Messages in this thread | | | Date | Mon, 23 Nov 2020 09:19:26 -0800 | From | Jaegeuk Kim <> | Subject | Re: [f2fs-dev] [PATCH 2/2] f2fs: add F2FS_IOC_DECOMPRESS_FILE and F2FS_IOC_COMPRESS_FILE |
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On 11/23, Daeho Jeong wrote: > From: Daeho Jeong <daehojeong@google.com> > > Added two ioctl to decompress/compress explicitly the compression > enabled file in "compress_mode=user-based" mount option. > > Using these two ioctls, the users can make a control of compression > and decompression of their files. > > Signed-off-by: Daeho Jeong <daehojeong@google.com> > --- > fs/f2fs/file.c | 181 +++++++++++++++++++++++++++++++++++++- > include/uapi/linux/f2fs.h | 2 + > 2 files changed, 182 insertions(+), 1 deletion(-) > > diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c > index be8db06aca27..e8f142470e87 100644 > --- a/fs/f2fs/file.c > +++ b/fs/f2fs/file.c > @@ -4026,6 +4026,180 @@ static int f2fs_ioc_set_compress_option(struct file *filp, unsigned long arg) > return ret; > } > > +static int redirty_blocks(struct inode *inode, pgoff_t page_idx, int len) > +{ > + DEFINE_READAHEAD(ractl, NULL, inode->i_mapping, page_idx); > + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > + struct address_space *mapping = inode->i_mapping; > + struct page *page; > + pgoff_t redirty_idx = page_idx; > + int i, page_len = 0, ret = 0; > + > + page_cache_ra_unbounded(&ractl, len, 0); > + > + for (i = 0; i < len; i++, page_idx++) { > + page = read_cache_page(mapping, page_idx, NULL, NULL); > + if (IS_ERR(page)) { > + ret = PTR_ERR(page); > + f2fs_warn(sbi, "%s: inode (%lu) : page_index (%lu) " > + "couldn't be read (errno:%d).\n", > + __func__, inode->i_ino, page_idx, ret); > + break; > + } > + page_len++; > + } > + > + for (i = 0; i < page_len; i++, redirty_idx++) { > + page = find_lock_page(mapping, redirty_idx); > + if (!page) { > + ret = -ENOENT; > + f2fs_warn(sbi, "%s: inode (%lu) : page_index (%lu) " > + "couldn't be found (errno:%d).\n", > + __func__, inode->i_ino, redirty_idx, ret); > + } > + set_page_dirty(page); > + f2fs_put_page(page, 1); > + f2fs_put_page(page, 0); > + } > + > + return ret; > +} > + > +static int f2fs_ioc_decompress_file(struct file *filp, unsigned long arg) > +{ > + struct inode *inode = file_inode(filp); > + struct f2fs_sb_info *sbi = F2FS_I_SB(inode); > + struct f2fs_inode_info *fi = F2FS_I(inode); > + pgoff_t page_idx = 0, last_idx; > + int cluster_size = F2FS_I(inode)->i_cluster_size; > + int count, ret; > + > + if (!f2fs_sb_has_compression(sbi)) > + return -EOPNOTSUPP; > + > + if (!(filp->f_mode & FMODE_WRITE)) > + return -EBADF; > + > + if (!f2fs_compressed_file(inode)) > + return -EINVAL; > + > + f2fs_balance_fs(F2FS_I_SB(inode), true); > + > + file_start_write(filp); > + inode_lock(inode); > + > + if (f2fs_is_mmap_file(inode)) { > + ret = -EBUSY; > + goto out; > + } > + > + ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX); > + if (ret) > + goto out; > + > + if (!atomic_read(&fi->i_compr_blocks)) > + goto out; > + > + last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); > + > + count = last_idx - page_idx; > + while (count) { > + int len = min(cluster_size, count); > + > + ret = redirty_blocks(inode, page_idx, len); > + > + if (ret < 0) > + break; > + > + page_idx += len; > + count -= len; > + } > + > + if (!ret) > + ret = filemap_write_and_wait_range(inode->i_mapping, 0, > + LLONG_MAX); > + > + if (!ret) { > + stat_sub_compr_blocks(inode, atomic_read(&fi->i_compr_blocks)); > + atomic_set(&fi->i_compr_blocks, 0); > + f2fs_mark_inode_dirty_sync(inode, true); > + } else { > + f2fs_warn(sbi, "%s: The file might be partially decompressed " > + "(errno=%d). Please delete the file.