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1520 lines
38 KiB
1520 lines
38 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/fs/nfs/fs_context.c |
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* |
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* Copyright (C) 1992 Rick Sladkey |
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* Conversion to new mount api Copyright (C) David Howells |
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* |
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* NFS mount handling. |
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* |
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* Split from fs/nfs/super.c by David Howells <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/fs.h> |
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#include <linux/fs_context.h> |
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#include <linux/fs_parser.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 "nfs.h" |
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#include "internal.h" |
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|
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#define NFSDBG_FACILITY NFSDBG_MOUNT |
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|
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#if IS_ENABLED(CONFIG_NFS_V3) |
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#define NFS_DEFAULT_VERSION 3 |
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#else |
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#define NFS_DEFAULT_VERSION 2 |
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#endif |
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|
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#define NFS_MAX_CONNECTIONS 16 |
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|
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enum nfs_param { |
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Opt_ac, |
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Opt_acdirmax, |
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Opt_acdirmin, |
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Opt_acl, |
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Opt_acregmax, |
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Opt_acregmin, |
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Opt_actimeo, |
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Opt_addr, |
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Opt_bg, |
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Opt_bsize, |
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Opt_clientaddr, |
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Opt_cto, |
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Opt_fg, |
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Opt_fscache, |
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Opt_fscache_flag, |
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Opt_hard, |
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Opt_intr, |
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Opt_local_lock, |
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Opt_lock, |
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Opt_lookupcache, |
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Opt_migration, |
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Opt_minorversion, |
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Opt_mountaddr, |
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Opt_mounthost, |
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Opt_mountport, |
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Opt_mountproto, |
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Opt_mountvers, |
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Opt_namelen, |
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Opt_nconnect, |
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Opt_port, |
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Opt_posix, |
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Opt_proto, |
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Opt_rdirplus, |
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Opt_rdma, |
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Opt_resvport, |
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Opt_retrans, |
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Opt_retry, |
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Opt_rsize, |
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Opt_sec, |
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Opt_sharecache, |
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Opt_sloppy, |
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Opt_soft, |
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Opt_softerr, |
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Opt_softreval, |
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Opt_source, |
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Opt_tcp, |
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Opt_timeo, |
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Opt_udp, |
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Opt_v, |
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Opt_vers, |
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Opt_wsize, |
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}; |
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|
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enum { |
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Opt_local_lock_all, |
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Opt_local_lock_flock, |
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Opt_local_lock_none, |
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Opt_local_lock_posix, |
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}; |
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|
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static const struct constant_table nfs_param_enums_local_lock[] = { |
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{ "all", Opt_local_lock_all }, |
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{ "flock", Opt_local_lock_flock }, |
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{ "posix", Opt_local_lock_posix }, |
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{ "none", Opt_local_lock_none }, |
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{} |
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}; |
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|
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enum { |
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Opt_lookupcache_all, |
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Opt_lookupcache_none, |
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Opt_lookupcache_positive, |
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}; |
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|
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static const struct constant_table nfs_param_enums_lookupcache[] = { |
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{ "all", Opt_lookupcache_all }, |
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{ "none", Opt_lookupcache_none }, |
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{ "pos", Opt_lookupcache_positive }, |
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{ "positive", Opt_lookupcache_positive }, |
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{} |
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}; |
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|
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static const struct fs_parameter_spec nfs_fs_parameters[] = { |
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fsparam_flag_no("ac", Opt_ac), |
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fsparam_u32 ("acdirmax", Opt_acdirmax), |
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fsparam_u32 ("acdirmin", Opt_acdirmin), |
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fsparam_flag_no("acl", Opt_acl), |
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fsparam_u32 ("acregmax", Opt_acregmax), |
