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| author | Theodore Ts'o <tytso@mit.edu> | 2010-10-28 23:33:57 +0200 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2010-10-28 23:33:57 +0200 |
| commit | b1142e8fec6a594723e5054055a7b53379b90490 (patch) | |
| tree | 57d6234fa2eb33f861eaea4cee4a40a3ae44c09e /fs/ext4 | |
| parent | Merge branch 'upstream-merge' of git://git.kernel.org/pub/scm/linux/kernel/gi... (diff) | |
| download | linux-b1142e8fec6a594723e5054055a7b53379b90490.tar.xz linux-b1142e8fec6a594723e5054055a7b53379b90490.zip | |
ext4: BUG_ON fix: check if page has buffers before calling page_buffers()
We need to make check if a page does not have buffes by checking
page_has_buffers(page) before calling page_buffers(page) in
ext4_writepage(). Otherwise page_buffers() could throw a BUG_ON.
Thanks also to Markus Trippelsdorf and Avinash Kurup who also reported
the problem.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Sedat Dilek <sedat.dilek@googlemail.com>
Tested-by: Sedat Dilek <sedat.dilek@googlemail.com>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/inode.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 2d6c6c8c036d..191616470466 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2718,7 +2718,7 @@ static int ext4_writepage(struct page *page, * try to create them using __block_write_begin. If this * fails, redirty the page and move on. */ - if (!page_buffers(page)) { + if (!page_has_buffers(page)) { if (__block_write_begin(page, 0, len, noalloc_get_block_write)) { redirty_page: @@ -2732,12 +2732,10 @@ static int ext4_writepage(struct page *page, if (walk_page_buffers(NULL, page_bufs, 0, len, NULL, ext4_bh_delay_or_unwritten)) { /* - * We don't want to do block allocation So redirty the - * page and return We may reach here when we do a - * journal commit via - * journal_submit_inode_data_buffers. If we don't - * have mapping block we just ignore them. We can also - * reach here via shrink_page_list + * We don't want to do block allocation, so redirty + * the page and return. We may reach here when we do + * a journal commit via journal_submit_inode_data_buffers. + * We can also reach here via shrink_page_list */ goto redirty_page; } |