From ba23cba9b3bdc967aabdc6ff1e3e9b11ce05bb4f Mon Sep 17 00:00:00 2001 From: "Darrick J. Wong" Date: Wed, 30 May 2018 13:03:45 -0700 Subject: fs: allow per-device dax status checking for filesystems Change bdev_dax_supported so it 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 [rez: Re-added __bdev_dax_supported() for !CONFIG_FS_DAX cases] Signed-off-by: Ross Zwisler Reviewed-by: Eric Sandeen --- drivers/dax/super.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) (limited to 'drivers') diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 2b2332b605e4..3943feb9a090 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -74,7 +74,7 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); /** * __bdev_dax_supported() - Check if the device supports dax for filesystem - * @sb: The superblock of the device + * @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; } @@ -137,8 +137,8 @@ int __bdev_dax_supported(struct super_block *sb, int blocksize) } else if (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; } -- cgit v1.2.3-59-g8ed1b From 80660f20252d6f76c9f203874ad7c7a4a8508cf8 Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Wed, 30 May 2018 13:03:46 -0700 Subject: dax: change bdev_dax_supported() to support boolean returns The function return values are confusing with the way the function is named. We expect a true or false return value but it actually returns 0/-errno. This makes the code very confusing. Changing the return values to return a bool where if DAX is supported then return true and no DAX support returns false. Signed-off-by: Dave Jiang Signed-off-by: Ross Zwisler Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- drivers/dax/super.c | 16 ++++++++-------- fs/ext2/super.c | 3 +-- fs/ext4/super.c | 3 +-- fs/xfs/xfs_ioctl.c | 4 ++-- fs/xfs/xfs_super.c | 12 ++++++------ include/linux/dax.h | 8 ++++---- 6 files changed, 22 insertions(+), 24 deletions(-) (limited to 'drivers') diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 3943feb9a090..1d7bd96511f0 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -80,9 +80,9 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); * This is a library function for filesystems to check if the block device * can be mounted with dax option. * - * Return: negative errno if unsupported, 0 if supported. + * Return: true if supported, false if unsupported */ -int __bdev_dax_supported(struct block_device *bdev, int blocksize) +bool __bdev_dax_supported(struct block_device *bdev, int blocksize) { struct dax_device *dax_dev; pgoff_t pgoff; @@ -95,21 +95,21 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize) if (blocksize != PAGE_SIZE) { pr_debug("%s: error: unsupported blocksize for dax\n", bdevname(bdev, buf)); - return -EINVAL; + return false; } err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff); if (err) { pr_debug("%s: error: unaligned partition for dax\n", bdevname(bdev, buf)); - return err; + return false; } dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); if (!dax_dev) { pr_debug("%s: error: device does not support dax\n", bdevname(bdev, buf)); - return -EOPNOTSUPP; + return false; } id = dax_read_lock(); @@ -121,7 +121,7 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize) if (len < 1) { pr_debug("%s: error: dax access failed (%ld)\n", bdevname(bdev, buf), len); - return len < 0 ? len : -EIO; + return false; } if (IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) { @@ -139,10 +139,10 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize) } else { pr_debug("%s: error: dax support not enabled\n", bdevname(bdev, buf)); - return -EOPNOTSUPP; + return false; } - return 0; + return true; } EXPORT_SYMBOL_GPL(__bdev_dax_supported); #endif diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 9627c3054b5c..c09289a42dc5 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -961,8 +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->s_bdev, blocksize); - if (err) { + if (!bdev_dax_supported(sb->s_bdev, blocksize)) { ext2_msg(sb, KERN_ERR, "DAX unsupported by block device. Turning off DAX."); sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 089170e99895..2e1622907f4a 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3732,8 +3732,7 @@ 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->s_bdev, blocksize); - if (err) { + if (!bdev_dax_supported(sb->s_bdev, blocksize)) { ext4_msg(sb, KERN_ERR, "DAX unsupported by block device. Turning off DAX."); sbi->s_mount_opt &= ~EXT4_MOUNT_DAX; diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c index c9a5b75a73a8..5dd9e22b4a4c 100644 --- a/fs/xfs/xfs_ioctl.c +++ b/fs/xfs/xfs_ioctl.c @@ -1103,8 +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(xfs_find_bdev_for_inode(VFS_I(ip)), - sb->s_blocksize) < 0) + if (!bdev_dax_supported(xfs_find_bdev_for_inode(VFS_I(ip)), + sb->s_blocksize)) return -EINVAL; } diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index fed63e0b8f4d..4e66e61865fb 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1701,17 +1701,17 @@ xfs_fs_fill_super( sb->s_flags |= SB_I_VERSION; if (mp->m_flags & XFS_MOUNT_DAX) { - int error2 = 0; + bool rtdev_is_dax = false, datadev_is_dax; xfs_warn(mp, "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); - error = bdev_dax_supported(mp->m_ddev_targp->bt_bdev, - sb->s_blocksize); + datadev_is_dax = 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) { + rtdev_is_dax = bdev_dax_supported( + mp->m_rtdev_targp->bt_bdev, sb->s_blocksize); + if (!rtdev_is_dax && !datadev_is_dax) { 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 2a4f7295c12b..c99692ddd4b5 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -64,8 +64,8 @@ static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) struct writeback_control; 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 block_device *bdev, int blocksize); -static inline int bdev_dax_supported(struct block_device *bdev, int blocksize) +bool __bdev_dax_supported(struct block_device *bdev, int blocksize); +static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize) { return __bdev_dax_supported(bdev, blocksize); } @@ -84,10 +84,10 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev); int dax_writeback_mapping_range(struct address_space *mapping, struct block_device *bdev, struct writeback_control *wbc); #else -static inline int bdev_dax_supported(struct block_device *bdev, +static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize) { - return -EOPNOTSUPP; + return false; } static inline struct dax_device *fs_dax_get_by_host(const char *host) -- cgit v1.2.3-59-g8ed1b