Embed block device name in struct block_device, thus we can replace
the following code:
char b[BDEVNAME_SIZE];
printk(KERN_XXX "...%s..\n", bdevname(bdev, b);
with a much simpler and less stack usage version:
printk(KERN_XXX "...%s..\n", bdev->bd_name);
This is a RFC version, which I just included one sample with this change
appiled. If this patch makes sense to you, I will file more patches to
apply this change.
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Yuanhan Liu <yuanhan.liu@xxxxxxxxxxxxxxx>
---
fs/block_dev.c | 2 ++
include/linux/fs.h | 3 ++-
2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 1e51919..5e796e58 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -1213,6 +1213,8 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
}
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9);
}
+
+ disk_name(bdev->bd_disk, bdev->bd_part->partno, bdev->bd_name);
} else {
if (bdev->bd_contains == bdev) {
ret = 0;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index aa11047..98ea89d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -689,6 +689,7 @@ struct address_space {
*/
struct request_queue;
+#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
struct block_device {
dev_t bd_dev; /* not a kdev_t - it's a search key */
int bd_openers;
@@ -724,6 +725,7 @@ struct block_device {
int bd_fsfreeze_count;
/* Mutex for freeze */
struct mutex bd_fsfreeze_mutex;
+ char bd_name[BDEVNAME_SIZE];
};
/*
@@ -2323,7 +2325,6 @@ static inline void unregister_chrdev(unsigned int major, const char *name)
}
/* fs/block_dev.c */
-#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
#ifdef CONFIG_BLOCK
--
1.7.7.6
--
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