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fsparam_u32 ("acregmin", Opt_acregmin), |
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fsparam_u32 ("actimeo", Opt_actimeo), |
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fsparam_string("addr", Opt_addr), |
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fsparam_flag ("bg", Opt_bg), |
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fsparam_u32 ("bsize", Opt_bsize), |
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fsparam_string("clientaddr", Opt_clientaddr), |
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fsparam_flag_no("cto", Opt_cto), |
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fsparam_flag ("fg", Opt_fg), |
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fsparam_flag_no("fsc", Opt_fscache_flag), |
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fsparam_string("fsc", Opt_fscache), |
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fsparam_flag ("hard", Opt_hard), |
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__fsparam(NULL, "intr", Opt_intr, |
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fs_param_neg_with_no|fs_param_deprecated, NULL), |
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fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock), |
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fsparam_flag_no("lock", Opt_lock), |
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fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache), |
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fsparam_flag_no("migration", Opt_migration), |
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fsparam_u32 ("minorversion", Opt_minorversion), |
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fsparam_string("mountaddr", Opt_mountaddr), |
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fsparam_string("mounthost", Opt_mounthost), |
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fsparam_u32 ("mountport", Opt_mountport), |
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fsparam_string("mountproto", Opt_mountproto), |
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fsparam_u32 ("mountvers", Opt_mountvers), |
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fsparam_u32 ("namlen", Opt_namelen), |
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fsparam_u32 ("nconnect", Opt_nconnect), |
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fsparam_string("nfsvers", Opt_vers), |
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fsparam_u32 ("port", Opt_port), |
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fsparam_flag_no("posix", Opt_posix), |
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fsparam_string("proto", Opt_proto), |
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fsparam_flag_no("rdirplus", Opt_rdirplus), |
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fsparam_flag ("rdma", Opt_rdma), |
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fsparam_flag_no("resvport", Opt_resvport), |
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fsparam_u32 ("retrans", Opt_retrans), |
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fsparam_string("retry", Opt_retry), |
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fsparam_u32 ("rsize", Opt_rsize), |
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fsparam_string("sec", Opt_sec), |
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fsparam_flag_no("sharecache", Opt_sharecache), |
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fsparam_flag ("sloppy", Opt_sloppy), |
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fsparam_flag ("soft", Opt_soft), |
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fsparam_flag ("softerr", Opt_softerr), |
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fsparam_flag ("softreval", Opt_softreval), |
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fsparam_string("source", Opt_source), |
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fsparam_flag ("tcp", Opt_tcp), |
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fsparam_u32 ("timeo", Opt_timeo), |
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fsparam_flag ("udp", Opt_udp), |
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fsparam_flag ("v2", Opt_v), |
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fsparam_flag ("v3", Opt_v), |
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fsparam_flag ("v4", Opt_v), |
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fsparam_flag ("v4.0", Opt_v), |
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fsparam_flag ("v4.1", Opt_v), |
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fsparam_flag ("v4.2", Opt_v), |
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fsparam_string("vers", Opt_vers), |
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fsparam_u32 ("wsize", Opt_wsize), |
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{} |
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}; |
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|
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enum { |
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Opt_vers_2, |
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Opt_vers_3, |
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Opt_vers_4, |
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Opt_vers_4_0, |
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Opt_vers_4_1, |
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Opt_vers_4_2, |
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}; |
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|
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static const struct constant_table nfs_vers_tokens[] = { |
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{ "2", Opt_vers_2 }, |
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{ "3", Opt_vers_3 }, |
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{ "4", Opt_vers_4 }, |
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{ "4.0", Opt_vers_4_0 }, |
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{ "4.1", Opt_vers_4_1 }, |
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{ "4.2", Opt_vers_4_2 }, |
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{} |
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}; |
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|
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enum { |
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Opt_xprt_rdma, |
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Opt_xprt_rdma6, |
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Opt_xprt_tcp, |
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Opt_xprt_tcp6, |
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Opt_xprt_udp, |
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Opt_xprt_udp6, |
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nr__Opt_xprt |
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}; |
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|
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static const struct constant_table nfs_xprt_protocol_tokens[] = { |
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{ "rdma", Opt_xprt_rdma }, |
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{ "rdma6", Opt_xprt_rdma6 }, |
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{ "tcp", Opt_xprt_tcp }, |
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{ "tcp6", Opt_xprt_tcp6 }, |
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{ "udp", Opt_xprt_udp }, |
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{ "udp6", Opt_xprt_udp6 }, |
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{} |
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}; |
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enum { |
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Opt_sec_krb5, |
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Opt_sec_krb5i, |
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Opt_sec_krb5p, |
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Opt_sec_lkey, |
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Opt_sec_lkeyi, |
