pnfs: let layoutcommit handle a list of lseg

commit a9bae5666d0510ad69bdb437371c9a3e6b770705 upstream.

There can be multiple lseg per file, so layoutcommit should be
able to handle it.

[Needed in v3.0]
Signed-off-by: Peng Tao <peng_tao@emc.com>
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: Jim Rees <rees@umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 5879b23..92cfd2e 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -5850,9 +5850,15 @@ nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
 static void nfs4_layoutcommit_release(void *calldata)
 {
        struct nfs4_layoutcommit_data *data = calldata;
+       struct pnfs_layout_segment *lseg, *tmp;
 
        /* Matched by references in pnfs_set_layoutcommit */
-       put_lseg(data->lseg);
+       list_for_each_entry_safe(lseg, tmp, &data->lseg_list, pls_lc_list) {
+               list_del_init(&lseg->pls_lc_list);
+               if (test_and_clear_bit(NFS_LSEG_LAYOUTCOMMIT,
+                                      &lseg->pls_flags))
+                       put_lseg(lseg);
+       }
        put_rpccred(data->cred);
        kfree(data);
 }

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index baa2a04..a726c0a 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -224,6 +224,7 @@ static void
 init_lseg(struct pnfs_layout_hdr *lo, struct pnfs_layout_segment *lseg)
 {
        INIT_LIST_HEAD(&lseg->pls_list);
+       INIT_LIST_HEAD(&lseg->pls_lc_list);
        atomic_set(&lseg->pls_refcount, 1);
        smp_mb();
        set_bit(NFS_LSEG_VALID, &lseg->pls_flags);
@@ -1201,16 +1202,17 @@ pnfs_try_to_read_data(struct nfs_read_data *rdata,
 }
 
 /*
- * Currently there is only one (whole file) write lseg.
+ * There can be multiple RW segments.
  */
-static struct pnfs_layout_segment *pnfs_list_write_lseg(struct inode *inode)
+static void pnfs_list_write_lseg(struct inode *inode, struct list_head *listp)
 {
-       struct pnfs_layout_segment *lseg, *rv = NULL;
+       struct pnfs_layout_segment *lseg;
 
-       list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list)
-               if (lseg->pls_range.iomode == IOMODE_RW)
-                       rv = lseg;
-       return rv;
+       list_for_each_entry(lseg, &NFS_I(inode)->layout->plh_segs, pls_list) {
+               if (lseg->pls_range.iomode == IOMODE_RW &&
+                   test_bit(NFS_LSEG_LAYOUTCOMMIT, &lseg->pls_flags))
+                       list_add(&lseg->pls_lc_list, listp);
+       }
 }
 
 void
@@ -1222,12 +1224,14 @@ pnfs_set_layoutcommit(struct nfs_write_data *wdata)
 
        spin_lock(&nfsi->vfs_inode.i_lock);
        if (!test_and_set_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
-               /* references matched in nfs4_layoutcommit_release */
-               get_lseg(wdata->lseg);
                mark_as_dirty = true;
                dprintk("%s: Set layoutcommit for inode %lu ",
                        __func__, wdata->inode->i_ino);
        }
+       if (!test_and_set_bit(NFS_LSEG_LAYOUTCOMMIT, &wdata->lseg->pls_flags)) {
+               /* references matched in nfs4_layoutcommit_release */
+               get_lseg(wdata->lseg);
+       }
        if (end_pos > nfsi->layout->plh_lwb)
                nfsi->layout->plh_lwb = end_pos;
        spin_unlock(&nfsi->vfs_inode.i_lock);
@@ -1254,7 +1258,6 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
 {
        struct nfs4_layoutcommit_data *data;
        struct nfs_inode *nfsi = NFS_I(inode);
-       struct pnfs_layout_segment *lseg;
        loff_t end_pos;
        int status = 0;
 
@@ -1271,17 +1274,15 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
                goto out;
        }
 
+       INIT_LIST_HEAD(&data->lseg_list);
        spin_lock(&inode->i_lock);
        if (!test_and_clear_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) {
                spin_unlock(&inode->i_lock);
                kfree(data);
                goto out;
        }
-       /*
-        * Currently only one (whole file) write lseg which is referenced
-        * in pnfs_set_layoutcommit and will be found.
-        */
-       lseg = pnfs_list_write_lseg(inode);
+
+       pnfs_list_write_lseg(inode, &data->lseg_list);
 
        end_pos = nfsi->layout->plh_lwb;
        nfsi->layout->plh_lwb = 0;
@@ -1291,7 +1292,6 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
        spin_unlock(&inode->i_lock);
 
        data->args.inode = inode;
-       data->lseg = lseg;
        data->cred = get_rpccred(nfsi->layout->plh_lc_cred);
        nfs_fattr_init(&data->fattr);
        data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;

diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 6969594..9d147d9 100644 (file)
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -36,10 +36,12 @@
 enum {
        NFS_LSEG_VALID = 0,     /* cleared when lseg is recalled/returned */
        NFS_LSEG_ROC,           /* roc bit received from server */
+       NFS_LSEG_LAYOUTCOMMIT,  /* layoutcommit bit set for layoutcommit */
 };
 
 struct pnfs_layout_segment {
        struct list_head pls_list;
+       struct list_head pls_lc_list;
        struct pnfs_layout_range pls_range;
        atomic_t pls_refcount;
        unsigned long pls_flags;

diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 00848d8..be2eba7 100644 (file)
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -262,7 +262,7 @@ struct nfs4_layoutcommit_res {
 struct nfs4_layoutcommit_data {
        struct rpc_task task;
        struct nfs_fattr fattr;
-       struct pnfs_layout_segment *lseg;
+       struct list_head lseg_list;
        struct rpc_cred *cred;
        struct nfs4_layoutcommit_args args;
        struct nfs4_layoutcommit_res res;