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alistair23-linux/fs/cifs/cifs_debug.c
Jeff Layton bdf1b03e09 cifs: replace /proc/fs/cifs/Experimental with a module parm 
This flag currently only affects whether we allow "zero-copy" writes
with signing enabled. Typically we map pages in the pagecache directly
into the write request. If signing is enabled however and the contents
of the page change after the signature is calculated but before the
write is sent then the signature will be wrong. Servers typically
respond to this by closing down the socket.

Still, this can provide a performance benefit so the "Experimental" flag
was overloaded to allow this. That's really not a good place for this
option however since it's not clear what that flag does.

Move that flag instead to a new module parameter that better describes
its purpose. That's also better since it can be set at module insertion
time by configuring modprobe.d.

Reviewed-by: Suresh Jayaraman <sjayaraman@suse.de>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
2011-04-12 00:40:43 +00:00

783 lines
21 KiB
C
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/*
* fs/cifs_debug.c
*
* Copyright (C) International Business Machines Corp., 2000,2005
*
* Modified by Steve French (sfrench@us.ibm.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <asm/uaccess.h>
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"
void
cifs_dump_mem(char *label, void *data, int length)
{
int i, j;
int *intptr = data;
char *charptr = data;
char buf[10], line[80];
printk(KERN_DEBUG "%s: dump of %d bytes of data at 0x%p\n",
label, length, data);
for (i = 0; i < length; i += 16) {
line[0] = 0;
for (j = 0; (j < 4) && (i + j * 4 < length); j++) {
sprintf(buf, " %08x", intptr[i / 4 + j]);
strcat(line, buf);
}
buf[0] = ' ';
buf[2] = 0;
for (j = 0; (j < 16) && (i + j < length); j++) {
buf[1] = isprint(charptr[i + j]) ? charptr[i + j] : '.';
strcat(line, buf);
}
printk(KERN_DEBUG "%s\n", line);
}
}
#ifdef CONFIG_CIFS_DEBUG2
void cifs_dump_detail(struct smb_hdr *smb)
{
cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d",
smb->Command, smb->Status.CifsError,
smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
cERROR(1, "smb buf %p len %d", smb, smbCalcSize_LE(smb));
}
void cifs_dump_mids(struct TCP_Server_Info *server)
{
struct list_head *tmp;
struct mid_q_entry *mid_entry;
if (server == NULL)
return;
cERROR(1, "Dump pending requests:");
spin_lock(&GlobalMid_Lock);
list_for_each(tmp, &server->pending_mid_q) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
cERROR(1, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %d",
mid_entry->midState,
(int)mid_entry->command,
mid_entry->pid,
mid_entry->callback_data,
mid_entry->mid);
#ifdef CONFIG_CIFS_STATS2
cERROR(1, "IsLarge: %d buf: %p time rcv: %ld now: %ld",
mid_entry->largeBuf,
mid_entry->resp_buf,
mid_entry->when_received,
jiffies);
#endif /* STATS2 */
cERROR(1, "IsMult: %d IsEnd: %d", mid_entry->multiRsp,
mid_entry->multiEnd);
if (mid_entry->resp_buf) {
cifs_dump_detail(mid_entry->resp_buf);
cifs_dump_mem("existing buf: ",
mid_entry->resp_buf, 62);
}
}
spin_unlock(&GlobalMid_Lock);
}
#endif /* CONFIG_CIFS_DEBUG2 */
#ifdef CONFIG_PROC_FS
static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
{
struct list_head *tmp1, *tmp2, *tmp3;
struct mid_q_entry *mid_entry;
struct TCP_Server_Info *server;
struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
int i, j;
__u32 dev_type;
seq_puts(m,
"Display Internal CIFS Data Structures for Debugging\n"
"---------------------------------------------------\n");
seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
seq_printf(m, "Features:");
#ifdef CONFIG_CIFS_DFS_UPCALL
