mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 11:56:40 +07:00
eeff66ef6e
Without this we can cause reclaim allocation in writepage. [ 3433.448430] ================================= [ 3433.449117] [ INFO: inconsistent lock state ] [ 3433.449117] 2.6.38-rc5+ #84 [ 3433.449117] --------------------------------- [ 3433.449117] inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-R} usage. [ 3433.449117] kswapd0/505 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 3433.449117] (iprune_sem){+++++-}, at: [<ffffffff810ebbab>] shrink_icache_memory+0x45/0x2b1 [ 3433.449117] {RECLAIM_FS-ON-W} state was registered at: [ 3433.449117] [<ffffffff8107fe5f>] mark_held_locks+0x52/0x70 [ 3433.449117] [<ffffffff8107ff02>] lockdep_trace_alloc+0x85/0x9f [ 3433.449117] [<ffffffff810d353d>] slab_pre_alloc_hook+0x18/0x3c [ 3433.449117] [<ffffffff810d3fd5>] kmem_cache_alloc+0x23/0xa2 [ 3433.449117] [<ffffffff8127be77>] idr_pre_get+0x2d/0x6f [ 3433.449117] [<ffffffff815434eb>] p9_idpool_get+0x30/0xae [ 3433.449117] [<ffffffff81540123>] p9_client_rpc+0xd7/0x9b0 [ 3433.449117] [<ffffffff815427b0>] p9_client_clunk+0x88/0xdb [ 3433.449117] [<ffffffff811d56e5>] v9fs_evict_inode+0x3c/0x48 [ 3433.449117] [<ffffffff810eb511>] evict+0x1f/0x87 [ 3433.449117] [<ffffffff810eb5c0>] dispose_list+0x47/0xe3 [ 3433.449117] [<ffffffff810eb8da>] evict_inodes+0x138/0x14f [ 3433.449117] [<ffffffff810d90e2>] generic_shutdown_super+0x57/0xe8 [ 3433.449117] [<ffffffff810d91e8>] kill_anon_super+0x11/0x50 [ 3433.449117] [<ffffffff811d4951>] v9fs_kill_super+0x49/0xab [ 3433.449117] [<ffffffff810d926e>] deactivate_locked_super+0x21/0x46 [ 3433.449117] [<ffffffff810d9e84>] deactivate_super+0x40/0x44 [ 3433.449117] [<ffffffff810ef848>] mntput_no_expire+0x100/0x109 [ 3433.449117] [<ffffffff810f0aeb>] sys_umount+0x2f1/0x31c [ 3433.449117] [<ffffffff8102c87b>] system_call_fastpath+0x16/0x1b [ 3433.449117] irq event stamp: 192941 [ 3433.449117] hardirqs last enabled at (192941): [<ffffffff81568dcf>] _raw_spin_unlock_irq+0x2b/0x30 [ 3433.449117] hardirqs last disabled at (192940): [<ffffffff810b5f97>] shrink_inactive_list+0x290/0x2f5 [ 3433.449117] softirqs last enabled at (188470): [<ffffffff8105fd65>] __do_softirq+0x133/0x152 [ 3433.449117] softirqs last disabled at (188455): [<ffffffff8102d7cc>] call_softirq+0x1c/0x28 [ 3433.449117] [ 3433.449117] other info that might help us debug this: [ 3433.449117] 1 lock held by kswapd0/505: [ 3433.449117] #0: (shrinker_rwsem){++++..}, at: [<ffffffff810b52e2>] shrink_slab+0x38/0x15f [ 3433.449117] [ 3433.449117] stack backtrace: [ 3433.449117] Pid: 505, comm: kswapd0 Not tainted 2.6.38-rc5+ #84 [ 3433.449117] Call Trace: [ 3433.449117] [<ffffffff8107fbce>] ? valid_state+0x17e/0x191 [ 3433.449117] [<ffffffff81036896>] ? save_stack_trace+0x28/0x45 [ 3433.449117] [<ffffffff81080426>] ? check_usage_forwards+0x0/0x87 [ 3433.449117] [<ffffffff8107fcf4>] ? mark_lock+0x113/0x22c [ 3433.449117] [<ffffffff8108105f>] ? __lock_acquire+0x37a/0xcf7 [ 3433.449117] [<ffffffff8107fc0e>] ? mark_lock+0x2d/0x22c [ 3433.449117] [<ffffffff81081077>] ? __lock_acquire+0x392/0xcf7 [ 3433.449117] [<ffffffff810b14d2>] ? determine_dirtyable_memory+0x15/0x28 [ 3433.449117] [<ffffffff81081a33>] ? lock_acquire+0x57/0x6d [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff81567d85>] ? down_read+0x47/0x5c [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff810ebbab>] ? shrink_icache_memory+0x45/0x2b1 [ 3433.449117] [<ffffffff810b5385>] ? shrink_slab+0xdb/0x15f [ 3433.449117] [<ffffffff810b69bc>] ? kswapd+0x574/0x96a [ 3433.449117] [<ffffffff810b6448>] ? kswapd+0x0/0x96a [ 3433.449117] [<ffffffff810714e2>] ? kthread+0x7d/0x85 [ 3433.449117] [<ffffffff8102d6d4>] ? kernel_thread_helper+0x4/0x10 [ 3433.449117] [<ffffffff81569200>] ? restore_args+0x0/0x30 [ 3433.449117] [<ffffffff81071465>] ? kthread+0x0/0x85 [ 3433.449117] [<ffffffff8102d6d0>] ? kernel_thread_helper+0x0/0x10 Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
681 lines
14 KiB
C
681 lines
14 KiB
C
/*
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* net/9p/protocol.c
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*
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* 9P Protocol Support Code
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*
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* Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com>
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*
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* Base on code from Anthony Liguori <aliguori@us.ibm.com>
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* Copyright (C) 2008 by IBM, Corp.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to:
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02111-1301 USA
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*
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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/kernel.h>
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#include <linux/uaccess.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <net/9p/9p.h>
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#include <net/9p/client.h>
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#include "protocol.h"
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static int
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p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...);
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#ifdef CONFIG_NET_9P_DEBUG
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void
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p9pdu_dump(int way, struct p9_fcall *pdu)
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{
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int i, n;
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u8 *data = pdu->sdata;
