[PATCH 3.2 078/106] excessive checks in ufs_write_failed() and ufs_evict_inode()

[Ben Hutchings]

3.2.93-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Al Viro <v...@zeniv.linux.org.uk>

commit babef37dccbaa49249a22bae9150686815d7be71 upstream.

As it is, short copy in write() to append-only file will fail
to truncate the excessive allocated blocks.  As the matter of
fact, all checks in ufs_truncate_blocks() are either redundant
or wrong for that caller.  As for the only other caller
(ufs_evict_inode()), we only need the file type checks there.

Signed-off-by: Al Viro <v...@zeniv.linux.org.uk>
[bwh: Backported to 3.2:
 - No functions need to be renamed
 - Adjust filenames, context]
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
--- a/fs/ufs/inode.c
+++ b/fs/ufs/inode.c
@@ -890,7 +890,10 @@ void ufs_evict_inode(struct inode * inod
                ufs_update_inode(inode, IS_SYNC(inode));
                old_i_size = inode->i_size;
                inode->i_size = 0;
-               if (inode->i_blocks && ufs_truncate(inode, old_i_size))
+               if (inode->i_blocks &&
+                   (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
+                    S_ISLNK(inode->i_mode)) &&
+                   ufs_truncate(inode, old_i_size))
                        ufs_warning(inode->i_sb, __func__, "ufs_truncate 
failed\n");
                unlock_ufs(inode->i_sb);
        }
--- a/fs/ufs/truncate.c
+++ b/fs/ufs/truncate.c
@@ -451,12 +451,6 @@ int ufs_truncate(struct inode *inode, lo
             inode->i_ino, (unsigned long long)i_size_read(inode),
             (unsigned long long)old_i_size);
 
-       if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
-             S_ISLNK(inode->i_mode)))
-               return -EINVAL;
-       if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
-               return -EPERM;
-
        err = ufs_alloc_lastblock(inode);
 
        if (err) {