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Commit b390210e authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: support partial truncation on compressed inode 



Supports to truncate compressed/normal cluster partially on compressed
inode.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 73bfe5df

fs/f2fs/compress.c

+49 −0
Original line number Diff line number Diff line
@@ -959,6 +959,55 @@ bool f2fs_compress_write_end(struct inode *inode, void *fsdata, 
	return first_index;

}



int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock)

{

	void *fsdata = NULL;

	struct page *pagep;

	int log_cluster_size = F2FS_I(inode)->i_log_cluster_size;

	pgoff_t start_idx = from >> (PAGE_SHIFT + log_cluster_size) <<

							log_cluster_size;

	int err;



	err = f2fs_is_compressed_cluster(inode, start_idx);

	if (err < 0)

		return err;



	/* truncate normal cluster */

	if (!err)

		return f2fs_do_truncate_blocks(inode, from, lock);



	/* truncate compressed cluster */

	err = f2fs_prepare_compress_overwrite(inode, &pagep,

						start_idx, &fsdata);



	/* should not be a normal cluster */

	f2fs_bug_on(F2FS_I_SB(inode), err == 0);



	if (err <= 0)

		return err;



	if (err > 0) {

		struct page **rpages = fsdata;

		int cluster_size = F2FS_I(inode)->i_cluster_size;

		int i;



		for (i = cluster_size - 1; i >= 0; i--) {

			loff_t start = rpages[i]->index << PAGE_SHIFT;



			if (from <= start) {

				zero_user_segment(rpages[i], 0, PAGE_SIZE);

			} else {

				zero_user_segment(rpages[i], from - start,

								PAGE_SIZE);

				break;

			}

		}



		f2fs_compress_write_end(inode, fsdata, start_idx, true);

	}

	return 0;

}



static int f2fs_write_compressed_pages(struct compress_ctx *cc,

					int *submitted,

					struct writeback_control *wbc,

fs/f2fs/f2fs.h

+2 −0
Original line number Diff line number Diff line
@@ -3140,6 +3140,7 @@ static inline void f2fs_clear_page_private(struct page *page) 
 */

int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync);

void f2fs_truncate_data_blocks(struct dnode_of_data *dn);

int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock);

int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock);

int f2fs_truncate(struct inode *inode);

int f2fs_getattr(const struct path *path, struct kstat *stat,
@@ -3857,6 +3858,7 @@ int f2fs_prepare_compress_overwrite(struct inode *inode, 
			struct page **pagep, pgoff_t index, void **fsdata);

bool f2fs_compress_write_end(struct inode *inode, void *fsdata,

					pgoff_t index, unsigned copied);

int f2fs_truncate_partial_cluster(struct inode *inode, u64 from, bool lock);

void f2fs_compress_write_end_io(struct bio *bio, struct page *page);

bool f2fs_is_compress_backend_ready(struct inode *inode);

void f2fs_decompress_pages(struct bio *bio, struct page *page, bool verity);

fs/f2fs/file.c

+14 −5
Original line number Diff line number Diff line
@@ -646,9 +646,6 @@ static int truncate_partial_data_page(struct inode *inode, u64 from, 
		return 0;

	}



	if (f2fs_compressed_file(inode))

		return 0;



	page = f2fs_get_lock_data_page(inode, index, true);

	if (IS_ERR(page))

		return PTR_ERR(page) == -ENOENT ? 0 : PTR_ERR(page);
@@ -664,7 +661,7 @@ static int truncate_partial_data_page(struct inode *inode, u64 from, 
	return 0;

}



static int do_truncate_blocks(struct inode *inode, u64 from, bool lock)

int f2fs_do_truncate_blocks(struct inode *inode, u64 from, bool lock)

{

	struct f2fs_sb_info *sbi = F2FS_I_SB(inode);

	struct dnode_of_data dn;
@@ -732,7 +729,9 @@ static int do_truncate_blocks(struct inode *inode, u64 from, bool lock) 
int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock)

{

	u64 free_from = from;

	int err;



#ifdef CONFIG_F2FS_FS_COMPRESSION

	/*

	 * for compressed file, only support cluster size

	 * aligned truncation.
@@ -747,8 +746,18 @@ int f2fs_truncate_blocks(struct inode *inode, u64 from, bool lock) 
			free_from++;

		free_from <<= cluster_shift;

	}

#endif



	err = f2fs_do_truncate_blocks(inode, free_from, lock);

	if (err)

		return err;



#ifdef CONFIG_F2FS_FS_COMPRESSION

	if (from != free_from)

		err = f2fs_truncate_partial_cluster(inode, from, lock);

#endif



	return do_truncate_blocks(inode, free_from, lock);

	return err;

}



int f2fs_truncate(struct inode *inode)