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Subject[PATCH] f2fs: introduce F2FS_IOC_RESERVE_COMPRESS_BLOCKS
Date
This patch introduces a new ioctl to rollback all compress inode
status:
- add reserved blocks in dnode blocks
- increase i_compr_blocks, i_blocks, total_valid_block_count
- remove immutable flag

Then compress inode can be restored to support overwrite
functionality again.

Signee-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/f2fs.h | 2 +
fs/f2fs/file.c | 161 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 163 insertions(+)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 09270854cce8..bc45f738e3e0 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -429,6 +429,8 @@ static inline bool __has_cursum_space(struct f2fs_journal *journal,
#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_RESERVE_COMPRESS_BLOCKS \
+ _IOR(F2FS_IOCTL_MAGIC, 19, __u64)

#define F2FS_IOC_GET_VOLUME_NAME FS_IOC_GETFSLABEL
#define F2FS_IOC_SET_VOLUME_NAME FS_IOC_SETFSLABEL
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 007b11b5601e..b715901215f0 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -3566,6 +3566,164 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
return ret;
}

+static int reserve_compress_blocks(struct dnode_of_data *dn, pgoff_t count)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
+ unsigned int reserved_blocks = 0;
+ int cluster_size = F2FS_I(dn->inode)->i_cluster_size;
+ block_t blkaddr;
+ int i;
+
+ for (i = 0; i < count; i++) {
+ blkaddr = data_blkaddr(dn->inode, dn->node_page,
+ dn->ofs_in_node + i);
+
+ if (!__is_valid_data_blkaddr(blkaddr))
+ continue;
+ if (unlikely(!f2fs_is_valid_blkaddr(sbi, blkaddr,
+ DATA_GENERIC_ENHANCE)))
+ return -EFSCORRUPTED;
+ }
+
+ while (count) {
+ int compr_blocks = 0;
+ blkcnt_t reserved;
+ int ret;
+
+ for (i = 0; i < cluster_size; i++, dn->ofs_in_node++) {
+ blkaddr = f2fs_data_blkaddr(dn);
+
+ if (i == 0) {
+ if (blkaddr == COMPRESS_ADDR)
+ continue;
+ dn->ofs_in_node += cluster_size;
+ goto next;
+ }
+
+ if (__is_valid_data_blkaddr(blkaddr)) {
+ compr_blocks++;
+ continue;
+ }
+
+ dn->data_blkaddr = NEW_ADDR;
+ f2fs_set_data_blkaddr(dn);
+ }
+
+ reserved = cluster_size - compr_blocks;
+ ret = inc_valid_block_count(sbi, dn->inode, &reserved);
+ if (ret)
+ return ret;
+
+ if (reserved != cluster_size - compr_blocks)
+ return -ENOSPC;
+
+ f2fs_i_compr_blocks_update(dn->inode, compr_blocks, true);
+
+ reserved_blocks += reserved;
+next:
+ count -= cluster_size;
+ }
+
+ return reserved_blocks;
+}
+
+static int f2fs_reserve_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 reserved_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)) {
+ ret = -EINVAL;
+ goto unlock_inode;
+ }
+
+ 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 = reserve_compress_blocks(&dn, count);
+
+ f2fs_put_dnode(&dn);
+
+ if (ret < 0)
+ break;
+
+ page_idx += count;
+ reserved_blocks += ret;
+ }
+
+ up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
+ up_write(&F2FS_I(inode)->i_mmap_sem);
+
+ if (ret >= 0) {
+ 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);
+ }
+unlock_inode:
+ inode_unlock(inode);
+out:
+ mnt_drop_write_file(filp);
+
+ if (ret >= 0) {
+ ret = put_user(reserved_blocks, (u64 __user *)arg);
+ } else if (reserved_blocks && F2FS_I(inode)->i_compr_blocks) {
+ set_sbi_flag(sbi, SBI_NEED_FSCK);
+ f2fs_warn(sbi, "%s: partial blocks were released i_ino=%lx "
+ "iblocks=%llu, reserved=%u, compr_blocks=%llu, "
+ "run fsck to fix.",
+ __func__, inode->i_ino, inode->i_blocks,
+ reserved_blocks,
+ F2FS_I(inode)->i_compr_blocks);
+ }
+
+ 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)))))
@@ -3648,6 +3806,8 @@ long f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
return f2fs_get_compress_blocks(filp, arg);
case F2FS_IOC_RELEASE_COMPRESS_BLOCKS:
return f2fs_release_compress_blocks(filp, arg);
+ case F2FS_IOC_RESERVE_COMPRESS_BLOCKS:
+ return f2fs_reserve_compress_blocks(filp, arg);
default:
return -ENOTTY;
}
@@ -3809,6 +3969,7 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
case F2FS_IOC_SET_VOLUME_NAME:
case F2FS_IOC_GET_COMPRESS_BLOCKS:
case F2FS_IOC_RELEASE_COMPRESS_BLOCKS:
+ case F2FS_IOC_RESERVE_COMPRESS_BLOCKS:
break;
default:
return -ENOIOCTLCMD;
--
2.18.0.rc1
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