[PATCH] reiserfs: reiserfs: check for files > 2GB on 3.5.x disks

When a filesystem has been converted from 3.5.x to 3.6.x, we need an extra
check during file write to make sure we are not trying to make a 3.5.x file
> 2GB.

Signed-off-by: Chris Mason <mason@suse.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 1cad5d066a5c..f3473176c83a 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -1287,6 +1287,23 @@ static ssize_t reiserfs_file_write(struct file *file,	/* the file we are going t
         struct reiserfs_transaction_handle th;
         th.t_trans_id = 0;
 
+        /* If a filesystem is converted from 3.5 to 3.6, we'll have v3.5 items
+        * lying around (most of the disk, in fact). Despite the filesystem
+        * now being a v3.6 format, the old items still can't support large
+        * file sizes. Catch this case here, as the rest of the VFS layer is
+        * oblivious to the different limitations between old and new items.
+        * reiserfs_setattr catches this for truncates. This chunk is lifted
+        * from generic_write_checks. */
+        if (get_inode_item_key_version (inode) == KEY_FORMAT_3_5 &&
+            *ppos + count > MAX_NON_LFS) {
+                if (*ppos >= MAX_NON_LFS) {
+                        send_sig(SIGXFSZ, current, 0);
+                        return -EFBIG;
+                }
+                if (count > MAX_NON_LFS - (unsigned long)*ppos)
+                        count = MAX_NON_LFS - (unsigned long)*ppos;
+        }
+
         if (file->f_flags & O_DIRECT) { // Direct IO needs treatment
                 ssize_t result, after_file_end = 0;
                 if ((*ppos + count >= inode->i_size)