[patch -v3 00/22] use simple_read_from_buffer and memory_read_from_buffer

[patch -v3 00/22] use simple_read_from_buffer and memory_read_from_buffer

[Akinobu Mita]

Changes since -v2:
- drop sunrpc patch because of a preference for seq_printf() conversion
- fix available buffer size in vmcp patch
- add Acked-by: from maintainers

This series of patches is almost trivial replacement except for
introducing memory_read_from_buffer().

The only difference between memory_read_from_buffer() and
simple_read_from_buffer() is which address space the function copies to.

simple_read_from_buffer() copies to user space memory.
memory_read_from_buffer() copies to normal memory.

[patch -v3 01/22] binfmt_misc: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: binfmt-misc-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1220 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
 fs/binfmt_misc.c |   20 +++-----------------
 1 file changed, 3 insertions(+), 17 deletions(-)

Index: 2.6-git/fs/binfmt_misc.c
===================================================================
--- 2.6-git.orig/fs/binfmt_misc.c
+++ 2.6-git/fs/binfmt_misc.c
@@ -27,6 +27,7 @@
 #include <linux/namei.h>
 #include <linux/mount.h>
 #include <linux/syscalls.h>
+#include <linux/fs.h>
 
 #include <asm/uaccess.h>
 
@@ -535,31 +536,16 @@ static ssize_t
 bm_entry_read(struct file * file, char __user * buf, size_t nbytes, loff_t *ppos)
 {
 	Node *e = file->f_path.dentry->d_inode->i_private;
-	loff_t pos = *ppos;
 	ssize_t res;
 	char *page;
-	int len;
 
 	if (!(page = (char*) __get_free_page(GFP_KERNEL)))
 		return -ENOMEM;
 
 	entry_status(e, page);
-	len = strlen(page);
 
-	res = -EINVAL;
-	if (pos < 0)
-		goto out;
-	res = 0;
-	if (pos >= len)
-		goto out;
-	if (len < pos + nbytes)
-		nbytes = len - pos;
-	res = -EFAULT;
-	if (copy_to_user(buf, page + pos, nbytes))
-		goto out;
-	*ppos = pos + nbytes;
-	res = nbytes;
-out:
+	res = simple_read_from_buffer(buf, nbytes, ppos, page, strlen(page));
+
 	free_page((unsigned long) page);
 	return res;
 }

-- 

[patch -v3 02/22] ocfs2: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: ocfs2-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1323 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <joel.becker@oracle.com>
Cc: ocfs2-devel@oss.oracle.com 
---
 fs/ocfs2/stack_user.c |   19 +++++--------------
 1 file changed, 5 insertions(+), 14 deletions(-)

Index: 2.6-git/fs/ocfs2/stack_user.c
===================================================================
--- 2.6-git.orig/fs/ocfs2/stack_user.c
+++ 2.6-git/fs/ocfs2/stack_user.c
@@ -549,26 +549,17 @@ static ssize_t ocfs2_control_read(struct
 				  size_t count,
 				  loff_t *ppos)
 {
-	char *proto_string = OCFS2_CONTROL_PROTO;
-	size_t to_write = 0;
+	ssize_t ret;
 
-	if (*ppos >= OCFS2_CONTROL_PROTO_LEN)
-		return 0;
-
-	to_write = OCFS2_CONTROL_PROTO_LEN - *ppos;
-	if (to_write > count)
-		to_write = count;
-	if (copy_to_user(buf, proto_string + *ppos, to_write))
-		return -EFAULT;
-
-	*ppos += to_write;
+	ret = simple_read_from_buffer(buf, count, ppos,
+			OCFS2_CONTROL_PROTO, OCFS2_CONTROL_PROTO_LEN);
 
 	/* Have we read the whole protocol list? */
-	if (*ppos >= OCFS2_CONTROL_PROTO_LEN)
+	if (ret > 0 && *ppos >= OCFS2_CONTROL_PROTO_LEN)
 		ocfs2_control_set_handshake_state(file,
 						  OCFS2_CONTROL_HANDSHAKE_READ);
 
-	return to_write;
+	return ret;
 }
 
 static int ocfs2_control_release(struct inode *inode, struct file *file)

-- 

[patch -v3 03/22] ipc: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: mqueue-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1516 bytes --]

Also this patch kills unneccesary trailing NULL character.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
 ipc/mqueue.c |   25 +++++++------------------
 1 file changed, 7 insertions(+), 18 deletions(-)

Index: 2.6-git/ipc/mqueue.c
===================================================================
--- 2.6-git.orig/ipc/mqueue.c
+++ 2.6-git/ipc/mqueue.c
@@ -314,15 +314,11 @@ static int mqueue_unlink(struct inode *d
 *	through std routines)
 */
 static ssize_t mqueue_read_file(struct file *filp, char __user *u_data,
-				size_t count, loff_t * off)
+				size_t count, loff_t *off)
 {
 	struct mqueue_inode_info *info = MQUEUE_I(filp->f_path.dentry->d_inode);
 	char buffer[FILENT_SIZE];
-	size_t slen;
-	loff_t o;
-
-	if (!count)
-		return 0;
+	ssize_t ret;
 
 	spin_lock(&info->lock);
 	snprintf(buffer, sizeof(buffer),
@@ -335,21 +331,14 @@ static ssize_t mqueue_read_file(struct f
 			pid_vnr(info->notify_owner));
 	spin_unlock(&info->lock);
 	buffer[sizeof(buffer)-1] = '\0';
-	slen = strlen(buffer)+1;
-
-	o = *off;
-	if (o > slen)
-		return 0;
-
-	if (o + count > slen)
-		count = slen - o;
 
-	if (copy_to_user(u_data, buffer + o, count))
-		return -EFAULT;
+	ret = simple_read_from_buffer(u_data, count, off, buffer,
+				strlen(buffer));
+	if (ret <= 0)
+		return ret;
 