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int datalen = pdu->size;
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char buf[255];
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int buflen = 255;
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i = n = 0;
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if (datalen > (buflen-16))
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datalen = buflen-16;
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while (i < datalen) {
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n += scnprintf(buf + n, buflen - n, "%02x ", data[i]);
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if (i%4 == 3)
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n += scnprintf(buf + n, buflen - n, " ");
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if (i%32 == 31)
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n += scnprintf(buf + n, buflen - n, "\n");
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i++;
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}
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n += scnprintf(buf + n, buflen - n, "\n");
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if (way)
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P9_DPRINTK(P9_DEBUG_PKT, "[[[(%d) %s\n", datalen, buf);
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else
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P9_DPRINTK(P9_DEBUG_PKT, "]]](%d) %s\n", datalen, buf);
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}
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#else
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void
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p9pdu_dump(int way, struct p9_fcall *pdu)
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{
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}
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#endif
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EXPORT_SYMBOL(p9pdu_dump);
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void p9stat_free(struct p9_wstat *stbuf)
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{
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kfree(stbuf->name);
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kfree(stbuf->uid);
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kfree(stbuf->gid);
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kfree(stbuf->muid);
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kfree(stbuf->extension);
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}
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EXPORT_SYMBOL(p9stat_free);
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static size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size)
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{
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size_t len = min(pdu->size - pdu->offset, size);
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memcpy(data, &pdu->sdata[pdu->offset], len);
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pdu->offset += len;
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return size - len;
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}
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static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size)
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{
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size_t len = min(pdu->capacity - pdu->size, size);
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memcpy(&pdu->sdata[pdu->size], data, len);
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pdu->size += len;
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return size - len;
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}
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static size_t
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pdu_write_u(struct p9_fcall *pdu, const char __user *udata, size_t size)
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{
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size_t len = min(pdu->capacity - pdu->size, size);
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if (copy_from_user(&pdu->sdata[pdu->size], udata, len))
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len = 0;
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pdu->size += len;
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return size - len;
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}
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static size_t
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pdu_write_urw(struct p9_fcall *pdu, const char *kdata, const char __user *udata,
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size_t size)
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{
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BUG_ON(pdu->size > P9_IOHDRSZ);
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pdu->pubuf = (char __user *)udata;
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pdu->pkbuf = (char *)kdata;
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pdu->pbuf_size = size;
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return 0;
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}
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static size_t
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pdu_write_readdir(struct p9_fcall *pdu, const char *kdata, size_t size)
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{
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BUG_ON(pdu->size > P9_READDIRHDRSZ);
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pdu->pkbuf = (char *)kdata;
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pdu->pbuf_size = size;
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return 0;
