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2314 lines
53 KiB
2314 lines
53 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
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* net/9p/clnt.c |
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* |
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* 9P Client |
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* |
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* Copyright (C) 2008 by Eric Van Hensbergen <[email protected]> |
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* Copyright (C) 2007 by Latchesar Ionkov <[email protected]> |
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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/poll.h> |
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#include <linux/idr.h> |
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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/sched/signal.h> |
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#include <linux/uaccess.h> |
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#include <linux/uio.h> |
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#include <net/9p/9p.h> |
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#include <linux/parser.h> |
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#include <linux/seq_file.h> |
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#include <net/9p/client.h> |
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#include <net/9p/transport.h> |
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#include "protocol.h" |
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|
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#define CREATE_TRACE_POINTS |
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#include <trace/events/9p.h> |
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|
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#define DEFAULT_MSIZE (128 * 1024) |
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|
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/* |
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* Client Option Parsing (code inspired by NFS code) |
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* - a little lazy - parse all client options |
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*/ |
|
|
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enum { |
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Opt_msize, |
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Opt_trans, |
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Opt_legacy, |
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Opt_version, |
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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_msize, "msize=%u"}, |
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{Opt_legacy, "noextend"}, |
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{Opt_trans, "trans=%s"}, |
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{Opt_version, "version=%s"}, |
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{Opt_err, NULL}, |
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}; |
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|
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inline int p9_is_proto_dotl(struct p9_client *clnt) |
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{ |
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return clnt->proto_version == p9_proto_2000L; |
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} |
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EXPORT_SYMBOL(p9_is_proto_dotl); |
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|
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inline int p9_is_proto_dotu(struct p9_client *clnt) |
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{ |
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return clnt->proto_version == p9_proto_2000u; |
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} |
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EXPORT_SYMBOL(p9_is_proto_dotu); |
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|
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int p9_show_client_options(struct seq_file *m, struct p9_client *clnt) |
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{ |
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if (clnt->msize != DEFAULT_MSIZE) |
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seq_printf(m, ",msize=%u", clnt->msize); |
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seq_printf(m, ",trans=%s", clnt->trans_mod->name); |
|
|
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switch (clnt->proto_version) { |
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case p9_proto_legacy: |
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seq_puts(m, ",noextend"); |
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break; |
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case p9_proto_2000u: |
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seq_puts(m, ",version=9p2000.u"); |
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break; |
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case p9_proto_2000L: |
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/* Default */ |
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break; |
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} |
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|
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if (clnt->trans_mod->show_options) |
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return clnt->trans_mod->show_options(m, clnt); |
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return 0; |
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} |
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EXPORT_SYMBOL(p9_show_client_options); |
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|
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/* |
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* Some error codes are taken directly from the server replies, |
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* make sure they are valid. |
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*/ |
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static int safe_errno(int err) |
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{ |
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if ((err > 0) || (err < -MAX_ERRNO)) { |
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p9_debug(P9_DEBUG_ERROR, "Invalid error code %d\n", err); |
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return -EPROTO; |
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} |
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return err; |
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} |
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|
|
|
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/* Interpret mount option for protocol version */ |
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static int get_protocol_version(char *s) |
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{ |
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int version = -EINVAL; |
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|
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if (!strcmp(s, "9p2000")) { |
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version = p9_proto_legacy; |
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p9_debug(P9_DEBUG_9P, "Protocol version: Legacy\n"); |
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} else if (!strcmp(s, "9p2000.u")) { |
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version = p9_proto_2000u; |
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p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.u\n"); |
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} else if (!strcmp(s, "9p2000.L")) { |
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version = p9_proto_2000L; |
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p9_debug(P9_DEBUG_9P, "Protocol version: 9P2000.L\n"); |
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} else |
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pr_info("Unknown protocol version %s\n", s); |
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|
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return version; |
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} |
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|
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/** |
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* parse_opts - parse mount options into client structure |
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* @opts: options string passed from mount |
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* @clnt: existing v9fs client information |
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* |
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* Return 0 upon success, -ERRNO upon failure |
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*/ |
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|
