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740 lines
16 KiB
740 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/fs/9p/v9fs.c |
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* |
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* This file contains functions assisting in mapping VFS to 9P2000 |
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* |
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* Copyright (C) 2004-2008 by Eric Van Hensbergen <[email protected]> |
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* Copyright (C) 2002 by Ron Minnich <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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#include <linux/module.h> |
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#include <linux/errno.h> |
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#include <linux/fs.h> |
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#include <linux/sched.h> |
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#include <linux/cred.h> |
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#include <linux/parser.h> |
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#include <linux/idr.h> |
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#include <linux/slab.h> |
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#include <linux/seq_file.h> |
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#include <net/9p/9p.h> |
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#include <net/9p/client.h> |
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#include <net/9p/transport.h> |
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#include "v9fs.h" |
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#include "v9fs_vfs.h" |
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#include "cache.h" |
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|
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static DEFINE_SPINLOCK(v9fs_sessionlist_lock); |
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static LIST_HEAD(v9fs_sessionlist); |
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struct kmem_cache *v9fs_inode_cache; |
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|
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/* |
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* Option Parsing (code inspired by NFS code) |
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* NOTE: each transport will parse its own options |
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*/ |
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enum { |
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/* Options that take integer arguments */ |
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Opt_debug, Opt_dfltuid, Opt_dfltgid, Opt_afid, |
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/* String options */ |
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Opt_uname, Opt_remotename, Opt_cache, Opt_cachetag, |
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/* Options that take no arguments */ |
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Opt_nodevmap, |
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/* Cache options */ |
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Opt_cache_loose, Opt_fscache, Opt_mmap, |
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/* Access options */ |
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Opt_access, Opt_posixacl, |
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/* Lock timeout option */ |
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Opt_locktimeout, |
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/* Error token */ |
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Opt_err |
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}; |
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|
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static const match_table_t tokens = { |
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{Opt_debug, "debug=%x"}, |
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{Opt_dfltuid, "dfltuid=%u"}, |
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{Opt_dfltgid, "dfltgid=%u"}, |
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{Opt_afid, "afid=%u"}, |
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{Opt_uname, "uname=%s"}, |
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{Opt_remotename, "aname=%s"}, |
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{Opt_nodevmap, "nodevmap"}, |
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{Opt_cache, "cache=%s"}, |
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{Opt_cache_loose, "loose"}, |
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{Opt_fscache, "fscache"}, |
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{Opt_mmap, "mmap"}, |
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{Opt_cachetag, "cachetag=%s"}, |
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{Opt_access, "access=%s"}, |
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{Opt_posixacl, "posixacl"}, |
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{Opt_locktimeout, "locktimeout=%u"}, |
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{Opt_err, NULL} |
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}; |
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static const char *const v9fs_cache_modes[nr__p9_cache_modes] = { |
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[CACHE_NONE] = "none", |
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[CACHE_MMAP] = "mmap", |
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[CACHE_LOOSE] = "loose", |
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[CACHE_FSCACHE] = "fscache", |
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}; |
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/* Interpret mount options for cache mode */ |
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static int get_cache_mode(char *s) |
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{ |
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int version = -EINVAL; |
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if (!strcmp(s, "loose")) { |
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version = CACHE_LOOSE; |
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p9_debug(P9_DEBUG_9P, "Cache mode: loose\n"); |
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} else if (!strcmp(s, "fscache")) { |
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version = CACHE_FSCACHE; |
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p9_debug(P9_DEBUG_9P, "Cache mode: fscache\n"); |
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} else if (!strcmp(s, "mmap")) { |
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version = CACHE_MMAP; |
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p9_debug(P9_DEBUG_9P, "Cache mode: mmap\n"); |
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} else if (!strcmp(s, "none")) { |
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version = CACHE_NONE; |
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p9_debug(P9_DEBUG_9P, "Cache mode: none\n"); |
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} else |
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pr_info("Unknown Cache mode %s\n", s); |
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return version; |
