btrfs: remove all unused functions
Remove static and global declarations and/or definitions. Reduces size of btrfs.ko by ~3.4kB. text data bss dec hex filename 402081 7464 200 409745 64091 btrfs.ko.base 398620 7144 200 405964 631cc btrfs.ko.remove-all Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba
@@ -941,13 +941,6 @@ int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
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NULL, mask);
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}
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static int clear_extent_new(struct extent_io_tree *tree, u64 start, u64 end,
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gfp_t mask)
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{
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return clear_extent_bit(tree, start, end, EXTENT_NEW, 0, 0,
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NULL, mask);
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}
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int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end,
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struct extent_state **cached_state, gfp_t mask)
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{
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@@ -963,11 +956,6 @@ static int clear_extent_uptodate(struct extent_io_tree *tree, u64 start,
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cached_state, mask);
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}
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int wait_on_extent_writeback(struct extent_io_tree *tree, u64 start, u64 end)
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{
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return wait_extent_bit(tree, start, end, EXTENT_WRITEBACK);
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}
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/*
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* either insert or lock state struct between start and end use mask to tell
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* us if waiting is desired.
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@@ -1027,25 +1015,6 @@ int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask)
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mask);
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}
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/*
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* helper function to set pages and extents in the tree dirty
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*/
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int set_range_dirty(struct extent_io_tree *tree, u64 start, u64 end)
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{
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unsigned long index = start >> PAGE_CACHE_SHIFT;
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unsigned long end_index = end >> PAGE_CACHE_SHIFT;
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struct page *page;
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while (index <= end_index) {
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page = find_get_page(tree->mapping, index);
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BUG_ON(!page);
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__set_page_dirty_nobuffers(page);
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page_cache_release(page);
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index++;
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}
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return 0;
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}
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/*
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* helper function to set both pages and extents in the tree writeback
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*/
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@@ -1819,46 +1788,6 @@ static void end_bio_extent_readpage(struct bio *bio, int err)
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bio_put(bio);
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}
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/*
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* IO done from prepare_write is pretty simple, we just unlock
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* the structs in the extent tree when done, and set the uptodate bits
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* as appropriate.
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*/
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static void end_bio_extent_preparewrite(struct bio *bio, int err)
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{
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const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
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struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
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struct extent_io_tree *tree;
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u64 start;
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u64 end;
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do {
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struct page *page = bvec->bv_page;
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struct extent_state *cached = NULL;
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tree = &BTRFS_I(page->mapping->host)->io_tree;
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start = ((u64)page->index << PAGE_CACHE_SHIFT) +
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bvec->bv_offset;
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end = start + bvec->bv_len - 1;
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if (--bvec >= bio->bi_io_vec)
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prefetchw(&bvec->bv_page->flags);
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if (uptodate) {
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set_extent_uptodate(tree, start, end, &cached,
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GFP_ATOMIC);
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} else {
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ClearPageUptodate(page);
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SetPageError(page);
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}
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unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC);
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} while (bvec >= bio->bi_io_vec);
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bio_put(bio);
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}
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struct bio *
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btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs,
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gfp_t gfp_flags)
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@@ -2719,128 +2648,6 @@ int extent_invalidatepage(struct extent_io_tree *tree,
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return 0;
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}
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/*
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* simple commit_write call, set_range_dirty is used to mark both
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* the pages and the extent records as dirty
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*/
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int extent_commit_write(struct extent_io_tree *tree,
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struct inode *inode, struct page *page,
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unsigned from, unsigned to)
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{
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loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
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set_page_extent_mapped(page);
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set_page_dirty(page);
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if (pos > inode->i_size) {
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i_size_write(inode, pos);
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mark_inode_dirty(inode);
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}
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return 0;
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}
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int extent_prepare_write(struct extent_io_tree *tree,
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struct inode *inode, struct page *page,
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unsigned from, unsigned to, get_extent_t *get_extent)
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{
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u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT;
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u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
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u64 block_start;
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u64 orig_block_start;
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u64 block_end;
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u64 cur_end;
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struct extent_map *em;
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unsigned blocksize = 1 << inode->i_blkbits;
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size_t pg_offset = 0;
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size_t block_off_start;
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size_t block_off_end;
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int err = 0;
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int iocount = 0;
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int ret = 0;
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int isnew;
