Merge branch 'nfs-for-2.6.37' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
Merge commit. Changes below are compared with the first parent: b18cae42.
Changes
24 files changed · +2550 −45
Only the first 600 diff lines are shown. Download the complete patch.
Documentation/filesystems/nfs/00-INDEX
View filediff --git a/Documentation/filesystems/nfs/00-INDEX b/Documentation/filesystems/nfs/00-INDEX
index 3225a56..a57e124 100644
--- a/Documentation/filesystems/nfs/00-INDEX
+++ b/Documentation/filesystems/nfs/00-INDEX
@@ -12,6 +12,8 @@ nfs-rdma.txt
- how to install and setup the Linux NFS/RDMA client and server software
nfsroot.txt
- short guide on setting up a diskless box with NFS root filesystem.
+pnfs.txt
+ - short explanation of some of the internals of the pnfs client code
rpc-cache.txt
- introduction to the caching mechanisms in the sunrpc layer.
idmapper.txt
Documentation/filesystems/nfs/pnfs.txt
View filediff --git a/Documentation/filesystems/nfs/pnfs.txt b/Documentation/filesystems/nfs/pnfs.txt
new file mode 100644
index 0000000..bc0b9cf
--- /dev/null
+++ b/Documentation/filesystems/nfs/pnfs.txt
@@ -0,0 +1,48 @@
+Reference counting in pnfs:
+==========================
+
+The are several inter-related caches. We have layouts which can
+reference multiple devices, each of which can reference multiple data servers.
+Each data server can be referenced by multiple devices. Each device
+can be referenced by multiple layouts. To keep all of this straight,
+we need to reference count.
+
+
+struct pnfs_layout_hdr
+----------------------
+The on-the-wire command LAYOUTGET corresponds to struct
+pnfs_layout_segment, usually referred to by the variable name lseg.
+Each nfs_inode may hold a pointer to a cache of of these layout
+segments in nfsi->layout, of type struct pnfs_layout_hdr.
+
+We reference the header for the inode pointing to it, across each
+outstanding RPC call that references it (LAYOUTGET, LAYOUTRETURN,
+LAYOUTCOMMIT), and for each lseg held within.
+
+Each header is also (when non-empty) put on a list associated with
+struct nfs_client (cl_layouts). Being put on this list does not bump
+the reference count, as the layout is kept around by the lseg that
+keeps it in the list.
+
+deviceid_cache
+--------------
+lsegs reference device ids, which are resolved per nfs_client and
+layout driver type. The device ids are held in a RCU cache (struct
+nfs4_deviceid_cache). The cache itself is referenced across each
+mount. The entries (struct nfs4_deviceid) themselves are held across
+the lifetime of each lseg referencing them.
+
+RCU is used because the deviceid is basically a write once, read many
+data structure. The hlist size of 32 buckets needs better
+justification, but seems reasonable given that we can have multiple
+deviceid's per filesystem, and multiple filesystems per nfs_client.
+
+The hash code is copied from the nfsd code base. A discussion of
+hashing and variations of this algorithm can be found at:
+http://groups.google.com/group/comp.lang.c/browse_thread/thread/9522965e2b8d3809
+
+data server cache
+-----------------
+file driver devices refer to data servers, which are kept in a module
+level cache. Its reference is held over the lifetime of the deviceid
+pointing to it.
fs/nfs/Kconfig
View filediff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 5c55c26..fd66765 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -77,13 +77,17 @@ config NFS_V4
config NFS_V4_1
bool "NFS client support for NFSv4.1 (EXPERIMENTAL)"
- depends on NFS_V4 && EXPERIMENTAL
+ depends on NFS_FS && NFS_V4 && EXPERIMENTAL
+ select PNFS_FILE_LAYOUT
help
This option enables support for minor version 1 of the NFSv4 protocol
- (draft-ietf-nfsv4-minorversion1) in the kernel's NFS client.
