X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fread_write.c;h=1f8dc373ede7755124a0d5da510f05beb7ce784f;hb=7e8bddf56661a16b7d5945390a37cd2e9c5e45fe;hp=4ed839bcb91caa3301f13245cf725bc0c46873bf;hpb=543ade1fc901db4c3dbe9fb27241fb977f1f3eea;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/read_write.c b/fs/read_write.c
index 4ed839b..1f8dc37 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -64,13 +64,13 @@ loff_t remote_llseek(struct file *file, loff_t offset, int origin)
 	lock_kernel();
 	switch (origin) {
 		case 2:
-			offset += i_size_read(file->f_dentry->d_inode);
+			offset += i_size_read(file->f_path.dentry->d_inode);
 			break;
 		case 1:
 			offset += file->f_pos;
 	}
 	retval = -EINVAL;
-	if (offset>=0 && offset<=file->f_dentry->d_inode->i_sb->s_maxbytes) {
+	if (offset>=0 && offset<=file->f_path.dentry->d_inode->i_sb->s_maxbytes) {
 		if (offset != file->f_pos) {
 			file->f_pos = offset;
 			file->f_version = 0;
@@ -95,7 +95,7 @@ loff_t default_llseek(struct file *file, loff_t offset, int origin)
 	lock_kernel();
 	switch (origin) {
 		case 2:
-			offset += i_size_read(file->f_dentry->d_inode);
+			offset += i_size_read(file->f_path.dentry->d_inode);
 			break;
 		case 1:
 			offset += file->f_pos;
@@ -197,13 +197,13 @@ int rw_verify_area(int read_write, struct file *file, loff_t *ppos, size_t count
 	struct inode *inode;
 	loff_t pos;
 
+	inode = file->f_path.dentry->d_inode;
 	if (unlikely((ssize_t) count < 0))
 		goto Einval;
 	pos = *ppos;
 	if (unlikely((pos < 0) || (loff_t) (pos + count) < 0))
 		goto Einval;
 
-	inode = file->f_dentry->d_inode;
 	if (unlikely(inode->i_flock && MANDATORY_LOCK(inode))) {
 		int retval = locks_mandatory_area(
 			read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
@@ -273,10 +273,10 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos)
 			else
 				ret = do_sync_read(file, buf, count, pos);
 			if (ret > 0) {
-				fsnotify_access(file->f_dentry);
-				current->rchar += ret;
+				fsnotify_access(file->f_path.dentry);
+				add_rchar(current, ret);
 			}
-			current->syscr++;
+			inc_syscr(current);
 		}
 	}
 
@@ -331,10 +331,10 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_
 			else
 				ret = do_sync_write(file, buf, count, pos);
 			if (ret > 0) {
-				fsnotify_modify(file->f_dentry);
-				current->wchar += ret;
+				fsnotify_modify(file->f_path.dentry);
+				add_wchar(current, ret);
 			}
-			current->syscw++;
+			inc_syscw(current);
 		}
 	}
 
@@ -450,8 +450,6 @@ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to)
 	return seg;
 }
 
-EXPORT_UNUSED_SYMBOL(iov_shorten);  /*  June 2006  */
-
 ssize_t do_sync_readv_writev(struct file *filp, const struct iovec *iov,
 		unsigned long nr_segs, size_t len, loff_t *ppos, iov_fn_t fn)
 {
@@ -511,6 +509,74 @@ ssize_t do_loop_readv_writev(struct file *filp, struct iovec *iov,
 /* A write operation does a read from user space and vice versa */
 #define vrfy_dir(type) ((type) == READ ? VERIFY_WRITE : VERIFY_READ)
 
+ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
+			      unsigned long nr_segs, unsigned long fast_segs,
+			      struct iovec *fast_pointer,
+			      struct iovec **ret_pointer)
+  {
+	unsigned long seg;
+  	ssize_t ret;
+	struct iovec *iov = fast_pointer;
+
+  	/*
+  	 * SuS says "The readv() function *may* fail if the iovcnt argument
+  	 * was less than or equal to 0, or greater than {IOV_MAX}.  Linux has
+  	 * traditionally returned zero for zero segments, so...
+  	 */
+	if (nr_segs == 0) {
+		ret = 0;
+  		goto out;
+	}
+
+  	/*
+  	 * First get the "struct iovec" from user memory and
+  	 * verify all the pointers
+  	 */
+	if (nr_segs > UIO_MAXIOV) {
+		ret = -EINVAL;
+  		goto out;
+	}
+	if (nr_segs > fast_segs) {
+  		iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
+		if (iov == NULL) {
+			ret = -ENOMEM;
+  			goto out;
+		}
+  	}
+	if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector))) {
+		ret = -EFAULT;
+  		goto out;
+	}
+
+  	/*
+	 * According to the Single Unix Specification we should return EINVAL
+	 * if an element length is < 0 when cast to ssize_t or if the
+	 * total length would overflow the ssize_t return value of the
+	 * system call.
+  	 */
+	ret = 0;
+  	for (seg = 0; seg < nr_segs; seg++) {
+  		void __user *buf = iov[seg].iov_base;
+  		ssize_t len = (ssize_t)iov[seg].iov_len;
+
+		/* see if we we're about to use an invalid len or if
+		 * it's about to overflow ssize_t */
+		if (len < 0 || (ret + len < ret)) {
+			ret = -EINVAL;
+  			goto out;
+		}
+		if (unlikely(!access_ok(vrfy_dir(type), buf, len))) {
+			ret = -EFAULT;
+  			goto out;
+		}
+
+		ret += len;
+  	}
+out:
+	*ret_pointer = iov;
+	return ret;
+}
+
 static ssize_t do_readv_writev(int type, struct file *file,
 			       const struct iovec __user * uvector,
 			       unsigned long nr_segs, loff_t *pos)
@@ -519,64 +585,20 @@ static ssize_t do_readv_writev(int type, struct file *file,
 	struct iovec iovstack[UIO_FASTIOV];
 	struct iovec *iov = iovstack;
 	ssize_t ret;
-	int seg;
 	io_fn_t fn;
 	iov_fn_t fnv;
 
