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Message-ID: <20180110192449.GB18352@jaegeuk-macbookpro.roam.corp.google.com>
Date: Wed, 10 Jan 2018 11:24:49 -0800
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: Chao Yu <yuchao0@...wei.com>
Cc: linux-f2fs-devel@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, chao@...nel.org
Subject: Re: [PATCH v2 1/4] f2fs: support F2FS_IOC_PRECACHE_EXTENTS
On 01/10, Chao Yu wrote:
> This patch introduces a new ioctl F2FS_IOC_PRECACHE_EXTENTS to precache
> extent info like ext4, in order to gain better performance during
> triggering AIO by eliminating synchronous waiting of mapping info.
>
> Referred commit: 7869a4a6c5ca ("ext4: add support for extent pre-caching")
>
> In addition, with newly added extent precache abilitiy, this patch add
> to support FIEMAP_FLAG_CACHE in ->fiemap.
>
> Signed-off-by: Chao Yu <yuchao0@...wei.com>
> ---
> v2:
> - integrate extent precache related patches into this one.
> fs/f2fs/data.c | 33 +++++++++++++++++++++++++++++++++
> fs/f2fs/f2fs.h | 3 +++
> fs/f2fs/file.c | 39 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 75 insertions(+)
>
> diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> index 8c05e9a74427..d7d3b2b49907 100644
> --- a/fs/f2fs/data.c
> +++ b/fs/f2fs/data.c
> @@ -927,6 +927,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> blkcnt_t prealloc;
> struct extent_info ei = {0,0,0};
> block_t blkaddr;
> + unsigned int start_pgofs;
>
> if (!maxblocks)
> return 0;
> @@ -942,6 +943,8 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> map->m_pblk = ei.blk + pgofs - ei.fofs;
> map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
> map->m_flags = F2FS_MAP_MAPPED;
> + if (map->m_next_pgofs)
> + *map->m_next_pgofs = pgofs + map->m_len;
> goto out;
> }
>
> @@ -964,6 +967,7 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> goto unlock_out;
> }
>
> + start_pgofs = pgofs;
> prealloc = 0;
> last_ofs_in_node = ofs_in_node = dn.ofs_in_node;
> end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
> @@ -997,6 +1001,8 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> map->m_pblk = 0;
> goto sync_out;
> }
> + if (flag == F2FS_GET_BLOCK_PRECACHE)
> + goto sync_out;
> if (flag == F2FS_GET_BLOCK_FIEMAP &&
> blkaddr == NULL_ADDR) {
> if (map->m_next_pgofs)
> @@ -1055,6 +1061,16 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> else if (dn.ofs_in_node < end_offset)
> goto next_block;
>
> + if (flag == F2FS_GET_BLOCK_PRECACHE) {
> + if (map->m_flags & F2FS_MAP_MAPPED) {
> + unsigned int ofs = start_pgofs - map->m_lblk;
> +
> + f2fs_update_extent_cache_range(&dn,
> + start_pgofs, map->m_pblk + ofs,
> + map->m_len - ofs);
> + }
> + }
> +
> f2fs_put_dnode(&dn);
>
> if (create) {
> @@ -1064,6 +1080,17 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
> goto next_dnode;
>
> sync_out:
> + if (flag == F2FS_GET_BLOCK_PRECACHE) {
> + if (map->m_flags & F2FS_MAP_MAPPED) {
> + unsigned int ofs = start_pgofs - map->m_lblk;
> +
> + f2fs_update_extent_cache_range(&dn,
> + start_pgofs, map->m_pblk + ofs,
> + map->m_len - ofs);
> + }
> + if (map->m_next_pgofs)
> + *map->m_next_pgofs = pgofs + 1;
> + }
> f2fs_put_dnode(&dn);
> unlock_out:
> if (create) {
> @@ -1210,6 +1237,12 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
>
> inode_lock(inode);
>
> + if (fieinfo->fi_flags & FIEMAP_FLAG_CACHE) {
> + ret = f2fs_precache_extents(inode);
We need to do inode_lock() in f2fs_precache_extents() after uncovering here?