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} |
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/* |
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* Display the mount options in /proc/mounts. |
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*/ |
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int v9fs_show_options(struct seq_file *m, struct dentry *root) |
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{ |
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struct v9fs_session_info *v9ses = root->d_sb->s_fs_info; |
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if (v9ses->debug) |
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seq_printf(m, ",debug=%x", v9ses->debug); |
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if (!uid_eq(v9ses->dfltuid, V9FS_DEFUID)) |
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seq_printf(m, ",dfltuid=%u", |
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from_kuid_munged(&init_user_ns, v9ses->dfltuid)); |
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if (!gid_eq(v9ses->dfltgid, V9FS_DEFGID)) |
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seq_printf(m, ",dfltgid=%u", |
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from_kgid_munged(&init_user_ns, v9ses->dfltgid)); |
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if (v9ses->afid != ~0) |
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seq_printf(m, ",afid=%u", v9ses->afid); |
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if (strcmp(v9ses->uname, V9FS_DEFUSER) != 0) |
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seq_printf(m, ",uname=%s", v9ses->uname); |
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if (strcmp(v9ses->aname, V9FS_DEFANAME) != 0) |
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seq_printf(m, ",aname=%s", v9ses->aname); |
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if (v9ses->nodev) |
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seq_puts(m, ",nodevmap"); |
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if (v9ses->cache) |
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seq_printf(m, ",%s", v9fs_cache_modes[v9ses->cache]); |
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#ifdef CONFIG_9P_FSCACHE |
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if (v9ses->cachetag && v9ses->cache == CACHE_FSCACHE) |
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seq_printf(m, ",cachetag=%s", v9ses->cachetag); |
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#endif |
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switch (v9ses->flags & V9FS_ACCESS_MASK) { |
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case V9FS_ACCESS_USER: |
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seq_puts(m, ",access=user"); |
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break; |
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case V9FS_ACCESS_ANY: |
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seq_puts(m, ",access=any"); |
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break; |
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case V9FS_ACCESS_CLIENT: |
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seq_puts(m, ",access=client"); |
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break; |
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case V9FS_ACCESS_SINGLE: |
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seq_printf(m, ",access=%u", |
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from_kuid_munged(&init_user_ns, v9ses->uid)); |
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break; |
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} |
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if (v9ses->flags & V9FS_POSIX_ACL) |
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seq_puts(m, ",posixacl"); |
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return p9_show_client_options(m, v9ses->clnt); |
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} |
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/** |
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* v9fs_parse_options - parse mount options into session structure |
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* @v9ses: existing v9fs session information |
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* |
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* Return 0 upon success, -ERRNO upon failure. |
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*/ |
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static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts) |
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{ |
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char *options, *tmp_options; |
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substring_t args[MAX_OPT_ARGS]; |
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char *p; |
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int option = 0; |
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char *s, *e; |
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int ret = 0; |
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|
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/* setup defaults */ |
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v9ses->afid = ~0; |
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v9ses->debug = 0; |
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v9ses->cache = CACHE_NONE; |
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#ifdef CONFIG_9P_FSCACHE |
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v9ses->cachetag = NULL; |
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#endif |
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v9ses->session_lock_timeout = P9_LOCK_TIMEOUT; |
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if (!opts) |
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return 0; |
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tmp_options = kstrdup(opts, GFP_KERNEL); |
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if (!tmp_options) { |
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ret = -ENOMEM; |
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goto fail_option_alloc; |
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} |
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options = tmp_options; |
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while ((p = strsep(&options, ",")) != NULL) { |
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int token, r; |
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if (!*p) |
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continue; |
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token = match_token(p, tokens, args); |
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switch (token) { |
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case Opt_debug: |
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r = match_int(&args[0], &option); |
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if (r < 0) { |
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p9_debug(P9_DEBUG_ERROR, |
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"integer field, but no integer?\n"); |
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ret = r; |
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} else { |
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v9ses->debug = option; |
