From: Darrick J. Wong <[email protected]>
Remove __bdev_dax_supported and change to bdev_dax_supported that takes a
bdev parameter. This enables multi-device filesystems like xfs to check
that a dax device can work for the particular filesystem. Once that's
in place, actually fix all the parts of XFS where we need to be able to
distinguish between datadev and rtdev.
This patch fixes the problem where we screw up the dax support checking
in xfs if the datadev and rtdev have different dax capabilities.
Signed-off-by: Darrick J. Wong <[email protected]>
Signed-off-by: Dave Jiang <[email protected]>
---
drivers/dax/super.c | 30 +++++++++++++++---------------
fs/ext2/super.c | 2 +-
fs/ext4/super.c | 2 +-
fs/xfs/xfs_ioctl.c | 3 ++-
fs/xfs/xfs_iops.c | 30 +++++++++++++++++++++++++-----
fs/xfs/xfs_super.c | 10 ++++++++--
include/linux/dax.h | 10 +++-------
7 files changed, 55 insertions(+), 32 deletions(-)
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 473af694ad1c..f037458600aa 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -73,8 +73,8 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
#endif
/**
- * __bdev_dax_supported() - Check if the device supports dax for filesystem
- * @sb: The superblock of the device
+ * bdev_dax_supported() - Check if the device supports dax for filesystem
+ * @bdev: block device to check
* @blocksize: The block size of the device
*
* This is a library function for filesystems to check if the block device
@@ -82,33 +82,33 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev);
*
* Return: negative errno if unsupported, 0 if supported.
*/
-int __bdev_dax_supported(struct super_block *sb, int blocksize)
+int bdev_dax_supported(struct block_device *bdev, int blocksize)
{
- struct block_device *bdev = sb->s_bdev;
struct dax_device *dax_dev;
pgoff_t pgoff;
int err, id;
void *kaddr;
pfn_t pfn;
long len;
+ char buf[BDEVNAME_SIZE];
if (blocksize != PAGE_SIZE) {
- pr_debug("VFS (%s): error: unsupported blocksize for dax\n",
- sb->s_id);
+ pr_debug("%s: error: unsupported blocksize for dax\n",
+ bdevname(bdev, buf));
return -EINVAL;
}
err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff);
if (err) {
- pr_debug("VFS (%s): error: unaligned partition for dax\n",
- sb->s_id);
+ pr_debug("%s: error: unaligned partition for dax\n",
+ bdevname(bdev, buf));
return err;
}
dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
if (!dax_dev) {
- pr_debug("VFS (%s): error: device does not support dax\n",
- sb->s_id);
+ pr_debug("%s: error: device does not support dax\n",
+ bdevname(bdev, buf));
return -EOPNOTSUPP;
}
@@ -119,8 +119,8 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize)
put_dax(dax_dev);
if (len < 1) {
- pr_debug("VFS (%s): error: dax access failed (%ld)\n",
- sb->s_id, len);
+ pr_debug("%s: error: dax access failed (%ld)\n",
+ bdevname(bdev, buf), len);
return len < 0 ? len : -EIO;
}
@@ -128,14 +128,14 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize)
|| pfn_t_devmap(pfn))
/* pass */;
else {
- pr_debug("VFS (%s): error: dax support not enabled\n",
- sb->s_id);
+ pr_debug("%s: error: dax support not enabled\n",
+ bdevname(bdev, buf));
return -EOPNOTSUPP;
}
return 0;
}
-EXPORT_SYMBOL_GPL(__bdev_dax_supported);
+EXPORT_SYMBOL_GPL(bdev_dax_supported);
#endif
enum dax_device_flags {
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 7666c065b96f..b8063b640ec1 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -961,7 +961,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size);
if (sbi->s_mount_opt & EXT2_MOUNT_DAX) {
- err = bdev_dax_supported(sb, blocksize);
+ err = bdev_dax_supported(sb->s_bdev, blocksize);
if (err) {
ext2_msg(sb, KERN_ERR,
"DAX unsupported by block device. Turning off DAX.");
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 39bf464c35f1..911eca771853 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3714,7 +3714,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
" that may contain inline data");
sbi->s_mount_opt &= ~EXT4_MOUNT_DAX;
}
- err = bdev_dax_supported(sb, blocksize);
+ err = bdev_dax_supported(sb->s_bdev, blocksize);
if (err) {
ext4_msg(sb, KERN_ERR,
"DAX unsupported by block device. Turning off DAX.");
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 89fb1eb80aae..0effd46b965f 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1103,7 +1103,8 @@ xfs_ioctl_setattr_dax_invalidate(
if (fa->fsx_xflags & FS_XFLAG_DAX) {
if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)))
return -EINVAL;
- if (bdev_dax_supported(sb, sb->s_blocksize) < 0)
+ if (bdev_dax_supported(xfs_find_bdev_for_inode(VFS_I(ip)),
+ sb->s_blocksize) < 0)
return -EINVAL;
}
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 56475fcd76f2..66cd61c172af 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -1182,6 +1182,30 @@ static const struct inode_operations xfs_inline_symlink_inode_operations = {
.update_time = xfs_vn_update_time,
};
+/* Figure out if this file actually supports DAX. */
+static bool
+xfs_inode_supports_dax(
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = ip->i_mount;
+
+ /* Only supported on non-reflinked files. */
