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authorChristoph Hellwig <hch@lst.de>2005-11-08 21:35:04 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-09 07:55:59 -0800
commit8c744fb83da0771afa04695028e3550b798dad90 (patch)
tree670896a1c2594965099853a6c992907abb3a886f /fs/namei.c
parente4543eddfd3bf3e0d625841377fa695a519edfd4 (diff)
downloadlinux-8c744fb83da0771afa04695028e3550b798dad90.tar.bz2
[PATCH] add a file_permission helper
A few more callers of permission() just want to check for a different access pattern on an already open file. This patch adds a wrapper for permission() that takes a file in preparation of per-mount read-only support and to clean up the callers a little. The helper is not intended for new code, everything without the interface set in stone should use vfs_permission() Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 25e4ab4ce8b7..b69f6ebadb95 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -271,6 +271,23 @@ int vfs_permission(struct nameidata *nd, int mask)
return permission(nd->dentry->d_inode, mask, nd);
}
+/**
+ * file_permission - check for additional access rights to a given file
+ * @file: file to check access rights for
+ * @mask: right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC)
+ *
+ * Used to check for read/write/execute permissions on an already opened
+ * file.
+ *
+ * Note:
+ * Do not use this function in new code. All access checks should
+ * be done using vfs_permission().
+ */
+int file_permission(struct file *file, int mask)
+{
+ return permission(file->f_dentry->d_inode, mask, NULL);
+}
+
/*
* get_write_access() gets write permission for a file.
* put_write_access() releases this write permission.
@@ -2551,6 +2568,7 @@ EXPORT_SYMBOL(path_release);
EXPORT_SYMBOL(path_walk);
EXPORT_SYMBOL(permission);
EXPORT_SYMBOL(vfs_permission);
+EXPORT_SYMBOL(file_permission);
EXPORT_SYMBOL(unlock_rename);
EXPORT_SYMBOL(vfs_create);
EXPORT_SYMBOL(vfs_follow_link);