>From b25b9a499f255ee5999c219525d82ef40382318c Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hun...@nokia.com>
Date: Wed, 23 Jun 2010 15:41:38 +0300
Subject: [PATCH 4/5] block: Add secure discard
Secure discard is the same as discard except that all copies
of the discarded sectors (perhaps created by garbage collection)
must also be erased.
Signed-off-by: Adrian Hunter <adrian.hun...@nokia.com>
---
block/blk-core.c | 6 +++++-
block/blk-lib.c | 6 ++++++
block/compat_ioctl.c | 1 +
block/elevator.c | 4 ++++
block/ioctl.c | 15 ++++++++++-----
include/linux/bio.h | 7 ++++++-
include/linux/blkdev.h | 10 +++++++++-
include/linux/fs.h | 2 ++
kernel/trace/blktrace.c | 8 ++++++++
9 files changed, 51 insertions(+), 8 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index f84cce4..6f9c6df 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1153,6 +1153,8 @@ void init_request_from_bio(struct request *req, struct
bio *bio)
req->cmd_flags |= REQ_DISCARD;
if (bio_rw_flagged(bio, BIO_RW_BARRIER))
req->cmd_flags |= REQ_SOFTBARRIER;
+ if (bio_rw_flagged(bio, BIO_RW_SECURE))
+ req->cmd_flags |= REQ_SECURE;
} else if (unlikely(bio_rw_flagged(bio, BIO_RW_BARRIER)))
req->cmd_flags |= REQ_HARDBARRIER;
@@ -1501,7 +1503,9 @@ static inline void __generic_make_request(struct bio *bio)
goto end_io;
if (bio_rw_flagged(bio, BIO_RW_DISCARD) &&
- !blk_queue_discard(q)) {
+ (!blk_queue_discard(q) ||
+ (bio_rw_flagged(bio, BIO_RW_SECURE) &&
+ !blk_queue_secdiscard(q)))) {
err = -EOPNOTSUPP;
goto end_io;
}
diff --git a/block/blk-lib.c b/block/blk-lib.c
index d0216b9..dc56682 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -52,6 +52,12 @@ int blkdev_issue_discard(struct block_device *bdev, sector_t
sector,
if (!blk_queue_discard(q))
return -EOPNOTSUPP;
+ if (flags & BLKDEV_IFL_SECURE) {
+ if (!blk_queue_secdiscard(q))
+ return -EOPNOTSUPP;
+ type |= DISCARD_SECURE;
+ }
+
while (nr_sects && !ret) {
unsigned int sector_size = q->limits.logical_block_size;
unsigned int max_discard_sectors =
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index f26051f..24a146d 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -753,6 +753,7 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd,
unsigned long arg)
case BLKFLSBUF:
case BLKROSET:
case BLKDISCARD:
+ case BLKSECDISCARD:
/*
* the ones below are implemented in blkdev_locked_ioctl,
* but we call blkdev_ioctl, which gets the lock for us
diff --git a/block/elevator.c b/block/elevator.c
index 923a913..23b5f3d 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -83,6 +83,10 @@ int elv_rq_merge_ok(struct request *rq, struct bio *bio)
bio_rw_flagged(rq->bio, BIO_RW_DISCARD))
return 0;
+ if (bio_rw_flagged(bio, BIO_RW_SECURE) !=
+ bio_rw_flagged(rq->bio, BIO_RW_SECURE))
+ return 0;
+
/*
* different data direction or already started, don't merge
*/
diff --git a/block/ioctl.c b/block/ioctl.c
index e8eb679..1fba55f 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -114,8 +114,10 @@ static int blkdev_reread_part(struct block_device *bdev)
}
static int blk_ioctl_discard(struct block_device *bdev, uint64_t start,
- uint64_t len)
+ uint64_t len, int secure)
{
+ unsigned long flags = BLKDEV_IFL_WAIT;
+
if (start & 511)
return -EINVAL;
if (len & 511)
@@ -125,8 +127,9 @@ static int blk_ioctl_discard(struct block_device *bdev,
uint64_t start,
if (start + len > (bdev->bd_inode->i_size >> 9))
return -EINVAL;
- return blkdev_issue_discard(bdev, start, len, GFP_KERNEL,
- BLKDEV_IFL_WAIT);
+ if (secure)
+ flags |= BLKDEV_IFL_SECURE;
+ return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags);
}
static int put_ushort(unsigned long arg, unsigned short val)
@@ -226,7 +229,8 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode,
unsigned cmd,
unlock_kernel();
return 0;
- case BLKDISCARD: {
+ case BLKDISCARD:
+ case BLKSECDISCARD: {
uint64_t range[2];
if (!(mode & FMODE_WRITE))
@@ -235,7 +239,8 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode,
unsigned cmd,
if (copy_from_user(range, (void __user *)arg, sizeof(range)))
return -EFAULT;
- return blk_ioctl_discard(bdev, range[0], range[1]);
+ return blk_ioctl_discard(bdev, range[0], range[1],
+ cmd == BLKSECDISCARD);
}
case HDIO_GETGEO: {
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 7fc5606..5355b42 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -160,7 +160,11 @@ struct bio {
* for flash based storage.