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static int parse_opts(char *opts, struct p9_client *clnt) |
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{ |
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char *options, *tmp_options; |
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char *p; |
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substring_t args[MAX_OPT_ARGS]; |
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int option; |
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char *s; |
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int ret = 0; |
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|
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clnt->proto_version = p9_proto_2000L; |
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clnt->msize = DEFAULT_MSIZE; |
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|
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if (!opts) |
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return 0; |
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|
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tmp_options = kstrdup(opts, GFP_KERNEL); |
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if (!tmp_options) { |
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p9_debug(P9_DEBUG_ERROR, |
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"failed to allocate copy of option string\n"); |
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return -ENOMEM; |
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} |
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options = tmp_options; |
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|
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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_msize: |
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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 < 4096) { |
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p9_debug(P9_DEBUG_ERROR, |
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"msize should be at least 4k\n"); |
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ret = -EINVAL; |
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continue; |
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} |
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clnt->msize = option; |
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break; |
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case Opt_trans: |
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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 trans arg\n"); |
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goto free_and_return; |
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} |
|
|
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v9fs_put_trans(clnt->trans_mod); |
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clnt->trans_mod = v9fs_get_trans_by_name(s); |
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if (clnt->trans_mod == NULL) { |
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pr_info("Could not find request transport: %s\n", |
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s); |
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ret = -EINVAL; |
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} |
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kfree(s); |
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break; |
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case Opt_legacy: |
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clnt->proto_version = p9_proto_legacy; |
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break; |
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case Opt_version: |
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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 version arg\n"); |
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goto free_and_return; |
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} |
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r = get_protocol_version(s); |
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if (r < 0) |
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ret = r; |
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else |
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clnt->proto_version = r; |
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kfree(s); |
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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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if (ret) |
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v9fs_put_trans(clnt->trans_mod); |
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kfree(tmp_options); |
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return ret; |
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} |
|
|
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static int p9_fcall_init(struct p9_client *c, struct p9_fcall *fc, |
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int alloc_msize) |
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{ |
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if (likely(c->fcall_cache) && alloc_msize == c->msize) { |
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fc->sdata = kmem_cache_alloc(c->fcall_cache, GFP_NOFS); |
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fc->cache = c->fcall_cache; |
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} else { |
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fc->sdata = kmalloc(alloc_msize, GFP_NOFS); |
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fc->cache = NULL; |
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} |
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if (!fc->sdata) |
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return -ENOMEM; |
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fc->capacity = alloc_msize; |
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return 0; |
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} |
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|
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void p9_fcall_fini(struct p9_fcall *fc) |
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{ |
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/* sdata can be NULL for interrupted requests in trans_rdma, |
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* and kmem_cache_free does not do NULL-check for us |
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*/ |
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if (unlikely(!fc->sdata)) |
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return; |
|
|
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if (fc->cache) |
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kmem_cache_free(fc->cache, fc->sdata); |
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else |
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kfree(fc->sdata); |
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} |
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EXPORT_SYMBOL(p9_fcall_fini); |
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|
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static struct kmem_cache *p9_req_cache; |
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|
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/** |
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* p9_tag_alloc - Allocate a new request. |
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* @c: Client session. |
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* @type: Transaction type. |
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* @max_size: Maximum packet size for this request. |
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* |
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* Context: Process context. |
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* Return: Pointer to new request. |
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*/ |
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static struct p9_req_t * |
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p9_tag_alloc(struct p9_client *c, int8_t type, unsigned int max_size) |
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{ |
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struct p9_req_t *req = kmem_cache_alloc(p9_req_cache, GFP_NOFS); |
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int alloc_msize = min(c->msize, max_size); |
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int tag; |
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|
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if (!req) |
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return ERR_PTR(-ENOMEM); |
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|
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if (p9_fcall_init(c, &req->tc, alloc_msize)) |
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goto free_req; |
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if (p9_fcall_init(c, &req->rc, alloc_msize)) |
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goto free; |
