Re: [f2fs-dev] [PATCH 1/6] f2fs: specify extent cache for read explicitly

Chao Yu
2022-12-09T01:32:04Z

On 2022/12/9 1:29, Jaegeuk Kim wrote:
> On 12/08, Chao Yu wrote:
>> On 2022/12/6 2:54, Jaegeuk Kim wrote:
>>> Let's descrbie it's read extent cache.
>>>
>>> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
>>> ---
>>> fs/f2fs/extent_cache.c | 4 ++--
>>> fs/f2fs/f2fs.h | 10 +++++-----
>>> fs/f2fs/inode.c | 2 +-
>>> fs/f2fs/node.c | 2 +-
>>> fs/f2fs/node.h | 2 +-
>>> fs/f2fs/segment.c | 4 ++--
>>> fs/f2fs/super.c | 16 ++++++++--------
>>> 7 files changed, 20 insertions(+), 20 deletions(-)
>>>
>>> diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
>>> index 932c070173b9..8cd87aee0292 100644
>>> --- a/fs/f2fs/extent_cache.c
>>> +++ b/fs/f2fs/extent_cache.c
>>> @@ -383,7 +383,7 @@ static void __f2fs_init_extent_tree(struct inode *inode, struct page *ipage)
>>> if (!i_ext || !i_ext->len)
>>> return;
>>> - get_extent_info(&ei, i_ext);
>>> + get_read_extent_info(&ei, i_ext);
>>> write_lock(&et->lock);
>>> if (atomic_read(&et->node_cnt))
>>> @@ -710,7 +710,7 @@ unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
>>> unsigned int node_cnt = 0, tree_cnt = 0;
>>> int remained;
>>> - if (!test_opt(sbi, EXTENT_CACHE))
>>> + if (!test_opt(sbi, READ_EXTENT_CACHE))
>>> return 0;
>>> if (!atomic_read(&sbi->total_zombie_tree))
>>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>>> index eb8c27c4e5fc..1c39f8145b61 100644
>>> --- a/fs/f2fs/f2fs.h
>>> +++ b/fs/f2fs/f2fs.h
>>> @@ -92,7 +92,7 @@ extern const char *f2fs_fault_name[FAULT_MAX];
>>> #define F2FS_MOUNT_FLUSH_MERGE 0x00000400
>>> #define F2FS_MOUNT_NOBARRIER 0x00000800
>>> #define F2FS_MOUNT_FASTBOOT 0x00001000
>>> -#define F2FS_MOUNT_EXTENT_CACHE 0x00002000
>>> +#define F2FS_MOUNT_READ_EXTENT_CACHE 0x00002000
>>> #define F2FS_MOUNT_DATA_FLUSH 0x00008000
>>> #define F2FS_MOUNT_FAULT_INJECTION 0x00010000
>>> #define F2FS_MOUNT_USRQUOTA 0x00080000
>>> @@ -600,7 +600,7 @@ enum {
>>> #define F2FS_MIN_EXTENT_LEN 64 /* minimum extent length */
>>> /* number of extent info in extent cache we try to shrink */
>>> -#define EXTENT_CACHE_SHRINK_NUMBER 128
>>> +#define READ_EXTENT_CACHE_SHRINK_NUMBER 128
>>> #define RECOVERY_MAX_RA_BLOCKS BIO_MAX_VECS
>>> #define RECOVERY_MIN_RA_BLOCKS 1
>>> @@ -830,7 +830,7 @@ struct f2fs_inode_info {
>>> loff_t original_i_size; /* original i_size before atomic write */
>>> };
>>> -static inline void get_extent_info(struct extent_info *ext,
>>> +static inline void get_read_extent_info(struct extent_info *ext,
>>> struct f2fs_extent *i_ext)
>>> {
>>> ext->fofs = le32_to_cpu(i_ext->fofs);
>>> @@ -838,7 +838,7 @@ static inline void get_extent_info(struct extent_info *ext,
>>> ext->len = le32_to_cpu(i_ext->len);
>>> }
>>> -static inline void set_raw_extent(struct extent_info *ext,
>>> +static inline void set_raw_read_extent(struct extent_info *ext,
>>> struct f2fs_extent *i_ext)
>>> {
>>> i_ext->fofs = cpu_to_le32(ext->fofs);
>>> @@ -4407,7 +4407,7 @@ static inline bool f2fs_may_extent_tree(struct inode *inode)
>>> {
>>> struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
>>> - if (!test_opt(sbi, EXTENT_CACHE) ||
>>> + if (!test_opt(sbi, READ_EXTENT_CACHE) ||
>>> is_inode_flag_set(inode, FI_NO_EXTENT) ||
>>> (is_inode_flag_set(inode, FI_COMPRESSED_FILE) &&
>>> !f2fs_sb_has_readonly(sbi)))
>>> diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