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#ifdef CONFIG_NET_9P_DEBUG |
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p9_debug_level = option; |
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#endif |
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} |
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break; |
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|
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case Opt_dfltuid: |
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r = match_int(&args[0], &option); |
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if (r < 0) { |
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p9_debug(P9_DEBUG_ERROR, |
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"integer field, but no integer?\n"); |
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ret = r; |
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continue; |
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} |
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v9ses->dfltuid = make_kuid(current_user_ns(), option); |
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if (!uid_valid(v9ses->dfltuid)) { |
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p9_debug(P9_DEBUG_ERROR, |
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"uid field, but not a uid?\n"); |
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ret = -EINVAL; |
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} |
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break; |
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case Opt_dfltgid: |
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r = match_int(&args[0], &option); |
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if (r < 0) { |
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p9_debug(P9_DEBUG_ERROR, |
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"integer field, but no integer?\n"); |
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ret = r; |
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continue; |
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} |
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v9ses->dfltgid = make_kgid(current_user_ns(), option); |
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if (!gid_valid(v9ses->dfltgid)) { |
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p9_debug(P9_DEBUG_ERROR, |
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"gid field, but not a gid?\n"); |
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ret = -EINVAL; |
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} |
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break; |
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case Opt_afid: |
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r = match_int(&args[0], &option); |
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if (r < 0) { |
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p9_debug(P9_DEBUG_ERROR, |
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"integer field, but no integer?\n"); |
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ret = r; |
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} else { |
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v9ses->afid = option; |
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} |
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break; |
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case Opt_uname: |
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kfree(v9ses->uname); |
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v9ses->uname = match_strdup(&args[0]); |
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if (!v9ses->uname) { |
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ret = -ENOMEM; |
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goto free_and_return; |
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} |
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break; |
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case Opt_remotename: |
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kfree(v9ses->aname); |
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v9ses->aname = match_strdup(&args[0]); |
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if (!v9ses->aname) { |
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ret = -ENOMEM; |
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goto free_and_return; |
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} |
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break; |
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case Opt_nodevmap: |
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v9ses->nodev = 1; |
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break; |
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case Opt_cache_loose: |
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v9ses->cache = CACHE_LOOSE; |
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break; |
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case Opt_fscache: |
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v9ses->cache = CACHE_FSCACHE; |
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break; |
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case Opt_mmap: |
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v9ses->cache = CACHE_MMAP; |
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break; |
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case Opt_cachetag: |
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#ifdef CONFIG_9P_FSCACHE |
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kfree(v9ses->cachetag); |
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v9ses->cachetag = match_strdup(&args[0]); |
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if (!v9ses->cachetag) { |
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ret = -ENOMEM; |
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goto free_and_return; |
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} |
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#endif |
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break; |
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case Opt_cache: |
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s = match_strdup(&args[0]); |
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if (!s) { |
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ret = -ENOMEM; |
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p9_debug(P9_DEBUG_ERROR, |
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"problem allocating copy of cache arg\n"); |
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goto free_and_return; |
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} |
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r = get_cache_mode(s); |
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if (r < 0) |
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ret = r; |
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else |
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v9ses->cache = r; |
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kfree(s); |
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break; |
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case Opt_access: |
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s = match_strdup(&args[0]); |
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if (!s) { |
