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Subject[RFC PATHC 2/2] f2fs: apply write hints to select the type of segment for direct write
Date
From: Hyunchul Lee <cheol.lee@lge.com>

Select the type of the segment using write hints, when blocks are
allocated for direct write.

There are unhandled corner cases. Hints are not applied in
in-place update. And if the blocks of a file is not pre-allocated
because of the invalid user buffer, CURSEG_WARM_DATA segment will
be selected.

Signed-off-by: Hyunchul Lee <cheol.lee@lge.com>
---
fs/f2fs/data.c | 101 ++++++++++++++++++++++++++++++++++-----------------------
fs/f2fs/f2fs.h | 1 +
2 files changed, 61 insertions(+), 41 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 36b5352..d06048a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -783,7 +783,7 @@ struct page *get_new_data_page(struct inode *inode,
return page;
}

-static int __allocate_data_block(struct dnode_of_data *dn)
+static int __allocate_data_block(struct dnode_of_data *dn, int seg_type)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
struct f2fs_summary sum;
@@ -808,7 +808,7 @@ static int __allocate_data_block(struct dnode_of_data *dn)
set_summary(&sum, dn->nid, dn->ofs_in_node, ni.version);

allocate_data_block(sbi, NULL, dn->data_blkaddr, &dn->data_blkaddr,
- &sum, CURSEG_WARM_DATA, NULL, false);
+ &sum, seg_type, NULL, false);
set_data_blkaddr(dn);

/* update i_size */
@@ -827,42 +827,6 @@ static inline bool __force_buffered_io(struct inode *inode, int rw)
F2FS_I_SB(inode)->s_ndevs);
}

-int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
-{
- struct inode *inode = file_inode(iocb->ki_filp);
- struct f2fs_map_blocks map;
- int err = 0;
-
- if (is_inode_flag_set(inode, FI_NO_PREALLOC))
- return 0;
-
- map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos);
- map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from));
- if (map.m_len > map.m_lblk)
- map.m_len -= map.m_lblk;
- else
- map.m_len = 0;
-
- map.m_next_pgofs = NULL;
-
- if (iocb->ki_flags & IOCB_DIRECT) {
- err = f2fs_convert_inline_inode(inode);
- if (err)
- return err;
- return f2fs_map_blocks(inode, &map, 1,
- __force_buffered_io(inode, WRITE) ?
- F2FS_GET_BLOCK_PRE_AIO :
- F2FS_GET_BLOCK_PRE_DIO);
- }
- if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) {
- err = f2fs_convert_inline_inode(inode);
- if (err)
- return err;
- }
- if (!f2fs_has_inline_data(inode))
- return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
- return err;
-}

static inline void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
{
@@ -888,8 +852,8 @@ static inline void __do_map_lock(struct f2fs_sb_info *sbi, int flag, bool lock)
* b. do not use extent cache for better performance
* c. give the block addresses to blockdev
*/
-int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
- int create, int flag)
+static int __f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
+ int create, int flag, int seg_type)
{
unsigned int maxblocks = map->m_len;
struct dnode_of_data dn;
@@ -957,7 +921,12 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
last_ofs_in_node = dn.ofs_in_node;
}
} else {
- err = __allocate_data_block(&dn);
+ /* if this inode is marked with FI_NO_PREALLOC,
+ * @seg_type is NO_CHECK_TYPE
+ */
+ if (seg_type == NO_CHECK_TYPE)
+ seg_type = CURSEG_WARM_DATA;
+ err = __allocate_data_block(&dn, seg_type);
if (!err)
set_inode_flag(inode, FI_APPEND_WRITE);
}
@@ -1048,6 +1017,51 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
return err;
}

+int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
+ int create, int flag)
+{
+ return __f2fs_map_blocks(inode, map, create, flag, NO_CHECK_TYPE);
+}
+
+int f2fs_preallocate_blocks(struct kiocb *iocb, struct iov_iter *from)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ struct f2fs_map_blocks map;
+ int err = 0;
+
+ if (is_inode_flag_set(inode, FI_NO_PREALLOC))
+ return 0;
+
+ map.m_lblk = F2FS_BLK_ALIGN(iocb->ki_pos);
+ map.m_len = F2FS_BYTES_TO_BLK(iocb->ki_pos + iov_iter_count(from));
+ if (map.m_len > map.m_lblk)
+ map.m_len -= map.m_lblk;
+ else
+ map.m_len = 0;
+
+ map.m_next_pgofs = NULL;
+
+ if (iocb->ki_flags & IOCB_DIRECT) {
+ err = f2fs_convert_inline_inode(inode);
+ if (err)
+ return err;
+ return __f2fs_map_blocks(inode, &map, 1,
+ __force_buffered_io(inode, WRITE) ?
+ F2FS_GET_BLOCK_PRE_AIO :
+ F2FS_GET_BLOCK_PRE_DIO,
+ rw_hint_to_seg_type(iocb->ki_hint));
+ }
+ if (iocb->ki_pos + iov_iter_count(from) > MAX_INLINE_DATA(inode)) {
+ err = f2fs_convert_inline_inode(inode);
+ if (err)
+ return err;
+ }
+ if (!f2fs_has_inline_data(inode))
+ return f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
+
+ return err;
+}
+
static int __get_data_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh, int create, int flag,
pgoff_t *next_pgofs)
@@ -2082,6 +2096,11 @@ static ssize_t f2fs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)

trace_f2fs_direct_IO_enter(inode, offset, count, rw);

+ /* This is for avoiding the situation that the data of a segment is
+ * passed down to devices with different hints
+ */
+ iocb->ki_hint = WRITE_LIFE_NOT_SET;
+
down_read(&F2FS_I(inode)->dio_rwsem[rw]);
err = blockdev_direct_IO(iocb, inode, iter, get_data_block_dio);
up_read(&F2FS_I(inode)->dio_rwsem[rw]);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4b4a72f..9be5658 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -2562,6 +2562,7 @@ int lookup_journal_in_cursum(struct f2fs_journal *journal, int type,
void destroy_segment_manager(struct f2fs_sb_info *sbi);
int __init create_segment_manager_caches(void);
void destroy_segment_manager_caches(void);
+int rw_hint_to_seg_type(enum rw_hint hint);

/*
* checkpoint.c
--
1.9.1
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