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authorLuck, Tony <tony.luck@intel.com>2011-08-11 15:14:39 -0700
committerTony Luck <tony.luck@intel.com>2011-08-16 11:53:01 -0700
commit6dda9266913ad57e09afc1a10d6473f10c806a63 (patch)
treec29258f6b3fd8a9bb080b395157f013f32c0f313 /fs/pstore/inode.c
parent93ee7a9340d64f20295aacc3fb6a22b759323280 (diff)
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pstore: defer inserting OOPS entries into pstore
Life is simple for all the kernel terminating types of kmsg_dump call backs - pstore just saves the tail end of the console log. But for "oops" the situation is more complex - the kernel may carry on running (possibly for ever). So we'd like to make the logged copy of the oops appear in the pstore filesystem - so that the user has a handle to clear the entry from the persistent backing store (if we don't, the store may fill with "oops" entries (that are also safely stashed in /var/log/messages) leaving no space for real errors. Current code calls pstore_mkfile() immediately. But this may not be safe. The oops could have happened with arbitrary locks held, or in interrupt or NMI context. So allocating memory and calling into generic filesystem code seems unwise. This patch defers making the entry appear. At the time of the oops, we merely set a flag "pstore_new_entry" noting that a new entry has been added. A periodic timer checks once a minute to see if the flag is set - if so, it schedules a work queue to rescan the backing store and make all new entries appear in the pstore filesystem. Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'fs/pstore/inode.c')
-rw-r--r--fs/pstore/inode.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/fs/pstore/inode.c b/fs/pstore/inode.c
index 893b961dcfd..379a02dc121 100644
--- a/fs/pstore/inode.c
+++ b/fs/pstore/inode.c
@@ -24,6 +24,7 @@
#include <linux/highmem.h>
#include <linux/time.h>
#include <linux/init.h>
+#include <linux/list.h>
#include <linux/string.h>
#include <linux/mount.h>
#include <linux/ramfs.h>
@@ -32,13 +33,18 @@
#include <linux/magic.h>
#include <linux/pstore.h>
#include <linux/slab.h>
+#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include "internal.h"
#define PSTORE_NAMELEN 64
+static DEFINE_SPINLOCK(allpstore_lock);
+static LIST_HEAD(allpstore);
+
struct pstore_private {
+ struct list_head list;
struct pstore_info *psi;
enum pstore_type_id type;
u64 id;
@@ -81,8 +87,16 @@ static int pstore_unlink(struct inode *dir, struct dentry *dentry)
static void pstore_evict_inode(struct inode *inode)
{
+ struct pstore_private *p = inode->i_private;
+ unsigned long flags;
+
end_writeback(inode);
- kfree(inode->i_private);
+ if (p) {
+ spin_lock_irqsave(&allpstore_lock, flags);
+ list_del(&p->list);
+ spin_unlock_irqrestore(&allpstore_lock, flags);
+ kfree(p);
+ }
}
static const struct inode_operations pstore_dir_inode_operations = {
@@ -182,9 +196,23 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
struct dentry *root = pstore_sb->s_root;
struct dentry *dentry;
struct inode *inode;
- int rc;
+ int rc = 0;
char name[PSTORE_NAMELEN];
- struct pstore_private *private;
+ struct pstore_private *private, *pos;
+ unsigned long flags;
+
+ spin_lock_irqsave(&allpstore_lock, flags);
+ list_for_each_entry(pos, &allpstore, list) {
+ if (pos->type == type &&
+ pos->id == id &&
+ pos->psi == psi) {
+ rc = -EEXIST;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&allpstore_lock, flags);
+ if (rc)
+ return rc;
rc = -ENOMEM;
inode = pstore_get_inode(pstore_sb, root->d_inode, S_IFREG | 0444, 0);
@@ -229,6 +257,10 @@ int pstore_mkfile(enum pstore_type_id type, char *psname, u64 id,
d_add(dentry, inode);
+ spin_lock_irqsave(&allpstore_lock, flags);
+ list_add(&private->list, &allpstore);
+ spin_unlock_irqrestore(&allpstore_lock, flags);
+
mutex_unlock(&root->d_inode->i_mutex);
return 0;
@@ -277,7 +309,7 @@ int pstore_fill_super(struct super_block *sb, void *data, int silent)
goto fail;
}
- pstore_get_records();
+ pstore_get_records(0);
return 0;
fail: