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Subject[PATCH v2] f2fs: introduce F2FS_IOC_RELEASE_COMPRESS_BLOCKS
Date
There are still reserved blocks on compressed inode, this patch
introduce a new ioctl to help release reserved blocks back to
filesystem, so that userspace can reuse those freed space.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
v2:
- set inode as immutable in ioctl.
fs/f2fs/f2fs.h | 6 +++
fs/f2fs/file.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 141 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 23b93a116c73..4a02edc2454b 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -427,6 +427,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
#define F2FS_IOC_PRECACHE_EXTENTS _IO(F2FS_IOCTL_MAGIC, 15)
#define F2FS_IOC_RESIZE_FS _IOW(F2FS_IOCTL_MAGIC, 16, __u64)
#define F2FS_IOC_GET_COMPRESS_BLOCKS _IOR(F2FS_IOCTL_MAGIC, 17, __u64)
+#define F2FS_IOC_RELEASE_COMPRESS_BLOCKS \
+ _IOR(F2FS_IOCTL_MAGIC, 18, __u64)

#define F2FS_IOC_GET_VOLUME_NAME FS_IOC_GETFSLABEL
#define F2FS_IOC_SET_VOLUME_NAME FS_IOC_SETFSLABEL
@@ -3956,6 +3958,10 @@ static inline void f2fs_i_compr_blocks_update(struct inode *inode,
{
int diff = F2FS_I(inode)->i_cluster_size - blocks;

+ /* don't update i_compr_blocks if saved blocks were released */
+ if (!add && !F2FS_I(inode)->i_compr_blocks)
+ return;
+
if (add) {
F2FS_I(inode)->i_compr_blocks += diff;
stat_add_compr_blocks(inode, diff);
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 37c1147eb244..b8f01ee9d698 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -550,6 +550,7 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
bool compressed_cluster = false;
int cluster_index = 0, valid_blocks = 0;
int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
+ bool released = !F2FS_I(dn->inode)->i_compr_blocks;

if (IS_INODE(dn->node_page) && f2fs_has_extra_attr(dn->inode))
base = get_extra_isize(dn->inode);
@@ -588,7 +589,9 @@ void f2fs_truncate_data_blocks_range(struct dnode_of_data *dn, int count)
clear_inode_flag(dn->inode, FI_FIRST_BLOCK_WRITTEN);

f2fs_invalidate_blocks(sbi, blkaddr);
- nr_free++;
+
+ if (released && blkaddr != COMPRESS_ADDR)
+ nr_free++;
}

if (compressed_cluster)
@@ -3403,6 +3406,134 @@ static int f2fs_get_compress_blocks(struct file *filp, unsigned long arg)
return put_user(blocks, (u64 __user *)arg);
}

+static int release_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
+ unsigned int released_blocks = 0;
+ int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
+
+ while (count) {
+ int compr_blocks = 0;
+ block_t blkaddr = f2fs_data_blkaddr(dn);
+ int i;
+
+ if (blkaddr != COMPRESS_ADDR) {
+ dn->ofs_in_node += cluster_size;
+ goto next;
+ }
+
+ for (i = 0; i < cluster_size; i++, dn->ofs_in_node++) {
+ blkaddr = f2fs_data_blkaddr(dn);
+
+ if (__is_valid_data_blkaddr(blkaddr)) {
+ compr_blocks++;
+ if (unlikely(!f2fs_is_valid_blkaddr(sbi, blkaddr,
+ DATA_GENERIC_ENHANCE)))
+ return -EFSCORRUPTED;
+ }
+
+ if (blkaddr != NEW_ADDR)
+ continue;
+
+ dn->data_blkaddr = NULL_ADDR;
+ f2fs_set_data_blkaddr(dn);
+ }
+
+ f2fs_i_compr_blocks_update(dn->inode, compr_blocks, false);
+ dec_valid_block_count(sbi, dn->inode,
+ cluster_size - compr_blocks);
+
+ released_blocks += cluster_size - compr_blocks;
+next:
+ count -= cluster_size;
+ }
+
+ return released_blocks;
+}
+
+static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
+{
+ struct inode *inode = file_inode(filp);
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ pgoff_t page_idx = 0, last_idx;
+ unsigned int released_blocks = 0;
+ int ret;
+
+ if (!f2fs_sb_has_compression(F2FS_I_SB(inode)))
+ return -EOPNOTSUPP;
+
+ if (!f2fs_compressed_file(inode))
+ return -EINVAL;
+
+ if (f2fs_readonly(sbi->sb))
+ return -EROFS;
+
+ ret = mnt_want_write_file(filp);
+ if (ret)
+ return ret;
+
+ if (!F2FS_I(inode)->i_compr_blocks)
+ goto out;
+
+ f2fs_balance_fs(F2FS_I_SB(inode), true);
+
+ inode_lock(inode);
+
+ if (!IS_IMMUTABLE(inode)) {
+ F2FS_I(inode)->i_flags |= F2FS_IMMUTABLE_FL;
+ f2fs_set_inode_flags(inode);
+ inode->i_ctime = current_time(inode);
+ f2fs_mark_inode_dirty_sync(inode, true);
+ }
+
+ down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+ down_write(&F2FS_I(inode)->i_mmap_sem);
+
+ last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE);
+
+ while (page_idx < last_idx) {
+ struct dnode_of_data dn;
+ pgoff_t end_offset, count;
+
+ set_new_dnode(&dn, inode, NULL, NULL, 0);
+ ret = f2fs_get_dnode_of_data(&dn, page_idx, LOOKUP_NODE);
+ if (ret) {
+ if (ret == -ENOENT) {
+ page_idx = f2fs_get_next_page_offset(&dn,
+ page_idx);
+ ret = 0;
+ continue;
+ }
+ break;
+ }
+
+ end_offset = ADDRS_PER_PAGE(dn.node_page, inode);
+ count = min(end_offset - dn.ofs_in_node, last_idx - page_idx);
+
+ ret = release_compress_blocks(&dn, count);
+
+ f2fs_put_dnode(&dn);
+
+ if (ret < 0)
+ break;
+
+ page_idx += count;
+ released_blocks += ret;
+ }
+
+ up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+ up_write(&F2FS_I(inode)->i_mmap_sem);
+
+ inode_unlock(inode);
+out:
+ mnt_drop_write_file(filp);
+
+ if (!ret)
+ ret = put_user(released_blocks, (u64 __user *)arg);
+
+ return ret;
+}
+
long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
if (unlikely(f2fs_cp_error(F2FS_I_SB(file_inode(filp)))))
@@ -3483,6 +3614,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return f2fs_set_volume_name(filp, arg);
case F2FS_IOC_GET_COMPRESS_BLOCKS:
return f2fs_get_compress_blocks(filp, arg);
+ case F2FS_IOC_RELEASE_COMPRESS_BLOCKS:
+ return f2fs_release_compress_blocks(filp, arg);
default:
return -ENOTTY;
}
@@ -3643,6 +3776,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case F2FS_IOC_GET_VOLUME_NAME:
case F2FS_IOC_SET_VOLUME_NAME:
case F2FS_IOC_GET_COMPRESS_BLOCKS:
+ case F2FS_IOC_RELEASE_COMPRESS_BLOCKS:
break;
default:
return -ENOIOCTLCMD;
--
2.18.0.rc1
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