>>> index 577f109b4e1d..2c705c60019b 100644
>>> --- a/fs/f2fs/inode.c
>>> +++ b/fs/f2fs/inode.c
>>> @@ -629,7 +629,7 @@ void f2fs_update_inode(struct inode *inode, struct page *node_page)
>>> if (et) {
>>> read_lock(&et->lock);
>>> - set_raw_extent(&et->largest, &ri->i_ext);
>>> + set_raw_read_extent(&et->largest, &ri->i_ext);
>>> read_unlock(&et->lock);
>>> } else {
>>> memset(&ri->i_ext, 0, sizeof(ri->i_ext));
>>> diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
>>> index b9ee5a1176a0..84b147966080 100644
>>> --- a/fs/f2fs/node.c
>>> +++ b/fs/f2fs/node.c
>>> @@ -85,7 +85,7 @@ bool f2fs_available_free_memory(struct f2fs_sb_info *sbi, int type)
>>> sizeof(struct ino_entry);
>>> mem_size >>= PAGE_SHIFT;
>>> res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1);
>>> - } else if (type == EXTENT_CACHE) {
>>> + } else if (type == READ_EXTENT_CACHE) {
>>> mem_size = (atomic_read(&sbi->total_ext_tree) *
>>> sizeof(struct extent_tree) +
>>> atomic_read(&sbi->total_ext_node) *
>>> diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h
>>> index 3c09cae058b0..0aa48704c77a 100644
>>> --- a/fs/f2fs/node.h
>>> +++ b/fs/f2fs/node.h
>>> @@ -146,7 +146,7 @@ enum mem_type {
>>> NAT_ENTRIES, /* indicates the cached nat entry */
>>> DIRTY_DENTS, /* indicates dirty dentry pages */
>>> INO_ENTRIES, /* indicates inode entries */
>>> - EXTENT_CACHE, /* indicates extent cache */
>>> + READ_EXTENT_CACHE, /* indicates read extent cache */
>>> DISCARD_CACHE, /* indicates memory of cached discard cmds */
>>> COMPRESS_PAGE, /* indicates memory of cached compressed pages */
>>> BASE_CHECK, /* check kernel status */
>>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>>> index 9486ca49ecb1..51de358bc452 100644
>>> --- a/fs/f2fs/segment.c
>>> +++ b/fs/f2fs/segment.c
>>> @@ -449,8 +449,8 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg)
>>> return;
>>> /* try to shrink extent cache when there is no enough memory */
>>> - if (!f2fs_available_free_memory(sbi, EXTENT_CACHE))
>>> - f2fs_shrink_extent_tree(sbi, EXTENT_CACHE_SHRINK_NUMBER);
>>> + if (!f2fs_available_free_memory(sbi, READ_EXTENT_CACHE))
>>> + f2fs_shrink_extent_tree(sbi, READ_EXTENT_CACHE_SHRINK_NUMBER);
>>> /* check the # of cached NAT entries */
>>> if (!f2fs_available_free_memory(sbi, NAT_ENTRIES))
>>> diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
>>> index 79bf1faf4161..10bd03bbefec 100644
>>> --- a/fs/f2fs/super.c
>>> +++ b/fs/f2fs/super.c
>>> @@ -814,10 +814,10 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
>>> set_opt(sbi, FASTBOOT);
>>> break;
>>> case Opt_extent_cache:
>>> - set_opt(sbi, EXTENT_CACHE);
>>> + set_opt(sbi, READ_EXTENT_CACHE);
>>> break;
>>> case Opt_noextent_cache:
>>> - clear_opt(sbi, EXTENT_CACHE);
>>> + clear_opt(sbi, READ_EXTENT_CACHE);
>>> break;
>>> case Opt_noinline_data:
>>> clear_opt(sbi, INLINE_DATA);
>>> @@ -1954,10 +1954,10 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
>>> seq_puts(seq, ",barrier");
>>> if (test_opt(sbi, FASTBOOT))
>>> seq_puts(seq, ",fastboot");
>>> - if (test_opt(sbi, EXTENT_CACHE))
>>> - seq_puts(seq, ",extent_cache");
>>> + if (test_opt(sbi, READ_EXTENT_CACHE))
>>> + seq_puts(seq, ",read_extent_cache");
>>
>> How about keeping consistent w/ description of f2fs.rst?
>
> This doesn't change the mount options, but do show the exact name which
> would be better to say what's going on.

