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Subject[PATCH 17/19] orangefs: implement writepages
Date
Go through pages and look for a consecutive writable region.  After
finding 128 consecutive writable pages or when finding a non-consecutive
region, do the write.

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
---
fs/orangefs/file.c | 1 +
fs/orangefs/inode.c | 144 +++++++++++++++++++++++++++++++++-
fs/orangefs/orangefs-kernel.h | 1 +
fs/orangefs/super.c | 1 +
4 files changed, 145 insertions(+), 2 deletions(-)

diff --git a/fs/orangefs/file.c b/fs/orangefs/file.c
index d5ecfea3288a..0d9cef37404f 100644
--- a/fs/orangefs/file.c
+++ b/fs/orangefs/file.c
@@ -491,6 +491,7 @@ static int orangefs_file_release(struct inode *inode, struct file *file)
gossip_debug(GOSSIP_INODE_DEBUG,
"flush_racache finished\n");
}
+
}
return 0;
}
diff --git a/fs/orangefs/inode.c b/fs/orangefs/inode.c
index f53d768acdd9..9a41b7d2ce54 100644
--- a/fs/orangefs/inode.c
+++ b/fs/orangefs/inode.c
@@ -15,6 +15,8 @@
#include "orangefs-kernel.h"
#include "orangefs-bufmap.h"

+#define ORANGEFS_WRITEPAGES_COUNT 128
+
static int orangefs_writepage_locked(struct page *page,
struct writeback_control *wbc)
{
@@ -44,10 +46,10 @@ static int orangefs_writepage_locked(struct page *page,
len = i_size_read(inode);
}
} else {
-/* BUG();*/
+ end_page_writeback(page);
/* It's not private so there's nothing to write, right? */
printk("writepage not private!\n");
- end_page_writeback(page);
+ BUG();
return 0;

}
@@ -230,6 +232,143 @@ static int orangefs_readpage(struct file *file, struct page *page)
return ret;
}

