Hi Qiuyang,
On 2017/6/23 11:37, Sun Qiuyang wrote:
> Hi Chao,
>
> Thanks for pointing it out. See below for how to fix this issue.
>
>
>> Hi Qiuyang
>>
>> As I tested with pmem, this patch will corrupt f2fs image with generic/051
>> of fstest suit.
>>
>> Could you please take a look at this issue?
>>
>> Thanks,
>>
>> On 2017/6/15 16:56, sunqiuyang wrote:
>>> From: Qiuyang Sun <sunqiuy...@huawei.com>
>>>
>>> This patch implements Direct Access (DAX) in F2FS.
>>>
>>> Signed-off-by: Qiuyang Sun <sunqiuy...@huawei.com>
>>> ---
>>>
>>> Changelog v3 -> v4:
>>>
>>> <data.c>
>>> In f2fs_iomap_begin():
>>> - For the write branch, if f2fs_map_blocks() returns error (probably due to
>>> ENOSPC), the allocated blocks beyond original_i_size are truncated.
>>> - For the read branch, use F2FS_GET_BLOCK_FIEMAP instead of READ for
>>> f2fs_map_blocks(), so that contiguous unwritten blocks can be treated in
>>> a batch. Accordingly, judge F2FS_MAP_UNWRITTEN before F2FS_MAP_MAPPED for
>>> iomap->type.
>>>
>>> - Add a call of f2fs_update_time() in f2fs_iomap_end().
>>>
>>> <file.c>
>>> - In f2fs_move_file_range() and f2fs_ioc_defragment(), return -EINVAL for
>>> DAX files, as the current implementation uses page cache.
>>> - Call f2fs_bug_on() in f2fs_ioc_commit_atomic_write() and
>>> f2fs_ioc_(release|abort)_volatile_write() when the inode is DAX, which
>>> should not happen.
>>>
>>> <gc.c>
>>> - Optimize the logic in dax_move_data_page().
>>>
>>> <inode.c>
>>> - Enable setting the S_DAX flag for an inode in f2fs_set_inode_flags().
>>>
>>> The v4 patch is at f2fs-dev-test.
>>>
>>> ---
>>> fs/f2fs/data.c | 100 +++++++++++++++++++++++++++++
>>> fs/f2fs/f2fs.h | 8 +++
>>> fs/f2fs/file.c | 192
>>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
>>> fs/f2fs/gc.c | 104 ++++++++++++++++++++++++++++--
>>> fs/f2fs/inline.c | 4 ++
>>> fs/f2fs/inode.c | 8 ++-
>>> fs/f2fs/namei.c | 5 ++
>>> fs/f2fs/super.c | 15 +++++
>>> 8 files changed, 429 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
>>> index 7d3af48..58efce0 100644
>>> --- a/fs/f2fs/data.c
>>> +++ b/fs/f2fs/data.c
>>> @@ -2257,3 +2257,103 @@ int f2fs_migrate_page(struct address_space *mapping,
>>> .migratepage = f2fs_migrate_page,
>>> #endif
>>> };
>>> +
>>> +#ifdef CONFIG_FS_DAX
>>> +#include <linux/iomap.h>
>>> +#include <linux/dax.h>
>>> +
>>> +static int f2fs_iomap_begin(struct inode *inode, loff_t offset,
>>> + loff_t length, unsigned int flags, struct iomap *iomap)
>>> +{
>>> + struct block_device *bdev;
>>> + unsigned long first_block = F2FS_BYTES_TO_BLK(offset);
>>> + unsigned long last_block = F2FS_BYTES_TO_BLK(offset + length - 1);
>>> + struct f2fs_map_blocks map;
>>> + int ret;
>>> +
>>> + if (WARN_ON_ONCE(f2fs_has_inline_data(inode)))
>>> + return -ERANGE;
>>> +
>>> + map.m_lblk = first_block;
>>> + map.m_len = last_block - first_block + 1;
>>> + map.m_next_pgofs = NULL;
>>> +
>>> + if (!(flags & IOMAP_WRITE))
>>> + ret = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_FIEMAP);
>>> + else {
>>> + /* i_size should be kept here and changed later in f2fs_iomap_end */
>>> + loff_t original_i_size = i_size_read(inode);
>>> +
>>> + ret = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
>
> The flag F2FS_GET_BLOCK_PRE_DIO will allow allocating new blocks in
> batch whose physical addresses are not contiguous, and thus user data
> could be written to incorrect block addresses afterwards, even
> overwriting metadata blocks and causing FS inconsistency.