-	*off = o + count;
 	filp->f_path.dentry->d_inode->i_atime = filp->f_path.dentry->d_inode->i_ctime = CURRENT_TIME;
-	return count;
+	return ret;
 }
 
 static int mqueue_flush_file(struct file *filp, fl_owner_t id)

-- 

[patch -v3 04/22] isdn: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: isdn-hysdn-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1671 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Karsten Keil <kkeil@suse.de>
---
 drivers/isdn/hysdn/hysdn_procconf.c |   27 +++++++--------------------
 1 file changed, 7 insertions(+), 20 deletions(-)

Index: 2.6-git/drivers/isdn/hysdn/hysdn_procconf.c
===================================================================
--- 2.6-git.orig/drivers/isdn/hysdn/hysdn_procconf.c
+++ 2.6-git/drivers/isdn/hysdn/hysdn_procconf.c
@@ -207,30 +207,17 @@ hysdn_conf_write(struct file *file, cons
 /* read conf file -> output card info data */
 /*******************************************/
 static ssize_t
-hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t * off)
+hysdn_conf_read(struct file *file, char __user *buf, size_t count, loff_t *off)
 {
 	char *cp;
-	int i;
 
-	if (file->f_mode & FMODE_READ) {
-		if (!(cp = file->private_data))
-			return (-EFAULT);	/* should never happen */
-		i = strlen(cp);	/* get total string length */
-		if (*off < i) {
-			/* still bytes to transfer */
-			cp += *off;	/* point to desired data offset */
-			i -= *off;	/* remaining length */
-			if (i > count)
-				i = count;	/* limit length to transfer */
-			if (copy_to_user(buf, cp, i))
-				return (-EFAULT);	/* copy error */
-			*off += i;	/* adjust offset */
-		} else
-			return (0);
-	} else
-		return (-EPERM);	/* no permission to read */
+	if (!(file->f_mode & FMODE_READ))
+		return -EPERM;	/* no permission to read */
 
-	return (i);
+	if (!(cp = file->private_data))
+		return -EFAULT;	/* should never happen */
+
+	return simple_read_from_buffer(buf, count, off, cp, strlen(cp));
 }				/* hysdn_conf_read */
 
 /******************/

-- 

[patch -v3 05/22] s390/vmcp: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: s390-vmcp-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1619 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux390@de.ibm.com
Cc: linux-s390@vger.kernel.org
---
 drivers/s390/char/vmcp.c |   22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

Index: 2.6-git/drivers/s390/char/vmcp.c
===================================================================
--- 2.6-git.orig/drivers/s390/char/vmcp.c
+++ 2.6-git/drivers/s390/char/vmcp.c
@@ -61,30 +61,24 @@ static int vmcp_release(struct inode *in
 static ssize_t
 vmcp_read(struct file *file, char __user *buff, size_t count, loff_t *ppos)
 {
-	size_t tocopy;
+	ssize_t ret;
+	size_t size;
 	struct vmcp_session *session;
 
-	session = (struct vmcp_session *)file->private_data;
+	session = file->private_data;
 	if (mutex_lock_interruptible(&session->mutex))
 		return -ERESTARTSYS;
 	if (!session->response) {
 		mutex_unlock(&session->mutex);
 		return 0;
 	}
-	if (*ppos > session->resp_size) {
-		mutex_unlock(&session->mutex);
-		return 0;
-	}
-	tocopy = min(session->resp_size - (size_t) (*ppos), count);
-	tocopy = min(tocopy, session->bufsize - (size_t) (*ppos));
+	size = min_t(size_t, session->resp_size, session->bufsize);
+	ret = simple_read_from_buffer(buff, count, ppos,
+					session->response, size);
 
-	if (copy_to_user(buff, session->response + (*ppos), tocopy)) {
-		mutex_unlock(&session->mutex);
-		return -EFAULT;
-	}
 	mutex_unlock(&session->mutex);
-	*ppos += tocopy;
-	return tocopy;
+
+	return ret;
 }
 
 static ssize_t

-- 

[patch -v3 06/22] s390: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: hypfs-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1487 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux390@de.ibm.com
Cc: linux-s390@vger.kernel.org
---
 arch/s390/hypfs/inode.c |   29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

Index: 2.6-git/arch/s390/hypfs/inode.c
===================================================================
--- 2.6-git.orig/arch/s390/hypfs/inode.c
+++ 2.6-git/arch/s390/hypfs/inode.c
@@ -150,33 +150,24 @@ static ssize_t hypfs_aio_read(struct kio
 			      unsigned long nr_segs, loff_t offset)
 {
 	char *data;
-	size_t len;
+	ssize_t ret;
 	struct file *filp = iocb->ki_filp;
 	/* XXX: temporary */
 	char __user *buf = iov[0].iov_base;
 	size_t count = iov[0].iov_len;
 
-	if (nr_segs != 1) {
-		count = -EINVAL;
-		goto out;
-	}
+	if (nr_segs != 1)
+		return -EINVAL;
 
 	data = filp->private_data;
-	len = strlen(data);
-	if (offset > len) {
-		count = 0;
-		goto out;
-	}
-	if (count > len - offset)
-		count = len - offset;
-	if (copy_to_user(buf, data + offset, count)) {
-		count = -EFAULT;
-		goto out;
-	}
-	iocb->ki_pos += count;
+	ret = simple_read_from_buffer(buf, count, &offset, data, strlen(data));
+	if (ret <= 0)
+		return ret;
+
+	iocb->ki_pos += ret;
 	file_accessed(filp);
-out:
-	return count;
+
+	return ret;
 }
 static ssize_t hypfs_aio_write(struct kiocb *iocb, const struct iovec *iov,
 			      unsigned long nr_segs, loff_t offset)

-- 

[patch -v3 07/22] nwflash: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: nwflash-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1486 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Russell King <linux@arm.linux.org.uk>
---
 drivers/char/nwflash.c |   31 ++++++++-----------------------
 1 file changed, 8 insertions(+), 23 deletions(-)