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}
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/*
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b - int8_t
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w - int16_t
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d - int32_t
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q - int64_t
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s - string
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S - stat
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Q - qid
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D - data blob (int32_t size followed by void *, results are not freed)
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T - array of strings (int16_t count, followed by strings)
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R - array of qids (int16_t count, followed by qids)
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A - stat for 9p2000.L (p9_stat_dotl)
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? - if optional = 1, continue parsing
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*/
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static int
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p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt,
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va_list ap)
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{
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const char *ptr;
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int errcode = 0;
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for (ptr = fmt; *ptr; ptr++) {
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switch (*ptr) {
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case 'b':{
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int8_t *val = va_arg(ap, int8_t *);
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if (pdu_read(pdu, val, sizeof(*val))) {
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errcode = -EFAULT;
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break;
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}
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}
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break;
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case 'w':{
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int16_t *val = va_arg(ap, int16_t *);
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__le16 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*val = le16_to_cpu(le_val);
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}
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break;
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case 'd':{
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int32_t *val = va_arg(ap, int32_t *);
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__le32 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*val = le32_to_cpu(le_val);
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}
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break;
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case 'q':{
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int64_t *val = va_arg(ap, int64_t *);
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__le64 le_val;
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if (pdu_read(pdu, &le_val, sizeof(le_val))) {
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errcode = -EFAULT;
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break;
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}
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*val = le64_to_cpu(le_val);
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}
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break;
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case 's':{
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char **sptr = va_arg(ap, char **);
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uint16_t len;
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errcode = p9pdu_readf(pdu, proto_version,
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"w", &len);
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if (errcode)
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break;
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*sptr = kmalloc(len + 1, GFP_NOFS);
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if (*sptr == NULL) {
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errcode = -EFAULT;
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break;
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}
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if (pdu_read(pdu, *sptr, len)) {
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errcode = -EFAULT;
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kfree(*sptr);
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*sptr = NULL;
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} else
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(*sptr)[len] = 0;
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}
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break;
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case 'Q':{
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struct p9_qid *qid =
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va_arg(ap, struct p9_qid *);
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errcode = p9pdu_readf(pdu, proto_version, "bdq",
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&qid->type, &qid->version,
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&qid->path);
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}
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break;
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case 'S':{
