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pnfs: add pnfs_report_layoutstat helper function

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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 19:51:57 +08:00 • committed by Trond Myklebust
parent 1b4a4bd82c
commit 8733408d6e
3 changed files with 56 additions and 0 deletions
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49
fs/nfs/pnfs.c
View file

@ -35,6 +35,7 @@
#include "iostat.h"
#include "nfs4trace.h"
#include "delegation.h"
#include "nfs42.h"
#define NFSDBG_FACILITY NFSDBG_PNFS
#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ)
@ -2250,3 +2251,51 @@ struct nfs4_threshold *pnfs_mdsthreshold_alloc(void)
}
return thp;
}
int
pnfs_report_layoutstat(struct inode *inode)
{
struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
struct nfs_server *server = NFS_SERVER(inode);
struct nfs42_layoutstat_data *data;
struct pnfs_layout_hdr *hdr;
int status = 0;
if (!pnfs_enabled_sb(server) || !ld->prepare_layoutstats)
goto out;
spin_lock(&inode->i_lock);
if (!NFS_I(inode)->layout) {
spin_unlock(&inode->i_lock);
goto out;
}
hdr = NFS_I(inode)->layout;
pnfs_get_layout_hdr(hdr);
spin_unlock(&inode->i_lock);
data = kzalloc(sizeof(*data), GFP_KERNEL);
if (!data) {
status = -ENOMEM;
goto out_put;
}
data->args.fh = NFS_FH(inode);
data->args.inode = inode;
nfs4_stateid_copy(&data->args.stateid, &hdr->plh_stateid);
status = ld->prepare_layoutstats(&data->args);
if (status)
goto out_free;
status = nfs42_proc_layoutstats_generic(NFS_SERVER(inode), data);
out:
dprintk("%s returns %d\n", __func__, status);
return status;
out_free:
kfree(data);
out_put:
pnfs_put_layout_hdr(hdr);
goto out;
}
EXPORT_SYMBOL_GPL(pnfs_report_layoutstat);