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Opt_sec_lkeyp, |
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Opt_sec_none, |
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Opt_sec_spkm, |
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Opt_sec_spkmi, |
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Opt_sec_spkmp, |
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Opt_sec_sys, |
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nr__Opt_sec |
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}; |
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|
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static const struct constant_table nfs_secflavor_tokens[] = { |
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{ "krb5", Opt_sec_krb5 }, |
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{ "krb5i", Opt_sec_krb5i }, |
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{ "krb5p", Opt_sec_krb5p }, |
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{ "lkey", Opt_sec_lkey }, |
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{ "lkeyi", Opt_sec_lkeyi }, |
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{ "lkeyp", Opt_sec_lkeyp }, |
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{ "none", Opt_sec_none }, |
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{ "null", Opt_sec_none }, |
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{ "spkm3", Opt_sec_spkm }, |
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{ "spkm3i", Opt_sec_spkmi }, |
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{ "spkm3p", Opt_sec_spkmp }, |
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{ "sys", Opt_sec_sys }, |
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{} |
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}; |
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/* |
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* Sanity-check a server address provided by the mount command. |
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* |
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* Address family must be initialized, and address must not be |
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* the ANY address for that family. |
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*/ |
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static int nfs_verify_server_address(struct sockaddr *addr) |
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{ |
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switch (addr->sa_family) { |
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case AF_INET: { |
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struct sockaddr_in *sa = (struct sockaddr_in *)addr; |
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return sa->sin_addr.s_addr != htonl(INADDR_ANY); |
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} |
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case AF_INET6: { |
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struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; |
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return !ipv6_addr_any(sa); |
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} |
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} |
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dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); |
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return 0; |
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} |
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/* |
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* Sanity check the NFS transport protocol. |
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* |
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*/ |
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static void nfs_validate_transport_protocol(struct nfs_fs_context *ctx) |
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{ |
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switch (ctx->nfs_server.protocol) { |
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case XPRT_TRANSPORT_UDP: |
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case XPRT_TRANSPORT_TCP: |
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case XPRT_TRANSPORT_RDMA: |
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break; |
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default: |
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ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
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} |
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} |
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/* |
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* For text based NFSv2/v3 mounts, the mount protocol transport default |
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* settings should depend upon the specified NFS transport. |
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*/ |
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static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx) |
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{ |
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nfs_validate_transport_protocol(ctx); |
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|
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if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP || |
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ctx->mount_server.protocol == XPRT_TRANSPORT_TCP) |
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return; |
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switch (ctx->nfs_server.protocol) { |
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case XPRT_TRANSPORT_UDP: |
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ctx->mount_server.protocol = XPRT_TRANSPORT_UDP; |
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break; |
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case XPRT_TRANSPORT_TCP: |
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case XPRT_TRANSPORT_RDMA: |
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ctx->mount_server.protocol = XPRT_TRANSPORT_TCP; |
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} |
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} |
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/* |
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* Add 'flavor' to 'auth_info' if not already present. |
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* Returns true if 'flavor' ends up in the list, false otherwise |
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*/ |
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static int nfs_auth_info_add(struct fs_context *fc, |
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struct nfs_auth_info *auth_info, |
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rpc_authflavor_t flavor) |
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{ |
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unsigned int i; |
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unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); |
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|
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/* make sure this flavor isn't already in the list */ |
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for (i = 0; i < auth_info->flavor_len; i++) { |
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if (flavor == auth_info->flavors[i]) |
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return 0; |
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} |
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if (auth_info->flavor_len + 1 >= max_flavor_len) |
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return nfs_invalf(fc, "NFS: too many sec= flavors"); |
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auth_info->flavors[auth_info->flavor_len++] = flavor; |
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return 0; |
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} |
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|
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/* |
