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Date: Wed, 12 May 2021 18:11:00 +0800
From: Chao Yu <yuchao0@...wei.com>
To: <jaegeuk@...nel.org>
CC: <linux-f2fs-devel@...ts.sourceforge.net>,
<linux-kernel@...r.kernel.org>, <chao@...nel.org>,
Chao Yu <yuchao0@...wei.com>
Subject: [PATCH RFC] f2fs: support migrating swapfile in aligned write mode
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
*do not merge this patch*, I haven't tested this patch yet, just send this
out for comments.
fs/f2fs/data.c | 117 +++++++++++++++++++++++++++++++++-------------
fs/f2fs/f2fs.h | 1 +
fs/f2fs/node.h | 3 ++
fs/f2fs/segment.c | 3 ++
4 files changed, 92 insertions(+), 32 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 258c5d7a3bfa..ea47d301ccb0 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2472,6 +2472,10 @@ static inline bool check_inplace_update_policy(struct inode *inode,
bool f2fs_should_update_inplace(struct inode *inode, struct f2fs_io_info *fio)
{
+ /* swap file is migrating in algined write mode */
+ if (is_inode_flag_set(inode, FI_ALIGNED_WRITE))
+ return false;
+
if (f2fs_is_pinned_file(inode))
return true;
@@ -3832,6 +3836,70 @@ int f2fs_migrate_page(struct address_space *mapping,
#endif
#ifdef CONFIG_SWAP
+static int f2fs_migrate_blocks(struct inode *inode)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ unsigned int secidx, blkofs;
+ unsigned int blk_per_sec = BLKS_PER_SEC(sbi);
+ unsigned int total_secs = DIV_ROUND_UP(i_size_read(inode),
+ blk_per_sec << F2FS_BLKSIZE_BITS);
+ unsigned int last_blkidx = DIV_ROUND_UP(i_size_read(inode),
+ F2FS_BLKSIZE);
+ int ret = 0;
+
+ down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+ down_write(&F2FS_I(inode)->i_mmap_sem);
+
+ for (secidx = 0; secidx < total_secs; secidx++) {
+ down_write(&sbi->pin_sem);
+
+ f2fs_lock_op(sbi);
+ f2fs_allocate_new_section(sbi, CURSEG_COLD_DATA_PINNED, false);
+ f2fs_unlock_op(sbi);
+
+ set_inode_flag(inode, FI_DO_DEFRAG);
+
+ for (blkofs = 0; blkofs < blk_per_sec; blkofs++) {
+ struct page *page;
+ unsigned int blkidx = secidx * blk_per_sec + blkofs;
+
+ if (blkidx >= last_blkidx) {
+ up_write(&sbi->pin_sem);
+ goto done;
+ }
+
+ page = f2fs_get_lock_data_page(inode, blkidx, true);
+ if (IS_ERR(page)) {
+ up_write(&sbi->pin_sem);
+ ret = PTR_ERR(page);
+ goto done;
+ }
+
+ set_page_dirty(page);
+ f2fs_put_page(page, 1);
+ }
+
+ clear_inode_flag(inode, FI_DO_DEFRAG);
+
+ set_inode_flag(inode, FI_ALIGNED_WRITE);
+ ret = filemap_fdatawrite(inode->i_mapping);
+ clear_inode_flag(inode, FI_ALIGNED_WRITE);
+
+ up_write(&sbi->pin_sem);
+
+ if (ret)
+ break;
+ }
+
+done:
+ clear_inode_flag(inode, FI_DO_DEFRAG);
+
+ up_write(&F2FS_I(inode)->i_mmap_sem);
+ up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+
+ return ret;
+}
+
static int f2fs_is_file_aligned(struct inode *inode)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
@@ -3841,7 +3909,6 @@ static int f2fs_is_file_aligned(struct inode *inode)
block_t pblock;
unsigned long nr_pblocks;
unsigned int blocks_per_sec = BLKS_PER_SEC(sbi);
- unsigned int not_aligned = 0;
int ret = 0;
cur_lblock = 0;
@@ -3874,20 +3941,12 @@ static int f2fs_is_file_aligned(struct inode *inode)
if ((pblock - main_blkaddr) & (blocks_per_sec - 1) ||
nr_pblocks & (blocks_per_sec - 1)) {
- if (f2fs_is_pinned_file(inode)) {
- f2fs_err(sbi, "Swapfile does not align to section");
- ret = -EINVAL;