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ret = -ENOMEM; |
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p9_debug(P9_DEBUG_ERROR, |
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"problem allocating copy of access arg\n"); |
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goto free_and_return; |
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} |
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v9ses->flags &= ~V9FS_ACCESS_MASK; |
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if (strcmp(s, "user") == 0) |
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v9ses->flags |= V9FS_ACCESS_USER; |
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else if (strcmp(s, "any") == 0) |
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v9ses->flags |= V9FS_ACCESS_ANY; |
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else if (strcmp(s, "client") == 0) { |
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v9ses->flags |= V9FS_ACCESS_CLIENT; |
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} else { |
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uid_t uid; |
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v9ses->flags |= V9FS_ACCESS_SINGLE; |
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uid = simple_strtoul(s, &e, 10); |
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if (*e != '\0') { |
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ret = -EINVAL; |
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pr_info("Unknown access argument %s\n", |
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s); |
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kfree(s); |
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continue; |
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} |
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v9ses->uid = make_kuid(current_user_ns(), uid); |
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if (!uid_valid(v9ses->uid)) { |
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ret = -EINVAL; |
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pr_info("Unknown uid %s\n", s); |
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} |
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} |
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kfree(s); |
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break; |
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case Opt_posixacl: |
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#ifdef CONFIG_9P_FS_POSIX_ACL |
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v9ses->flags |= V9FS_POSIX_ACL; |
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#else |
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p9_debug(P9_DEBUG_ERROR, |
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"Not defined CONFIG_9P_FS_POSIX_ACL. Ignoring posixacl option\n"); |
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#endif |
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break; |
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|
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case Opt_locktimeout: |
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r = match_int(&args[0], &option); |
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if (r < 0) { |
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p9_debug(P9_DEBUG_ERROR, |
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"integer field, but no integer?\n"); |
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ret = r; |
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continue; |
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} |
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if (option < 1) { |
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p9_debug(P9_DEBUG_ERROR, |
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"locktimeout must be a greater than zero integer.\n"); |
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ret = -EINVAL; |
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continue; |
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} |
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v9ses->session_lock_timeout = (long)option * HZ; |
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break; |
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default: |
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continue; |
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} |
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} |
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free_and_return: |
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kfree(tmp_options); |
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fail_option_alloc: |
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return ret; |
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} |
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/** |
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* v9fs_session_init - initialize session |
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* @v9ses: session information structure |
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* @dev_name: device being mounted |
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* @data: options |
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* |
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*/ |
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struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, |
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const char *dev_name, char *data) |
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{ |
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struct p9_fid *fid; |
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int rc = -ENOMEM; |
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v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL); |
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if (!v9ses->uname) |
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goto err_names; |
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v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL); |
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if (!v9ses->aname) |
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goto err_names; |
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init_rwsem(&v9ses->rename_sem); |
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v9ses->uid = INVALID_UID; |
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v9ses->dfltuid = V9FS_DEFUID; |
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v9ses->dfltgid = V9FS_DEFGID; |
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v9ses->clnt = p9_client_create(dev_name, data); |
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if (IS_ERR(v9ses->clnt)) { |
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rc = PTR_ERR(v9ses->clnt); |
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p9_debug(P9_DEBUG_ERROR, "problem initializing 9p client\n"); |
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goto err_names; |
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} |
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v9ses->flags = V9FS_ACCESS_USER; |
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if (p9_is_proto_dotl(v9ses->clnt)) { |
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v9ses->flags = V9FS_ACCESS_CLIENT; |
