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Subject[PATCH 1/3] proc: sysctl: rename proc_doutsstring to proc_do_uts_string
Date
From: Sam Vilain <sam.vilain@catalyst.net.nz>

'proc_doutsstring' is confusing; delimit the word with more underscores.
---
kernel/sysctl.c | 16 ++++++++--------
1 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 708cdcd..618a2f8 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -141,7 +141,7 @@ #endif

static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
ctl_table *, void **);
-static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
+static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);

static ctl_table root_table[];
@@ -244,7 +244,7 @@ static ctl_table kern_table[] = {
.data = init_uts_ns.name.sysname,
.maxlen = sizeof(init_uts_ns.name.sysname),
.mode = 0444,
- .proc_handler = &proc_doutsstring,
+ .proc_handler = &proc_do_uts_string,
.strategy = &sysctl_string,
},
{
@@ -253,7 +253,7 @@ static ctl_table kern_table[] = {
.data = init_uts_ns.name.release,
.maxlen = sizeof(init_uts_ns.name.release),
.mode = 0444,
- .proc_handler = &proc_doutsstring,
+ .proc_handler = &proc_do_uts_string,
.strategy = &sysctl_string,
},
{
@@ -262,7 +262,7 @@ static ctl_table kern_table[] = {
.data = init_uts_ns.name.version,
.maxlen = sizeof(init_uts_ns.name.version),
.mode = 0444,
- .proc_handler = &proc_doutsstring,
+ .proc_handler = &proc_do_uts_string,
.strategy = &sysctl_string,
},
{
@@ -271,7 +271,7 @@ static ctl_table kern_table[] = {
.data = init_uts_ns.name.nodename,
.maxlen = sizeof(init_uts_ns.name.nodename),
.mode = 0644,
- .proc_handler = &proc_doutsstring,
+ .proc_handler = &proc_do_uts_string,
.strategy = &sysctl_string,
},
{
@@ -280,7 +280,7 @@ static ctl_table kern_table[] = {
.data = init_uts_ns.name.domainname,
.maxlen = sizeof(init_uts_ns.name.domainname),
.mode = 0644,
- .proc_handler = &proc_doutsstring,
+ .proc_handler = &proc_do_uts_string,
.strategy = &sysctl_string,
},
{
@@ -1677,7 +1677,7 @@ int proc_dostring(ctl_table *table, int
* to observe. Should this be in kernel/sys.c ????
*/

-static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
+static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
int r;
@@ -2256,7 +2256,7 @@ int proc_dostring(ctl_table *table, int
return -ENOSYS;
}

-static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
+static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
return -ENOSYS;
From sam.vilain@catalyst.net.nz Tue May 23 13:23:01 2006
From: Sam Vilain <sam.vilain@catalyst.net.nz>
Subject: [PATCH 2/3] proc: sysctl: add _proc_do_string helper
Date: Tue, 23 May 2006 13:23:01 +1200
To: ebiederm@xmission.com (Eric W. Biederman)
Cc: linux-kernel@vger.kernel.org, "Serge E. Hallyn" <serue@us.ibm.com>, herbert@13thfloor.at, dev@sw.ru, devel@openvz.org, sam@vilain.net, xemul@sw.ru, Dave Hansen <haveblue@us.ibm.com>, Andrew Morton <akpm@osdl.org>, Cedric Le Goater <clg@fr.ibm.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>
Message-Id: <20060523012301.13531.31499.stgit@localhost.localdomain>
In-Reply-To: <20060523012300.13531.96685.stgit@localhost.localdomain>
References: <20060523012300.13531.96685.stgit@localhost.localdomain>

From: Sam Vilain <sam.vilain@catalyst.net.nz>

The logic in proc_do_string is worth re-using without passing in a
ctl_table structure (say, we want to calculate a pointer and pass that
in instead); pass in the two fields it uses from that structure
as explicit arguments.
---
kernel/sysctl.c | 65 ++++++++++++++++++++++++++++++-------------------------
1 files changed, 36 insertions(+), 29 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 618a2f8..cf053fc 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1605,32 +1605,14 @@ static ssize_t proc_writesys(struct file
return do_rw_proc(1, file, (char __user *) buf, count, ppos);
}

