR(err) : do_filp_open(AT_FDCWD, name, &op);
 }
 
 /**
@@ -919,37 +920,43 @@ struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
                            const char *filename, int flags)
 {
        struct open_flags op;
-       int lookup = build_open_flags(flags, 0, &op);
+       int err = build_open_flags(flags, 0, &op);
+       if (err)
+               return ERR_PTR(err);
        if (flags & O_CREAT)
                return ERR_PTR(-EINVAL);
        if (!filename && (flags & O_DIRECTORY))
                if (!dentry->d_inode->i_op->lookup)
                        return ERR_PTR(-ENOTDIR);
-       return do_file_open_root(dentry, mnt, filename, &op, lookup);
+       return do_file_open_root(dentry, mnt, filename, &op);
 }
 EXPORT_SYMBOL(file_open_root);
 
 long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)
 {
        struct open_flags op;
-       int lookup = build_open_flags(flags, mode, &op);
-       struct filename *tmp = getname(filename);
-       int fd = PTR_ERR(tmp);
-
-       if (!IS_ERR(tmp)) {
-               fd = get_unused_fd_flags(flags);
-               if (fd >= 0) {
-                       struct file *f = do_filp_open(dfd, tmp, &op, lookup);
-                       if (IS_ERR(f)) {
-                               put_unused_fd(fd);
-                               fd = PTR_ERR(f);
-                       } else {
-                               fsnotify_open(f);
-                               fd_install(fd, f);
-                       }
+       int fd = build_open_flags(flags, mode, &op);
+       struct filename *tmp;
+
+       if (fd)
+               return fd;
+
+       tmp = getname(filename);
+       if (IS_ERR(tmp))
+               return PTR_ERR(tmp);
+
+       fd = get_unused_fd_flags(flags);
+       if (fd >= 0) {
+               struct file *f = do_filp_open(dfd, tmp, &op);
+               if (IS_ERR(f)) {
+                       put_unused_fd(fd);
+                       fd = PTR_ERR(f);
+               } else {
+                       fsnotify_open(f);
+                       fd_install(fd, f);
                }
-               putname(tmp);
        }
+       putname(tmp);
        return fd;
 }