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* Parse the value of the 'sec=' option. |
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*/ |
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static int nfs_parse_security_flavors(struct fs_context *fc, |
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struct fs_parameter *param) |
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{ |
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struct nfs_fs_context *ctx = nfs_fc2context(fc); |
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rpc_authflavor_t pseudoflavor; |
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char *string = param->string, *p; |
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int ret; |
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|
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dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string); |
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|
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while ((p = strsep(&string, ":")) != NULL) { |
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if (!*p) |
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continue; |
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switch (lookup_constant(nfs_secflavor_tokens, p, -1)) { |
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case Opt_sec_none: |
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pseudoflavor = RPC_AUTH_NULL; |
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break; |
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case Opt_sec_sys: |
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pseudoflavor = RPC_AUTH_UNIX; |
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break; |
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case Opt_sec_krb5: |
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pseudoflavor = RPC_AUTH_GSS_KRB5; |
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break; |
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case Opt_sec_krb5i: |
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pseudoflavor = RPC_AUTH_GSS_KRB5I; |
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break; |
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case Opt_sec_krb5p: |
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pseudoflavor = RPC_AUTH_GSS_KRB5P; |
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break; |
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case Opt_sec_lkey: |
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pseudoflavor = RPC_AUTH_GSS_LKEY; |
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break; |
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case Opt_sec_lkeyi: |
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pseudoflavor = RPC_AUTH_GSS_LKEYI; |
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break; |
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case Opt_sec_lkeyp: |
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pseudoflavor = RPC_AUTH_GSS_LKEYP; |
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break; |
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case Opt_sec_spkm: |
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pseudoflavor = RPC_AUTH_GSS_SPKM; |
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break; |
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case Opt_sec_spkmi: |
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pseudoflavor = RPC_AUTH_GSS_SPKMI; |
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break; |
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case Opt_sec_spkmp: |
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pseudoflavor = RPC_AUTH_GSS_SPKMP; |
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break; |
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default: |
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return nfs_invalf(fc, "NFS: sec=%s option not recognized", p); |
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} |
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|
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ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor); |
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if (ret < 0) |
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return ret; |
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} |
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|
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return 0; |
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} |
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|
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static int nfs_parse_version_string(struct fs_context *fc, |
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const char *string) |
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{ |
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struct nfs_fs_context *ctx = nfs_fc2context(fc); |
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|
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ctx->flags &= ~NFS_MOUNT_VER3; |
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switch (lookup_constant(nfs_vers_tokens, string, -1)) { |
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case Opt_vers_2: |
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ctx->version = 2; |
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break; |
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case Opt_vers_3: |
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ctx->flags |= NFS_MOUNT_VER3; |
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ctx->version = 3; |
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break; |
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case Opt_vers_4: |
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/* Backward compatibility option. In future, |
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* the mount program should always supply |
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* a NFSv4 minor version number. |
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*/ |
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ctx->version = 4; |
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break; |
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case Opt_vers_4_0: |
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ctx->version = 4; |
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ctx->minorversion = 0; |
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break; |
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case Opt_vers_4_1: |
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ctx->version = 4; |
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ctx->minorversion = 1; |
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break; |
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case Opt_vers_4_2: |
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ctx->version = 4; |
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ctx->minorversion = 2; |
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break; |
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default: |
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return nfs_invalf(fc, "NFS: Unsupported NFS version"); |
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} |
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return 0; |
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} |
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|
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/* |
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* Parse a single mount parameter. |
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*/ |
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static int nfs_fs_context_parse_param(struct fs_context *fc, |
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struct fs_parameter *param) |
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{ |
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struct fs_parse_result result; |
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struct nfs_fs_context *ctx = nfs_fc2context(fc); |
