NFS: Clean up nfs_scan_dirty()
Pass down struct writeback control.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 829af32..e046c9b 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -17,6 +17,7 @@
#include <linux/nfs_page.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_mount.h>
+#include <linux/writeback.h>
#define NFS_PARANOIA 1
@@ -268,11 +269,10 @@
#define NFS_SCAN_MAXENTRIES 16
/**
- * nfs_scan_lock_dirty - Scan the radix tree for dirty requests
- * @nfsi: NFS inode
+ * nfs_scan_dirty - Scan the radix tree for dirty requests
+ * @mapping: pointer to address space
+ * @wbc: writeback_control structure
* @dst: Destination list
- * @idx_start: lower bound of page->index to scan
- * @npages: idx_start + npages sets the upper bound to scan.
*
* Moves elements from one of the inode request lists.
* If the number of requests is set to 0, the entire address_space
@@ -280,46 +280,72 @@
* The requests are *not* checked to ensure that they form a contiguous set.
* You must be holding the inode's req_lock when calling this function
*/
-int
-nfs_scan_lock_dirty(struct nfs_inode *nfsi, struct list_head *dst,
- unsigned long idx_start, unsigned int npages)
+long nfs_scan_dirty(struct address_space *mapping,
+ struct writeback_control *wbc,
+ struct list_head *dst)
{
+ struct nfs_inode *nfsi = NFS_I(mapping->host);
struct nfs_page *pgvec[NFS_SCAN_MAXENTRIES];
struct nfs_page *req;
- unsigned long idx_end;
+ pgoff_t idx_start, idx_end;
+ long count = wbc->nr_to_write;
+ long res = 0;
int found, i;
- int res;
- res = 0;
- if (npages == 0)
- idx_end = ~0;
- else
- idx_end = idx_start + npages - 1;
+ if (nfsi->ndirty == 0 || count <= 0)
+ return 0;
+ if (wbc->range_cyclic) {
+ idx_start = 0;
+ idx_end = ULONG_MAX;
+ } else if (wbc->range_end == 0) {
+ idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
+ idx_end = ULONG_MAX;
+ } else {
+ idx_start = wbc->range_start >> PAGE_CACHE_SHIFT;
+ idx_end = wbc->range_end >> PAGE_CACHE_SHIFT;
+ }
for (;;) {
+ unsigned int toscan = NFS_SCAN_MAXENTRIES;
+
+ if (toscan > count)
+ toscan = count;
found = radix_tree_gang_lookup_tag(&nfsi->nfs_page_tree,
- (void **)&pgvec[0], idx_start, NFS_SCAN_MAXENTRIES,
+ (void **)&pgvec[0], idx_start, toscan,
NFS_PAGE_TAG_DIRTY);
+
+ /* Did we make progress? */
if (found <= 0)
break;
+
for (i = 0; i < found; i++) {
req = pgvec[i];
- if (req->wb_index > idx_end)
+ if (!wbc->range_cyclic && req->wb_index > idx_end)
goto out;
- idx_start = req->wb_index + 1;
+ /* Try to lock request and mark it for writeback */
+ if (!nfs_set_page_writeback_locked(req))
+ goto next;
+ radix_tree_tag_clear(&nfsi->nfs_page_tree,
+ req->wb_index, NFS_PAGE_TAG_DIRTY);
+ nfsi->ndirty--;
+ nfs_list_remove_request(req);
+ nfs_list_add_request(req, dst);
+ dec_zone_page_state(req->wb_page, NR_FILE_DIRTY);
+ res++;
+ if (res == LONG_MAX)
+ goto out;
+ count--;
+ if (count == 0)
+ goto out;
- if (nfs_set_page_writeback_locked(req)) {
- radix_tree_tag_clear(&nfsi->nfs_page_tree,
- req->wb_index, NFS_PAGE_TAG_DIRTY);
- nfs_list_remove_request(req);
- nfs_list_add_request(req, dst);
- dec_zone_page_state(req->wb_page, NR_FILE_DIRTY);
- res++;
- }
+next:
+ idx_start = req->wb_index + 1;
}
}
out:
+ wbc->nr_to_write = count;
+ WARN_ON ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty));
return res;
}
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 1d72096..dbc89fa 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -79,7 +79,7 @@
unsigned int, unsigned int);
static int nfs_wait_on_write_congestion(struct address_space *, int);
static int nfs_wait_on_requests(struct inode *, unsigned long, unsigned int);
-static int nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how);
+static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how);
static const struct rpc_call_ops nfs_write_partial_ops;
static const struct rpc_call_ops nfs_write_full_ops;
static const struct rpc_call_ops nfs_commit_ops;
@@ -400,10 +400,8 @@
goto out;
}
err = nfs_commit_inode(inode, wb_priority(wbc));
- if (err > 0) {
- wbc->nr_to_write -= err;
+ if (err > 0)
err = 0;
- }
out:
clear_bit(BDI_write_congested, &bdi->state);
wake_up_all(&nfs_write_congestion);
@@ -607,31 +605,6 @@
}
}
-/*
- * nfs_scan_dirty - Scan an inode for dirty requests
- * @inode: NFS inode to scan
- * @dst: destination list
- * @idx_start: lower bound of page->index to scan.
