We currently use '&' and '|' which isn't the norm in the kernel
and doesn't allow easy atomicity.
So change to bit numbers and {set,clear,test}_bit.
This allows us to remove a spinlock/unlock (which was dubious anyway)
and some other simplifications.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/bitmap.c | 46 +++++++++++++++++++++-------------------------
drivers/md/bitmap.h | 6 +++---
2 files changed, 24 insertions(+), 28 deletions(-)
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 1fd07c5..9200ed4 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -269,7 +269,7 @@ static void write_page(struct bitmap *bitmap, struct page *page, int wait)
if (bitmap->storage.file == NULL) {
switch (write_sb_page(bitmap, page, wait)) {
case -EINVAL:
- bitmap->flags |= BITMAP_WRITE_ERROR;
+ set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
}
} else {
@@ -287,20 +287,16 @@ static void write_page(struct bitmap *bitmap, struct page *page, int wait)
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
}
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
bitmap_file_kick(bitmap);
}
static void end_bitmap_write(struct buffer_head *bh, int uptodate)
{
struct bitmap *bitmap = bh->b_private;
- unsigned long flags;
- if (!uptodate) {
- spin_lock_irqsave(&bitmap->lock, flags);
- bitmap->flags |= BITMAP_WRITE_ERROR;
- spin_unlock_irqrestore(&bitmap->lock, flags);
- }
+ if (!uptodate)
+ set_bit(BITMAP_WRITE_ERROR, &bitmap->flags);
if (atomic_dec_and_test(&bitmap->pending_writes))
wake_up(&bitmap->write_wait);
}
@@ -387,7 +383,7 @@ static int read_page(struct file *file, unsigned long index,
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
ret = -EIO;
out:
if (ret)
@@ -519,7 +515,7 @@ static int bitmap_new_disk_sb(struct bitmap *bitmap)
memcpy(sb->uuid, bitmap->mddev->uuid, 16);
- bitmap->flags |= BITMAP_STALE;
+ set_bit(BITMAP_STALE, &bitmap->flags);
sb->state = cpu_to_le32(bitmap->flags);
bitmap->events_cleared = bitmap->mddev->events;
sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
@@ -543,7 +539,7 @@ static int bitmap_read_sb(struct bitmap *bitmap)
chunksize = 128 * 1024 * 1024;
daemon_sleep = 5 * HZ;
write_behind = 0;
- bitmap->flags = BITMAP_STALE;
+ set_bit(BITMAP_STALE, &bitmap->flags);
err = 0;
goto out_no_sb;
}
@@ -615,20 +611,20 @@ static int bitmap_read_sb(struct bitmap *bitmap)
"-- forcing full recovery\n",
bmname(bitmap), events,
(unsigned long long) bitmap->mddev->events);
- bitmap->flags |= BITMAP_STALE;
+ set_bit(BITMAP_STALE, &bitmap->flags);
}
}
/* assign fields using values from superblock */
bitmap->flags |= le32_to_cpu(sb->state);
if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)
- bitmap->flags |= BITMAP_HOSTENDIAN;
+ set_bit(BITMAP_HOSTENDIAN, &bitmap->flags);
bitmap->events_cleared = le64_to_cpu(sb->events_cleared);
err = 0;
out:
kunmap_atomic(sb);
out_no_sb:
- if (bitmap->flags & BITMAP_STALE)
+ if (test_bit(BITMAP_STALE, &bitmap->flags))
bitmap->events_cleared = bitmap->mddev->events;
bitmap->mddev->bitmap_info.chunksize = chunksize;
bitmap->mddev->bitmap_info.daemon_sleep = daemon_sleep;
@@ -794,8 +790,7 @@ static void bitmap_file_kick(struct bitmap *bitmap)
{
char *path, *ptr = NULL;
- if (!(bitmap->flags & BITMAP_STALE)) {
- bitmap->flags |= BITMAP_STALE;
+ if (!test_and_set_bit(BITMAP_STALE, &bitmap->flags)) {
bitmap_update_sb(bitmap);
if (bitmap->storage.file) {
@@ -866,7 +861,7 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
/* set the bit */
kaddr = kmap_atomic(page);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
+ if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
set_bit(bit, kaddr);
else
__set_bit_le(bit, kaddr);
@@ -888,7 +883,7 @@ static void bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block)
return;
bit = file_page_offset(&bitmap->storage, chunk);
paddr = kmap_atomic(page);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
+ if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
clear_bit(bit, paddr);
else
__clear_bit_le(bit, paddr);
@@ -939,7 +934,7 @@ void bitmap_unplug(struct bitmap *bitmap)
else
md_super_wait(bitmap->mddev);
}
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
bitmap_file_kick(bitmap);
}
EXPORT_SYMBOL(bitmap_unplug);
@@ -986,7 +981,7 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
return 0;
}
- outofdate = bitmap->flags & BITMAP_STALE;
+ outofdate = test_bit(BITMAP_STALE, &bitmap->flags);
if (outofdate)
printk(KERN_INFO "%s: bitmap file is out of date, doing full "
"recovery\n", bmname(bitmap));
@@ -1043,12 +1038,13 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
write_page(bitmap, page, 1);
ret = -EIO;
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR,
+ &bitmap->flags))
goto err;
}
}
paddr = kmap_atomic(page);
- if (bitmap->flags & BITMAP_HOSTENDIAN)
+ if (test_bit(BITMAP_HOSTENDIAN, &bitmap->flags))
b = test_bit(bit, paddr);
else
b = test_bit_le(bit, paddr);
@@ -1757,7 +1753,7 @@ int bitmap_create(struct mddev *mddev)
mddev->bitmap = bitmap;
- return (bitmap->flags & BITMAP_WRITE_ERROR) ? -EIO : 0;
+ return test_bit(BITMAP_WRITE_ERROR, &bitmap->flags) ? -EIO : 0;
error:
bitmap_free(bitmap);
@@ -1798,7 +1794,7 @@ int bitmap_load(struct mddev *mddev)
if (err)
goto out;
- bitmap->flags &= ~BITMAP_STALE;
+ clear_bit(BITMAP_STALE, &bitmap->flags);
/* Kick recovery in case any bits were set */
set_bit(MD_RECOVERY_NEEDED, &bitmap->mddev->recovery);
@@ -1808,7 +1804,7 @@ int bitmap_load(struct mddev *mddev)
bitmap_update_sb(bitmap);
- if (bitmap->flags & BITMAP_WRITE_ERROR)
+ if (test_bit(BITMAP_WRITE_ERROR, &bitmap->flags))
err = -EIO;
out:
return err;
diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h
index 987ad3c..ede1084 100644
--- a/drivers/md/bitmap.h
+++ b/drivers/md/bitmap.h
@@ -114,9 +114,9 @@ typedef __u16 bitmap_counter_t;
/* use these for bitmap->flags and bitmap->sb->state bit-fields */
enum bitmap_state {
- BITMAP_STALE = 0x002, /* the bitmap file is out of date or had -EIO */
- BITMAP_WRITE_ERROR = 0x004, /* A write error has occurred */
- BITMAP_HOSTENDIAN = 0x8000,
+ BITMAP_STALE = 1, /* the bitmap file is out of date or had -EIO */
+ BITMAP_WRITE_ERROR = 2, /* A write error has occurred */
+ BITMAP_HOSTENDIAN =15,
};
/* the superblock at the front of the bitmap file -- little endian */
--
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