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unsigned short protofamily, mountfamily; |
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unsigned int len; |
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int ret, opt; |
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|
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dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key); |
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|
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opt = fs_parse(fc, nfs_fs_parameters, param, &result); |
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if (opt < 0) |
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return ctx->sloppy ? 1 : opt; |
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|
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switch (opt) { |
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case Opt_source: |
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if (fc->source) |
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return nfs_invalf(fc, "NFS: Multiple sources not supported"); |
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fc->source = param->string; |
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param->string = NULL; |
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break; |
|
|
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/* |
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* boolean options: foo/nofoo |
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*/ |
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case Opt_soft: |
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ctx->flags |= NFS_MOUNT_SOFT; |
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ctx->flags &= ~NFS_MOUNT_SOFTERR; |
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break; |
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case Opt_softerr: |
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ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL; |
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ctx->flags &= ~NFS_MOUNT_SOFT; |
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break; |
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case Opt_hard: |
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ctx->flags &= ~(NFS_MOUNT_SOFT | |
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NFS_MOUNT_SOFTERR | |
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NFS_MOUNT_SOFTREVAL); |
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break; |
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case Opt_softreval: |
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if (result.negated) |
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ctx->flags &= ~NFS_MOUNT_SOFTREVAL; |
|
else |
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ctx->flags &= NFS_MOUNT_SOFTREVAL; |
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break; |
|
case Opt_posix: |
|
if (result.negated) |
|
ctx->flags &= ~NFS_MOUNT_POSIX; |
|
else |
|
ctx->flags |= NFS_MOUNT_POSIX; |
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break; |
|
case Opt_cto: |
|
if (result.negated) |
|
ctx->flags |= NFS_MOUNT_NOCTO; |
|
else |
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ctx->flags &= ~NFS_MOUNT_NOCTO; |
|
break; |
|
case Opt_ac: |
|
if (result.negated) |
|
ctx->flags |= NFS_MOUNT_NOAC; |
|
else |
|
ctx->flags &= ~NFS_MOUNT_NOAC; |
|
break; |
|
case Opt_lock: |
|
if (result.negated) { |
|
ctx->flags |= NFS_MOUNT_NONLM; |
|
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); |
|
} else { |
|
ctx->flags &= ~NFS_MOUNT_NONLM; |
|
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); |
|
} |
|
break; |
|
case Opt_udp: |
|
ctx->flags &= ~NFS_MOUNT_TCP; |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
|
break; |
|
case Opt_tcp: |
|
ctx->flags |= NFS_MOUNT_TCP; |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
|
break; |
|
case Opt_rdma: |
|
ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */ |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA; |
|
xprt_load_transport(param->key); |
|
break; |
|
case Opt_acl: |
|
if (result.negated) |
|
ctx->flags |= NFS_MOUNT_NOACL; |
|
else |
|
ctx->flags &= ~NFS_MOUNT_NOACL; |
|
break; |
|
case Opt_rdirplus: |
|
if (result.negated) |
|
ctx->flags |= NFS_MOUNT_NORDIRPLUS; |
|
else |
|
ctx->flags &= ~NFS_MOUNT_NORDIRPLUS; |
|
break; |
|
case Opt_sharecache: |
|
if (result.negated) |
|
ctx->flags |= NFS_MOUNT_UNSHARED; |
|
else |
|
ctx->flags &= ~NFS_MOUNT_UNSHARED; |
|
break; |
|
case Opt_resvport: |
|
if (result.negated) |
|
ctx->flags |= NFS_MOUNT_NORESVPORT; |
|
else |
|
ctx->flags &= ~NFS_MOUNT_NORESVPORT; |
|
break; |
|
case Opt_fscache_flag: |
|
if (result.negated) |
|
ctx->options &= ~NFS_OPTION_FSCACHE; |
|
else |
|
ctx->options |= NFS_OPTION_FSCACHE; |
|
kfree(ctx->fscache_uniq); |
|
ctx->fscache_uniq = NULL; |
|
break; |
|
case Opt_fscache: |
|
ctx->options |= NFS_OPTION_FSCACHE; |
|
kfree(ctx->fscache_uniq); |
|
ctx->fscache_uniq = param->string; |
|
param->string = NULL; |
|
break; |
|
case Opt_migration: |
|
if (result.negated) |
|
ctx->options &= ~NFS_OPTION_MIGRATION; |
|
else |
|
ctx->options |= NFS_OPTION_MIGRATION; |
|
break; |
|
|
|
/* |
|
* options that take numeric values |
|
*/ |
|
case Opt_port: |
|
if (result.uint_32 > USHRT_MAX) |
|
goto out_of_bounds; |
|
ctx->nfs_server.port = result.uint_32; |
|
break; |
|
case Opt_rsize: |
|
ctx->rsize = result.uint_32; |
|
break; |
|
case Opt_wsize: |
|
ctx->wsize = result.uint_32; |
|
break; |
|
case Opt_bsize: |
|
ctx->bsize = result.uint_32; |
|
break; |
|
case Opt_timeo: |
|
if (result.uint_32 < 1 || result.uint_32 > INT_MAX) |
|
goto out_of_bounds; |
|
ctx->timeo = result.uint_32; |
|
break; |
|
case Opt_retrans: |
|
if (result.uint_32 > INT_MAX) |
|
goto out_of_bounds; |
|
ctx->retrans = result.uint_32; |
|
break; |
|
case Opt_acregmin: |
|
ctx->acregmin = result.uint_32; |
|
break; |
|
case Opt_acregmax: |
|
ctx->acregmax = result.uint_32; |
|
break; |
|
case Opt_acdirmin: |
|
ctx->acdirmin = result.uint_32; |
|
break; |
|
case Opt_acdirmax: |
|
ctx->acdirmax = result.uint_32; |
|
break; |
|
case Opt_actimeo: |
|
ctx->acregmin = result.uint_32; |
|
ctx->acregmax = result.uint_32; |
|
ctx->acdirmin = result.uint_32; |
|
ctx->acdirmax = result.uint_32; |
|
break; |
|
case Opt_namelen: |
|
ctx->namlen = result.uint_32; |
|
break; |
|
case Opt_mountport: |
|
if (result.uint_32 > USHRT_MAX) |
|
goto out_of_bounds; |
|
ctx->mount_server.port = result.uint_32; |
|
break; |
|
case Opt_mountvers: |
|
if (result.uint_32 < NFS_MNT_VERSION || |
|
result.uint_32 > NFS_MNT3_VERSION) |
|
goto out_of_bounds; |
|
ctx->mount_server.version = result.uint_32; |
|
break; |
|
case Opt_minorversion: |
|
if (result.uint_32 > NFS4_MAX_MINOR_VERSION) |
|
goto out_of_bounds; |
|
ctx->minorversion = result.uint_32; |
|
break; |
|
|
|
/* |
|
* options that take text values |
|
*/ |
|
case Opt_v: |
|
ret = nfs_parse_version_string(fc, param->key + 1); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
case Opt_vers: |
|
ret = nfs_parse_version_string(fc, param->string); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
case Opt_sec: |
|
ret = nfs_parse_security_flavors(fc, param); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
|
|
case Opt_proto: |
|
protofamily = AF_INET; |
|
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) { |
|
case Opt_xprt_udp6: |
|
protofamily = AF_INET6; |
|
fallthrough; |
|
case Opt_xprt_udp: |
|
ctx->flags &= ~NFS_MOUNT_TCP; |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
|
break; |
|
case Opt_xprt_tcp6: |
|
protofamily = AF_INET6; |
|
fallthrough; |
|
case Opt_xprt_tcp: |
|
ctx->flags |= NFS_MOUNT_TCP; |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
|
break; |
|
case Opt_xprt_rdma6: |
|
protofamily = AF_INET6; |
|
fallthrough; |
|
case Opt_xprt_rdma: |
|
/* vector side protocols to TCP */ |
|
ctx->flags |= NFS_MOUNT_TCP; |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_RDMA; |
|
xprt_load_transport(param->string); |
|
break; |
|
default: |
|
return nfs_invalf(fc, "NFS: Unrecognized transport protocol"); |
|
} |
|
|
|
ctx->protofamily = protofamily; |
|
break; |
|
|
|
case Opt_mountproto: |
|
mountfamily = AF_INET; |