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struct p9_wstat *stbuf =
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va_arg(ap, struct p9_wstat *);
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memset(stbuf, 0, sizeof(struct p9_wstat));
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stbuf->n_uid = stbuf->n_gid = stbuf->n_muid =
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-1;
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errcode =
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p9pdu_readf(pdu, proto_version,
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"wwdQdddqssss?sddd",
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&stbuf->size, &stbuf->type,
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&stbuf->dev, &stbuf->qid,
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&stbuf->mode, &stbuf->atime,
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&stbuf->mtime, &stbuf->length,
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&stbuf->name, &stbuf->uid,
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&stbuf->gid, &stbuf->muid,
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&stbuf->extension,
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&stbuf->n_uid, &stbuf->n_gid,
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&stbuf->n_muid);
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if (errcode)
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p9stat_free(stbuf);
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}
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break;
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case 'D':{
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uint32_t *count = va_arg(ap, uint32_t *);
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void **data = va_arg(ap, void **);
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errcode =
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p9pdu_readf(pdu, proto_version, "d", count);
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if (!errcode) {
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*count =
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min_t(uint32_t, *count,
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pdu->size - pdu->offset);
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*data = &pdu->sdata[pdu->offset];
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}
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}
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break;
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case 'T':{
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int16_t *nwname = va_arg(ap, int16_t *);
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char ***wnames = va_arg(ap, char ***);
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errcode = p9pdu_readf(pdu, proto_version,
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"w", nwname);
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if (!errcode) {
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*wnames =
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kmalloc(sizeof(char *) * *nwname,
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GFP_NOFS);
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if (!*wnames)
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errcode = -ENOMEM;
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}
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if (!errcode) {
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int i;
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for (i = 0; i < *nwname; i++) {
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errcode =
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p9pdu_readf(pdu,
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proto_version,
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"s",
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&(*wnames)[i]);
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if (errcode)
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break;
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}
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}
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if (errcode) {
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if (*wnames) {
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int i;
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for (i = 0; i < *nwname; i++)
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kfree((*wnames)[i]);
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}
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kfree(*wnames);
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*wnames = NULL;
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}
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}
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break;
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case 'R':{
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int16_t *nwqid = va_arg(ap, int16_t *);
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struct p9_qid **wqids =
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va_arg(ap, struct p9_qid **);
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*wqids = NULL;
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errcode =
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p9pdu_readf(pdu, proto_version, "w", nwqid);
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if (!errcode) {
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*wqids =
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kmalloc(*nwqid *
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sizeof(struct p9_qid),
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GFP_NOFS);
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if (*wqids == NULL)