+struct orangefs_writepages {
+ loff_t off;
+ size_t len;
+ kuid_t uid;
+ kgid_t gid;
+ struct page *pages[ORANGEFS_WRITEPAGES_COUNT];
+ int npages;
+ struct bio_vec bv[ORANGEFS_WRITEPAGES_COUNT];
+};
+
+static int orangefs_writepages_work(struct orangefs_writepages *ow,
+ struct writeback_control *wbc)
+{
+ struct inode *inode = ow->pages[0]->mapping->host;
+ struct orangefs_write_request *wrp, wr;
+ struct iov_iter iter;
+ ssize_t ret;
+ loff_t off;
+ int i;
+
+ for (i = 0; i < ow->npages; i++) {
+ set_page_writeback(ow->pages[i]);
+ ow->bv[i].bv_page = ow->pages[i];
+ /* uh except the last one maybe... */
+ if (i == ow->npages - 1 && ow->len % PAGE_SIZE)
+ ow->bv[i].bv_len = ow->len % PAGE_SIZE;
+ else
+ ow->bv[i].bv_len = PAGE_SIZE;
+ ow->bv[i].bv_offset = 0;
+ }
+ iov_iter_bvec(&iter, ITER_BVEC | WRITE, ow->bv, ow->npages, ow->len);
+
+ off = ow->off;
+ wr.uid = ow->uid;
+ wr.gid = ow->gid;
+ ret = wait_for_direct_io(ORANGEFS_IO_WRITE, inode, &off, &iter, ow->len,
+ 0, &wr);
+ if (ret < 0) {
+ for (i = 0; i < ow->npages; i++) {
+ SetPageError(ow->pages[i]);
+ mapping_set_error(ow->pages[i]->mapping, ret);
+ end_page_writeback(ow->pages[i]);
+ unlock_page(ow->pages[i]);
+ }
+ } else {
+ for (i = 0; i < ow->npages; i++) {
+ if (PagePrivate(ow->pages[i])) {
+ wrp = (struct orangefs_write_request *)
+ page_private(ow->pages[i]);
+ ClearPagePrivate(ow->pages[i]);
+ wr_release(wrp);
+ }
+ end_page_writeback(ow->pages[i]);
+ unlock_page(ow->pages[i]);
+ }
+ }
+ return ret;
+}
+
+static int orangefs_writepages_callback(struct page *page,
+ struct writeback_control *wbc, void *data)
+{
+ struct orangefs_writepages *ow = data;
+ struct orangefs_write_request *wr;
+ int ret;
+
+ if (!PagePrivate(page)) {
+ unlock_page(page);
+ /* It's not private so there's nothing to write, right? */
+ printk("writepages_callback not private!\n");
+ BUG();
+ return 0;
+ }
+ wr = (struct orangefs_write_request *)page_private(page);
+
+ if (wr->len != PAGE_SIZE) {
+ ret = orangefs_writepage_locked(page, wbc);
+ mapping_set_error(page->mapping, ret);
+ unlock_page(page);
+ } else {
+ ret = -1;
+ if (ow->npages == 0) {
+ ow->off = wr->pos;
+ ow->len = wr->len;
+ ow->uid = wr->uid;
+ ow->gid = wr->gid;
+ ow->pages[ow->npages++] = page;
+ ret = 0;
+ goto done;
+ }
+ if (!uid_eq(ow->uid, wr->uid) || !gid_eq(ow->gid, wr->gid)) {
+ orangefs_writepages_work(ow, wbc);
+ memset(ow, 0, sizeof *ow);
+ ret = -1;
+ goto done;
+ }
+ if (ow->off + ow->len == wr->pos) {
+ ow->len += wr->len;
+ ow->pages[ow->npages++] = page;
+ ret = 0;
+ goto done;
+ }
+done:
+ if (ret == -1) {
+ ret = orangefs_writepage_locked(page, wbc);
+ mapping_set_error(page->mapping, ret);
+ unlock_page(page);
+ } else {
+ if (ow->npages == ORANGEFS_WRITEPAGES_COUNT) {
+ orangefs_writepages_work(ow, wbc);
+ memset(ow, 0, sizeof *ow);
+ }
+ }
+ }
+ return ret;
+}
+
+static int orangefs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct orangefs_writepages *ow;
+ struct blk_plug plug;
+ int ret;
+ ow = kzalloc(sizeof(struct orangefs_writepages), GFP_KERNEL);
+ if (!ow)
+ return -ENOMEM;
+ mutex_lock(&ORANGEFS_SB(mapping->host->i_sb)->writepages_mutex);
+ blk_start_plug(&plug);
+ ret = write_cache_pages(mapping, wbc, orangefs_writepages_callback, ow);
+ if (ow->npages)
+ ret = orangefs_writepages_work(ow, wbc);
+ blk_finish_plug(&plug);
+ mutex_unlock(&ORANGEFS_SB(mapping->host->i_sb)->writepages_mutex);
+ kfree(ow);
+ return ret;
+}
+
static int orangefs_write_begin(struct file *file,
struct address_space *mapping, loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
@@ -348,6 +487,7 @@ static int orangefs_launder_page(struct page *page)
static const struct address_space_operations orangefs_address_operations = {
.writepage = orangefs_writepage,
.readpage = orangefs_readpage,
+ .writepages = orangefs_writepages,
.set_page_dirty = __set_page_dirty_nobuffers,
.write_begin = orangefs_write_begin,
.write_end = orangefs_write_end,
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index 256851bab7a5..9e23f97fb5cc 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -220,6 +220,7 @@ struct orangefs_sb_info_s {
int mount_pending;
int no_list;
struct list_head list;
+ struct mutex writepages_mutex;
};

struct orangefs_stats {
diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c
index 83abe5ec2d11..204e1ac7f228 100644
--- a/fs/orangefs/super.c
+++ b/fs/orangefs/super.c
@@ -467,6 +467,7 @@ static int orangefs_fill_sb(struct super_block *sb,

sb->s_export_op = &orangefs_export_ops;
sb->s_root = root_dentry;
+ mutex_init(&ORANGEFS_SB(sb)->writepages_mutex);
return 0;
}

--
2.19.0
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