-/**
- * proc_dostring - read a string sysctl
- * @table: the sysctl table
- * @write: %TRUE if this is a write to the sysctl file
- * @filp: the file structure
- * @buffer: the user buffer
- * @lenp: the size of the user buffer
- * @ppos: file position
- *
- * Reads/writes a string from/to the user buffer. If the kernel
- * buffer provided is not large enough to hold the string, the
- * string is truncated. The copied string is %NULL-terminated.
- * If the string is being read by the user process, it is copied
- * and a newline '\n' is added. It is truncated if the buffer is
- * not large enough.
- *
- * Returns 0 on success.
- */
-int proc_dostring(ctl_table *table, int write, struct file *filp,
- void __user *buffer, size_t *lenp, loff_t *ppos)
+int _proc_do_string(void* data, int maxlen, int write, struct file *filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
{
size_t len;
char __user *p;
char c;

- if (!table->data || !table->maxlen || !*lenp ||
+ if (!data || !maxlen || !*lenp ||
(*ppos && !write)) {
*lenp = 0;
return 0;
@@ -1646,20 +1628,20 @@ int proc_dostring(ctl_table *table, int
break;
len++;
}
- if (len >= table->maxlen)
- len = table->maxlen-1;
- if(copy_from_user(table->data, buffer, len))
+ if (len >= maxlen)
+ len = maxlen-1;
+ if(copy_from_user(data, buffer, len))
return -EFAULT;
- ((char *) table->data)[len] = 0;
+ ((char *) data)[len] = 0;
*ppos += *lenp;
} else {
- len = strlen(table->data);
- if (len > table->maxlen)
- len = table->maxlen;
+ len = strlen(data);
+ if (len > maxlen)
+ len = maxlen;
if (len > *lenp)
len = *lenp;
if (len)
- if(copy_to_user(buffer, table->data, len))
+ if(copy_to_user(buffer, data, len))
return -EFAULT;
if (len < *lenp) {
if(put_user('\n', ((char __user *) buffer) + len))
@@ -1672,6 +1654,31 @@ int proc_dostring(ctl_table *table, int
return 0;
}

+/**
+ * proc_dostring - read a string sysctl
+ * @table: the sysctl table
+ * @write: %TRUE if this is a write to the sysctl file
+ * @filp: the file structure
+ * @buffer: the user buffer
+ * @lenp: the size of the user buffer
+ * @ppos: file position
+ *
+ * Reads/writes a string from/to the user buffer. If the kernel
+ * buffer provided is not large enough to hold the string, the
+ * string is truncated. The copied string is %NULL-terminated.
+ * If the string is being read by the user process, it is copied
+ * and a newline '\n' is added. It is truncated if the buffer is
+ * not large enough.
+ *
+ * Returns 0 on success.
+ */
+int proc_dostring(ctl_table *table, int write, struct file *filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ return _proc_do_string(table->data, table->maxlen, write, filp,
+ buffer, lenp, ppos);
+}
+
/*
* Special case of dostring for the UTS structure. This has locks
* to observe. Should this be in kernel/sys.c ????
From sam.vilain@catalyst.net.nz Tue May 23 13:23:01 2006
From: Sam Vilain <sam.vilain@catalyst.net.nz>
Subject: [PATCH 3/3] proc: make UTS-related sysctls utsns aware
Date: Tue, 23 May 2006 13:23:01 +1200
To: ebiederm@xmission.com (Eric W. Biederman)
Cc: linux-kernel@vger.kernel.org, "Serge E. Hallyn" <serue@us.ibm.com>, herbert@13thfloor.at, dev@sw.ru, devel@openvz.org, sam@vilain.net, xemul@sw.ru, Dave Hansen <haveblue@us.ibm.com>, Andrew Morton <akpm@osdl.org>, Cedric Le Goater <clg@fr.ibm.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>
Message-Id: <20060523012301.13531.12776.stgit@localhost.localdomain>
In-Reply-To: <20060523012300.13531.96685.stgit@localhost.localdomain>
References: <20060523012300.13531.96685.stgit@localhost.localdomain>

