[PATCH 09/11] f2fs: introduce f2fs_dentry_ptr structure for code clean-up

From: Jaegeuk Kim
Date: Mon Oct 20 2014 - 01:20:07 EST

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This patch introduces f2fs_dentry_ptr structure for the use of a function
parameter in inline_dentry operations.

Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
---
fs/f2fs/dir.c | 61 +++++++++++++++++++++++++++-----------------------------
fs/f2fs/f2fs.h | 34 ++++++++++++++++++++++++++-----
fs/f2fs/inline.c | 18 ++++++++---------
3 files changed, 67 insertions(+), 46 deletions(-)

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 721d061..80665ce 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -95,13 +95,13 @@ static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
{
struct f2fs_dentry_block *dentry_blk;
struct f2fs_dir_entry *de;
-
- *max_slots = NR_DENTRY_IN_BLOCK;
+ struct f2fs_dentry_ptr d;

dentry_blk = (struct f2fs_dentry_block *)kmap(dentry_page);
- de = find_target_dentry(name, max_slots, &dentry_blk->dentry_bitmap,
- dentry_blk->dentry,
- dentry_blk->filename);
+
+ make_dentry_ptr(&d, dentry_blk, NULL, 1);
+ de = find_target_dentry(name, max_slots, &d);
+
kunmap(dentry_page);
if (de)
*res_page = dentry_page;
@@ -110,50 +110,49 @@ static struct f2fs_dir_entry *find_in_block(struct page *dentry_page,
* For the most part, it should be a bug when name_len is zero.
* We stop here for figuring out where the bugs has occurred.
*/
- f2fs_bug_on(F2FS_P_SB(dentry_page), *max_slots < 0);
+ f2fs_bug_on(F2FS_P_SB(dentry_page), d.max < 0);
return de;
}

struct f2fs_dir_entry *find_target_dentry(struct qstr *name, int *max_slots,
- const void *bitmap, struct f2fs_dir_entry *dentry,
- __u8 (*filenames)[F2FS_SLOT_LEN])
+ struct f2fs_dentry_ptr *d)
{
struct f2fs_dir_entry *de;
unsigned long bit_pos = 0;
f2fs_hash_t namehash = f2fs_dentry_hash(name);
- int max_bits = *max_slots;
int max_len = 0;

- *max_slots = 0;
- while (bit_pos < max_bits) {
- if (!test_bit_le(bit_pos, bitmap)) {
+ if (max_slots)
+ *max_slots = 0;
+ while (bit_pos < d->max) {
+ if (!test_bit_le(bit_pos, d->bitmap)) {
if (bit_pos == 0)
max_len = 1;
- else if (!test_bit_le(bit_pos - 1, bitmap))
+ else if (!test_bit_le(bit_pos - 1, d->bitmap))
max_len++;
bit_pos++;
continue;
}
- de = &dentry[bit_pos];
+ de = &d->dentry[bit_pos];
if (early_match_name(name->len, namehash, de) &&
- !memcmp(filenames[bit_pos], name->name, name->len))
+ !memcmp(d->filename[bit_pos], name->name, name->len))
goto found;

- if (*max_slots >= 0 && max_len > *max_slots) {
+ if (max_slots && *max_slots >= 0 && max_len > *max_slots) {
*max_slots = max_len;
max_len = 0;
}

/* remain bug on condition */
if (unlikely(!de->name_len))
- *max_slots = -1;
+ d->max = -1;

bit_pos += GET_DENTRY_SLOTS(le16_to_cpu(de->name_len));
}

de = NULL;
found:
- if (max_len > *max_slots)
+ if (max_slots && max_len > *max_slots)
*max_slots = max_len;
return de;
}
@@ -705,28 +704,26 @@ bool f2fs_empty_dir(struct inode *dir)
return true;
}

-bool f2fs_fill_dentries(struct dir_context *ctx,
- const void *bitmap, struct f2fs_dir_entry *dentry,
- __u8 (*filenames)[F2FS_SLOT_LEN], int max,
- unsigned int start_pos)
+bool f2fs_fill_dentries(struct dir_context *ctx, struct f2fs_dentry_ptr *d,
+ unsigned int start_pos)
{
unsigned char d_type = DT_UNKNOWN;
unsigned int bit_pos;
struct f2fs_dir_entry *de = NULL;

- bit_pos = ((unsigned long)ctx->pos % max);
+ bit_pos = ((unsigned long)ctx->pos % d->max);

- while (bit_pos < max) {
- bit_pos = find_next_bit_le(bitmap, max, bit_pos);
- if (bit_pos >= max)
+ while (bit_pos < d->max) {
+ bit_pos = find_next_bit_le(d->bitmap, d->max, bit_pos);
+ if (bit_pos >= d->max)
break;

- de = &dentry[bit_pos];
+ de = &d->dentry[bit_pos];
if (de->file_type < F2FS_FT_MAX)
d_type = f2fs_filetype_table[de->file_type];
else
d_type = DT_UNKNOWN;
- if (!dir_emit(ctx, filenames[bit_pos],
+ if (!dir_emit(ctx, d->filename[bit_pos],
le16_to_cpu(de->name_len),
le32_to_cpu(de->ino), d_type))
return true;
@@ -745,6 +742,7 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)
struct page *dentry_page = NULL;
struct file_ra_state *ra = &file->f_ra;
unsigned int n = ((unsigned long)ctx->pos / NR_DENTRY_IN_BLOCK);
+ struct f2fs_dentry_ptr d;

if (f2fs_has_inline_dentry(inode))
return f2fs_read_inline_dir(file, ctx);
@@ -761,10 +759,9 @@ static int f2fs_readdir(struct file *file, struct dir_context *ctx)

dentry_blk = kmap(dentry_page);

