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1411 lines
37 KiB
1411 lines
37 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/fs/nfs/super.c |
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* |
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* Copyright (C) 1992 Rick Sladkey |
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* |
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* nfs superblock handling functions |
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* |
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* Modularised by Alan Cox <[email protected]>, while hacking some |
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* experimental NFS changes. Modularisation taken straight from SYS5 fs. |
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* |
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* Change to nfs_read_super() to permit NFS mounts to multi-homed hosts. |
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* [email protected] |
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* |
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* Split from inode.c by David Howells <[email protected]> |
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* |
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* - superblocks are indexed on server only - all inodes, dentries, etc. associated with a |
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* particular server are held in the same superblock |
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* - NFS superblocks can have several effective roots to the dentry tree |
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* - directory type roots are spliced into the tree when a path from one root reaches the root |
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* of another (see nfs_lookup()) |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/init.h> |
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|
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#include <linux/time.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/string.h> |
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#include <linux/stat.h> |
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#include <linux/errno.h> |
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#include <linux/unistd.h> |
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#include <linux/sunrpc/clnt.h> |
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#include <linux/sunrpc/addr.h> |
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#include <linux/sunrpc/stats.h> |
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#include <linux/sunrpc/metrics.h> |
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#include <linux/sunrpc/xprtsock.h> |
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#include <linux/sunrpc/xprtrdma.h> |
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#include <linux/nfs_fs.h> |
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#include <linux/nfs_mount.h> |
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#include <linux/nfs4_mount.h> |
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#include <linux/lockd/bind.h> |
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#include <linux/seq_file.h> |
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#include <linux/mount.h> |
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#include <linux/namei.h> |
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#include <linux/vfs.h> |
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#include <linux/inet.h> |
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#include <linux/in6.h> |
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#include <linux/slab.h> |
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#include <net/ipv6.h> |
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#include <linux/netdevice.h> |
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#include <linux/nfs_xdr.h> |
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#include <linux/magic.h> |
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#include <linux/parser.h> |
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#include <linux/nsproxy.h> |
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#include <linux/rcupdate.h> |
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|
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#include <linux/uaccess.h> |
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#include <linux/nfs_ssc.h> |
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|
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#include "nfs4_fs.h" |
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#include "callback.h" |
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#include "delegation.h" |
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#include "iostat.h" |
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#include "internal.h" |
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#include "fscache.h" |
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#include "nfs4session.h" |
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#include "pnfs.h" |
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#include "nfs.h" |
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|
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#define NFSDBG_FACILITY NFSDBG_VFS |
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|
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const struct super_operations nfs_sops = { |
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.alloc_inode = nfs_alloc_inode, |
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.free_inode = nfs_free_inode, |
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.write_inode = nfs_write_inode, |
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.drop_inode = nfs_drop_inode, |
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.statfs = nfs_statfs, |
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.evict_inode = nfs_evict_inode, |
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.umount_begin = nfs_umount_begin, |
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.show_options = nfs_show_options, |
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.show_devname = nfs_show_devname, |
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.show_path = nfs_show_path, |
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.show_stats = nfs_show_stats, |
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}; |
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EXPORT_SYMBOL_GPL(nfs_sops); |
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|
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#ifdef CONFIG_NFS_V4_2 |
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static const struct nfs_ssc_client_ops nfs_ssc_clnt_ops_tbl = { |
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.sco_sb_deactive = nfs_sb_deactive, |
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}; |
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#endif |
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|
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#if IS_ENABLED(CONFIG_NFS_V4) |
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static int __init register_nfs4_fs(void) |
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{ |
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return register_filesystem(&nfs4_fs_type); |
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} |
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|
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static void unregister_nfs4_fs(void) |
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{ |
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unregister_filesystem(&nfs4_fs_type); |
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} |
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#else |
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static int __init register_nfs4_fs(void) |
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{ |