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|
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p9pdu_reset(&req->tc); |
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p9pdu_reset(&req->rc); |
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req->t_err = 0; |
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req->status = REQ_STATUS_ALLOC; |
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init_waitqueue_head(&req->wq); |
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INIT_LIST_HEAD(&req->req_list); |
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|
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idr_preload(GFP_NOFS); |
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spin_lock_irq(&c->lock); |
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if (type == P9_TVERSION) |
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tag = idr_alloc(&c->reqs, req, P9_NOTAG, P9_NOTAG + 1, |
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GFP_NOWAIT); |
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else |
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tag = idr_alloc(&c->reqs, req, 0, P9_NOTAG, GFP_NOWAIT); |
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req->tc.tag = tag; |
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spin_unlock_irq(&c->lock); |
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idr_preload_end(); |
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if (tag < 0) |
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goto free; |
|
|
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/* Init ref to two because in the general case there is one ref |
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* that is put asynchronously by a writer thread, one ref |
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* temporarily given by p9_tag_lookup and put by p9_client_cb |
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* in the recv thread, and one ref put by p9_tag_remove in the |
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* main thread. The only exception is virtio that does not use |
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* p9_tag_lookup but does not have a writer thread either |
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* (the write happens synchronously in the request/zc_request |
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* callback), so p9_client_cb eats the second ref there |
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* as the pointer is duplicated directly by virtqueue_add_sgs() |
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*/ |
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refcount_set(&req->refcount.refcount, 2); |
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|
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return req; |
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|
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free: |
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p9_fcall_fini(&req->tc); |
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p9_fcall_fini(&req->rc); |
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free_req: |
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kmem_cache_free(p9_req_cache, req); |
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return ERR_PTR(-ENOMEM); |
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} |
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|
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/** |
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* p9_tag_lookup - Look up a request by tag. |
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* @c: Client session. |
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* @tag: Transaction ID. |
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* |
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* Context: Any context. |
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* Return: A request, or %NULL if there is no request with that tag. |
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*/ |
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struct p9_req_t *p9_tag_lookup(struct p9_client *c, u16 tag) |
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{ |
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struct p9_req_t *req; |
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|
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rcu_read_lock(); |
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again: |
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req = idr_find(&c->reqs, tag); |
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if (req) { |
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/* We have to be careful with the req found under rcu_read_lock |
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* Thanks to SLAB_TYPESAFE_BY_RCU we can safely try to get the |
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* ref again without corrupting other data, then check again |
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* that the tag matches once we have the ref |
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*/ |
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if (!p9_req_try_get(req)) |
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goto again; |
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if (req->tc.tag != tag) { |
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p9_req_put(req); |
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goto again; |
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} |
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} |
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rcu_read_unlock(); |
|
|
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return req; |
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} |
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EXPORT_SYMBOL(p9_tag_lookup); |
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|
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/** |
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* p9_tag_remove - Remove a tag. |
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* @c: Client session. |
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* @r: Request of reference. |
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* |
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* Context: Any context. |
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*/ |
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static int p9_tag_remove(struct p9_client *c, struct p9_req_t *r) |
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{ |
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unsigned long flags; |
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u16 tag = r->tc.tag; |
|
|
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p9_debug(P9_DEBUG_MUX, "clnt %p req %p tag: %d\n", c, r, tag); |
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spin_lock_irqsave(&c->lock, flags); |
|
idr_remove(&c->reqs, tag); |
|
spin_unlock_irqrestore(&c->lock, flags); |
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return p9_req_put(r); |
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} |
|
|
|
static void p9_req_free(struct kref *ref) |
|
{ |
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struct p9_req_t *r = container_of(ref, struct p9_req_t, refcount); |
|
p9_fcall_fini(&r->tc); |
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p9_fcall_fini(&r->rc); |
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kmem_cache_free(p9_req_cache, r); |
|
} |
|
|
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int p9_req_put(struct p9_req_t *r) |
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{ |
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return kref_put(&r->refcount, p9_req_free); |
|
} |
|
EXPORT_SYMBOL(p9_req_put); |
|
|
|
/** |
|
* p9_tag_cleanup - cleans up tags structure and reclaims resources |
|
* @c: v9fs client struct |
|
* |
|
* This frees resources associated with the tags structure |
|
* |
|
*/ |
|
static void p9_tag_cleanup(struct p9_client *c) |
|
{ |
|
struct p9_req_t *req; |
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int id; |
|
|
|
rcu_read_lock(); |
|
idr_for_each_entry(&c->reqs, req, id) { |
|
pr_info("Tag %d still in use\n", id); |
|
if (p9_tag_remove(c, req) == 0) |
|
pr_warn("Packet with tag %d has still references", |
|
req->tc.tag); |
|
} |
|
rcu_read_unlock(); |
|
} |
|
|
|
/** |
|
* p9_client_cb - call back from transport to client |
|
* @c: client state |
|
* @req: request received |
|
* @status: request status, one of REQ_STATUS_* |
|
* |
|
*/ |
|
void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status) |
|
{ |
|
p9_debug(P9_DEBUG_MUX, " tag %d\n", req->tc.tag); |
|
|
|
/* |
|
* This barrier is needed to make sure any change made to req before |
|
* the status change is visible to another thread |
|
*/ |
|
smp_wmb(); |
|
req->status = status; |
|
|
|
wake_up(&req->wq); |
|
p9_debug(P9_DEBUG_MUX, "wakeup: %d\n", req->tc.tag); |
|
p9_req_put(req); |
|
} |
|
EXPORT_SYMBOL(p9_client_cb); |