seq_printf(m, " dfs");
#endif
#ifdef CONFIG_CIFS_FSCACHE
seq_printf(m, " fscache");
#endif
#ifdef CONFIG_CIFS_WEAK_PW_HASH
seq_printf(m, " lanman");
#endif
#ifdef CONFIG_CIFS_POSIX
seq_printf(m, " posix");
#endif
#ifdef CONFIG_CIFS_UPCALL
seq_printf(m, " spnego");
#endif
#ifdef CONFIG_CIFS_XATTR
seq_printf(m, " xattr");
#endif
#ifdef CONFIG_CIFS_ACL
seq_printf(m, " acl");
#endif
seq_putc(m, '\n');
seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
seq_printf(m, "Servers:");
i = 0;
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
i++;
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifsSesInfo,
smb_ses_list);
if ((ses->serverDomain == NULL) ||
(ses->serverOS == NULL) ||
(ses->serverNOS == NULL)) {
seq_printf(m, "\n%d) entry for %s not fully "
"displayed\n\t", i, ses->serverName);
} else {
seq_printf(m,
"\n%d) Name: %s Domain: %s Uses: %d OS:"
" %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
" session status: %d\t",
i, ses->serverName, ses->serverDomain,
ses->ses_count, ses->serverOS, ses->serverNOS,
ses->capabilities, ses->status);
}
seq_printf(m, "TCP status: %d\n\tLocal Users To "
"Server: %d SecMode: 0x%x Req On Wire: %d",
server->tcpStatus, server->srv_count,
server->secMode,
atomic_read(&server->inFlight));
#ifdef CONFIG_CIFS_STATS2
seq_printf(m, " In Send: %d In MaxReq Wait: %d",
atomic_read(&server->inSend),
atomic_read(&server->num_waiters));
#endif
seq_puts(m, "\n\tShares:");
j = 0;
list_for_each(tmp3, &ses->tcon_list) {
tcon = list_entry(tmp3, struct cifsTconInfo,
tcon_list);
++j;
dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
tcon->treeName, tcon->tc_count);
if (tcon->nativeFileSystem) {
seq_printf(m, "Type: %s ",
tcon->nativeFileSystem);
}
seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
"\nPathComponentMax: %d Status: 0x%d",
le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
le32_to_cpu(tcon->fsAttrInfo.Attributes),
le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
tcon->tidStatus);
if (dev_type == FILE_DEVICE_DISK)
seq_puts(m, " type: DISK ");
else if (dev_type == FILE_DEVICE_CD_ROM)
seq_puts(m, " type: CDROM ");
else
seq_printf(m, " type: %d ", dev_type);
if (tcon->need_reconnect)
seq_puts(m, "\tDISCONNECTED ");
seq_putc(m, '\n');
}
seq_puts(m, "\n\tMIDs:\n");
spin_lock(&GlobalMid_Lock);
list_for_each(tmp3, &server->pending_mid_q) {
mid_entry = list_entry(tmp3, struct mid_q_entry,
qhead);
seq_printf(m, "\tState: %d com: %d pid:"
" %d cbdata: %p mid %d\n",
mid_entry->midState,
(int)mid_entry->command,
mid_entry->pid,
mid_entry->callback_data,
mid_entry->mid);
}
spin_unlock(&GlobalMid_Lock);
}
}
spin_unlock(&cifs_tcp_ses_lock);
seq_putc(m, '\n');
/* BB add code to dump additional info such as TCP session info now */
return 0;
}
static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_debug_data_proc_show, NULL);
}
static const struct file_operations cifs_debug_data_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_debug_data_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#ifdef CONFIG_CIFS_STATS
static ssize_t cifs_stats_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
struct list_head *tmp1, *tmp2, *tmp3;
struct TCP_Server_Info *server;
struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '1' || c == 'y' || c == 'Y' || c == '0') {
#ifdef CONFIG_CIFS_STATS2
atomic_set(&totBufAllocCount, 0);
atomic_set(&totSmBufAllocCount, 0);
#endif /* CONFIG_CIFS_STATS2 */
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifsSesInfo,
smb_ses_list);
list_for_each(tmp3, &ses->tcon_list) {
tcon = list_entry(tmp3,
struct cifsTconInfo,
tcon_list);
atomic_set(&tcon->num_smbs_sent, 0);
atomic_set(&tcon->num_writes, 0);
atomic_set(&tcon->num_reads, 0);
