[PATCH 19/23] elevate write count for do_utimes()

Dave Hansen
2007-07-12T00:27:01Z

lxc-dave/fs/utimes.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff -puN fs/utimes.c~elevate-write-count-for-do-utimes fs/utimes.c
--- lxc/fs/utimes.c~elevate-write-count-for-do-utimes 2007-07-10 12:46:14.000000000 -0700
+++ lxc-dave/fs/utimes.c 2007-07-10 12:46:14.000000000 -0700
@@ -2,6 +2,7 @@
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/linkage.h>
+#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/sched.h>
#include <linux/stat.h>
@@ -75,8 +76,8 @@ long do_utimes(int dfd, char __user *fil

inode = dentry->d_inode;

- error = -EROFS;
- if (IS_RDONLY(inode))
+ error = mnt_want_write(nd.mnt);
+ if (error)
goto dput_and_out;

/* Don't worry, the checks are done in inode_change_ok() */
@@ -84,7 +85,7 @@ long do_utimes(int dfd, char __user *fil
if (times) {
error = -EPERM;
if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

if (times[0].tv_nsec == UTIME_OMIT)
newattrs.ia_valid &= ~ATTR_ATIME;
@@ -104,22 +105,24 @@ long do_utimes(int dfd, char __user *fil
} else {
error = -EACCES;
if (IS_IMMUTABLE(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

if (current->fsuid != inode->i_uid) {
if (f) {
if (!(f->f_mode & FMODE_WRITE))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
} else {
error = vfs_permission(&nd, MAY_WRITE);
if (error)
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
}
}
}
mutex_lock(&inode->i_mutex);
error = notify_change(dentry, &newattrs);
mutex_unlock(&inode->i_mutex);
+mnt_drop_write_and_out:
+ mnt_drop_write(nd.mnt);
dput_and_out:
if (f)
fput(f);
_