Index: 2.6-git/drivers/char/nwflash.c
===================================================================
--- 2.6-git.orig/drivers/char/nwflash.c
+++ 2.6-git/drivers/char/nwflash.c
@@ -122,35 +122,20 @@ static int flash_ioctl(struct inode *ino
 static ssize_t flash_read(struct file *file, char __user *buf, size_t size,
 			  loff_t *ppos)
 {
-	unsigned long p = *ppos;
-	unsigned int count = size;
-	int ret = 0;
+	ssize_t ret;
 
 	if (flashdebug)
 		printk(KERN_DEBUG "flash_read: flash_read: offset=0x%lX, "
 		       "buffer=%p, count=0x%X.\n", p, buf, count);
+	/*
+	 * We now lock against reads and writes. --rmk
+	 */
+	if (mutex_lock_interruptible(&nwflash_mutex))
+		return -ERESTARTSYS;
 
-	if (count)
-		ret = -ENXIO;
+	ret = simple_read_from_buffer(buf, size, ppos, FLASH_BASE, gbFlashSize);
+	mutex_unlock(&nwflash_mutex);
 
-	if (p < gbFlashSize) {
-		if (count > gbFlashSize - p)
-			count = gbFlashSize - p;
-
-		/*
-		 * We now lock against reads and writes. --rmk
-		 */
-		if (mutex_lock_interruptible(&nwflash_mutex))
-			return -ERESTARTSYS;
-
-		ret = copy_to_user(buf, (void *)(FLASH_BASE + p), count);
-		if (ret == 0) {
-			ret = count;
-			*ppos += count;
-		} else
-			ret = -EFAULT;
-		mutex_unlock(&nwflash_mutex);
-	}
 	return ret;
 }
 

-- 

[patch -v3 08/22] usbmon: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: mon-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1090 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Greg Kroah-Hartman <greg@kroah.com>
---
 drivers/usb/mon/mon_stat.c |   14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

Index: 2.6-git/drivers/usb/mon/mon_stat.c
===================================================================
--- 2.6-git.orig/drivers/usb/mon/mon_stat.c
+++ 2.6-git/drivers/usb/mon/mon_stat.c
@@ -9,6 +9,7 @@
 
 #include <linux/kernel.h>
 #include <linux/usb.h>
+#include <linux/fs.h>
 #include <asm/uaccess.h>
 
 #include "usb_mon.h"
@@ -42,19 +43,8 @@ static ssize_t mon_stat_read(struct file
 				size_t nbytes, loff_t *ppos)
 {
 	struct snap *sp = file->private_data;
-	loff_t pos = *ppos;
-	int cnt;
 
-	if (pos < 0 || pos >= sp->slen)
-		return 0;
-	if (nbytes == 0)
-		return 0;
-	if ((cnt = sp->slen - pos) > nbytes)
-		cnt = nbytes;
-	if (copy_to_user(buf, sp->str + pos, cnt))
-		return -EFAULT;
-	*ppos = pos + cnt;
-	return cnt;
+	return simple_read_from_buffer(buf, nbytes, ppos, sp->str, sp->slen);
 }
 
 static int mon_stat_release(struct inode *inode, struct file *file)

-- 

[patch -v3 09/22] ttusb: use simple_read_from_buffer()

[Akinobu Mita]

[-- Attachment #1: ttusb-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1191 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: v4l-dvb-maintainer@linuxtv.org
---
 drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c |   18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

Index: 2.6-git/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c
===================================================================
--- 2.6-git.orig/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c
+++ 2.6-git/drivers/media/dvb/ttusb-budget/dvb-ttusb-budget.c
@@ -19,6 +19,7 @@
 #include <linux/errno.h>
 #include <linux/jiffies.h>
 #include <linux/mutex.h>
+#include <linux/fs.h>
 
 #include "dvb_frontend.h"
 #include "dmxdev.h"
@@ -983,22 +984,9 @@ static int stc_open(struct inode *inode,
 }
 
 static ssize_t stc_read(struct file *file, char *buf, size_t count,
-		 loff_t * offset)
+		 loff_t *offset)
 {
-	int tc = count;
-
-	if ((tc + *offset) > 8192)
-		tc = 8192 - *offset;
-
-	if (tc < 0)
-		return 0;
-
-	if (copy_to_user(buf, stc_firmware + *offset, tc))
-		return -EFAULT;
-
-	*offset += tc;
-
-	return tc;
+	return simple_read_from_buffer(buf, count, offset, stc_firmware, 8192);
 }
 
 static int stc_release(struct inode *inode, struct file *file)

-- 

[patch -v3 10/22] airo: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: airo-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1108 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: netdev@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
---
 drivers/net/wireless/airo.c |   15 +++------------
 1 file changed, 3 insertions(+), 12 deletions(-)

Index: 2.6-git/drivers/net/wireless/airo.c
===================================================================
--- 2.6-git.orig/drivers/net/wireless/airo.c
+++ 2.6-git/drivers/net/wireless/airo.c
@@ -4560,22 +4560,13 @@ static ssize_t proc_read( struct file *f
 			  size_t len,
 			  loff_t *offset )
 {
-	loff_t pos = *offset;
-	struct proc_data *priv = (struct proc_data*)file->private_data;
+	struct proc_data *priv = file->private_data;
 
 	if (!priv->rbuffer)
 		return -EINVAL;
 
-	if (pos < 0)
-		return -EINVAL;
-	if (pos >= priv->readlen)
-		return 0;
-	if (len > priv->readlen - pos)
-		len = priv->readlen - pos;
-	if (copy_to_user(buffer, priv->rbuffer + pos, len))
-		return -EFAULT;
-	*offset = pos + len;
-	return len;
+	return simple_read_from_buffer(buffer, len, offset, priv->rbuffer,
+					priv->readlen);
 }
 
 /*

-- 

[patch -v3 11/22] cris: use simple_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: cris-profile-use-simple-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1065 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: dev-etrax@axis.com
---
 arch/cris/kernel/profile.c |   17 +++++++----------
 1 file changed, 7 insertions(+), 10 deletions(-)