atomic_set(&tcon->num_oplock_brks, 0);
atomic_set(&tcon->num_opens, 0);
atomic_set(&tcon->num_posixopens, 0);
atomic_set(&tcon->num_posixmkdirs, 0);
atomic_set(&tcon->num_closes, 0);
atomic_set(&tcon->num_deletes, 0);
atomic_set(&tcon->num_mkdirs, 0);
atomic_set(&tcon->num_rmdirs, 0);
atomic_set(&tcon->num_renames, 0);
atomic_set(&tcon->num_t2renames, 0);
atomic_set(&tcon->num_ffirst, 0);
atomic_set(&tcon->num_fnext, 0);
atomic_set(&tcon->num_fclose, 0);
atomic_set(&tcon->num_hardlinks, 0);
atomic_set(&tcon->num_symlinks, 0);
atomic_set(&tcon->num_locks, 0);
}
}
}
spin_unlock(&cifs_tcp_ses_lock);
}
return count;
}
static int cifs_stats_proc_show(struct seq_file *m, void *v)
{
int i;
struct list_head *tmp1, *tmp2, *tmp3;
struct TCP_Server_Info *server;
struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
seq_printf(m,
"Resources in use\nCIFS Session: %d\n",
sesInfoAllocCount.counter);
seq_printf(m, "Share (unique mount targets): %d\n",
tconInfoAllocCount.counter);
seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
bufAllocCount.counter,
cifs_min_rcv + tcpSesAllocCount.counter);
seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
smBufAllocCount.counter, cifs_min_small);
#ifdef CONFIG_CIFS_STATS2
seq_printf(m, "Total Large %d Small %d Allocations\n",
atomic_read(&totBufAllocCount),
atomic_read(&totSmBufAllocCount));
#endif /* CONFIG_CIFS_STATS2 */
seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
seq_printf(m,
"\n%d session %d share reconnects\n",
tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
seq_printf(m,
"Total vfs operations: %d maximum at one time: %d\n",
GlobalCurrentXid, GlobalMaxActiveXid);
i = 0;
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp1, &cifs_tcp_ses_list) {
server = list_entry(tmp1, struct TCP_Server_Info,
tcp_ses_list);
list_for_each(tmp2, &server->smb_ses_list) {
ses = list_entry(tmp2, struct cifsSesInfo,
smb_ses_list);
list_for_each(tmp3, &ses->tcon_list) {
tcon = list_entry(tmp3,
struct cifsTconInfo,
tcon_list);
i++;
seq_printf(m, "\n%d) %s", i, tcon->treeName);
if (tcon->need_reconnect)
seq_puts(m, "\tDISCONNECTED ");
seq_printf(m, "\nSMBs: %d Oplock Breaks: %d",
atomic_read(&tcon->num_smbs_sent),
atomic_read(&tcon->num_oplock_brks));
seq_printf(m, "\nReads: %d Bytes: %lld",
atomic_read(&tcon->num_reads),
(long long)(tcon->bytes_read));
seq_printf(m, "\nWrites: %d Bytes: %lld",
atomic_read(&tcon->num_writes),
(long long)(tcon->bytes_written));
seq_printf(m, "\nFlushes: %d",
atomic_read(&tcon->num_flushes));
seq_printf(m, "\nLocks: %d HardLinks: %d "
"Symlinks: %d",
atomic_read(&tcon->num_locks),
atomic_read(&tcon->num_hardlinks),
atomic_read(&tcon->num_symlinks));
seq_printf(m, "\nOpens: %d Closes: %d "
"Deletes: %d",
atomic_read(&tcon->num_opens),
atomic_read(&tcon->num_closes),
atomic_read(&tcon->num_deletes));
seq_printf(m, "\nPosix Opens: %d "
"Posix Mkdirs: %d",
atomic_read(&tcon->num_posixopens),
atomic_read(&tcon->num_posixmkdirs));
seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
atomic_read(&tcon->num_mkdirs),
atomic_read(&tcon->num_rmdirs));
seq_printf(m, "\nRenames: %d T2 Renames %d",
atomic_read(&tcon->num_renames),
atomic_read(&tcon->num_t2renames));
seq_printf(m, "\nFindFirst: %d FNext %d "
"FClose %d",
atomic_read(&tcon->num_ffirst),
atomic_read(&tcon->num_fnext),
atomic_read(&tcon->num_fclose));
}
}
}
spin_unlock(&cifs_tcp_ses_lock);
seq_putc(m, '\n');
return 0;
}
static int cifs_stats_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_stats_proc_show, NULL);
}
static const struct file_operations cifs_stats_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_stats_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_stats_proc_write,
