[PATCH 5/6] jffs2: rename CONFIG_JFFS2_FS_WBUF_VERIFY to CONFIG_JFFS2_FS_WRITE_VERIFY

[zhouminqiang]

Write verification now covers all write paths including NOR direct
writes and write-buffer direct page writes, not just the write-buffer
flush path. The Kconfig option also no longer depends on
CONFIG_JFFS2_FS_WRITEBUFFER.

Rename the option from CONFIG_JFFS2_FS_WBUF_VERIFY to
CONFIG_JFFS2_FS_WRITE_VERIFY to reflect its broader scope and
independence from the write-buffer configuration.

Signed-off-by: zhouminqiang <zhouminqiang2 at huawei.com>
---
 fs/jffs2/Kconfig    | 23 ++++++++++++++++++-----
 fs/jffs2/os-linux.h |  2 +-
 fs/jffs2/writev.c   |  4 ++--
 3 files changed, 21 insertions(+), 8 deletions(-)

diff --git a/fs/jffs2/Kconfig b/fs/jffs2/Kconfig
index 560187d61562..556025a5d438 100644
--- a/fs/jffs2/Kconfig
+++ b/fs/jffs2/Kconfig
@@ -42,13 +42,26 @@ config JFFS2_FS_WRITEBUFFER
 	    - NOR flash with transparent ECC
 	    - DataFlash
 
-config JFFS2_FS_WBUF_VERIFY
-	bool "Verify JFFS2 write-buffer reads"
-	depends on JFFS2_FS_WRITEBUFFER
+config JFFS2_FS_WRITE_VERIFY
+	bool "Verify JFFS2 writes"
+	depends on JFFS2_FS
 	default n
 	help
-	  This causes JFFS2 to read back every page written through the
-	  write-buffer, and check for errors.
+	  Read back data immediately after flash writes and compare it
+	  with the in-memory image that was written. This covers both
+	  write-buffer flushes and direct writes to non-writebuffered
+	  devices.
+
+	  This may catch corruption introduced after node CRCs are
+	  calculated but before/while data is transferred to the flash
+	  controller (e.g. RAM or DMA), where mtd_write() may succeed
+	  while the medium does not match what JFFS2 intended.
+
+	  Without an immediate read-back, a later node CRC failure cannot
+	  tell transport/program-time corruption from post-commit media
+	  damage.
+
+	  If unsure, say 'N'.
 
 config JFFS2_SUMMARY
 	bool "JFFS2 summary support"
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index e73ef643fd97..65604a6f8148 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -192,7 +192,7 @@ int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
 int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
 			size_t *retlen, const u_char *buf);
 
-#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+#ifdef CONFIG_JFFS2_FS_WRITE_VERIFY
 int jffs2_verify_write(struct jffs2_sb_info *c, const unsigned char *buf,
 		       uint32_t ofs, size_t len);
 int jffs2_verify_writev(struct jffs2_sb_info *c,
diff --git a/fs/jffs2/writev.c b/fs/jffs2/writev.c
index 39adc15ffd69..fc1eae60c476 100644
--- a/fs/jffs2/writev.c
+++ b/fs/jffs2/writev.c
@@ -14,7 +14,7 @@
 #include <linux/mtd/mtd.h>
 #include "nodelist.h"
 
-#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+#ifdef CONFIG_JFFS2_FS_WRITE_VERIFY
 int jffs2_verify_write(struct jffs2_sb_info *c, const unsigned char *buf,
 			      uint32_t ofs, size_t len)
 {
@@ -98,7 +98,7 @@ int jffs2_verify_writev(struct jffs2_sb_info *c,
 	}
 	return 0;
 }
-#endif /* CONFIG_JFFS2_FS_WBUF_VERIFY */
+#endif /* CONFIG_JFFS2_FS_WRITE_VERIFY */
 
 int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
 			      unsigned long count, loff_t to, size_t *retlen)
-- 
2.52.0