Index: 2.6-git/arch/cris/kernel/profile.c
===================================================================
--- 2.6-git.orig/arch/cris/kernel/profile.c
+++ 2.6-git/arch/cris/kernel/profile.c
@@ -35,19 +35,16 @@ read_cris_profile(struct file *file, cha
 		  size_t count, loff_t *ppos)
 {
 	unsigned long p = *ppos;
+	ssize_t ret;
 
-	if (p > SAMPLE_BUFFER_SIZE)
-		return 0;
+	ret = simple_read_from_buffer(buf, count, ppos, sample_buffer,
+						SAMPLE_BUFFER_SIZE);
+	if (ret < 0)
+		return ret;
 
-	if (p + count > SAMPLE_BUFFER_SIZE)
-		count = SAMPLE_BUFFER_SIZE - p;
-	if (copy_to_user(buf, sample_buffer + p,count))
-		return -EFAULT;
+	memset(sample_buffer + p, 0, ret);
 
-	memset(sample_buffer + p, 0, count);
-	*ppos += count;
-
-	return count;
+	return ret;
 }
 
 static ssize_t

-- 

[patch -v3 12/22] introduce memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 2295 bytes --]

This patch introduces memory_read_from_buffer.

The only difference between memory_read_from_buffer and simple_read_from_buffer
is which address space the function copies to.

simple_read_from_buffer copies to user space memory.
memory_read_from_buffer copies to normal memory.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
---
 fs/libfs.c         |   18 ++++++++++++++++++
 include/linux/fs.h |    5 ++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

Index: 2.6-git/fs/libfs.c
===================================================================
--- 2.6-git.orig/fs/libfs.c
+++ 2.6-git/fs/libfs.c
@@ -528,6 +528,23 @@ ssize_t simple_read_from_buffer(void __u
 	return count;
 }
 
+ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
+				const void *from, size_t available)
+{
+	loff_t pos = *ppos;
+
+	if (pos < 0)
+		return -EINVAL;
+	if (pos >= available)
+		return 0;
+	if (count > available - pos)
+		count = available - pos;
+	memcpy(to, from + pos, count);
+	*ppos = pos + count;
+
+	return count;
+}
+
 /*
  * Transaction based IO.
  * The file expects a single write which triggers the transaction, and then
@@ -800,6 +817,7 @@ EXPORT_SYMBOL(simple_statfs);
 EXPORT_SYMBOL(simple_sync_file);
 EXPORT_SYMBOL(simple_unlink);
 EXPORT_SYMBOL(simple_read_from_buffer);
+EXPORT_SYMBOL(memory_read_from_buffer);
 EXPORT_SYMBOL(simple_transaction_get);
 EXPORT_SYMBOL(simple_transaction_read);
 EXPORT_SYMBOL(simple_transaction_release);
Index: 2.6-git/include/linux/fs.h
===================================================================
--- 2.6-git.orig/include/linux/fs.h
+++ 2.6-git/include/linux/fs.h
@@ -2000,7 +2000,10 @@ extern int simple_fill_super(struct supe
 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
 extern void simple_release_fs(struct vfsmount **mount, int *count);
 
-extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
+extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
+			loff_t *ppos, const void *from, size_t available);
+extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
+			const void *from, size_t available);
 
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,

-- 

[patch -v3 13/22] dcdbas: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: dcdbas-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1101 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Doug Warzecha <Douglas_Warzecha@dell.com>
---
 drivers/firmware/dcdbas.c |   14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

Index: 2.6-git/drivers/firmware/dcdbas.c
===================================================================
--- 2.6-git.orig/drivers/firmware/dcdbas.c
+++ 2.6-git/drivers/firmware/dcdbas.c
@@ -34,6 +34,7 @@
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/mutex.h>
+#include <linux/fs.h>
 #include <asm/io.h>
 
 #include "dcdbas.h"
@@ -152,20 +153,11 @@ static ssize_t smi_data_read(struct kobj
 			     struct bin_attribute *bin_attr,
 			     char *buf, loff_t pos, size_t count)
 {
-	size_t max_read;
 	ssize_t ret;
 
 	mutex_lock(&smi_data_lock);
-
-	if (pos >= smi_data_buf_size) {
-		ret = 0;
-		goto out;
-	}
-
-	max_read = smi_data_buf_size - pos;
-	ret = min(max_read, count);
-	memcpy(buf, smi_data_buf + pos, ret);
-out:
+	ret = memory_read_from_buffer(buf, count, &pos, smi_data_buf,
+					smi_data_buf_size);
 	mutex_unlock(&smi_data_lock);
 	return ret;
 }

-- 

[patch -v3 14/22] dell_rbu: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: dell_rbu-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1930 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Abhay Salunke <abhay_salunke@dell.com>
---
 drivers/firmware/dell_rbu.c |   29 ++++-------------------------
 1 file changed, 4 insertions(+), 25 deletions(-)

Index: 2.6-git/drivers/firmware/dell_rbu.c
===================================================================
--- 2.6-git.orig/drivers/firmware/dell_rbu.c
+++ 2.6-git/drivers/firmware/dell_rbu.c
@@ -44,6 +44,7 @@
 #include <linux/moduleparam.h>
 #include <linux/firmware.h>
 #include <linux/dma-mapping.h>
+#include <linux/fs.h>
 
 MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
 MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
@@ -507,11 +508,6 @@ static ssize_t read_packet_data(char *bu
 
 static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
 {
-	unsigned char *ptemp = NULL;
-	size_t bytes_left = 0;
-	size_t data_length = 0;
-	ssize_t ret_count = 0;
-
 	/* check to see if we have something to return */
 	if ((rbu_data.image_update_buffer == NULL) ||
 		(rbu_data.bios_image_size == 0)) {
@@ -519,28 +515,11 @@ static ssize_t read_rbu_mono_data(char *
 			"bios_image_size %lu\n",
 			rbu_data.image_update_buffer,
 			rbu_data.bios_image_size);
-		ret_count = -ENOMEM;
-		goto read_rbu_data_exit;
-	}
-
-	if (pos > rbu_data.bios_image_size) {
-		ret_count = 0;
-		goto read_rbu_data_exit;
+		return -ENOMEM;
 	}
 