+ if (!S_ISREG(VFS_I(ip)->i_mode) || xfs_is_reflink_inode(ip))
+ return false;
+
+ /* DAX mount option or DAX iflag must be set. */
+ if (!(mp->m_flags & XFS_MOUNT_DAX) &&
+ !(ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
+ return false;
+
+ /* Block size must match page size */
+ if (mp->m_sb.sb_blocksize != PAGE_SIZE)
+ return false;
+
+ /* Device has to support DAX too. */
+ return xfs_find_daxdev_for_inode(VFS_I(ip)) != NULL;
+}
+
STATIC void
xfs_diflags_to_iflags(
struct inode *inode,
@@ -1200,11 +1224,7 @@ xfs_diflags_to_iflags(
inode->i_flags |= S_SYNC;
if (flags & XFS_DIFLAG_NOATIME)
inode->i_flags |= S_NOATIME;
- if (S_ISREG(inode->i_mode) &&
- ip->i_mount->m_sb.sb_blocksize == PAGE_SIZE &&
- !xfs_is_reflink_inode(ip) &&
- (ip->i_mount->m_flags & XFS_MOUNT_DAX ||
- ip->i_d.di_flags2 & XFS_DIFLAG2_DAX))
+ if (xfs_inode_supports_dax(ip))
inode->i_flags |= S_DAX;
}
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 7aba628dc527..aaaba6e604c4 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1657,11 +1657,17 @@ xfs_fs_fill_super(
sb->s_flags |= SB_I_VERSION;
if (mp->m_flags & XFS_MOUNT_DAX) {
+ int error2 = 0;
+
xfs_warn(mp,
"DAX enabled. Warning: EXPERIMENTAL, use at your own risk");
- error = bdev_dax_supported(sb, sb->s_blocksize);
- if (error) {
+ error = bdev_dax_supported(mp->m_ddev_targp->bt_bdev,
+ sb->s_blocksize);
+ if (mp->m_rtdev_targp)
+ error2 = bdev_dax_supported(mp->m_rtdev_targp->bt_bdev,
+ sb->s_blocksize);
+ if (error && error2) {
xfs_alert(mp,
"DAX unsupported by block device. Turning off DAX.");
mp->m_flags &= ~XFS_MOUNT_DAX;
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 0185ecdae135..8eb3a359df95 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h
@@ -40,12 +40,7 @@ static inline void put_dax(struct dax_device *dax_dev)
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);
-static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
-{
- return __bdev_dax_supported(sb, blocksize);
-}
-
+int bdev_dax_supported(struct block_device *bdev, int blocksize);
static inline struct dax_device *fs_dax_get_by_host(const char *host)
{
return dax_get_by_host(host);
@@ -58,7 +53,8 @@ static inline void fs_put_dax(struct dax_device *dax_dev)
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
#else
-static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
+static inline int bdev_dax_supported(struct block_device *bdev,
+ int blocksize)
{
return -EOPNOTSUPP;
}
Hi Darrick,
I love your patch! Yet something to improve:
[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc1 next-20180216]
[cannot apply to dgc-xfs/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
url: https://github.com/0day-ci/linux/commits/Dave-Jiang/minimal-DAX-support-for-XFS-realtime-device/20180218-152445
config: x86_64-randconfig-x008-201807 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
# save the attached .config to linux build tree
make ARCH=x86_64
All errors (new ones prefixed by >>):
>> drivers//dax/super.c:85:5: error: redefinition of 'bdev_dax_supported'
int bdev_dax_supported(struct block_device *bdev, int blocksize)
^~~~~~~~~~~~~~~~~~
In file included from drivers//dax/super.c:23:0:
include/linux/dax.h:56:19: note: previous definition of 'bdev_dax_supported' was here
static inline int bdev_dax_supported(struct block_device *bdev,
^~~~~~~~~~~~~~~~~~
vim +/bdev_dax_supported +85 drivers//dax/super.c
74
75 /**
76 * bdev_dax_supported() - Check if the device supports dax for filesystem
77 * @bdev: block device to check
78 * @blocksize: The block size of the device
79 *
80 * This is a library function for filesystems to check if the block device
81 * can be mounted with dax option.
82 *
83 * Return: negative errno if unsupported, 0 if supported.
84 */
> 85 int bdev_dax_supported(struct block_device *bdev, int blocksize)
86 {
87 struct dax_device *dax_dev;
88 pgoff_t pgoff;
89 int err, id;
90 void *kaddr;
91 pfn_t pfn;
92 long len;
93 char buf[BDEVNAME_SIZE];
94
95 if (blocksize != PAGE_SIZE) {
96 pr_debug("%s: error: unsupported blocksize for dax\n",
97 bdevname(bdev, buf));
98 return -EINVAL;
99 }
100
101 err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff);
102 if (err) {
103 pr_debug("%s: error: unaligned partition for dax\n",
104 bdevname(bdev, buf));
105 return err;
106 }
107
108 dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
109 if (!dax_dev) {
110 pr_debug("%s: error: device does not support dax\n",
111 bdevname(bdev, buf));
112 return -EOPNOTSUPP;
113 }
114
115 id = dax_read_lock();
116 len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
117 dax_read_unlock(id);
118
119 put_dax(dax_dev);
120
121 if (len < 1) {
122 pr_debug("%s: error: dax access failed (%ld)\n",
123 bdevname(bdev, buf), len);
124 return len < 0 ? len : -EIO;
125 }
126
127 if ((IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn))
128 || pfn_t_devmap(pfn))
129 /* pass */;
130 else {
131 pr_debug("%s: error: dax support not enabled\n",
132 bdevname(bdev, buf));
133 return -EOPNOTSUPP;
134 }
135
136 return 0;
137 }
138 EXPORT_SYMBOL_GPL(bdev_dax_supported);
139 #endif
140
---
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