+ (RFC 5661) in the kernel's NFS client.
If unsure, say N.
+config PNFS_FILE_LAYOUT
+ tristate
+
config ROOT_NFS
bool "Root file system on NFS"
depends on NFS_FS=y && IP_PNP
fs/nfs/Makefile
View filediff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index da7fda6..4776ff9 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -15,5 +15,9 @@ nfs-$(CONFIG_NFS_V4) += nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o \
delegation.o idmap.o \
callback.o callback_xdr.o callback_proc.o \
nfs4namespace.o
+nfs-$(CONFIG_NFS_V4_1) += pnfs.o
nfs-$(CONFIG_SYSCTL) += sysctl.o
nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
+
+obj-$(CONFIG_PNFS_FILE_LAYOUT) += nfs_layout_nfsv41_files.o
+nfs_layout_nfsv41_files-y := nfs4filelayout.o nfs4filelayoutdev.o
fs/nfs/callback_proc.c
View filediff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 930d10f..2950fca 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -118,11 +118,11 @@ int nfs41_validate_delegation_stateid(struct nfs_delegation *delegation, const n
if (delegation == NULL)
return 0;
- /* seqid is 4-bytes long */
- if (((u32 *) &stateid->data)[0] != 0)
+ if (stateid->stateid.seqid != 0)
return 0;
- if (memcmp(&delegation->stateid.data[4], &stateid->data[4],
- sizeof(stateid->data)-4))
+ if (memcmp(&delegation->stateid.stateid.other,
+ &stateid->stateid.other,
+ NFS4_STATEID_OTHER_SIZE))
return 0;
return 1;
fs/nfs/client.c
View filediff --git a/fs/nfs/client.c b/fs/nfs/client.c
index a882785..fd6f0a7 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -48,6 +48,7 @@
#include "iostat.h"
#include "internal.h"
#include "fscache.h"
+#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
@@ -155,7 +156,9 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
cred = rpc_lookup_machine_cred();
if (!IS_ERR(cred))
clp->cl_machine_cred = cred;
-
+#if defined(CONFIG_NFS_V4_1)
+ INIT_LIST_HEAD(&clp->cl_layouts);
+#endif
nfs_fscache_get_client_cookie(clp);
return clp;
@@ -252,6 +255,7 @@ void nfs_put_client(struct nfs_client *clp)
nfs_free_client(clp);
}
}
+EXPORT_SYMBOL_GPL(nfs_put_client);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
/*
@@ -900,6 +904,8 @@ static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *
if (server->wsize > NFS_MAX_FILE_IO_SIZE)
server->wsize = NFS_MAX_FILE_IO_SIZE;
server->wpages = (server->wsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+ set_pnfs_layoutdriver(server, fsinfo->layouttype);
+
server->wtmult = nfs_block_bits(fsinfo->wtmult, NULL);
server->dtsize = nfs_block_size(fsinfo->dtpref, NULL);
@@ -939,6 +945,7 @@ static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, str
}
fsinfo.fattr = fattr;
+ fsinfo.layouttype = 0;
error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo);
if (error < 0)
goto out_error;
@@ -1021,6 +1028,7 @@ void nfs_free_server(struct nfs_server *server)
{
dprintk("--> nfs_free_server()\n");
+ unset_pnfs_layoutdriver(server);
spin_lock(&nfs_client_lock);
list_del(&server->client_link);
list_del(&server->master_link);
fs/nfs/file.c
View filediff --git a/fs/nfs/file.c b/fs/nfs/file.c
index e18c31e..e756075 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -36,6 +36,7 @@
#include "internal.h"
#include "iostat.h"
#include "fscache.h"
+#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_FILE
@@ -386,6 +387,10 @@ static int nfs_write_begin(struct file *file, struct address_space *mapping,
file->f_path.dentry->d_name.name,
mapping->host->i_ino, len, (long long) pos);