-	bytes_left = rbu_data.bios_image_size - pos;
-	data_length = min(bytes_left, count);
-
-	ptemp = rbu_data.image_update_buffer;
-	memcpy(buffer, (ptemp + pos), data_length);
-
-	if ((pos + count) > rbu_data.bios_image_size)
-		/* this was the last copy */
-		ret_count = bytes_left;
-	else
-		ret_count = count;
-      read_rbu_data_exit:
-	return ret_count;
+	return memory_read_from_buffer(buffer, count, &pos,
+			rbu_data.image_update_buffer, rbu_data.bios_image_size);
 }
 
 static ssize_t read_rbu_data(struct kobject *kobj,

-- 

[patch -v3 15/22] firmware: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: firmware-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1279 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Greg Kroah-Hartman <greg@kroah.com>
---
 drivers/base/firmware_class.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

Index: 2.6-git/drivers/base/firmware_class.c
===================================================================
--- 2.6-git.orig/drivers/base/firmware_class.c
+++ 2.6-git/drivers/base/firmware_class.c
@@ -17,6 +17,7 @@
 #include <linux/bitops.h>
 #include <linux/mutex.h>
 #include <linux/kthread.h>
+#include <linux/fs.h>
 
 #include <linux/firmware.h>
 #include "base.h"
@@ -176,7 +177,7 @@ firmware_data_read(struct kobject *kobj,
 	struct device *dev = to_dev(kobj);
 	struct firmware_priv *fw_priv = dev_get_drvdata(dev);
 	struct firmware *fw;
-	ssize_t ret_count = count;
+	ssize_t ret_count;
 
 	mutex_lock(&fw_lock);
 	fw = fw_priv->fw;
@@ -184,14 +185,8 @@ firmware_data_read(struct kobject *kobj,
 		ret_count = -ENODEV;
 		goto out;
 	}
-	if (offset > fw->size) {
-		ret_count = 0;
-		goto out;
-	}
-	if (offset + ret_count > fw->size)
-		ret_count = fw->size - offset;
-
-	memcpy(buffer, fw->data + offset, ret_count);
+	ret_count = memory_read_from_buffer(buffer, count, &offset,
+						fw->data, fw->size);
 out:
 	mutex_unlock(&fw_lock);
 	return ret_count;

-- 

[patch -v3 16/22] acpi: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: acpi-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1245 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Len Brown <len.brown@intel.com>
Cc: linux-acpi@vger.kernel.org
---
 drivers/acpi/system.c |   15 ++-------------
 1 file changed, 2 insertions(+), 13 deletions(-)

Index: 2.6-git/drivers/acpi/system.c
===================================================================
--- 2.6-git.orig/drivers/acpi/system.c
+++ 2.6-git/drivers/acpi/system.c
@@ -77,7 +77,6 @@ static ssize_t acpi_table_show(struct ko
 	    container_of(bin_attr, struct acpi_table_attr, attr);
 	struct acpi_table_header *table_header = NULL;
 	acpi_status status;
-	ssize_t ret_count = count;
 
 	status =
 	    acpi_get_table(table_attr->name, table_attr->instance,
@@ -85,18 +84,8 @@ static ssize_t acpi_table_show(struct ko
 	if (ACPI_FAILURE(status))
 		return -ENODEV;
 
-	if (offset >= table_header->length) {
-		ret_count = 0;
-		goto end;
-	}
-
-	if (offset + ret_count > table_header->length)
-		ret_count = table_header->length - offset;
-
-	memcpy(buf, ((char *)table_header) + offset, ret_count);
-
-      end:
-	return ret_count;
+	return memory_read_from_buffer(buf, count, &offset,
+					table_header, table_header->length);
 }
 
 static void acpi_table_attr_init(struct acpi_table_attr *table_attr,

-- 

[patch -v3 17/22] aty: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: aty-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1035 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux-fbdev-devel@lists.sourceforge.net
---
 drivers/video/aty/radeon_base.c |   11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

Index: 2.6-git/drivers/video/aty/radeon_base.c
===================================================================
--- 2.6-git.orig/drivers/video/aty/radeon_base.c
+++ 2.6-git/drivers/video/aty/radeon_base.c
@@ -70,6 +70,7 @@
 #include <linux/pci.h>
 #include <linux/vmalloc.h>
 #include <linux/device.h>
+#include <linux/fs.h>
 
 #include <asm/io.h>
 #include <linux/uaccess.h>
@@ -2098,15 +2099,7 @@ static void radeon_identify_vram(struct 
 
 static ssize_t radeon_show_one_edid(char *buf, loff_t off, size_t count, const u8 *edid)
 {
-	if (off > EDID_LENGTH)
-		return 0;
-
-	if (off + count > EDID_LENGTH)
-		count = EDID_LENGTH - off;
-
-	memcpy(buf, edid + off, count);
-
-	return count;
+	return memory_read_from_buffer(buf, count, &off, edid, EDID_LENGTH);
 }
 
 

-- 

[patch -v3 18/22] zorro: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: zorro-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1232 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
---
 drivers/zorro/zorro-sysfs.c |   10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

Index: 2.6-git/drivers/zorro/zorro-sysfs.c
===================================================================
--- 2.6-git.orig/drivers/zorro/zorro-sysfs.c
+++ 2.6-git/drivers/zorro/zorro-sysfs.c
@@ -15,6 +15,7 @@
 #include <linux/zorro.h>
 #include <linux/stat.h>
 #include <linux/string.h>
+#include <linux/fs.h>
 
 #include "zorro.h"
 
