From c8fe8f30c7fe6ce6fc44a1db7d5bfa5144cd9211 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 5 Jan 2009 19:27:23 +0100 Subject: [PATCH] cleanup may_open Add a switch for the various i_mode fmt cases, and remove the comment about writeability of devices nodes - that part is handled in inode_permission and comment on (briefly) there. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/namei.c | 26 ++++++++++++-------------- 1 file changed, 12 insertions(+), 14 deletions(-) diff --git a/fs/namei.c b/fs/namei.c index bbc15c23755..2a40409e3e0 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1486,24 +1486,22 @@ int may_open(struct path *path, int acc_mode, int flag) if (!inode) return -ENOENT; - if (S_ISLNK(inode->i_mode)) + switch (inode->i_mode & S_IFMT) { + case S_IFLNK: return -ELOOP; - - if (S_ISDIR(inode->i_mode) && (acc_mode & MAY_WRITE)) - return -EISDIR; - - /* - * FIFO's, sockets and device files are special: they don't - * actually live on the filesystem itself, and as such you - * can write to them even if the filesystem is read-only. - */ - if (S_ISFIFO(inode->i_mode) || S_ISSOCK(inode->i_mode)) { - flag &= ~O_TRUNC; - } else if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { + case S_IFDIR: + if (acc_mode & MAY_WRITE) + return -EISDIR; + break; + case S_IFBLK: + case S_IFCHR: if (path->mnt->mnt_flags & MNT_NODEV) return -EACCES; - + /*FALLTHRU*/ + case S_IFIFO: + case S_IFSOCK: flag &= ~O_TRUNC; + break; } error = inode_permission(inode, acc_mode); -- 2.41.1