+ pnfs_update_layout(mapping->host,
+ nfs_file_open_context(file),
+ IOMODE_RW);
+
start:
/*
* Prevent starvation issues if someone is doing a consistency
fs/nfs/inode.c
View filediff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 6eec286..314f571 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -48,6 +48,7 @@
#include "internal.h"
#include "fscache.h"
#include "dns_resolve.h"
+#include "pnfs.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@@ -1410,6 +1411,7 @@ void nfs4_evict_inode(struct inode *inode)
{
truncate_inode_pages(&inode->i_data, 0);
end_writeback(inode);
+ pnfs_destroy_layout(NFS_I(inode));
/* If we are holding a delegation, return it! */
nfs_inode_return_delegation_noreclaim(inode);
/* First call standard NFS clear_inode() code */
@@ -1447,6 +1449,7 @@ static inline void nfs4_init_once(struct nfs_inode *nfsi)
nfsi->delegation = NULL;
nfsi->delegation_state = 0;
init_rwsem(&nfsi->rwsem);
+ nfsi->layout = NULL;
#endif
}
fs/nfs/nfs4filelayout.c
View filediff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
new file mode 100644
index 0000000..2e92f0d
--- /dev/null
+++ b/fs/nfs/nfs4filelayout.c
@@ -0,0 +1,280 @@
+/*
+ * Module for the pnfs nfs4 file layout driver.
+ * Defines all I/O and Policy interface operations, plus code
+ * to register itself with the pNFS client.
+ *
+ * Copyright (c) 2002
+ * The Regents of the University of Michigan
+ * All Rights Reserved
+ *
+ * Dean Hildebrand <[email protected]>
+ *
+ * Permission is granted to use, copy, create derivative works, and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the University of Michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization. If
+ * the above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * This software is provided as is, without representation or warranty
+ * of any kind either express or implied, including without limitation
+ * the implied warranties of merchantability, fitness for a particular
+ * purpose, or noninfringement. The Regents of the University of
+ * Michigan shall not be liable for any damages, including special,
+ * indirect, incidental, or consequential damages, with respect to any
+ * claim arising out of or in connection with the use of the software,
+ * even if it has been or is hereafter advised of the possibility of
+ * such damages.
+ */
+
+#include <linux/nfs_fs.h>
+
+#include "internal.h"
+#include "nfs4filelayout.h"
+
+#define NFSDBG_FACILITY NFSDBG_PNFS_LD
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Dean Hildebrand <[email protected]>");
+MODULE_DESCRIPTION("The NFSv4 file layout driver");
+
+static int
+filelayout_set_layoutdriver(struct nfs_server *nfss)
+{
+ int status = pnfs_alloc_init_deviceid_cache(nfss->nfs_client,
+ nfs4_fl_free_deviceid_callback);
+ if (status) {
+ printk(KERN_WARNING "%s: deviceid cache could not be "
+ "initialized\n", __func__);
+ return status;
+ }
+ dprintk("%s: deviceid cache has been initialized successfully\n",
+ __func__);
+ return 0;
+}
+
+/* Clear out the layout by destroying its device list */
+static int
+filelayout_clear_layoutdriver(struct nfs_server *nfss)
+{
+ dprintk("--> %s\n", __func__);
+
+ if (nfss->nfs_client->cl_devid_cache)
+ pnfs_put_deviceid_cache(nfss->nfs_client);
+ return 0;
+}
+
+/*
+ * filelayout_check_layout()
+ *
+ * Make sure layout segment parameters are sane WRT the device.
+ * At this point no generic layer initialization of the lseg has occurred,
+ * and nothing has been added to the layout_hdr cache.