* Don't want driver retries for any fast fail whatever the reason.
* bit 10 -- Tell the IO scheduler not to wait for more requests after this
- one has been submitted, even if it is a SYNC request.
+ * one has been submitted, even if it is a SYNC request.
+ * bit 11 -- secure
+ * Used with BIO_RW_DISCARD to indicate a secure discard, which means
+ * all copies of the discarded sectors (perhaps created by garbage
+ * collection) are also erased.
*/
enum bio_rw_flags {
BIO_RW,
@@ -175,6 +179,7 @@ enum bio_rw_flags {
BIO_RW_META,
BIO_RW_DISCARD,
BIO_RW_NOIDLE,
+ BIO_RW_SECURE,
};
/*
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 09a8402..cff69d3 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -115,6 +115,7 @@ enum rq_flag_bits {
__REQ_NOIDLE, /* Don't anticipate more IO after this one */
__REQ_IO_STAT, /* account I/O stat */
__REQ_MIXED_MERGE, /* merge of different types, fail separately */
+ __REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */
__REQ_NR_BITS, /* stops here */
};
@@ -144,6 +145,7 @@ enum rq_flag_bits {
#define REQ_NOIDLE (1 << __REQ_NOIDLE)
#define REQ_IO_STAT (1 << __REQ_IO_STAT)
#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
+#define REQ_SECURE (1 << __REQ_SECURE)
#define REQ_FAILFAST_MASK (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \
REQ_FAILFAST_DRIVER)
@@ -467,6 +469,7 @@ struct request_queue
#define QUEUE_FLAG_IO_STAT 15 /* do IO stats */
#define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */
#define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */
+#define QUEUE_FLAG_SECDISCARD 18 /* supports SECDISCARD */
#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
(1 << QUEUE_FLAG_CLUSTER) | \
@@ -600,6 +603,8 @@ enum {
#define blk_queue_stackable(q) \
test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
+#define blk_queue_secdiscard(q) (blk_queue_discard(q) && \
+ test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags))
#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)
#define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
@@ -628,6 +633,7 @@ enum {
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
#define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD)
+#define blk_secure_rq(rq) ((rq)->cmd_flags & REQ_SECURE)
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
/* rq->queuelist of dequeued request must be list_empty() */
#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
@@ -1005,10 +1011,12 @@ static inline struct request
*blk_map_queue_find_tag(struct blk_queue_tag *bqt,
}
enum{
BLKDEV_WAIT, /* wait for completion */
- BLKDEV_BARRIER, /*issue request with barrier */
+ BLKDEV_BARRIER, /* issue request with barrier */
+ BLKDEV_SECURE, /* secure discard */
};
#define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT)
#define BLKDEV_IFL_BARRIER (1 << BLKDEV_BARRIER)
+#define BLKDEV_IFL_SECURE (1 << BLKDEV_SECURE)
extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *,
unsigned long);
extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 471e1ff..03b6e88 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -167,6 +167,7 @@ struct inodes_stat_t {
*/
#define DISCARD_NOBARRIER (WRITE | (1 << BIO_RW_DISCARD))
#define DISCARD_BARRIER (DISCARD_NOBARRIER | (1 << BIO_RW_BARRIER))
+#define DISCARD_SECURE (DISCARD_NOBARRIER | (1 << BIO_RW_SECURE))
#define SEL_IN 1
#define SEL_OUT 2
@@ -309,6 +310,7 @@ struct inodes_stat_t {
#define BLKALIGNOFF _IO(0x12,122)
#define BLKPBSZGET _IO(0x12,123)
#define BLKDISCARDZEROES _IO(0x12,124)
+#define BLKSECDISCARD _IO(0x12,125)
#define BMAP_IOCTL 1 /* obsolete - kept for compatibility */
#define FIBMAP _IO(0x00,1) /* bmap access */
diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 638711c..1391ba3 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -664,6 +664,9 @@ static void blk_add_trace_rq(struct request_queue *q,
struct request *rq,
if (blk_discard_rq(rq))
rw |= (1 << BIO_RW_DISCARD);
+ if (blk_secure_rq(rq))
+ rw |= (1 << BIO_RW_SECURE);
+
if (blk_pc_request(rq)) {
what |= BLK_TC_ACT(BLK_TC_PC);
__blk_add_trace(bt, 0, blk_rq_bytes(rq), rw,
@@ -1770,6 +1773,8 @@ void blk_fill_rwbs(char *rwbs, u32 rw, int bytes)
rwbs[i++] = 'S';
if (rw & 1 << BIO_RW_META)
rwbs[i++] = 'M';
+ if (rw & 1 << BIO_RW_SECURE)
+ rwbs[i++] = 'E';
rwbs[i] = '\0';
}
@@ -1782,6 +1787,9 @@ void blk_fill_rwbs_rq(char *rwbs, struct request *rq)
if (blk_discard_rq(rq))
rw |= (1 << BIO_RW_DISCARD);
+ if (blk_secure_rq(rq))
+ rw |= (1 << BIO_RW_SECURE);
+
bytes = blk_rq_bytes(rq);
blk_fill_rwbs(rwbs, rw, bytes);
--
1.6.3.3
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