In preparation of moving DAX capability checks to the block layer
from filesystem code, add a VFS message interface that aligns with
filesystem's message format.
For instance, a vfs_msg() message followed by XFS messages in case
of a dax mount error may look like:
VFS (pmem0p1): error: unaligned partition for dax
XFS (pmem0p1): DAX unsupported by block device. Turning off DAX.
XFS (pmem0p1): Mounting V5 Filesystem
:
vfs_msg() is largely based on ext4_msg().
Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Boaz Harrosh <boaz@xxxxxxxxxxxxx>
---
fs/block_dev.c | 12 ++++++++++++
include/linux/blkdev.h | 11 +++++++++++
2 files changed, 23 insertions(+)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 20a2c02..7be17c4 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -50,6 +50,18 @@ struct block_device *I_BDEV(struct inode *inode)
}
EXPORT_SYMBOL(I_BDEV);
+void __vfs_msg(struct super_block *sb, const char *prefix, const char *fmt, ...)
+{
+ struct va_format vaf;
+ va_list args;
+
+ va_start(args, fmt);
+ vaf.fmt = fmt;
+ vaf.va = &args;
+ printk_ratelimited("%sVFS (%s): %pV\n", prefix, sb->s_id, &vaf);
+ va_end(args);
+}
+
static void bdev_write_inode(struct block_device *bdev)
{
struct inode *inode = bdev->bd_inode;
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 669e419..78c48ab 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -767,6 +767,17 @@ static inline void rq_flush_dcache_pages(struct request *rq)
}
#endif
+#ifdef CONFIG_PRINTK
+#define vfs_msg(sb, level, fmt, ...) \
+ __vfs_msg(sb, level, fmt, ##__VA_ARGS__)
+#else
+#define vfs_msg(sb, level, fmt, ...) \
+do { \
+ no_printk(fmt, ##__VA_ARGS__); \
+ __vfs_msg(sb, "", " "); \
+} while (0)
+#endif
+
extern int blk_register_queue(struct gendisk *disk);
extern void blk_unregister_queue(struct gendisk *disk);
extern blk_qc_t generic_make_request(struct bio *bio);
--
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