- goto out;
- }
- not_aligned++;
+ ret = FILE_NOT_ALIGNED;
+ goto out;
}
cur_lblock += nr_pblocks;
}
- if (not_aligned)
- f2fs_warn(sbi, "Swapfile (%u) is not align to section: \n"
- "\t1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate()",
- not_aligned);
out:
return ret;
}
@@ -3905,8 +3964,6 @@ static int check_swap_activate_fast(struct swap_info_struct *sis,
sector_t highest_pblock = 0;
int nr_extents = 0;
unsigned long nr_pblocks;
- unsigned int blocks_per_sec = BLKS_PER_SEC(sbi);
- unsigned int not_aligned = 0;
int ret = 0;
/*
@@ -3943,16 +4000,6 @@ static int check_swap_activate_fast(struct swap_info_struct *sis,
pblock = map.m_pblk;
nr_pblocks = map.m_len;
- if ((pblock - SM_I(sbi)->main_blkaddr) & (blocks_per_sec - 1) ||
- nr_pblocks & (blocks_per_sec - 1)) {
- if (f2fs_is_pinned_file(inode)) {
- f2fs_err(sbi, "Swapfile does not align to section");
- ret = -EINVAL;
- goto out;
- }
- not_aligned++;
- }
-
if (cur_lblock + nr_pblocks >= sis->max)
nr_pblocks = sis->max - cur_lblock;
@@ -3979,11 +4026,6 @@ static int check_swap_activate_fast(struct swap_info_struct *sis,
sis->max = cur_lblock;
sis->pages = cur_lblock - 1;
sis->highest_bit = cur_lblock - 1;
-
- if (not_aligned)
- f2fs_warn(sbi, "Swapfile (%u) is not align to section: \n"
- "\t1) creat(), 2) ioctl(F2FS_IOC_SET_PIN_FILE), 3) fallocate()",
- not_aligned);
out:
return ret;
}
@@ -4003,13 +4045,24 @@ static int check_swap_activate(struct swap_info_struct *sis,
sector_t highest_block = 0;
int nr_extents = 0;
int ret = 0;
+ bool migrated = false;
- if (PAGE_SIZE == F2FS_BLKSIZE)
- return check_swap_activate_fast(sis, swap_file, span);
-
+recheck:
ret = f2fs_is_file_aligned(inode);
- if (ret)
+ if (ret < 0)
goto out;
+ else if (ret == FILE_NOT_ALIGNED) {
+ if (migrated)
+ return -EINVAL;
+ ret = f2fs_migrate_blocks(inode);
+ if (ret)
+ return ret;
+ migrated = true;
+ goto recheck;
+ }
+
+ if (PAGE_SIZE == F2FS_BLKSIZE)
+ return check_swap_activate_fast(sis, swap_file, span);
blocks_per_page = bytes_to_blks(inode, PAGE_SIZE);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 70c0bd563732..570ffdf068ee 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -707,6 +707,7 @@ enum {
FI_COMPRESS_CORRUPT, /* indicate compressed cluster is corrupted */
FI_MMAP_FILE, /* indicate file was mmapped */
FI_ENABLE_COMPRESS, /* enable compression in "user" compression mode */
+ FI_ALIGNED_WRITE, /* enable aligned write */
FI_MAX, /* max flag, never be used */
};
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
index d85e8659cfda..e5235dfe4670 100644
--- a/fs/f2fs/node.h
+++ b/fs/f2fs/node.h
@@ -38,6 +38,9 @@
/* return value for read_node_page */
#define LOCKED_PAGE 1
+/* check pinned file's alignment status of physical blocks */
+#define FILE_NOT_ALIGNED 1
+
/* For flag in struct node_info */
enum {
IS_CHECKPOINTED, /* is it checkpointed before? */
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 72c75694c9c5..edc3a28970a4 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3292,6 +3292,9 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)
if (fio->type == DATA) {
struct inode *inode = fio->page->mapping->host;
+ if (is_inode_flag_set(inode, FI_ALIGNED_WRITE))
+ return CURSEG_COLD_DATA_PINNED;
+
if (page_private_gcing(fio->page)) {
if (fio->sbi->am.atgc_enabled &&
(fio->io_type == FS_DATA_IO) &&
--
2.29.2
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