@@ -56,12 +57,6 @@ static ssize_t zorro_read_config(struct 
 	struct zorro_dev *z = to_zorro_dev(container_of(kobj, struct device,
 					   kobj));
 	struct ConfigDev cd;
-	unsigned int size = sizeof(cd);
-
-	if (off > size)
-		return 0;
-	if (off+count > size)
-		count = size-off;
 
 	/* Construct a ConfigDev */
 	memset(&cd, 0, sizeof(cd));
@@ -71,8 +66,7 @@ static ssize_t zorro_read_config(struct 
 	cd.cd_BoardAddr = (void *)zorro_resource_start(z);
 	cd.cd_BoardSize = zorro_resource_len(z);
 
-	memcpy(buf, (void *)&cd+off, count);
-	return count;
+	return memory_read_from_buffer(buf, count, &off, &cd, sizeof(cd));
 }
 
 static struct bin_attribute zorro_config_attr = {

-- 

[patch -v3 19/22] s390/cio: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: cio-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1259 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux390@de.ibm.com
Cc: linux-s390@vger.kernel.org
---
 drivers/s390/cio/chp.c |   12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

Index: 2.6-git/drivers/s390/cio/chp.c
===================================================================
--- 2.6-git.orig/drivers/s390/cio/chp.c
+++ 2.6-git/drivers/s390/cio/chp.c
@@ -15,6 +15,7 @@
 #include <linux/wait.h>
 #include <linux/mutex.h>
 #include <linux/errno.h>
+#include <linux/fs.h>
 #include <asm/chpid.h>
 #include <asm/sclp.h>
 
@@ -141,21 +142,14 @@ static ssize_t chp_measurement_chars_rea
 {
 	struct channel_path *chp;
 	struct device *device;
-	unsigned int size;
 
 	device = container_of(kobj, struct device, kobj);
 	chp = to_channelpath(device);
 	if (!chp->cmg_chars)
 		return 0;
 
-	size = sizeof(struct cmg_chars);
-
-	if (off > size)
-		return 0;
-	if (off + count > size)
-		count = size - off;
-	memcpy(buf, chp->cmg_chars + off, count);
-	return count;
+	return memory_read_from_buffer(buf, count, &off,
+				chp->cmg_chars, sizeof(struct cmg_chars));
 }
 
 static struct bin_attribute chp_measurement_chars_attr = {

-- 

[patch -v3 20/22] s390: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: s390-ipl-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1685 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: linux390@de.ibm.com
Cc: linux-s390@vger.kernel.org
---
 arch/s390/kernel/ipl.c |   18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

Index: 2.6-git/arch/s390/kernel/ipl.c
===================================================================
--- 2.6-git.orig/arch/s390/kernel/ipl.c
+++ 2.6-git/arch/s390/kernel/ipl.c
@@ -14,6 +14,7 @@
 #include <linux/delay.h>
 #include <linux/reboot.h>
 #include <linux/ctype.h>
+#include <linux/fs.h>
 #include <asm/ipl.h>
 #include <asm/smp.h>
 #include <asm/setup.h>
@@ -285,14 +286,8 @@ static struct kobj_attribute sys_ipl_dev
 static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
 				  char *buf, loff_t off, size_t count)
 {
-	unsigned int size = IPL_PARMBLOCK_SIZE;
-
-	if (off > size)
-		return 0;
-	if (off + count > size)
-		count = size - off;
-	memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
-	return count;
+	return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
+					IPL_PARMBLOCK_SIZE);
 }
 
 static struct bin_attribute ipl_parameter_attr = {
@@ -310,12 +305,7 @@ static ssize_t ipl_scp_data_read(struct 
 	unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
 	void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
 
-	if (off > size)
-		return 0;
-	if (off + count > size)
-		count = size - off;
-	memcpy(buf, scp_data + off, count);
-	return count;
+	return memory_read_from_buffer(buf, count, &off, scp_data, size);
 }
 
 static struct bin_attribute ipl_scp_data_attr = {

-- 

[patch -v3 21/22] ipr: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: scsi-ipr-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 1185 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Brian King <brking@us.ibm.com>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: linux-scsi@vger.kernel.org
---
 drivers/scsi/ipr.c |   16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

Index: 2.6-git/drivers/scsi/ipr.c
===================================================================
--- 2.6-git.orig/drivers/scsi/ipr.c
+++ 2.6-git/drivers/scsi/ipr.c
@@ -2455,20 +2455,14 @@ static ssize_t ipr_read_trace(struct kob
 	struct Scsi_Host *shost = class_to_shost(dev);
 	struct ipr_ioa_cfg *ioa_cfg = (struct ipr_ioa_cfg *)shost->hostdata;
 	unsigned long lock_flags = 0;
-	int size = IPR_TRACE_SIZE;
-	char *src = (char *)ioa_cfg->trace;
-
-	if (off > size)
-		return 0;
-	if (off + count > size) {
-		size -= off;
-		count = size;
-	}
+	ssize_t ret;
 
 	spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags);
-	memcpy(buf, &src[off], count);
+	ret = memory_read_from_buffer(buf, count, &off, ioa_cfg->trace,
+				IPR_TRACE_SIZE);
 	spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
-	return count;
+
+	return ret;
 }
 
 static struct bin_attribute ipr_trace_attr = {

-- 

[patch -v3 22/22] qla2xxx: use memory_read_from_buffer

[Akinobu Mita]

[-- Attachment #1: scsi-qla2xxx-use-memory-read-from-buffer.patch --]
[-- Type: text/plain, Size: 2893 bytes --]

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Andrew Vasquez <linux-driver@qlogic.com>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: linux-scsi@vger.kernel.org
---
 drivers/scsi/qla2xxx/qla_attr.c |   45 ++++++++--------------------------------
 1 file changed, 10 insertions(+), 35 deletions(-)

Index: 2.6-git/drivers/scsi/qla2xxx/qla_attr.c
===================================================================
--- 2.6-git.orig/drivers/scsi/qla2xxx/qla_attr.c
+++ 2.6-git/drivers/scsi/qla2xxx/qla_attr.c
@@ -8,6 +8,7 @@
 