- * @npages: idx_start + npages sets the upper bound to scan.
- *
- * Moves requests from the inode's dirty page list.
- * The requests are *not* checked to ensure that they form a contiguous set.
- */
-static int
-nfs_scan_dirty(struct inode *inode, struct list_head *dst, unsigned long idx_start, unsigned int npages)
-{
- struct nfs_inode *nfsi = NFS_I(inode);
- int res = 0;
-
- if (nfsi->ndirty != 0) {
- res = nfs_scan_lock_dirty(nfsi, dst, idx_start, npages);
- nfsi->ndirty -= res;
- if ((nfsi->ndirty == 0) != list_empty(&nfsi->dirty))
- printk(KERN_ERR "NFS: desynchronized value of nfs_i.ndirty.\n");
- }
- return res;
-}
-
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
/*
* nfs_scan_commit - Scan an inode for commit requests
@@ -1467,22 +1440,19 @@
}
#endif
-static int nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
+static long nfs_flush_mapping(struct address_space *mapping, struct writeback_control *wbc, int how)
{
struct nfs_inode *nfsi = NFS_I(mapping->host);
LIST_HEAD(head);
- pgoff_t index = wbc->range_start >> PAGE_CACHE_SHIFT;
- unsigned long npages = 1 + (wbc->range_end >> PAGE_CACHE_SHIFT) - index;
- int res;
+ long res;
spin_lock(&nfsi->req_lock);
- res = nfs_scan_dirty(mapping->host, &head, index, npages);
+ res = nfs_scan_dirty(mapping, wbc, &head);
spin_unlock(&nfsi->req_lock);
if (res) {
int error = nfs_flush_list(mapping->host, &head, res, how);
if (error < 0)
return error;
- wbc->nr_to_write -= res;
}
return res;
}
@@ -1506,13 +1476,21 @@
}
#endif
-int nfs_sync_inode_wait(struct inode *inode, unsigned long idx_start,
+long nfs_sync_inode_wait(struct inode *inode, unsigned long idx_start,
unsigned int npages, int how)
{
struct nfs_inode *nfsi = NFS_I(inode);
+ struct address_space *mapping = inode->i_mapping;
+ struct writeback_control wbc = {
+ .bdi = mapping->backing_dev_info,
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = LONG_MAX,
+ .range_start = ((loff_t)idx_start) << PAGE_CACHE_SHIFT,
+ .range_end = ((loff_t)(idx_start + npages - 1)) << PAGE_CACHE_SHIFT,
+ };
LIST_HEAD(head);
int nocommit = how & FLUSH_NOCOMMIT;
- int pages, ret;
+ long pages, ret;
how &= ~FLUSH_NOCOMMIT;
spin_lock(&nfsi->req_lock);
@@ -1520,7 +1498,7 @@
ret = nfs_wait_on_requests_locked(inode, idx_start, npages);
if (ret != 0)
continue;
- pages = nfs_scan_dirty(inode, &head, idx_start, npages);
+ pages = nfs_scan_dirty(mapping, &wbc, &head);
if (pages != 0) {
spin_unlock(&nfsi->req_lock);
if (how & FLUSH_INVALIDATE) {
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 02f3818..f8190ae 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -432,7 +432,7 @@
* Try to write back everything synchronously (but check the
* return value!)
*/
-extern int nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
+extern long nfs_sync_inode_wait(struct inode *, unsigned long, unsigned int, int);
#if defined(CONFIG_NFS_V3) || defined(CONFIG_NFS_V4)
extern int nfs_commit_inode(struct inode *, int);
extern struct nfs_write_data *nfs_commit_alloc(void);
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 1f7bd28..38aa15f 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -60,8 +60,9 @@
extern void nfs_release_request(struct nfs_page *req);
-extern int nfs_scan_lock_dirty(struct nfs_inode *nfsi, struct list_head *dst,
- unsigned long idx_start, unsigned int npages);
+extern long nfs_scan_dirty(struct address_space *mapping,
+ struct writeback_control *wbc,
+ struct list_head *dst);
extern int nfs_scan_list(struct nfs_inode *nfsi, struct list_head *head, struct list_head *dst,
unsigned long idx_start, unsigned int npages);
extern int nfs_coalesce_requests(struct list_head *, struct list_head *,