From: Irina Tirdea <irina.tirdea@intel.com>
To: Anton Vorontsov <cbouatmailru@gmail.com>,
Colin Cross <ccross@android.com>,
Kees Cook <keescook@chromium.org>,
Tony Luck <tony.luck@intel.com>, Chris Ball <cjb@laptop.org>
Cc: linux-kernel@vger.kernel.org,
Adrian Hunter <adrian.hunter@intel.com>,
Octavian Purdila <octavian.purdila@intel.com>,
Irina Tirdea <irina.tirdea@intel.com>
Subject: [PATCH 05/26] block: add panic write
Date: Tue, 23 Oct 2012 16:48:03 +0300 [thread overview]
Message-ID: <1351000104-13015-6-git-send-email-irina.tirdea@intel.com> (raw)
In-Reply-To: <1351000104-13015-1-git-send-email-irina.tirdea@intel.com>
From: Adrian Hunter <adrian.hunter@intel.com>
Add a small interface to allow block devices to attempt to write
during an oops or panic.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Irina Tirdea <irina.tirdea@intel.com>
---
drivers/block/Kconfig | 3 ++
include/linux/blkdev.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/genhd.h | 3 ++
3 files changed, 83 insertions(+)
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 332ba52..f58853c 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -553,4 +553,7 @@ config BLK_DEV_OOPS
See <file:Documentation/blockdev/blkoops.txt> for more information.
+config BLK_DEV_PANIC_WRITE
+ bool
+
endif # BLK_DEV
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1756001..bedfaab 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1461,6 +1461,83 @@ static inline bool blk_integrity_is_initialized(struct gendisk *g)
#endif /* CONFIG_BLK_DEV_INTEGRITY */
+#ifdef CONFIG_BLK_DEV_PANIC_WRITE
+
+/**
+ * struct panic_write_operations - operations to support writing during an oops
+ * or panic.
+ * @init: allocate resources
+ * @cleanup: release resources
+ * @write: called in an oops or panic context to write data
+ * @flush: called in an oops or panic context to finish write operations
+ *
+ * @write may need resources that cannot be allocated in a panic or oops
+ * context. @init can be used to allocate those resources in advance.
+ * @cleanup is called if panic writing becomes disabled.
+ */
+struct panic_write_operations {
+ int (*init)(struct block_device *);
+ void (*cleanup)(struct block_device *);
+ int (*write)(struct block_device *, sector_t, void *, unsigned long);
+ int (*flush)(struct block_device *);
+};
+
+static inline int blk_panic_init(struct block_device *bdev)
+{
+ if (!bdev->bd_disk->pwops || !bdev->bd_disk->pwops->write)
+ return -EOPNOTSUPP;
+ if (bdev->bd_disk->pwops && bdev->bd_disk->pwops->init)
+ return bdev->bd_disk->pwops->init(bdev);
+ return 0;
+}
+
+static inline void blk_panic_cleanup(struct block_device *bdev)
+{
+ if (bdev->bd_disk->pwops && bdev->bd_disk->pwops->cleanup)
+ bdev->bd_disk->pwops->cleanup(bdev);
+}
+
+static inline int blk_panic_write(struct block_device *bdev, sector_t sect,
+ void *addr, unsigned long len)
+{
+ if (!bdev->bd_disk->pwops || !bdev->bd_disk->pwops->write)
+ return -EOPNOTSUPP;
+ if (bdev != bdev->bd_contains)
+ sect += bdev->bd_part->start_sect;
+ return bdev->bd_disk->pwops->write(bdev, sect, addr, len);
+}
+
+static inline int blk_panic_flush(struct block_device *bdev)
+{
+ if (bdev->bd_disk->pwops && bdev->bd_disk->pwops->flush)
+ return bdev->bd_disk->pwops->flush(bdev);
+ return 0;
+}
+
+#else
+
+static inline int blk_panic_init(struct block_device *bdev)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline void blk_panic_cleanup(struct block_device *bdev)
+{
+}
+
