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Subject[PATCH 1/2] f2fs: support aligned pinned file
Date
This patch supports 2MB-aligned pinned file, which can guarantee no GC at all
by allocating fully valid 2MB segment.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
fs/f2fs/f2fs.h | 4 +++-
fs/f2fs/file.c | 39 ++++++++++++++++++++++++++++++++++-----
fs/f2fs/recovery.c | 2 +-
fs/f2fs/segment.c | 21 ++++++++++++++++++++-
fs/f2fs/segment.h | 2 ++
fs/f2fs/super.c | 1 +
fs/f2fs/sysfs.c | 2 ++
7 files changed, 63 insertions(+), 8 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index ca342f4c7db1..c681f51e351b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -890,6 +890,7 @@ enum {
CURSEG_WARM_NODE, /* direct node blocks of normal files */
CURSEG_COLD_NODE, /* indirect node blocks */
NO_CHECK_TYPE,
+ CURSEG_COLD_DATA_PINNED,/* cold data for pinned file */
};

struct flush_cmd {
@@ -1301,6 +1302,7 @@ struct f2fs_sb_info {

/* threshold for gc trials on pinned files */
u64 gc_pin_file_threshold;
+ struct rw_semaphore pin_sem;

/* maximum # of trials to find a victim segment for SSR and GC */
unsigned int max_victim_search;
@@ -3116,7 +3118,7 @@ void f2fs_release_discard_addrs(struct f2fs_sb_info *sbi);
int f2fs_npages_for_summary_flush(struct f2fs_sb_info *sbi, bool for_ra);
void allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
unsigned int start, unsigned int end);
-void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi);
+void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi, int type);
int f2fs_trim_fs(struct f2fs_sb_info *sbi, struct fstrim_range *range);
bool f2fs_exist_trim_candidates(struct f2fs_sb_info *sbi,
struct cp_control *cpc);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 29bc0a542759..f6c038e8a6a7 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1545,12 +1545,41 @@ static int expand_inode_data(struct inode *inode, loff_t offset,
if (off_end)
map.m_len++;

- if (f2fs_is_pinned_file(inode))
- map.m_seg_type = CURSEG_COLD_DATA;
+ if (!map.m_len)
+ return 0;
+
+ if (f2fs_is_pinned_file(inode)) {
+ block_t len = (map.m_len >> sbi->log_blocks_per_seg) <<
+ sbi->log_blocks_per_seg;
+ block_t done = 0;
+
+ if (map.m_len % sbi->blocks_per_seg)
+ len += sbi->blocks_per_seg;

- err = f2fs_map_blocks(inode, &map, 1, (f2fs_is_pinned_file(inode) ?
- F2FS_GET_BLOCK_PRE_DIO :
- F2FS_GET_BLOCK_PRE_AIO));
+ map.m_len = sbi->blocks_per_seg;
+next_alloc:
+ mutex_lock(&sbi->gc_mutex);
+ err = f2fs_gc(sbi, true, false, NULL_SEGNO);
+ if (err && err != -ENODATA && err != -EAGAIN)
+ goto out_err;
+
+ down_write(&sbi->pin_sem);
+ map.m_seg_type = CURSEG_COLD_DATA_PINNED;
+ f2fs_allocate_new_segments(sbi, CURSEG_COLD_DATA);
+ err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_DIO);
+ up_write(&sbi->pin_sem);
+
+ done += map.m_len;
+ len -= map.m_len;
+ map.m_lblk += map.m_len;
+ if (!err && len)
+ goto next_alloc;
+
+ map.m_len = done;
+ } else {
+ err = f2fs_map_blocks(inode, &map, 1, F2FS_GET_BLOCK_PRE_AIO);
+ }
+out_err:
if (err) {
pgoff_t last_off;

diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 783773e4560d..76477f71d4ee 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -711,7 +711,7 @@ static int recover_data(struct f2fs_sb_info *sbi, struct list_head *inode_list,
f2fs_put_page(page, 1);
}
if (!err)
- f2fs_allocate_new_segments(sbi);
+ f2fs_allocate_new_segments(sbi, NO_CHECK_TYPE);
return err;
}

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 25c750cd0272..253d72c2663c 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2690,7 +2690,7 @@ void allocate_segment_for_resize(struct f2fs_sb_info *sbi, int type,
up_read(&SM_I(sbi)->curseg_lock);
}

-void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
+void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi, int type)
{
struct curseg_info *curseg;
unsigned int old_segno;
@@ -2699,6 +2699,9 @@ void f2fs_allocate_new_segments(struct f2fs_sb_info *sbi)
down_write(&SIT_I(sbi)->sentry_lock);

for (i = CURSEG_HOT_DATA; i <= CURSEG_COLD_DATA; i++) {
+ if (type != NO_CHECK_TYPE && i != type)
+ continue;
+
curseg = CURSEG_I(sbi, i);
old_segno = curseg->segno;
SIT_I(sbi)->s_ops->allocate_segment(sbi, i, true);
@@ -3068,6 +3071,19 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
{
struct sit_info *sit_i = SIT_I(sbi);
struct curseg_info *curseg = CURSEG_I(sbi, type);
+ bool put_pin_sem = false;
+
+ if (type == CURSEG_COLD_DATA) {
+ /* GC during CURSEG_COLD_DATA_PINNED allocation */
+ if (down_read_trylock(&sbi->pin_sem)) {
+ put_pin_sem = true;
+ } else {
+ type = CURSEG_WARM_DATA;
+ curseg = CURSEG_I(sbi, type);
+ }
+ } else if (type == CURSEG_COLD_DATA_PINNED) {
+ type = CURSEG_COLD_DATA;
+ }

down_read(&SM_I(sbi)->curseg_lock);

@@ -3133,6 +3149,9 @@ void f2fs_allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
mutex_unlock(&curseg->curseg_mutex);

up_read(&SM_I(sbi)->curseg_lock);
+
+ if (put_pin_sem)
+ up_read(&sbi->pin_sem);
}

static void update_device_state(struct f2fs_io_info *fio)
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 325781a1ae4d..a95467b202ea 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -313,6 +313,8 @@ struct sit_entry_set {
*/
static inline struct curseg_info *CURSEG_I(struct f2fs_sb_info *sbi, int type)
{
+ if (type == CURSEG_COLD_DATA_PINNED)
+ type = CURSEG_COLD_DATA;
return (struct curseg_info *)(SM_I(sbi)->curseg_array + type);
}

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index f320fd11db48..c02a47ce551b 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -2853,6 +2853,7 @@ static void init_sb_info(struct f2fs_sb_info *sbi)
spin_lock_init(&sbi->dev_lock);

init_rwsem(&sbi->sb_lock);
+ init_rwsem(&sbi->pin_sem);
}

static int init_percpu_info(struct f2fs_sb_info *sbi)
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index b558b64a4c9c..f164959e4224 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -154,6 +154,8 @@ static ssize_t features_show(struct f2fs_attr *a,
if (f2fs_sb_has_casefold(sbi))
len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
len ? ", " : "", "casefold");
+ len += snprintf(buf + len, PAGE_SIZE - len, "%s%s",
+ len ? ", " : "", "pin_file");
len += snprintf(buf + len, PAGE_SIZE - len, "\n");
return len;
}
--
2.19.0.605.g01d371f741-goog
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