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errcode = -ENOMEM;
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}
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if (!errcode) {
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int i;
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for (i = 0; i < *nwqid; i++) {
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errcode =
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p9pdu_readf(pdu,
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proto_version,
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"Q",
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&(*wqids)[i]);
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if (errcode)
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break;
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}
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}
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if (errcode) {
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kfree(*wqids);
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*wqids = NULL;
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}
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}
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break;
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case 'A': {
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struct p9_stat_dotl *stbuf =
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va_arg(ap, struct p9_stat_dotl *);
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memset(stbuf, 0, sizeof(struct p9_stat_dotl));
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errcode =
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p9pdu_readf(pdu, proto_version,
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"qQdddqqqqqqqqqqqqqqq",
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&stbuf->st_result_mask,
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&stbuf->qid,
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&stbuf->st_mode,
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&stbuf->st_uid, &stbuf->st_gid,
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&stbuf->st_nlink,
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&stbuf->st_rdev, &stbuf->st_size,
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&stbuf->st_blksize, &stbuf->st_blocks,
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&stbuf->st_atime_sec,
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&stbuf->st_atime_nsec,
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&stbuf->st_mtime_sec,
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&stbuf->st_mtime_nsec,
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&stbuf->st_ctime_sec,
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&stbuf->st_ctime_nsec,
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&stbuf->st_btime_sec,
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&stbuf->st_btime_nsec,
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&stbuf->st_gen,
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&stbuf->st_data_version);
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}
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break;
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case '?':
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if ((proto_version != p9_proto_2000u) &&
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(proto_version != p9_proto_2000L))
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return 0;
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break;
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default:
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BUG();
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break;
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}
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if (errcode)
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break;
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}
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return errcode;
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}
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int
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p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt,
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va_list ap)
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{
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const char *ptr;
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int errcode = 0;
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for (ptr = fmt; *ptr; ptr++) {
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switch (*ptr) {
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case 'b':{
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int8_t val = va_arg(ap, int);
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if (pdu_write(pdu, &val, sizeof(val)))
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errcode = -EFAULT;
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}
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break;
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case 'w':{
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__le16 val = cpu_to_le16(va_arg(ap, int));
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if (pdu_write(pdu, &val, sizeof(val)))
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errcode = -EFAULT;
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}
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break;
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case 'd':{
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__le32 val = cpu_to_le32(va_arg(ap, int32_t));
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'q':{
