ext4: remove (almost) unused variables from ext4_expand_extra_isize_ea()

'start' variable is completely unused in ext4_expand_extra_isize_ea().
Variable 'first' is used only once in one place. So just remove them.
Variables 'entry' and 'last' are only really used later in the function
inside a loop. Move their declarations there.

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 8f582ae..2ef6876 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1425,12 +1425,11 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
                               struct ext4_inode *raw_inode, handle_t *handle)
 {
        struct ext4_xattr_ibody_header *header;
-       struct ext4_xattr_entry *entry, *last, *first;
        struct buffer_head *bh = NULL;
        size_t min_offs;
        size_t ifree, bfree;
        int total_ino;
-       void *base, *start, *end;
+       void *base, *end;
        int 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);
        int isize_diff; /* How much do we need to grow i_extra_isize */
@@ -1446,24 +1445,22 @@ retry:
                goto out;
 
        header = IHDR(inode, raw_inode);
-       entry = IFIRST(header);
 
        /*
         * Check if enough free space is available in the inode to shift the
         * entries ahead by new_extra_isize.
         */
 
-       base = start = entry;
+       base = IFIRST(header);
        end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
        min_offs = end - base;
-       last = entry;
        total_ino = sizeof(struct ext4_xattr_ibody_header);
 
        error = xattr_check_inode(inode, header, end);
        if (error)
                goto cleanup;
 
-       ifree = ext4_xattr_free_space(last, &min_offs, base, &total_ino);
+       ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino);
        if (ifree >= isize_diff)
                goto shift;
 
@@ -1483,10 +1480,10 @@ retry:
                        goto cleanup;
                }
                base = BHDR(bh);
-               first = BFIRST(bh);
                end = bh->b_data + bh->b_size;
                min_offs = end - base;
-               bfree = ext4_xattr_free_space(first, &min_offs, base, NULL);
+               bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base,
+                                             NULL);
                if (bfree + ifree < isize_diff) {
                        if (!tried_min_extra_isize && s_min_extra_isize) {
                                tried_min_extra_isize++;
@@ -1502,14 +1499,14 @@ retry:
        }
 
        while (isize_diff > ifree) {
-               struct ext4_xattr_entry *small_entry = NULL;
+               struct ext4_xattr_entry *small_entry = NULL, *entry = NULL;
+               struct ext4_xattr_entry *last;
                unsigned int entry_size;        /* EA entry size */
                unsigned int total_size;        /* EA entry size + value size */
                unsigned int min_total_size = ~0U;
 
                last = IFIRST(header);
                /* Find the entry best suited to be pushed into EA block */
-               entry = NULL;
                for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
                        total_size =
                        EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) +
@@ -1556,8 +1553,7 @@ retry:
 
 shift:
        /* Adjust the offsets and shift the remaining entries ahead */
-       entry = IFIRST(header);
-       ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize
+       ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize
                        - new_extra_isize, (void *)raw_inode +
                        EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize,
                        (void *)header, total_ino);