[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>

diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 1cad5d066a5c343705616c692fa2a9913588da38..f3473176c83a4dad8a137225923f375414e5b404 100644 (file)
--- 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)