|
|
|
/** |
|
* p9_parse_header - parse header arguments out of a packet |
|
* @pdu: packet to parse |
|
* @size: size of packet |
|
* @type: type of request |
|
* @tag: tag of packet |
|
* @rewind: set if we need to rewind offset afterwards |
|
*/ |
|
|
|
int |
|
p9_parse_header(struct p9_fcall *pdu, int32_t *size, int8_t *type, int16_t *tag, |
|
int rewind) |
|
{ |
|
int8_t r_type; |
|
int16_t r_tag; |
|
int32_t r_size; |
|
int offset = pdu->offset; |
|
int err; |
|
|
|
pdu->offset = 0; |
|
|
|
err = p9pdu_readf(pdu, 0, "dbw", &r_size, &r_type, &r_tag); |
|
if (err) |
|
goto rewind_and_exit; |
|
|
|
if (type) |
|
*type = r_type; |
|
if (tag) |
|
*tag = r_tag; |
|
if (size) |
|
*size = r_size; |
|
|
|
if (pdu->size != r_size || r_size < 7) { |
|
err = -EINVAL; |
|
goto rewind_and_exit; |
|
} |
|
|
|
pdu->id = r_type; |
|
pdu->tag = r_tag; |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< size=%d type: %d tag: %d\n", |
|
pdu->size, pdu->id, pdu->tag); |
|
|
|
rewind_and_exit: |
|
if (rewind) |
|
pdu->offset = offset; |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_parse_header); |
|
|
|
/** |
|
* p9_check_errors - check 9p packet for error return and process it |
|
* @c: current client instance |
|
* @req: request to parse and check for error conditions |
|
* |
|
* returns error code if one is discovered, otherwise returns 0 |
|
* |
|
* this will have to be more complicated if we have multiple |
|
* error packet types |
|
*/ |
|
|
|
static int p9_check_errors(struct p9_client *c, struct p9_req_t *req) |
|
{ |
|
int8_t type; |
|
int err; |
|
int ecode; |
|
|
|
err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
|
if (req->rc.size >= c->msize) { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"requested packet size too big: %d\n", |
|
req->rc.size); |
|
return -EIO; |
|
} |
|
/* |
|
* dump the response from server |
|
* This should be after check errors which poplulate pdu_fcall. |
|
*/ |
|
trace_9p_protocol_dump(c, &req->rc); |
|
if (err) { |
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
|
return err; |
|
} |
|
if (type != P9_RERROR && type != P9_RLERROR) |
|
return 0; |
|
|
|
if (!p9_is_proto_dotl(c)) { |
|
char *ename; |
|
err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
|
&ename, &ecode); |
|
if (err) |
|
goto out_err; |
|
|
|
if (p9_is_proto_dotu(c) && ecode < 512) |
|
err = -ecode; |
|
|
|
if (!err) { |
|
err = p9_errstr2errno(ename, strlen(ename)); |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
|
-ecode, ename); |
|
} |
|
kfree(ename); |
|
} else { |
|
err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
|
err = -ecode; |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
|
} |
|
|
|
return err; |
|
|
|
out_err: |
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
|
|
|
return err; |
|
} |
|
|
|
/** |
|
* p9_check_zc_errors - check 9p packet for error return and process it |
|
* @c: current client instance |
|
* @req: request to parse and check for error conditions |
|
* @uidata: external buffer containing error |
|
* @in_hdrlen: Size of response protocol buffer. |
|
* |
|
* returns error code if one is discovered, otherwise returns 0 |
|
* |
|
* this will have to be more complicated if we have multiple |
|
* error packet types |
|
*/ |
|
|
|
static int p9_check_zc_errors(struct p9_client *c, struct p9_req_t *req, |
|
struct iov_iter *uidata, int in_hdrlen) |
|
{ |
|
int err; |
|
int ecode; |
|
int8_t type; |
|
char *ename = NULL; |
|
|
|
err = p9_parse_header(&req->rc, NULL, &type, NULL, 0); |
|
/* |
|
* dump the response from server |
|
* This should be after parse_header which poplulate pdu_fcall. |
|
*/ |
|
trace_9p_protocol_dump(c, &req->rc); |
|
if (err) { |
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse header %d\n", err); |
|
return err; |
|
} |
|
|
|
if (type != P9_RERROR && type != P9_RLERROR) |
|
return 0; |
|
|
|
if (!p9_is_proto_dotl(c)) { |
|
/* Error is reported in string format */ |
|
int len; |
|
/* 7 = header size for RERROR; */ |
|
int inline_len = in_hdrlen - 7; |
|
|
|
len = req->rc.size - req->rc.offset; |
|
if (len > (P9_ZC_HDR_SZ - 7)) { |
|
err = -EFAULT; |
|
goto out_err; |
|
} |
|
|
|
ename = &req->rc.sdata[req->rc.offset]; |
|
if (len > inline_len) { |
|
/* We have error in external buffer */ |
|
if (!copy_from_iter_full(ename + inline_len, |
|
len - inline_len, uidata)) { |
|
err = -EFAULT; |
|
goto out_err; |
|
} |
|
} |
|
ename = NULL; |
|
err = p9pdu_readf(&req->rc, c->proto_version, "s?d", |
|
&ename, &ecode); |
|
if (err) |
|
goto out_err; |
|
|
|
if (p9_is_proto_dotu(c) && ecode < 512) |
|
err = -ecode; |
|
|
|
if (!err) { |
|
err = p9_errstr2errno(ename, strlen(ename)); |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RERROR (%d) %s\n", |
|
-ecode, ename); |
|
} |
|
kfree(ename); |
|
} else { |
|
err = p9pdu_readf(&req->rc, c->proto_version, "d", &ecode); |
|
err = -ecode; |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLERROR (%d)\n", -ecode); |
|
} |
|
return err; |
|
|
|
out_err: |
|
p9_debug(P9_DEBUG_ERROR, "couldn't parse error%d\n", err); |
|
return err; |
|
} |
|
|
|
static struct p9_req_t * |
|
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...); |
|
|
|
/** |
|
* p9_client_flush - flush (cancel) a request |
|
* @c: client state |
|
* @oldreq: request to cancel |
|
* |
|
* This sents a flush for a particular request and links |
|
* the flush request to the original request. The current |
|
* code only supports a single flush request although the protocol |
|
* allows for multiple flush requests to be sent for a single request. |
|
* |
|
*/ |
|
|
|
static int p9_client_flush(struct p9_client *c, struct p9_req_t *oldreq) |
|
{ |
|
struct p9_req_t *req; |
|
int16_t oldtag; |
|
int err; |
|
|
|
err = p9_parse_header(&oldreq->tc, NULL, NULL, &oldtag, 1); |
|
if (err) |
|
return err; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TFLUSH tag %d\n", oldtag); |
|
|
|
req = p9_client_rpc(c, P9_TFLUSH, "w", oldtag); |
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
/* |
|
* if we haven't received a response for oldreq, |
|
* remove it from the list |
|
*/ |
|
if (oldreq->status == REQ_STATUS_SENT) { |
|
if (c->trans_mod->cancelled) |
|
c->trans_mod->cancelled(c, oldreq); |
|
} |
|
|
|
p9_tag_remove(c, req); |
|
return 0; |
|
} |
|
|
|
static struct p9_req_t *p9_client_prepare_req(struct p9_client *c, |
|
int8_t type, int req_size, |
|
const char *fmt, va_list ap) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
|
|
p9_debug(P9_DEBUG_MUX, "client %p op %d\n", c, type); |
|
|
|
/* we allow for any status other than disconnected */ |
|
if (c->status == Disconnected) |
|
return ERR_PTR(-EIO); |
|
|
|
/* if status is begin_disconnected we allow only clunk request */ |
|
if ((c->status == BeginDisconnect) && (type != P9_TCLUNK)) |
|
return ERR_PTR(-EIO); |
|
|
|
req = p9_tag_alloc(c, type, req_size); |
|
if (IS_ERR(req)) |
|
return req; |
|
|
|
/* marshall the data */ |
|
p9pdu_prepare(&req->tc, req->tc.tag, type); |
|
err = p9pdu_vwritef(&req->tc, c->proto_version, fmt, ap); |
|
if (err) |
|
goto reterr; |
|
p9pdu_finalize(c, &req->tc); |
|
trace_9p_client_req(c, type, req->tc.tag); |
|
return req; |
|
reterr: |
|
p9_tag_remove(c, req); |
|
/* We have to put also the 2nd reference as it won't be used */ |
|
p9_req_put(req); |
|
return ERR_PTR(err); |
|
} |
|
|
|
/** |
|
* p9_client_rpc - issue a request and wait for a response |
|
* @c: client session |
|
* @type: type of request |
|
* @fmt: protocol format string (see protocol.c) |
|
* |
|
* Returns request structure (which client must free using p9_tag_remove) |
|
*/ |
|
|
|
static struct p9_req_t * |
|
p9_client_rpc(struct p9_client *c, int8_t type, const char *fmt, ...) |
|
{ |
|
va_list ap; |
|
int sigpending, err; |
|
unsigned long flags; |
|
struct p9_req_t *req; |
|
|
|
va_start(ap, fmt); |
|
req = p9_client_prepare_req(c, type, c->msize, fmt, ap); |
|
va_end(ap); |
|
if (IS_ERR(req)) |
|
return req; |
|
|
|
if (signal_pending(current)) { |
|
sigpending = 1; |
|
clear_thread_flag(TIF_SIGPENDING); |
|
} else |
|
sigpending = 0; |
|
|
|
err = c->trans_mod->request(c, req); |
|
if (err < 0) { |
|
/* write won't happen */ |
|
p9_req_put(req); |
|
if (err != -ERESTARTSYS && err != -EFAULT) |
|
c->status = Disconnected; |
|
goto recalc_sigpending; |
|
} |
|
again: |
|
/* Wait for the response */ |
|
err = wait_event_killable(req->wq, req->status >= REQ_STATUS_RCVD); |
|
|
|
/* |
|
* Make sure our req is coherent with regard to updates in other |
|
* threads - echoes to wmb() in the callback |
|
*/ |
|
smp_rmb(); |
|
|
|
if ((err == -ERESTARTSYS) && (c->status == Connected) |
|
&& (type == P9_TFLUSH)) { |
|
sigpending = 1; |
|
clear_thread_flag(TIF_SIGPENDING); |
|
goto again; |
|
} |
|
|
|
if (req->status == REQ_STATUS_ERROR) { |
|
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
|
err = req->t_err; |
|
} |
|
if ((err == -ERESTARTSYS) && (c->status == Connected)) { |
|
p9_debug(P9_DEBUG_MUX, "flushing\n"); |
|
sigpending = 1; |
|
clear_thread_flag(TIF_SIGPENDING); |
|
|
|
if (c->trans_mod->cancel(c, req)) |
|
p9_client_flush(c, req); |
|
|
|
/* if we received the response anyway, don't signal error */ |
|
if (req->status == REQ_STATUS_RCVD) |
|
