[PATCH 21/28] elevate writer count for do_sys_truncate()

Dave Hansen
2006-08-01T23:56:51Z

lxc-dave/fs/open.c | 16 +++++++++++-----
1 files changed, 11 insertions(+), 5 deletions(-)

diff -puN fs/open.c~C-elevate-writers-opens-part2-do_sys_truncate fs/open.c
--- lxc/fs/open.c~C-elevate-writers-opens-part2-do_sys_truncate 2006-08-01 16:35:22.000000000 -0700
+++ lxc-dave/fs/open.c 2006-08-01 16:35:29.000000000 -0700
@@ -244,28 +244,32 @@ static long do_sys_truncate(const char _
if (!S_ISREG(inode->i_mode))
goto dput_and_out;

- error = vfs_permission(&nd, MAY_WRITE);
+ error = mnt_want_write(nd.mnt);
if (error)
goto dput_and_out;

+ error = vfs_permission(&nd, MAY_WRITE);
+ if (error)
+ goto mnt_drop_write_and_out;
+
error = -EROFS;
if (IS_RDONLY(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

error = -EPERM;
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

/*
* Make sure that there are no leases.
*/
error = break_lease(inode, FMODE_WRITE);
if (error)
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

error = get_write_access(inode);
if (error)
- goto dput_and_out;
+ goto mnt_drop_write_and_out;

error = locks_verify_truncate(inode, NULL, length);
if (!error) {
@@ -274,6 +278,8 @@ static long do_sys_truncate(const char _
}
put_write_access(inode);

+mnt_drop_write_and_out:
+ mnt_drop_write(nd.mnt);
dput_and_out:
path_release(&nd);
out:
_