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v9ses->flags |= V9FS_PROTO_2000L; |
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} else if (p9_is_proto_dotu(v9ses->clnt)) { |
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v9ses->flags |= V9FS_PROTO_2000U; |
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} |
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rc = v9fs_parse_options(v9ses, data); |
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if (rc < 0) |
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goto err_clnt; |
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v9ses->maxdata = v9ses->clnt->msize - P9_IOHDRSZ; |
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if (!v9fs_proto_dotl(v9ses) && |
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((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
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/* |
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* We support ACCESS_CLIENT only for dotl. |
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* Fall back to ACCESS_USER |
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*/ |
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v9ses->flags &= ~V9FS_ACCESS_MASK; |
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v9ses->flags |= V9FS_ACCESS_USER; |
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} |
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/*FIXME !! */ |
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/* for legacy mode, fall back to V9FS_ACCESS_ANY */ |
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if (!(v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) && |
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((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { |
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|
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v9ses->flags &= ~V9FS_ACCESS_MASK; |
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v9ses->flags |= V9FS_ACCESS_ANY; |
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v9ses->uid = INVALID_UID; |
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} |
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if (!v9fs_proto_dotl(v9ses) || |
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!((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_CLIENT)) { |
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/* |
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* We support ACL checks on clinet only if the protocol is |
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* 9P2000.L and access is V9FS_ACCESS_CLIENT. |
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*/ |
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v9ses->flags &= ~V9FS_ACL_MASK; |
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} |
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|
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fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, INVALID_UID, |
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v9ses->aname); |
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if (IS_ERR(fid)) { |
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rc = PTR_ERR(fid); |
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p9_debug(P9_DEBUG_ERROR, "cannot attach\n"); |
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goto err_clnt; |
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} |
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if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) |
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fid->uid = v9ses->uid; |
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else |
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fid->uid = INVALID_UID; |
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|
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#ifdef CONFIG_9P_FSCACHE |
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/* register the session for caching */ |
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v9fs_cache_session_get_cookie(v9ses); |
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#endif |
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spin_lock(&v9fs_sessionlist_lock); |
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list_add(&v9ses->slist, &v9fs_sessionlist); |
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spin_unlock(&v9fs_sessionlist_lock); |
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|
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return fid; |
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|
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err_clnt: |
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#ifdef CONFIG_9P_FSCACHE |
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kfree(v9ses->cachetag); |
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#endif |
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p9_client_destroy(v9ses->clnt); |
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err_names: |
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kfree(v9ses->uname); |
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kfree(v9ses->aname); |
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return ERR_PTR(rc); |
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} |
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|
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/** |
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* v9fs_session_close - shutdown a session |
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* @v9ses: session information structure |
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* |
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*/ |
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|
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void v9fs_session_close(struct v9fs_session_info *v9ses) |
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{ |
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if (v9ses->clnt) { |
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p9_client_destroy(v9ses->clnt); |
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v9ses->clnt = NULL; |
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} |
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|
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#ifdef CONFIG_9P_FSCACHE |
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if (v9ses->fscache) |
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v9fs_cache_session_put_cookie(v9ses); |
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kfree(v9ses->cachetag); |
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#endif |
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kfree(v9ses->uname); |
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kfree(v9ses->aname); |
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|
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spin_lock(&v9fs_sessionlist_lock); |
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list_del(&v9ses->slist); |
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spin_unlock(&v9fs_sessionlist_lock); |
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} |
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|
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/** |
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* v9fs_session_cancel - terminate a session |