err = 0; |
|
} |
|
recalc_sigpending: |
|
if (sigpending) { |
|
spin_lock_irqsave(¤t->sighand->siglock, flags); |
|
recalc_sigpending(); |
|
spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
|
} |
|
if (err < 0) |
|
goto reterr; |
|
|
|
err = p9_check_errors(c, req); |
|
trace_9p_client_res(c, type, req->rc.tag, err); |
|
if (!err) |
|
return req; |
|
reterr: |
|
p9_tag_remove(c, req); |
|
return ERR_PTR(safe_errno(err)); |
|
} |
|
|
|
/** |
|
* p9_client_zc_rpc - issue a request and wait for a response |
|
* @c: client session |
|
* @type: type of request |
|
* @uidata: destination for zero copy read |
|
* @uodata: source for zero copy write |
|
* @inlen: read buffer size |
|
* @olen: write buffer size |
|
* @in_hdrlen: reader header size, This is the size of response protocol data |
|
* @fmt: protocol format string (see protocol.c) |
|
* |
|
* Returns request structure (which client must free using p9_tag_remove) |
|
*/ |
|
static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type, |
|
struct iov_iter *uidata, |
|
struct iov_iter *uodata, |
|
int inlen, int olen, int in_hdrlen, |
|
const char *fmt, ...) |
|
{ |
|
va_list ap; |
|
int sigpending, err; |
|
unsigned long flags; |
|
struct p9_req_t *req; |
|
|
|
va_start(ap, fmt); |
|
/* |
|
* We allocate a inline protocol data of only 4k bytes. |
|
* The actual content is passed in zero-copy fashion. |
|
*/ |
|
req = p9_client_prepare_req(c, type, P9_ZC_HDR_SZ, fmt, ap); |
|
va_end(ap); |
|
if (IS_ERR(req)) |
|
return req; |
|
|
|
if (signal_pending(current)) { |
|
sigpending = 1; |
|
clear_thread_flag(TIF_SIGPENDING); |
|
} else |
|
sigpending = 0; |
|
|
|
err = c->trans_mod->zc_request(c, req, uidata, uodata, |
|
inlen, olen, in_hdrlen); |
|
if (err < 0) { |
|
if (err == -EIO) |
|
c->status = Disconnected; |
|
if (err != -ERESTARTSYS) |
|
goto recalc_sigpending; |
|
} |
|
if (req->status == REQ_STATUS_ERROR) { |
|
p9_debug(P9_DEBUG_ERROR, "req_status error %d\n", req->t_err); |
|
err = req->t_err; |
|
} |
|
if ((err == -ERESTARTSYS) && (c->status == Connected)) { |
|
p9_debug(P9_DEBUG_MUX, "flushing\n"); |
|
sigpending = 1; |
|
clear_thread_flag(TIF_SIGPENDING); |
|
|
|
if (c->trans_mod->cancel(c, req)) |
|
p9_client_flush(c, req); |
|
|
|
/* if we received the response anyway, don't signal error */ |
|
if (req->status == REQ_STATUS_RCVD) |
|
err = 0; |
|
} |
|
recalc_sigpending: |
|
if (sigpending) { |
|
spin_lock_irqsave(¤t->sighand->siglock, flags); |
|
recalc_sigpending(); |
|
spin_unlock_irqrestore(¤t->sighand->siglock, flags); |
|
} |
|
if (err < 0) |
|
goto reterr; |
|
|
|
err = p9_check_zc_errors(c, req, uidata, in_hdrlen); |
|
trace_9p_client_res(c, type, req->rc.tag, err); |
|
if (!err) |
|
return req; |
|
reterr: |
|
p9_tag_remove(c, req); |
|
return ERR_PTR(safe_errno(err)); |
|
} |
|
|
|
static struct p9_fid *p9_fid_create(struct p9_client *clnt) |
|
{ |
|
int ret; |
|
struct p9_fid *fid; |
|
|
|
p9_debug(P9_DEBUG_FID, "clnt %p\n", clnt); |
|
fid = kmalloc(sizeof(struct p9_fid), GFP_KERNEL); |
|
if (!fid) |
|
return NULL; |
|
|
|
memset(&fid->qid, 0, sizeof(struct p9_qid)); |
|
fid->mode = -1; |
|
fid->uid = current_fsuid(); |
|
fid->clnt = clnt; |
|
fid->rdir = NULL; |
|
fid->fid = 0; |
|
refcount_set(&fid->count, 1); |
|
|
|
idr_preload(GFP_KERNEL); |
|
spin_lock_irq(&clnt->lock); |
|
ret = idr_alloc_u32(&clnt->fids, fid, &fid->fid, P9_NOFID - 1, |
|
GFP_NOWAIT); |
|
spin_unlock_irq(&clnt->lock); |
|
idr_preload_end(); |
|
if (!ret) |
|
return fid; |
|
|
|
kfree(fid); |
|
return NULL; |
|
} |
|
|
|
static void p9_fid_destroy(struct p9_fid *fid) |
|
{ |
|
struct p9_client *clnt; |
|
unsigned long flags; |
|
|
|
p9_debug(P9_DEBUG_FID, "fid %d\n", fid->fid); |
|
clnt = fid->clnt; |
|
spin_lock_irqsave(&clnt->lock, flags); |
|
idr_remove(&clnt->fids, fid->fid); |
|
spin_unlock_irqrestore(&clnt->lock, flags); |
|
kfree(fid->rdir); |
|
kfree(fid); |
|
} |
|
|
|
static int p9_client_version(struct p9_client *c) |
|
{ |
|
int err = 0; |
|
struct p9_req_t *req; |
|
char *version = NULL; |
|
int msize; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TVERSION msize %d protocol %d\n", |
|
c->msize, c->proto_version); |
|
|
|
switch (c->proto_version) { |
|
case p9_proto_2000L: |
|
req = p9_client_rpc(c, P9_TVERSION, "ds", |
|
c->msize, "9P2000.L"); |
|
break; |
|
case p9_proto_2000u: |
|
req = p9_client_rpc(c, P9_TVERSION, "ds", |
|
c->msize, "9P2000.u"); |
|
break; |
|
case p9_proto_legacy: |
|
req = p9_client_rpc(c, P9_TVERSION, "ds", |
|
c->msize, "9P2000"); |
|
break; |
|
default: |
|
return -EINVAL; |
|
} |
|
|
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
err = p9pdu_readf(&req->rc, c->proto_version, "ds", &msize, &version); |
|
if (err) { |
|
p9_debug(P9_DEBUG_9P, "version error %d\n", err); |
|
trace_9p_protocol_dump(c, &req->rc); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RVERSION msize %d %s\n", msize, version); |
|
if (!strncmp(version, "9P2000.L", 8)) |
|
c->proto_version = p9_proto_2000L; |
|
else if (!strncmp(version, "9P2000.u", 8)) |
|
c->proto_version = p9_proto_2000u; |
|
else if (!strncmp(version, "9P2000", 6)) |
|
c->proto_version = p9_proto_legacy; |
|
else { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"server returned an unknown version: %s\n", version); |
|
err = -EREMOTEIO; |
|
goto error; |
|
} |
|
|
|
if (msize < 4096) { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"server returned a msize < 4096: %d\n", msize); |
|
err = -EREMOTEIO; |
|
goto error; |
|
} |
|
if (msize < c->msize) |
|
c->msize = msize; |
|
|
|
error: |
|
kfree(version); |
|
p9_tag_remove(c, req); |
|
|
|
return err; |
|
} |
|
|
|
struct p9_client *p9_client_create(const char *dev_name, char *options) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
char *client_id; |
|
|
|
err = 0; |
|
clnt = kmalloc(sizeof(struct p9_client), GFP_KERNEL); |
|
if (!clnt) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
clnt->trans_mod = NULL; |
|
clnt->trans = NULL; |
|
clnt->fcall_cache = NULL; |
|
|
|
client_id = utsname()->nodename; |
|
memcpy(clnt->name, client_id, strlen(client_id) + 1); |
|
|
|
spin_lock_init(&clnt->lock); |
|
idr_init(&clnt->fids); |
|
idr_init(&clnt->reqs); |
|
|
|
err = parse_opts(options, clnt); |
|
if (err < 0) |
|
goto free_client; |
|
|
|
if (!clnt->trans_mod) |
|
clnt->trans_mod = v9fs_get_default_trans(); |
|
|
|
if (clnt->trans_mod == NULL) { |
|
err = -EPROTONOSUPPORT; |
|
p9_debug(P9_DEBUG_ERROR, |
|
"No transport defined or default transport\n"); |
|
goto free_client; |
|
} |
|
|
|
p9_debug(P9_DEBUG_MUX, "clnt %p trans %p msize %d protocol %d\n", |
|
clnt, clnt->trans_mod, clnt->msize, clnt->proto_version); |
|
|
|
err = clnt->trans_mod->create(clnt, dev_name, options); |
|
if (err) |
|
goto put_trans; |
|
|
|
if (clnt->msize > clnt->trans_mod->maxsize) |
|
clnt->msize = clnt->trans_mod->maxsize; |
|
|
|
if (clnt->msize < 4096) { |
|
p9_debug(P9_DEBUG_ERROR, |
|
"Please specify a msize of at least 4k\n"); |
|
err = -EINVAL; |
|
goto close_trans; |
|
} |
|
|
|
err = p9_client_version(clnt); |
|
if (err) |
|
goto close_trans; |
|
|
|
/* P9_HDRSZ + 4 is the smallest packet header we can have that is |
|
* followed by data accessed from userspace by read |
|
*/ |
|
clnt->fcall_cache = |
|
kmem_cache_create_usercopy("9p-fcall-cache", clnt->msize, |
|
0, 0, P9_HDRSZ + 4, |
|
clnt->msize - (P9_HDRSZ + 4), |
|
NULL); |
|
|
|
return clnt; |
|
|
|
close_trans: |
|
clnt->trans_mod->close(clnt); |
|
put_trans: |
|
v9fs_put_trans(clnt->trans_mod); |
|
free_client: |
|
kfree(clnt); |
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL(p9_client_create); |
|
|
|
void p9_client_destroy(struct p9_client *clnt) |
|
{ |
|
struct p9_fid *fid; |
|
int id; |
|
|
|
p9_debug(P9_DEBUG_MUX, "clnt %p\n", clnt); |
|
|
|
if (clnt->trans_mod) |
|
clnt->trans_mod->close(clnt); |
|
|
|
v9fs_put_trans(clnt->trans_mod); |
|
|
|
idr_for_each_entry(&clnt->fids, fid, id) { |
|
pr_info("Found fid %d not clunked\n", fid->fid); |
|
p9_fid_destroy(fid); |
|
} |
|
|
|
p9_tag_cleanup(clnt); |
|
|
|
kmem_cache_destroy(clnt->fcall_cache); |
|
kfree(clnt); |
|
} |
|
EXPORT_SYMBOL(p9_client_destroy); |
|
|
|
void p9_client_disconnect(struct p9_client *clnt) |
|
{ |
|
p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
|
clnt->status = Disconnected; |
|
} |
|
EXPORT_SYMBOL(p9_client_disconnect); |
|
|
|
void p9_client_begin_disconnect(struct p9_client *clnt) |
|
{ |
|
p9_debug(P9_DEBUG_9P, "clnt %p\n", clnt); |
|
clnt->status = BeginDisconnect; |
|
} |
|
EXPORT_SYMBOL(p9_client_begin_disconnect); |
|
|
|
struct p9_fid *p9_client_attach(struct p9_client *clnt, struct p9_fid *afid, |
|
const char *uname, kuid_t n_uname, const char *aname) |
|
{ |
|
int err = 0; |
|
struct p9_req_t *req; |
|
struct p9_fid *fid; |
|
struct p9_qid qid; |
|
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TATTACH afid %d uname %s aname %s\n", |
|
afid ? afid->fid : -1, uname, aname); |
|
fid = p9_fid_create(clnt); |
|
if (!fid) { |
|
err = -ENOMEM; |
|
goto error; |
|
} |
|
fid->uid = n_uname; |
|
|
|
req = p9_client_rpc(clnt, P9_TATTACH, "ddss?u", fid->fid, |
|
afid ? afid->fid : P9_NOFID, uname, aname, n_uname); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", &qid); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RATTACH qid %x.%llx.%x\n", |