>
> The test "generic/051" can be passed by using F2FS_GET_BLOCK_FIEMAP
> instead in the write branch here.
Good catch!
As we discussed, F2FS_GET_BLOCK_FIEMAP is designed only for read path, so
F2FS_GET_BLOCK_DIO is preferred.
Thanks,
>
>>> + if (i_size_read(inode) > original_i_size) {
>>> + f2fs_i_size_write(inode, original_i_size);
>>> + if (ret) {
>>> + truncate_pagecache(inode, original_i_size);
>>> + truncate_blocks(inode, original_i_size, true);
>>> + }
>>> + }
>>> + }
>>> +
>>> + if (ret)
>>> + return ret;
>>> +
>>> + iomap->flags = 0;
>>> + bdev = inode->i_sb->s_bdev;
>>> + iomap->bdev = bdev;
>>> + if (blk_queue_dax(bdev->bd_queue))
>>> + iomap->dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
>>> + else
>>> + iomap->dax_dev = NULL;
>>> + iomap->offset = F2FS_BLK_TO_BYTES((u64)first_block);
>>> +
>>> + if (map.m_len == 0) {
>>> + iomap->type = IOMAP_HOLE;
>>> + iomap->blkno = IOMAP_NULL_BLOCK;
>>> + iomap->length = F2FS_BLKSIZE;
>>> + } else {
>>> + if (map.m_flags & F2FS_MAP_UNWRITTEN) {
>>> + iomap->type = IOMAP_UNWRITTEN;
>>> + } else if (map.m_flags & F2FS_MAP_MAPPED) {
>>> + iomap->type = IOMAP_MAPPED;
>>> + } else {
>>> + WARN_ON_ONCE(1);
>>> + return -EIO;
>>> + }
>>> + iomap->blkno =
>>> + (sector_t)map.m_pblk << F2FS_LOG_SECTORS_PER_BLOCK;
>>> + iomap->length = F2FS_BLK_TO_BYTES((u64)map.m_len);
>>> + }
>>> +
>>> + if (map.m_flags & F2FS_MAP_NEW)
>>> + iomap->flags |= IOMAP_F_NEW;
>>> + return 0;
>>> +}
>>> +
>>> +static int f2fs_iomap_end(struct inode *inode, loff_t offset, loff_t
>>> length,
>>> + ssize_t written, unsigned int flags, struct iomap *iomap)
>>> +{
>>> + put_dax(iomap->dax_dev);
>>> + if (!(flags & IOMAP_WRITE) || (flags & IOMAP_FAULT))
>>> + return 0;
>>> +
>>> + if (offset + written > i_size_read(inode))
>>> + f2fs_i_size_write(inode, offset + written);
>>> +
>>> + if (iomap->offset + iomap->length >
>>> + ALIGN(i_size_read(inode), F2FS_BLKSIZE)) {
>>> + block_t written_blk = F2FS_BYTES_TO_BLK(offset + written);
>>> + block_t end_blk = F2FS_BYTES_TO_BLK(offset + length);
>>> +
>>> + if (written_blk < end_blk)
>>> + f2fs_write_failed(inode->i_mapping, offset + length);
>>> + }
>>> +
>>> + f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
>>> + return 0;
>>> +}
>>> +
>>> +struct iomap_ops f2fs_iomap_ops = {
>>> + .iomap_begin = f2fs_iomap_begin,
>>> + .iomap_end = f2fs_iomap_end,
>>> +};
>>> +#endif
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index 91db1d0..f862b6b 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -88,6 +88,11 @@ struct f2fs_fault_info {
>>> #define F2FS_MOUNT_FAULT_INJECTION 0x00010000
>>> #define F2FS_MOUNT_ADAPTIVE 0x00020000
>>> #define F2FS_MOUNT_LFS 0x00040000
>>> +#ifdef CONFIG_FS_DAX
>>> +#define F2FS_MOUNT_DAX 0x00080000 /* Direct Access */
>>> +#else
>>> +#define F2FS_MOUNT_DAX 0
>>> +#endif
>>>
>>> #define clear_opt(sbi, option) ((sbi)->mount_opt.opt &=
>>> ~F2FS_MOUNT_##option)
