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Subject[patch-2.4.0-test12-pre6] truncate(2) permissions
Hi ALexander,

This patch combines your previous patch with 2 changes I have just
suggested. Both changes are obvious (and correct).

(correction to my previous message -- the immutable thing to return EPERM
is not just a good idea, it is imperative and Linux already does that --
so we can drop that check from if() unconditionally, which is what the
patch below does).

Tested under 2.4.0-test12-pre6.

Regards,
Tigran

--- linux/fs/open.c Thu Oct 26 16:11:21 2000
+++ work/fs/open.c Wed Dec 6 08:05:43 2000
@@ -102,7 +102,12 @@
goto out;
inode = nd.dentry->d_inode;

- error = -EACCES;
+ /* For directories it's -EISDIR, for other non-regulars - -EINVAL */
+ error = -EISDIR;
+ if (S_ISDIR(inode->i_mode))
+ goto dput_and_out;
+
+ error = -EINVAL;
if (!S_ISREG(inode->i_mode))
goto dput_and_out;

@@ -110,12 +115,8 @@
if (error)
goto dput_and_out;

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

/*
@@ -163,7 +164,7 @@
goto out;
dentry = file->f_dentry;
inode = dentry->d_inode;
- error = -EACCES;
+ error = -EINVAL;
if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE))
goto out_putf;
error = -EPERM;
-
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