From d7f124f129a6aea99938e0d4172c741b56fefeda Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Mon, 13 Jun 2011 16:22:18 -0700 Subject: [PATCH] ceph: fix sync and dio writes across stripe boundaries We were iterating across stripe boundaries properly, but not moving the write buffer pointer forward. This caused us to rewrite the same data after the break. Fix by adjusting the data pointer forward, and recalculating the io and buffer alignment after the break. Signed-off-by: Sage Weil --- fs/ceph/file.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 2be0f35..4698a5c 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -476,9 +476,6 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data, else pos = *offset; - io_align = pos & ~PAGE_MASK; - buf_align = (unsigned long)data & ~PAGE_MASK; - ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left); if (ret < 0) return ret; @@ -502,6 +499,8 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data, * boundary. this isn't atomic, unfortunately. :( */ more: + io_align = pos & ~PAGE_MASK; + buf_align = (unsigned long)data & ~PAGE_MASK; len = left; if (file->f_flags & O_DIRECT) { /* write from beginning of first page, regardless of @@ -591,6 +590,7 @@ out: pos += len; written += len; left -= len; + data += written; if (left) goto more; -- 2.7.4