+ *
+ */
+static int
+filelayout_check_layout(struct pnfs_layout_hdr *lo,
+ struct nfs4_filelayout_segment *fl,
+ struct nfs4_layoutget_res *lgr,
+ struct nfs4_deviceid *id)
+{
+ struct nfs4_file_layout_dsaddr *dsaddr;
+ int status = -EINVAL;
+ struct nfs_server *nfss = NFS_SERVER(lo->inode);
+
+ dprintk("--> %s\n", __func__);
+
+ if (fl->pattern_offset > lgr->range.offset) {
+ dprintk("%s pattern_offset %lld to large\n",
+ __func__, fl->pattern_offset);
+ goto out;
+ }
+
+ if (fl->stripe_unit % PAGE_SIZE) {
+ dprintk("%s Stripe unit (%u) not page aligned\n",
+ __func__, fl->stripe_unit);
+ goto out;
+ }
+
+ /* find and reference the deviceid */
+ dsaddr = nfs4_fl_find_get_deviceid(nfss->nfs_client, id);
+ if (dsaddr == NULL) {
+ dsaddr = get_device_info(lo->inode, id);
+ if (dsaddr == NULL)
+ goto out;
+ }
+ fl->dsaddr = dsaddr;
+
+ if (fl->first_stripe_index < 0 ||
+ fl->first_stripe_index >= dsaddr->stripe_count) {
+ dprintk("%s Bad first_stripe_index %d\n",
+ __func__, fl->first_stripe_index);
+ goto out_put;
+ }
+
+ if ((fl->stripe_type == STRIPE_SPARSE &&
+ fl->num_fh > 1 && fl->num_fh != dsaddr->ds_num) ||
+ (fl->stripe_type == STRIPE_DENSE &&
+ fl->num_fh != dsaddr->stripe_count)) {
+ dprintk("%s num_fh %u not valid for given packing\n",
+ __func__, fl->num_fh);
+ goto out_put;
+ }
+
+ if (fl->stripe_unit % nfss->rsize || fl->stripe_unit % nfss->wsize) {
+ dprintk("%s Stripe unit (%u) not aligned with rsize %u "
+ "wsize %u\n", __func__, fl->stripe_unit, nfss->rsize,
+ nfss->wsize);
+ }
+
+ status = 0;
+out:
+ dprintk("--> %s returns %d\n", __func__, status);
+ return status;
+out_put:
+ pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache, &dsaddr->deviceid);
+ goto out;
+}
+
+static void filelayout_free_fh_array(struct nfs4_filelayout_segment *fl)
+{
+ int i;
+
+ for (i = 0; i < fl->num_fh; i++) {
+ if (!fl->fh_array[i])
+ break;
+ kfree(fl->fh_array[i]);
+ }
+ kfree(fl->fh_array);
+ fl->fh_array = NULL;
+}
+
+static void
+_filelayout_free_lseg(struct nfs4_filelayout_segment *fl)
+{
+ filelayout_free_fh_array(fl);
+ kfree(fl);
+}
+
+static int
+filelayout_decode_layout(struct pnfs_layout_hdr *flo,
+ struct nfs4_filelayout_segment *fl,
+ struct nfs4_layoutget_res *lgr,
+ struct nfs4_deviceid *id)
+{
+ uint32_t *p = (uint32_t *)lgr->layout.buf;
+ uint32_t nfl_util;
+ int i;
+
+ dprintk("%s: set_layout_map Begin\n", __func__);
+
+ memcpy(id, p, sizeof(*id));
+ p += XDR_QUADLEN(NFS4_DEVICEID4_SIZE);
+ print_deviceid(id);
+
+ nfl_util = be32_to_cpup(p++);
+ if (nfl_util & NFL4_UFLG_COMMIT_THRU_MDS)
+ fl->commit_through_mds = 1;
+ if (nfl_util & NFL4_UFLG_DENSE)
+ fl->stripe_type = STRIPE_DENSE;
+ else
+ fl->stripe_type = STRIPE_SPARSE;
+ fl->stripe_unit = nfl_util & ~NFL4_UFLG_MASK;
+
+ fl->first_stripe_index = be32_to_cpup(p++);
+ p = xdr_decode_hyper(p, &fl->pattern_offset);
