| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <ZvIjG8NQlwSI1GLX@google.com>
Date: Tue, 24 Sep 2024 02:25:31 +0000
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: Daeho Jeong <daeho43@...il.com>, linux-kernel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net, kernel-team@...roid.com,
Daeho Jeong <daehojeong@...gle.com>
Subject: Re: [f2fs-dev] [PATCH v2] f2fs: introduce device aliasing file
On 09/24, Chao Yu wrote:
> On 2024/9/23 23:53, Daeho Jeong wrote:
> > From: Daeho Jeong <daehojeong@...gle.com>
> >
> > 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 <daehojeong@...gle.com>
> > ---
> > v2: changed the position of f2fs_destroy_extent_tree() only for device
> > aliasing files
> > ---
> > 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 | 12 +++++++++++-
> > fs/f2fs/sysfs.c | 2 ++
> > 6 files changed, 65 insertions(+), 5 deletions(-)
> >
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index b94cf6eea2f9..385b46e62ede 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -3441,6 +3441,11 @@ 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 62ac440d9416..0c8a705faa8b 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;
> > + }
>
> device alias feature replies on extent cache mount option, right? do
> we need to check noextent_cache option during parse_options()?
Oh, if we hit !__may_extent_tree() above, we'll break the layout. I now feel
I need to stop rushing this in this merge window. Daeho, could you please
check these corner cases?
385 if (!__may_extent_tree(inode, EX_READ)) {
386 /* drop largest read extent */
387 if (i_ext->len) {
388 f2fs_wait_on_page_writeback(ipage, NODE, true, true);
389 i_ext->len = 0;
390 set_page_dirty(ipage);
391 }
392 set_inode_flag(inode, FI_NO_EXTENT);
393 return;
394 }
>
> Thanks,
>
> > +
> > 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 33f5449dc22d..b6ba22a1da47 100644
> > --- a/fs/f2fs/f2fs.h
> > +++ b/fs/f2fs/f2fs.h
> > @@ -213,6 +213,7 @@ 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)
> > @@ -3046,6 +3047,7 @@ 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)
> > @@ -3061,6 +3063,8 @@ 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))
> > @@ -4510,6 +4514,7 @@ 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 99903eafa7fe..f2d2d84d025b 100644
> > --- a/fs/f2fs/file.c
> > +++ b/fs/f2fs/file.c
> > @@ -725,6 +725,11 @@ 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))
> > @@ -739,6 +744,21 @@ 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);
> > @@ -774,7 +794,7 @@ 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;
> > }
> > @@ -992,7 +1012,8 @@ 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,
> > @@ -1860,7 +1881,7 @@ 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 */
> > @@ -3296,6 +3317,9 @@ 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);
> > @@ -3326,6 +3350,9 @@ 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;
> > @@ -4764,7 +4791,8 @@ 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 1ed86df343a5..25f66a0ed831 100644
> > --- a/fs/f2fs/inode.c
> > +++ b/fs/f2fs/inode.c
> > @@ -372,6 +372,12 @@ 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;
> > + }
> > +
> > return true;
> > }
> > @@ -823,7 +829,8 @@ 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);
> > + if (!IS_DEVICE_ALIASING(inode))
> > + f2fs_destroy_extent_tree(inode);
> > if (inode->i_nlink || is_bad_inode(inode))
> > goto no_delete;
> > @@ -879,6 +886,9 @@ void f2fs_evict_inode(struct inode *inode)
> > goto retry;
> > }
> > + if (IS_DEVICE_ALIASING(inode))
> > + 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 c56e8c873935..e51304bc65ea 100644
> > --- a/fs/f2fs/sysfs.c
> > +++ b/fs/f2fs/sysfs.c
> > @@ -1313,6 +1313,7 @@ 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),
> > @@ -1329,6 +1330,7 @@ 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);
>
Powered by blists - more mailing lists