[linux-yocto] [PATCH 1/1] yaffs2: Add patch to fix missing checkpoint

2015-12-10 Thread zhe.he 
From: He Zhe 

Signed-off-by: He Zhe 
---
 .../yaffs2-fix-missing-checkpoint-on-yaffs.patch   | 85 ++
 features/yaffs2/yaffs2.scc |  1 +
 2 files changed, 86 insertions(+)
 create mode 100644 features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch

diff --git a/features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch 
b/features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch
new file mode 100644
index 000..cd7cc58
--- /dev/null
+++ b/features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch
@@ -0,0 +1,85 @@
+From fcdadf7cdb9659c76808ff5fc2f105c56436e6a8 Mon Sep 17 00:00:00 2001
+From: He Zhe 
+Date: Wed, 2 Dec 2015 01:31:31 -0500
+Subject: [PATCH] fs/yaffs2: fix missing checkpoint on yaffs
+
+For yaffs file system, the mode of reading or writing is restricted at
+four pointer where are mnt->mnt_flags,mnt->mnt_sb->s_flags,mtd->flags
+and dev->read_only,the first three is used handle file and file
+system(eg,remount) operation, and last one(dev->read_only) almost is used
+handle checkpoint of yaffs2. However, in current code, the dev->read_only
+only can be changed at first time when the yaffs2 file system is mounted,
+later it can't be changed again(eg,mount -o remount), the result is that
+the checkpoint's saving operation always can't succeed if you set readonly
+mode for yaffs2 file system when it is mounted at the first time.
+
+To fix this issue, we implement yaffs_remount_fs() which allows the
+rootfs to be remounted as r/w.
+
+Signed-off-by: Wenlin Kang 
+Signed-off-by: He Zhe 
+---
+ fs/yaffs2/yaffs_vfs.c | 39 +++
+ 1 file changed, 39 insertions(+)
+
+diff --git a/fs/yaffs2/yaffs_vfs.c b/fs/yaffs2/yaffs_vfs.c
+index 52177c1..16251d5 100644
+--- a/fs/yaffs2/yaffs_vfs.c
 b/fs/yaffs2/yaffs_vfs.c
+@@ -2614,7 +2614,45 @@ static int yaffs_sync_fs(struct super_block *sb)
+   return 0;
+ }
+ 
++/* the function only is used to change dev->read_only when this file system
++ * is remounted.
++ */
++static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
++{
++  int read_only = 0;
++  struct mtd_info *mtd;
++  struct yaffs_dev *dev = 0;
++
++  /* Get the device */
++  mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
++  if (!mtd) {
++  yaffs_trace(YAFFS_TRACE_ALWAYS,
++  "MTD device #%u doesn't appear to exist",
++  MINOR(sb->s_dev));
++  return 1;
++  }
+ 
++  /* Check it's NAND */
++  if (mtd->type != MTD_NANDFLASH) {
++  yaffs_trace(YAFFS_TRACE_ALWAYS,
++  "MTD device is not NAND it's type %d",
++  mtd->type);
++  return 1;
++  }
++
++  read_only = ((*flags & MS_RDONLY) != 0);
++  if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
++  read_only = 1;
++  printk(KERN_INFO
++ "yaffs: mtd is read only, setting superblock read only");
++  *flags |= MS_RDONLY;
++  }
++
++  dev = sb->s_fs_info;
++  dev->read_only = read_only;
++
++  return 0;
++}
+ 
+ static const struct super_operations yaffs_super_ops = {
+   .statfs = yaffs_statfs,
+@@ -2636,6 +2674,7 @@ static const struct super_operations yaffs_super_ops = {
+ #ifdef YAFFS_HAS_WRITE_SUPER
+   .write_super = yaffs_write_super,
+ #endif
++  .remount_fs = yaffs_remount_fs,
+ };
+ 
+ struct yaffs_options {
+-- 
+1.9.1
+
diff --git a/features/yaffs2/yaffs2.scc b/features/yaffs2/yaffs2.scc
index 2026f71..07e2653 100644
--- a/features/yaffs2/yaffs2.scc
+++ b/features/yaffs2/yaffs2.scc
@@ -13,3 +13,4 @@ patch 
yaffs2-switch-simple-generic_file_aio_read-users-to-.patch
 patch yaffs2-use-write_iter-variants-of-__-generic_file_ai.patch
 patch yaffs2-implement-splice_write-via-write_iter.patch
 patch yaffs2-fix-memory-leak-in-mount-umount.patch
+patch yaffs2-fix-missing-checkpoint-on-yaffs.patch
-- 
2.3.5

