linux/fs/pstore/internal.h

extern void	pstore_set_kmsg_bytes(int);
extern void	pstore_get_records(int);
extern int	pstore_mkfile(enum pstore_type_id, char *psname, u64 id,
			      char *data, size_t size,
			      struct timespec time, struct pstore_info *psi);
extern int	pstore_is_mounted(void);
pstore: use mount option instead sysfs to tweak kmsg_bytes /sys/fs is a somewhat strange way to tweak what could more obviously be tuned with a mount option. Suggested-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> 2011-03-18 15:33:43 -07:00			`extern void pstore_set_kmsg_bytes(int);`
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> 2011-08-11 15:14:39 -07:00			`extern void pstore_get_records(int);`
pstore: new filesystem interface to platform persistent storage Some platforms have a small amount of non-volatile storage that can be used to store information useful to diagnose the cause of a system crash. This is the generic part of a file system interface that presents information from the crash as a series of files in /dev/pstore. Once the information has been seen, the underlying storage is freed by deleting the files. Signed-off-by: Tony Luck <tony.luck@intel.com> 2010-12-28 14:25:21 -08:00			`extern int pstore_mkfile(enum pstore_type_id, char *psname, u64 id,`
			`char *data, size_t size,`
pstore: Extend API for more flexibility in new backends Some pstore implementations may not have a static context, so extend the API to pass the pstore_info struct to all calls and allow for a context pointer. Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Tony Luck <tony.luck@intel.com> 2011-07-21 16:57:52 -04:00			`struct timespec time, struct pstore_info *psi);`
pstore: new filesystem interface to platform persistent storage Some platforms have a small amount of non-volatile storage that can be used to store information useful to diagnose the cause of a system crash. This is the generic part of a file system interface that presents information from the crash as a series of files in /dev/pstore. Once the information has been seen, the underlying storage is freed by deleting the files. Signed-off-by: Tony Luck <tony.luck@intel.com> 2010-12-28 14:25:21 -08:00			`extern int pstore_is_mounted(void);`