[PATCH v8 7/9] dax: add dax holder helper for filesystems
From: Shiyang Ruan <hidden>
Date: 2021-12-02 08:49:26
Also in:
linux-fsdevel, linux-xfs, lkml, nvdimm
Subsystem:
device direct access (dax), filesystem direct access (dax), the rest · Maintainers:
Dan Williams, Vishal Verma, Dave Jiang, Alison Schofield, Linus Torvalds
Add these helper functions, and export them for filesystem use. Signed-off-by: Shiyang Ruan <redacted> --- drivers/dax/super.c | 19 +++++++++++++++++++ include/linux/dax.h | 15 +++++++++++++++ 2 files changed, 34 insertions(+)
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index a19fcc0a54f3..acbe7078ce4c 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c@@ -114,6 +114,25 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev, u64 *start_off) return dax_dev; } EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); + +void fs_dax_register_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops) +{ + dax_set_holder(dax_dev, holder, ops); +} +EXPORT_SYMBOL_GPL(fs_dax_register_holder); + +void fs_dax_unregister_holder(struct dax_device *dax_dev) +{ + dax_set_holder(dax_dev, NULL, NULL); +} +EXPORT_SYMBOL_GPL(fs_dax_unregister_holder); + +void *fs_dax_get_holder(struct dax_device *dax_dev) +{ + return dax_get_holder(dax_dev); +} +EXPORT_SYMBOL_GPL(fs_dax_get_holder); #endif /* CONFIG_BLOCK && CONFIG_FS_DAX */ enum dax_device_flags {
diff --git a/include/linux/dax.h b/include/linux/dax.h
index 500d048d444e..15a0ad4c248d 100644
--- a/include/linux/dax.h
+++ b/include/linux/dax.h@@ -140,6 +140,10 @@ static inline void fs_put_dax(struct dax_device *dax_dev) { put_dax(dax_dev); } +void fs_dax_register_holder(struct dax_device *dax_dev, void *holder, + const struct dax_holder_operations *ops); +void fs_dax_unregister_holder(struct dax_device *dax_dev); +void *fs_dax_get_holder(struct dax_device *dax_dev); #else static inline int dax_add_host(struct dax_device *dax_dev, struct gendisk *disk) {
@@ -156,6 +160,17 @@ static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev, static inline void fs_put_dax(struct dax_device *dax_dev) { } +static inline void fs_dax_register_holder(struct dax_device *dax_dev, + void *holder, const struct dax_holder_operations *ops) +{ +} +static inline void fs_dax_unregister_holder(struct dax_device *dax_dev) +{ +} +static inline void *fs_dax_get_holder(struct dax_device *dax_dev) +{ + return NULL; +} #endif /* CONFIG_BLOCK && CONFIG_FS_DAX */ #if IS_ENABLED(CONFIG_FS_DAX)
--
2.34.0