|
qid.type, (unsigned long long)qid.path, qid.version); |
|
|
|
memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
|
|
|
p9_tag_remove(clnt, req); |
|
return fid; |
|
|
|
error: |
|
if (fid) |
|
p9_fid_destroy(fid); |
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL(p9_client_attach); |
|
|
|
struct p9_fid *p9_client_walk(struct p9_fid *oldfid, uint16_t nwname, |
|
const unsigned char * const *wnames, int clone) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_fid *fid; |
|
struct p9_qid *wqids; |
|
struct p9_req_t *req; |
|
uint16_t nwqids, count; |
|
|
|
err = 0; |
|
wqids = NULL; |
|
clnt = oldfid->clnt; |
|
if (clone) { |
|
fid = p9_fid_create(clnt); |
|
if (!fid) { |
|
err = -ENOMEM; |
|
goto error; |
|
} |
|
|
|
fid->uid = oldfid->uid; |
|
} else |
|
fid = oldfid; |
|
|
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TWALK fids %d,%d nwname %ud wname[0] %s\n", |
|
oldfid->fid, fid->fid, nwname, wnames ? wnames[0] : NULL); |
|
req = p9_client_rpc(clnt, P9_TWALK, "ddT", oldfid->fid, fid->fid, |
|
nwname, wnames); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "R", &nwqids, &wqids); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
goto clunk_fid; |
|
} |
|
p9_tag_remove(clnt, req); |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RWALK nwqid %d:\n", nwqids); |
|
|
|
if (nwqids != nwname) { |
|
err = -ENOENT; |
|
goto clunk_fid; |
|
} |
|
|
|
for (count = 0; count < nwqids; count++) |
|
p9_debug(P9_DEBUG_9P, "<<< [%d] %x.%llx.%x\n", |
|
count, wqids[count].type, |
|
(unsigned long long)wqids[count].path, |
|
wqids[count].version); |
|
|
|
if (nwname) |
|
memmove(&fid->qid, &wqids[nwqids - 1], sizeof(struct p9_qid)); |
|
else |
|
memmove(&fid->qid, &oldfid->qid, sizeof(struct p9_qid)); |
|
|
|
kfree(wqids); |
|
return fid; |
|
|
|
clunk_fid: |
|
kfree(wqids); |
|
p9_client_clunk(fid); |
|
fid = NULL; |
|
|
|
error: |
|
if (fid && (fid != oldfid)) |
|
p9_fid_destroy(fid); |
|
|
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL(p9_client_walk); |
|
|
|
int p9_client_open(struct p9_fid *fid, int mode) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
struct p9_qid qid; |
|
int iounit; |
|
|
|
clnt = fid->clnt; |
|
p9_debug(P9_DEBUG_9P, ">>> %s fid %d mode %d\n", |
|
p9_is_proto_dotl(clnt) ? "TLOPEN" : "TOPEN", fid->fid, mode); |
|
err = 0; |
|
|
|
if (fid->mode != -1) |
|
return -EINVAL; |
|
|
|
if (p9_is_proto_dotl(clnt)) |
|
req = p9_client_rpc(clnt, P9_TLOPEN, "dd", fid->fid, mode); |
|
else |
|
req = p9_client_rpc(clnt, P9_TOPEN, "db", fid->fid, mode); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto free_and_error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< %s qid %x.%llx.%x iounit %x\n", |
|
p9_is_proto_dotl(clnt) ? "RLOPEN" : "ROPEN", qid.type, |
|
(unsigned long long)qid.path, qid.version, iounit); |
|
|
|
memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
|
fid->mode = mode; |
|
fid->iounit = iounit; |
|
|
|
free_and_error: |
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_open); |
|
|
|
int p9_client_create_dotl(struct p9_fid *ofid, const char *name, u32 flags, u32 mode, |
|
kgid_t gid, struct p9_qid *qid) |
|
{ |
|
int err = 0; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
int iounit; |
|
|
|
p9_debug(P9_DEBUG_9P, |
|
">>> TLCREATE fid %d name %s flags %d mode %d gid %d\n", |
|
ofid->fid, name, flags, mode, |
|
from_kgid(&init_user_ns, gid)); |
|
clnt = ofid->clnt; |
|
|
|
if (ofid->mode != -1) |
|
return -EINVAL; |
|
|
|
req = p9_client_rpc(clnt, P9_TLCREATE, "dsddg", ofid->fid, name, flags, |
|
mode, gid); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", qid, &iounit); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto free_and_error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLCREATE qid %x.%llx.%x iounit %x\n", |
|
qid->type, |
|
(unsigned long long)qid->path, |
|
qid->version, iounit); |
|
|
|
memmove(&ofid->qid, qid, sizeof(struct p9_qid)); |
|
ofid->mode = mode; |
|
ofid->iounit = iounit; |
|
|
|
free_and_error: |
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_create_dotl); |
|
|
|
int p9_client_fcreate(struct p9_fid *fid, const char *name, u32 perm, int mode, |
|
char *extension) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
struct p9_qid qid; |
|
int iounit; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TCREATE fid %d name %s perm %d mode %d\n", |
|
fid->fid, name, perm, mode); |
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
if (fid->mode != -1) |
|
return -EINVAL; |
|
|
|
req = p9_client_rpc(clnt, P9_TCREATE, "dsdb?s", fid->fid, name, perm, |
|
mode, extension); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "Qd", &qid, &iounit); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto free_and_error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RCREATE qid %x.%llx.%x iounit %x\n", |
|
qid.type, |
|
(unsigned long long)qid.path, |
|
qid.version, iounit); |
|
|
|
memmove(&fid->qid, &qid, sizeof(struct p9_qid)); |
|
fid->mode = mode; |
|
fid->iounit = iounit; |
|
|
|
free_and_error: |
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_fcreate); |
|
|
|
int p9_client_symlink(struct p9_fid *dfid, const char *name, |
|
const char *symtgt, kgid_t gid, struct p9_qid *qid) |
|
{ |
|
int err = 0; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TSYMLINK dfid %d name %s symtgt %s\n", |
|
dfid->fid, name, symtgt); |
|
clnt = dfid->clnt; |
|
|
|
req = p9_client_rpc(clnt, P9_TSYMLINK, "dssg", dfid->fid, name, symtgt, |
|
gid); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto free_and_error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RSYMLINK qid %x.%llx.%x\n", |
|
qid->type, (unsigned long long)qid->path, qid->version); |
|
|
|
free_and_error: |
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_symlink); |
|
|
|
int p9_client_link(struct p9_fid *dfid, struct p9_fid *oldfid, const char *newname) |
|
{ |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TLINK dfid %d oldfid %d newname %s\n", |
|
dfid->fid, oldfid->fid, newname); |
|
clnt = dfid->clnt; |
|
req = p9_client_rpc(clnt, P9_TLINK, "dds", dfid->fid, oldfid->fid, |
|
newname); |
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RLINK\n"); |
|
p9_tag_remove(clnt, req); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(p9_client_link); |
|
|
|
int p9_client_fsync(struct p9_fid *fid, int datasync) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TFSYNC fid %d datasync:%d\n", |
|
fid->fid, datasync); |
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
req = p9_client_rpc(clnt, P9_TFSYNC, "dd", fid->fid, datasync); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RFSYNC fid %d\n", fid->fid); |
|
|
|
p9_tag_remove(clnt, req); |
|
|
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_fsync); |
|
|
|
int p9_client_clunk(struct p9_fid *fid) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
int retries = 0; |
|
|
|
if (!fid || IS_ERR(fid)) { |
|
pr_warn("%s (%d): Trying to clunk with invalid fid\n", |
|
__func__, task_pid_nr(current)); |
|
dump_stack(); |
|
return 0; |
|
} |
|
if (!refcount_dec_and_test(&fid->count)) |
|
return 0; |
|
|
|
again: |
|
p9_debug(P9_DEBUG_9P, ">>> TCLUNK fid %d (try %d)\n", fid->fid, |
|
retries); |
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
req = p9_client_rpc(clnt, P9_TCLUNK, "d", fid->fid); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RCLUNK fid %d\n", fid->fid); |
|
|
|
p9_tag_remove(clnt, req); |
|
error: |
|
/* |
|
* Fid is not valid even after a failed clunk |
|
* If interrupted, retry once then give up and |
|
* leak fid until umount. |
|
*/ |
|
if (err == -ERESTARTSYS) { |
|
if (retries++ == 0) |
|
goto again; |
|
} else |
|
p9_fid_destroy(fid); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_clunk); |
|
|
|
int p9_client_remove(struct p9_fid *fid) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TREMOVE fid %d\n", fid->fid); |
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
req = p9_client_rpc(clnt, P9_TREMOVE, "d", fid->fid); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREMOVE fid %d\n", fid->fid); |
|
|
|
p9_tag_remove(clnt, req); |
|
error: |
|
if (err == -ERESTARTSYS) |
|
p9_client_clunk(fid); |
|
else |
|
p9_fid_destroy(fid); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_remove); |
|
|
|
int p9_client_unlinkat(struct p9_fid *dfid, const char *name, int flags) |
|
{ |
|
int err = 0; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TUNLINKAT fid %d %s %d\n", |
|
dfid->fid, name, flags); |
|
|
|
clnt = dfid->clnt; |
|
req = p9_client_rpc(clnt, P9_TUNLINKAT, "dsd", dfid->fid, name, flags); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RUNLINKAT fid %d %s\n", dfid->fid, name); |
|
|
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_unlinkat); |
|
|
|
int |
|
p9_client_read(struct p9_fid *fid, u64 offset, struct iov_iter *to, int *err) |
|
{ |
|
int total = 0; |
|
*err = 0; |
|
|
|
while (iov_iter_count(to)) { |
|
int count; |
|
|
|
count = p9_client_read_once(fid, offset, to, err); |
|
if (!count || *err) |
|
break; |
|
offset += count; |
|
total += count; |
|
} |
|
return total; |
|
} |
|
EXPORT_SYMBOL(p9_client_read); |