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return 0; |
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} |
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|
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static void unregister_nfs4_fs(void) |
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{ |
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} |
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#endif |
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|
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#ifdef CONFIG_NFS_V4_2 |
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static void nfs_ssc_register_ops(void) |
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{ |
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#ifdef CONFIG_NFSD_V4 |
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nfs_ssc_register(&nfs_ssc_clnt_ops_tbl); |
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#endif |
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} |
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|
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static void nfs_ssc_unregister_ops(void) |
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{ |
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#ifdef CONFIG_NFSD_V4 |
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nfs_ssc_unregister(&nfs_ssc_clnt_ops_tbl); |
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#endif |
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} |
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#endif /* CONFIG_NFS_V4_2 */ |
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|
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static struct shrinker acl_shrinker = { |
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.count_objects = nfs_access_cache_count, |
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.scan_objects = nfs_access_cache_scan, |
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.seeks = DEFAULT_SEEKS, |
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}; |
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|
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/* |
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* Register the NFS filesystems |
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*/ |
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int __init register_nfs_fs(void) |
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{ |
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int ret; |
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|
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ret = register_filesystem(&nfs_fs_type); |
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if (ret < 0) |
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goto error_0; |
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|
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ret = register_nfs4_fs(); |
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if (ret < 0) |
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goto error_1; |
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|
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ret = nfs_register_sysctl(); |
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if (ret < 0) |
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goto error_2; |
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ret = register_shrinker(&acl_shrinker); |
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if (ret < 0) |
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goto error_3; |
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#ifdef CONFIG_NFS_V4_2 |
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nfs_ssc_register_ops(); |
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#endif |
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return 0; |
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error_3: |
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nfs_unregister_sysctl(); |
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error_2: |
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unregister_nfs4_fs(); |
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error_1: |
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unregister_filesystem(&nfs_fs_type); |
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error_0: |
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return ret; |
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} |
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|
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/* |
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* Unregister the NFS filesystems |
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*/ |
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void __exit unregister_nfs_fs(void) |
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{ |
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unregister_shrinker(&acl_shrinker); |
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nfs_unregister_sysctl(); |
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unregister_nfs4_fs(); |
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#ifdef CONFIG_NFS_V4_2 |
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nfs_ssc_unregister_ops(); |
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#endif |
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unregister_filesystem(&nfs_fs_type); |
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} |
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|
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bool nfs_sb_active(struct super_block *sb) |
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{ |
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struct nfs_server *server = NFS_SB(sb); |
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|
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if (!atomic_inc_not_zero(&sb->s_active)) |
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return false; |
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if (atomic_inc_return(&server->active) != 1) |
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atomic_dec(&sb->s_active); |
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return true; |
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} |
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EXPORT_SYMBOL_GPL(nfs_sb_active); |
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|
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void nfs_sb_deactive(struct super_block *sb) |
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{ |
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struct nfs_server *server = NFS_SB(sb); |
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|
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if (atomic_dec_and_test(&server->active)) |
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deactivate_super(sb); |
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} |
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EXPORT_SYMBOL_GPL(nfs_sb_deactive); |
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|
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static int __nfs_list_for_each_server(struct list_head *head, |
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int (*fn)(struct nfs_server *, void *), |
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void *data) |
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{ |
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struct nfs_server *server, *last = NULL; |
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int ret = 0; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(server, head, client_link) { |
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if (!(server->super && nfs_sb_active(server->super))) |
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continue; |
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rcu_read_unlock(); |
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if (last) |
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nfs_sb_deactive(last->super); |