- if (f2fs_fill_dentries(ctx,
- &dentry_blk->dentry_bitmap, dentry_blk->dentry,
- dentry_blk->filename,
- NR_DENTRY_IN_BLOCK, n * NR_DENTRY_IN_BLOCK))
+ make_dentry_ptr(&d, dentry_blk, NULL, 1);
+
+ if (f2fs_fill_dentries(ctx, &d, n * NR_DENTRY_IN_BLOCK))
goto stop;

ctx->pos = (n + 1) * NR_DENTRY_IN_BLOCK;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 3b0f490..0856a38 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -212,6 +212,31 @@ static inline bool __has_cursum_space(struct f2fs_summary_block *sum, int size,
/*
* For INODE and NODE manager
*/
+/* for directory operations */
+struct f2fs_dentry_ptr {
+ const void *bitmap;
+ struct f2fs_dir_entry *dentry;
+ __u8 (*filename)[F2FS_SLOT_LEN];
+ int max;
+};
+
+static inline void make_dentry_ptr(struct f2fs_dentry_ptr *d,
+ struct f2fs_dentry_block *d1,
+ struct f2fs_inline_dentry *d2, int type)
+{
+ if (type == 1) {
+ d->max = NR_DENTRY_IN_BLOCK;
+ d->bitmap = &d1->dentry_bitmap;
+ d->dentry = d1->dentry;
+ d->filename = d1->filename;
+ } else {
+ d->max = NR_INLINE_DENTRY;
+ d->bitmap = &d2->dentry_bitmap;
+ d->dentry = d2->dentry;
+ d->filename = d2->filename;
+ }
+}
+
/*
* XATTR_NODE_OFFSET stores xattrs to one node block per file keeping -1
* as its node offset to distinguish from index node blocks.
@@ -1245,11 +1270,10 @@ struct dentry *f2fs_get_parent(struct dentry *child);
*/
extern unsigned char f2fs_filetype_table[F2FS_FT_MAX];
void set_de_type(struct f2fs_dir_entry *, struct inode *);
-struct f2fs_dir_entry *find_target_dentry(struct qstr *, int *, const void *,
- struct f2fs_dir_entry *, __u8 (*)[F2FS_SLOT_LEN]);
-bool f2fs_fill_dentries(struct dir_context *,
- const void *, struct f2fs_dir_entry *,
- __u8 (*)[F2FS_SLOT_LEN], int, unsigned int);
+struct f2fs_dir_entry *find_target_dentry(struct qstr *, int *,
+ struct f2fs_dentry_ptr *);
+bool f2fs_fill_dentries(struct dir_context *, struct f2fs_dentry_ptr *,
+ unsigned int);
struct page *init_inode_metadata(struct inode *, struct inode *,
const struct qstr *, struct page *);
void update_parent_metadata(struct inode *, struct inode *, unsigned int);
diff --git a/fs/f2fs/inline.c b/fs/f2fs/inline.c
index 403c8f7..edacfa1 100644
--- a/fs/f2fs/inline.c
+++ b/fs/f2fs/inline.c
@@ -265,8 +265,8 @@ struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
struct f2fs_inline_dentry *inline_dentry;
struct f2fs_dir_entry *de;
+ struct f2fs_dentry_ptr d;
struct page *ipage;
- int max_slots = NR_INLINE_DENTRY;

ipage = get_node_page(sbi, dir->i_ino);
if (IS_ERR(ipage))
@@ -274,9 +274,9 @@ struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,

inline_dentry = inline_data_addr(ipage);

- de = find_target_dentry(name, &max_slots, &inline_dentry->dentry_bitmap,
- inline_dentry->dentry,
- inline_dentry->filename);
+ make_dentry_ptr(&d, NULL, inline_dentry, 2);
+ de = find_target_dentry(name, NULL, &d);
+
unlock_page(ipage);
if (de)
*res_page = ipage;
@@ -287,7 +287,7 @@ struct f2fs_dir_entry *find_in_inline_dir(struct inode *dir,
* For the most part, it should be a bug when name_len is zero.
* We stop here for figuring out where the bugs has occurred.
*/
- f2fs_bug_on(sbi, max_slots < 0);
+ f2fs_bug_on(sbi, d.max < 0);
return de;
}

@@ -521,6 +521,7 @@ int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)
struct inode *inode = file_inode(file);
struct f2fs_inline_dentry *inline_dentry = NULL;
struct page *ipage = NULL;
+ struct f2fs_dentry_ptr d;

if (ctx->pos == NR_INLINE_DENTRY)
return 0;
@@ -531,10 +532,9 @@ int f2fs_read_inline_dir(struct file *file, struct dir_context *ctx)

inline_dentry = inline_data_addr(ipage);

- if (!f2fs_fill_dentries(ctx, &inline_dentry->dentry_bitmap,
- inline_dentry->dentry,
- inline_dentry->filename,
- NR_INLINE_DENTRY, 0))
+ make_dentry_ptr(&d, NULL, inline_dentry, 2);
+
+ if (!f2fs_fill_dentries(ctx, &d, 0))
ctx->pos = NR_INLINE_DENTRY;

f2fs_put_page(ipage, 1);
--
2.1.1

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