linux-kernel - [PATCH v3 1/5] block: Add vfs

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Date:	Thu,  5 May 2016 18:29:52 -0600
From:	Toshi Kani <toshi.kani@....com>
To:	dan.j.williams@...el.com, jack@...e.cz, david@...morbit.com,
	viro@...iv.linux.org.uk
Cc:	axboe@...com, hch@...radead.org, boaz@...xistor.com, tytso@....edu,
	adilger.kernel@...ger.ca, ross.zwisler@...ux.intel.com,
	toshi.kani@....com, micah.parrish@....com,
	linux-nvdimm@...ts.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/5] block: Add vfs_msg() interface

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@....com>
Cc: Alexander Viro <viro@...iv.linux.org.uk>
Cc: Jens Axboe <axboe@...com>
Cc: "Theodore Ts'o" <tytso@....edu>
Cc: Andreas Dilger <adilger.kernel@...ger.ca>
Cc: Jan Kara <jack@...e.cz>
Cc: Dave Chinner <david@...morbit.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc: Christoph Hellwig <hch@...radead.org>
Cc: Boaz Harrosh <boaz@...xistor.com>
---
 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);