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last = server; |
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ret = fn(server, data); |
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if (ret) |
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goto out; |
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rcu_read_lock(); |
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} |
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rcu_read_unlock(); |
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out: |
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if (last) |
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nfs_sb_deactive(last->super); |
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return ret; |
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} |
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int nfs_client_for_each_server(struct nfs_client *clp, |
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int (*fn)(struct nfs_server *, void *), |
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void *data) |
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{ |
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return __nfs_list_for_each_server(&clp->cl_superblocks, fn, data); |
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} |
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EXPORT_SYMBOL_GPL(nfs_client_for_each_server); |
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|
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/* |
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* Deliver file system statistics to userspace |
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*/ |
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int nfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
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{ |
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struct nfs_server *server = NFS_SB(dentry->d_sb); |
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unsigned char blockbits; |
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unsigned long blockres; |
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struct nfs_fh *fh = NFS_FH(d_inode(dentry)); |
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struct nfs_fsstat res; |
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int error = -ENOMEM; |
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res.fattr = nfs_alloc_fattr(); |
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if (res.fattr == NULL) |
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goto out_err; |
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error = server->nfs_client->rpc_ops->statfs(server, fh, &res); |
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if (unlikely(error == -ESTALE)) { |
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struct dentry *pd_dentry; |
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pd_dentry = dget_parent(dentry); |
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nfs_zap_caches(d_inode(pd_dentry)); |
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dput(pd_dentry); |
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} |
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nfs_free_fattr(res.fattr); |
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if (error < 0) |
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goto out_err; |
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buf->f_type = NFS_SUPER_MAGIC; |
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|
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/* |
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* Current versions of glibc do not correctly handle the |
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* case where f_frsize != f_bsize. Eventually we want to |
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* report the value of wtmult in this field. |
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*/ |
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buf->f_frsize = dentry->d_sb->s_blocksize; |
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|
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/* |
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* On most *nix systems, f_blocks, f_bfree, and f_bavail |
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* are reported in units of f_frsize. Linux hasn't had |
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* an f_frsize field in its statfs struct until recently, |
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* thus historically Linux's sys_statfs reports these |
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* fields in units of f_bsize. |
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*/ |
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buf->f_bsize = dentry->d_sb->s_blocksize; |
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blockbits = dentry->d_sb->s_blocksize_bits; |
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blockres = (1 << blockbits) - 1; |
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buf->f_blocks = (res.tbytes + blockres) >> blockbits; |
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buf->f_bfree = (res.fbytes + blockres) >> blockbits; |
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buf->f_bavail = (res.abytes + blockres) >> blockbits; |
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buf->f_files = res.tfiles; |
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buf->f_ffree = res.afiles; |
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buf->f_namelen = server->namelen; |
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return 0; |
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out_err: |
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dprintk("%s: statfs error = %d\n", __func__, -error); |
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return error; |
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} |
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EXPORT_SYMBOL_GPL(nfs_statfs); |
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|
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/* |
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* Map the security flavour number to a name |
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*/ |
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static const char *nfs_pseudoflavour_to_name(rpc_authflavor_t flavour) |
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{ |
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static const struct { |
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rpc_authflavor_t flavour; |
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const char *str; |
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} sec_flavours[NFS_AUTH_INFO_MAX_FLAVORS] = { |
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/* update NFS_AUTH_INFO_MAX_FLAVORS when this list changes! */ |
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{ RPC_AUTH_NULL, "null" }, |
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{ RPC_AUTH_UNIX, "sys" }, |
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{ RPC_AUTH_GSS_KRB5, "krb5" }, |
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{ RPC_AUTH_GSS_KRB5I, "krb5i" }, |
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{ RPC_AUTH_GSS_KRB5P, "krb5p" }, |
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{ RPC_AUTH_GSS_LKEY, "lkey" }, |
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{ RPC_AUTH_GSS_LKEYI, "lkeyi" }, |
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{ RPC_AUTH_GSS_LKEYP, "lkeyp" }, |
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{ RPC_AUTH_GSS_SPKM, "spkm" }, |
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{ RPC_AUTH_GSS_SPKMI, "spkmi" }, |
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{ RPC_AUTH_GSS_SPKMP, "spkmp" }, |
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{ UINT_MAX, "unknown" } |
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}; |
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int i; |
