linux-kernel - [patch 2/2] pci: write file size to inode on proc bus file write

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Message-ID: <alpine.DEB.0.9999.0709271323110.8767@chino.kir.corp.google.com>
Date:	Thu, 27 Sep 2007 13:41:17 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
cc:	linux-kernel@...r.kernel.org
Subject: [patch 2/2] pci: write file size to inode on proc bus file write

When a /proc/bus/pci file is written to, the size of that PCI device's
configuration space must be written to the inode.  Otherwise, it is
possible for the file to specify a size of 0 on stat if a task is holding
the same file open.

Signed-off-by: David Rientjes <rientjes@...gle.com>
---
 drivers/pci/proc.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -129,7 +129,7 @@ proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *pp
 static ssize_t
 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 {
-	const struct inode *ino = file->f_path.dentry->d_inode;
+	struct inode *ino = file->f_path.dentry->d_inode;
 	const struct proc_dir_entry *dp = PDE(ino);
 	struct pci_dev *dev = dp->data;
 	int pos = *ppos;
@@ -193,6 +193,7 @@ proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, lof
 	}
 
 	*ppos = pos;
+	i_size_write(ino, dp->size);
 	return nbytes;
 }
 
-
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