};
#endif /* STATS */
static struct proc_dir_entry *proc_fs_cifs;
static const struct file_operations cifsFYI_proc_fops;
static const struct file_operations cifs_oplock_proc_fops;
static const struct file_operations cifs_lookup_cache_proc_fops;
static const struct file_operations traceSMB_proc_fops;
static const struct file_operations cifs_multiuser_mount_proc_fops;
static const struct file_operations cifs_security_flags_proc_fops;
static const struct file_operations cifs_linux_ext_proc_fops;
void
cifs_proc_init(void)
{
proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
if (proc_fs_cifs == NULL)
return;
proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
#ifdef CONFIG_CIFS_STATS
proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
#endif /* STATS */
proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
proc_create("OplockEnabled", 0, proc_fs_cifs, &cifs_oplock_proc_fops);
proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
&cifs_linux_ext_proc_fops);
proc_create("MultiuserMount", 0, proc_fs_cifs,
&cifs_multiuser_mount_proc_fops);
proc_create("SecurityFlags", 0, proc_fs_cifs,
&cifs_security_flags_proc_fops);
proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
&cifs_lookup_cache_proc_fops);
}
void
cifs_proc_clean(void)
{
if (proc_fs_cifs == NULL)
return;
remove_proc_entry("DebugData", proc_fs_cifs);
remove_proc_entry("cifsFYI", proc_fs_cifs);
remove_proc_entry("traceSMB", proc_fs_cifs);
#ifdef CONFIG_CIFS_STATS
remove_proc_entry("Stats", proc_fs_cifs);
#endif
remove_proc_entry("MultiuserMount", proc_fs_cifs);
remove_proc_entry("OplockEnabled", proc_fs_cifs);
remove_proc_entry("SecurityFlags", proc_fs_cifs);
remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
remove_proc_entry("fs/cifs", NULL);
}
static int cifsFYI_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", cifsFYI);
return 0;
}
static int cifsFYI_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifsFYI_proc_show, NULL);
}
static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
cifsFYI = 0;
else if (c == '1' || c == 'y' || c == 'Y')
cifsFYI = 1;
else if ((c > '1') && (c <= '9'))
cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
return count;
}
static const struct file_operations cifsFYI_proc_fops = {
.owner = THIS_MODULE,
.open = cifsFYI_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifsFYI_proc_write,
};
static int cifs_oplock_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", oplockEnabled);
return 0;
}
static int cifs_oplock_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_oplock_proc_show, NULL);
}
static ssize_t cifs_oplock_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
oplockEnabled = 0;
else if (c == '1' || c == 'y' || c == 'Y')
oplockEnabled = 1;
return count;
}
static const struct file_operations cifs_oplock_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_oplock_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_oplock_proc_write,
};
static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", linuxExtEnabled);
return 0;
}
static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_linux_ext_proc_show, NULL);
}
static ssize_t cifs_linux_ext_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
linuxExtEnabled = 0;
else if (c == '1' || c == 'y' || c == 'Y')
linuxExtEnabled = 1;
return count;
}
static const struct file_operations cifs_linux_ext_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_linux_ext_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_linux_ext_proc_write,
};
static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", lookupCacheEnabled);
return 0;
}
static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_lookup_cache_proc_show, NULL);
}
