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authorTheodore Ts'o <tytso@mit.edu>2011-02-27 16:43:24 -0500
committerTheodore Ts'o <tytso@mit.edu>2011-02-27 16:43:24 -0500
commita54aa76108619e5d8290b49081c2aaaeff5be9a2 (patch)
treea3c436e29b5452f9c17bffc7bbc6b8f437c3255c /fs/ext4
parent168fc0223c0e944957b1f31d88c2334fc904baf1 (diff)
downloadop-kernel-dev-a54aa76108619e5d8290b49081c2aaaeff5be9a2.zip
op-kernel-dev-a54aa76108619e5d8290b49081c2aaaeff5be9a2.tar.gz
ext4: don't leave PageWriteback set after memory failure
In ext4_bio_write_page(), if the memory allocation for the struct ext4_io_page fails, it returns with the page's PageWriteback flag set. This will end up causing the page not to skip writeback in WB_SYNC_NONE mode, and in WB_SYNC_ALL mode (i.e., on a sync, fsync, or umount) the writeback daemon will get stuck forever on the wait_on_page_writeback() function in write_cache_pages_da(). Or, if journalling is enabled and the file gets deleted, it the journal thread can get stuck in journal_finish_inode_data_buffers() call to filemap_fdatawait(). Another place where things can get hung up is in truncate_inode_pages(), called out of ext4_evict_inode(). Fix this by not setting PageWriteback until after we have successfully allocated the struct ext4_io_page. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/page-io.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 68d92a8..d5c391f 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -381,8 +381,6 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
BUG_ON(!PageLocked(page));
BUG_ON(PageWriteback(page));
- set_page_writeback(page);
- ClearPageError(page);
io_page = kmem_cache_alloc(io_page_cachep, GFP_NOFS);
if (!io_page) {
@@ -393,6 +391,8 @@ int ext4_bio_write_page(struct ext4_io_submit *io,
io_page->p_page = page;
atomic_set(&io_page->p_count, 1);
get_page(page);
+ set_page_writeback(page);
+ ClearPageError(page);
for (bh = head = page_buffers(page), block_start = 0;
bh != head || !block_start;
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