|
|
|
int |
|
p9_client_read_once(struct p9_fid *fid, u64 offset, struct iov_iter *to, |
|
int *err) |
|
{ |
|
struct p9_client *clnt = fid->clnt; |
|
struct p9_req_t *req; |
|
int count = iov_iter_count(to); |
|
int rsize, non_zc = 0; |
|
char *dataptr; |
|
|
|
*err = 0; |
|
p9_debug(P9_DEBUG_9P, ">>> TREAD fid %d offset %llu %d\n", |
|
fid->fid, (unsigned long long) offset, (int)iov_iter_count(to)); |
|
|
|
rsize = fid->iounit; |
|
if (!rsize || rsize > clnt->msize - P9_IOHDRSZ) |
|
rsize = clnt->msize - P9_IOHDRSZ; |
|
|
|
if (count < rsize) |
|
rsize = count; |
|
|
|
/* Don't bother zerocopy for small IO (< 1024) */ |
|
if (clnt->trans_mod->zc_request && rsize > 1024) { |
|
/* response header len is 11 |
|
* PDU Header(7) + IO Size (4) |
|
*/ |
|
req = p9_client_zc_rpc(clnt, P9_TREAD, to, NULL, rsize, |
|
0, 11, "dqd", fid->fid, |
|
offset, rsize); |
|
} else { |
|
non_zc = 1; |
|
req = p9_client_rpc(clnt, P9_TREAD, "dqd", fid->fid, offset, |
|
rsize); |
|
} |
|
if (IS_ERR(req)) { |
|
*err = PTR_ERR(req); |
|
return 0; |
|
} |
|
|
|
*err = p9pdu_readf(&req->rc, clnt->proto_version, |
|
"D", &count, &dataptr); |
|
if (*err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
return 0; |
|
} |
|
if (rsize < count) { |
|
pr_err("bogus RREAD count (%d > %d)\n", count, rsize); |
|
count = rsize; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREAD count %d\n", count); |
|
|
|
if (non_zc) { |
|
int n = copy_to_iter(dataptr, count, to); |
|
|
|
if (n != count) { |
|
*err = -EFAULT; |
|
p9_tag_remove(clnt, req); |
|
return n; |
|
} |
|
} else { |
|
iov_iter_advance(to, count); |
|
} |
|
p9_tag_remove(clnt, req); |
|
return count; |
|
} |
|
EXPORT_SYMBOL(p9_client_read_once); |
|
|
|
int |
|
p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err) |
|
{ |
|
struct p9_client *clnt = fid->clnt; |
|
struct p9_req_t *req; |
|
int total = 0; |
|
*err = 0; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TWRITE fid %d offset %llu count %zd\n", |
|
fid->fid, (unsigned long long) offset, |
|
iov_iter_count(from)); |
|
|
|
while (iov_iter_count(from)) { |
|
int count = iov_iter_count(from); |
|
int rsize = fid->iounit; |
|
if (!rsize || rsize > clnt->msize-P9_IOHDRSZ) |
|
rsize = clnt->msize - P9_IOHDRSZ; |
|
|
|
if (count < rsize) |
|
rsize = count; |
|
|
|
/* Don't bother zerocopy for small IO (< 1024) */ |
|
if (clnt->trans_mod->zc_request && rsize > 1024) { |
|
req = p9_client_zc_rpc(clnt, P9_TWRITE, NULL, from, 0, |
|
rsize, P9_ZC_HDR_SZ, "dqd", |
|
fid->fid, offset, rsize); |
|
} else { |
|
req = p9_client_rpc(clnt, P9_TWRITE, "dqV", fid->fid, |
|
offset, rsize, from); |
|
} |
|
if (IS_ERR(req)) { |
|
*err = PTR_ERR(req); |
|
break; |
|
} |
|
|
|
*err = p9pdu_readf(&req->rc, clnt->proto_version, "d", &count); |
|
if (*err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
break; |
|
} |
|
if (rsize < count) { |
|
pr_err("bogus RWRITE count (%d > %d)\n", count, rsize); |
|
count = rsize; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count); |
|
|
|
p9_tag_remove(clnt, req); |
|
iov_iter_advance(from, count); |
|
total += count; |
|
offset += count; |
|
} |
|
return total; |
|
} |
|
EXPORT_SYMBOL(p9_client_write); |
|
|
|
struct p9_wstat *p9_client_stat(struct p9_fid *fid) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_wstat *ret = kmalloc(sizeof(struct p9_wstat), GFP_KERNEL); |
|
struct p9_req_t *req; |
|
u16 ignored; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TSTAT fid %d\n", fid->fid); |
|
|
|
if (!ret) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
req = p9_client_rpc(clnt, P9_TSTAT, "d", fid->fid); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "wS", &ignored, ret); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, |
|
"<<< RSTAT sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
|
"<<< mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" |
|
"<<< name=%s uid=%s gid=%s muid=%s extension=(%s)\n" |
|
"<<< uid=%d gid=%d n_muid=%d\n", |
|
ret->size, ret->type, ret->dev, ret->qid.type, |
|
(unsigned long long)ret->qid.path, ret->qid.version, ret->mode, |
|
ret->atime, ret->mtime, (unsigned long long)ret->length, |
|
ret->name, ret->uid, ret->gid, ret->muid, ret->extension, |
|
from_kuid(&init_user_ns, ret->n_uid), |
|
from_kgid(&init_user_ns, ret->n_gid), |
|
from_kuid(&init_user_ns, ret->n_muid)); |
|
|
|
p9_tag_remove(clnt, req); |
|
return ret; |
|
|
|
error: |
|
kfree(ret); |
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL(p9_client_stat); |
|
|
|
struct p9_stat_dotl *p9_client_getattr_dotl(struct p9_fid *fid, |
|
u64 request_mask) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_stat_dotl *ret = kmalloc(sizeof(struct p9_stat_dotl), |
|
GFP_KERNEL); |
|
struct p9_req_t *req; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TGETATTR fid %d, request_mask %lld\n", |
|
fid->fid, request_mask); |
|
|
|
if (!ret) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
req = p9_client_rpc(clnt, P9_TGETATTR, "dq", fid->fid, request_mask); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "A", ret); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, |
|
"<<< RGETATTR st_result_mask=%lld\n" |
|
"<<< qid=%x.%llx.%x\n" |
|
"<<< st_mode=%8.8x st_nlink=%llu\n" |
|
"<<< st_uid=%d st_gid=%d\n" |
|
"<<< st_rdev=%llx st_size=%llx st_blksize=%llu st_blocks=%llu\n" |
|
"<<< st_atime_sec=%lld st_atime_nsec=%lld\n" |
|
"<<< st_mtime_sec=%lld st_mtime_nsec=%lld\n" |
|
"<<< st_ctime_sec=%lld st_ctime_nsec=%lld\n" |
|
"<<< st_btime_sec=%lld st_btime_nsec=%lld\n" |
|
"<<< st_gen=%lld st_data_version=%lld\n", |
|
ret->st_result_mask, ret->qid.type, ret->qid.path, |
|
ret->qid.version, ret->st_mode, ret->st_nlink, |
|
from_kuid(&init_user_ns, ret->st_uid), |
|
from_kgid(&init_user_ns, ret->st_gid), |
|
ret->st_rdev, ret->st_size, ret->st_blksize, |
|
ret->st_blocks, ret->st_atime_sec, ret->st_atime_nsec, |
|
ret->st_mtime_sec, ret->st_mtime_nsec, ret->st_ctime_sec, |
|
ret->st_ctime_nsec, ret->st_btime_sec, ret->st_btime_nsec, |
|
ret->st_gen, ret->st_data_version); |
|
|
|
p9_tag_remove(clnt, req); |
|
return ret; |
|
|
|
error: |
|
kfree(ret); |
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL(p9_client_getattr_dotl); |
|
|
|
static int p9_client_statsize(struct p9_wstat *wst, int proto_version) |
|
{ |
|
int ret; |
|
|
|
/* NOTE: size shouldn't include its own length */ |
|
/* size[2] type[2] dev[4] qid[13] */ |
|
/* mode[4] atime[4] mtime[4] length[8]*/ |
|
/* name[s] uid[s] gid[s] muid[s] */ |
|
ret = 2+4+13+4+4+4+8+2+2+2+2; |
|
|
|
if (wst->name) |
|
ret += strlen(wst->name); |
|
if (wst->uid) |
|
ret += strlen(wst->uid); |
|
if (wst->gid) |
|
ret += strlen(wst->gid); |
|
if (wst->muid) |
|
ret += strlen(wst->muid); |
|
|
|
if ((proto_version == p9_proto_2000u) || |
|
(proto_version == p9_proto_2000L)) { |
|
ret += 2+4+4+4; /* extension[s] n_uid[4] n_gid[4] n_muid[4] */ |
|
if (wst->extension) |
|
ret += strlen(wst->extension); |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
int p9_client_wstat(struct p9_fid *fid, struct p9_wstat *wst) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
wst->size = p9_client_statsize(wst, clnt->proto_version); |
|
p9_debug(P9_DEBUG_9P, ">>> TWSTAT fid %d\n", fid->fid); |
|
p9_debug(P9_DEBUG_9P, |
|
" sz=%x type=%x dev=%x qid=%x.%llx.%x\n" |
|
" mode=%8.8x atime=%8.8x mtime=%8.8x length=%llx\n" |
|
" name=%s uid=%s gid=%s muid=%s extension=(%s)\n" |
|
" uid=%d gid=%d n_muid=%d\n", |
|
wst->size, wst->type, wst->dev, wst->qid.type, |
|
(unsigned long long)wst->qid.path, wst->qid.version, wst->mode, |
|
wst->atime, wst->mtime, (unsigned long long)wst->length, |
|
wst->name, wst->uid, wst->gid, wst->muid, wst->extension, |
|
from_kuid(&init_user_ns, wst->n_uid), |
|
from_kgid(&init_user_ns, wst->n_gid), |
|
from_kuid(&init_user_ns, wst->n_muid)); |
|
|
|
req = p9_client_rpc(clnt, P9_TWSTAT, "dwS", fid->fid, wst->size+2, wst); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RWSTAT fid %d\n", fid->fid); |
|
|
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_wstat); |
|
|
|
int p9_client_setattr(struct p9_fid *fid, struct p9_iattr_dotl *p9attr) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
p9_debug(P9_DEBUG_9P, ">>> TSETATTR fid %d\n", fid->fid); |
|
p9_debug(P9_DEBUG_9P, |
|
" valid=%x mode=%x uid=%d gid=%d size=%lld\n" |
|
" atime_sec=%lld atime_nsec=%lld\n" |
|
" mtime_sec=%lld mtime_nsec=%lld\n", |
|
p9attr->valid, p9attr->mode, |
|
from_kuid(&init_user_ns, p9attr->uid), |
|
from_kgid(&init_user_ns, p9attr->gid), |
|
p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, |
|
p9attr->mtime_sec, p9attr->mtime_nsec); |
|
|
|
req = p9_client_rpc(clnt, P9_TSETATTR, "dI", fid->fid, p9attr); |
|
|
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RSETATTR fid %d\n", fid->fid); |
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_setattr); |
|
|
|
int p9_client_statfs(struct p9_fid *fid, struct p9_rstatfs *sb) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TSTATFS fid %d\n", fid->fid); |
|
|
|
req = p9_client_rpc(clnt, P9_TSTATFS, "d", fid->fid); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "ddqqqqqqd", &sb->type, |
|
&sb->bsize, &sb->blocks, &sb->bfree, &sb->bavail, |
|
