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authorAndrew Morton <akpm@linux-foundation.org>2007-08-24 19:11:54 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-16 12:24:41 -0400
commitae87221d3ce49d9de1e43756da834fd0bf05a2ad (patch)
treef96792656b00e95c307f3f37369c98a85ce38207 /fs/sysfs/file.c
parente94320939f44e0cbaccc3f259a5778abced4949c (diff)
sysfs: crash debugging
Print the name of the last-accessed sysfs file when we oops, to help track down oopses which occur in sysfs store/read handlers. Because these oopses tend to not leave any trace of the offending code in the stack traces. Cc: Kay Sievers <kay.sievers@vrfy.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/file.c')
-rw-r--r--fs/sysfs/file.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index c9e4e5091da1..ce8339c70a4b 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -19,10 +19,18 @@
19#include <linux/poll.h> 19#include <linux/poll.h>
20#include <linux/list.h> 20#include <linux/list.h>
21#include <linux/mutex.h> 21#include <linux/mutex.h>
22#include <linux/limits.h>
22#include <asm/uaccess.h> 23#include <asm/uaccess.h>
23 24
24#include "sysfs.h" 25#include "sysfs.h"
25 26
27/* used in crash dumps to help with debugging */
28static char last_sysfs_file[PATH_MAX];
29void sysfs_printk_last_file(void)
30{
31 printk(KERN_EMERG "last sysfs file: %s\n", last_sysfs_file);
32}
33
26/* 34/*
27 * There's one sysfs_buffer for each open file and one 35 * There's one sysfs_buffer for each open file and one
28 * sysfs_open_dirent for each sysfs_dirent with one or more open 36 * sysfs_open_dirent for each sysfs_dirent with one or more open
@@ -328,6 +336,11 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
328 struct sysfs_buffer *buffer; 336 struct sysfs_buffer *buffer;
329 struct sysfs_ops *ops; 337 struct sysfs_ops *ops;
330 int error = -EACCES; 338 int error = -EACCES;
339 char *p;
340
341 p = d_path(&file->f_path, last_sysfs_file, sizeof(last_sysfs_file));
342 if (p)
343 memmove(last_sysfs_file, p, strlen(p) + 1);
331 344
332 /* need attr_sd for attr and ops, its parent for kobj */ 345 /* need attr_sd for attr and ops, its parent for kobj */
333 if (!sysfs_get_active_two(attr_sd)) 346 if (!sysfs_get_active_two(attr_sd))