lkml.org 
[lkml]   [2017]   [May]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Subject[PATCH] dax, xfs, ext4: compile out iomap-dax paths in the FS_DAX=n case
From
Date
Tetsuo reports:

fs/built-in.o: In function `xfs_file_iomap_end':
xfs_iomap.c:(.text+0xe0ef9): undefined reference to `put_dax'
fs/built-in.o: In function `xfs_file_iomap_begin':
xfs_iomap.c:(.text+0xe1a7f): undefined reference to `dax_get_by_host'
make: *** [vmlinux] Error 1
$ grep DAX .config
CONFIG_DAX=m
# CONFIG_DEV_DAX is not set
# CONFIG_FS_DAX is not set

When FS_DAX=n we can/must throw away the dax code in filesystems.
Implement 'fs_' versions of dax_get_by_host() and put_dax() that are
nops in the FS_DAX=n case.

Cc: <linux-xfs@vger.kernel.org>
Cc: <linux-ext4@vger.kernel.org>
Cc: Jan Kara <jack@suse.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Ross Zwisler <ross.zwisler@linux.intel.com>
Fixes: ef51042472f5 ("block, dax: move 'select DAX' from BLOCK to FS_DAX")
Reported-by: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
fs/ext2/inode.c | 4 ++--
fs/ext4/inode.c | 4 ++--
fs/xfs/xfs_iomap.c | 4 ++--
include/linux/dax.h | 34 +++++++++++++++++++++++++++-------
4 files changed, 33 insertions(+), 13 deletions(-)

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 26d77f9f8c12..2dcbd5698884 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -817,7 +817,7 @@ static int ext2_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
iomap->bdev = bdev;
iomap->offset = (u64)first_block << blkbits;
if (blk_queue_dax(bdev->bd_queue))
- iomap->dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+ iomap->dax_dev = fs_dax_get_by_host(bdev->bd_disk->disk_name);
else
iomap->dax_dev = NULL;

@@ -841,7 +841,7 @@ static int
ext2_iomap_end(struct inode *inode, loff_t offset, loff_t length,
ssize_t written, unsigned flags, struct iomap *iomap)
{
- put_dax(iomap->dax_dev);
+ fs_put_dax(iomap->dax_dev);
if (iomap->type == IOMAP_MAPPED &&
written < length &&
(flags & IOMAP_WRITE))
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5834c4d76be8..1bd0bfa547f6 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3412,7 +3412,7 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
bdev = inode->i_sb->s_bdev;
iomap->bdev = bdev;
if (blk_queue_dax(bdev->bd_queue))
- iomap->dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+ iomap->dax_dev = fs_dax_get_by_host(bdev->bd_disk->disk_name);
else
iomap->dax_dev = NULL;
iomap->offset = first_block << blkbits;
@@ -3447,7 +3447,7 @@ static int ext4_iomap_end(struct inode *inode, loff_t offset, loff_t length,
int blkbits = inode->i_blkbits;
bool truncate = false;

- put_dax(iomap->dax_dev);
+ fs_put_dax(iomap->dax_dev);
if (!(flags & IOMAP_WRITE) || (flags & IOMAP_FAULT))
return 0;

diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index a63f61c256bd..94e5bdf7304c 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -1068,7 +1068,7 @@ xfs_file_iomap_begin(
/* optionally associate a dax device with the iomap bdev */
bdev = iomap->bdev;
if (blk_queue_dax(bdev->bd_queue))
- iomap->dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
+ iomap->dax_dev = fs_dax_get_by_host(bdev->bd_disk->disk_name);
else
iomap->dax_dev = NULL;

@@ -1149,7 +1149,7 @@ xfs_file_iomap_end(
unsigned flags,
struct iomap *iomap)
{
- put_dax(iomap->dax_dev);
+ fs_put_dax(iomap->dax_dev);
if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC)
return xfs_file_iomap_end_delalloc(XFS_I(inode), offset,
length, written, iomap);
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 00ebac854bb7..5ec1f6c47716 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -18,6 +18,20 @@ struct dax_operations {
void **, pfn_t *);
};

+#if IS_ENABLED(CONFIG_DAX)
+struct dax_device *dax_get_by_host(const char *host);
+void put_dax(struct dax_device *dax_dev);
+#else
+static inline struct dax_device *dax_get_by_host(const char *host)
+{
+ return NULL;
+}
+
+static inline void put_dax(struct dax_device *dax_dev)
+{
+}
+#endif
+
int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
#if IS_ENABLED(CONFIG_FS_DAX)
int __bdev_dax_supported(struct super_block *sb, int blocksize);
@@ -25,23 +39,29 @@ static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
{
return __bdev_dax_supported(sb, blocksize);
}
+
+static inline struct dax_device *fs_dax_get_by_host(const char *host)
+{
+ return dax_get_by_host(host);
+}
+
+static inline void fs_put_dax(struct dax_device *dax_dev)
+{
+ put_dax(dax_dev);
+}
+
#else
static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
{
return -EOPNOTSUPP;
}
-#endif

-#if IS_ENABLED(CONFIG_DAX)
-struct dax_device *dax_get_by_host(const char *host);
-void put_dax(struct dax_device *dax_dev);
-#else
-static inline struct dax_device *dax_get_by_host(const char *host)
+static inline struct dax_device *fs_dax_get_by_host(const char *host)
{
return NULL;
}

-static inline void put_dax(struct dax_device *dax_dev)
+static inline void fs_put_dax(struct dax_device *dax_dev)
{
}
#endif
\
 
 \ /
  Last update: 2017-05-14 02:59    [W:2.966 / U:0.000 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site