|
|
__le64 val = cpu_to_le64(va_arg(ap, int64_t));
|
|
if (pdu_write(pdu, &val, sizeof(val)))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 's':{
|
|
const char *sptr = va_arg(ap, const char *);
|
|
uint16_t len = 0;
|
|
if (sptr)
|
|
len = min_t(uint16_t, strlen(sptr),
|
|
USHRT_MAX);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version,
|
|
"w", len);
|
|
if (!errcode && pdu_write(pdu, sptr, len))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'Q':{
|
|
const struct p9_qid *qid =
|
|
va_arg(ap, const struct p9_qid *);
|
|
errcode =
|
|
p9pdu_writef(pdu, proto_version, "bdq",
|
|
qid->type, qid->version,
|
|
qid->path);
|
|
} break;
|
|
case 'S':{
|
|
const struct p9_wstat *stbuf =
|
|
va_arg(ap, const struct p9_wstat *);
|
|
errcode =
|
|
p9pdu_writef(pdu, proto_version,
|
|
"wwdQdddqssss?sddd",
|
|
stbuf->size, stbuf->type,
|
|
stbuf->dev, &stbuf->qid,
|
|
stbuf->mode, stbuf->atime,
|
|
stbuf->mtime, stbuf->length,
|
|
stbuf->name, stbuf->uid,
|
|
stbuf->gid, stbuf->muid,
|
|
stbuf->extension, stbuf->n_uid,
|
|
stbuf->n_gid, stbuf->n_muid);
|
|
} break;
|
|
case 'D':{
|
|
uint32_t count = va_arg(ap, uint32_t);
|
|
const void *data = va_arg(ap, const void *);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version, "d",
|
|
count);
|
|
if (!errcode && pdu_write(pdu, data, count))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'E':{
|
|
int32_t cnt = va_arg(ap, int32_t);
|
|
const char *k = va_arg(ap, const void *);
|
|
const char *u = va_arg(ap, const void *);
|
|
errcode = p9pdu_writef(pdu, proto_version, "d",
|
|
cnt);
|
|
if (!errcode && pdu_write_urw(pdu, k, u, cnt))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'F':{
|
|
int32_t cnt = va_arg(ap, int32_t);
|
|
const char *k = va_arg(ap, const void *);
|
|
errcode = p9pdu_writef(pdu, proto_version, "d",
|
|
cnt);
|
|
if (!errcode && pdu_write_readdir(pdu, k, cnt))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'U':{
|
|
int32_t count = va_arg(ap, int32_t);
|
|
const char __user *udata =
|
|
va_arg(ap, const void __user *);
|
|
errcode = p9pdu_writef(pdu, proto_version, "d",
|
|
count);
|
|
if (!errcode && pdu_write_u(pdu, udata, count))
|
|
errcode = -EFAULT;
|
|
}
|
|
break;
|
|
case 'T':{
|
|
int16_t nwname = va_arg(ap, int);
|
|
const char **wnames = va_arg(ap, const char **);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version, "w",
|
|
nwname);
|
|
if (!errcode) {
|
|
int i;
|
|
|
|
for (i = 0; i < nwname; i++) {
|
|
errcode =
|
|
p9pdu_writef(pdu,
|
|
proto_version,
|
|
"s",
|
|
wnames[i]);
|
|
if (errcode)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case 'R':{
|
|
int16_t nwqid = va_arg(ap, int);
|
|
struct p9_qid *wqids =
|
|
va_arg(ap, struct p9_qid *);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version, "w",
|
|
nwqid);
|
|
if (!errcode) {
|
|
int i;
|
|
|
|
for (i = 0; i < nwqid; i++) {
|
|
errcode =
|
|
p9pdu_writef(pdu,
|
|
proto_version,
|
|
"Q",
|
|
&wqids[i]);
|
|
if (errcode)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
case 'I':{
|
|
struct p9_iattr_dotl *p9attr = va_arg(ap,
|
|
struct p9_iattr_dotl *);
|
|
|
|
errcode = p9pdu_writef(pdu, proto_version,
|
|
"ddddqqqqq",
|
|
p9attr->valid,
|
|
p9attr->mode,
|
|
p9attr->uid,
|
|
p9attr->gid,
|
|
p9attr->size,
|
|
p9attr->atime_sec,
|
|
p9attr->atime_nsec,
|
|
p9attr->mtime_sec,
|
|
p9attr->mtime_nsec);
|
|
}
|
|
break;
|
|
case '?':
|
|
if ((proto_version != p9_proto_2000u) &&
|
|
(proto_version != p9_proto_2000L))
|
|
return 0;
|
|
break;
|
|
default:
|
|
BUG();
|
|
break;
|
|
}
|
|
|
|
if (errcode)
|
|
break;
|
|
}
|
|
|
|
return errcode;
|
|
}
|
|
|
|
int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap, fmt);
|
|
ret = p9pdu_vreadf(pdu, proto_version, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret;
|
|
|
|
va_start(ap, fmt);
|
|
ret = p9pdu_vwritef(pdu, proto_version, fmt, ap);
|
|
va_end(ap);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int p9stat_read(char *buf, int len, struct p9_wstat *st, int proto_version)
|
|
{
|
|
struct p9_fcall fake_pdu;
|
|
int ret;
|
|
|
|
fake_pdu.size = len;
|
|
fake_pdu.capacity = len;
|
|
fake_pdu.sdata = buf;
|
|
fake_pdu.offset = 0;
|
|
|
|
ret = p9pdu_readf(&fake_pdu, proto_version, "S", st);
|
|
if (ret) {
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret);
|
|
p9pdu_dump(1, &fake_pdu);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(p9stat_read);
|
|
|
|
int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type)
|
|
{
|
|
pdu->id = type;
|
|
return p9pdu_writef(pdu, 0, "dbw", 0, type, tag);
|
|
}
|
|
|
|
int p9pdu_finalize(struct p9_fcall *pdu)
|
|
{
|
|
int size = pdu->size;
|
|
int err;
|
|
|
|
pdu->size = 0;
|
|
err = p9pdu_writef(pdu, 0, "d", size);
|
|
pdu->size = size;
|
|
|
|
#ifdef CONFIG_NET_9P_DEBUG
|
|
if ((p9_debug_level & P9_DEBUG_PKT) == P9_DEBUG_PKT)
|
|
p9pdu_dump(0, pdu);
|
|
#endif
|
|
|
|
P9_DPRINTK(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size,
|
|
pdu->id, pdu->tag);
|
|
|
|
return err;
|
|
}
|
|
|
|
void p9pdu_reset(struct p9_fcall *pdu)
|
|
{
|
|
pdu->offset = 0;
|
|
pdu->size = 0;
|
|
pdu->private = NULL;
|
|
pdu->pubuf = NULL;
|
|
pdu->pkbuf = NULL;
|
|
pdu->pbuf_size = 0;
|
|
}
|
|
|
|
int p9dirent_read(char *buf, int len, struct p9_dirent *dirent,
|
|
int proto_version)
|
|
{
|
|
struct p9_fcall fake_pdu;
|
|
int ret;
|
|
char *nameptr;
|
|
|
|
fake_pdu.size = len;
|
|
fake_pdu.capacity = len;
|
|
fake_pdu.sdata = buf;
|
|
fake_pdu.offset = 0;
|
|
|
|
ret = p9pdu_readf(&fake_pdu, proto_version, "Qqbs", &dirent->qid,
|
|
&dirent->d_off, &dirent->d_type, &nameptr);
|
|
if (ret) {
|
|
P9_DPRINTK(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret);
|
|
p9pdu_dump(1, &fake_pdu);
|
|
goto out;
|
|
}
|
|
|
|
strcpy(dirent->d_name, nameptr);
|
|
|
|
out:
|
|
return fake_pdu.offset;
|
|
}
|
|
EXPORT_SYMBOL(p9dirent_read);
|