Messages in this thread Patch in this message | ![/](/images/icornerl.gif) | | Date | Wed, 20 Mar 2024 17:38:47 +0800 | Subject | Re: [f2fs-dev] [PATCH v3] f2fs: prevent writing without fallocate() for pinned files | From | Chao Yu <> |
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On 2024/3/20 5:23, Daeho Jeong wrote: > From: Daeho Jeong <daehojeong@google.com> > > In a case writing without fallocate(), we can't guarantee it's allocated > in the conventional area for zoned stroage. > > Signed-off-by: Daeho Jeong <daehojeong@google.com> > --- > v2: covered the direct io case > v3: covered the mkwrite case > --- > fs/f2fs/data.c | 14 ++++++++++++-- > fs/f2fs/file.c | 16 ++++++++-------- > 2 files changed, 20 insertions(+), 10 deletions(-) > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > index c21b92f18463..d3e5ab2736a6 100644 > --- a/fs/f2fs/data.c > +++ b/fs/f2fs/data.c > @@ -1584,8 +1584,11 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map, int flag) > > /* use out-place-update for direct IO under LFS mode */ > if (map->m_may_create && > - (is_hole || (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO))) { > - if (unlikely(f2fs_cp_error(sbi))) { > + (is_hole || (f2fs_lfs_mode(sbi) && flag == F2FS_GET_BLOCK_DIO && > + !f2fs_is_pinned_file(inode)))) { > + if (unlikely(f2fs_cp_error(sbi)) || > + (f2fs_is_pinned_file(inode) && is_hole && > + flag != F2FS_GET_BLOCK_PRE_DIO)) { > err = -EIO; > goto sync_out; > } > @@ -3378,6 +3381,8 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi, > f2fs_map_lock(sbi, flag); > locked = true; > } else if ((pos & PAGE_MASK) >= i_size_read(inode)) { > + if (f2fs_is_pinned_file(inode)) > + return -EIO; > f2fs_map_lock(sbi, flag); > locked = true; > } > @@ -3407,6 +3412,11 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi, > > if (!f2fs_lookup_read_extent_cache_block(inode, index, > &dn.data_blkaddr)) { > + if (f2fs_is_pinned_file(inode)) { > + err = -EIO; > + goto out; > + } > + > if (locked) { > err = f2fs_reserve_block(&dn, index); > goto out; > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > index 82277e95c88f..4db3b21c804b 100644 > --- a/fs/f2fs/file.c > +++ b/fs/f2fs/file.c > @@ -57,7 +57,7 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) > struct inode *inode = file_inode(vmf->vma->vm_file); > struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > struct dnode_of_data dn; > - bool need_alloc = true; > + bool need_alloc = !f2fs_is_pinned_file(inode);
Will this check races w/ pinfile get|set?
Thanks,
> int err = 0; > vm_fault_t ret; > > @@ -114,19 +114,15 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf) > goto out_sem; > } > > + set_new_dnode(&dn, inode, NULL, NULL, 0); > if (need_alloc) { > /* block allocation */ > - set_new_dnode(&dn, inode, NULL, NULL, 0); > err = f2fs_get_block_locked(&dn, page->index); > - } > - > -#ifdef CONFIG_F2FS_FS_COMPRESSION > - if (!need_alloc) { > - set_new_dnode(&dn, inode, NULL, NULL, 0); > + } else { > err = f2fs_get_dnode_of_data(&dn, page->index, LOOKUP_NODE); > f2fs_put_dnode(&dn); > } > -#endif > + > if (err) { > unlock_page(page); > goto out_sem; > @@ -4611,6 +4607,10 @@ static int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *iter, > return ret; > } > > + /* For pinned files, it should be fallocate()-ed in advance. */ > + if (f2fs_is_pinned_file(inode)) > + return 0; > + > /* Do not preallocate blocks that will be written partially in 4KB. */ > map.m_lblk = F2FS_BLK_ALIGN(pos); > map.m_len = F2FS_BYTES_TO_BLK(pos + count);
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