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set_page_extent_mapped(page);
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block_start = (page_start + from) & ~((u64)blocksize - 1);
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block_end = (page_start + to - 1) | (blocksize - 1);
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orig_block_start = block_start;
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lock_extent(tree, page_start, page_end, GFP_NOFS);
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while (block_start <= block_end) {
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em = get_extent(inode, page, pg_offset, block_start,
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block_end - block_start + 1, 1);
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if (IS_ERR_OR_NULL(em))
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goto err;
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cur_end = min(block_end, extent_map_end(em) - 1);
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block_off_start = block_start & (PAGE_CACHE_SIZE - 1);
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block_off_end = block_off_start + blocksize;
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isnew = clear_extent_new(tree, block_start, cur_end, GFP_NOFS);
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if (!PageUptodate(page) && isnew &&
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(block_off_end > to || block_off_start < from)) {
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void *kaddr;
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kaddr = kmap_atomic(page, KM_USER0);
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if (block_off_end > to)
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memset(kaddr + to, 0, block_off_end - to);
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if (block_off_start < from)
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memset(kaddr + block_off_start, 0,
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from - block_off_start);
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flush_dcache_page(page);
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kunmap_atomic(kaddr, KM_USER0);
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}
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if ((em->block_start != EXTENT_MAP_HOLE &&
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em->block_start != EXTENT_MAP_INLINE) &&
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!isnew && !PageUptodate(page) &&
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(block_off_end > to || block_off_start < from) &&
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!test_range_bit(tree, block_start, cur_end,
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EXTENT_UPTODATE, 1, NULL)) {
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u64 sector;
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u64 extent_offset = block_start - em->start;
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size_t iosize;
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sector = (em->block_start + extent_offset) >> 9;
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iosize = (cur_end - block_start + blocksize) &
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~((u64)blocksize - 1);
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/*
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* we've already got the extent locked, but we
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* need to split the state such that our end_bio
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* handler can clear the lock.
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*/
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set_extent_bit(tree, block_start,
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block_start + iosize - 1,
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EXTENT_LOCKED, 0, NULL, NULL, GFP_NOFS);
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ret = submit_extent_page(READ, tree, page,
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sector, iosize, pg_offset, em->bdev,
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NULL, 1,
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end_bio_extent_preparewrite, 0,
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0, 0);
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if (ret && !err)
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err = ret;
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iocount++;
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block_start = block_start + iosize;
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} else {
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struct extent_state *cached = NULL;
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set_extent_uptodate(tree, block_start, cur_end, &cached,
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GFP_NOFS);
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unlock_extent_cached(tree, block_start, cur_end,
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&cached, GFP_NOFS);
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block_start = cur_end + 1;
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}
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pg_offset = block_start & (PAGE_CACHE_SIZE - 1);
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free_extent_map(em);
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}
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if (iocount) {
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wait_extent_bit(tree, orig_block_start,
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block_end, EXTENT_LOCKED);
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}
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check_page_uptodate(tree, page);
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err:
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/* FIXME, zero out newly allocated blocks on error */
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return err;
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}
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/*
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* a helper for releasepage, this tests for areas of the page that
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* are locked or under IO and drops the related state bits if it is safe
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@@ -2927,33 +2734,6 @@ int try_release_extent_mapping(struct extent_map_tree *map,
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return try_release_extent_state(map, tree, page, mask);
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}
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sector_t extent_bmap(struct address_space *mapping, sector_t iblock,
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get_extent_t *get_extent)
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{
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struct inode *inode = mapping->host;
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struct extent_state *cached_state = NULL;
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u64 start = iblock << inode->i_blkbits;
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sector_t sector = 0;
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size_t blksize = (1 << inode->i_blkbits);
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struct extent_map *em;
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lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + blksize - 1,
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0, &cached_state, GFP_NOFS);
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em = get_extent(inode, NULL, 0, start, blksize, 0);
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unlock_extent_cached(&BTRFS_I(inode)->io_tree, start,
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start + blksize - 1, &cached_state, GFP_NOFS);
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if (IS_ERR_OR_NULL(em))
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return 0;
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if (em->block_start > EXTENT_MAP_LAST_BYTE)
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goto out;
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sector = (em->block_start + start - em->start) >> inode->i_blkbits;
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out:
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free_extent_map(em);
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return sector;
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}
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/*
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* helper function for fiemap, which doesn't want to see any holes.
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* This maps until we find something past 'last'
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@@ -3437,13 +3217,6 @@ int clear_extent_buffer_dirty(struct extent_io_tree *tree,
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return 0;
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}
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int wait_on_extent_buffer_writeback(struct extent_io_tree *tree,
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struct extent_buffer *eb)
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{
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return wait_on_extent_writeback(tree, eb->start,
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eb->start + eb->len - 1);
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}
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int set_extent_buffer_dirty(struct extent_io_tree *tree,
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struct extent_buffer *eb)
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{
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