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* @v9ses: session to terminate |
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* |
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* mark transport as disconnected and cancel all pending requests. |
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*/ |
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|
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void v9fs_session_cancel(struct v9fs_session_info *v9ses) { |
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p9_debug(P9_DEBUG_ERROR, "cancel session %p\n", v9ses); |
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p9_client_disconnect(v9ses->clnt); |
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} |
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|
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/** |
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* v9fs_session_begin_cancel - Begin terminate of a session |
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* @v9ses: session to terminate |
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* |
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* After this call we don't allow any request other than clunk. |
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*/ |
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|
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void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses) |
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{ |
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p9_debug(P9_DEBUG_ERROR, "begin cancel session %p\n", v9ses); |
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p9_client_begin_disconnect(v9ses->clnt); |
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} |
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|
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extern int v9fs_error_init(void); |
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|
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static struct kobject *v9fs_kobj; |
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|
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#ifdef CONFIG_9P_FSCACHE |
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/** |
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* caches_show - list caches associated with a session |
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* |
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* Returns the size of buffer written. |
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*/ |
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|
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static ssize_t caches_show(struct kobject *kobj, |
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struct kobj_attribute *attr, |
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char *buf) |
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{ |
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ssize_t n = 0, count = 0, limit = PAGE_SIZE; |
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struct v9fs_session_info *v9ses; |
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|
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spin_lock(&v9fs_sessionlist_lock); |
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list_for_each_entry(v9ses, &v9fs_sessionlist, slist) { |
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if (v9ses->cachetag) { |
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n = snprintf(buf, limit, "%s\n", v9ses->cachetag); |
|
if (n < 0) { |
|
count = n; |
|
break; |
|
} |
|
|
|
count += n; |
|
limit -= n; |
|
} |
|
} |
|
|
|
spin_unlock(&v9fs_sessionlist_lock); |
|
return count; |
|
} |
|
|
|
static struct kobj_attribute v9fs_attr_cache = __ATTR_RO(caches); |
|
#endif /* CONFIG_9P_FSCACHE */ |
|
|
|
static struct attribute *v9fs_attrs[] = { |
|
#ifdef CONFIG_9P_FSCACHE |
|
&v9fs_attr_cache.attr, |
|
#endif |
|
NULL, |
|
}; |
|
|
|
static struct attribute_group v9fs_attr_group = { |
|
.attrs = v9fs_attrs, |
|
}; |
|
|
|
/** |
|
* v9fs_sysfs_init - Initialize the v9fs sysfs interface |
|
* |
|
*/ |
|
|
|
static int __init v9fs_sysfs_init(void) |
|
{ |
|
v9fs_kobj = kobject_create_and_add("9p", fs_kobj); |
|
if (!v9fs_kobj) |
|
return -ENOMEM; |
|
|
|
if (sysfs_create_group(v9fs_kobj, &v9fs_attr_group)) { |
|
kobject_put(v9fs_kobj); |
|
return -ENOMEM; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* v9fs_sysfs_cleanup - Unregister the v9fs sysfs interface |
|
* |
|
*/ |
|
|
|
static void v9fs_sysfs_cleanup(void) |
|
{ |
|
sysfs_remove_group(v9fs_kobj, &v9fs_attr_group); |
|
kobject_put(v9fs_kobj); |
|
} |
|
|
|
static void v9fs_inode_init_once(void *foo) |
|
{ |
|
struct v9fs_inode *v9inode = (struct v9fs_inode *)foo; |
|
#ifdef CONFIG_9P_FSCACHE |
|
v9inode->fscache = NULL; |
|
#endif |
|
memset(&v9inode->qid, 0, sizeof(v9inode->qid)); |
|
inode_init_once(&v9inode->vfs_inode); |
|
} |
|
|
|
/** |
|
* v9fs_init_inode_cache - initialize a cache for 9P |
|
* Returns 0 on success. |
|
*/ |
|
static int v9fs_init_inode_cache(void) |
|
{ |
|
v9fs_inode_cache = kmem_cache_create("v9fs_inode_cache", |
|
sizeof(struct v9fs_inode), |
|
0, (SLAB_RECLAIM_ACCOUNT| |
|
SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
|
v9fs_inode_init_once); |
|
if (!v9fs_inode_cache) |
|
return -ENOMEM; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* v9fs_destroy_inode_cache - destroy the cache of 9P inode |
|
* |
|
*/ |
|
static void v9fs_destroy_inode_cache(void) |
|
{ |
|
/* |
|
* Make sure all delayed rcu free inodes are flushed before we |
|
* destroy cache. |
|
*/ |
|
rcu_barrier(); |
|
kmem_cache_destroy(v9fs_inode_cache); |
|
} |
|
|
|
static int v9fs_cache_register(void) |
|
{ |
|
int ret; |
|
ret = v9fs_init_inode_cache(); |
|
if (ret < 0) |
|
return ret; |
|
#ifdef CONFIG_9P_FSCACHE |
|
ret = fscache_register_netfs(&v9fs_cache_netfs); |
|
if (ret < 0) |
|
v9fs_destroy_inode_cache(); |
|
#endif |
|
return ret; |
|
} |
|
|
|
static void v9fs_cache_unregister(void) |
|
{ |
|
v9fs_destroy_inode_cache(); |
|
#ifdef CONFIG_9P_FSCACHE |
|
fscache_unregister_netfs(&v9fs_cache_netfs); |
|
#endif |
|
} |
|
|
|
/** |
|
* init_v9fs - Initialize module |
|
* |
|
*/ |
|
|
|
static int __init init_v9fs(void) |
|
{ |
|
int err; |
|
pr_info("Installing v9fs 9p2000 file system support\n"); |
|
/* TODO: Setup list of registered trasnport modules */ |
|
|
|
err = v9fs_cache_register(); |
|
if (err < 0) { |
|
pr_err("Failed to register v9fs for caching\n"); |
|
return err; |
|
} |
|
|
|
err = v9fs_sysfs_init(); |
|
if (err < 0) { |
|
pr_err("Failed to register with sysfs\n"); |
|
goto out_cache; |
|
} |
|
err = register_filesystem(&v9fs_fs_type); |
|
if (err < 0) { |
|
pr_err("Failed to register filesystem\n"); |
|
goto out_sysfs_cleanup; |
|
} |
|
|
|
return 0; |
|
|
|
out_sysfs_cleanup: |
|
v9fs_sysfs_cleanup(); |
|
|
|
out_cache: |
|
v9fs_cache_unregister(); |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* exit_v9fs - shutdown module |
|
* |
|
*/ |
|
|
|
static void __exit exit_v9fs(void) |
|
{ |
|
v9fs_sysfs_cleanup(); |
|
v9fs_cache_unregister(); |
|
unregister_filesystem(&v9fs_fs_type); |
|
} |
|
|
|
module_init(init_v9fs) |
|
module_exit(exit_v9fs) |
|
|
|
MODULE_AUTHOR("Latchesar Ionkov <[email protected]>"); |
|
MODULE_AUTHOR("Eric Van Hensbergen <[email protected]>"); |
|
MODULE_AUTHOR("Ron Minnich <[email protected]>"); |
|
MODULE_LICENSE("GPL");
|
|
|