From: Vivek Goyal <vgoyal@redhat.com> To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-nvdimm@lists.01.org Cc: swhiteho@redhat.com, dgilbert@redhat.com, stefanha@redhat.com, miklos@szeredi.hu Subject: [PATCH v2 12/30] dax: remove block device dependencies Date: Wed, 15 May 2019 15:26:57 -0400 [thread overview] Message-ID: <20190515192715.18000-13-vgoyal@redhat.com> (raw) In-Reply-To: <20190515192715.18000-1-vgoyal@redhat.com> From: Stefan Hajnoczi <stefanha@redhat.com> Although struct dax_device itself is not tied to a block device, some DAX code assumes there is a block device. Make block devices optional by allowing bdev to be NULL in commonly used DAX APIs. When there is no block device: * Skip the partition offset calculation in bdev_dax_pgoff() * Skip the blkdev_issue_zeroout() optimization Note that more block device assumptions remain but I haven't reach those code paths yet. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- drivers/dax/super.c | 3 ++- fs/dax.c | 7 ++++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 0a339b85133e..cb44ec663991 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -53,7 +53,8 @@ EXPORT_SYMBOL_GPL(dax_read_unlock); int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, pgoff_t *pgoff) { - phys_addr_t phys_off = (get_start_sect(bdev) + sector) * 512; + sector_t start_sect = bdev ? get_start_sect(bdev) : 0; + phys_addr_t phys_off = (start_sect + sector) * 512; if (pgoff) *pgoff = PHYS_PFN(phys_off); diff --git a/fs/dax.c b/fs/dax.c index e5e54da1715f..815bc32fd967 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1042,7 +1042,12 @@ static vm_fault_t dax_load_hole(struct xa_state *xas, static bool dax_range_is_aligned(struct block_device *bdev, unsigned int offset, unsigned int length) { - unsigned short sector_size = bdev_logical_block_size(bdev); + unsigned short sector_size; + + if (!bdev) + return false; + + sector_size = bdev_logical_block_size(bdev); if (!IS_ALIGNED(offset, sector_size)) return false; -- 2.20.1 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm
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From: Vivek Goyal <vgoyal@redhat.com> To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-nvdimm@lists.01.org Cc: vgoyal@redhat.com, miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, swhiteho@redhat.com Subject: [PATCH v2 12/30] dax: remove block device dependencies Date: Wed, 15 May 2019 15:26:57 -0400 [thread overview] Message-ID: <20190515192715.18000-13-vgoyal@redhat.com> (raw) In-Reply-To: <20190515192715.18000-1-vgoyal@redhat.com> From: Stefan Hajnoczi <stefanha@redhat.com> Although struct dax_device itself is not tied to a block device, some DAX code assumes there is a block device. Make block devices optional by allowing bdev to be NULL in commonly used DAX APIs. When there is no block device: * Skip the partition offset calculation in bdev_dax_pgoff() * Skip the blkdev_issue_zeroout() optimization Note that more block device assumptions remain but I haven't reach those code paths yet. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- drivers/dax/super.c | 3 ++- fs/dax.c | 7 ++++++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 0a339b85133e..cb44ec663991 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -53,7 +53,8 @@ EXPORT_SYMBOL_GPL(dax_read_unlock); int bdev_dax_pgoff(struct block_device *bdev, sector_t sector, size_t size, pgoff_t *pgoff) { - phys_addr_t phys_off = (get_start_sect(bdev) + sector) * 512; + sector_t start_sect = bdev ? get_start_sect(bdev) : 0; + phys_addr_t phys_off = (start_sect + sector) * 512; if (pgoff) *pgoff = PHYS_PFN(phys_off); diff --git a/fs/dax.c b/fs/dax.c index e5e54da1715f..815bc32fd967 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -1042,7 +1042,12 @@ static vm_fault_t dax_load_hole(struct xa_state *xas, static bool dax_range_is_aligned(struct block_device *bdev, unsigned int offset, unsigned int length) { - unsigned short sector_size = bdev_logical_block_size(bdev); + unsigned short sector_size; + + if (!bdev) + return false; + + sector_size = bdev_logical_block_size(bdev); if (!IS_ALIGNED(offset, sector_size)) return false; -- 2.20.1
