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[patch 3/4] fat: dont call notify_change 

The FAT_IOCTL_SET_ATTRIBUTES ioctl() calls notify_change() to change
the file mode before changing the inode attributes.  Replace with
explicit calls to security_inode_setattr(), fat_setattr() and
fsnotify_change().

This is equivalent to the original.  The reason it is needed, is that
later in the series we move the immutable check into notify_change().
That would break the FAT_IOCTL_SET_ATTRIBUTES ioctl, as it needs to
perform the mode change regardless of the immutability of the file.

[Fix error if fat is built as a module.  Thanks to OGAWA Hirofumi for
noticing.]

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Miklos Szeredi 2008-07-01 15:01:28 +02:00 committed by Al Viro
parent e9b76fedc6
commit b1da47e29e
2 changed files with 16 additions and 2 deletions
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17
fs/fat/file.c
View File

@ -15,6 +15,8 @@
#include <linux/writeback.h>
#include <linux/backing-dev.h>
#include <linux/blkdev.h>
#include <linux/fsnotify.h>
#include <linux/security.h>
int fat_generic_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg)
@ -64,6 +66,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
/* Equivalent to a chmod() */
ia.ia_valid = ATTR_MODE | ATTR_CTIME;
ia.ia_ctime = current_fs_time(inode->i_sb);
if (is_dir) {
ia.ia_mode = MSDOS_MKMODE(attr,
S_IRWXUGO & ~sbi->options.fs_dmask)
@ -90,11 +93,21 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
}
}
/* This MUST be done before doing anything irreversible... */
err = notify_change(filp->f_path.dentry, &ia);
/*
* The security check is questionable... We single
* out the RO attribute for checking by the security
* module, just because it maps to a file mode.
*/
err = security_inode_setattr(filp->f_path.dentry, &ia);
if (err)
goto up;
/* This MUST be done before doing anything irreversible... */
err = fat_setattr(filp->f_path.dentry, &ia);
if (err)
goto up;
fsnotify_change(filp->f_path.dentry, ia.ia_valid);
if (sbi->options.sys_immutable) {
if (attr & ATTR_SYS)
inode->i_flags |= S_IMMUTABLE;

1
security/security.c
View File

@ -442,6 +442,7 @@ int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
return 0;
return security_ops->inode_setattr(dentry, attr);
}
EXPORT_SYMBOL_GPL(security_inode_setattr);
int security_inode_getattr(struct vfsmount *mnt, struct dentry *dentry)
{