linux-kernel - [PATCH 2/2] erofs: clean up erofs_map

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210921143531.81356-2-hsiangkao@linux.alibaba.com>
Date:   Tue, 21 Sep 2021 22:35:31 +0800
From:   Gao Xiang <hsiangkao@...ux.alibaba.com>
To:     linux-erofs@...ts.ozlabs.org, Chao Yu <chao@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Gao Xiang <hsiangkao@...ux.alibaba.com>
Subject: [PATCH 2/2] erofs: clean up erofs_map_blocks tracepoints

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,
 		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),
 
-- 
1.8.3.1