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Subject[PATCH 1/6] f2fs: spread struct f2fs_dentry_ptr for inline path
Date
From: Chao Yu <yuchao0@huawei.com>

Use f2fs_dentry_ptr structure to indicate inline dentry structure as
much as possible, so we can wrap inline dentry with size-fixed fields
to the one with size-changeable fields. With this change, we can
handle size-changeable inline dentry more easily.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/f2fs.h | 5 ++++-
fs/f2fs/inline.c | 47 ++++++++++++++++++++++++++---------------------
2 files changed, 30 insertions(+), 22 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 42c39f0bfd88..23f117e4aeb8 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -361,10 +361,11 @@ struct f2fs_flush_device {
/* for directory operations */
struct f2fs_dentry_ptr {
struct inode *inode;
- const void *bitmap;
+ void *bitmap;
struct f2fs_dir_entry *dentry;
__u8 (*filename)[F2FS_SLOT_LEN];
int max;
+ int nr_bitmap;
};

static inline void make_dentry_ptr_block(struct inode *inode,
@@ -372,6 +373,7 @@ static inline void make_dentry_ptr_block(struct inode *inode,
{
d->inode = inode;
d->max = NR_DENTRY_IN_BLOCK;
+ d->nr_bitmap = SIZE_OF_DENTRY_BITMAP;
d->bitmap = &t->dentry_bitmap;
d->dentry = t->dentry;
d->filename = t->filename;
@@ -382,6 +384,7 @@ static inline void make_dentry_ptr_inline(struct inode *inode,
{
d->inode = inode;
d->max = NR_INLINE_DENTRY;
+ d->nr_bitmap = INLINE_DENTRY_BITMAP_SIZE;
d->bitmap = &t->dentry_bitmap;
d->dentry = t->dentry;
d->filename = t->filename;
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index e0fd4376e6fb..2082816a504a 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -342,6 +342,7 @@ static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,
struct page *page;
struct dnode_of_data dn;
struct f2fs_dentry_block *dentry_blk;
+ struct f2fs_dentry_ptr src, dst;
int err;

page = f2fs_grab_cache_page(dir->i_mapping, 0, false);
@@ -360,21 +361,20 @@ static int f2fs_move_inline_dirents(struct inode *dir, struct page *ipage,

dentry_blk = kmap_atomic(page);

+ make_dentry_ptr_inline(NULL, &src, inline_dentry);
+ make_dentry_ptr_block(NULL, &dst, dentry_blk);
+
/* copy data from inline dentry block to new dentry block */
- memcpy(dentry_blk->dentry_bitmap, inline_dentry->dentry_bitmap,
- INLINE_DENTRY_BITMAP_SIZE);
- memset(dentry_blk->dentry_bitmap + INLINE_DENTRY_BITMAP_SIZE, 0,
- SIZE_OF_DENTRY_BITMAP - INLINE_DENTRY_BITMAP_SIZE);
+ memcpy(dst.bitmap, src.bitmap, src.nr_bitmap);
+ memset(dst.bitmap + src.nr_bitmap, 0, dst.nr_bitmap - src.nr_bitmap);
/*
* we do not need to zero out remainder part of dentry and filename
* field, since we have used bitmap for marking the usage status of
* them, besides, we can also ignore copying/zeroing reserved space
* of dentry block, because them haven't been used so far.
*/
- memcpy(dentry_blk->dentry, inline_dentry->dentry,
- sizeof(struct f2fs_dir_entry) * NR_INLINE_DENTRY);
- memcpy(dentry_blk->filename, inline_dentry->filename,
- NR_INLINE_DENTRY * F2FS_SLOT_LEN);
+ memcpy(dst.dentry, src.dentry, SIZE_OF_DIR_ENTRY * src.max);
+ memcpy(dst.filename, src.filename, src.max * F2FS_SLOT_LEN);

kunmap_atomic(dentry_blk);
if (!PageUptodate(page))
@@ -511,9 +511,10 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
return PTR_ERR(ipage);

inline_dentry = inline_data_addr(ipage);
- bit_pos = room_for_filename(&inline_dentry->dentry_bitmap,
- slots, NR_INLINE_DENTRY);
- if (bit_pos >= NR_INLINE_DENTRY) {
+ make_dentry_ptr_inline(NULL, &d, inline_dentry);
+
+ bit_pos = room_for_filename(d.bitmap, slots, d.max);
+ if (bit_pos >= d.max) {
err = f2fs_convert_inline_dir(dir, ipage, inline_dentry);
if (err)
return err;
@@ -534,7 +535,6 @@ int f2fs_add_inline_entry(struct inode *dir, const struct qstr *new_name,
f2fs_wait_on_page_writeback(ipage, NODE, true);

name_hash = f2fs_dentry_hash(new_name, NULL);
- make_dentry_ptr_inline(NULL, &d, inline_dentry);
f2fs_update_dentry(ino, mode, &d, new_name, name_hash, bit_pos);

set_page_dirty(ipage);
@@ -558,6 +558,7 @@ void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
struct inode *dir, struct inode *inode)
{
struct f2fs_inline_dentry *inline_dentry;
+ struct f2fs_dentry_ptr d;
int slots = GET_DENTRY_SLOTS(le16_to_cpu(dentry->name_len));
unsigned int bit_pos;
int i;
@@ -566,10 +567,11 @@ void f2fs_delete_inline_entry(struct f2fs_dir_entry *dentry, struct page *page,
f2fs_wait_on_page_writeback(page, NODE, true);

inline_dentry = inline_data_addr(page);
- bit_pos = dentry - inline_dentry->dentry;
+ make_dentry_ptr_inline(NULL, &d, inline_dentry);
+
+ bit_pos = dentry - d.dentry;
for (i = 0; i < slots; i++)
- __clear_bit_le(bit_pos + i,
- &inline_dentry->dentry_bitmap);
+ __clear_bit_le(bit_pos + i, d.bitmap);

set_page_dirty(page);
f2fs_put_page(page, 1);
@@ -587,19 +589,20 @@ bool f2fs_empty_inline_dir(struct inode *dir)
struct page *ipage;
unsigned int bit_pos = 2;
struct f2fs_inline_dentry *inline_dentry;
+ struct f2fs_dentry_ptr d;

ipage = get_node_page(sbi, dir->i_ino);
if (IS_ERR(ipage))
return false;

inline_dentry = inline_data_addr(ipage);
- bit_pos = find_next_bit_le(&inline_dentry->dentry_bitmap,
- NR_INLINE_DENTRY,
- bit_pos);
+ make_dentry_ptr_inline(NULL, &d, inline_dentry);
+
+ bit_pos = find_next_bit_le(d.bitmap, d.max, bit_pos);

f2fs_put_page(ipage, 1);

- if (bit_pos < NR_INLINE_DENTRY)
+ if (bit_pos < d.max)
return false;

return true;
@@ -614,7 +617,9 @@ int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,
struct f2fs_dentry_ptr d;
int err;

- if (ctx->pos == NR_INLINE_DENTRY)
+ make_dentry_ptr_inline(inode, &d, inline_dentry);
+
+ if (ctx->pos == d.max)
return 0;

ipage = get_node_page(F2FS_I_SB(inode), inode->i_ino);
@@ -627,7 +632,7 @@ int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx,

err = f2fs_fill_dentries(ctx, &d, 0, fstr);
if (!err)
- ctx->pos = NR_INLINE_DENTRY;
+ ctx->pos = d.max;

f2fs_put_page(ipage, 1);
return err < 0 ? err : 0;
--
2.13.0.90.g1eb437020
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