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libceph: distinguish page and bio requests

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An osd request uses either pages or a bio list for its data.  Use a
union to record information about the two, and add a data type
tag to select between them.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
This commit is contained in:
Alex Elder
2013-02-14 12:16:43 -06:00
committed by Sage Weil
parent 2794a82a11
commit 2ac2b7a6d4
5 changed files with 54 additions and 20 deletions
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4
fs/ceph/addr.c
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@@ -243,6 +243,7 @@ static void finish_read(struct ceph_osd_request *req, struct ceph_msg *msg)
dout("finish_read %p req %p rc %d bytes %d\n", inode, req, rc, bytes);
/* unlock all pages, zeroing any data we didn't read */
BUG_ON(req->r_data.type != CEPH_OSD_DATA_TYPE_PAGES);
for (i = 0; i < req->r_data.num_pages; i++, bytes -= PAGE_CACHE_SIZE) {
struct page *page = req->r_data.pages[i];
@@ -336,6 +337,7 @@ static int start_read(struct inode *inode, struct list_head *page_list, int max)
}
pages[i] = page;
}
req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
req->r_data.pages = pages;
req->r_data.num_pages = nr_pages;
req->r_data.alignment = 0;
@@ -561,6 +563,7 @@ static void writepages_finish(struct ceph_osd_request *req,
long writeback_stat;
unsigned issued = ceph_caps_issued(ci);
BUG_ON(req->r_data.type != CEPH_OSD_DATA_TYPE_PAGES);
if (rc >= 0) {
/*
* Assume we wrote the pages we originally sent. The
@@ -830,6 +833,7 @@ get_more_pages:
break;
}
req->r_data.type = CEPH_OSD_DATA_TYPE_PAGES;
req->r_data.num_pages = calc_pages_for(0, len);
req->r_data.alignment = 0;
max_pages = req->r_data.num_pages;