>>> #define set_opt(sbi, option) ((sbi)->mount_opt.opt |=
>>> F2FS_MOUNT_##option)
>>> @@ -2390,6 +2395,9 @@ void f2fs_invalidate_page(struct page *page, unsigned
>>> int offset,
>>> int f2fs_migrate_page(struct address_space *mapping, struct page *newpage,
>>> struct page *page, enum migrate_mode mode);
>>> #endif
>>> +#ifdef CONFIG_FS_DAX
>>> +extern struct iomap_ops f2fs_iomap_ops;
>>> +#endif
>>>
>>> /*
>>> * gc.c
>>> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
>>> index 6a201c6..e7352a6 100644
>>> --- a/fs/f2fs/file.c
>>> +++ b/fs/f2fs/file.c
>>> @@ -23,6 +23,10 @@
>>> #include <linux/uio.h>
>>> #include <linux/uuid.h>
>>> #include <linux/file.h>
>>> +#ifdef CONFIG_FS_DAX
>>> +#include <linux/dax.h>
>>> +#include <linux/iomap.h>
>>> +#endif
>>>
>>> #include "f2fs.h"
>>> #include "node.h"
>>> @@ -121,6 +125,64 @@ static int f2fs_vm_page_mkwrite(struct vm_fault *vmf)
>>> .page_mkwrite = f2fs_vm_page_mkwrite,
>>> };
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> +static int f2fs_dax_huge_fault(struct vm_fault *vmf,
>>> + enum page_entry_size pe_size)
>>> +{
>>> + int result;
>>> + struct inode *inode = file_inode(vmf->vma->vm_file);
>>> + struct super_block *sb = inode->i_sb;
>>> + bool write = vmf->flags & FAULT_FLAG_WRITE;
>>> +
>>> + if (write) {
>>> + sb_start_pagefault(sb);
>>> + file_update_time(vmf->vma->vm_file);
>>> + }
>>> + down_read(&F2FS_I(inode)->i_mmap_sem);
>>> + result = dax_iomap_fault(vmf, pe_size, &f2fs_iomap_ops);
>>> + up_read(&F2FS_I(inode)->i_mmap_sem);
>>> + if (write)
>>> + sb_end_pagefault(sb);
>>> +
>>> + return result;
>>> +}
>>> +
>>> +static int f2fs_dax_fault(struct vm_fault *vmf)
>>> +{
>>> + return f2fs_dax_huge_fault(vmf, PE_SIZE_PTE);
>>> +}
>>> +
>>> +static int f2fs_dax_pfn_mkwrite(struct vm_fault *vmf)
>>> +{
>>> + struct inode *inode = file_inode(vmf->vma->vm_file);
>>> + struct super_block *sb = inode->i_sb;
>>> + loff_t size;
>>> + int ret;
>>> +
>>> + sb_start_pagefault(sb);
>>> + file_update_time(vmf->vma->vm_file);
>>> + down_read(&F2FS_I(inode)->i_mmap_sem);
>>> + size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT;
>>> + if (vmf->pgoff >= size)
>>> + ret = VM_FAULT_SIGBUS;
>>> + else
>>> + ret = dax_pfn_mkwrite(vmf);
>>> + up_read(&F2FS_I(inode)->i_mmap_sem);
>>> + sb_end_pagefault(sb);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static const struct vm_operations_struct f2fs_dax_vm_ops = {
>>> + .fault = f2fs_dax_fault,
>>> + .huge_fault = f2fs_dax_huge_fault,
>>> + .page_mkwrite = f2fs_dax_fault,
>>> + .pfn_mkwrite = f2fs_dax_pfn_mkwrite,
>>> +};
>>> +#else
>>> +#define f2fs_dax_vm_ops f2fs_file_vm_ops
>>> +#endif
>>> +
>>> static int get_parent_ino(struct inode *inode, nid_t *pino)
>>> {
>>> struct dentry *dentry;
>>> @@ -436,7 +498,13 @@ static int f2fs_file_mmap(struct file *file, struct
>>> vm_area_struct *vma)
>>> return err;
>>>
>>> file_accessed(file);
