From: Goldwyn Rodrigues <rgoldwyn@suse.de>
To: linux-btrfs@vger.kernel.org
Cc: Goldwyn Rodrigues <rgoldwyn@suse.com>
Subject: [PATCH 09/10] btrfs: dax support for cow_page/mmap_private and shared
Date: Wed, 5 Dec 2018 06:28:34 -0600 [thread overview]
Message-ID: <20181205122835.19290-10-rgoldwyn@suse.de> (raw)
In-Reply-To: <20181205122835.19290-1-rgoldwyn@suse.de>
From: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
---
fs/btrfs/dax.c | 25 ++++++++++++++++++++-----
1 file changed, 20 insertions(+), 5 deletions(-)
diff --git a/fs/btrfs/dax.c b/fs/btrfs/dax.c
index 88017f8799d1..6d68d39cc5da 100644
--- a/fs/btrfs/dax.c
+++ b/fs/btrfs/dax.c
@@ -198,10 +198,13 @@ vm_fault_t btrfs_dax_fault(struct vm_fault *vmf)
pfn_t pfn;
struct address_space *mapping = vmf->vma->vm_file->f_mapping;
XA_STATE(xas, &mapping->i_pages, vmf->pgoff);
+ unsigned long vaddr = vmf->address;
struct inode *inode = mapping->host;
loff_t pos = (loff_t)vmf->pgoff << PAGE_SHIFT;
void *entry = NULL;
vm_fault_t ret = 0;
+ struct extent_map *em;
+ struct dax_device *dax_dev;
if (pos > i_size_read(inode)) {
ret = VM_FAULT_SIGBUS;
@@ -214,21 +217,33 @@ vm_fault_t btrfs_dax_fault(struct vm_fault *vmf)
goto out;
}
- if (!vmf->cow_page) {
+ em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, pos, PAGE_SIZE, 0);
+ if (em->block_start != EXTENT_MAP_HOLE)
+ dax_dev = fs_dax_get_by_bdev(em->bdev);
+
+ if (vmf->cow_page) {
+ sector_t sector;
+ if (em->block_start == EXTENT_MAP_HOLE) {
+ clear_user_highpage(vmf->cow_page, vaddr);
+ goto out;
+ }
+ sector = (get_start_sect(em->bdev) << 9) + (em->block_start + (pos - em->start));
+ sector >>= 9;
+ ret = copy_user_dax(em->bdev, dax_dev, sector, PAGE_SIZE, vmf->cow_page, vaddr);
+ goto out;
+ } else {
sector_t sector;
- struct extent_map *em;
- em = btrfs_get_extent(BTRFS_I(inode), NULL, 0, pos, PAGE_SIZE, 0);
if (em->block_start == EXTENT_MAP_HOLE) {
ret = dax_load_hole(&xas, mapping, entry, vmf);
goto out;
}
sector = ((get_start_sect(em->bdev) << 9) +
(em->block_start + (pos - em->start))) >> 9;
- ret = dax_pfn(fs_dax_get_by_bdev(em->bdev), em->bdev, sector, PAGE_SIZE, &pfn);
+ ret = dax_pfn(dax_dev, em->bdev, sector, PAGE_SIZE, &pfn);
if (ret)
goto out;
dax_insert_entry(&xas, mapping, vmf, entry, pfn, 0, false);
- ret = vmf_insert_mixed(vmf->vma, vmf->address, pfn);
+ ret = vmf_insert_mixed(vmf->vma, vaddr, pfn);
}
out:
if (entry)
--
2.16.4
next prev parent reply other threads:[~2018-12-05 12:29 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-05 12:28 [PATCH 00/10] btrfs: Support for DAX devices Goldwyn Rodrigues
2018-12-05 12:28 ` [PATCH 01/10] btrfs: create a mount option for dax Goldwyn Rodrigues
2018-12-05 12:42 ` Johannes Thumshirn
2018-12-05 12:43 ` Nikolay Borisov
2018-12-05 14:59 ` Adam Borowski
2018-12-05 12:28 ` [PATCH 02/10] btrfs: basic dax read Goldwyn Rodrigues
2018-12-05 13:11 ` Nikolay Borisov
2018-12-05 13:22 ` Johannes Thumshirn
2018-12-05 12:28 ` [PATCH 03/10] btrfs: dax: read zeros from holes Goldwyn Rodrigues
2018-12-05 13:26 ` Nikolay Borisov
2018-12-05 12:28 ` [PATCH 04/10] Rename __endio_write_update_ordered() to btrfs_update_ordered_extent() Goldwyn Rodrigues
2018-12-05 13:35 ` Nikolay Borisov
2018-12-05 12:28 ` [PATCH 05/10] btrfs: Carve out btrfs_get_extent_map_write() out of btrfs_get_blocks_write() Goldwyn Rodrigues
2018-12-05 12:28 ` [PATCH 06/10] btrfs: dax write support Goldwyn Rodrigues
2018-12-05 13:56 ` Johannes Thumshirn
2018-12-05 12:28 ` [PATCH 07/10] dax: export functions for use with btrfs Goldwyn Rodrigues
2018-12-05 13:59 ` Johannes Thumshirn
2018-12-05 14:52 ` Christoph Hellwig
2018-12-06 11:46 ` Goldwyn Rodrigues
2018-12-12 8:07 ` Christoph Hellwig
2019-03-26 19:36 ` Dan Williams
2019-03-27 11:10 ` Goldwyn Rodrigues
2018-12-05 12:28 ` [PATCH 08/10] btrfs: dax add read mmap path Goldwyn Rodrigues
2018-12-05 12:28 ` Goldwyn Rodrigues [this message]
2018-12-05 12:28 ` [PATCH 10/10] btrfs: dax mmap write Goldwyn Rodrigues
2018-12-05 13:03 ` [PATCH 00/10] btrfs: Support for DAX devices Qu Wenruo
2018-12-05 21:36 ` Jeff Mahoney
2018-12-05 13:57 ` Adam Borowski
2018-12-05 21:37 ` Jeff Mahoney
2018-12-06 7:40 ` Robert White
2018-12-06 10:07 ` Johannes Thumshirn
2018-12-06 11:47 ` Goldwyn Rodrigues
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