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 <yuch...@huawei.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);
+ 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
