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Message-Id: <200704020649.l326niVR026539@shell0.pdx.osdl.net>
Date: Sun, 01 Apr 2007 23:49:44 -0700
From: akpm@...ux-foundation.org
To: torvalds@...ux-foundation.org
Cc: akpm@...ux-foundation.org, dev@...nvz.org, dmonakhov@...nvz.org,
kenneth.w.chen@...el.com, linux-ext4@...r.kernel.org,
mingo@...e.hu, saw@...ru, stable@...nel.org
Subject: [patch 07/12] revert "retries in ext4_prepare_write() violate ordering requirements"
From: Andrew Morton <akpm@...ux-foundation.org>
Revert b46be05004abb419e303e66e143eed9f8a6e9f3f. Same reasoning as for ext3.
Cc: Kirill Korotaev <dev@...nvz.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Ken Chen <kenneth.w.chen@...el.com>
Cc: Andrey Savochkin <saw@...ru>
Cc: <linux-ext4@...r.kernel.org>
Cc: Dmitriy Monakhov <dmonakhov@...nvz.org>
Cc: <stable@...nel.org>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---
fs/ext4/inode.c | 85 +++++-----------------------------------------
1 file changed, 10 insertions(+), 75 deletions(-)
diff -puN fs/ext4/inode.c~revert-retries-in-ext4_prepare_write-violate-ordering-requirements fs/ext4/inode.c
--- a/fs/ext4/inode.c~revert-retries-in-ext4_prepare_write-violate-ordering-requirements
+++ a/fs/ext4/inode.c
@@ -1147,102 +1147,37 @@ static int do_journal_get_write_access(h
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;
}
_
-
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