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Date: Tue, 18 Feb 2020 18:21:35 +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 2/3] f2fs: fix to avoid triggering IO in write path
If we are in write IO path, we need to avoid using GFP_KERNEL.
Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
fs/f2fs/compress.c | 2 +-
fs/f2fs/data.c | 24 +++++++++++++-----------
fs/f2fs/f2fs.h | 2 +-
3 files changed, 15 insertions(+), 13 deletions(-)
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index b9ea531ffbb6..b1bc057ee266 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -653,7 +653,7 @@ static int prepare_compress_overwrite(struct compress_ctx *cc,
struct bio *bio = NULL;
ret = f2fs_read_multi_pages(cc, &bio, cc->cluster_size,
- &last_block_in_bio, false);
+ &last_block_in_bio, false, true);
f2fs_destroy_compress_ctx(cc);
if (ret)
goto release_pages;
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 3a4ece26928c..716277d6be48 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -924,14 +924,15 @@ static inline bool f2fs_need_verity(const struct inode *inode, pgoff_t idx)
static struct bio *f2fs_grab_read_bio(struct inode *inode, block_t blkaddr,
unsigned nr_pages, unsigned op_flag,
- pgoff_t first_idx)
+ pgoff_t first_idx, bool for_write)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct bio *bio;
struct bio_post_read_ctx *ctx;
unsigned int post_read_steps = 0;
- bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES), false);
+ bio = f2fs_bio_alloc(sbi, min_t(int, nr_pages, BIO_MAX_PAGES),
+ for_write);
if (!bio)
return ERR_PTR(-ENOMEM);
f2fs_target_device(sbi, blkaddr, bio);
@@ -966,12 +967,12 @@ static void f2fs_release_read_bio(struct bio *bio)
/* This can handle encryption stuffs */
static int f2fs_submit_page_read(struct inode *inode, struct page *page,
- block_t blkaddr)
+ block_t blkaddr, bool for_write)
{
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct bio *bio;
- bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0, page->index);
+ bio = f2fs_grab_read_bio(inode, blkaddr, 1, 0, page->index, for_write);
if (IS_ERR(bio))
return PTR_ERR(bio);
@@ -1157,7 +1158,7 @@ struct page *f2fs_get_read_data_page(struct inode *inode, pgoff_t index,
return page;
}
- err = f2fs_submit_page_read(inode, page, dn.data_blkaddr);
+ err = f2fs_submit_page_read(inode, page, dn.data_blkaddr, for_write);
if (err)
goto put_err;
return page;
@@ -1974,7 +1975,8 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
}
if (bio == NULL) {
bio = f2fs_grab_read_bio(inode, block_nr, nr_pages,
- is_readahead ? REQ_RAHEAD : 0, page->index);
+ is_readahead ? REQ_RAHEAD : 0, page->index,
+ false);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
bio = NULL;
@@ -2009,7 +2011,7 @@ static int f2fs_read_single_page(struct inode *inode, struct page *page,
#ifdef CONFIG_F2FS_FS_COMPRESSION
int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
unsigned nr_pages, sector_t *last_block_in_bio,
- bool is_readahead)
+ bool is_readahead, bool for_write)
{
struct dnode_of_data dn;
struct inode *inode = cc->inode;
@@ -2103,7 +2105,7 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
if (!bio) {
bio = f2fs_grab_read_bio(inode, blkaddr, nr_pages,
is_readahead ? REQ_RAHEAD : 0,
- page->index);
+ page->index, for_write);
if (IS_ERR(bio)) {
ret = PTR_ERR(bio);
bio = NULL;
@@ -2208,7 +2210,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
ret = f2fs_read_multi_pages(&cc, &bio,
max_nr_pages,
&last_block_in_bio,
- is_readahead);
+ is_readahead, false);
f2fs_destroy_compress_ctx(&cc);
if (ret)
goto set_error_page;
@@ -2251,7 +2253,7 @@ int f2fs_mpage_readpages(struct address_space *mapping,
ret = f2fs_read_multi_pages(&cc, &bio,
max_nr_pages,
&last_block_in_bio,
- is_readahead);
+ is_readahead, false);
f2fs_destroy_compress_ctx(&cc);
}
}
@@ -3291,7 +3293,7 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
err = -EFSCORRUPTED;
goto fail;
}
- err = f2fs_submit_page_read(inode, page, blkaddr);
+ err = f2fs_submit_page_read(inode, page, blkaddr, true);
if (err)
goto fail;
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 65f569949d42..5d047c0bbbbb 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3799,7 +3799,7 @@ int f2fs_write_multi_pages(struct compress_ctx *cc,
int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index);
int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
unsigned nr_pages, sector_t *last_block_in_bio,
- bool is_readahead);
+ bool is_readahead, bool for_write);
struct decompress_io_ctx *f2fs_alloc_dic(struct compress_ctx *cc);
void f2fs_free_dic(struct decompress_io_ctx *dic);
void f2fs_decompress_end_io(struct page **rpages,
--
2.18.0.rc1
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