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authorDave Hansen <haveblue@us.ibm.com>2008-02-15 14:37:52 -0800
committerAl Viro <viro@zeniv.linux.org.uk>2008-04-19 00:29:25 -0400
commit9ac9b8474c39c3ae2c2b37d8e1f08db8a9146124 (patch)
treee630074f48b8edd7a54805e5fb9b2b15896d052f /fs/open.c
parent2af482a7edfb8810539cacc2fdd8242611ca43bb (diff)
[PATCH] r/o bind mounts: write counts for truncate()
Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/open.c')
-rw-r--r--fs/open.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/open.c b/fs/open.c
index e2df8fd1eb0..4d690e33446 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -244,21 +244,21 @@ static long do_sys_truncate(const char __user * path, loff_t length)
if (!S_ISREG(inode->i_mode))
goto dput_and_out;
- error = vfs_permission(&nd, MAY_WRITE);
+ error = mnt_want_write(nd.path.mnt);
if (error)
goto dput_and_out;
- error = -EROFS;
- if (IS_RDONLY(inode))
- goto dput_and_out;
+ error = vfs_permission(&nd, MAY_WRITE);
+ if (error)
+ 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;
error = get_write_access(inode);
if (error)
- goto dput_and_out;
+ goto mnt_drop_write_and_out;
/*
* Make sure that there are no leases. get_write_access() protects
@@ -276,6 +276,8 @@ static long do_sys_truncate(const char __user * path, loff_t length)
put_write_and_out:
put_write_access(inode);
+mnt_drop_write_and_out:
+ mnt_drop_write(nd.path.mnt);
dput_and_out:
path_put(&nd.path);
out: