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Date: Thu, 23 Sep 2021 22:35:45 +0800
From: Gao Xiang <xiang@...nel.org>
To: Chao Yu <chao@...nel.org>
Cc: Gao Xiang <hsiangkao@...ux.alibaba.com>,
linux-erofs@...ts.ozlabs.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] erofs: clean up erofs_map_blocks tracepoints
Hi Chao,
On Thu, Sep 23, 2021 at 10:13:23PM +0800, Chao Yu wrote:
> On 2021/9/21 22:35, Gao Xiang wrote:
> > Since the new type of chunk-based files is introduced, there is no
> > need to leave flatmode tracepoints. Rename to erofs_map_blocks.
> >
> > Add the missing FIEMAP tracepoint map flag as well.
> >
> > Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>
> > ---
> > fs/erofs/data.c | 31 ++++++++++++++-----------------
> > include/trace/events/erofs.h | 7 ++++---
> > 2 files changed, 18 insertions(+), 20 deletions(-)
> >
> > diff --git a/fs/erofs/data.c b/fs/erofs/data.c
> > index 9db8297..020c3e0 100644
> > --- a/fs/erofs/data.c
> > +++ b/fs/erofs/data.c
> > @@ -26,14 +26,11 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
> > struct erofs_map_blocks *map,
> > int flags)
> > {
> > - int err = 0;
> > erofs_blk_t nblocks, lastblk;
> > u64 offset = map->m_la;
> > struct erofs_inode *vi = EROFS_I(inode);
> > bool tailendpacking = (vi->datalayout == EROFS_INODE_FLAT_INLINE);
> > - trace_erofs_map_blocks_flatmode_enter(inode, map, flags);
> > -
> > nblocks = DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
> > lastblk = nblocks - tailendpacking;
> > @@ -57,8 +54,7 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
> > "inline data cross block boundary @ nid %llu",
> > vi->nid);
> > DBG_BUGON(1);
> > - err = -EFSCORRUPTED;
> > - goto err_out;
> > + return -EFSCORRUPTED;
> > }
> > map->m_flags |= EROFS_MAP_META;
> > @@ -67,14 +63,10 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
> > "internal error @ nid: %llu (size %llu), m_la 0x%llx",
> > vi->nid, inode->i_size, map->m_la);
> > DBG_BUGON(1);
> > - err = -EIO;
> > - goto err_out;
> > + return -EIO;
> > }
> > -
> > map->m_llen = map->m_plen;
> > -err_out:
> > - trace_erofs_map_blocks_flatmode_exit(inode, map, flags, 0);
> > - return err;
> > + return 0;
> > }
> > static int erofs_map_blocks(struct inode *inode,
> > @@ -89,6 +81,7 @@ static int erofs_map_blocks(struct inode *inode,
> > erofs_off_t pos;
> > int err = 0;
> > + trace_erofs_map_blocks_enter(inode, map, flags);
> > if (map->m_la >= inode->i_size) {
> > /* leave out-of-bound access unmapped */
> > map->m_flags = 0;
> > @@ -96,8 +89,10 @@ static int erofs_map_blocks(struct inode *inode,
>
> map->m_flags = 0;
> map->m_plen = 0;
>
> It needs to reset map->m_llen to zero here like we did after 'out' label before?
Yeah, thanks for catching that! I will fix it in the next version
(PATCH 2/2 will be delayed for 5.16...)
p.s. I might need to apply the following patches for 5.15 cycle in
advance, could you help review these as well? Many thanks!
1. erofs: fix misbehavior of unsupported chunk format check
2. erofs: fix compacted_2b if compacted_4b_initial > totalidx
Thanks,
Gao Xiang
>
> Thanks,
>
> > goto out;
> > }
> > - if (vi->datalayout != EROFS_INODE_CHUNK_BASED)
> > - return erofs_map_blocks_flatmode(inode, map, flags);
> > + if (vi->datalayout != EROFS_INODE_CHUNK_BASED) {
> > + err = erofs_map_blocks_flatmode(inode, map, flags);
> > + goto out;
> > + }
> > if (vi->chunkformat & EROFS_CHUNK_FORMAT_INDEXES)
> > unit = sizeof(*idx); /* chunk index */
> > @@ -109,9 +104,10 @@ static int erofs_map_blocks(struct inode *inode,
> > vi->xattr_isize, unit) + unit * chunknr;
> > page = erofs_get_meta_page(inode->i_sb, erofs_blknr(pos));
> > - if (IS_ERR(page))
> > - return PTR_ERR(page);
> > -
> > + if (IS_ERR(page)) {
> > + err = PTR_ERR(page);
> > + goto out;
> > + }
> > map->m_la = chunknr << vi->chunkbits;
> > map->m_plen = min_t(erofs_off_t, 1UL << vi->chunkbits,
> > roundup(inode->i_size - map->m_la, EROFS_BLKSIZ));
> > @@ -147,11 +143,12 @@ static int erofs_map_blocks(struct inode *inode,
> > map->m_flags = EROFS_MAP_MAPPED;
> > break;
> > }
> > + map->m_llen = map->m_plen;
> > out_unlock:
> > unlock_page(page);
> > put_page(page);
> > out:
> > - map->m_llen = map->m_plen;
> > + trace_erofs_map_blocks_exit(inode, map, flags, 0);
> > return err;
> > }
> > diff --git a/include/trace/events/erofs.h b/include/trace/events/erofs.h
> > index db4f2ce..5c91edd 100644
> > --- a/include/trace/events/erofs.h
> > +++ b/include/trace/events/erofs.h
> > @@ -19,7 +19,8 @@
> > { 1, "DIR" })
> > #define show_map_flags(flags) __print_flags(flags, "|", \
> > - { EROFS_GET_BLOCKS_RAW, "RAW" })
> > + { EROFS_GET_BLOCKS_RAW, "RAW" }, \
> > + { EROFS_GET_BLOCKS_FIEMAP, "FIEMAP" })
> > #define show_mflags(flags) __print_flags(flags, "", \
> > { EROFS_MAP_MAPPED, "M" }, \
> > @@ -169,7 +170,7 @@
> > __entry->flags ? show_map_flags(__entry->flags) : "NULL")
> > );
> > -DEFINE_EVENT(erofs__map_blocks_enter, erofs_map_blocks_flatmode_enter,
> > +DEFINE_EVENT(erofs__map_blocks_enter, erofs_map_blocks_enter,
> > TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
> > unsigned flags),
> > @@ -221,7 +222,7 @@
> > show_mflags(__entry->mflags), __entry->ret)
> > );
> > -DEFINE_EVENT(erofs__map_blocks_exit, erofs_map_blocks_flatmode_exit,
> > +DEFINE_EVENT(erofs__map_blocks_exit, erofs_map_blocks_exit,
> > TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
> > unsigned flags, int ret),
> >
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