\n", > + __func__, ret); > + } > +out: > + inode_unlock(inode); > + file_end_write(filp); > + > + return ret; > +} > + > +static int f2fs_ioc_compress_file(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; > + int cluster_size = F2FS_I(inode)->i_cluster_size; > + int count, ret; > + > + if (!f2fs_sb_has_compression(sbi)) > + return -EOPNOTSUPP; > + > + if (!(filp->f_mode & FMODE_WRITE)) > + return -EBADF; > + > + if (!f2fs_compressed_file(inode)) > + return -EINVAL; > + > + f2fs_balance_fs(F2FS_I_SB(inode), true); > + > + file_start_write(filp); > + inode_lock(inode); > + > + if (f2fs_is_mmap_file(inode)) { > + ret = -EBUSY; > + goto out; > + } > + > + ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX); > + if (ret) > + goto out; > + > + set_inode_flag(inode, FI_ENABLE_COMPRESS); > + > + last_idx = DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE); > + > + count = last_idx - page_idx; > + while (count) { > + int len = min(cluster_size, count); > + > + ret = redirty_blocks(inode, page_idx, len); > + > + if (ret < 0) > + break; > + > + page_idx += len; > + count -= len; > + } > + > + if (!ret) > + ret = filemap_write_and_wait_range(inode->i_mapping, 0, > + LLONG_MAX); > + > + clear_inode_flag(inode, FI_ENABLE_COMPRESS); > + > + if (ret) > + f2fs_warn(sbi, "%s: The file might be partially compressed " > + "(errno=%d). Please delete the file.\n", > + __func__, ret); > +out: > + inode_unlock(inode); > + file_end_write(filp); > + > + return ret; > +} > + > static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > { > switch (cmd) { > @@ -4113,6 +4287,10 @@ static long __f2fs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) > return f2fs_ioc_get_compress_option(filp, arg); > case F2FS_IOC_SET_COMPRESS_OPTION: > return f2fs_ioc_set_compress_option(filp, arg); > + case F2FS_IOC_DECOMPRESS_FILE: > + return f2fs_ioc_decompress_file(filp, arg); > + case F2FS_IOC_COMPRESS_FILE: > + return f2fs_ioc_compress_file(filp, arg); > default: > return -ENOTTY; > } > @@ -4352,7 +4530,8 @@ long f2fs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) > case F2FS_IOC_SEC_TRIM_FILE: > case F2FS_IOC_GET_COMPRESS_OPTION: > case F2FS_IOC_SET_COMPRESS_OPTION: > - break; > + case F2FS_IOC_DECOMPRESS_FILE: > + case F2FS_IOC_COMPRESS_FILE:
break; ?
> default: > return -ENOIOCTLCMD; > } > diff --git a/include/uapi/linux/f2fs.h b/include/uapi/linux/f2fs.h > index f00199a2e38b..352a822d4370 100644 > --- a/include/uapi/linux/f2fs.h > +++ b/include/uapi/linux/f2fs.h > @@ -40,6 +40,8 @@ > struct f2fs_comp_option) > #define F2FS_IOC_SET_COMPRESS_OPTION _IOW(F2FS_IOCTL_MAGIC, 22, \ > struct f2fs_comp_option) > +#define F2FS_IOC_DECOMPRESS_FILE _IO(F2FS_IOCTL_MAGIC, 23) > +#define F2FS_IOC_COMPRESS_FILE _IO(F2FS_IOCTL_MAGIC, 24) > > /* > * should be same as XFS_IOC_GOINGDOWN. > -- > 2.29.2.454.gaff20da3a2-goog > > > > _______________________________________________ > Linux-f2fs-devel mailing list > Linux-f2fs-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
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