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[PATCH] add a file_permission helper

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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>
This commit is contained in:
Christoph Hellwig
2005-11-08 21:35:04 -08:00
committed by Linus Torvalds
parent e4543eddfd
commit 8c744fb83d
8 changed files with 47 additions and 21 deletions
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18
fs/namei.c
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@@ -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);