static ssize_t cifs_lookup_cache_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
lookupCacheEnabled = 0;
else if (c == '1' || c == 'y' || c == 'Y')
lookupCacheEnabled = 1;
return count;
}
static const struct file_operations cifs_lookup_cache_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_lookup_cache_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_lookup_cache_proc_write,
};
static int traceSMB_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", traceSMB);
return 0;
}
static int traceSMB_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, traceSMB_proc_show, NULL);
}
static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
traceSMB = 0;
else if (c == '1' || c == 'y' || c == 'Y')
traceSMB = 1;
return count;
}
static const struct file_operations traceSMB_proc_fops = {
.owner = THIS_MODULE,
.open = traceSMB_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = traceSMB_proc_write,
};
static int cifs_multiuser_mount_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "%d\n", multiuser_mount);
return 0;
}
static int cifs_multiuser_mount_proc_open(struct inode *inode, struct file *fh)
{
return single_open(fh, cifs_multiuser_mount_proc_show, NULL);
}
static ssize_t cifs_multiuser_mount_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
char c;
int rc;
rc = get_user(c, buffer);
if (rc)
return rc;
if (c == '0' || c == 'n' || c == 'N')
multiuser_mount = 0;
else if (c == '1' || c == 'y' || c == 'Y')
multiuser_mount = 1;
return count;
}
static const struct file_operations cifs_multiuser_mount_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_multiuser_mount_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_multiuser_mount_proc_write,
};
static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "0x%x\n", global_secflags);
return 0;
}
static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, cifs_security_flags_proc_show, NULL);
}
static ssize_t cifs_security_flags_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *ppos)
{
unsigned int flags;
char flags_string[12];
char c;
if ((count < 1) || (count > 11))
return -EINVAL;
memset(flags_string, 0, 12);
if (copy_from_user(flags_string, buffer, count))
return -EFAULT;
if (count < 3) {
/* single char or single char followed by null */
c = flags_string[0];
if (c == '0' || c == 'n' || c == 'N') {
global_secflags = CIFSSEC_DEF; /* default */
return count;
} else if (c == '1' || c == 'y' || c == 'Y') {
global_secflags = CIFSSEC_MAX;
return count;
} else if (!isdigit(c)) {
cERROR(1, "invalid flag %c", c);
return -EINVAL;
}
}
/* else we have a number */
flags = simple_strtoul(flags_string, NULL, 0);
cFYI(1, "sec flags 0x%x", flags);
if (flags <= 0) {
cERROR(1, "invalid security flags %s", flags_string);
return -EINVAL;
}
if (flags & ~CIFSSEC_MASK) {
cERROR(1, "attempt to set unsupported security flags 0x%x",
flags & ~CIFSSEC_MASK);
return -EINVAL;
}
/* flags look ok - update the global security flags for cifs module */
global_secflags = flags;
if (global_secflags & CIFSSEC_MUST_SIGN) {
/* requiring signing implies signing is allowed */
global_secflags |= CIFSSEC_MAY_SIGN;
cFYI(1, "packet signing now required");
} else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
cFYI(1, "packet signing disabled");
}
/* BB should we turn on MAY flags for other MUST options? */
return count;
}
static const struct file_operations cifs_security_flags_proc_fops = {
.owner = THIS_MODULE,
.open = cifs_security_flags_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = cifs_security_flags_proc_write,
};
#else
inline void cifs_proc_init(void)
{
}
inline void cifs_proc_clean(void)
{
}
#endif /* PROC_FS */
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