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Message-Id: <20240813061104.1052-1-youngjin.gil@samsung.com>
Date: Tue, 13 Aug 2024 15:11:04 +0900
From: Yeongjin Gil <youngjin.gil@...sung.com>
To: jaegeuk@...nel.org, chao@...nel.org
Cc: linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
Yeongjin Gil <youngjin.gil@...sung.com>, Sungjong Seo
<sj1557.seo@...sung.com>, Sunmin Jeong <s_min.jeong@...sung.com>, Jaewook
Kim <jw5454.kim@...sung.com>
Subject: [PATCH] f2fs: compress: don't redirty sparse cluster during
{,de}compress
In f2fs_do_write_data_page, when the data block is NULL_ADDR, it skips
writepage considering that it has been already truncated.
This results in an infinite loop as the PAGECACHE_TAG_TOWRITE tag is not
cleared during the writeback process for a compressed file including
NULL_ADDR in compress_mode=user.
This is the reproduction process:
1. dd if=/dev/zero bs=4096 count=1024 seek=1024 of=testfile
2. f2fs_io compress testfile
3. dd if=/dev/zero bs=4096 count=1 conv=notrunc of=testfile
4. f2fs_io decompress testfile
To prevent the problem, let's check whether the cluster is fully
allocated before redirty its pages.
Reviewed-by: Sungjong Seo <sj1557.seo@...sung.com>
Reviewed-by: Sunmin Jeong <s_min.jeong@...sung.com>
Tested-by: Jaewook Kim <jw5454.kim@...sung.com>
Signed-off-by: Yeongjin Gil <youngjin.gil@...sung.com>
---
fs/f2fs/compress.c | 34 ++++++++++++++++++++++++++--------
fs/f2fs/f2fs.h | 12 ++++++++++++
fs/f2fs/file.c | 39 +++++++++++++++++++++------------------
3 files changed, 59 insertions(+), 26 deletions(-)
diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index 990b93689b46..09b91d725807 100644
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -945,7 +945,7 @@ static int __f2fs_get_cluster_blocks(struct inode *inode,
unsigned int cluster_size = F2FS_I(inode)->i_cluster_size;
int count, i;
- for (i = 1, count = 1; i < cluster_size; i++) {
+ for (i = 0, count = 0; i < cluster_size; i++) {
block_t blkaddr = data_blkaddr(dn->inode, dn->node_page,
dn->ofs_in_node + i);
@@ -956,8 +956,8 @@ static int __f2fs_get_cluster_blocks(struct inode *inode,
return count;
}
-static int __f2fs_cluster_blocks(struct inode *inode,
- unsigned int cluster_idx, bool compr_blks)
+static int __f2fs_cluster_blocks(struct inode *inode, unsigned int cluster_idx,
+ enum cluster_check_type type)
{
struct dnode_of_data dn;
unsigned int start_idx = cluster_idx <<
@@ -978,10 +978,12 @@ static int __f2fs_cluster_blocks(struct inode *inode,
}
if (dn.data_blkaddr == COMPRESS_ADDR) {
- if (compr_blks)
- ret = __f2fs_get_cluster_blocks(inode, &dn);
- else
+ if (type == COMPR_BLKS)
+ ret = 1 + __f2fs_get_cluster_blocks(inode, &dn);
+ else if (type == COMPR_CLUSTER)
ret = 1;
+ } else if (type == DECOMPR_BLKS) {
+ ret = __f2fs_get_cluster_blocks(inode, &dn);
}
fail:
f2fs_put_dnode(&dn);
@@ -991,7 +993,14 @@ static int __f2fs_cluster_blocks(struct inode *inode,
/* return # of compressed blocks in compressed cluster */
static int f2fs_compressed_blocks(struct compress_ctx *cc)
{
- return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, true);
+ return __f2fs_cluster_blocks(cc->inode, cc->cluster_idx, COMPR_BLKS);
+}
+
+/* return # of raw blocks in non-compressed cluster */
+static int f2fs_decompressed_blocks(struct inode *inode,
+ unsigned int cluster_idx)
+{
+ return __f2fs_cluster_blocks(inode, cluster_idx, DECOMPR_BLKS);
}
/* return whether cluster is compressed one or not */
@@ -999,7 +1008,16 @@ int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index)
{
return __f2fs_cluster_blocks(inode,
index >> F2FS_I(inode)->i_log_cluster_size,
- false);
+ COMPR_CLUSTER);
+}
+
+/* return whether the cluster is filled with raw blocks */
+bool f2fs_is_non_sparse_cluster(struct inode *inode, pgoff_t index)
+{
+ unsigned int cluster_idx = index >> F2FS_I(inode)->i_log_cluster_size;
+
+ return f2fs_decompressed_blocks(inode, cluster_idx) ==
+ F2FS_I(inode)->i_cluster_size;
}
static bool cluster_may_compress(struct compress_ctx *cc)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 51fd5063a69c..6f26c8cb8857 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -4302,6 +4302,11 @@ static inline bool f2fs_meta_inode_gc_required(struct inode *inode)
