From: Andrew Morton Date: Mon, 2 Apr 2007 06:49:44 +0000 (-0700) Subject: [PATCH] revert "retries in ext4_prepare_write() violate ordering requirements" X-Git-Tag: v2.6.21-rc6~30 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=7479d2b90b103f84d956a7177b3f99cbd472b345;p=linux-2.6-omap-h63xx.git [PATCH] revert "retries in ext4_prepare_write() violate ordering requirements" Revert b46be05004abb419e303e66e143eed9f8a6e9f3f. Same reasoning as for ext3. Cc: Kirill Korotaev Cc: Ingo Molnar Cc: Ken Chen Cc: Andrey Savochkin Cc: Cc: Dmitriy Monakhov Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index fbff4b9e122..810b6d6474b 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1147,102 +1147,37 @@ static int do_journal_get_write_access(handle_t *handle, return ext4_journal_get_write_access(handle, bh); } -/* - * The idea of this helper function is following: - * if prepare_write has allocated some blocks, but not all of them, the - * transaction must include the content of the newly allocated blocks. - * This content is expected to be set to zeroes by block_prepare_write(). - * 2006/10/14 SAW - */ -static int ext4_prepare_failure(struct file *file, struct page *page, - unsigned from, unsigned to) -{ - struct address_space *mapping; - struct buffer_head *bh, *head, *next; - unsigned block_start, block_end; - unsigned blocksize; - int ret; - handle_t *handle = ext4_journal_current_handle(); - - mapping = page->mapping; - if (ext4_should_writeback_data(mapping->host)) { - /* optimization: no constraints about data */ -skip: - return ext4_journal_stop(handle); - } - - head = page_buffers(page); - blocksize = head->b_size; - for ( bh = head, block_start = 0; - bh != head || !block_start; - block_start = block_end, bh = next) - { - next = bh->b_this_page; - block_end = block_start + blocksize; - if (block_end <= from) - continue; - if (block_start >= to) { - block_start = to; - break; - } - if (!buffer_mapped(bh)) - /* prepare_write failed on this bh */ - break; - if (ext4_should_journal_data(mapping->host)) { - ret = do_journal_get_write_access(handle, bh); - if (ret) { - ext4_journal_stop(handle); - return ret; - } - } - /* - * block_start here becomes the first block where the current iteration - * of prepare_write failed. - */ - } - if (block_start <= from) - goto skip; - - /* commit allocated and zeroed buffers */ - return mapping->a_ops->commit_write(file, page, from, block_start); -} - static int ext4_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) { struct inode *inode = page->mapping->host; - int ret, ret2; - int needed_blocks = ext4_writepage_trans_blocks(inode); + int ret, needed_blocks = ext4_writepage_trans_blocks(inode); handle_t *handle; int retries = 0; retry: handle = ext4_journal_start(inode, needed_blocks); - if (IS_ERR(handle)) - return PTR_ERR(handle); + if (IS_ERR(handle)) { + ret = PTR_ERR(handle); + goto out; + } if (test_opt(inode->i_sb, NOBH) && ext4_should_writeback_data(inode)) ret = nobh_prepare_write(page, from, to, ext4_get_block); else ret = block_prepare_write(page, from, to, ext4_get_block); if (ret) - goto failure; + goto prepare_write_failed; if (ext4_should_journal_data(inode)) { ret = walk_page_buffers(handle, page_buffers(page), from, to, NULL, do_journal_get_write_access); - if (ret) - /* fatal error, just put the handle and return */ - ext4_journal_stop(handle); } - return ret; - -failure: - ret2 = ext4_prepare_failure(file, page, from, to); - if (ret2 < 0) - return ret2; +prepare_write_failed: + if (ret) + ext4_journal_stop(handle); if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries)) goto retry; - /* retry number exceeded, or other error like -EDQUOT */ +out: return ret; }