ext4: don't calculate total xattr header size unless needed

The function ext4_expand_extra_isize_ea() doesn't need the size of all
of the extended attribute headers.  So if we don't calculate it when
it is unneeded, it we can skip some undeeded memory references, and as
a bonus, we eliminate some kvetching by static code analysis tools.

Addresses-Coverity-Id: #741291

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index e175e94..185066f 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -567,12 +567,13 @@ static size_t ext4_xattr_free_space(struct ext4_xattr_entry *last,
                                    size_t *min_offs, void *base, int *total)
 {
        for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
-               *total += EXT4_XATTR_LEN(last->e_name_len);
                if (!last->e_value_block && last->e_value_size) {
                        size_t offs = le16_to_cpu(last->e_value_offs);
                        if (offs < *min_offs)
                                *min_offs = offs;
                }
+               if (total)
+                       *total += EXT4_XATTR_LEN(last->e_name_len);
        }
        return (*min_offs - ((void *)last - base) - sizeof(__u32));
 }
@@ -1228,7 +1229,7 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
        struct ext4_xattr_block_find *bs = NULL;
        char *buffer = NULL, *b_entry_name = NULL;
        size_t min_offs, free;
-       int total_ino, total_blk;
+       int total_ino;
        void *base, *start, *end;
        int extra_isize = 0, error = 0, tried_min_extra_isize = 0;
        int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize);
@@ -1286,8 +1287,7 @@ retry:
                first = BFIRST(bh);
                end = bh->b_data + bh->b_size;
                min_offs = end - base;
-               free = ext4_xattr_free_space(first, &min_offs, base,
-                                            &total_blk);
+               free = ext4_xattr_free_space(first, &min_offs, base, NULL);
                if (free < new_extra_isize) {
                        if (!tried_min_extra_isize && s_min_extra_isize) {
                                tried_min_extra_isize++;