+static inline int blk_panic_write(struct block_device *bdev, sector_t sect,
+ void *addr, unsigned long len)
+{
+ return -EOPNOTSUPP;
+}
+
+static inline int blk_panic_flush(struct block_device *bdev)
+{
+ return -EOPNOTSUPP;
+}
+
+#endif /* CONFIG_BLK_DEV_PANIC_WRITE */
+
struct block_device_operations {
int (*open) (struct block_device *, fmode_t);
int (*release) (struct gendisk *, fmode_t);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 4f440b3..73470af 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -195,6 +195,9 @@ struct gendisk {
#ifdef CONFIG_BLK_DEV_INTEGRITY
struct blk_integrity *integrity;
#endif
+#ifdef CONFIG_BLK_DEV_PANIC_WRITE
+ const struct panic_write_operations *pwops;
+#endif
int node_id;
};
--
1.7.9.5
next prev parent reply other threads:[~2012-10-23 13:43 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-23 13:47 [PATCH 00/26] pstore, mmc: add mmc as backend for pstore Irina Tirdea
2012-10-23 13:47 ` [PATCH 01/26] pstore: allow for big files Irina Tirdea
2012-10-23 16:48 ` Kees Cook
2012-10-25 8:54 ` Tatulea, Dragos
2012-10-23 13:48 ` [PATCH 02/26] pstore: add flags Irina Tirdea
2012-10-23 16:54 ` Kees Cook
2012-10-23 16:57 ` Luck, Tony
2012-10-25 11:25 ` Tatulea, Dragos
2012-10-23 13:48 ` [PATCH 03/26] pstore: add flush Irina Tirdea
2012-10-23 16:50 ` Kees Cook
2012-10-23 13:48 ` [PATCH 04/26] blkoops: add a block device oops / panic logger Irina Tirdea
2012-10-23 13:48 ` Irina Tirdea [this message]
2012-10-23 13:48 ` [PATCH 06/26] mmc: block: add panic write support Irina Tirdea
2012-10-23 13:48 ` [PATCH 07/26] mmc: panic write: bypass host claiming Irina Tirdea
2012-10-23 13:48 ` [PATCH 08/26] mmc: panic write: bypass request completion Irina Tirdea
2012-10-23 13:48 ` [PATCH 09/26] mmc: panic write: suppress host not claimed warnings Irina Tirdea
2012-10-23 13:48 ` [PATCH 10/26] mmc: panic write: do not msleep Irina Tirdea
2012-10-23 13:48 ` [PATCH 11/26] mmc: panic write: bypass clock gating Irina Tirdea
2012-10-23 13:48 ` [PATCH 12/26] mmc: panic write: bypass regulators Irina Tirdea
2012-10-23 13:48 ` [PATCH 13/26] mmc: panic write: trap non panic tasks Irina Tirdea
2012-10-23 13:48 ` [PATCH 14/26] mmc: panic write: bypass bus ref locking Irina Tirdea
2012-10-23 13:48 ` [PATCH 15/26] mmc: sdhci: panic write: bypass spin lock Irina Tirdea
2012-10-23 13:48 ` [PATCH 16/26] mmc: sdhci: panic write: no sleeping Irina Tirdea
2012-10-23 13:48 ` [PATCH 17/26] mmc: sdhci: panic write: call tasklets inline Irina Tirdea
2012-10-23 13:48 ` [PATCH 18/26] mmc: sdhci: panic write: no timeout timer Irina Tirdea
2012-10-23 13:48 ` [PATCH 19/26] mmc: sdhci: panic write: no runtime pm Irina Tirdea
2012-10-23 13:48 ` [PATCH 20/26] mmc: sdhci: panic write: no tuning Irina Tirdea
2012-10-23 13:48 ` [PATCH 21/26] mmc: sdhci: panic write: poll interrupts Irina Tirdea
2012-10-23 13:48 ` [PATCH 22/26] mmc: sdhci: panic write: no dma mapping Irina Tirdea
2012-10-23 13:48 ` [PATCH 23/26] mmc: sdhci: panic write: resume suspended host Irina Tirdea
2012-10-23 13:48 ` [PATCH 24/26] mmc: sdhci: panic write: abort request in progress Irina Tirdea
2012-10-23 13:48 ` [PATCH 25/26] mmc: sdhci: panic write: trap nonpanic tasks Irina Tirdea
2012-10-23 13:48 ` [PATCH 26/26] mmc: sdhci-pci: add panic write support Irina Tirdea
2012-10-29 20:28 ` [PATCH 00/26] pstore, mmc: add mmc as backend for pstore Kirill A. Shutemov
2012-10-29 20:50 ` Chris Ball
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