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[linux-yocto] [PATCH 1/1] yaffs2: Add patch to fix missing checkpoint

2015-12-10 Thread zhe.he 
From: He Zhe 

Signed-off-by: He Zhe 
---
 .../yaffs2-fix-missing-checkpoint-on-yaffs.patch   | 85 ++
 features/yaffs2/yaffs2.scc |  1 +
 2 files changed, 86 insertions(+)
 create mode 100644 features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch

diff --git a/features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch 
b/features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch
new file mode 100644
index 000..cd7cc58
--- /dev/null
+++ b/features/yaffs2/yaffs2-fix-missing-checkpoint-on-yaffs.patch
@@ -0,0 +1,85 @@
+From fcdadf7cdb9659c76808ff5fc2f105c56436e6a8 Mon Sep 17 00:00:00 2001
+From: He Zhe 
+Date: Wed, 2 Dec 2015 01:31:31 -0500
+Subject: [PATCH] fs/yaffs2: fix missing checkpoint on yaffs
+
+For yaffs file system, the mode of reading or writing is restricted at
+four pointer where are mnt->mnt_flags,mnt->mnt_sb->s_flags,mtd->flags
+and dev->read_only,the first three is used handle file and file
+system(eg,remount) operation, and last one(dev->read_only) almost is used
+handle checkpoint of yaffs2. However, in current code, the dev->read_only
+only can be changed at first time when the yaffs2 file system is mounted,
+later it can't be changed again(eg,mount -o remount), the result is that
+the checkpoint's saving operation always can't succeed if you set readonly
+mode for yaffs2 file system when it is mounted at the first time.
+
+To fix this issue, we implement yaffs_remount_fs() which allows the
+rootfs to be remounted as r/w.
+
+Signed-off-by: Wenlin Kang 
+Signed-off-by: He Zhe 
+---
+ fs/yaffs2/yaffs_vfs.c | 39 +++
+ 1 file changed, 39 insertions(+)
+
+diff --git a/fs/yaffs2/yaffs_vfs.c b/fs/yaffs2/yaffs_vfs.c
+index 52177c1..16251d5 100644
+--- a/fs/yaffs2/yaffs_vfs.c
 b/fs/yaffs2/yaffs_vfs.c
+@@ -2614,7 +2614,45 @@ static int yaffs_sync_fs(struct super_block *sb)
+   return 0;
+ }
+ 
++/* the function only is used to change dev->read_only when this file system
++ * is remounted.
++ */
++static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
++{
++  int read_only = 0;
++  struct mtd_info *mtd;
++  struct yaffs_dev *dev = 0;
++
++  /* Get the device */
++  mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
++  if (!mtd) {
++  yaffs_trace(YAFFS_TRACE_ALWAYS,
++  "MTD device #%u doesn't appear to exist",
++  MINOR(sb->s_dev));
++  return 1;
++  }
+ 
++  /* Check it's NAND */
++  if (mtd->type != MTD_NANDFLASH) {
++  yaffs_trace(YAFFS_TRACE_ALWAYS,
++  "MTD device is not NAND it's type %d",
++  mtd->type);
++  return 1;
++  }
++
++  read_only = ((*flags & MS_RDONLY) != 0);
++  if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
++  read_only = 1;
++  printk(KERN_INFO
++ "yaffs: mtd is read only, setting superblock read only");
++  *flags |= MS_RDONLY;
++  }
++
++  dev = sb->s_fs_info;
++  dev->read_only = read_only;
++
++  return 0;
++}
+ 
+ static const struct super_operations yaffs_super_ops = {
+   .statfs = yaffs_statfs,
+@@ -2636,6 +2674,7 @@ static const struct super_operations yaffs_super_ops = {
+ #ifdef YAFFS_HAS_WRITE_SUPER
+   .write_super = yaffs_write_super,
+ #endif
++  .remount_fs = yaffs_remount_fs,
+ };
+ 
+ struct yaffs_options {
+-- 
+1.9.1
+
diff --git a/features/yaffs2/yaffs2.scc b/features/yaffs2/yaffs2.scc
index 7e54fdb..077c238 100644
--- a/features/yaffs2/yaffs2.scc
+++ b/features/yaffs2/yaffs2.scc
@@ -16,3 +16,4 @@ patch yaffs2-fix-memory-leak-in-mount-umount.patch
 patch yaffs2-replace-f_dentry-to-f_path.dentry.patch
 patch yaffs2-remove-read-and-write-methods.patch
 patch fs-yaffs2-Fix-a-judgement-logic-for-ACL-operations.patch
+patch yaffs2-fix-missing-checkpoint-on-yaffs.patch
-- 
2.3.5

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