|
switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) { |
|
case Opt_xprt_udp6: |
|
mountfamily = AF_INET6; |
|
fallthrough; |
|
case Opt_xprt_udp: |
|
ctx->mount_server.protocol = XPRT_TRANSPORT_UDP; |
|
break; |
|
case Opt_xprt_tcp6: |
|
mountfamily = AF_INET6; |
|
fallthrough; |
|
case Opt_xprt_tcp: |
|
ctx->mount_server.protocol = XPRT_TRANSPORT_TCP; |
|
break; |
|
case Opt_xprt_rdma: /* not used for side protocols */ |
|
default: |
|
return nfs_invalf(fc, "NFS: Unrecognized transport protocol"); |
|
} |
|
ctx->mountfamily = mountfamily; |
|
break; |
|
|
|
case Opt_addr: |
|
len = rpc_pton(fc->net_ns, param->string, param->size, |
|
&ctx->nfs_server.address, |
|
sizeof(ctx->nfs_server._address)); |
|
if (len == 0) |
|
goto out_invalid_address; |
|
ctx->nfs_server.addrlen = len; |
|
break; |
|
case Opt_clientaddr: |
|
kfree(ctx->client_address); |
|
ctx->client_address = param->string; |
|
param->string = NULL; |
|
break; |
|
case Opt_mounthost: |
|
kfree(ctx->mount_server.hostname); |
|
ctx->mount_server.hostname = param->string; |
|
param->string = NULL; |
|
break; |
|
case Opt_mountaddr: |
|
len = rpc_pton(fc->net_ns, param->string, param->size, |
|
&ctx->mount_server.address, |
|
sizeof(ctx->mount_server._address)); |
|
if (len == 0) |
|
goto out_invalid_address; |
|
ctx->mount_server.addrlen = len; |
|
break; |
|
case Opt_nconnect: |
|
if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS) |
|
goto out_of_bounds; |
|
ctx->nfs_server.nconnect = result.uint_32; |
|
break; |
|
case Opt_lookupcache: |
|
switch (result.uint_32) { |
|
case Opt_lookupcache_all: |
|
ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); |
|
break; |
|
case Opt_lookupcache_positive: |
|
ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; |
|
ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; |
|
break; |
|
case Opt_lookupcache_none: |
|
ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; |
|
break; |
|
default: |
|
goto out_invalid_value; |
|
} |
|
break; |
|
case Opt_local_lock: |
|
switch (result.uint_32) { |
|
case Opt_local_lock_all: |
|
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | |
|
NFS_MOUNT_LOCAL_FCNTL); |
|
break; |
|
case Opt_local_lock_flock: |
|
ctx->flags |= NFS_MOUNT_LOCAL_FLOCK; |
|
break; |
|
case Opt_local_lock_posix: |
|
ctx->flags |= NFS_MOUNT_LOCAL_FCNTL; |
|
break; |
|
case Opt_local_lock_none: |
|
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | |
|
NFS_MOUNT_LOCAL_FCNTL); |
|
break; |
|
default: |
|
goto out_invalid_value; |
|
} |
|
break; |
|
|
|
/* |
|
* Special options |
|
*/ |
|
case Opt_sloppy: |
|
ctx->sloppy = true; |
|
dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); |
|
break; |
|
} |
|
|
|
return 0; |
|
|
|
out_invalid_value: |
|
return nfs_invalf(fc, "NFS: Bad mount option value specified"); |
|
out_invalid_address: |
|
return nfs_invalf(fc, "NFS: Bad IP address specified"); |
|
out_of_bounds: |
|
return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key); |
|
} |
|
|
|
/* |
|
* Split fc->source into "hostname:export_path". |
|
* |
|
* The leftmost colon demarks the split between the server's hostname |
|
* and the export path. If the hostname starts with a left square |
|
* bracket, then it may contain colons. |
|
* |
|
* Note: caller frees hostname and export path, even on error. |
|
*/ |
|
static int nfs_parse_source(struct fs_context *fc, |
|
size_t maxnamlen, size_t maxpathlen) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
const char *dev_name = fc->source; |
|
size_t len; |
|
const char *end; |
|
|
|
if (unlikely(!dev_name || !*dev_name)) { |
|
dfprintk(MOUNT, "NFS: device name not specified\n"); |
|
return -EINVAL; |
|
} |
|
|
|
/* Is the host name protected with square brakcets? */ |
|
if (*dev_name == '[') { |
|
end = strchr(++dev_name, ']'); |
|
if (end == NULL || end[1] != ':') |
|
goto out_bad_devname; |
|
|
|
len = end - dev_name; |
|
end++; |
|
} else { |
|
const char *comma; |
|
|
|
end = strchr(dev_name, ':'); |
|
if (end == NULL) |
|
goto out_bad_devname; |
|
len = end - dev_name; |
|
|
|
/* kill possible hostname list: not supported */ |
|
comma = memchr(dev_name, ',', len); |
|
if (comma) |
|
len = comma - dev_name; |
|
} |
|
|
|
if (len > maxnamlen) |
|
goto out_hostname; |
|
|
|
kfree(ctx->nfs_server.hostname); |
|
|
|
/* N.B. caller will free nfs_server.hostname in all cases */ |
|
ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL); |
|
if (!ctx->nfs_server.hostname) |
|
goto out_nomem; |
|
len = strlen(++end); |
|
if (len > maxpathlen) |
|
goto out_path; |
|
ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL); |
|
if (!ctx->nfs_server.export_path) |
|
goto out_nomem; |
|
|
|
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path); |
|
return 0; |
|
|
|
out_bad_devname: |
|
return nfs_invalf(fc, "NFS: device name not in host:path format"); |
|
out_nomem: |
|
nfs_errorf(fc, "NFS: not enough memory to parse device name"); |
|
return -ENOMEM; |
|
out_hostname: |
|
nfs_errorf(fc, "NFS: server hostname too long"); |
|
return -ENAMETOOLONG; |
|
out_path: |
|
nfs_errorf(fc, "NFS: export pathname too long"); |
|
return -ENAMETOOLONG; |
|
} |
|
|
|
static inline bool is_remount_fc(struct fs_context *fc) |
|
{ |
|
return fc->root != NULL; |
|
} |
|
|
|
/* |
|
* Parse monolithic NFS2/NFS3 mount data |
|
* - fills in the mount root filehandle |
|
* |
|
* For option strings, user space handles the following behaviors: |
|
* |
|
* + DNS: mapping server host name to IP address ("addr=" option) |
|
* |
|
* + failure mode: how to behave if a mount request can't be handled |
|
* immediately ("fg/bg" option) |
|
* |
|
* + retry: how often to retry a mount request ("retry=" option) |
|
* |
|
* + breaking back: trying proto=udp after proto=tcp, v2 after v3, |
|
* mountproto=tcp after mountproto=udp, and so on |
|
*/ |
|
static int nfs23_parse_monolithic(struct fs_context *fc, |
|
struct nfs_mount_data *data) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
struct nfs_fh *mntfh = ctx->mntfh; |
|
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; |
|
int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; |
|
|
|
if (data == NULL) |
|
goto out_no_data; |
|
|
|
ctx->version = NFS_DEFAULT_VERSION; |
|
switch (data->version) { |
|
case 1: |
|
data->namlen = 0; |
|
fallthrough; |
|
case 2: |
|
data->bsize = 0; |
|
fallthrough; |
|
case 3: |
|
if (data->flags & NFS_MOUNT_VER3) |
|
goto out_no_v3; |
|
data->root.size = NFS2_FHSIZE; |
|
memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); |
|
/* Turn off security negotiation */ |
|
extra_flags |= NFS_MOUNT_SECFLAVOUR; |
|
fallthrough; |
|
case 4: |
|
if (data->flags & NFS_MOUNT_SECFLAVOUR) |
|
goto out_no_sec; |
|
fallthrough; |
|
case 5: |
|
memset(data->context, 0, sizeof(data->context)); |
|
fallthrough; |
|
case 6: |
|
if (data->flags & NFS_MOUNT_VER3) { |
|
if (data->root.size > NFS3_FHSIZE || data->root.size == 0) |
|
goto out_invalid_fh; |
|
mntfh->size = data->root.size; |
|
ctx->version = 3; |
|
} else { |
|
mntfh->size = NFS2_FHSIZE; |
|
ctx->version = 2; |
|
} |
|
|
|
|
|
memcpy(mntfh->data, data->root.data, mntfh->size); |
|
if (mntfh->size < sizeof(mntfh->data)) |
|
memset(mntfh->data + mntfh->size, 0, |
|
sizeof(mntfh->data) - mntfh->size); |
|
|
|
/* |
|
* for proto == XPRT_TRANSPORT_UDP, which is what uses |
|
* to_exponential, implying shift: limit the shift value |
|
* to BITS_PER_LONG (majortimeo is unsigned long) |
|
*/ |
|
if (!(data->flags & NFS_MOUNT_TCP)) /* this will be UDP */ |
|
if (data->retrans >= 64) /* shift value is too large */ |
|
goto out_invalid_data; |
|
|
|
/* |
|
* Translate to nfs_fs_context, which nfs_fill_super |
|
* can deal with. |
|
*/ |
|
ctx->flags = data->flags & NFS_MOUNT_FLAGMASK; |
|
ctx->flags |= extra_flags; |
|
ctx->rsize = data->rsize; |
|
ctx->wsize = data->wsize; |
|
ctx->timeo = data->timeo; |
|
ctx->retrans = data->retrans; |
|
ctx->acregmin = data->acregmin; |
|
ctx->acregmax = data->acregmax; |
|
ctx->acdirmin = data->acdirmin; |
|
ctx->acdirmax = data->acdirmax; |
|
ctx->need_mount = false; |
|
|
|
memcpy(sap, &data->addr, sizeof(data->addr)); |
|
ctx->nfs_server.addrlen = sizeof(data->addr); |
|
ctx->nfs_server.port = ntohs(data->addr.sin_port); |
|
if (sap->sa_family != AF_INET || |