From: Sam Vilain <sam.vilain@catalyst.net.nz>

Add a new function proc_do_utsns_string, that derives the pointer
into the uts_namespace->name structure, currently based on the
filename of the dentry in /proc, and calls _proc_do_string()
---
RFC only - not tested yet. builds, though.
kernel/sysctl.c | 104 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 104 insertions(+), 0 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index cf053fc..37dc17f 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -141,8 +141,13 @@ #endif

static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
ctl_table *, void **);
+#ifndef CONFIG_UTS_NS
static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
+#else
+static int proc_do_utsns_string(ctl_table *table, int write, struct file *filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos);
+#endif

static ctl_table root_table[];
static struct ctl_table_header root_table_header =
@@ -238,6 +243,7 @@ #endif
};

static ctl_table kern_table[] = {
+#ifndef CONFIG_UTS_NS
{
.ctl_name = KERN_OSTYPE,
.procname = "ostype",
@@ -283,6 +289,54 @@ static ctl_table kern_table[] = {
.proc_handler = &proc_do_uts_string,
.strategy = &sysctl_string,
},
+#else /* !CONFIG_UTS_NS */
+ {
+ .ctl_name = KERN_OSTYPE,
+ .procname = "ostype",
+ .data = NULL,
+ /* could maybe use __NEW_UTS_LEN here? */
+ .maxlen = sizeof(current->nsproxy->uts_ns->name.sysname),
+ .mode = 0444,
+ .proc_handler = &proc_do_utsns_string,
+ .strategy = &sysctl_string,
+ },
+ {
+ .ctl_name = KERN_OSRELEASE,
+ .procname = "osrelease",
+ .data = NULL,
+ .maxlen = sizeof(current->nsproxy->uts_ns->name.release),
+ .mode = 0444,
+ .proc_handler = &proc_do_utsns_string,
+ .strategy = &sysctl_string,
+ },
+ {
+ .ctl_name = KERN_VERSION,
+ .procname = "version",
+ .data = NULL,
+ .maxlen = sizeof(current->nsproxy->uts_ns->name.version),
+ .mode = 0444,
+ .proc_handler = &proc_do_utsns_string,
+ .strategy = &sysctl_string,
+ },
+ {
+ .ctl_name = KERN_NODENAME,
+ .procname = "hostname",
+ .data = NULL,
+ .maxlen = sizeof(current->nsproxy->uts_ns->name.nodename),
+ .mode = 0644,
+ .proc_handler = &proc_do_utsns_string,
+ .strategy = &sysctl_string,
+ },
+ {
+ .ctl_name = KERN_DOMAINNAME,
+ .procname = "domainname",
+ .data = NULL,
+ .maxlen = sizeof(current->nsproxy->uts_ns->name.domainname),
+ .mode = 0644,
+ .proc_handler = &proc_do_utsns_string,
+ .strategy = &sysctl_string,
+ },
+#endif /* !CONFIG_UTS_NS */
{
.ctl_name = KERN_PANIC,
.procname = "panic",
@@ -1684,6 +1738,7 @@ int proc_dostring(ctl_table *table, int
* to observe. Should this be in kernel/sys.c ????
*/

+#ifndef CONFIG_UTS_NS
static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -1700,6 +1755,55 @@ static int proc_do_uts_string(ctl_table
}
return r;
}
+#else /* !CONFIG_UTS_NS */
+static int proc_do_utsns_string(ctl_table *table, int write, struct file *filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ int r;
+ struct uts_namespace* uts_ns = current->nsproxy->uts_ns;
+ char* which;
+
+ /* map the filename to the pointer. perhaps it would be better
+ to put struct offset pointers in table->data ? */
+ switch (filp->f_dentry->d_name.name[3]) {
+ case 'y': /* ostYpe */
+ which = uts_ns->name.sysname;
+ break;
+ case 't': /* hosTname */
+ which = uts_ns->name.nodename;
+ break;
+ case 'e': /* osrElease */
+ which = uts_ns->name.release;
+ break;
+ case 's': /* verSion */
+ which = uts_ns->name.version;
+ break;
+ case 'x': /* XXX - unreachable */
+ which = uts_ns->name.machine;
+ break;
+ case 'a': /* domAinname */
+ which = uts_ns->name.domainname;
+ break;
+ default:
+ printk("procfs: impossible uts part '%s'",
+ (char*)filp->f_dentry->d_name.name);
+ r = -EINVAL;
+ goto out;
+ }
+
+ if (!write) {
+ down_read(&uts_sem);
+ r=_proc_do_string(which,table->maxlen,0,filp,buffer,lenp, ppos);
+ up_read(&uts_sem);
+ } else {
+ down_write(&uts_sem);
+ r=_proc_do_string(which,table->maxlen,1,filp,buffer,lenp, ppos);
+ up_write(&uts_sem);
+ }
+ out:
+ return r;
+}
+#endif /* !CONFIG_UTS_NS */

static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
int *valp,
-
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