[PATCH 1/3] f2fs: fix to initialize i_current_depth according to inode type

[Chao Yu]

i_current_depth is used only for directory inode, but its space is
shared with i_gc_failures field used for regular inode, in order to
avoid affecting i_gc_failures' value, this patch fixes to initialize
the union's fields according to inode type.

Signed-off-by: Chao Yu <yuch...@huawei.com>
---
 fs/f2fs/inode.c | 12 +++++++++---
 fs/f2fs/namei.c |  3 +++
 fs/f2fs/super.c |  1 -
 3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 7f2fe4574c48..3a74a1cf3264 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -232,8 +232,10 @@ static int do_read_inode(struct inode *inode)
        inode->i_ctime.tv_nsec = le32_to_cpu(ri->i_ctime_nsec);
        inode->i_mtime.tv_nsec = le32_to_cpu(ri->i_mtime_nsec);
        inode->i_generation = le32_to_cpu(ri->i_generation);
-
-       fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
+       if (S_ISDIR(inode->i_mode))
+               fi->i_current_depth = le32_to_cpu(ri->i_current_depth);
+       else if (S_ISREG(inode->i_mode))
+               fi->i_gc_failures = le16_to_cpu(ri->i_gc_failures);
        fi->i_xattr_nid = le32_to_cpu(ri->i_xattr_nid);
        fi->i_flags = le32_to_cpu(ri->i_flags);
        fi->flags = 0;
@@ -422,7 +424,11 @@ void update_inode(struct inode *inode, struct page 
*node_page)
        ri->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
        ri->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
        ri->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
-       ri->i_current_depth = cpu_to_le32(F2FS_I(inode)->i_current_depth);
+       if (S_ISDIR(inode->i_mode))
+               ri->i_current_depth =
+                       cpu_to_le32(F2FS_I(inode)->i_current_depth);
+       else if (S_ISREG(inode->i_mode))
+               ri->i_gc_failures = cpu_to_le16(F2FS_I(inode)->i_gc_failures);
        ri->i_xattr_nid = cpu_to_le32(F2FS_I(inode)->i_xattr_nid);
        ri->i_flags = cpu_to_le32(F2FS_I(inode)->i_flags);
        ri->i_pino = cpu_to_le32(F2FS_I(inode)->i_pino);
diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index fef6e3ab2135..bcfc4219b29e 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -54,6 +54,9 @@ static struct inode *f2fs_new_inode(struct inode *dir, 
umode_t mode)
                        F2FS_I(inode)->i_crtime = current_time(inode);
        inode->i_generation = sbi->s_next_generation++;
 
+       if (S_ISDIR(inode->i_mode))
+               F2FS_I(inode)->i_current_depth = 1;
+
        err = insert_inode_locked(inode);
        if (err) {
                err = -EINVAL;
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index c8e5fe5d71fe..8e5f0a178f5d 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -826,7 +826,6 @@ static struct inode *f2fs_alloc_inode(struct super_block 
*sb)
 
        /* Initialize f2fs-specific inode info */
        atomic_set(&fi->dirty_pages, 0);
-       fi->i_current_depth = 1;
        init_rwsem(&fi->i_sem);
        INIT_LIST_HEAD(&fi->dirty_list);
        INIT_LIST_HEAD(&fi->gdirty_list);
-- 
2.17.0.391.g1f1cddd558b5