mount -t f2fs /dev/vda /mnt/f2fs
mount|grep f2fs
/dev/vda on /mnt/f2fs type f2fs (rw,relatime,lazytime,background_gc=on,discard,no_heap,user_xattr,inline_xattr,acl,inline_data,inline_dentry,flush_merge,barrier,read_extent_cache,mode=adaptive,active_logs=6,alloc_mode=reuse,check)

mount -t f2fs -o remount /mnt/f2fs/
[ 63.142480] F2FS-fs (vda): Unrecognized mount option "read_extent_cache" or missing value

Quoted from manual of mount

"mount -o remount,rw /dir

After this call, mount reads fstab and merges these options with the options
from the command line (-o). If no mountpoint is found in fstab, then a
remount with unspecified source is allowed."

I guess above command tries to use previous mountoptions which were read
via .show_options().

Thanks,

>
>>
>>> else
>>> - seq_puts(seq, ",noextent_cache");
>>> + seq_puts(seq, ",no_read_extent_cache");
>>
>> Ditto,
>>
>> Thanks,
>>
>>> if (test_opt(sbi, DATA_FLUSH))
>>> seq_puts(seq, ",data_flush");
>>> @@ -2076,7 +2076,7 @@ static void default_options(struct f2fs_sb_info *sbi)
>>> set_opt(sbi, INLINE_XATTR);
>>> set_opt(sbi, INLINE_DATA);
>>> set_opt(sbi, INLINE_DENTRY);
>>> - set_opt(sbi, EXTENT_CACHE);
>>> + set_opt(sbi, READ_EXTENT_CACHE);
>>> set_opt(sbi, NOHEAP);
>>> clear_opt(sbi, DISABLE_CHECKPOINT);
>>> set_opt(sbi, MERGE_CHECKPOINT);
>>> @@ -2218,7 +2218,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
>>> bool need_restart_ckpt = false, need_stop_ckpt = false;
>>> bool need_restart_flush = false, need_stop_flush = false;
>>> bool need_restart_discard = false, need_stop_discard = false;
>>> - bool no_extent_cache = !test_opt(sbi, EXTENT_CACHE);
>>> + bool no_read_extent_cache = !test_opt(sbi, READ_EXTENT_CACHE);
>>> bool enable_checkpoint = !test_opt(sbi, DISABLE_CHECKPOINT);
>>> bool no_io_align = !F2FS_IO_ALIGNED(sbi);
>>> bool no_atgc = !test_opt(sbi, ATGC);
>>> @@ -2308,7 +2308,7 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
>>> }
>>> /* disallow enable/disable extent_cache dynamically */
>>> - if (no_extent_cache == !!test_opt(sbi, EXTENT_CACHE)) {
>>> + if (no_read_extent_cache == !!test_opt(sbi, READ_EXTENT_CACHE)) {
>>> err = -EINVAL;
>>> f2fs_warn(sbi, "switch extent_cache option is not allowed");
>>> goto restore_opts;