>>> - vma->vm_ops = &f2fs_file_vm_ops;
>>> +
>>> + if (IS_DAX(inode)) {
>>> + vma->vm_ops = &f2fs_dax_vm_ops;
>>> + vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
>>> + } else
>>> + vma->vm_ops = &f2fs_file_vm_ops;
>>> +
>>> return 0;
>>> }
>>>
>>> @@ -520,6 +588,17 @@ static int truncate_partial_data_page(struct inode
>>> *inode, u64 from,
>>> if (!offset && !cache_only)
>>> return 0;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (IS_DAX(inode)) {
>>> + int ret;
>>> +
>>> + down_read(&F2FS_I(inode)->dio_rwsem[WRITE]);
>>> + ret = iomap_zero_range(inode, from, PAGE_SIZE - offset,
>>> + NULL, &f2fs_iomap_ops);
>>> + up_read(&F2FS_I(inode)->dio_rwsem[WRITE]);
>>> + return ret;
>>> + }
>>> +#endif
>>> if (cache_only) {
>>> page = find_lock_page(mapping, index);
>>> if (page && PageUptodate(page))
>>> @@ -786,6 +865,18 @@ static int fill_zero(struct inode *inode, pgoff_t
>>> index,
>>> if (!len)
>>> return 0;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (IS_DAX(inode)) {
>>> + int ret;
>>> +
>>> + down_read(&F2FS_I(inode)->dio_rwsem[WRITE]);
>>> + ret = iomap_zero_range(inode,
>>> + F2FS_BLK_TO_BYTES((loff_t)index) + start,
>>> + len, NULL, &f2fs_iomap_ops);
>>> + up_read(&F2FS_I(inode)->dio_rwsem[WRITE]);
>>> + return ret;
>>> + }
>>> +#endif
>>> f2fs_balance_fs(sbi, true);
>>>
>>> f2fs_lock_op(sbi);
>>> @@ -1108,6 +1199,11 @@ static int f2fs_collapse_range(struct inode *inode,
>>> loff_t offset, loff_t len)
>>> loff_t new_size;
>>> int ret;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + /* The current implementation does not apply to DAX files. */
>>> + if (IS_DAX(inode))
>>> + return -EINVAL;
>>> +#endif
>>> if (offset + len >= i_size_read(inode))
>>> return -EINVAL;
>>>
>>> @@ -1298,6 +1394,11 @@ static int f2fs_insert_range(struct inode *inode,
>>> loff_t offset, loff_t len)
>>> loff_t new_size;
>>> int ret = 0;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + /* The current implementation does not apply to DAX files. */
>>> + if (IS_DAX(inode))
>>> + return -EINVAL;
>>> +#endif
>>> new_size = i_size_read(inode) + len;
>>> ret = inode_newsize_ok(inode, new_size);
>>> if (ret)
>>> @@ -1561,6 +1662,10 @@ static int f2fs_ioc_start_atomic_write(struct file
>>> *filp)
>>> struct inode *inode = file_inode(filp);
>>> int ret;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (IS_DAX(inode))
>>> + return -EINVAL;
>>> +#endif
>>> if (!inode_owner_or_capable(inode))
>>> return -EACCES;
>>>
>>> @@ -1610,6 +1715,9 @@ static int f2fs_ioc_commit_atomic_write(struct file
>>> *filp)
>>> struct inode *inode = file_inode(filp);
>>> int ret;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + f2fs_bug_on(F2FS_I_SB(inode), IS_DAX(inode));
>>> +#endif
>>> if (!inode_owner_or_capable(inode))
>>> return -EACCES;
>>>
>>> @@ -1646,6 +1754,10 @@ static int f2fs_ioc_start_volatile_write(struct file
>>> *filp)
>>> struct inode *inode = file_inode(filp);
