diff options
| -rw-r--r-- | Documentation/filesystems/9p.txt | 10 | ||||
| -rw-r--r-- | fs/9p/fid.c | 157 | ||||
| -rw-r--r-- | fs/9p/v9fs.c | 67 | ||||
| -rw-r--r-- | fs/9p/v9fs.h | 11 | ||||
| -rw-r--r-- | fs/9p/vfs_inode.c | 20 | ||||
| -rw-r--r-- | include/net/9p/9p.h | 7 | ||||
| -rw-r--r-- | include/net/9p/client.h | 5 | ||||
| -rw-r--r-- | net/9p/client.c | 10 | ||||
| -rw-r--r-- | net/9p/conv.c | 32 |
9 files changed, 247 insertions, 72 deletions
diff --git a/Documentation/filesystems/9p.txt b/Documentation/filesystems/9p.txt index e694cd1..d6fd6c6 100644 --- a/Documentation/filesystems/9p.txt +++ b/Documentation/filesystems/9p.txt @@ -88,6 +88,16 @@ OPTIONS This can be used to share devices/named pipes/sockets between hosts. This functionality will be expanded in later versions. + access there are three access modes. + user = if a user tries to access a file on v9fs + filesystem for the first time, v9fs sends an + attach command (Tattach) for that user. + This is the default mode. + <uid> = allows only user with uid=<uid> to access + the files on the mounted filesystem + any = v9fs does single attach and performs all + operations as one user + RESOURCES ========= diff --git a/fs/9p/fid.c b/fs/9p/fid.c index 15e05a1..b364da7 100644 --- a/fs/9p/fid.c +++ b/fs/9p/fid.c @@ -1,6 +1,7 @@ /* * V9FS FID Management * + * Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> * Copyright (C) 2005, 2006 by Eric Van Hensbergen <ericvh@gmail.com> * * This program is free software; you can redistribute it and/or modify @@ -34,9 +35,9 @@ #include "fid.h" /** - * v9fs_fid_insert - add a fid to a dentry + * v9fs_fid_add - add a fid to a dentry + * @dentry: dentry that the fid is being added to * @fid: fid to add - * @dentry: dentry that it is being added to * */ @@ -66,52 +67,144 @@ int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) } /** - * v9fs_fid_lookup - return a locked fid from a dentry + * v9fs_fid_find - retrieve a fid that belongs to the specified uid * @dentry: dentry to look for fid in - * - * find a fid in the dentry, obtain its semaphore and return a reference to it. - * code calling lookup is responsible for releasing lock - * - * TODO: only match fids that have the same uid as current user + * @uid: return fid that belongs to the specified user + * @any: if non-zero, return any fid associated with the dentry * */ -struct p9_fid *v9fs_fid_lookup(struct dentry *dentry) +static struct p9_fid *v9fs_fid_find(struct dentry *dentry, u32 uid, int any) { struct v9fs_dentry *dent; - struct p9_fid *fid; - - P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); - dent = dentry->d_fsdata; - if (dent) - fid = list_entry(dent->fidlist.next, struct p9_fid, dlist); - else - fid = ERR_PTR(-EBADF); + struct p9_fid *fid, *ret; + + P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p) uid %d any %d\n", + dentry->d_iname, dentry, uid, any); + dent = (struct v9fs_dentry *) dentry->d_fsdata; + ret = NULL; + if (dent) { + spin_lock(&dent->lock); + list_for_each_entry(fid, &dent->fidlist, dlist) { + if (any || fid->uid == uid) { + ret = fid; + break; + } + } + spin_unlock(&dent->lock); + } - P9_DPRINTK(P9_DEBUG_VFS, " fid: %p\n", fid); - return fid; + return ret; } /** - * v9fs_fid_clone - lookup the fid for a dentry, clone a private copy and - * release it + * v9fs_fid_lookup - lookup for a fid, try to walk if not found * @dentry: dentry to look for fid in * - * find a fid in the dentry and then clone to a new private fid - * - * TODO: only match fids that have the same uid as current user - * + * Look for a fid in the specified dentry for the current user. + * If no fid is found, try to create