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* pstore: fix pstore filesystem mount/remount issueChen Gong2011-05-161-1/+7
| | | | | | | | | | | Currently after mount/remount operation on pstore filesystem, the content on pstore will be lost. It is because current ERST implementation doesn't support multi-user usage, which moves internal pointer to the end after accessing it. Adding multi-user support for pstore usage. Signed-off-by: Chen Gong <gong.chen@linux.intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
* pstore: fix one type of return value in pstoreChen Gong2011-05-161-2/+2
| | | | | | | | | | | the return type of function _read_ in pstore is size_t, but in the callback function of _read_, the logic doesn't consider it too much, which means if negative value (assuming error here) is returned, it will be converted to positive because of type casting. ssize_t is enough for this function. Signed-off-by: Chen Gong <gong.chen@linux.intel.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
* Fix common misspellingsLucas De Marchi2011-03-311-1/+1
| | | | | | Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
* pstore: cleanups to pstore_dump()Tony Luck2011-03-221-3/+12
| | | | | | | | | | | pstore_dump() can be called with many different "reason" codes. Save the name of the code in the persistent store record. Also - only worthwhile calling pstore_mkfile for KMSG_DUMP_OOPS - that is the only one where the kernel will continue running. Reviewed-by: Seiji Aguchi <seiji.aguchi@hds.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
* pstore: use mount option instead sysfs to tweak kmsg_bytesLuck, Tony2011-03-213-37/+50
| | | | | | | | | /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>
* pstore: fix leaking ->i_privateTony Luck2011-03-211-1/+7
| | | | | | | Move kfree() of i_private out of ->unlink() and into ->evict_inode() Signed-off-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* Some fixes for pstoreTony Luck2011-03-171-60/+56
| | | | | | | | | | 1) Change from ->get_sb() to ->mount() 2) Use mount_single() instead of mount_nodev() 3) Pulled in ramfs_get_inode() & trimmed to what I need for pstore 4) Drop the ugly pstore_writefile() Just save data using kmalloc() and provide a pstore_file_read() that uses simple_read_from_buffer(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* pstore: fix build warning for unused return value from sysfs_create_fileTony Luck2011-01-061-11/+16
| | | | | | | | fs/pstore/inode.c: In function 'init_pstore_fs': fs/pstore/inode.c:266: warning: ignoring return value of 'sysfs_create_file', declared with attribute warn_unused_result Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Tony Luck <tony.luck@intel.com>
* pstore: new filesystem interface to platform persistent storageTony Luck2010-12-285-0/+509
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>
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