+ fl->num_fh = be32_to_cpup(p++);
+
+ dprintk("%s: nfl_util 0x%X num_fh %u fsi %u po %llu\n",
+ __func__, nfl_util, fl->num_fh, fl->first_stripe_index,
+ fl->pattern_offset);
+
+ fl->fh_array = kzalloc(fl->num_fh * sizeof(struct nfs_fh *),
+ GFP_KERNEL);
+ if (!fl->fh_array)
+ return -ENOMEM;
+
+ for (i = 0; i < fl->num_fh; i++) {
+ /* Do we want to use a mempool here? */
+ fl->fh_array[i] = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
+ if (!fl->fh_array[i]) {
+ filelayout_free_fh_array(fl);
+ return -ENOMEM;
+ }
+ fl->fh_array[i]->size = be32_to_cpup(p++);
+ if (sizeof(struct nfs_fh) < fl->fh_array[i]->size) {
+ printk(KERN_ERR "Too big fh %d received %d\n",
+ i, fl->fh_array[i]->size);
+ filelayout_free_fh_array(fl);
+ return -EIO;
+ }
+ memcpy(fl->fh_array[i]->data, p, fl->fh_array[i]->size);
+ p += XDR_QUADLEN(fl->fh_array[i]->size);
+ dprintk("DEBUG: %s: fh len %d\n", __func__,
+ fl->fh_array[i]->size);
+ }
+
+ return 0;
+}
+
+static struct pnfs_layout_segment *
+filelayout_alloc_lseg(struct pnfs_layout_hdr *layoutid,
+ struct nfs4_layoutget_res *lgr)
+{
+ struct nfs4_filelayout_segment *fl;
+ int rc;
+ struct nfs4_deviceid id;
+
+ dprintk("--> %s\n", __func__);
+ fl = kzalloc(sizeof(*fl), GFP_KERNEL);
+ if (!fl)
+ return NULL;
+
+ rc = filelayout_decode_layout(layoutid, fl, lgr, &id);
+ if (rc != 0 || filelayout_check_layout(layoutid, fl, lgr, &id)) {
+ _filelayout_free_lseg(fl);
+ return NULL;
+ }
+ return &fl->generic_hdr;
+}
+
+static void
+filelayout_free_lseg(struct pnfs_layout_segment *lseg)
+{
+ struct nfs_server *nfss = NFS_SERVER(lseg->layout->inode);
+ struct nfs4_filelayout_segment *fl = FILELAYOUT_LSEG(lseg);
+
+ dprintk("--> %s\n", __func__);
+ pnfs_put_deviceid(nfss->nfs_client->cl_devid_cache,
+ &fl->dsaddr->deviceid);
+ _filelayout_free_lseg(fl);
+}
+
+static struct pnfs_layoutdriver_type filelayout_type = {
+ .id = LAYOUT_NFSV4_1_FILES,
+ .name = "LAYOUT_NFSV4_1_FILES",
+ .owner = THIS_MODULE,
+ .set_layoutdriver = filelayout_set_layoutdriver,
+ .clear_layoutdriver = filelayout_clear_layoutdriver,
+ .alloc_lseg = filelayout_alloc_lseg,
+ .free_lseg = filelayout_free_lseg,
+};
+
+static int __init nfs4filelayout_init(void)
+{
+ printk(KERN_INFO "%s: NFSv4 File Layout Driver Registering...\n",
+ __func__);
+ return pnfs_register_layoutdriver(&filelayout_type);
+}
+
+static void __exit nfs4filelayout_exit(void)
+{
+ printk(KERN_INFO "%s: NFSv4 File Layout Driver Unregistering...\n",
+ __func__);
+ pnfs_unregister_layoutdriver(&filelayout_type);
+}
+
+module_init(nfs4filelayout_init);
+module_exit(nfs4filelayout_exit);
fs/nfs/nfs4filelayout.h
View filediff --git a/fs/nfs/nfs4filelayout.h b/fs/nfs/nfs4filelayout.h
new file mode 100644
index 0000000..bbf60dd
--- /dev/null
+++ b/fs/nfs/nfs4filelayout.h
@@ -0,0 +1,94 @@
+/*
+ * NFSv4 file layout driver data structures.