|
!nfs_verify_server_address(sap)) |
|
goto out_no_address; |
|
|
|
if (!(data->flags & NFS_MOUNT_TCP)) |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP; |
|
/* N.B. caller will free nfs_server.hostname in all cases */ |
|
ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); |
|
if (!ctx->nfs_server.hostname) |
|
goto out_nomem; |
|
|
|
ctx->namlen = data->namlen; |
|
ctx->bsize = data->bsize; |
|
|
|
if (data->flags & NFS_MOUNT_SECFLAVOUR) |
|
ctx->selected_flavor = data->pseudoflavor; |
|
else |
|
ctx->selected_flavor = RPC_AUTH_UNIX; |
|
|
|
if (!(data->flags & NFS_MOUNT_NONLM)) |
|
ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| |
|
NFS_MOUNT_LOCAL_FCNTL); |
|
else |
|
ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK| |
|
NFS_MOUNT_LOCAL_FCNTL); |
|
|
|
/* |
|
* The legacy version 6 binary mount data from userspace has a |
|
* field used only to transport selinux information into the |
|
* kernel. To continue to support that functionality we |
|
* have a touch of selinux knowledge here in the NFS code. The |
|
* userspace code converted context=blah to just blah so we are |
|
* converting back to the full string selinux understands. |
|
*/ |
|
if (data->context[0]){ |
|
#ifdef CONFIG_SECURITY_SELINUX |
|
int ret; |
|
|
|
data->context[NFS_MAX_CONTEXT_LEN] = '\0'; |
|
ret = vfs_parse_fs_string(fc, "context", |
|
data->context, strlen(data->context)); |
|
if (ret < 0) |
|
return ret; |
|
#else |
|
return -EINVAL; |
|
#endif |
|
} |
|
|
|
break; |
|
default: |
|
goto generic; |
|
} |
|
|
|
ctx->skip_reconfig_option_check = true; |
|
return 0; |
|
|
|
generic: |
|
return generic_parse_monolithic(fc, data); |
|
|
|
out_no_data: |
|
if (is_remount_fc(fc)) { |
|
ctx->skip_reconfig_option_check = true; |
|
return 0; |
|
} |
|
return nfs_invalf(fc, "NFS: mount program didn't pass any mount data"); |
|
|
|
out_no_v3: |
|
return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3"); |
|
|
|
out_no_sec: |
|
return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS"); |
|
|
|
out_nomem: |
|
dfprintk(MOUNT, "NFS: not enough memory to handle mount options"); |
|
return -ENOMEM; |
|
|
|
out_no_address: |
|
return nfs_invalf(fc, "NFS: mount program didn't pass remote address"); |
|
|
|
out_invalid_fh: |
|
return nfs_invalf(fc, "NFS: invalid root filehandle"); |
|
|
|
out_invalid_data: |
|
return nfs_invalf(fc, "NFS: invalid binary mount data"); |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
struct compat_nfs_string { |
|
compat_uint_t len; |
|
compat_uptr_t data; |
|
}; |
|
|
|
static inline void compat_nfs_string(struct nfs_string *dst, |
|
struct compat_nfs_string *src) |
|
{ |
|
dst->data = compat_ptr(src->data); |
|
dst->len = src->len; |
|
} |
|
|
|
struct compat_nfs4_mount_data_v1 { |
|
compat_int_t version; |
|
compat_int_t flags; |
|
compat_int_t rsize; |
|
compat_int_t wsize; |
|
compat_int_t timeo; |
|
compat_int_t retrans; |
|
compat_int_t acregmin; |
|
compat_int_t acregmax; |
|
compat_int_t acdirmin; |
|
compat_int_t acdirmax; |
|
struct compat_nfs_string client_addr; |
|
struct compat_nfs_string mnt_path; |
|
struct compat_nfs_string hostname; |
|
compat_uint_t host_addrlen; |
|
compat_uptr_t host_addr; |
|
compat_int_t proto; |
|
compat_int_t auth_flavourlen; |
|
compat_uptr_t auth_flavours; |
|
}; |
|
|
|
static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data) |
|
{ |
|
struct compat_nfs4_mount_data_v1 *compat = |
|
(struct compat_nfs4_mount_data_v1 *)data; |
|
|
|
/* copy the fields backwards */ |
|
data->auth_flavours = compat_ptr(compat->auth_flavours); |
|
data->auth_flavourlen = compat->auth_flavourlen; |
|
data->proto = compat->proto; |
|
data->host_addr = compat_ptr(compat->host_addr); |
|
data->host_addrlen = compat->host_addrlen; |
|
compat_nfs_string(&data->hostname, &compat->hostname); |
|
compat_nfs_string(&data->mnt_path, &compat->mnt_path); |
|
compat_nfs_string(&data->client_addr, &compat->client_addr); |
|
data->acdirmax = compat->acdirmax; |
|
data->acdirmin = compat->acdirmin; |
|
data->acregmax = compat->acregmax; |
|
data->acregmin = compat->acregmin; |
|
data->retrans = compat->retrans; |
|
data->timeo = compat->timeo; |
|
data->wsize = compat->wsize; |
|
data->rsize = compat->rsize; |
|
data->flags = compat->flags; |
|
data->version = compat->version; |
|
} |
|
|
|
/* |
|
* Validate NFSv4 mount options |
|
*/ |
|
static int nfs4_parse_monolithic(struct fs_context *fc, |
|
struct nfs4_mount_data *data) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; |
|
char *c; |
|
|
|
if (!data) { |
|
if (is_remount_fc(fc)) |
|
goto done; |
|
return nfs_invalf(fc, |
|
"NFS4: mount program didn't pass any mount data"); |
|
} |
|
|
|
ctx->version = 4; |
|
|
|
if (data->version != 1) |
|
return generic_parse_monolithic(fc, data); |
|
|
|
if (in_compat_syscall()) |
|
nfs4_compat_mount_data_conv(data); |
|
|
|
if (data->host_addrlen > sizeof(ctx->nfs_server.address)) |
|
goto out_no_address; |
|
if (data->host_addrlen == 0) |
|
goto out_no_address; |
|
ctx->nfs_server.addrlen = data->host_addrlen; |
|
if (copy_from_user(sap, data->host_addr, data->host_addrlen)) |
|
return -EFAULT; |
|
if (!nfs_verify_server_address(sap)) |
|
goto out_no_address; |
|
ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); |
|
|
|
if (data->auth_flavourlen) { |
|
rpc_authflavor_t pseudoflavor; |
|
|
|
if (data->auth_flavourlen > 1) |
|
goto out_inval_auth; |
|
if (copy_from_user(&pseudoflavor, data->auth_flavours, |
|
sizeof(pseudoflavor))) |
|
return -EFAULT; |
|
ctx->selected_flavor = pseudoflavor; |
|
} else { |
|
ctx->selected_flavor = RPC_AUTH_UNIX; |
|
} |
|
|
|
c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); |
|
if (IS_ERR(c)) |
|
return PTR_ERR(c); |
|
ctx->nfs_server.hostname = c; |
|
|
|
c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); |
|
if (IS_ERR(c)) |
|
return PTR_ERR(c); |
|
ctx->nfs_server.export_path = c; |
|
dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); |
|
|
|
c = strndup_user(data->client_addr.data, 16); |
|
if (IS_ERR(c)) |
|
return PTR_ERR(c); |
|
ctx->client_address = c; |
|
|
|
/* |
|
* Translate to nfs_fs_context, which nfs_fill_super |
|
* can deal with. |
|
*/ |
|
|
|
ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK; |
|
ctx->rsize = data->rsize; |
|
ctx->wsize = data->wsize; |
|
ctx->timeo = data->timeo; |
|
ctx->retrans = data->retrans; |
|
ctx->acregmin = data->acregmin; |
|
ctx->acregmax = data->acregmax; |
|
ctx->acdirmin = data->acdirmin; |
|
ctx->acdirmax = data->acdirmax; |
|
ctx->nfs_server.protocol = data->proto; |
|
nfs_validate_transport_protocol(ctx); |
|
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP) |
|
goto out_invalid_transport_udp; |
|
done: |
|
ctx->skip_reconfig_option_check = true; |
|
return 0; |
|
|
|
out_inval_auth: |
|
return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d", |
|
data->auth_flavourlen); |
|
|
|
out_no_address: |
|
return nfs_invalf(fc, "NFS4: mount program didn't pass remote address"); |
|
|
|
out_invalid_transport_udp: |
|
return nfs_invalf(fc, "NFS: Unsupported transport protocol udp"); |
|
} |
|
#endif |
|
|
|
/* |
|
* Parse a monolithic block of data from sys_mount(). |
|
*/ |
|
static int nfs_fs_context_parse_monolithic(struct fs_context *fc, |
|
void *data) |
|
{ |
|
if (fc->fs_type == &nfs_fs_type) |
|
return nfs23_parse_monolithic(fc, data); |
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
if (fc->fs_type == &nfs4_fs_type) |
|
return nfs4_parse_monolithic(fc, data); |
|
#endif |
|
|
|
return nfs_invalf(fc, "NFS: Unsupported monolithic data version"); |
|
} |
|
|
|
/* |
|
* Validate the preparsed information in the config. |
|
*/ |
|
static int nfs_fs_context_validate(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
struct nfs_subversion *nfs_mod; |
|
struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; |
|
int max_namelen = PAGE_SIZE; |
|
int max_pathlen = NFS_MAXPATHLEN; |
|
int port = 0; |
|
int ret; |
|
|
|
if (!fc->source) |
|
goto out_no_device_name; |
|
|
|
/* Check for sanity first. */ |
|
if (ctx->minorversion && ctx->version != 4) |
|
goto out_minorversion_mismatch; |
|
|
|
if (ctx->options & NFS_OPTION_MIGRATION && |
|
(ctx->version != 4 || ctx->minorversion != 0)) |
|
