ext4: replace bogus assertion in ext4_xattr_shift_entries()

We were checking whether computed offsets do not exceed end of block in
ext4_xattr_shift_entries(). However this does not make sense since we
always only decrease offsets. So replace that assertion with a check
whether we really decrease xattrs value offsets.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 1447860..82b025c 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1319,18 +1319,19 @@ retry:
  */
 static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry,
                                     int value_offs_shift, void *to,
-                                    void *from, size_t n, int blocksize)
+                                    void *from, size_t n)
 {
        struct ext4_xattr_entry *last = entry;
        int new_offs;
 
+       /* We always shift xattr headers further thus offsets get lower */
+       BUG_ON(value_offs_shift > 0);
+
        /* Adjust the value offsets of the entries */
        for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
                if (last->e_value_size) {
                        new_offs = le16_to_cpu(last->e_value_offs) +
                                                        value_offs_shift;
-                       BUG_ON(new_offs + le32_to_cpu(last->e_value_size)
-                                > blocksize);
                        last->e_value_offs = cpu_to_le16(new_offs);
                }
        }
@@ -1542,7 +1543,7 @@ shift:
        ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize
                        - new_extra_isize, (void *)raw_inode +
                        EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize,
-                       (void *)header, total_ino, inode->i_sb->s_blocksize);
+                       (void *)header, total_ino);
        EXT4_I(inode)->i_extra_isize = new_extra_isize;
        brelse(bh);
 out: