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b=a+wmTvJs/tsgtB5QnpxSjOYZoKDLt9V09pJulgNywqzT0ulg/kXoTz1ACmiJVrQLu hOlqIk1zL04VPrq11cZ2DsDpQFQiRUTEpWL42/XDrnOYdpCymhdM1rHnGJO4kcC33m VVzj35lIP+249D5GizFMPDqtei9fMlcP+dRkrwD82cjk4/Z0FJ2bgP+1alcGi8nLVL bJ6qsAZuNOBThMftdD3Q8DN3DzkIcquFhtvK+J9CZ8jtBqzuogExDgqPN2e4pXOasc 0WCjbTUesnY6Q6YsbSCSo9aMHPfTausbcgUp3tZmn7aKd+ty5igAMZu+KA8DJnsEG9 9XMKPxXYo7Pww== Date: Mon, 23 Sep 2024 15:14:13 +0000 To: Chao Yu Message-ID: References: <20240913212810.912171-1-daeho43@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-Headers-End: 1ssklf-0004lC-3i Subject: Re: [f2fs-dev] [PATCH] f2fs: introduce device aliasing file X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , From: Jaegeuk Kim via Linux-f2fs-devel Reply-To: Jaegeuk Kim Cc: Daeho Jeong , kernel-team@android.com, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: 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b=a+wmTvJs/tsgtB5QnpxSjOYZoKDLt9V09pJulgNywqzT0ulg/kXoTz1ACmiJVrQLu hOlqIk1zL04VPrq11cZ2DsDpQFQiRUTEpWL42/XDrnOYdpCymhdM1rHnGJO4kcC33m VVzj35lIP+249D5GizFMPDqtei9fMlcP+dRkrwD82cjk4/Z0FJ2bgP+1alcGi8nLVL bJ6qsAZuNOBThMftdD3Q8DN3DzkIcquFhtvK+J9CZ8jtBqzuogExDgqPN2e4pXOasc 0WCjbTUesnY6Q6YsbSCSo9aMHPfTausbcgUp3tZmn7aKd+ty5igAMZu+KA8DJnsEG9 9XMKPxXYo7Pww== Date: Mon, 23 Sep 2024 15:14:13 +0000 From: Jaegeuk Kim To: Chao Yu Cc: Daeho Jeong , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com, Daeho Jeong Subject: Re: [f2fs-dev] [PATCH] f2fs: introduce device aliasing file Message-ID: References: <20240913212810.912171-1-daeho43@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On 09/23, Chao Yu wrote: > On 2024/9/20 23:38, Daeho Jeong wrote: > > On Thu, Sep 19, 2024 at 6:14 AM Chao Yu wrote: > > > > > > On 2024/9/14 5:28, Daeho Jeong wrote: > > > > From: Daeho Jeong > > > > > > > > F2FS should understand how the device aliasing file works and support > > > > deleting the file after use. A device aliasing file can be created by > > > > mkfs.f2fs tool and it can map the whole device with an extrent, not > > > > using node blocks. The file space should be pinned and normally used for > > > > read-only usages. > > > > > > > > Signed-off-by: Daeho Jeong > > > > --- > > > > fs/f2fs/data.c | 5 +++++ > > > > fs/f2fs/extent_cache.c | 10 ++++++++++ > > > > fs/f2fs/f2fs.h | 5 +++++ > > > > fs/f2fs/file.c | 36 ++++++++++++++++++++++++++++++++---- > > > > fs/f2fs/inode.c | 10 ++++++++-- > > > > fs/f2fs/sysfs.c | 2 ++ > > > > 6 files changed, 62 insertions(+), 6 deletions(-) > > > > > > > > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c > > > > index 6457e5bca9c9..9ce92093ba1e 100644 > > > > --- a/fs/f2fs/data.c > > > > +++ b/fs/f2fs/data.c > > > > @@ -3423,6 +3423,11 @@ static int prepare_write_begin(struct f2fs_sb_info *sbi, > > > > > > > > if (!f2fs_lookup_read_extent_cache_block(inode, index, > > > > &dn.data_blkaddr)) { > > > > + if (IS_DEVICE_ALIASING(inode)) { > > > > + err = -ENODATA; > > > > + goto out; > > > > + } > > > > + > > > > if (locked) { > > > > err = f2fs_reserve_block(&dn, index); > > > > goto out; > > > > diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c > > > > index fd1fc06359ee..03883963b991 100644 > > > > --- a/fs/f2fs/extent_cache.c > > > > +++ b/fs/f2fs/extent_cache.c > > > > @@ -401,6 +401,11 @@ void f2fs_init_read_extent_tree(struct inode *inode, struct page *ipage) > > > > if (atomic_read(&et->node_cnt) || !ei.len) > > > > goto skip; > > > > > > > > + if (IS_DEVICE_ALIASING(inode)) { > > > > + et->largest = ei; > > > > + goto skip; > > > > + } > > > > + > > > > en = __attach_extent_node(sbi, et, &ei, NULL, > > > > &et->root.rb_root.rb_node, true); > > > > if (en) { > > > > @@ -463,6 +468,11 @@ static bool __lookup_extent_tree(struct inode *inode, pgoff_t pgofs, > > > > goto out; > > > > } > > > > > > > > + if (IS_DEVICE_ALIASING(inode)) { > > > > + ret = false; > > > > + goto out; > > > > + } > > > > + > > > > en = __lookup_extent_node(&et->root, et->cached_en, pgofs); > > > > if (!en) > > > > goto out; > > > > diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h > > > > index ac19c61f0c3e..59179b9b3a83 100644 > > > > --- a/fs/f2fs/f2fs.h > > > > +++ b/fs/f2fs/f2fs.h > > > > @@ -208,6 +208,7 @@ struct f2fs_mount_info { > > > > #define F2FS_FEATURE_CASEFOLD 0x00001000 > > > > #define F2FS_FEATURE_COMPRESSION 0x00002000 > > > > #define F2FS_FEATURE_RO 0x00004000 > > > > +#define F2FS_FEATURE_DEVICE_ALIAS 0x00008000 > > > > > > > > #define __F2FS_HAS_FEATURE(raw_super, mask) \ > > > > ((raw_super->feature & cpu_to_le32(mask)) != 0) > > > > @@ -3001,6 +3002,7 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr) > > > > #define F2FS_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ > > > > #define F2FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */ > > > > #define F2FS_CASEFOLD_FL 0x40000000 /* Casefolded file */ > > > > +#define F2FS_DEVICE_ALIAS_FL 0x80000000 /* File for aliasing a device */ > > > > > > > > #define F2FS_QUOTA_DEFAULT_FL (F2FS_NOATIME_FL | F2FS_IMMUTABLE_FL) > > > > > > > > @@ -3016,6 +3018,8 @@ static inline void f2fs_change_bit(unsigned int nr, char *addr) > > > > /* Flags that are appropriate for non-directories/regular files. */ > > > > #define F2FS_OTHER_FLMASK (F2FS_NODUMP_FL | F2FS_NOATIME_FL) > > > > > > > > +#define IS_DEVICE_ALIASING(inode) (F2FS_I(inode)->i_flags & F2FS_DEVICE_ALIAS_FL) > > > > + > > > > static inline __u32 f2fs_mask_flags(umode_t mode, __u32 flags) > > > > { > > > > if (S_ISDIR(mode)) > > > > @@ -4478,6 +4482,7 @@ F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM); > > > > F2FS_FEATURE_FUNCS(casefold, CASEFOLD); > > > > F2FS_FEATURE_FUNCS(compression, COMPRESSION); > > > > F2FS_FEATURE_FUNCS(readonly, RO); > > > > +F2FS_FEATURE_FUNCS(device_alias, DEVICE_ALIAS); > > > > > > > > #ifdef CONFIG_BLK_DEV_ZONED > > > > static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi, > > > > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > > > > index 168f08507004..0f4af6b303ff 100644 > > > > --- a/fs/f2fs/file.c > > > > +++ b/fs/f2fs/file.c > > > > @@ -727,6 +727,11 @@ int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock) > > > > > > > > trace_f2fs_truncate_blocks_enter(inode, from); > > > > > > > > + if (IS_DEVICE_ALIASING(inode) && from) { > > > > + err = -EINVAL; > > > > + goto out_err; > > > > + } > > > > + > > > > free_from = (pgoff_t)F2FS_BLK_ALIGN(from); > > > > > > > > if (free_from >= max_file_blocks(inode)) > > > > @@ -741,6 +746,21 @@ int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock) > > > > goto out; > > > > } > > > > > > > > + if (IS_DEVICE_ALIASING(inode)) { > > > > + struct extent_tree *et = F2FS_I(inode)->extent_tree[EX_READ]; > > > > + struct extent_info ei = et->largest; > > > > + unsigned int i; > > > > + > > > > + for (i = 0; i < ei.len; i++) > > > > + f2fs_invalidate_blocks(sbi, ei.blk + i); > > > > + > > > > + dec_valid_block_count(sbi, inode, ei.len); > > > > + f2fs_update_time(sbi, REQ_TIME); > > > > + > > > > + f2fs_put_page(ipage, 1); > > > > + goto out; > > > > + } > > > > + > > > > if (f2fs_has_inline_data(inode)) { > > > > f2fs_truncate_inline_inode(inode, ipage, from); > > > > f2fs_put_page(ipage, 1); > > > > @@ -776,7 +796,7 @@ int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock) > > > > /* lastly zero out the first data page */ > > > > if (!err) > > > > err = truncate_partial_data_page(inode, from, truncate_page); > > > > - > > > > +out_err: > > > > trace_f2fs_truncate_blocks_exit(inode, err); > > > > return err; > > > > } > > > > @@ -994,7 +1014,8 @@ int f2fs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, > > > > return -EPERM; > > > > > > > > if ((attr->ia_valid & ATTR_SIZE)) { > > > > - if (!f2fs_is_compress_backend_ready(inode)) > > > > + if (!f2fs_is_compress_backend_ready(inode) || > > > > + IS_DEVICE_ALIASING(inode)) > > > > return -EOPNOTSUPP; > > > > if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED) && > > > > !IS_ALIGNED(attr->ia_size, > > > > @@ -1855,7 +1876,7 @@ static long f2fs_fallocate(struct file *file, int mode, > > > > return -EIO; > > > > if (!f2fs_is_checkpoint_ready(F2FS_I_SB(inode))) > > > > return -ENOSPC; > > > > - if (!f2fs_is_compress_backend_ready(inode)) > > > > + if (!f2fs_is_compress_backend_ready(inode) || IS_DEVICE_ALIASING(inode)) > > > > return -EOPNOTSUPP; > > > > > > > > /* f2fs only support ->fallocate for regular file */ > > > > @@ -3264,6 +3285,9 @@ int f2fs_pin_file_control(struct inode *inode, bool inc) > > > > struct f2fs_inode_info *fi = F2FS_I(inode); > > > > struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > > > > > > > > + if (IS_DEVICE_ALIASING(inode)) > > > > + return -EINVAL; > > > > + > > > > if (fi->i_gc_failures >= sbi->gc_pin_file_threshold) { > > > > f2fs_warn(sbi, "%s: Enable GC = ino %lx after %x GC trials", > > > > __func__, inode->i_ino, fi->i_gc_failures); > > > > @@ -3294,6 +3318,9 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg) > > > > if (f2fs_readonly(sbi->sb)) > > > > return -EROFS; > > > > > > > > + if (!pin && IS_DEVICE_ALIASING(inode)) > > > > + return -EOPNOTSUPP; > > > > + > > > > ret = mnt_want_write_file(filp); > > > > if (ret) > > > > return ret; > > > > @@ -4711,7 +4738,8 @@ static int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *iter, > > > > else > > > > return 0; > > > > > > > > - map.m_may_create = true; > > > > + if (!IS_DEVICE_ALIASING(inode)) > > > > + map.m_may_create = true; > > > > if (dio) { > > > > map.m_seg_type = f2fs_rw_hint_to_seg_type(sbi, > > > > inode->i_write_hint); > > > > diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c > > > > index aef57172014f..f118e955ba88 100644 > > > > --- a/fs/f2fs/inode.c > > > > +++ b/fs/f2fs/inode.c > > > > @@ -367,6 +367,12 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page) > > > > return false; > > > > } > > > > > > > > + if ((fi->i_flags & F2FS_DEVICE_ALIAS_FL) && !f2fs_sb_has_device_alias(sbi)) { > > > > + f2fs_warn(sbi, "%s: inode (ino=%lx) has device alias flag, but the feature is off", > > > > + __func__, inode->i_ino); > > > > + return false; > > > > + } > > > > > > Do we need to do sanity check device_alias feature flag w/ > > > sb.devs[].path format? and related inode? > > > > Sorry, I am not sure I got your point. Could you elaborate it more? > > Oh, sorry, I misunderstand it. alias_filename won't be stored in sb.devs[].path, > please ignore it. > > Another point is: what do you think of doing sanity check on extent_info of > device_alias inode? > > we can check whether its extent points to whole region of target alias device or > not? Chao, I think we can add this later, as I'd like to queue this in the merge window. Wdyt? > > Thanks, > > > > > > > > > > + > > > > return true; > > > > } > > > > > > > > @@ -818,8 +824,6 @@ void f2fs_evict_inode(struct inode *inode) > > > > f2fs_bug_on(sbi, get_dirty_pages(inode)); > > > > f2fs_remove_dirty_inode(inode); > > > > > > > > - f2fs_destroy_extent_tree(inode); > > > > > > For hardlink inode, it missed to call f2fs_destroy_extent_tree()? > > > > Got it. > > > > > > > > Thanks, > > > > > > > - > > > > if (inode->i_nlink || is_bad_inode(inode)) > > > > goto no_delete; > > > > > > > > @@ -874,6 +878,8 @@ void f2fs_evict_inode(struct inode *inode) > > > > goto retry; > > > > } > > > > > > > > + f2fs_destroy_extent_tree(inode); > > > > + > > > > if (err) { > > > > f2fs_update_inode_page(inode); > > > > if (dquot_initialize_needed(inode)) > > > > diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c > > > > index fee7ee45ceaa..bf64f4cc3522 100644 > > > > --- a/fs/f2fs/sysfs.c > > > > +++ b/fs/f2fs/sysfs.c > > > > @@ -1281,6 +1281,7 @@ F2FS_SB_FEATURE_RO_ATTR(sb_checksum, SB_CHKSUM); > > > > F2FS_SB_FEATURE_RO_ATTR(casefold, CASEFOLD); > > > > F2FS_SB_FEATURE_RO_ATTR(compression, COMPRESSION); > > > > F2FS_SB_FEATURE_RO_ATTR(readonly, RO); > > > > +F2FS_SB_FEATURE_RO_ATTR(device_alias, DEVICE_ALIAS); > > > > > > > > static struct attribute *f2fs_sb_feat_attrs[] = { > > > > ATTR_LIST(sb_encryption), > > > > @@ -1297,6 +1298,7 @@ static struct attribute *f2fs_sb_feat_attrs[] = { > > > > ATTR_LIST(sb_casefold), > > > > ATTR_LIST(sb_compression), > > > > ATTR_LIST(sb_readonly), > > > > + ATTR_LIST(sb_device_alias), > > > > NULL, > > > > }; > > > > ATTRIBUTE_GROUPS(f2fs_sb_feat); > > > >