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authorPeng Tao <tao.peng@primarydata.com>2015-06-23 14:52:01 +0300
committerTrond Myklebust <trond.myklebust@primarydata.com>2015-06-24 17:53:11 +0300
commitad4dc53e6496ba0b3c18aeda6f3367d9800b6ebf (patch)
tree911cb79b3c357f8058df5af8288039042f8c82a7 /fs/nfs/flexfilelayout
parentd983803d3818a7aef3200147c72a45f573d84537 (diff)
downloadlinux-ad4dc53e6496ba0b3c18aeda6f3367d9800b6ebf.tar.xz
pnfs/flexfiles: add ff_layout_prepare_layoutstats
It fills in the generic part of LAYOUTSTATS call. One thing to note is that we don't really track if IO is continuous or not. So just fake to use the completed bytes for it. Still missing flexfiles specific part, which will be included in the next patch. Reviewed-by: Jeff Layton <jeff.layton@primarydata.com> Signed-off-by: Peng Tao <tao.peng@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/flexfilelayout')
-rw-r--r--fs/nfs/flexfilelayout/flexfilelayout.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index 4215278c9c76..cd999af504d9 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -20,6 +20,7 @@
#include "../nfs4trace.h"
#include "../iostat.h"
#include "../nfs.h"
+#include "../nfs42.h"
#define NFSDBG_FACILITY NFSDBG_PNFS_LD
@@ -1659,6 +1660,75 @@ out:
dprintk("%s: Return\n", __func__);
}
+static bool
+ff_layout_mirror_prepare_stats(struct nfs42_layoutstat_args *args,
+ struct pnfs_layout_segment *pls,
+ int *dev_count, int dev_limit)
+{
+ struct nfs4_ff_layout_mirror *mirror;
+ struct nfs4_deviceid_node *dev;
+ struct nfs42_layoutstat_devinfo *devinfo;
+ int i;
+
+ for (i = 0; i <= FF_LAYOUT_MIRROR_COUNT(pls); i++) {
+ if (*dev_count >= dev_limit)
+ break;
+ mirror = FF_LAYOUT_COMP(pls, i);
+ dev = FF_LAYOUT_DEVID_NODE(pls, i);
+ devinfo = &args->devinfo[*dev_count];
+ memcpy(&devinfo->dev_id, &dev->deviceid, NFS4_DEVICEID4_SIZE);
+ devinfo->offset = pls->pls_range.offset;
+ devinfo->length = pls->pls_range.length;
+ /* well, we don't really know if IO is continuous or not! */
+ devinfo->read_count = mirror->read_stat.io_stat.bytes_completed;
+ devinfo->read_bytes = mirror->read_stat.io_stat.bytes_completed;
+ devinfo->write_count = mirror->write_stat.io_stat.bytes_completed;
+ devinfo->write_bytes = mirror->write_stat.io_stat.bytes_completed;
+ devinfo->layout_type = LAYOUT_FLEX_FILES;
+ devinfo->layoutstats_encode = NULL;
+ devinfo->layout_private = NULL;
+
+ ++(*dev_count);
+ }
+
+ return *dev_count < dev_limit;
+}
+
+static int
+ff_layout_prepare_layoutstats(struct nfs42_layoutstat_args *args)
+{
+ struct pnfs_layout_segment *pls;
+ int dev_count = 0;
+
+ spin_lock(&args->inode->i_lock);
+ list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
+ dev_count += FF_LAYOUT_MIRROR_COUNT(pls);
+ }
+ spin_unlock(&args->inode->i_lock);
+ /* For now, send at most PNFS_LAYOUTSTATS_MAXDEV statistics */
+ if (dev_count > PNFS_LAYOUTSTATS_MAXDEV) {
+ dprintk("%s: truncating devinfo to limit (%d:%d)\n",
+ __func__, dev_count, PNFS_LAYOUTSTATS_MAXDEV);
+ dev_count = PNFS_LAYOUTSTATS_MAXDEV;
+ }
+ args->devinfo = kmalloc(dev_count * sizeof(*args->devinfo), GFP_KERNEL);
+ if (!args->devinfo)
+ return -ENOMEM;
+
+ dev_count = 0;
+ spin_lock(&args->inode->i_lock);
+ list_for_each_entry(pls, &NFS_I(args->inode)->layout->plh_segs, pls_list) {
+ if (!ff_layout_mirror_prepare_stats(args, pls, &dev_count,
+ PNFS_LAYOUTSTATS_MAXDEV)) {
+ break;
+ }
+ }
+ spin_unlock(&args->inode->i_lock);
+ args->num_dev = dev_count;
+
+ return 0;
+}
+
static struct pnfs_layoutdriver_type flexfilelayout_type = {
.id = LAYOUT_FLEX_FILES,
.name = "LAYOUT_FLEX_FILES",
@@ -1681,6 +1751,7 @@ static struct pnfs_layoutdriver_type flexfilelayout_type = {
.alloc_deviceid_node = ff_layout_alloc_deviceid_node,
.encode_layoutreturn = ff_layout_encode_layoutreturn,
.sync = pnfs_nfs_generic_sync,
+ .prepare_layoutstats = ff_layout_prepare_layoutstats,
};
static int __init nfs4flexfilelayout_init(void)