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for (i = 0; sec_flavours[i].flavour != UINT_MAX; i++) { |
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if (sec_flavours[i].flavour == flavour) |
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break; |
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} |
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return sec_flavours[i].str; |
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} |
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static void nfs_show_mountd_netid(struct seq_file *m, struct nfs_server *nfss, |
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int showdefaults) |
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{ |
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struct sockaddr *sap = (struct sockaddr *) &nfss->mountd_address; |
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char *proto = NULL; |
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|
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switch (sap->sa_family) { |
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case AF_INET: |
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switch (nfss->mountd_protocol) { |
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case IPPROTO_UDP: |
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proto = RPCBIND_NETID_UDP; |
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break; |
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case IPPROTO_TCP: |
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proto = RPCBIND_NETID_TCP; |
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break; |
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} |
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break; |
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case AF_INET6: |
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switch (nfss->mountd_protocol) { |
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case IPPROTO_UDP: |
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proto = RPCBIND_NETID_UDP6; |
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break; |
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case IPPROTO_TCP: |
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proto = RPCBIND_NETID_TCP6; |
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break; |
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} |
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break; |
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} |
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if (proto || showdefaults) |
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seq_printf(m, ",mountproto=%s", proto ?: "auto"); |
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} |
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|
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static void nfs_show_mountd_options(struct seq_file *m, struct nfs_server *nfss, |
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int showdefaults) |
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{ |
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struct sockaddr *sap = (struct sockaddr *)&nfss->mountd_address; |
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|
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if (nfss->flags & NFS_MOUNT_LEGACY_INTERFACE) |
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return; |
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|
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switch (sap->sa_family) { |
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case AF_INET: { |
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struct sockaddr_in *sin = (struct sockaddr_in *)sap; |
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seq_printf(m, ",mountaddr=%pI4", &sin->sin_addr.s_addr); |
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break; |
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} |
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case AF_INET6: { |
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sap; |
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seq_printf(m, ",mountaddr=%pI6c", &sin6->sin6_addr); |
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break; |
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} |
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default: |
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if (showdefaults) |
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seq_puts(m, ",mountaddr=unspecified"); |
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} |
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|
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if (nfss->mountd_version || showdefaults) |
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seq_printf(m, ",mountvers=%u", nfss->mountd_version); |
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if ((nfss->mountd_port && |
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nfss->mountd_port != (unsigned short)NFS_UNSPEC_PORT) || |
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showdefaults) |
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seq_printf(m, ",mountport=%u", nfss->mountd_port); |
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|
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nfs_show_mountd_netid(m, nfss, showdefaults); |
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} |
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|
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#if IS_ENABLED(CONFIG_NFS_V4) |
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static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, |
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int showdefaults) |
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{ |
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struct nfs_client *clp = nfss->nfs_client; |
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|
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seq_printf(m, ",clientaddr=%s", clp->cl_ipaddr); |
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} |
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#else |
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static void nfs_show_nfsv4_options(struct seq_file *m, struct nfs_server *nfss, |
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int showdefaults) |
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{ |
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} |
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#endif |
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|
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static void nfs_show_nfs_version(struct seq_file *m, |
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unsigned int version, |
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unsigned int minorversion) |
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{ |
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seq_printf(m, ",vers=%u", version); |
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if (version == 4) |
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seq_printf(m, ".%u", minorversion); |
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} |
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|
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/* |
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* Describe the mount options in force on this server representation |
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*/ |
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static void nfs_show_mount_options(struct seq_file *m, struct nfs_server *nfss, |
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int showdefaults) |
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{ |
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static const struct proc_nfs_info { |
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int flag; |
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const char *str; |
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const char *nostr; |
