diff options
| author | Christoph Hellwig <hch@lst.de> | 2009-01-05 19:27:23 +0100 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2009-03-27 14:43:57 -0400 |
| commit | c8fe8f30c7fe6ce6fc44a1db7d5bfa5144cd9211 (patch) | |
| tree | 4432fe47893442907d1e60ab362208dd9ae12bd2 | |
| parent | b6520c81934848cef126d93951f7ce242e0f656d (diff) | |
| download | lwn-c8fe8f30c7fe6ce6fc44a1db7d5bfa5144cd9211.tar.gz lwn-c8fe8f30c7fe6ce6fc44a1db7d5bfa5144cd9211.zip | |
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 <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/namei.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/fs/namei.c b/fs/namei.c index bbc15c237558..2a40409e3e03 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); |