>>> int ret;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (IS_DAX(inode))
>>> + return -EINVAL;
>>> +#endif
>>> if (!inode_owner_or_capable(inode))
>>> return -EACCES;
>>>
>>> @@ -1681,6 +1793,9 @@ static int f2fs_ioc_release_volatile_write(struct
>>> file *filp)
>>> struct inode *inode = file_inode(filp);
>>> int ret;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + f2fs_bug_on(F2FS_I_SB(inode), IS_DAX(inode));
>>> +#endif
>>> if (!inode_owner_or_capable(inode))
>>> return -EACCES;
>>>
>>> @@ -1710,6 +1825,9 @@ static int f2fs_ioc_abort_volatile_write(struct file
>>> *filp)
>>> struct inode *inode = file_inode(filp);
>>> int ret;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + f2fs_bug_on(F2FS_I_SB(inode), IS_DAX(inode));
>>> +#endif
>>> if (!inode_owner_or_capable(inode))
>>> return -EACCES;
>>>
>>> @@ -2080,6 +2198,10 @@ static int f2fs_ioc_defragment(struct file *filp,
>>> unsigned long arg)
>>> struct f2fs_defragment range;
>>> int err;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (IS_DAX(inode))
>>> + return -EINVAL;
>>> +#endif
>>> if (!capable(CAP_SYS_ADMIN))
>>> return -EPERM;
>>>
>>> @@ -2129,6 +2251,10 @@ static int f2fs_move_file_range(struct file
>>> *file_in, loff_t pos_in,
>>> size_t dst_osize;
>>> int ret;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (IS_DAX(src) || IS_DAX(dst))
>>> + return -EINVAL;
>>> +#endif
>>> if (file_in->f_path.mnt != file_out->f_path.mnt ||
>>> src->i_sb != dst->i_sb)
>>> return -EXDEV;
>>> @@ -2368,6 +2494,61 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd,
>>> unsigned long arg)
>>> }
>>> }
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> +static ssize_t f2fs_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
>>> +{
>>> + struct inode *inode = file_inode(iocb->ki_filp);
>>> + ssize_t ret;
>>> +
>>> + inode_lock_shared(inode);
>>> +
>>> + if (!IS_DAX(inode)) {
>>> + inode_unlock_shared(inode);
>>> + return generic_file_read_iter(iocb, to);
>>> + }
>>> +
>>> + down_read(&F2FS_I(inode)->dio_rwsem[READ]);
>>> + ret = dax_iomap_rw(iocb, to, &f2fs_iomap_ops);
>>> + up_read(&F2FS_I(inode)->dio_rwsem[READ]);
>>> + inode_unlock_shared(inode);
>>> +
>>> + file_accessed(iocb->ki_filp);
>>> + return ret;
>>> +}
>>> +
>>> +static ssize_t f2fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
>>> +{
>>> + if (!iov_iter_count(to))
>>> + return 0; /* skip atime */
>>> +
>>> + if (IS_DAX(file_inode(iocb->ki_filp)))
>>> + return f2fs_dax_read_iter(iocb, to);
>>> +
>>> + return generic_file_read_iter(iocb, to);
>>> +}
>>> +
>>> +static ssize_t f2fs_dax_write_iter(struct kiocb *iocb, struct iov_iter
>>> *from)
>>> +{
>>> + struct inode *inode = file_inode(iocb->ki_filp);
>>> + ssize_t ret;
>>> +
>>> + ret = file_remove_privs(iocb->ki_filp);
>>> + if (ret)
>>> + return ret;
>>> + ret = file_update_time(iocb->ki_filp);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + down_read(&F2FS_I(inode)->dio_rwsem[WRITE]);
>>> + ret = dax_iomap_rw(iocb, from, &f2fs_iomap_ops);
>>> + up_read(&F2FS_I(inode)->dio_rwsem[WRITE]);
>>> +
>>> + return ret;
>>> +}
>>> +#else
>>> +#define f2fs_dax_write_iter __generic_file_write_iter
>>> +#endif
>>> +
>>> static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter
>>> *from)
>>> {
>>> struct file *file = iocb->ki_filp;
>>> @@ -2389,7 +2570,10 @@ static ssize_t f2fs_file_write_iter(struct kiocb
>>> *iocb, struct iov_iter *from)
>>> return err;
>>> }
>>> blk_start_plug(&plug);
>>> - ret = __generic_file_write_iter(iocb, from);
>>> + if (IS_DAX(inode))
>>> + ret = f2fs_dax_write_iter(iocb, from);
>>> + else
>>> + ret = __generic_file_write_iter(iocb, from);
>>> blk_finish_plug(&plug);
>>> clear_inode_flag(inode, FI_NO_PREALLOC);
>>> }
>>> @@ -2437,7 +2621,11 @@ long f2fs_compat_ioctl(struct file *file, unsigned
>>> int cmd, unsigned long arg)
>>>
>>> const struct file_operations f2fs_file_operations = {
>>> .llseek = f2fs_llseek,
>>> +#ifdef CONFIG_FS_DAX
>>> + .read_iter = f2fs_file_read_iter,
>>> +#else
>>> .read_iter = generic_file_read_iter,
>>> +#endif
>>> .write_iter = f2fs_file_write_iter,
>>> .open = f2fs_file_open,
>>> .release = f2fs_release_file,
>>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>>> index fa3d2e2..ade4f71 100644
>>> --- a/fs/f2fs/gc.c
>>> +++ b/fs/f2fs/gc.c
>>> @@ -700,6 +700,100 @@ static void move_encrypted_block(struct inode *inode,
>>> block_t bidx,
>>> f2fs_put_page(page, 1);
>>> }
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> +#include <linux/dax.h>
>>> +
>>> +static void dax_move_data_page(struct inode *inode, block_t bidx,
>>> + unsigned int segno, int off)
>>> +{
>>> + struct block_device *bdev = inode->i_sb->s_bdev;
>>> + struct dax_device *dax_dev;
>>> + struct dnode_of_data dn;
>>> + struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>>> + struct f2fs_summary sum;
>>> + struct node_info ni;
>>> + block_t old_blkaddr, new_blkaddr;
>>> + int err, id;
>>> + long map_len;
>>> + pgoff_t pgoff;
>>> + void *kaddr_old, *kaddr_new;
>>> + pfn_t pfn;
>>> +
>>> + f2fs_bug_on(sbi, f2fs_is_atomic_file(inode));
>>> +
>>> + if (blk_queue_dax(bdev->bd_queue))
>>> + dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
>>> + else
>>> + return;
>>> +
>>> + if (!check_valid_map(sbi, segno, off))
>>> + return;
>>> +
>>> + if (!down_write_trylock(&F2FS_I(inode)->i_mmap_sem))
>>> + return;
>>> +
>>> + unmap_mapping_range(inode->i_mapping, (loff_t)bidx << PAGE_SHIFT,
>>> + PAGE_SIZE, 1);
>>> + /* find the old block address */
>>> + set_new_dnode(&dn, inode, NULL, NULL, 0);
>>> + err = get_dnode_of_data(&dn, bidx, LOOKUP_NODE);
>>> + if (err)
>>> + goto out;
>>> + old_blkaddr = dn.data_blkaddr;
>>> + /* This page is already truncated */
>>> + if (old_blkaddr == NULL_ADDR)
>>> + goto put_dn;
>>> +
>>> + /* allocate a new block address */
>>> + get_node_info(sbi, dn.nid, &ni);
