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Sanitize f_flags helpers 

* pull ACC_MODE to fs.h; we have several copies all over the place
* nightmarish expression calculating f_mode by f_flags deserves a helper
too (OPEN_FMODE(flags))

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-12-19 10:15:07 -05:00
parent 482928d59d
commit 5300990c03
6 changed files with 5 additions and 14 deletions
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10
fs/anon_inodes.c
View File

@ -89,19 +89,11 @@ struct file *anon_inode_getfile(const char *name,
struct qstr this;
struct path path;
struct file *file;
fmode_t mode;
int error;
if (IS_ERR(anon_inode_inode))
return ERR_PTR(-ENODEV);
switch (flags & O_ACCMODE) {
case O_RDONLY: mode = FMODE_READ; break;
case O_WRONLY: mode = FMODE_WRITE; break;
case O_RDWR: mode = FMODE_READ | FMODE_WRITE; break;
default: return ERR_PTR(-EINVAL);
}
if (fops->owner && !try_module_get(fops->owner))
return ERR_PTR(-ENOENT);
@ -129,7 +121,7 @@ struct file *anon_inode_getfile(const char *name,
d_instantiate(path.dentry, anon_inode_inode);
error = -ENFILE;
file = alloc_file(&path, mode, fops);
file = alloc_file(&path, OPEN_FMODE(flags), fops);
if (!file)
goto err_dput;
file->f_mapping = anon_inode_inode->i_mapping;

2
fs/namei.c
View File

@ -37,8 +37,6 @@
#include "internal.h"
#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
/* [Feb-1997 T. Schoebel-Theuer]
* Fundamental changes in the pathname lookup mechanisms (namei)
* were necessary because of omirr. The reason is that omirr needs

2
fs/open.c
View File

@ -828,7 +828,7 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
struct inode *inode;
int error;
f->f_mode = (__force fmode_t)((f->f_flags+1) & O_ACCMODE) | FMODE_LSEEK |
f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
FMODE_PREAD | FMODE_PWRITE;
inode = dentry->d_inode;
if (f->f_mode & FMODE_WRITE) {

3
include/linux/fs.h
View File

@ -2464,5 +2464,8 @@ int proc_nr_files(struct ctl_table *table, int write,
int __init get_filesystem_list(char *buf);
#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
#define OPEN_FMODE(flag) ((__force fmode_t)((flag + 1) & O_ACCMODE))
#endif /* __KERNEL__ */
#endif /* _LINUX_FS_H */

1
kernel/auditsc.c
View File

@ -250,7 +250,6 @@ struct audit_context {
#endif
};
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
static inline int open_arg(int flags, int mask)
{
int n = ACC_MODE(flags);

1
security/tomoyo/file.c
View File

@ -12,7 +12,6 @@
#include "common.h"
#include "tomoyo.h"
#include "realpath.h"
#define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE])
/*
* tomoyo_globally_readable_file_entry is a structure which is used for holding