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} nfs_info[] = { |
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{ NFS_MOUNT_SOFT, ",soft", "" }, |
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{ NFS_MOUNT_SOFTERR, ",softerr", "" }, |
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{ NFS_MOUNT_SOFTREVAL, ",softreval", "" }, |
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{ NFS_MOUNT_POSIX, ",posix", "" }, |
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{ NFS_MOUNT_NOCTO, ",nocto", "" }, |
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{ NFS_MOUNT_NOAC, ",noac", "" }, |
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{ NFS_MOUNT_NONLM, ",nolock", "" }, |
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{ NFS_MOUNT_NOACL, ",noacl", "" }, |
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{ NFS_MOUNT_NORDIRPLUS, ",nordirplus", "" }, |
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{ NFS_MOUNT_UNSHARED, ",nosharecache", "" }, |
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{ NFS_MOUNT_NORESVPORT, ",noresvport", "" }, |
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{ 0, NULL, NULL } |
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}; |
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const struct proc_nfs_info *nfs_infop; |
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struct nfs_client *clp = nfss->nfs_client; |
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u32 version = clp->rpc_ops->version; |
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int local_flock, local_fcntl; |
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|
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nfs_show_nfs_version(m, version, clp->cl_minorversion); |
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seq_printf(m, ",rsize=%u", nfss->rsize); |
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seq_printf(m, ",wsize=%u", nfss->wsize); |
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if (nfss->bsize != 0) |
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seq_printf(m, ",bsize=%u", nfss->bsize); |
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seq_printf(m, ",namlen=%u", nfss->namelen); |
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if (nfss->acregmin != NFS_DEF_ACREGMIN*HZ || showdefaults) |
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seq_printf(m, ",acregmin=%u", nfss->acregmin/HZ); |
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if (nfss->acregmax != NFS_DEF_ACREGMAX*HZ || showdefaults) |
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seq_printf(m, ",acregmax=%u", nfss->acregmax/HZ); |
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if (nfss->acdirmin != NFS_DEF_ACDIRMIN*HZ || showdefaults) |
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seq_printf(m, ",acdirmin=%u", nfss->acdirmin/HZ); |
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if (nfss->acdirmax != NFS_DEF_ACDIRMAX*HZ || showdefaults) |
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seq_printf(m, ",acdirmax=%u", nfss->acdirmax/HZ); |
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if (!(nfss->flags & (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))) |
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seq_puts(m, ",hard"); |
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for (nfs_infop = nfs_info; nfs_infop->flag; nfs_infop++) { |
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if (nfss->flags & nfs_infop->flag) |
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seq_puts(m, nfs_infop->str); |
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else |
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seq_puts(m, nfs_infop->nostr); |
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} |
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rcu_read_lock(); |
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seq_printf(m, ",proto=%s", |
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rpc_peeraddr2str(nfss->client, RPC_DISPLAY_NETID)); |
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rcu_read_unlock(); |
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if (clp->cl_nconnect > 0) |
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seq_printf(m, ",nconnect=%u", clp->cl_nconnect); |
|
if (version == 4) { |
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if (nfss->port != NFS_PORT) |
|
seq_printf(m, ",port=%u", nfss->port); |
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} else |
|
if (nfss->port) |
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seq_printf(m, ",port=%u", nfss->port); |
|
|
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seq_printf(m, ",timeo=%lu", 10U * nfss->client->cl_timeout->to_initval / HZ); |
|
seq_printf(m, ",retrans=%u", nfss->client->cl_timeout->to_retries); |
|
seq_printf(m, ",sec=%s", nfs_pseudoflavour_to_name(nfss->client->cl_auth->au_flavor)); |
|
|
|
if (version != 4) |
|
nfs_show_mountd_options(m, nfss, showdefaults); |
|
else |
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nfs_show_nfsv4_options(m, nfss, showdefaults); |
|
|
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if (nfss->options & NFS_OPTION_FSCACHE) |
|
seq_puts(m, ",fsc"); |
|
|
|
if (nfss->options & NFS_OPTION_MIGRATION) |
|
seq_puts(m, ",migration"); |
|
|
|
if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) { |
|
if (nfss->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) |
|
seq_puts(m, ",lookupcache=none"); |
|
else |
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seq_puts(m, ",lookupcache=pos"); |
|
} |
|
|
|
local_flock = nfss->flags & NFS_MOUNT_LOCAL_FLOCK; |
|
local_fcntl = nfss->flags & NFS_MOUNT_LOCAL_FCNTL; |
|
|
|
if (!local_flock && !local_fcntl) |
|
seq_puts(m, ",local_lock=none"); |
|
else if (local_flock && local_fcntl) |
|
seq_puts(m, ",local_lock=all"); |
|
else if (local_flock) |
|
seq_puts(m, ",local_lock=flock"); |
|
else |
|
seq_puts(m, ",local_lock=posix"); |
|
|
|
if (nfss->flags & NFS_MOUNT_WRITE_EAGER) { |
|
if (nfss->flags & NFS_MOUNT_WRITE_WAIT) |
|
seq_puts(m, ",write=wait"); |
|
else |
|
seq_puts(m, ",write=eager"); |
|
} |
|
} |
|
|
|
/* |
|
* Describe the mount options on this VFS mountpoint |
|
*/ |
|
int nfs_show_options(struct seq_file *m, struct dentry *root) |
|
{ |
|
struct nfs_server *nfss = NFS_SB(root->d_sb); |
|
|
|
nfs_show_mount_options(m, nfss, 0); |
|
|
|
rcu_read_lock(); |
|
seq_printf(m, ",addr=%s", |
|
rpc_peeraddr2str(nfss->nfs_client->cl_rpcclient, |
|
RPC_DISPLAY_ADDR)); |
|
rcu_read_unlock(); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_show_options); |
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
static void show_lease(struct seq_file *m, struct nfs_server *server) |
|
{ |
|
struct nfs_client *clp = server->nfs_client; |
|
unsigned long expire; |
|
|
|
seq_printf(m, ",lease_time=%ld", clp->cl_lease_time / HZ); |
|
expire = clp->cl_last_renewal + clp->cl_lease_time; |
|
seq_printf(m, ",lease_expired=%ld", |
|
time_after(expire, jiffies) ? 0 : (jiffies - expire) / HZ); |
|
} |
|
#ifdef CONFIG_NFS_V4_1 |
|
static void show_sessions(struct seq_file *m, struct nfs_server *server) |
|
{ |
|
if (nfs4_has_session(server->nfs_client)) |
|
seq_puts(m, ",sessions"); |
|
} |
|
#else |
|
static void show_sessions(struct seq_file *m, struct nfs_server *server) {} |
|
#endif |
|
#endif |
|
|
|
#ifdef CONFIG_NFS_V4_1 |
|
static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
|
{ |
|
seq_printf(m, ",pnfs="); |
|
if (server->pnfs_curr_ld) |
|
seq_printf(m, "%s", server->pnfs_curr_ld->name); |
|
else |
|
seq_printf(m, "not configured"); |
|
} |
|
|
|
static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
|
{ |
|
if (nfss->nfs_client && nfss->nfs_client->cl_implid) { |
|
struct nfs41_impl_id *impl_id = nfss->nfs_client->cl_implid; |
|
seq_printf(m, "\n\timpl_id:\tname='%s',domain='%s'," |
|
"date='%llu,%u'", |
|
impl_id->name, impl_id->domain, |
|
impl_id->date.seconds, impl_id->date.nseconds); |
|
} |
|
} |
|
#else |
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
static void show_pnfs(struct seq_file *m, struct nfs_server *server) |