-	/*
-	 * SuS says "The readv() function *may* fail if the iovcnt argument
-	 * was less than or equal to 0, or greater than {IOV_MAX}.  Linux has
-	 * traditionally returned zero for zero segments, so...
-	 */
-	ret = 0;
-	if (nr_segs == 0)
-		goto out;
-
-	/*
-	 * First get the "struct iovec" from user memory and
-	 * verify all the pointers
-	 */
-	ret = -EINVAL;
-	if (nr_segs > UIO_MAXIOV)
-		goto out;
-	if (!file->f_op)
-		goto out;
-	if (nr_segs > UIO_FASTIOV) {
-		ret = -ENOMEM;
-		iov = kmalloc(nr_segs*sizeof(struct iovec), GFP_KERNEL);
-		if (!iov)
-			goto out;
-	}
-	ret = -EFAULT;
-	if (copy_from_user(iov, uvector, nr_segs*sizeof(*uvector)))
+	if (!file->f_op) {
+		ret = -EINVAL;
 		goto out;
+	}
 
-	/*
-	 * Single unix specification:
-	 * We should -EINVAL if an element length is not >= 0 and fitting an
-	 * ssize_t.  The total length is fitting an ssize_t
-	 *
-	 * Be careful here because iov_len is a size_t not an ssize_t
-	 */
-	tot_len = 0;
-	ret = -EINVAL;
-	for (seg = 0; seg < nr_segs; seg++) {
-		void __user *buf = iov[seg].iov_base;
-		ssize_t len = (ssize_t)iov[seg].iov_len;
-
-		if (len < 0)	/* size_t not fitting an ssize_t .. */
-			goto out;
-		if (unlikely(!access_ok(vrfy_dir(type), buf, len)))
-			goto Efault;
-		tot_len += len;
-		if ((ssize_t)tot_len < 0) /* maths overflow on the ssize_t */
-			goto out;
-	}
-	if (tot_len == 0) {
-		ret = 0;
+	ret = rw_copy_check_uvector(type, uvector, nr_segs,
+			ARRAY_SIZE(iovstack), iovstack, &iov);
+	if (ret <= 0)
 		goto out;
-	}
 
+	tot_len = ret;
 	ret = rw_verify_area(type, file, pos, tot_len);
 	if (ret < 0)
 		goto out;
@@ -604,14 +626,11 @@ out:
 		kfree(iov);
 	if ((ret + (type == READ)) > 0) {
 		if (type == READ)
-			fsnotify_access(file->f_dentry);
+			fsnotify_access(file->f_path.dentry);
 		else
-			fsnotify_modify(file->f_dentry);
+			fsnotify_modify(file->f_path.dentry);
 	}
 	return ret;
-Efault:
-	ret = -EFAULT;
-	goto out;
 }
 
 ssize_t vfs_readv(struct file *file, const struct iovec __user *vec,
@@ -656,8 +675,8 @@ sys_readv(unsigned long fd, const struct iovec __user *vec, unsigned long vlen)
 	}
 
 	if (ret > 0)
-		current->rchar += ret;
-	current->syscr++;
+		add_rchar(current, ret);
+	inc_syscr(current);
 	return ret;
 }
 
@@ -677,8 +696,8 @@ sys_writev(unsigned long fd, const struct iovec __user *vec, unsigned long vlen)
 	}
 
 	if (ret > 0)
-		current->wchar += ret;
-	current->syscw++;
+		add_wchar(current, ret);
+	inc_syscw(current);
 	return ret;
 }
 
@@ -701,7 +720,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 	if (!(in_file->f_mode & FMODE_READ))
 		goto fput_in;
 	retval = -EINVAL;
-	in_inode = in_file->f_dentry->d_inode;
+	in_inode = in_file->f_path.dentry->d_inode;
 	if (!in_inode)
 		goto fput_in;
 	if (!in_file->f_op || !in_file->f_op->sendfile)
@@ -733,7 +752,7 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 	retval = -EINVAL;
 	if (!out_file->f_op || !out_file->f_op->sendpage)
 		goto fput_out;
-	out_inode = out_file->f_dentry->d_inode;
+	out_inode = out_file->f_path.dentry->d_inode;
 	retval = rw_verify_area(WRITE, out_file, &out_file->f_pos, count);
 	if (retval < 0)
 		goto fput_out;
@@ -760,12 +779,12 @@ static ssize_t do_sendfile(int out_fd, int in_fd, loff_t *ppos,
 	retval = in_file->f_op->sendfile(in_file, ppos, count, file_send_actor, out_file);
 
 	if (retval > 0) {
-		current->rchar += retval;
-		current->wchar += retval;
+		add_rchar(current, retval);
+		add_wchar(current, retval);
 	}
-	current->syscr++;
-	current->syscw++;
 
+	inc_syscr(current);
+	inc_syscw(current);
 	if (*ppos > max)
 		retval = -EOVERFLOW;