one walking from a fid from the parent + * dentry (if it has one), or the root dentry. If the user haven't accessed + * the fs yet, attach now and walk from the root. */ -struct p9_fid *v9fs_fid_clone(struct dentry *dentry) +struct p9_fid *v9fs_fid_lookup(struct dentry *dentry) { - struct p9_fid *ofid, *fid; + int i, n, l, clone, any, access; + u32 uid; + struct p9_fid *fid; + struct dentry *d, *ds; + struct v9fs_session_info *v9ses; + char **wnames, *uname; + + v9ses = v9fs_inode2v9ses(dentry->d_inode); + access = v9ses->flags & V9FS_ACCESS_MASK; + switch (access) { + case V9FS_ACCESS_SINGLE: + case V9FS_ACCESS_USER: + uid = current->fsuid; + any = 0; + break; + + case V9FS_ACCESS_ANY: + uid = v9ses->uid; + any = 1; + break; + + default: + uid = ~0; + any = 0; + break; + } - P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); - ofid = v9fs_fid_lookup(dentry); - if (IS_ERR(ofid)) - return ofid; + fid = v9fs_fid_find(dentry, uid, any); + if (fid) + return fid; + + ds = dentry->d_parent; + fid = v9fs_fid_find(ds, uid, any); + if (!fid) { /* walk from the root */ + n = 0; + for (ds = dentry; !IS_ROOT(ds); ds = ds->d_parent) + n++; + + fid = v9fs_fid_find(ds, uid, any); + if (!fid) { /* the user is not attached to the fs yet */ + if (access == V9FS_ACCESS_SINGLE) + return ERR_PTR(-EPERM); + + if (v9fs_extended(v9ses)) + uname = NULL; + else + uname = v9ses->uname; + + fid = p9_client_attach(v9ses->clnt, NULL, uname, uid, + v9ses->aname); + + if (IS_ERR(fid)) + return fid; + + v9fs_fid_add(ds, fid); + } + } else /* walk from the parent */ + n = 1; + + if (ds == dentry) + return fid; + + wnames = kmalloc(sizeof(char *) * n, GFP_KERNEL); + if (!wnames) + return ERR_PTR(-ENOMEM); + + for (d = dentry, i = n; i >= 0; i--, d = d->d_parent) + wnames[i] = (char *) d->d_name.name; + + clone = 1; + i = 0; + while (i < n) { + l = min(n - i, P9_MAXWELEM); + fid = p9_client_walk(fid, l, &wnames[i], clone); + if (!fid) { + kfree(wnames); + return fid; + } + + i += l; + clone = 0; + } - fid = p9_client_walk(ofid, 0, NULL, 1); + kfree(wnames); + v9fs_fid_add(dentry, fid); return fid; } + +struct p9_fid *v9fs_fid_clone(struct dentry *dentry) +{ + struct p9_fid *fid, *ret; + + fid = v9fs_fid_lookup(dentry); + if (IS_ERR(fid)) + return fid; + + ret = p9_client_walk(fid, 0, NULL, 1); + return ret; +} diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c index 68f82be..89ee0ba 100644 --- a/fs/9p/v9fs.c +++ b/fs/9p/v9fs.c @@ -91,6 +91,8 @@ enum { Opt_legacy, Opt_nodevmap, /* Cache options */ Opt_cache_loose, + /* Access options */ + Opt_access, /* Error token */ Opt_err }; @@ -108,6 +110,7 @@ static match_table_t tokens = { {Opt_nodevmap, "nodevmap"}, {Opt_cache_loose, "cache=loose"}, {Opt_cache_loose, "loose"}, + {Opt_access, "access=%s"}, {Opt_err, NULL} }; @@ -125,10 +128,10 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses) char *p; int option; int ret; + char *s, *e; /* setup defaults */ v9ses->maxdata = 8192; - v9ses->flags = V9FS_EXTENDED; v9ses->afid = ~0; v9ses->debug = 0; v9ses->cache = 0; @@ -172,10 +175,10 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses) v9ses->trans = v9fs_match_trans(&args[0]); break; case Opt_uname: - match_strcpy(v9ses->name, &args[0]); + match_strcpy(v9ses->uname, &args[0]); break; case Opt_remotename: - match_strcpy(v9ses->remotename, &args[0]); + match_strcpy(v9ses->aname, &args[0]); break; case Opt_legacy: v9ses->flags &= ~V9FS_EXTENDED; @@ -186,6 +189,22 @@ static void v9fs_parse_options(struct v9fs_session_info *v9ses) case Opt_cache_loose: v9ses->cache = CACHE_LOOSE; break; + + case Opt_access: + s = match_strdup(&args[0]); + v9ses->flags &= ~V9FS_ACCESS_MASK; + if (strcmp(s, "user") == 0) + v9ses->flags |= V9FS_ACCESS_USER; + else if (strcmp(s, "any") == 0) + v9ses->flags |= V9FS_ACCESS_ANY; + else { + v9ses->flags |= V9FS_ACCESS_SINGLE; + v9ses->uid = simple_strtol(s, &e, 10); + if (*e != '\0') + v9ses->uid = ~0; + } + break; + default: continue; } @@ -207,21 +226,22 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, struct p9_trans *trans = NULL; struct p9_fid *fid; - v9ses->name = __getname(); - if (!v9ses->name) + v9ses->uname = __getname(); + if (!v9ses->uname) return ERR_PTR(-ENOMEM); - v9ses->remotename = __getname(); - if (!v9ses->remotename) { - __putname(v9ses->name); + v9ses->aname = __getname(); + if (!v9ses->aname) { + __putname(v9ses->uname); return ERR_PTR(-ENOMEM); } - strcpy(v9ses->name, V9FS_DEFUSER); - strcpy(v9ses->remotename, V9FS_DEFANAME); + v9ses->flags = V9FS_EXTENDED | V9FS_ACCESS_USER; + strcpy(v9ses->uname, V9FS_DEFUSER); + strcpy(v9ses->aname, V9FS_DEFANAME); + v9ses->uid = ~0; v9ses->dfltuid = V9FS_DEFUID; v9ses->dfltgid = V9FS_DEFGID; - v9ses->options = kstrdup(data, GFP_KERNEL); v9fs_parse_options(v9ses); @@ -255,8 +275,20 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, goto error; } - fid = p9_client_attach(v9ses->clnt, NULL, v9ses->name, - v9ses->remotename); + if (!v9ses->clnt->dotu) + v9ses->flags &= ~V9FS_EXTENDED; + + /* for legacy mode, fall back to V9FS_ACCESS_ANY */ + if (!v9fs_extended(v9ses) && + ((v9ses->flags&V9FS_ACCESS_MASK) == V9FS_ACCESS_USER)) { + + v9ses->flags &= ~V9FS_ACCESS_MASK; + v9ses->flags |= V9FS_ACCESS_ANY; + v9ses->uid = ~0; + } + + fid = p9_client_attach(v9ses->clnt, NULL, v9ses->uname, ~0, + v9ses->aname); if (IS_ERR(fid)) { retval = PTR_ERR(fid); fid = NULL; @@ -264,6 +296,11 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses, goto error; } + if ((v9ses->flags & V9FS_ACCESS_MASK) == V9FS_ACCESS_SINGLE) + fid->uid = v9ses->uid; + else + fid->uid = ~0; + return fid; error: @@ -284,8 +321,8 @@ void v9fs_session_close(struct v9fs_session_info *v9ses) v9ses->clnt = NULL; } - __putname(v9ses->name); - __putname(v9ses->remotename); + __putname(v9ses->uname); + __putname(v9ses->aname); kfree(v9ses->options); } diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h index 8e0999b..db4b419 100644 --- a/fs/9p/v9fs.h +++ b/fs/9p/v9fs.h @@ -36,10 +36,11 @@ struct v9fs_session_info { unsigned int cache; /* cache mode */ char *options; /* copy of mount options */ - char *name; /* user name to mount as */ - char *remotename; /* name of remote hierarchy being mounted */ + char *uname; /* user name to mount as */ + char *aname; /* name of remote hierarchy being mounted */ unsigned int dfltuid; /* default uid/muid for legacy support */ unsigned int dfltgid; /* default gid for legacy support */ + u32 uid; /* if ACCESS_SINGLE, the uid that has access */ struct p9_trans_module *trans; /* 9p transport */ struct p9_client *clnt; /* 9p client */ struct dentry *debugfs_dir; @@ -47,7 +48,11 @@ struct v9fs_session_info { /* session flags */ enum { - V9FS_EXTENDED, + V9FS_EXTENDED = 0x01, /* 9P2000.u */ + V9FS_ACCESS_MASK = 0x06, /* access mask */ + V9FS_ACCESS_SINGLE = 0x02, /* only one user can access the files */ + V9FS_ACCESS_USER = 0x04, /* attache per user */ + V9FS_ACCESS_ANY = 0x06, /* use the same attach for all users */ }; /* possible values of ->cache */ diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c index f08a35d..175b4d9 100644 --- a/fs/9p/vfs_inode.c +++ b/fs/9p/vfs_inode.c @@ -364,7 +364,7 @@ static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) file_inode = file->d_inode; v9ses = v9fs_inode2v9ses(file_inode); v9fid = v9fs_fid_clone(file); - if(IS_ERR(v9fid)) + if (IS_ERR(v9fid)) return PTR_ERR(v9fid); return p9_client_remove(v9fid); @@ -398,7 +398,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, fid = NULL; name = (char *) dentry->d_name.name; dfid = v9fs_fid_clone(dentry->d_parent); - if(IS_ERR(dfid)) { + if (IS_ERR(dfid)) { err = PTR_ERR(dfid); dfid = NULL; goto error; @@ -432,7 +432,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, goto error; } - if(v9ses->cache) + if (v9ses->cache) dentry->d_op = &v9fs_cached_dentry_operations; else dentry->d_op = &v9fs_dentry_operations; @@ -593,7 +593,7 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, if (result < 0) goto error; - if((fid->qid.version)&&(v9ses->cache)) + if ((fid->qid.version) && (v9ses->cache)) dentry->d_op = &v9fs_cached_dentry_operations; else dentry->d_op = &v9fs_dentry_operations; @@ -658,17 +658,17 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, old_inode = old_dentry->d_inode; v9ses = v9fs_inode2v9ses(old_inode); oldfid = v9fs_fid_lookup(old_dentry); - if(IS_ERR(oldfid)) + if (IS_ERR(oldfid)) return PTR_ERR(oldfid); olddirfid = v9fs_fid_clone(old_dentry->d_parent); - if(IS_ERR(olddirfid)) { + if (IS_ERR(olddirfid)) { retval = PTR_ERR(olddirfid); goto done; } newdirfid = v9fs_fid_clone(new_dentry->d_parent); - if(IS_ERR(newdirfid)) { + if (IS_ERR(newdirfid)) { retval = PTR_ERR(newdirfid); goto clunk_olddir; } @@ -682,7 +682,7 @@ v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, } v9fs_blank_wstat(&wstat); - wstat.muid = v9ses->name; + wstat.muid = v9ses->uname; wstat.name = (char *) new_dentry->d_name.name; retval = p9_client_wstat(oldfid, &wstat); @@ -887,7 +887,7 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) retval = -EPERM; v9ses = v9fs_inode2v9ses(dentry->d_inode); fid = v9fs_fid_lookup(dentry); - if(IS_ERR(fid)) + if (IS_ERR(fid)) return PTR_ERR(fid); if (!v9fs_extended(v9ses)) @@ -1070,7 +1070,7 @@ v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, old_dentry->d_name.name); oldfid = v9fs_fid_clone(old_dentry); - if(IS_ERR(oldfid)) + if (IS_ERR(oldfid)) return PTR_ERR(oldfid); name = __getname(); diff --git a/include/net/9p/9p.h b/include/net/9p/9p.h index 7726ff4..7a448a3 100644 --- a/include/net/9p/9p.h +++ b/include/net/9p/9p.h @@ -216,6 +216,7 @@ struct p9_tauth { u32 afid; struct p9_str uname; struct p9_str aname; + u32 n_uname; /* 9P2000.u extensions */ }; struct p9_rauth { @@ -239,6 +240,7 @@ struct p9_tattach { u32 afid; struct p9_str uname; struct p9_str aname; + u32 n_uname; /* 9P2000.u extensions */ }; struct p9_rattach { @@ -382,8 +384,9 @@ int p9_deserialize_fcall(void *buf, u32 buflen, struct p9_fcall *fc, int dotu); void p9_set_tag(struct p9_fcall *fc, u16 tag); struct p9_fcall *p9_create_tversion(u32 msize, char *version); struct p9_fcall *p9_create_tattach(u32 fid, u32 afid, char *uname, - char *aname); -struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname); + char *aname, u32 n_uname, int dotu); +struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname, + u32 n_uname, int dotu); struct p9_fcall *p9_create_tflush(u16 oldtag); struct p9_fcall *p9_create_twalk(u32 fid, u32 newfid, u16 nwname, char **wnames); diff --git a/include/net/9p/client.h b/include/net/9p/client.h index 0adafdb..9b9221a 100644 --- a/include/net/9p/client.h +++ b/include/net/9p/client.h @@ -57,8 +57,9 @@ struct p9_client *p9_client_create(struct p9_trans *trans, int msize, void p9_client_destroy(struct p9_client *clnt); void p9_client_disconnect(struct p9_client *clnt); struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, - char *uname, char *aname); -struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, char *aname); + char *uname, u32 n_uname, char *aname); +struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, + u32 n_uname, char *aname); struct p9_fid *p9_client_walk(struct p9_fid *oldfid, int nwname, char **wnames, int clone); int p9_client_open(struct p9_fid *fid, int mode); diff --git a/net/9p/client.c b/net/9p/client.c index e161012..d83cc12 100644 --- a/net/9p/client.c +++ b/net/9p/client.c @@ -146,7 +146,7 @@ void p9_client_disconnect(struct p9_client *clnt) EXPORT_SYMBOL(p9_client_disconnect); struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, - char *uname, char *aname) + char *uname, u32 n_uname, char *aname) { int err; struct p9_fcall *tc, *rc; @@ -165,7 +165,8 @@ struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, goto error; } - tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname); + tc = p9_create_tattach(fid->fid, afid?afid->fid:P9_NOFID, uname, aname, + n_uname, clnt->dotu); if (IS_ERR(tc)) { err = PTR_ERR(tc); tc = NULL; @@ -190,7 +191,8 @@ error: } EXPORT_SYMBOL(p9_client_attach); -struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, char *aname) +struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, + u32 n_uname, char *aname) { int err; struct p9_fcall *tc, *rc; @@ -209,7 +211,7 @@ struct p9_fid *p9_client_auth(struct p9_client *clnt, char *uname, char *aname) goto error; } - tc = p9_create_tauth(fid->fid, uname, aname); + tc = p9_create_tauth(fid->fid, uname, aname, n_uname, clnt->dotu); if (IS_ERR(tc)) { err = PTR_ERR(tc); tc = NULL; diff --git a/net/9p/conv.c b/net/9p/conv.c index d979d95..aa2aa98 100644 --- a/net/9p/conv.c +++ b/net/9p/conv.c @@ -547,7 +547,8 @@ error: } EXPORT_SYMBOL(p9_create_tversion); -struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname) +struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname, + u32 n_uname, int dotu) { int size; struct p9_fcall *fc; @@ -555,7 +556,16 @@ struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname) struct cbuf *bufp = &buffer; /* afid[4] uname[s] aname[s] */ - size = 4 + 2 + strlen(uname) + 2 + strlen(aname); + size = 4 + 2 + 2; + if (uname) + size += strlen(uname); + + if (aname) + size += strlen(aname); + + if (dotu) + size += 4; /* n_uname */ + fc = p9_create_common(bufp, size, P9_TAUTH); if (IS_ERR(fc)) goto error; @@ -563,6 +573,8 @@ struct p9_fcall *p9_create_tauth(u32 afid, char *uname, char *aname) p9_put_int32(bufp, afid, &fc->params.tauth.afid); p9_put_str(bufp, uname, &fc->params.tauth.uname); p9_put_str(bufp, aname, &fc->params.tauth.aname); + if (dotu) + p9_put_int32(bufp, n_uname, &fc->params.tauth.n_uname); if (buf_check_overflow(bufp)) { kfree(fc); @@ -574,7 +586,8 @@ error: EXPORT_SYMBOL(p9_create_tauth); struct p9_fcall * -p9_create_tattach(u32 fid, u32 afid, char *uname, char *aname) +p9_create_tattach(u32 fid, u32 afid, char *uname, char *aname, + u32 n_uname, int dotu) { int size; struct p9_fcall *fc; @@ -582,7 +595,16 @@ p9_create_tattach(u32 fid, u32 afid, char *uname, char *aname) struct cbuf *bufp = &buffer; /* fid[4] afid[4] uname[s] aname[s] */ - size = 4 + 4 + 2 + strlen(uname) + 2 + strlen(aname); + size = 4 + 4 + 2 + 2; + if (uname) + size += strlen(uname); + + if (aname) + size += strlen(aname); + + if (dotu) + size += 4; /* n_uname */ + fc = p9_create_common(bufp, size, P9_TATTACH); if (IS_ERR(fc)) goto error; @@ -591,6 +613,8 @@ p9_create_tattach(u32 fid, u32 afid, char *uname, char *aname) p9_put_int32(bufp, afid, &fc->params.tattach.afid); p9_put_str(bufp, uname, &fc->params.tattach.uname); p9_put_str(bufp, aname, &fc->params.tattach.aname); + if (dotu) + p9_put_int32(bufp, n_uname, &fc->params.tattach.n_uname); error: return fc; |