>>> + set_summary(&sum, dn.nid, dn.ofs_in_node, ni.version);
>>> + allocate_data_block(sbi, NULL, old_blkaddr, &new_blkaddr,
>>> + &sum, CURSEG_COLD_DATA, NULL, false);
>>> +
>>> + /* copy data page from old to new address in dax_bdev */
>>> + id = dax_read_lock();
>>> + err = bdev_dax_pgoff(bdev, SECTOR_FROM_BLOCK(old_blkaddr),
>>> + PAGE_SIZE, &pgoff);
>>> + if (err)
>>> + goto recover;
>>> + map_len = dax_direct_access(dax_dev, pgoff, 1, &kaddr_old, &pfn);
>>> + if (map_len < 0)
>>> + goto recover;
>>> + err = bdev_dax_pgoff(bdev, SECTOR_FROM_BLOCK(new_blkaddr),
>>> + PAGE_SIZE, &pgoff);
>>> + if (err)
>>> + goto recover;
>>> + map_len = dax_direct_access(dax_dev, pgoff, 1, &kaddr_new, &pfn);
>>> + if (map_len < 0)
>>> + goto recover;
>>> + copy_page((void __force *)kaddr_new, (void __force *)kaddr_old);
>>> +
>>> + f2fs_update_data_blkaddr(&dn, new_blkaddr);
>>> + set_inode_flag(inode, FI_APPEND_WRITE);
>>> + if (bidx == 0)
>>> + set_inode_flag(inode, FI_FIRST_BLOCK_WRITTEN);
>>> +
>>> +recover:
>>> + if (err || map_len < 0)
>>> + __f2fs_replace_block(sbi, &sum, new_blkaddr, old_blkaddr,
>>> + true, true);
>>> + dax_read_unlock(id);
>>> +put_dn:
>>> + f2fs_put_dnode(&dn);
>>> +out:
>>> + unmap_mapping_range(inode->i_mapping, (loff_t)bidx << PAGE_SHIFT,
>>> + PAGE_SIZE, 1);
>>> + up_write(&F2FS_I(inode)->i_mmap_sem);
>>> + put_dax(dax_dev);
>>> +}
>>> +#else
>>> +static void dax_move_data_page(struct inode *inode, block_t bidx,
>>> + unsigned int segno, int off)
>>> +{
>>> + return;
>>> +}
>>> +#endif
>>> +
>>> static void move_data_page(struct inode *inode, block_t bidx, int gc_type,
>>> unsigned int segno, int
>>> off)
>>> {
>>> @@ -818,9 +912,9 @@ static void gc_data_segment(struct f2fs_sb_info *sbi,
>>> struct f2fs_summary *sum,
>>> if (IS_ERR(inode) || is_bad_inode(inode))
>>> continue;
>>>
>>> - /* if encrypted inode, let's go phase 3 */
>>> - if (f2fs_encrypted_inode(inode) &&
>>> - S_ISREG(inode->i_mode)) {
>>> + /* if DAX or encrypted inode, let's go phase 3 */
>>> + if (IS_DAX(inode) || (f2fs_encrypted_inode(inode) &&
>>> + S_ISREG(inode->i_mode))) {
>>> add_gc_inode(gc_list, inode);
>>> continue;
>>> }
>>> @@ -858,7 +952,9 @@ static void gc_data_segment(struct f2fs_sb_info *sbi,
>>> struct f2fs_summary *sum,
>>>
>>> start_bidx = start_bidx_of_node(nofs, inode)
>>> + ofs_in_node;
>>> - if (f2fs_encrypted_inode(inode) &&
>>> S_ISREG(inode->i_mode))
>>> + if (IS_DAX(inode))
>>> + dax_move_data_page(inode, start_bidx, segno,
>>> off);
>>> + else if (f2fs_encrypted_inode(inode) &&
>>> S_ISREG(inode->i_mode))
>>> move_encrypted_block(inode, start_bidx, segno,
>>> off);
>>> else
>>> move_data_page(inode, start_bidx, gc_type,
>>> segno, off);
>>> diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
>>> index e0fd437..fd8b290 100644
>>> --- a/fs/f2fs/inline.c
>>> +++ b/fs/f2fs/inline.c
>>> @@ -28,6 +28,10 @@ bool f2fs_may_inline_data(struct inode *inode)
