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Fri, 22 Sep 2017 17:32:01 +0000 (UTC) X-Virus-Scanned: ClamAV using ClamSMTP Change device-mapper's 'select DAX' dependency to be dependent on the presence of at least one DAX_DRIVER. This allows device-mapper to be built without bringing the DAX core along which is especially wasteful when there are no DAX drivers, like BLK_DEV_PMEM, configured. Cc: Alasdair Kergon Cc: Mike Snitzer Reported-by: Bart Van Assche Reported-by: kbuild test robot Signed-off-by: Dan Williams --- drivers/md/Kconfig | 2 +- drivers/md/dm-linear.c | 6 ++++++ drivers/md/dm-stripe.c | 6 ++++++ drivers/md/dm.c | 10 ++++++---- include/linux/dax.h | 30 ++++++++++++++++++++++++------ 5 files changed, 43 insertions(+), 11 deletions(-) -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel diff --git a/drivers/md/Kconfig b/drivers/md/Kconfig index 4a249ee86364..baeea31dc858 100644 --- a/drivers/md/Kconfig +++ b/drivers/md/Kconfig @@ -200,7 +200,7 @@ config BLK_DEV_DM_BUILTIN config BLK_DEV_DM tristate "Device mapper support" select BLK_DEV_DM_BUILTIN - select DAX + select DAX if DAX_DRIVER ---help--- Device-mapper is a low level volume manager. It works by allowing people to specify mappings for ranges of logical sectors. Various diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index d5f8eff7c11d..df4b6f0489aa 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -154,6 +154,7 @@ static int linear_iterate_devices(struct dm_target *ti, return fn(ti, lc->dev, lc->start, ti->len, data); } +#if IS_ENABLED(CONFIG_DAX) static long linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) { @@ -184,6 +185,11 @@ static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); } +#else +#define linear_dax_direct_access NULL +#define linear_dax_copy_from_iter NULL +#endif + static struct target_type linear_target = { .name = "linear", .version = {1, 4, 0}, diff --git a/drivers/md/dm-stripe.c b/drivers/md/dm-stripe.c index b5e892149c54..8cb98ee2c9db 100644 --- a/drivers/md/dm-stripe.c +++ b/drivers/md/dm-stripe.c @@ -311,6 +311,7 @@ static int stripe_map(struct dm_target *ti, struct bio *bio) return DM_MAPIO_REMAPPED; } +#if IS_ENABLED(CONFIG_DAX) static long stripe_dax_direct_access(struct dm_target *ti, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) { @@ -351,6 +352,11 @@ static size_t stripe_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); } +#else +#define stripe_dax_direct_access NULL +#define stripe_dax_copy_from_iter NULL +#endif + /* * Stripe status: * diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 6e54145969c5..e364c584a676 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1685,7 +1685,7 @@ static void cleanup_mapped_device(struct mapped_device *md) static struct mapped_device *alloc_dev(int minor) { int r, numa_node_id = dm_get_numa_node(); - struct dax_device *dax_dev; + struct dax_device *dax_dev = NULL; struct mapped_device *md; void *old_md; @@ -1751,9 +1751,11 @@ static struct mapped_device *alloc_dev(int minor) md->disk->private_data = md; sprintf(md->disk->disk_name, "dm-%d", minor); - dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops); - if (!dax_dev) - goto bad; + if (IS_ENABLED(CONFIG_DAX)) { + dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops); + if (!dax_dev) + goto bad; + } md->dax_dev = dax_dev; add_disk(md->disk); diff --git a/include/linux/dax.h b/include/linux/dax.h index 122197124b9d..898403da0458 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -25,16 +25,39 @@ extern struct attribute_group dax_attribute_group; #if IS_ENABLED(CONFIG_DAX) struct dax_device *dax_get_by_host(const char *host); +struct dax_device *alloc_dax(void *private, const char *host, + const struct dax_operations *ops); void put_dax(struct dax_device *dax_dev); +void kill_dax(struct dax_device *dax_dev); +void dax_write_cache(struct dax_device *dax_dev, bool wc); +bool dax_write_cache_enabled(struct dax_device *dax_dev); #else static inline struct dax_device *dax_get_by_host(const char *host) { return NULL; } - +static inline struct dax_device *alloc_dax(void *private, const char *host, + const struct dax_operations *ops) +{ + /* + * Callers should check IS_ENABLED(CONFIG_DAX) to know if this + * NULL is an error or expected. + */ + return NULL; +} static inline void put_dax(struct dax_device *dax_dev) { } +static inline void kill_dax(struct dax_device *dax_dev) +{ +} +static inline void dax_write_cache(struct dax_device *dax_dev, bool wc) +{ +} +static inline bool dax_write_cache_enabled(struct dax_device *dax_dev) +{ + return false; +} #endif int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff); @@ -79,18 +102,13 @@ static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) int dax_read_lock(void); void dax_read_unlock(int id); -struct dax_device *alloc_dax(void *private, const char *host, - const struct dax_operations *ops); bool dax_alive(struct dax_device *dax_dev); -void kill_dax(struct dax_device *dax_dev); void *dax_get_private(struct dax_device *dax_dev); long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn); size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i); void dax_flush(struct dax_device *dax_dev, void *addr, size_t size); -void dax_write_cache(struct dax_device *dax_dev, bool wc); -bool dax_write_cache_enabled(struct dax_device *dax_dev); ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, const struct iomap_ops *ops);