|
{ |
|
} |
|
#endif |
|
static void show_implementation_id(struct seq_file *m, struct nfs_server *nfss) |
|
{ |
|
} |
|
#endif |
|
|
|
int nfs_show_devname(struct seq_file *m, struct dentry *root) |
|
{ |
|
char *page = (char *) __get_free_page(GFP_KERNEL); |
|
char *devname, *dummy; |
|
int err = 0; |
|
if (!page) |
|
return -ENOMEM; |
|
devname = nfs_path(&dummy, root, page, PAGE_SIZE, 0); |
|
if (IS_ERR(devname)) |
|
err = PTR_ERR(devname); |
|
else |
|
seq_escape(m, devname, " \t\n\\"); |
|
free_page((unsigned long)page); |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_show_devname); |
|
|
|
int nfs_show_path(struct seq_file *m, struct dentry *dentry) |
|
{ |
|
seq_puts(m, "/"); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_show_path); |
|
|
|
/* |
|
* Present statistical information for this VFS mountpoint |
|
*/ |
|
int nfs_show_stats(struct seq_file *m, struct dentry *root) |
|
{ |
|
int i, cpu; |
|
struct nfs_server *nfss = NFS_SB(root->d_sb); |
|
struct rpc_auth *auth = nfss->client->cl_auth; |
|
struct nfs_iostats totals = { }; |
|
|
|
seq_printf(m, "statvers=%s", NFS_IOSTAT_VERS); |
|
|
|
/* |
|
* Display all mount option settings |
|
*/ |
|
seq_puts(m, "\n\topts:\t"); |
|
seq_puts(m, sb_rdonly(root->d_sb) ? "ro" : "rw"); |
|
seq_puts(m, root->d_sb->s_flags & SB_SYNCHRONOUS ? ",sync" : ""); |
|
seq_puts(m, root->d_sb->s_flags & SB_NOATIME ? ",noatime" : ""); |
|
seq_puts(m, root->d_sb->s_flags & SB_NODIRATIME ? ",nodiratime" : ""); |
|
nfs_show_mount_options(m, nfss, 1); |
|
|
|
seq_printf(m, "\n\tage:\t%lu", (jiffies - nfss->mount_time) / HZ); |
|
|
|
show_implementation_id(m, nfss); |
|
|
|
seq_puts(m, "\n\tcaps:\t"); |
|
seq_printf(m, "caps=0x%x", nfss->caps); |
|
seq_printf(m, ",wtmult=%u", nfss->wtmult); |
|
seq_printf(m, ",dtsize=%u", nfss->dtsize); |
|
seq_printf(m, ",bsize=%u", nfss->bsize); |
|
seq_printf(m, ",namlen=%u", nfss->namelen); |
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
if (nfss->nfs_client->rpc_ops->version == 4) { |
|
seq_puts(m, "\n\tnfsv4:\t"); |
|
seq_printf(m, "bm0=0x%x", nfss->attr_bitmask[0]); |
|
seq_printf(m, ",bm1=0x%x", nfss->attr_bitmask[1]); |
|
seq_printf(m, ",bm2=0x%x", nfss->attr_bitmask[2]); |
|
seq_printf(m, ",acl=0x%x", nfss->acl_bitmask); |
|
show_sessions(m, nfss); |
|
show_pnfs(m, nfss); |
|
show_lease(m, nfss); |
|
} |
|
#endif |
|
|
|
/* |
|
* Display security flavor in effect for this mount |
|
*/ |
|
seq_printf(m, "\n\tsec:\tflavor=%u", auth->au_ops->au_flavor); |
|
if (auth->au_flavor) |
|
seq_printf(m, ",pseudoflavor=%u", auth->au_flavor); |
|
|
|
/* |
|
* Display superblock I/O counters |
|
*/ |
|
for_each_possible_cpu(cpu) { |
|
struct nfs_iostats *stats; |
|
|
|
preempt_disable(); |
|
stats = per_cpu_ptr(nfss->io_stats, cpu); |
|
|
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++) |
|
totals.events[i] += stats->events[i]; |
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++) |
|
totals.bytes[i] += stats->bytes[i]; |
|
#ifdef CONFIG_NFS_FSCACHE |
|
for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) |
|
totals.fscache[i] += stats->fscache[i]; |
|
#endif |
|
|
|
preempt_enable(); |
|
} |
|
|
|
seq_puts(m, "\n\tevents:\t"); |
|
for (i = 0; i < __NFSIOS_COUNTSMAX; i++) |
|
seq_printf(m, "%lu ", totals.events[i]); |
|
seq_puts(m, "\n\tbytes:\t"); |
|
for (i = 0; i < __NFSIOS_BYTESMAX; i++) |
|
seq_printf(m, "%Lu ", totals.bytes[i]); |
|
#ifdef CONFIG_NFS_FSCACHE |
|
if (nfss->options & NFS_OPTION_FSCACHE) { |
|
seq_puts(m, "\n\tfsc:\t"); |
|
for (i = 0; i < __NFSIOS_FSCACHEMAX; i++) |
|
seq_printf(m, "%Lu ", totals.fscache[i]); |
|
} |
|
#endif |
|
seq_putc(m, '\n'); |
|
|
|
rpc_clnt_show_stats(m, nfss->client); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_show_stats); |
|
|
|
/* |
|
* Begin unmount by attempting to remove all automounted mountpoints we added |
|
* in response to xdev traversals and referrals |
|
*/ |
|
void nfs_umount_begin(struct super_block *sb) |
|
{ |
|
struct nfs_server *server; |
|
struct rpc_clnt *rpc; |
|
|
|
server = NFS_SB(sb); |
|
/* -EIO all pending I/O */ |
|
rpc = server->client_acl; |
|
if (!IS_ERR(rpc)) |
|
rpc_killall_tasks(rpc); |
|
rpc = server->client; |
|
if (!IS_ERR(rpc)) |
|
rpc_killall_tasks(rpc); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_umount_begin); |
|
|
|
/* |
|
* Return true if 'match' is in auth_info or auth_info is empty. |
|
* Return false otherwise. |
|
*/ |
|
bool nfs_auth_info_match(const struct nfs_auth_info *auth_info, |
|
rpc_authflavor_t match) |
|
{ |
|
int i; |
|
|
|
if (!auth_info->flavor_len) |
|
return true; |
|
|
|
for (i = 0; i < auth_info->flavor_len; i++) { |
|
if (auth_info->flavors[i] == match) |
|
return true; |
|
} |
|
return false; |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_auth_info_match); |
|
|
|
/* |
|
* Ensure that a specified authtype in ctx->auth_info is supported by |
|
* the server. Returns 0 and sets ctx->selected_flavor if it's ok, and |
|
* -EACCES if not. |
|
*/ |
|
static int nfs_verify_authflavors(struct nfs_fs_context *ctx, |
|
rpc_authflavor_t *server_authlist, |
|
unsigned int count) |
|
{ |
|
rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR; |
|
bool found_auth_null = false; |
|
unsigned int i; |
|
|
|
/* |
|
* If the sec= mount option is used, the specified flavor or AUTH_NULL |
|
* must be in the list returned by the server. |
|
* |
|
* AUTH_NULL has a special meaning when it's in the server list - it |
|
* means that the server will ignore the rpc creds, so any flavor |
|
* can be used but still use the sec= that was specified. |
|
* |
|
* Note also that the MNT procedure in MNTv1 does not return a list |
|
* of supported security flavors. In this case, nfs_mount() fabricates |
|
* a security flavor list containing just AUTH_NULL. |
|
*/ |
|
for (i = 0; i < count; i++) { |
|
flavor = server_authlist[i]; |
|
|
|
if (nfs_auth_info_match(&ctx->auth_info, flavor)) |
|
goto out; |
|
|
|
if (flavor == RPC_AUTH_NULL) |
|
found_auth_null = true; |
|
} |
|
|
|
if (found_auth_null) { |
|
flavor = ctx->auth_info.flavors[0]; |
|
goto out; |
|
} |
|
|
|
dfprintk(MOUNT, |
|
"NFS: specified auth flavors not supported by server\n"); |
|
return -EACCES; |
|
|
|
out: |
|
ctx->selected_flavor = flavor; |
|
dfprintk(MOUNT, "NFS: using auth flavor %u\n", ctx->selected_flavor); |
|
return 0; |
|
} |
|
|
|
/* |
|
* Use the remote server's MOUNT service to request the NFS file handle |
|
* corresponding to the provided path. |
|
*/ |
|
static int nfs_request_mount(struct fs_context *fc, |
|
struct nfs_fh *root_fh, |
|
rpc_authflavor_t *server_authlist, |
|
unsigned int *server_authlist_len) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
struct nfs_mount_request request = { |
|
.sap = (struct sockaddr *) |
|
&ctx->mount_server.address, |
|
.dirpath = ctx->nfs_server.export_path, |
|
.protocol = ctx->mount_server.protocol, |
|
.fh = root_fh, |
|
.noresvport = ctx->flags & NFS_MOUNT_NORESVPORT, |
|
.auth_flav_len = server_authlist_len, |
|
.auth_flavs = server_authlist, |
|
.net = fc->net_ns, |
|
}; |
|
int status; |
|
|
|
if (ctx->mount_server.version == 0) { |
|
switch (ctx->version) { |
|
default: |
|
ctx->mount_server.version = NFS_MNT3_VERSION; |
|
break; |
|
case 2: |
|
ctx->mount_server.version = NFS_MNT_VERSION; |
|
} |
|
} |
|
request.version = ctx->mount_server.version; |
|
|
|
if (ctx->mount_server.hostname) |
|
request.hostname = ctx->mount_server.hostname; |
|
else |
|
request.hostname = ctx->nfs_server.hostname; |
|
|
|
/* |
|
* Construct the mount server's address. |
|
*/ |
|
if (ctx->mount_server.address.sa_family == AF_UNSPEC) { |
|
memcpy(request.sap, &ctx->nfs_server.address, |
|
ctx->nfs_server.addrlen); |
|
ctx->mount_server.addrlen = ctx->nfs_server.addrlen; |
|
} |
|
request.salen = ctx->mount_server.addrlen; |
|
nfs_set_port(request.sap, &ctx->mount_server.port, 0); |
|
|
|
/* |
|
* Now ask the mount server to map our export path |
|
* to a file handle. |
|
*/ |
|
status = nfs_mount(&request); |
|
if (status != 0) { |
|
dfprintk(MOUNT, "NFS: unable to mount server %s, error %d\n", |
|
request.hostname, status); |
|
