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pnfs/flexfiles: add ff_layout_prepare_layoutstats

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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>
This commit is contained in:
Peng Tao 2015-06-23 19:52:01 +08:00 committed by Trond Myklebust
parent d983803d38
commit ad4dc53e64
1 changed files with 71 additions and 0 deletions
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71
fs/nfs/flexfilelayout/flexfilelayout.c
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@ -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)