Messages in this thread Patch in this message | | | Date | Fri, 15 Jun 2007 00:15:55 +0200 | From | Adrian Bunk <> | Subject | [-mm patch] remove nobh_{prepare,commit}_write() |
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nobh_{prepare,commit}_write() are no longer used.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
---
fs/buffer.c | 175 ------------------------------------ include/linux/buffer_head.h | 2 2 files changed, 177 deletions(-)
--- linux-2.6.22-rc4-mm2/include/linux/buffer_head.h.old 2007-06-14 01:54:54.000000000 +0200 +++ linux-2.6.22-rc4-mm2/include/linux/buffer_head.h 2007-06-14 01:55:08.000000000 +0200 @@ -224,8 +224,6 @@ int generic_commit_write(struct file *, struct page *, unsigned, unsigned); int block_truncate_page(struct address_space *, loff_t, get_block_t *); int file_fsync(struct file *, struct dentry *, int); -int nobh_prepare_write(struct page*, unsigned, unsigned, get_block_t*); -int nobh_commit_write(struct file *, struct page *, unsigned, unsigned); int nobh_truncate_page(struct address_space *, loff_t); int nobh_writepage(struct page *page, get_block_t *get_block, struct writeback_control *wbc); --- linux-2.6.22-rc4-mm2/fs/buffer.c.old 2007-06-14 01:55:22.000000000 +0200 +++ linux-2.6.22-rc4-mm2/fs/buffer.c 2007-06-14 01:56:12.000000000 +0200 @@ -2315,181 +2315,6 @@ /* - * nobh_prepare_write()'s prereads are special: the buffer_heads are freed - * immediately, while under the page lock. So it needs a special end_io - * handler which does not touch the bh after unlocking it. - * - * Note: unlock_buffer() sort-of does touch the bh after unlocking it, but - * a race there is benign: unlock_buffer() only use the bh's address for - * hashing after unlocking the buffer, so it doesn't actually touch the bh - * itself. - */ -static void end_buffer_read_nobh(struct buffer_head *bh, int uptodate) -{ - if (uptodate) { - set_buffer_uptodate(bh); - } else { - /* This happens, due to failed READA attempts. */ - clear_buffer_uptodate(bh); - } - unlock_buffer(bh); -} - -/* - * On entry, the page is fully not uptodate. - * On exit the page is fully uptodate in the areas outside (from,to) - */ -int nobh_prepare_write(struct page *page, unsigned from, unsigned to, - get_block_t *get_block) -{ - struct inode *inode = page->mapping->host; - const unsigned blkbits = inode->i_blkbits; - const unsigned blocksize = 1 << blkbits; - struct buffer_head map_bh; - struct buffer_head *read_bh[MAX_BUF_PER_PAGE]; - unsigned block_in_page; - unsigned block_start; - sector_t block_in_file; - char *kaddr; - int nr_reads = 0; - int i; - int ret = 0; - int is_mapped_to_disk = 1; - - if (PageMappedToDisk(page)) - return 0; - - block_in_file = (sector_t)page->index << (PAGE_CACHE_SHIFT - blkbits); - map_bh.b_page = page; - - /* - * We loop across all blocks in the page, whether or not they are - * part of the affected region. This is so we can discover if the - * page is fully mapped-to-disk. - */ - for (block_start = 0, block_in_page = 0; - block_start < PAGE_CACHE_SIZE; - block_in_page++, block_start += blocksize) { - unsigned block_end = block_start + blocksize; - int create; - - map_bh.b_state = 0; - create = 1; - if (block_start >= to) - create = 0; - map_bh.b_size = blocksize; - ret = get_block(inode, block_in_file + block_in_page, - &map_bh, create); - if (ret) - goto failed; - if (!buffer_mapped(&map_bh)) - is_mapped_to_disk = 0; - if (buffer_new(&map_bh)) - unmap_underlying_metadata(map_bh.b_bdev, - map_bh.b_blocknr); - if (PageUptodate(page)) - continue; - if (buffer_new(&map_bh) || !buffer_mapped(&map_bh)) { - kaddr = kmap_atomic(page, KM_USER0); - if (block_start < from) - memset(kaddr+block_start, 0, from-block_start); - if (block_end > to) - memset(kaddr + to, 0, block_end - to); - flush_dcache_page(page); - kunmap_atomic(kaddr, KM_USER0); - continue; - } - if (buffer_uptodate(&map_bh)) - continue; /* reiserfs does this */ - if (block_start < from || block_end > to) { - struct buffer_head *bh = alloc_buffer_head(GFP_NOFS); - - if (!bh) { - ret = -ENOMEM; - goto failed; - } - bh->b_state = map_bh.b_state; - atomic_set(&bh->b_count, 0); - bh->b_this_page = NULL; - bh->b_page = page; - bh->b_blocknr = map_bh.b_blocknr; - bh->b_size = blocksize; - bh->b_data = (char *)(long)block_start; - bh->b_bdev = map_bh.b_bdev; - bh->b_private = NULL; - read_bh[nr_reads++] = bh; - } - } - - if (nr_reads) { - struct buffer_head *bh; - - /* - * The page is locked, so these buffers are protected from - * any VM or truncate activity. Hence we don't need to care - * for the buffer_head refcounts. - */ - for (i = 0; i < nr_reads; i++) { - bh = read_bh[i]; - lock_buffer(bh); - bh->b_end_io = end_buffer_read_nobh; - submit_bh(READ, bh); - } - for (i = 0; i < nr_reads; i++) { - bh = read_bh[i]; - wait_on_buffer(bh); - if (!buffer_uptodate(bh)) - ret = -EIO; - free_buffer_head(bh); - read_bh[i] = NULL; - } - if (ret) - goto failed; - } - - if (is_mapped_to_disk) - SetPageMappedToDisk(page); - - return 0; - -failed: - for (i = 0; i < nr_reads; i++) { - if (read_bh[i]) - free_buffer_head(read_bh[i]); - } - - /* - * Error recovery is pretty slack. Clear the page and mark it dirty - * so we'll later zero out any blocks which _were_ allocated. - */ - zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0); - SetPageUptodate(page); - set_page_dirty(page); - return ret; -} -EXPORT_SYMBOL(nobh_prepare_write); - -/* - * Make sure any changes to nobh_commit_write() are reflected in - * nobh_truncate_page(), since it doesn't call commit_write(). - */ -int nobh_commit_write(struct file *file, struct page *page, - unsigned from, unsigned to) -{ - struct inode *inode = page->mapping->host; - loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; - - SetPageUptodate(page); - set_page_dirty(page); - if (pos > inode->i_size) { - i_size_write(inode, pos); - mark_inode_dirty(inode); - } - return 0; -} -EXPORT_SYMBOL(nobh_commit_write); - -/* * nobh_writepage() - based on block_full_write_page() except * that it tries to operate without attaching bufferheads to * the page. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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