return status; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct nfs_server *nfs_try_mount_request(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
int status; |
|
unsigned int i; |
|
bool tried_auth_unix = false; |
|
bool auth_null_in_list = false; |
|
struct nfs_server *server = ERR_PTR(-EACCES); |
|
rpc_authflavor_t authlist[NFS_MAX_SECFLAVORS]; |
|
unsigned int authlist_len = ARRAY_SIZE(authlist); |
|
|
|
status = nfs_request_mount(fc, ctx->mntfh, authlist, &authlist_len); |
|
if (status) |
|
return ERR_PTR(status); |
|
|
|
/* |
|
* Was a sec= authflavor specified in the options? First, verify |
|
* whether the server supports it, and then just try to use it if so. |
|
*/ |
|
if (ctx->auth_info.flavor_len > 0) { |
|
status = nfs_verify_authflavors(ctx, authlist, authlist_len); |
|
dfprintk(MOUNT, "NFS: using auth flavor %u\n", |
|
ctx->selected_flavor); |
|
if (status) |
|
return ERR_PTR(status); |
|
return ctx->nfs_mod->rpc_ops->create_server(fc); |
|
} |
|
|
|
/* |
|
* No sec= option was provided. RFC 2623, section 2.7 suggests we |
|
* SHOULD prefer the flavor listed first. However, some servers list |
|
* AUTH_NULL first. Avoid ever choosing AUTH_NULL. |
|
*/ |
|
for (i = 0; i < authlist_len; ++i) { |
|
rpc_authflavor_t flavor; |
|
struct rpcsec_gss_info info; |
|
|
|
flavor = authlist[i]; |
|
switch (flavor) { |
|
case RPC_AUTH_UNIX: |
|
tried_auth_unix = true; |
|
break; |
|
case RPC_AUTH_NULL: |
|
auth_null_in_list = true; |
|
continue; |
|
default: |
|
if (rpcauth_get_gssinfo(flavor, &info) != 0) |
|
continue; |
|
break; |
|
} |
|
dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", flavor); |
|
ctx->selected_flavor = flavor; |
|
server = ctx->nfs_mod->rpc_ops->create_server(fc); |
|
if (!IS_ERR(server)) |
|
return server; |
|
} |
|
|
|
/* |
|
* Nothing we tried so far worked. At this point, give up if we've |
|
* already tried AUTH_UNIX or if the server's list doesn't contain |
|
* AUTH_NULL |
|
*/ |
|
if (tried_auth_unix || !auth_null_in_list) |
|
return server; |
|
|
|
/* Last chance! Try AUTH_UNIX */ |
|
dfprintk(MOUNT, "NFS: attempting to use auth flavor %u\n", RPC_AUTH_UNIX); |
|
ctx->selected_flavor = RPC_AUTH_UNIX; |
|
return ctx->nfs_mod->rpc_ops->create_server(fc); |
|
} |
|
|
|
int nfs_try_get_tree(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
|
|
if (ctx->need_mount) |
|
ctx->server = nfs_try_mount_request(fc); |
|
else |
|
ctx->server = ctx->nfs_mod->rpc_ops->create_server(fc); |
|
|
|
return nfs_get_tree_common(fc); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_try_get_tree); |
|
|
|
|
|
#define NFS_REMOUNT_CMP_FLAGMASK ~(NFS_MOUNT_INTR \ |
|
| NFS_MOUNT_SECURE \ |
|
| NFS_MOUNT_TCP \ |
|
| NFS_MOUNT_VER3 \ |
|
| NFS_MOUNT_KERBEROS \ |
|
| NFS_MOUNT_NONLM \ |
|
| NFS_MOUNT_BROKEN_SUID \ |
|
| NFS_MOUNT_STRICTLOCK \ |
|
| NFS_MOUNT_LEGACY_INTERFACE) |
|
|
|
#define NFS_MOUNT_CMP_FLAGMASK (NFS_REMOUNT_CMP_FLAGMASK & \ |
|
~(NFS_MOUNT_UNSHARED | NFS_MOUNT_NORESVPORT)) |
|
|
|
static int |
|
nfs_compare_remount_data(struct nfs_server *nfss, |
|
struct nfs_fs_context *ctx) |
|
{ |
|
if ((ctx->flags ^ nfss->flags) & NFS_REMOUNT_CMP_FLAGMASK || |
|
ctx->rsize != nfss->rsize || |
|
ctx->wsize != nfss->wsize || |
|
ctx->version != nfss->nfs_client->rpc_ops->version || |
|
ctx->minorversion != nfss->nfs_client->cl_minorversion || |
|
ctx->retrans != nfss->client->cl_timeout->to_retries || |
|
!nfs_auth_info_match(&ctx->auth_info, nfss->client->cl_auth->au_flavor) || |
|
ctx->acregmin != nfss->acregmin / HZ || |
|
ctx->acregmax != nfss->acregmax / HZ || |
|
ctx->acdirmin != nfss->acdirmin / HZ || |
|
ctx->acdirmax != nfss->acdirmax / HZ || |
|
ctx->timeo != (10U * nfss->client->cl_timeout->to_initval / HZ) || |
|
(ctx->options & NFS_OPTION_FSCACHE) != (nfss->options & NFS_OPTION_FSCACHE) || |
|
ctx->nfs_server.port != nfss->port || |
|
ctx->nfs_server.addrlen != nfss->nfs_client->cl_addrlen || |
|
!rpc_cmp_addr((struct sockaddr *)&ctx->nfs_server.address, |
|
(struct sockaddr *)&nfss->nfs_client->cl_addr)) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
int nfs_reconfigure(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
struct super_block *sb = fc->root->d_sb; |
|
struct nfs_server *nfss = sb->s_fs_info; |
|
|
|
sync_filesystem(sb); |
|
|
|
/* |
|
* Userspace mount programs that send binary options generally send |
|
* them populated with default values. We have no way to know which |
|
* ones were explicitly specified. Fall back to legacy behavior and |
|
* just return success. |
|
*/ |
|
if (ctx->skip_reconfig_option_check) |
|
return 0; |
|
|
|
/* |
|
* noac is a special case. It implies -o sync, but that's not |
|
* necessarily reflected in the mtab options. reconfigure_super |
|
* will clear SB_SYNCHRONOUS if -o sync wasn't specified in the |
|
* remount options, so we have to explicitly reset it. |
|
*/ |
|
if (ctx->flags & NFS_MOUNT_NOAC) { |
|
fc->sb_flags |= SB_SYNCHRONOUS; |
|
fc->sb_flags_mask |= SB_SYNCHRONOUS; |
|
} |
|
|
|
/* compare new mount options with old ones */ |
|
return nfs_compare_remount_data(nfss, ctx); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_reconfigure); |
|
|
|
/* |
|
* Finish setting up an NFS superblock |
|
*/ |
|
static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx) |
|
{ |
|
struct nfs_server *server = NFS_SB(sb); |
|
|
|
sb->s_blocksize_bits = 0; |
|
sb->s_blocksize = 0; |
|
sb->s_xattr = server->nfs_client->cl_nfs_mod->xattr; |
|
sb->s_op = server->nfs_client->cl_nfs_mod->sops; |
|
if (ctx && ctx->bsize) |
|
sb->s_blocksize = nfs_block_size(ctx->bsize, &sb->s_blocksize_bits); |
|
|
|
if (server->nfs_client->rpc_ops->version != 2) { |
|
/* The VFS shouldn't apply the umask to mode bits. We will do |
|
* so ourselves when necessary. |
|
*/ |
|
sb->s_flags |= SB_POSIXACL; |
|
sb->s_time_gran = 1; |
|
sb->s_export_op = &nfs_export_ops; |
|
} else |
|
sb->s_time_gran = 1000; |
|
|
|
if (server->nfs_client->rpc_ops->version != 4) { |
|
sb->s_time_min = 0; |
|
sb->s_time_max = U32_MAX; |
|
} else { |
|
sb->s_time_min = S64_MIN; |
|
sb->s_time_max = S64_MAX; |
|
} |
|
|
|
sb->s_magic = NFS_SUPER_MAGIC; |
|
|
|
/* We probably want something more informative here */ |
|
snprintf(sb->s_id, sizeof(sb->s_id), |
|
"%u:%u", MAJOR(sb->s_dev), MINOR(sb->s_dev)); |
|
|
|
if (sb->s_blocksize == 0) |
|
sb->s_blocksize = nfs_block_bits(server->wsize, |
|
&sb->s_blocksize_bits); |
|
|
|
nfs_super_set_maxbytes(sb, server->maxfilesize); |
|
} |
|
|
|
static int nfs_compare_mount_options(const struct super_block *s, const struct nfs_server *b, |
|
const struct fs_context *fc) |
|
{ |
|
const struct nfs_server *a = s->s_fs_info; |
|
const struct rpc_clnt *clnt_a = a->client; |
|
const struct rpc_clnt *clnt_b = b->client; |
|
|
|
if ((s->s_flags & NFS_SB_MASK) != (fc->sb_flags & NFS_SB_MASK)) |
|
goto Ebusy; |
|
if (a->nfs_client != b->nfs_client) |
|
goto Ebusy; |
|
if ((a->flags ^ b->flags) & NFS_MOUNT_CMP_FLAGMASK) |
|
goto Ebusy; |
|
if (a->wsize != b->wsize) |
|
goto Ebusy; |
|
if (a->rsize != b->rsize) |
|
goto Ebusy; |
|
if (a->acregmin != b->acregmin) |
|
goto Ebusy; |
|
if (a->acregmax != b->acregmax) |
|
goto Ebusy; |
|
if (a->acdirmin != b->acdirmin) |
|
goto Ebusy; |
|
if (a->acdirmax != b->acdirmax) |
|
goto Ebusy; |
|
if (clnt_a->cl_auth->au_flavor != clnt_b->cl_auth->au_flavor) |
|
goto Ebusy; |
|
return 1; |
|
Ebusy: |
|
return 0; |
|
} |
|
|
|
static int nfs_set_super(struct super_block *s, struct fs_context *fc) |
|
{ |
|
struct nfs_server *server = fc->s_fs_info; |
|
int ret; |
|
|
|
s->s_d_op = server->nfs_client->rpc_ops->dentry_ops; |
|
ret = set_anon_super(s, server); |
|
if (ret == 0) |
|
server->s_dev = s->s_dev; |
|
return ret; |
|
} |
|
|
|
static int nfs_compare_super_address(struct nfs_server *server1, |
|
struct nfs_server *server2) |
|
{ |
|
struct sockaddr *sap1, *sap2; |
|
struct rpc_xprt *xprt1 = server1->client->cl_xprt; |
|
struct rpc_xprt *xprt2 = server2->client->cl_xprt; |
|
|
|
if (!net_eq(xprt1->xprt_net, xprt2->xprt_net)) |
|
return 0; |
|
|
|
sap1 = (struct sockaddr *)&server1->nfs_client->cl_addr; |
|
sap2 = (struct sockaddr *)&server2->nfs_client->cl_addr; |
|
|
|
if (sap1->sa_family != sap2->sa_family) |
|
return 0; |
|
|
|
switch (sap1->sa_family) { |
