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Date: Mon, 19 Oct 2020 16:48:46 +0200
From: Miklos Szeredi <miklos@...redi.hu>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [GIT PULL] fuse update for 5.10
Hi Linus,
Please pull from:
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse.git tags/fuse-update-5.10
- Support directly accessing host page cache from virtiofs. This can
improve I/O performance for various workloads, as well as reducing the
memory requirement by eliminating double caching. Thanks to Vivek Goyal
for doing most of the work on this.
- Allow automatic submounting inside virtiofs. This allows unique st_dev/
st_ino values to be assigned inside the guest to files residing on
different filesystems on the host. Thanks to Max Reitz for the patches.
- Fix an old use after free bug found by Pradeep P V K.
*Merge notes*
This tree acquired two merge conflicts against mainline:
1) a trivial one in fs/fuse/file.c: keep HEAD and s/ff->fc/ff->fm->fc/
2) a semantic conflict in fs/fuse/virtio_fs.c against commit a4574f63edc6
("mm/memremap_pages: convert to 'struct range'") and commit b7b3c01b1915
("mm/memremap_pages: support multiple ranges per invocation"):
- s/pgmap->res/pgmap->range/
- s/struct resource/struct range/
- remove .name assignment
- add "pgmap->nr_range = 1"
Appended my resolution at the end of this mail.
Thanks,
Miklos
---
André Almeida (1):
fuse: update project homepage
Max Reitz (6):
fuse: add submount support to <uapi/linux/fuse.h>
fuse: store fuse_conn in fuse_req
fuse: drop fuse_conn parameter where possible
fuse: split fuse_mount off of fuse_conn
fuse: Allow fuse_fill_super_common() for submounts
fuse: implement crossmounts
Miklos Szeredi (2):
fuse: fix page dereference after free
fuse: connection remove fix
Sebastien Boeuf (3):
virtio: Add get_shm_region method
virtio: Implement get_shm_region for PCI transport
virtio: Implement get_shm_region for MMIO transport
Stefan Hajnoczi (3):
virtiofs: set up virtio_fs dax_device
virtiofs: implement FUSE_INIT map_alignment field
virtiofs: add DAX mmap support
Vivek Goyal (13):
dax: Modify bdev_dax_pgoff() to handle NULL bdev
dax: Create a range version of dax_layout_busy_page()
virtiofs: provide a helper function for virtqueue initialization
virtiofs: get rid of no_mount_options
virtiofs: add a mount option to enable dax
virtiofs: keep a list of free dax memory ranges
virtiofs: introduce setupmapping/removemapping commands
virtiofs: implement dax read/write operations
virtiofs: define dax address space operations
virtiofs: serialize truncate/punch_hole and dax fault path
virtiofs: maintain a list of busy elements
virtiofs: add logic to free up a memory range
virtiofs: calculate number of scatter-gather elements accurately
---
Documentation/filesystems/fuse.rst | 2 +-
MAINTAINERS | 2 +-
drivers/dax/super.c | 3 +-
drivers/virtio/virtio_mmio.c | 31 +
drivers/virtio/virtio_pci_modern.c | 95 +++
fs/dax.c | 29 +-
fs/fuse/Kconfig | 16 +-
fs/fuse/Makefile | 6 +-
fs/fuse/control.c | 20 +-
fs/fuse/cuse.c | 21 +-
fs/fuse/dax.c | 1365 ++++++++++++++++++++++++++++++++++++
fs/fuse/dev.c | 189 ++---
fs/fuse/dir.c | 220 ++++--
fs/fuse/file.c | 256 ++++---
fs/fuse/fuse_i.h | 185 ++++-
fs/fuse/inode.c | 391 ++++++++---
fs/fuse/readdir.c | 10 +-
fs/fuse/virtio_fs.c | 378 ++++++++--
fs/fuse/xattr.c | 34 +-
include/linux/dax.h | 6 +
include/linux/virtio_config.h | 17 +
include/uapi/linux/fuse.h | 50 +-
include/uapi/linux/virtio_fs.h | 3 +
include/uapi/linux/virtio_mmio.h | 11 +
include/uapi/linux/virtio_pci.h | 11 +-
25 files changed, 2854 insertions(+), 497 deletions(-)
create mode 100644 fs/fuse/dax.c
---
diff --cc fs/fuse/file.c
index 43c165e796da,53d4dd1ab992..c03034e8c152
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@@ -3120,17 -3156,10 +3146,17 @@@ fuse_direct_IO(struct kiocb *iocb, stru
* By default, we want to optimize all I/Os with async request
* submission to the client filesystem if supported.
*/
- io->async = ff->fc->async_dio;
- io->async = async_dio;
++ io->async = ff->fm->fc->async_dio;
io->iocb = iocb;
io->blocking = is_sync_kiocb(iocb);
+ /* optimization for short read */
+ if (io->async && !io->write && offset + count > i_size) {
- iov_iter_truncate(iter, fuse_round_up(ff->fc, i_size - offset));
++ iov_iter_truncate(iter, fuse_round_up(ff->fm->fc, i_size - offset));
+ shortened = count - iov_iter_count(iter);
+ count -= shortened;
+ }
+
/*
* We cannot asynchronously extend the size of a file.