+ *
+ * Copyright (c) 2002
+ * The Regents of the University of Michigan
+ * All Rights Reserved
+ *
+ * Dean Hildebrand <[email protected]>
+ *
+ * Permission is granted to use, copy, create derivative works, and
+ * redistribute this software and such derivative works for any purpose,
+ * so long as the name of the University of Michigan is not used in
+ * any advertising or publicity pertaining to the use or distribution
+ * of this software without specific, written prior authorization. If
+ * the above copyright notice or any other identification of the
+ * University of Michigan is included in any copy of any portion of
+ * this software, then the disclaimer below must also be included.
+ *
+ * This software is provided as is, without representation or warranty
+ * of any kind either express or implied, including without limitation
+ * the implied warranties of merchantability, fitness for a particular
+ * purpose, or noninfringement. The Regents of the University of
+ * Michigan shall not be liable for any damages, including special,
+ * indirect, incidental, or consequential damages, with respect to any
+ * claim arising out of or in connection with the use of the software,
+ * even if it has been or is hereafter advised of the possibility of
+ * such damages.
+ */
+
+#ifndef FS_NFS_NFS4FILELAYOUT_H
+#define FS_NFS_NFS4FILELAYOUT_H
+
+#include "pnfs.h"
+
+/*
+ * Field testing shows we need to support upto 4096 stripe indices.
+ * We store each index as a u8 (u32 on the wire) to keep the memory footprint
+ * reasonable. This in turn means we support a maximum of 256
+ * RFC 5661 multipath_list4 structures.
+ */
+#define NFS4_PNFS_MAX_STRIPE_CNT 4096
+#define NFS4_PNFS_MAX_MULTI_CNT 256 /* 256 fit into a u8 stripe_index */
+
+enum stripetype4 {
+ STRIPE_SPARSE = 1,
+ STRIPE_DENSE = 2
+};
+
+/* Individual ip address */
+struct nfs4_pnfs_ds {
+ struct list_head ds_node; /* nfs4_pnfs_dev_hlist dev_dslist */
+ u32 ds_ip_addr;
+ u32 ds_port;
+ struct nfs_client *ds_clp;
+ atomic_t ds_count;
+};
+
+struct nfs4_file_layout_dsaddr {
+ struct pnfs_deviceid_node deviceid;
+ u32 stripe_count;
+ u8 *stripe_indices;
+ u32 ds_num;
+ struct nfs4_pnfs_ds *ds_list[1];
+};
+
+struct nfs4_filelayout_segment {
+ struct pnfs_layout_segment generic_hdr;
+ u32 stripe_type;
+ u32 commit_through_mds;
+ u32 stripe_unit;
+ u32 first_stripe_index;
+ u64 pattern_offset;
+ struct nfs4_file_layout_dsaddr *dsaddr; /* Point to GETDEVINFO data */
+ unsigned int num_fh;
+ struct nfs_fh **fh_array;
+};
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fs/nfs/nfs4filelayoutdev.c
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fs/nfs/nfs4proc.c
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fs/nfs/nfs4state.c
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fs/nfs/nfs4xdr.c
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fs/nfs/pnfs.c
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fs/nfs/pnfs.h
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fs/nfs/read.c
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fs/nfsd/nfs4callback.c
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include/linux/nfs4.h
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include/linux/nfs_fs.h
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include/linux/nfs_fs_sb.h
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include/linux/nfs_xdr.h
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include/linux/sunrpc/xdr.h
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net/sunrpc/auth_gss/gss_krb5_mech.c
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