|
case AF_INET: { |
|
struct sockaddr_in *sin1 = (struct sockaddr_in *)sap1; |
|
struct sockaddr_in *sin2 = (struct sockaddr_in *)sap2; |
|
if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) |
|
return 0; |
|
if (sin1->sin_port != sin2->sin_port) |
|
return 0; |
|
break; |
|
} |
|
case AF_INET6: { |
|
struct sockaddr_in6 *sin1 = (struct sockaddr_in6 *)sap1; |
|
struct sockaddr_in6 *sin2 = (struct sockaddr_in6 *)sap2; |
|
if (!ipv6_addr_equal(&sin1->sin6_addr, &sin2->sin6_addr)) |
|
return 0; |
|
if (sin1->sin6_port != sin2->sin6_port) |
|
return 0; |
|
break; |
|
} |
|
default: |
|
return 0; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
static int nfs_compare_userns(const struct nfs_server *old, |
|
const struct nfs_server *new) |
|
{ |
|
const struct user_namespace *oldns = &init_user_ns; |
|
const struct user_namespace *newns = &init_user_ns; |
|
|
|
if (old->client && old->client->cl_cred) |
|
oldns = old->client->cl_cred->user_ns; |
|
if (new->client && new->client->cl_cred) |
|
newns = new->client->cl_cred->user_ns; |
|
if (oldns != newns) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
static int nfs_compare_super(struct super_block *sb, struct fs_context *fc) |
|
{ |
|
struct nfs_server *server = fc->s_fs_info, *old = NFS_SB(sb); |
|
|
|
if (!nfs_compare_super_address(old, server)) |
|
return 0; |
|
/* Note: NFS_MOUNT_UNSHARED == NFS4_MOUNT_UNSHARED */ |
|
if (old->flags & NFS_MOUNT_UNSHARED) |
|
return 0; |
|
if (memcmp(&old->fsid, &server->fsid, sizeof(old->fsid)) != 0) |
|
return 0; |
|
if (!nfs_compare_userns(old, server)) |
|
return 0; |
|
return nfs_compare_mount_options(sb, server, fc); |
|
} |
|
|
|
#ifdef CONFIG_NFS_FSCACHE |
|
static void nfs_get_cache_cookie(struct super_block *sb, |
|
struct nfs_fs_context *ctx) |
|
{ |
|
struct nfs_server *nfss = NFS_SB(sb); |
|
char *uniq = NULL; |
|
int ulen = 0; |
|
|
|
nfss->fscache_key = NULL; |
|
nfss->fscache = NULL; |
|
|
|
if (!ctx) |
|
return; |
|
|
|
if (ctx->clone_data.sb) { |
|
struct nfs_server *mnt_s = NFS_SB(ctx->clone_data.sb); |
|
if (!(mnt_s->options & NFS_OPTION_FSCACHE)) |
|
return; |
|
if (mnt_s->fscache_key) { |
|
uniq = mnt_s->fscache_key->key.uniquifier; |
|
ulen = mnt_s->fscache_key->key.uniq_len; |
|
} |
|
} else { |
|
if (!(ctx->options & NFS_OPTION_FSCACHE)) |
|
return; |
|
if (ctx->fscache_uniq) { |
|
uniq = ctx->fscache_uniq; |
|
ulen = strlen(ctx->fscache_uniq); |
|
} |
|
} |
|
|
|
nfs_fscache_get_super_cookie(sb, uniq, ulen); |
|
} |
|
#else |
|
static void nfs_get_cache_cookie(struct super_block *sb, |
|
struct nfs_fs_context *ctx) |
|
{ |
|
} |
|
#endif |
|
|
|
int nfs_get_tree_common(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
struct super_block *s; |
|
int (*compare_super)(struct super_block *, struct fs_context *) = nfs_compare_super; |
|
struct nfs_server *server = ctx->server; |
|
int error; |
|
|
|
ctx->server = NULL; |
|
if (IS_ERR(server)) |
|
return PTR_ERR(server); |
|
|
|
if (server->flags & NFS_MOUNT_UNSHARED) |
|
compare_super = NULL; |
|
|
|
/* -o noac implies -o sync */ |
|
if (server->flags & NFS_MOUNT_NOAC) |
|
fc->sb_flags |= SB_SYNCHRONOUS; |
|
|
|
if (ctx->clone_data.sb) |
|
if (ctx->clone_data.sb->s_flags & SB_SYNCHRONOUS) |
|
fc->sb_flags |= SB_SYNCHRONOUS; |
|
|
|
if (server->caps & NFS_CAP_SECURITY_LABEL) |
|
fc->lsm_flags |= SECURITY_LSM_NATIVE_LABELS; |
|
|
|
/* Get a superblock - note that we may end up sharing one that already exists */ |
|
fc->s_fs_info = server; |
|
s = sget_fc(fc, compare_super, nfs_set_super); |
|
fc->s_fs_info = NULL; |
|
if (IS_ERR(s)) { |
|
error = PTR_ERR(s); |
|
nfs_errorf(fc, "NFS: Couldn't get superblock"); |
|
goto out_err_nosb; |
|
} |
|
|
|
if (s->s_fs_info != server) { |
|
nfs_free_server(server); |
|
server = NULL; |
|
} else { |
|
error = super_setup_bdi_name(s, "%u:%u", MAJOR(server->s_dev), |
|
MINOR(server->s_dev)); |
|
if (error) |
|
goto error_splat_super; |
|
s->s_bdi->io_pages = server->rpages; |
|
server->super = s; |
|
} |
|
|
|
if (!s->s_root) { |
|
unsigned bsize = ctx->clone_data.inherited_bsize; |
|
/* initial superblock/root creation */ |
|
nfs_fill_super(s, ctx); |
|
if (bsize) { |
|
s->s_blocksize_bits = bsize; |
|
s->s_blocksize = 1U << bsize; |
|
} |
|
nfs_get_cache_cookie(s, ctx); |
|
} |
|
|
|
error = nfs_get_root(s, fc); |
|
if (error < 0) { |
|
nfs_errorf(fc, "NFS: Couldn't get root dentry"); |
|
goto error_splat_super; |
|
} |
|
|
|
s->s_flags |= SB_ACTIVE; |
|
error = 0; |
|
|
|
out: |
|
return error; |
|
|
|
out_err_nosb: |
|
nfs_free_server(server); |
|
goto out; |
|
error_splat_super: |
|
deactivate_locked_super(s); |
|
goto out; |
|
} |
|
|
|
/* |
|
* Destroy an NFS2/3 superblock |
|
*/ |
|
void nfs_kill_super(struct super_block *s) |
|
{ |
|
struct nfs_server *server = NFS_SB(s); |
|
dev_t dev = s->s_dev; |
|
|
|
generic_shutdown_super(s); |
|
|
|
nfs_fscache_release_super_cookie(s); |
|
|
|
nfs_free_server(server); |
|
free_anon_bdev(dev); |
|
} |
|
EXPORT_SYMBOL_GPL(nfs_kill_super); |
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
|
|
/* |
|
* NFS v4 module parameters need to stay in the |
|
* NFS client for backwards compatibility |
|
*/ |
|
unsigned int nfs_callback_set_tcpport; |
|
unsigned short nfs_callback_nr_threads; |
|
/* Default cache timeout is 10 minutes */ |
|
unsigned int nfs_idmap_cache_timeout = 600; |
|
/* Turn off NFSv4 uid/gid mapping when using AUTH_SYS */ |
|
bool nfs4_disable_idmapping = true; |
|
unsigned short max_session_slots = NFS4_DEF_SLOT_TABLE_SIZE; |
|
unsigned short max_session_cb_slots = NFS4_DEF_CB_SLOT_TABLE_SIZE; |
|
unsigned short send_implementation_id = 1; |
|
char nfs4_client_id_uniquifier[NFS4_CLIENT_ID_UNIQ_LEN] = ""; |
|
bool recover_lost_locks = false; |
|
|
|
EXPORT_SYMBOL_GPL(nfs_callback_nr_threads); |
|
EXPORT_SYMBOL_GPL(nfs_callback_set_tcpport); |
|
EXPORT_SYMBOL_GPL(nfs_idmap_cache_timeout); |
|
EXPORT_SYMBOL_GPL(nfs4_disable_idmapping); |
|
EXPORT_SYMBOL_GPL(max_session_slots); |
|
EXPORT_SYMBOL_GPL(max_session_cb_slots); |
|
EXPORT_SYMBOL_GPL(send_implementation_id); |
|
EXPORT_SYMBOL_GPL(nfs4_client_id_uniquifier); |
|
EXPORT_SYMBOL_GPL(recover_lost_locks); |
|
|
|
#define NFS_CALLBACK_MAXPORTNR (65535U) |
|
|
|
static int param_set_portnr(const char *val, const struct kernel_param *kp) |
|
{ |
|
unsigned long num; |
|
int ret; |
|
|
|
if (!val) |
|
return -EINVAL; |
|
ret = kstrtoul(val, 0, &num); |
|
if (ret || num > NFS_CALLBACK_MAXPORTNR) |
|
return -EINVAL; |
|
*((unsigned int *)kp->arg) = num; |
|
return 0; |
|
} |
|
static const struct kernel_param_ops param_ops_portnr = { |
|
.set = param_set_portnr, |
|
.get = param_get_uint, |
|
}; |
|
#define param_check_portnr(name, p) __param_check(name, p, unsigned int); |
|
|
|
module_param_named(callback_tcpport, nfs_callback_set_tcpport, portnr, 0644); |
|
module_param_named(callback_nr_threads, nfs_callback_nr_threads, ushort, 0644); |
|
MODULE_PARM_DESC(callback_nr_threads, "Number of threads that will be " |
|
"assigned to the NFSv4 callback channels."); |
|
module_param(nfs_idmap_cache_timeout, int, 0644); |
|
module_param(nfs4_disable_idmapping, bool, 0644); |
|
module_param_string(nfs4_unique_id, nfs4_client_id_uniquifier, |
|
NFS4_CLIENT_ID_UNIQ_LEN, 0600); |
|
MODULE_PARM_DESC(nfs4_disable_idmapping, |
|
"Turn off NFSv4 idmapping when using 'sec=sys'"); |
|
module_param(max_session_slots, ushort, 0644); |
|
MODULE_PARM_DESC(max_session_slots, "Maximum number of outstanding NFSv4.1 " |
|
"requests the client will negotiate"); |
|
module_param(max_session_cb_slots, ushort, 0644); |
|
MODULE_PARM_DESC(max_session_cb_slots, "Maximum number of parallel NFSv4.1 " |
|
"callbacks the client will process for a given server"); |
|
module_param(send_implementation_id, ushort, 0644); |
|
MODULE_PARM_DESC(send_implementation_id, |
|
"Send implementation ID with NFSv4.1 exchange_id"); |
|
MODULE_PARM_DESC(nfs4_unique_id, "nfs_client_id4 uniquifier string"); |
|
|
|
module_param(recover_lost_locks, bool, 0644); |
|
MODULE_PARM_DESC(recover_lost_locks, |
|
"If the server reports that a lock might be lost, " |
|
"try to recover it risking data corruption."); |
|
|
|
|
|
#endif /* CONFIG_NFS_V4 */
|
|
|