> + if (ret)
> + goto out;
> + }
> +
> ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC | FIEMAP_FLAG_XATTR);
> if (ret)
> goto out;
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 3b3ddcdc98e9..73a751cdbac1 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -359,6 +359,7 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
> struct f2fs_gc_range)
> #define F2FS_IOC_GET_FEATURES _IOR(F2FS_IOCTL_MAGIC, 12, __u32)
> #define F2FS_IOC_SET_PIN_FILE _IOW(F2FS_IOCTL_MAGIC, 13, __u32)
> +#define F2FS_IOC_PRECACHE_EXTENTS _IO(F2FS_IOCTL_MAGIC, 14)
>
> #define F2FS_IOC_SET_ENCRYPTION_POLICY FS_IOC_SET_ENCRYPTION_POLICY
> #define F2FS_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY
> @@ -564,6 +565,7 @@ enum {
> F2FS_GET_BLOCK_BMAP,
> F2FS_GET_BLOCK_PRE_DIO,
> F2FS_GET_BLOCK_PRE_AIO,
> + F2FS_GET_BLOCK_PRECACHE,
> };
>
> /*
> @@ -2567,6 +2569,7 @@ int f2fs_getattr(const struct path *path, struct kstat *stat,
> int f2fs_setattr(struct dentry *dentry, struct iattr *attr);
> int truncate_hole(struct inode *inode, pgoff_t pg_start, pgoff_t pg_end);
> void truncate_data_blocks_range(struct dnode_of_data *dn, int count);
> +int f2fs_precache_extents(struct inode *inode);
> long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg);
> long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
> int f2fs_pin_file_control(struct inode *inode, bool inc);
> diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
> index e4078b32856c..6e30016f26ad 100644
> --- a/fs/f2fs/file.c
> +++ b/fs/f2fs/file.c
> @@ -2734,6 +2734,42 @@ static int f2fs_ioc_set_pin_file(struct file *filp, unsigned long arg)
> return ret;
> }
>
> +int f2fs_precache_extents(struct inode *inode)
> +{
> + struct f2fs_inode_info *fi = F2FS_I(inode);
> + struct f2fs_map_blocks map;
> + pgoff_t next_pgofs;
> + loff_t end;
> + int err;
> +
> + if (is_inode_flag_set(inode, FI_NO_EXTENT))
> + return -EOPNOTSUPP;
> +
> + map.m_lblk = 0;
> + map.m_next_pgofs = &next_pgofs;
> + map.m_seg_type = NO_CHECK_TYPE;
> + end = F2FS_I_SB(inode)->max_file_blocks;
> +
> + while (map.m_lblk < end) {
> + map.m_len = end - map.m_lblk;
> +
> + down_write(&fi->dio_rwsem[WRITE]);
> + err = f2fs_map_blocks(inode, &map, 0, F2FS_GET_BLOCK_PRECACHE);
> + up_write(&fi->dio_rwsem[WRITE]);
> + if (err)
> + return err;
> +
> + map.m_lblk = next_pgofs;
> + }
> +
> + return err;
> +}
> +
> +static int f2fs_ioc_precache_extents(struct file *filp, unsigned long arg)
> +{
> + return f2fs_precache_extents(file_inode(filp));
> +}
> +
> long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> {
> if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
> @@ -2786,6 +2822,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> return f2fs_ioc_fssetxattr(filp, arg);
> case F2FS_IOC_SET_PIN_FILE:
> return f2fs_ioc_set_pin_file(filp, arg);
> + case F2FS_IOC_PRECACHE_EXTENTS:
> + return f2fs_ioc_precache_extents(filp, arg);
> default:
> return -ENOTTY;
> }
> @@ -2862,6 +2900,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
> case F2FS_IOC_FSGETXATTR:
> case F2FS_IOC_FSSETXATTR:
> case F2FS_IOC_SET_PIN_FILE:
> + case F2FS_IOC_PRECACHE_EXTENTS:
> break;
> default:
> return -ENOIOCTLCMD;
> --
> 2.15.0.55.gc2ece9dc4de6
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