* In such case the aio will behave exactly like sync io.
diff --cc fs/fuse/virtio_fs.c
index 104f35de5270,f9c1aa1d289c..21a9e534417c
--- a/fs/fuse/virtio_fs.c
+++ b/fs/fuse/virtio_fs.c
@@@ -676,6 -733,130 +733,130 @@@ static void virtio_fs_cleanup_vqs(struc
vdev->config->del_vqs(vdev);
}
+ /* Map a window offset to a page frame number. The window offset will have
+ * been produced by .iomap_begin(), which maps a file offset to a window
+ * offset.
+ */
+ static long virtio_fs_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
+ long nr_pages, void **kaddr, pfn_t *pfn)
+ {
+ struct virtio_fs *fs = dax_get_private(dax_dev);
+ phys_addr_t offset = PFN_PHYS(pgoff);
+ size_t max_nr_pages = fs->window_len/PAGE_SIZE - pgoff;
+
+ if (kaddr)
+ *kaddr = fs->window_kaddr + offset;
+ if (pfn)
+ *pfn = phys_to_pfn_t(fs->window_phys_addr + offset,
+ PFN_DEV | PFN_MAP);
+ return nr_pages > max_nr_pages ? max_nr_pages : nr_pages;
+ }
+
+ static size_t virtio_fs_copy_from_iter(struct dax_device *dax_dev,
+ pgoff_t pgoff, void *addr,
+ size_t bytes, struct iov_iter *i)
+ {
+ return copy_from_iter(addr, bytes, i);
+ }
+
+ static size_t virtio_fs_copy_to_iter(struct dax_device *dax_dev,
+ pgoff_t pgoff, void *addr,
+ size_t bytes, struct iov_iter *i)
+ {
+ return copy_to_iter(addr, bytes, i);
+ }
+
+ static int virtio_fs_zero_page_range(struct dax_device *dax_dev,
+ pgoff_t pgoff, size_t nr_pages)
+ {
+ long rc;
+ void *kaddr;
+
+ rc = dax_direct_access(dax_dev, pgoff, nr_pages, &kaddr, NULL);
+ if (rc < 0)
+ return rc;
+ memset(kaddr, 0, nr_pages << PAGE_SHIFT);
+ dax_flush(dax_dev, kaddr, nr_pages << PAGE_SHIFT);
+ return 0;
+ }
+
+ static const struct dax_operations virtio_fs_dax_ops = {
+ .direct_access = virtio_fs_direct_access,
+ .copy_from_iter = virtio_fs_copy_from_iter,
+ .copy_to_iter = virtio_fs_copy_to_iter,
+ .zero_page_range = virtio_fs_zero_page_range,
+ };
+
+ static void virtio_fs_cleanup_dax(void *data)
+ {
+ struct dax_device *dax_dev = data;
+
+ kill_dax(dax_dev);
+ put_dax(dax_dev);
+ }
+
+ static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs)
+ {
+ struct virtio_shm_region cache_reg;
+ struct dev_pagemap *pgmap;
+ bool have_cache;
+
+ if (!IS_ENABLED(CONFIG_FUSE_DAX))
+ return 0;
+
+ /* Get cache region */
+ have_cache = virtio_get_shm_region(vdev, &cache_reg,
+ (u8)VIRTIO_FS_SHMCAP_ID_CACHE);
+ if (!have_cache) {
+ dev_notice(&vdev->dev, "%s: No cache capability\n", __func__);
+ return 0;
+ }
+
+ if (!devm_request_mem_region(&vdev->dev, cache_reg.addr, cache_reg.len,
+ dev_name(&vdev->dev))) {
+ dev_warn(&vdev->dev, "could not reserve region addr=0x%llx len=0x%llx\n",
+ cache_reg.addr, cache_reg.len);
+ return -EBUSY;
+ }
+
+ dev_notice(&vdev->dev, "Cache len: 0x%llx @ 0x%llx\n", cache_reg.len,
+ cache_reg.addr);
+
+ pgmap = devm_kzalloc(&vdev->dev, sizeof(*pgmap), GFP_KERNEL);
+ if (!pgmap)
+ return -ENOMEM;
+
+ pgmap->type = MEMORY_DEVICE_FS_DAX;
+
+ /* Ideally we would directly use the PCI BAR resource but
+ * devm_memremap_pages() wants its own copy in pgmap. So
+ * initialize a struct resource from scratch (only the start
+ * and end fields will be used).
+ */
- pgmap->res = (struct resource){
- .name = "virtio-fs dax window",
++ pgmap->range = (struct range) {
+ .start = (phys_addr_t) cache_reg.addr,
+ .end = (phys_addr_t) cache_reg.addr + cache_reg.len - 1,
+ };
++ pgmap->nr_range = 1;
+
+ fs->window_kaddr = devm_memremap_pages(&vdev->dev, pgmap);
+ if (IS_ERR(fs->window_kaddr))
+ return PTR_ERR(fs->window_kaddr);
+
+ fs->window_phys_addr = (phys_addr_t) cache_reg.addr;
+ fs->window_len = (phys_addr_t) cache_reg.len;
+
+ dev_dbg(&vdev->dev, "%s: window kaddr 0x%px phys_addr 0x%llx len 0x%llx\n",
+ __func__, fs->window_kaddr, cache_reg.addr, cache_reg.len);
+
+ fs->dax_dev = alloc_dax(fs, NULL, &virtio_fs_dax_ops, 0);
+ if (IS_ERR(fs->dax_dev))
+ return PTR_ERR(fs->dax_dev);
+
+ return devm_add_action_or_reset(&vdev->dev, virtio_fs_cleanup_dax,
+ fs->dax_dev);
+ }
+
static int virtio_fs_probe(struct virtio_device *vdev)
{
struct virtio_fs *fs;
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