&sb->files, &sb->ffree, &sb->fsid, &sb->namelen); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RSTATFS fid %d type 0x%lx bsize %ld " |
|
"blocks %llu bfree %llu bavail %llu files %llu ffree %llu " |
|
"fsid %llu namelen %ld\n", |
|
fid->fid, (long unsigned int)sb->type, (long int)sb->bsize, |
|
sb->blocks, sb->bfree, sb->bavail, sb->files, sb->ffree, |
|
sb->fsid, (long int)sb->namelen); |
|
|
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_statfs); |
|
|
|
int p9_client_rename(struct p9_fid *fid, |
|
struct p9_fid *newdirfid, const char *name) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TRENAME fid %d newdirfid %d name %s\n", |
|
fid->fid, newdirfid->fid, name); |
|
|
|
req = p9_client_rpc(clnt, P9_TRENAME, "dds", fid->fid, |
|
newdirfid->fid, name); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RRENAME fid %d\n", fid->fid); |
|
|
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_rename); |
|
|
|
int p9_client_renameat(struct p9_fid *olddirfid, const char *old_name, |
|
struct p9_fid *newdirfid, const char *new_name) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
|
|
err = 0; |
|
clnt = olddirfid->clnt; |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TRENAMEAT olddirfid %d old name %s" |
|
" newdirfid %d new name %s\n", olddirfid->fid, old_name, |
|
newdirfid->fid, new_name); |
|
|
|
req = p9_client_rpc(clnt, P9_TRENAMEAT, "dsds", olddirfid->fid, |
|
old_name, newdirfid->fid, new_name); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RRENAMEAT newdirfid %d new name %s\n", |
|
newdirfid->fid, new_name); |
|
|
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_renameat); |
|
|
|
/* |
|
* An xattrwalk without @attr_name gives the fid for the lisxattr namespace |
|
*/ |
|
struct p9_fid *p9_client_xattrwalk(struct p9_fid *file_fid, |
|
const char *attr_name, u64 *attr_size) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
struct p9_fid *attr_fid; |
|
|
|
err = 0; |
|
clnt = file_fid->clnt; |
|
attr_fid = p9_fid_create(clnt); |
|
if (!attr_fid) { |
|
err = -ENOMEM; |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, |
|
">>> TXATTRWALK file_fid %d, attr_fid %d name %s\n", |
|
file_fid->fid, attr_fid->fid, attr_name); |
|
|
|
req = p9_client_rpc(clnt, P9_TXATTRWALK, "dds", |
|
file_fid->fid, attr_fid->fid, attr_name); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "q", attr_size); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
p9_tag_remove(clnt, req); |
|
goto clunk_fid; |
|
} |
|
p9_tag_remove(clnt, req); |
|
p9_debug(P9_DEBUG_9P, "<<< RXATTRWALK fid %d size %llu\n", |
|
attr_fid->fid, *attr_size); |
|
return attr_fid; |
|
clunk_fid: |
|
p9_client_clunk(attr_fid); |
|
attr_fid = NULL; |
|
error: |
|
if (attr_fid && (attr_fid != file_fid)) |
|
p9_fid_destroy(attr_fid); |
|
|
|
return ERR_PTR(err); |
|
} |
|
EXPORT_SYMBOL_GPL(p9_client_xattrwalk); |
|
|
|
int p9_client_xattrcreate(struct p9_fid *fid, const char *name, |
|
u64 attr_size, int flags) |
|
{ |
|
int err; |
|
struct p9_req_t *req; |
|
struct p9_client *clnt; |
|
|
|
p9_debug(P9_DEBUG_9P, |
|
">>> TXATTRCREATE fid %d name %s size %lld flag %d\n", |
|
fid->fid, name, (long long)attr_size, flags); |
|
err = 0; |
|
clnt = fid->clnt; |
|
req = p9_client_rpc(clnt, P9_TXATTRCREATE, "dsqd", |
|
fid->fid, name, attr_size, flags); |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RXATTRCREATE fid %d\n", fid->fid); |
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL_GPL(p9_client_xattrcreate); |
|
|
|
int p9_client_readdir(struct p9_fid *fid, char *data, u32 count, u64 offset) |
|
{ |
|
int err, rsize, non_zc = 0; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
char *dataptr; |
|
struct kvec kv = {.iov_base = data, .iov_len = count}; |
|
struct iov_iter to; |
|
|
|
iov_iter_kvec(&to, READ, &kv, 1, count); |
|
|
|
p9_debug(P9_DEBUG_9P, ">>> TREADDIR fid %d offset %llu count %d\n", |
|
fid->fid, (unsigned long long) offset, count); |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
|
|
rsize = fid->iounit; |
|
if (!rsize || rsize > clnt->msize-P9_READDIRHDRSZ) |
|
rsize = clnt->msize - P9_READDIRHDRSZ; |
|
|
|
if (count < rsize) |
|
rsize = count; |
|
|
|
/* Don't bother zerocopy for small IO (< 1024) */ |
|
if (clnt->trans_mod->zc_request && rsize > 1024) { |
|
/* |
|
* response header len is 11 |
|
* PDU Header(7) + IO Size (4) |
|
*/ |
|
req = p9_client_zc_rpc(clnt, P9_TREADDIR, &to, NULL, rsize, 0, |
|
11, "dqd", fid->fid, offset, rsize); |
|
} else { |
|
non_zc = 1; |
|
req = p9_client_rpc(clnt, P9_TREADDIR, "dqd", fid->fid, |
|
offset, rsize); |
|
} |
|
if (IS_ERR(req)) { |
|
err = PTR_ERR(req); |
|
goto error; |
|
} |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "D", &count, &dataptr); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto free_and_error; |
|
} |
|
if (rsize < count) { |
|
pr_err("bogus RREADDIR count (%d > %d)\n", count, rsize); |
|
count = rsize; |
|
} |
|
|
|
p9_debug(P9_DEBUG_9P, "<<< RREADDIR count %d\n", count); |
|
|
|
if (non_zc) |
|
memmove(data, dataptr, count); |
|
|
|
p9_tag_remove(clnt, req); |
|
return count; |
|
|
|
free_and_error: |
|
p9_tag_remove(clnt, req); |
|
error: |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_readdir); |
|
|
|
int p9_client_mknod_dotl(struct p9_fid *fid, const char *name, int mode, |
|
dev_t rdev, kgid_t gid, struct p9_qid *qid) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
p9_debug(P9_DEBUG_9P, ">>> TMKNOD fid %d name %s mode %d major %d " |
|
"minor %d\n", fid->fid, name, mode, MAJOR(rdev), MINOR(rdev)); |
|
req = p9_client_rpc(clnt, P9_TMKNOD, "dsdddg", fid->fid, name, mode, |
|
MAJOR(rdev), MINOR(rdev), gid); |
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RMKNOD qid %x.%llx.%x\n", qid->type, |
|
(unsigned long long)qid->path, qid->version); |
|
|
|
error: |
|
p9_tag_remove(clnt, req); |
|
return err; |
|
|
|
} |
|
EXPORT_SYMBOL(p9_client_mknod_dotl); |
|
|
|
int p9_client_mkdir_dotl(struct p9_fid *fid, const char *name, int mode, |
|
kgid_t gid, struct p9_qid *qid) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
p9_debug(P9_DEBUG_9P, ">>> TMKDIR fid %d name %s mode %d gid %d\n", |
|
fid->fid, name, mode, from_kgid(&init_user_ns, gid)); |
|
req = p9_client_rpc(clnt, P9_TMKDIR, "dsdg", fid->fid, name, mode, |
|
gid); |
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "Q", qid); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RMKDIR qid %x.%llx.%x\n", qid->type, |
|
(unsigned long long)qid->path, qid->version); |
|
|
|
error: |
|
p9_tag_remove(clnt, req); |
|
return err; |
|
|
|
} |
|
EXPORT_SYMBOL(p9_client_mkdir_dotl); |
|
|
|
int p9_client_lock_dotl(struct p9_fid *fid, struct p9_flock *flock, u8 *status) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
p9_debug(P9_DEBUG_9P, ">>> TLOCK fid %d type %i flags %d " |
|
"start %lld length %lld proc_id %d client_id %s\n", |
|
fid->fid, flock->type, flock->flags, flock->start, |
|
flock->length, flock->proc_id, flock->client_id); |
|
|
|
req = p9_client_rpc(clnt, P9_TLOCK, "dbdqqds", fid->fid, flock->type, |
|
flock->flags, flock->start, flock->length, |
|
flock->proc_id, flock->client_id); |
|
|
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "b", status); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RLOCK status %i\n", *status); |
|
error: |
|
p9_tag_remove(clnt, req); |
|
return err; |
|
|
|
} |
|
EXPORT_SYMBOL(p9_client_lock_dotl); |
|
|
|
int p9_client_getlock_dotl(struct p9_fid *fid, struct p9_getlock *glock) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
p9_debug(P9_DEBUG_9P, ">>> TGETLOCK fid %d, type %i start %lld " |
|
"length %lld proc_id %d client_id %s\n", fid->fid, glock->type, |
|
glock->start, glock->length, glock->proc_id, glock->client_id); |
|
|
|
req = p9_client_rpc(clnt, P9_TGETLOCK, "dbqqds", fid->fid, glock->type, |
|
glock->start, glock->length, glock->proc_id, glock->client_id); |
|
|
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "bqqds", &glock->type, |
|
&glock->start, &glock->length, &glock->proc_id, |
|
&glock->client_id); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RGETLOCK type %i start %lld length %lld " |
|
"proc_id %d client_id %s\n", glock->type, glock->start, |
|
glock->length, glock->proc_id, glock->client_id); |
|
error: |
|
p9_tag_remove(clnt, req); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_getlock_dotl); |
|
|
|
int p9_client_readlink(struct p9_fid *fid, char **target) |
|
{ |
|
int err; |
|
struct p9_client *clnt; |
|
struct p9_req_t *req; |
|
|
|
err = 0; |
|
clnt = fid->clnt; |
|
p9_debug(P9_DEBUG_9P, ">>> TREADLINK fid %d\n", fid->fid); |
|
|
|
req = p9_client_rpc(clnt, P9_TREADLINK, "d", fid->fid); |
|
if (IS_ERR(req)) |
|
return PTR_ERR(req); |
|
|
|
err = p9pdu_readf(&req->rc, clnt->proto_version, "s", target); |
|
if (err) { |
|
trace_9p_protocol_dump(clnt, &req->rc); |
|
goto error; |
|
} |
|
p9_debug(P9_DEBUG_9P, "<<< RREADLINK target %s\n", *target); |
|
error: |
|
p9_tag_remove(clnt, req); |
|
return err; |
|
} |
|
EXPORT_SYMBOL(p9_client_readlink); |
|
|
|
int __init p9_client_init(void) |
|
{ |
|
p9_req_cache = KMEM_CACHE(p9_req_t, SLAB_TYPESAFE_BY_RCU); |
|
return p9_req_cache ? 0 : -ENOMEM; |
|
} |
|
|
|
void __exit p9_client_exit(void) |
|
{ |
|
kmem_cache_destroy(p9_req_cache); |
|
}
|
|
|