* compress.c
*/
#ifdef CONFIG_F2FS_FS_COMPRESSION
+enum cluster_check_type {
+ COMPR_CLUSTER,
+ COMPR_BLKS,
+ DECOMPR_BLKS
+};
bool f2fs_is_compressed_page(struct page *page);
struct page *f2fs_compress_control_page(struct page *page);
int f2fs_prepare_compress_overwrite(struct inode *inode,
@@ -4328,6 +4333,7 @@ int f2fs_write_multi_pages(struct compress_ctx *cc,
struct writeback_control *wbc,
enum iostat_type io_type);
int f2fs_is_compressed_cluster(struct inode *inode, pgoff_t index);
+bool f2fs_is_non_sparse_cluster(struct inode *inode, pgoff_t index);
void f2fs_update_read_extent_tree_range_compressed(struct inode *inode,
pgoff_t fofs, block_t blkaddr,
unsigned int llen, unsigned int c_len);
@@ -4414,6 +4420,12 @@ static inline bool f2fs_load_compressed_page(struct f2fs_sb_info *sbi,
static inline void f2fs_invalidate_compress_pages(struct f2fs_sb_info *sbi,
nid_t ino) { }
#define inc_compr_inode_stat(inode) do { } while (0)
+static inline int f2fs_is_compressed_cluster(
+ struct inode *inode,
+ pgoff_t index) { return 0; }
+static inline bool f2fs_is_non_sparse_cluster(
+ struct inode *inode,
+ pgoff_t index) { return false; }
static inline void f2fs_update_read_extent_tree_range_compressed(
struct inode *inode,
pgoff_t fofs, block_t blkaddr,
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 270c32e3385f..fba8b5f216f9 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -4220,9 +4220,8 @@ static int f2fs_ioc_decompress_file(struct file *filp)
struct inode *inode = file_inode(filp);
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct f2fs_inode_info *fi = F2FS_I(inode);
- pgoff_t page_idx = 0, last_idx;
- int cluster_size = fi->i_cluster_size;
- int count, ret;
+ pgoff_t page_idx = 0, last_idx, cluster_idx;
+ int ret;
if (!f2fs_sb_has_compression(sbi) ||
F2FS_OPTION(sbi).compress_mode != COMPR_MODE_USER)
@@ -4257,10 +4256,15 @@ static int f2fs_ioc_decompress_file(struct file *filp)
goto out;
last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+ last_idx >>= fi->i_log_cluster_size;
+
+ for (cluster_idx = 0; cluster_idx < last_idx; cluster_idx++) {
+ page_idx = cluster_idx << fi->i_log_cluster_size;
+
+ if (!f2fs_is_compressed_cluster(inode, page_idx))
+ continue;
- count = last_idx - page_idx;
- while (count && count >= cluster_size) {
- ret = redirty_blocks(inode, page_idx, cluster_size);
+ ret = redirty_blocks(inode, page_idx, fi->i_cluster_size);
if (ret < 0)
break;
@@ -4270,9 +4274,6 @@ static int f2fs_ioc_decompress_file(struct file *filp)
break;
}
- count -= cluster_size;
- page_idx += cluster_size;
-
cond_resched();
if (fatal_signal_pending(current)) {
ret = -EINTR;
@@ -4299,9 +4300,9 @@ static int f2fs_ioc_compress_file(struct file *filp)
{
struct inode *inode = file_inode(filp);
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
- pgoff_t page_idx = 0, last_idx;
- int cluster_size = F2FS_I(inode)->i_cluster_size;
- int count, ret;
+ struct f2fs_inode_info *fi = F2FS_I(inode);
+ pgoff_t page_idx = 0, last_idx, cluster_idx;
+ int ret;
if (!f2fs_sb_has_compression(sbi) ||
F2FS_OPTION(sbi).compress_mode != COMPR_MODE_USER)
@@ -4335,10 +4336,15 @@ static int f2fs_ioc_compress_file(struct file *filp)
set_inode_flag(inode, FI_ENABLE_COMPRESS);
last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+ last_idx >>= fi->i_log_cluster_size;
- count = last_idx - page_idx;
- while (count && count >= cluster_size) {
- ret = redirty_blocks(inode, page_idx, cluster_size);
+ for (cluster_idx = 0; cluster_idx < last_idx; cluster_idx++) {
+ page_idx = cluster_idx << fi->i_log_cluster_size;
+
+ if (!f2fs_is_non_sparse_cluster(inode, page_idx))
+ continue;
+
+ ret = redirty_blocks(inode, page_idx, fi->i_cluster_size);
if (ret < 0)
break;
@@ -4348,9 +4354,6 @@ static int f2fs_ioc_compress_file(struct file *filp)
break;
}
- count -= cluster_size;
- page_idx += cluster_size;
-
cond_resched();
if (fatal_signal_pending(current)) {
ret = -EINTR;
--
2.40.1
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