goto out_migration_misuse; |
|
|
|
/* Verify that any proto=/mountproto= options match the address |
|
* families in the addr=/mountaddr= options. |
|
*/ |
|
if (ctx->protofamily != AF_UNSPEC && |
|
ctx->protofamily != ctx->nfs_server.address.sa_family) |
|
goto out_proto_mismatch; |
|
|
|
if (ctx->mountfamily != AF_UNSPEC) { |
|
if (ctx->mount_server.addrlen) { |
|
if (ctx->mountfamily != ctx->mount_server.address.sa_family) |
|
goto out_mountproto_mismatch; |
|
} else { |
|
if (ctx->mountfamily != ctx->nfs_server.address.sa_family) |
|
goto out_mountproto_mismatch; |
|
} |
|
} |
|
|
|
if (!nfs_verify_server_address(sap)) |
|
goto out_no_address; |
|
|
|
if (ctx->version == 4) { |
|
if (IS_ENABLED(CONFIG_NFS_V4)) { |
|
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA) |
|
port = NFS_RDMA_PORT; |
|
else |
|
port = NFS_PORT; |
|
max_namelen = NFS4_MAXNAMLEN; |
|
max_pathlen = NFS4_MAXPATHLEN; |
|
nfs_validate_transport_protocol(ctx); |
|
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP) |
|
goto out_invalid_transport_udp; |
|
ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL | |
|
NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK | |
|
NFS_MOUNT_LOCAL_FCNTL); |
|
} else { |
|
goto out_v4_not_compiled; |
|
} |
|
} else { |
|
nfs_set_mount_transport_protocol(ctx); |
|
#ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT |
|
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_UDP) |
|
goto out_invalid_transport_udp; |
|
#endif |
|
if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA) |
|
port = NFS_RDMA_PORT; |
|
} |
|
|
|
nfs_set_port(sap, &ctx->nfs_server.port, port); |
|
|
|
ret = nfs_parse_source(fc, max_namelen, max_pathlen); |
|
if (ret < 0) |
|
return ret; |
|
|
|
/* Load the NFS protocol module if we haven't done so yet */ |
|
if (!ctx->nfs_mod) { |
|
nfs_mod = get_nfs_version(ctx->version); |
|
if (IS_ERR(nfs_mod)) { |
|
ret = PTR_ERR(nfs_mod); |
|
goto out_version_unavailable; |
|
} |
|
ctx->nfs_mod = nfs_mod; |
|
} |
|
|
|
/* Ensure the filesystem context has the correct fs_type */ |
|
if (fc->fs_type != ctx->nfs_mod->nfs_fs) { |
|
module_put(fc->fs_type->owner); |
|
__module_get(ctx->nfs_mod->nfs_fs->owner); |
|
fc->fs_type = ctx->nfs_mod->nfs_fs; |
|
} |
|
return 0; |
|
|
|
out_no_device_name: |
|
return nfs_invalf(fc, "NFS: Device name not specified"); |
|
out_v4_not_compiled: |
|
nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel"); |
|
return -EPROTONOSUPPORT; |
|
out_invalid_transport_udp: |
|
return nfs_invalf(fc, "NFS: Unsupported transport protocol udp"); |
|
out_no_address: |
|
return nfs_invalf(fc, "NFS: mount program didn't pass remote address"); |
|
out_mountproto_mismatch: |
|
return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option"); |
|
out_proto_mismatch: |
|
return nfs_invalf(fc, "NFS: Server address does not match proto= option"); |
|
out_minorversion_mismatch: |
|
return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u", |
|
ctx->version, ctx->minorversion); |
|
out_migration_misuse: |
|
return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version"); |
|
out_version_unavailable: |
|
nfs_errorf(fc, "NFS: Version unavailable"); |
|
return ret; |
|
} |
|
|
|
/* |
|
* Create an NFS superblock by the appropriate method. |
|
*/ |
|
static int nfs_get_tree(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
int err = nfs_fs_context_validate(fc); |
|
|
|
if (err) |
|
return err; |
|
if (!ctx->internal) |
|
return ctx->nfs_mod->rpc_ops->try_get_tree(fc); |
|
else |
|
return nfs_get_tree_common(fc); |
|
} |
|
|
|
/* |
|
* Handle duplication of a configuration. The caller copied *src into *sc, but |
|
* it can't deal with resource pointers in the filesystem context, so we have |
|
* to do that. We need to clear pointers, copy data or get extra refs as |
|
* appropriate. |
|
*/ |
|
static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc) |
|
{ |
|
struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx; |
|
|
|
ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL); |
|
if (!ctx) |
|
return -ENOMEM; |
|
|
|
ctx->mntfh = nfs_alloc_fhandle(); |
|
if (!ctx->mntfh) { |
|
kfree(ctx); |
|
return -ENOMEM; |
|
} |
|
nfs_copy_fh(ctx->mntfh, src->mntfh); |
|
|
|
__module_get(ctx->nfs_mod->owner); |
|
ctx->client_address = NULL; |
|
ctx->mount_server.hostname = NULL; |
|
ctx->nfs_server.export_path = NULL; |
|
ctx->nfs_server.hostname = NULL; |
|
ctx->fscache_uniq = NULL; |
|
ctx->clone_data.fattr = NULL; |
|
fc->fs_private = ctx; |
|
return 0; |
|
} |
|
|
|
static void nfs_fs_context_free(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx = nfs_fc2context(fc); |
|
|
|
if (ctx) { |
|
if (ctx->server) |
|
nfs_free_server(ctx->server); |
|
if (ctx->nfs_mod) |
|
put_nfs_version(ctx->nfs_mod); |
|
kfree(ctx->client_address); |
|
kfree(ctx->mount_server.hostname); |
|
kfree(ctx->nfs_server.export_path); |
|
kfree(ctx->nfs_server.hostname); |
|
kfree(ctx->fscache_uniq); |
|
nfs_free_fhandle(ctx->mntfh); |
|
nfs_free_fattr(ctx->clone_data.fattr); |
|
kfree(ctx); |
|
} |
|
} |
|
|
|
static const struct fs_context_operations nfs_fs_context_ops = { |
|
.free = nfs_fs_context_free, |
|
.dup = nfs_fs_context_dup, |
|
.parse_param = nfs_fs_context_parse_param, |
|
.parse_monolithic = nfs_fs_context_parse_monolithic, |
|
.get_tree = nfs_get_tree, |
|
.reconfigure = nfs_reconfigure, |
|
}; |
|
|
|
/* |
|
* Prepare superblock configuration. We use the namespaces attached to the |
|
* context. This may be the current process's namespaces, or it may be a |
|
* container's namespaces. |
|
*/ |
|
static int nfs_init_fs_context(struct fs_context *fc) |
|
{ |
|
struct nfs_fs_context *ctx; |
|
|
|
ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL); |
|
if (unlikely(!ctx)) |
|
return -ENOMEM; |
|
|
|
ctx->mntfh = nfs_alloc_fhandle(); |
|
if (unlikely(!ctx->mntfh)) { |
|
kfree(ctx); |
|
return -ENOMEM; |
|
} |
|
|
|
ctx->protofamily = AF_UNSPEC; |
|
ctx->mountfamily = AF_UNSPEC; |
|
ctx->mount_server.port = NFS_UNSPEC_PORT; |
|
|
|
if (fc->root) { |
|
/* reconfigure, start with the current config */ |
|
struct nfs_server *nfss = fc->root->d_sb->s_fs_info; |
|
struct net *net = nfss->nfs_client->cl_net; |
|
|
|
ctx->flags = nfss->flags; |
|
ctx->rsize = nfss->rsize; |
|
ctx->wsize = nfss->wsize; |
|
ctx->retrans = nfss->client->cl_timeout->to_retries; |
|
ctx->selected_flavor = 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->nfs_server.port = nfss->port; |
|
ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; |
|
ctx->version = nfss->nfs_client->rpc_ops->version; |
|
ctx->minorversion = nfss->nfs_client->cl_minorversion; |
|
|
|
memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr, |
|
ctx->nfs_server.addrlen); |
|
|
|
if (fc->net_ns != net) { |
|
put_net(fc->net_ns); |
|
fc->net_ns = get_net(net); |
|
} |
|
|
|
ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod; |
|
__module_get(ctx->nfs_mod->owner); |
|
} else { |
|
/* defaults */ |
|
ctx->timeo = NFS_UNSPEC_TIMEO; |
|
ctx->retrans = NFS_UNSPEC_RETRANS; |
|
ctx->acregmin = NFS_DEF_ACREGMIN; |
|
ctx->acregmax = NFS_DEF_ACREGMAX; |
|
ctx->acdirmin = NFS_DEF_ACDIRMIN; |
|
ctx->acdirmax = NFS_DEF_ACDIRMAX; |
|
ctx->nfs_server.port = NFS_UNSPEC_PORT; |
|
ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP; |
|
ctx->selected_flavor = RPC_AUTH_MAXFLAVOR; |
|
ctx->minorversion = 0; |
|
ctx->need_mount = true; |
|
} |
|
fc->fs_private = ctx; |
|
fc->ops = &nfs_fs_context_ops; |
|
return 0; |
|
} |
|
|
|
struct file_system_type nfs_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "nfs", |
|
.init_fs_context = nfs_init_fs_context, |
|
.parameters = nfs_fs_parameters, |
|
.kill_sb = nfs_kill_super, |
|
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, |
|
}; |
|
MODULE_ALIAS_FS("nfs"); |
|
EXPORT_SYMBOL_GPL(nfs_fs_type); |
|
|
|
#if IS_ENABLED(CONFIG_NFS_V4) |
|
struct file_system_type nfs4_fs_type = { |
|
.owner = THIS_MODULE, |
|
.name = "nfs4", |
|
.init_fs_context = nfs_init_fs_context, |
|
.parameters = nfs_fs_parameters, |
|
.kill_sb = nfs_kill_super, |
|
.fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, |
|
}; |
|
MODULE_ALIAS_FS("nfs4"); |
|
MODULE_ALIAS("nfs4"); |
|
EXPORT_SYMBOL_GPL(nfs4_fs_type); |
|
#endif /* CONFIG_NFS_V4 */
|
|
|