>>> if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
>>> return false;
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (IS_DAX(inode))
>>> + return false;
>>> +#endif
>>> return true;
>>> }
>>>
>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>>> index 1ff5bd4..aa16c52 100644
>>> --- a/fs/f2fs/inode.c
>>> +++ b/fs/f2fs/inode.c
>>> @@ -43,8 +43,14 @@ void f2fs_set_inode_flags(struct inode *inode)
>>> new_fl |= S_NOATIME;
>>> if (flags & FS_DIRSYNC_FL)
>>> new_fl |= S_DIRSYNC;
>>> +#ifdef CONFIG_FS_DAX
>>> + if (test_opt(F2FS_I_SB(inode), DAX) && S_ISREG(inode->i_mode) &&
>>> + !f2fs_has_inline_data(inode) && !f2fs_encrypted_inode(inode) &&
>>> + !f2fs_is_atomic_file(inode) && !f2fs_is_volatile_file(inode))
>>> + new_fl |= S_DAX;
>>> +#endif
>>> inode_set_flags(inode, new_fl,
>>> - S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
>>> + S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_DAX);
>>> }
>>>
>>> static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
>>> diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
>>> index c31b40e..8feeb9a 100644
>>> --- a/fs/f2fs/namei.c
>>> +++ b/fs/f2fs/namei.c
>>> @@ -60,6 +60,11 @@ static struct inode *f2fs_new_inode(struct inode *dir,
>>> umode_t mode)
>>> if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
>>> f2fs_set_encrypted_inode(inode);
>>>
>>> +#ifdef CONFIG_FS_DAX
>>> + if (test_opt(sbi, DAX) && S_ISREG(inode->i_mode) &&
>>> + !f2fs_has_inline_data(inode) && !f2fs_encrypted_inode(inode))
>>> + inode->i_flags |= S_DAX;
>>> +#endif
>>> set_inode_flag(inode, FI_NEW_INODE);
>>>
>>> if (test_opt(sbi, INLINE_XATTR))
>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>> index 8e39b85..74277cd 100644
>>> --- a/fs/f2fs/super.c
>>> +++ b/fs/f2fs/super.c
>>> @@ -106,6 +106,7 @@ enum {
>>> Opt_fault_injection,
>>> Opt_lazytime,
>>> Opt_nolazytime,
>>> + Opt_dax,
>>> Opt_err,
>>> };
>>>
>>> @@ -141,6 +142,7 @@ enum {
>>> {Opt_fault_injection, "fault_injection=%u"},
>>> {Opt_lazytime, "lazytime"},
>>> {Opt_nolazytime, "nolazytime"},
>>> + {Opt_dax, "dax"},
>>> {Opt_err, NULL},
>>> };
>>>
>>> @@ -380,6 +382,15 @@ static int parse_options(struct super_block *sb, char
>>> *options)
>>> case Opt_nolazytime:
>>> sb->s_flags &= ~MS_LAZYTIME;
>>> break;
>>> +#ifdef CONFIG_FS_DAX
>>> + case Opt_dax:
>>> + set_opt(sbi, DAX);
>>> + break;
>>> +#else
>>> + case Opt_dax:
>>> + f2fs_msg(sb, KERN_INFO, "dax option not supported");
>>> + break;
>>> +#endif
>>> default:
>>> f2fs_msg(sb, KERN_ERR,
>>> "Unrecognized mount option \"%s\" or missing
>>> value",
>>> @@ -775,6 +786,10 @@ static int f2fs_show_options(struct seq_file *seq,
>>> struct dentry *root)
>>> seq_printf(seq, ",fault_injection=%u",
>>> sbi->fault_info.inject_rate);
>>> #endif
>>> +#ifdef CONFIG_FS_DAX
>>> + if (test_opt(sbi, DAX))
>>> + seq_puts(seq, ",dax");
>>> +#endif
>>>
>>> return 0;
>>> }
>>>
>>
>>
>> .
>>
>
>
> .
>