 #include <linux/kthread.h>
 #include <linux/vmalloc.h>
+#include <linux/fs.h>
 
 static int qla24xx_vport_disable(struct fc_vport *, bool);
 
@@ -20,18 +21,12 @@ qla2x00_sysfs_read_fw_dump(struct kobjec
 {
 	struct scsi_qla_host *ha = shost_priv(dev_to_shost(container_of(kobj,
 	    struct device, kobj)));
-	char *rbuf = (char *)ha->fw_dump;
 
 	if (ha->fw_dump_reading == 0)
 		return 0;
-	if (off > ha->fw_dump_len)
-                return 0;
-	if (off + count > ha->fw_dump_len)
-		count = ha->fw_dump_len - off;
 
-	memcpy(buf, &rbuf[off], count);
-
-	return (count);
+	return memory_read_from_buffer(buf, count, &off, ha->fw_dump,
+					ha->fw_dump_len);
 }
 
 static ssize_t
@@ -91,20 +86,13 @@ qla2x00_sysfs_read_nvram(struct kobject 
 {
 	struct scsi_qla_host *ha = shost_priv(dev_to_shost(container_of(kobj,
 	    struct device, kobj)));
-	int		size = ha->nvram_size;
-	char		*nvram_cache = ha->nvram;
 
-	if (!capable(CAP_SYS_ADMIN) || off > size || count == 0)
+	if (!capable(CAP_SYS_ADMIN))
 		return 0;
-	if (off + count > size) {
-		size -= off;
-		count = size;
-	}
 
 	/* Read NVRAM data from cache. */
-	memcpy(buf, &nvram_cache[off], count);
-
-	return count;
+	return memory_read_from_buffer(buf, count, &off, ha->nvram,
+					ha->nvram_size);
 }
 
 static ssize_t
@@ -172,14 +160,9 @@ qla2x00_sysfs_read_optrom(struct kobject
 
 	if (ha->optrom_state != QLA_SREADING)
 		return 0;
-	if (off > ha->optrom_region_size)
-		return 0;
-	if (off + count > ha->optrom_region_size)
-		count = ha->optrom_region_size - off;
 
-	memcpy(buf, &ha->optrom_buffer[off], count);
-
-	return count;
+	return memory_read_from_buffer(buf, count, &off, ha->optrom_buffer,
+					ha->optrom_region_size);
 }
 
 static ssize_t
@@ -371,20 +354,12 @@ qla2x00_sysfs_read_vpd(struct kobject *k
 {
 	struct scsi_qla_host *ha = shost_priv(dev_to_shost(container_of(kobj,
 	    struct device, kobj)));
-	int           size = ha->vpd_size;
-	char          *vpd_cache = ha->vpd;
 
-	if (!capable(CAP_SYS_ADMIN) || off > size || count == 0)
+	if (!capable(CAP_SYS_ADMIN))
 		return 0;
-	if (off + count > size) {
-		size -= off;
-		count = size;
-	}
 
 	/* Read NVRAM data from cache. */
-	memcpy(buf, &vpd_cache[off], count);
-
-	return count;
+	return memory_read_from_buffer(buf, count, &off, ha->vpd, ha->vpd_size);
 }
 
 static ssize_t

-- 

Re: [patch -v3 16/22] acpi: use memory_read_from_buffer

[Zhao Yakui]

On Wed, 2008-06-04 at 20:56 +0900, Akinobu Mita wrote:
> plain text document attachment
> (acpi-use-memory-read-from-buffer.patch)
> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> Cc: Len Brown <len.brown@intel.com>
> Cc: linux-acpi@vger.kernel.org
> ---
>  drivers/acpi/system.c |   15 ++-------------
>  1 file changed, 2 insertions(+), 13 deletions(-)
> 
> Index: 2.6-git/drivers/acpi/system.c
> ===================================================================
> --- 2.6-git.orig/drivers/acpi/system.c
> +++ 2.6-git/drivers/acpi/system.c
> @@ -77,7 +77,6 @@ static ssize_t acpi_table_show(struct ko
>  	    container_of(bin_attr, struct acpi_table_attr, attr);
>  	struct acpi_table_header *table_header = NULL;
>  	acpi_status status;
> -	ssize_t ret_count = count;
>  
>  	status =
>  	    acpi_get_table(table_attr->name, table_attr->instance,
> @@ -85,18 +84,8 @@ static ssize_t acpi_table_show(struct ko
>  	if (ACPI_FAILURE(status))
>  		return -ENODEV;
>  
> -	if (offset >= table_header->length) {
> -		ret_count = 0;
> -		goto end;
> -	}
> -
> -	if (offset + ret_count > table_header->length)
> -		ret_count = table_header->length - offset;
> -
> -	memcpy(buf, ((char *)table_header) + offset, ret_count);
> -
> -      end:
> -	return ret_count;
> +	return memory_read_from_buffer(buf, count, &offset,
> +					table_header, table_header->length);
>  }
it seems that there is no definition of memory_read_from_buffer. 
Where is the function of memory_read_from_buffer defined?
Is there a bug about the current function of acpi_table_show?
Thanks.
>  
>  static void acpi_table_attr_init(struct acpi_table_attr *table_attr,
> 

Re: [patch -v3 16/22] acpi: use memory_read_from_buffer

[Andrew Morton]

On Thu, 05 Jun 2008 09:21:26 +0800 Zhao Yakui <yakui.zhao@intel.com> wrote:

> On Wed, 2008-06-04 at 20:56 +0900, Akinobu Mita wrote:
> > plain text document attachment
> > (acpi-use-memory-read-from-buffer.patch)
> > Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> > Cc: Len Brown <len.brown@intel.com>
> > Cc: linux-acpi@vger.kernel.org
> > ---
> >  drivers/acpi/system.c |   15 ++-------------
> >  1 file changed, 2 insertions(+), 13 deletions(-)
> > 
> > Index: 2.6-git/drivers/acpi/system.c
> > ===================================================================
> > --- 2.6-git.orig/drivers/acpi/system.c
> > +++ 2.6-git/drivers/acpi/system.c
> > @@ -77,7 +77,6 @@ static ssize_t acpi_table_show(struct ko
> >  	    container_of(bin_attr, struct acpi_table_attr, attr);
> >  	struct acpi_table_header *table_header = NULL;
> >  	acpi_status status;
> > -	ssize_t ret_count = count;
> >  
> >  	status =
> >  	    acpi_get_table(table_attr->name, table_attr->instance,
> > @@ -85,18 +84,8 @@ static ssize_t acpi_table_show(struct ko
> >  	if (ACPI_FAILURE(status))
> >  		return -ENODEV;
> >  
> > -	if (offset >= table_header->length) {
> > -		ret_count = 0;
> > -		goto end;
> > -	}
> > -
> > -	if (offset + ret_count > table_header->length)
> > -		ret_count = table_header->length - offset;
> > -
> > -	memcpy(buf, ((char *)table_header) + offset, ret_count);
> > -
> > -      end:
> > -	return ret_count;
> > +	return memory_read_from_buffer(buf, count, &offset,
> > +					table_header, table_header->length);
> >  }
> it seems that there is no definition of memory_read_from_buffer. 
> Where is the function of memory_read_from_buffer defined?

Earlier in the patch series.  (The "16/22" is a hint!)

> Is there a bug about the current function of acpi_table_show?

No, it's just a cleanup.


From: Akinobu Mita <akinobu.mita@gmail.com>

This patch introduces memory_read_from_buffer().

The only difference between memory_read_from_buffer() and
simple_read_from_buffer() is which address space the function copies to.

simple_read_from_buffer copies to user space memory.
memory_read_from_buffer copies to normal memory.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Doug Warzecha <Douglas_Warzecha@dell.com>
Cc: Zhang Rui <rui.zhang@intel.com>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Cc: Abhay Salunke <Abhay_Salunke@dell.com>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Markus Rechberger <markus.rechberger@amd.com>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Bob Moore <robert.moore@intel.com>
Cc: Thomas Renninger <trenn@suse.de>
Cc: Len Brown <lenb@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Cc: Michael Holzheu <holzheu@de.ibm.com>
Cc: Brian King <brking@us.ibm.com>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Andrew Vasquez <linux-driver@qlogic.com>
Cc: Seokmann Ju <seokmann.ju@qlogic.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/libfs.c         |   18 ++++++++++++++++++
 include/linux/fs.h |    5 ++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff -puN fs/libfs.c~introduce-memory_read_from_buffer fs/libfs.c
--- a/fs/libfs.c~introduce-memory_read_from_buffer
+++ a/fs/libfs.c
@@ -528,6 +528,23 @@ ssize_t simple_read_from_buffer(void __u
 	return count;
 }
 
+ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
+				const void *from, size_t available)
+{
+	loff_t pos = *ppos;
+
+	if (pos < 0)
+		return -EINVAL;
+	if (pos >= available)
+		return 0;
+	if (count > available - pos)
+		count = available - pos;
+	memcpy(to, from + pos, count);
+	*ppos = pos + count;
+
+	return count;
+}
+
 /*
  * Transaction based IO.
  * The file expects a single write which triggers the transaction, and then
@@ -800,6 +817,7 @@ EXPORT_SYMBOL(simple_statfs);
 EXPORT_SYMBOL(simple_sync_file);
 EXPORT_SYMBOL(simple_unlink);
 EXPORT_SYMBOL(simple_read_from_buffer);
+EXPORT_SYMBOL(memory_read_from_buffer);
 EXPORT_SYMBOL(simple_transaction_get);
 EXPORT_SYMBOL(simple_transaction_read);
 EXPORT_SYMBOL(simple_transaction_release);
diff -puN include/linux/fs.h~introduce-memory_read_from_buffer include/linux/fs.h
--- a/include/linux/fs.h~introduce-memory_read_from_buffer
+++ a/include/linux/fs.h
@@ -2025,7 +2025,10 @@ extern int simple_fill_super(struct supe
 extern int simple_pin_fs(struct file_system_type *, struct vfsmount **mount, int *count);
 extern void simple_release_fs(struct vfsmount **mount, int *count);
 
-extern ssize_t simple_read_from_buffer(void __user *, size_t, loff_t *, const void *, size_t);
+extern ssize_t simple_read_from_buffer(void __user *to, size_t count,
+			loff_t *ppos, const void *from, size_t available);
+extern ssize_t memory_read_from_buffer(void *to, size_t count, loff_t *ppos,
+			const void *from, size_t available);
 
 #ifdef CONFIG_MIGRATION
 extern int buffer_migrate_page(struct address_space *,
_

Re: [patch -v3 22/22] qla2xxx: use memory_read_from_buffer

[Andrew Vasquez]

On Wed, 04 Jun 2008, Akinobu Mita wrote:

> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> Cc: Andrew Vasquez <linux-driver@qlogic.com>
> Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
> Cc: linux-scsi@vger.kernel.org
> ---
>  drivers/scsi/qla2xxx/qla_attr.c |   45 ++++++++--------------------------------
>  1 file changed, 10 insertions(+), 35 deletions(-)

Basic testing looks good.  Thanks.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>

Re: [patch -v3 02/22] ocfs2: use simple_read_from_buffer

[Joel Becker]

On Wed, Jun 04, 2008 at 08:56:35PM +0900, Akinobu Mita wrote:
> Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
> Cc: Mark Fasheh <mfasheh@suse.com>
> Cc: Joel Becker <joel.becker@oracle.com>
> Cc: ocfs2-devel@oss.oracle.com 

Acked-by: Joel Becker <joel.becker@oracle.com>


-- 

"Heav'n hath no rage like love to hatred turn'd, nor Hell a fury,
 like a woman scorn'd."
        - William Congreve

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127