next prev parent reply other threads:[~2019-05-15 19:27 UTC|newest] Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-05-15 19:26 [PATCH v2 00/30] [RFC] virtio-fs: shared file system for virtual machines Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 01/30] fuse: delete dentry if timeout is zero Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 02/30] fuse: Clear setuid bit even in cache=never path Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-20 14:41 ` Miklos Szeredi 2019-05-20 14:41 ` Miklos Szeredi 2019-05-20 14:44 ` Miklos Szeredi 2019-05-20 14:44 ` Miklos Szeredi 2019-05-20 20:25 ` Nikolaus Rath 2019-05-20 20:25 ` Nikolaus Rath 2019-05-21 15:01 ` Vivek Goyal 2019-05-21 15:01 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 03/30] fuse: Use default_file_splice_read for direct IO Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 04/30] fuse: export fuse_end_request() Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 05/30] fuse: export fuse_len_args() Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 06/30] fuse: Export fuse_send_init_request() Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 07/30] fuse: export fuse_get_unique() Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 08/30] fuse: extract fuse_fill_super_common() Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 09/30] fuse: add fuse_iqueue_ops callbacks Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 10/30] fuse: Separate fuse device allocation and installation in fuse_conn Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 11/30] virtio_fs: add skeleton virtio_fs.ko module Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal [this message] 2019-05-15 19:26 ` [PATCH v2 12/30] dax: remove block device dependencies Vivek Goyal 2019-05-16 0:21 ` Dan Williams 2019-05-16 0:21 ` Dan Williams 2019-05-16 10:07 ` Stefan Hajnoczi 2019-05-16 14:23 ` Vivek Goyal 2019-05-16 14:23 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 13/30] dax: Pass dax_dev to dax_writeback_mapping_range() Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:26 ` [PATCH v2 14/30] virtio: Add get_shm_region method Vivek Goyal 2019-05-15 19:26 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 15/30] virtio: Implement get_shm_region for PCI transport Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 16/30] virtio: Implement get_shm_region for MMIO transport Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 17/30] fuse, dax: add fuse_conn->dax_dev field Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 18/30] virtio_fs, dax: Set up virtio_fs dax_device Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-07-17 17:27 ` Halil Pasic 2019-07-17 17:27 ` Halil Pasic 2019-07-18 9:04 ` Cornelia Huck 2019-07-18 9:04 ` Cornelia Huck 2019-07-18 11:20 ` Halil Pasic 2019-07-18 11:20 ` Halil Pasic 2019-07-18 14:47 ` Cornelia Huck 2019-07-18 14:47 ` Cornelia Huck 2019-07-18 13:15 ` Vivek Goyal 2019-07-18 13:15 ` Vivek Goyal 2019-07-18 14:30 ` Dan Williams 2019-07-18 14:30 ` Dan Williams 2019-07-22 10:51 ` Christian Borntraeger 2019-07-22 10:51 ` Christian Borntraeger 2019-07-22 10:56 ` Dr. David Alan Gilbert 2019-07-22 10:56 ` Dr. David Alan Gilbert 2019-07-22 11:20 ` Christian Borntraeger 2019-07-22 11:20 ` Christian Borntraeger 2019-07-22 11:43 ` Cornelia Huck 2019-07-22 11:43 ` Cornelia Huck 2019-07-22 12:00 ` Christian Borntraeger 2019-07-22 12:00 ` Christian Borntraeger 2019-07-22 12:08 ` David Hildenbrand 2019-07-22 12:08 ` David Hildenbrand 2019-07-29 13:20 ` Stefan Hajnoczi 2019-05-15 19:27 ` [PATCH v2 19/30] fuse: Keep a list of free dax memory ranges Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 20/30] fuse: Introduce setupmapping/removemapping commands Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 21/30] fuse, dax: Implement dax read/write operations Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 22/30] fuse, dax: add DAX mmap support Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 23/30] fuse: Define dax address space operations Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 24/30] fuse, dax: Take ->i_mmap_sem lock during dax page fault Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 25/30] fuse: Maintain a list of busy elements Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 26/30] fuse: Add logic to free up a memory range Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-19 7:48 ` Eric Ren 2019-05-20 12:53 ` Vivek Goyal 2019-05-20 12:53 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 27/30] fuse: Release file in process context Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 28/30] fuse: Reschedule dax free work if too many EAGAIN attempts Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 29/30] fuse: Take inode lock for dax inode truncation Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal 2019-05-15 19:27 ` [PATCH v2 30/30] virtio-fs: Do not provide abort interface in fusectl Vivek Goyal 2019-05-15 19:27 ` Vivek Goyal
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