netfs: Provide a launder_folio implementation (4a79616c) · Commits · git / linux-net

fs/netfs/buffered_write.c

+74 −0

Original line number	Diff line number	Diff line
		@@ -1111,3 +1111,77 @@ int netfs_writepages(struct address_space *mapping,
		return ret;
		}
		EXPORT_SYMBOL(netfs_writepages);

		/*
		* Deal with the disposition of a laundered folio.
		*/
		static void netfs_cleanup_launder_folio(struct netfs_io_request *wreq)
		{
		if (wreq->error) {
		pr_notice("R=%08x Laundering error %d\n", wreq->debug_id, wreq->error);
		mapping_set_error(wreq->mapping, wreq->error);
		}
		}

		/**
		* netfs_launder_folio - Clean up a dirty folio that's being invalidated
		* @folio: The folio to clean
		*
		* This is called to write back a folio that's being invalidated when an inode
		* is getting torn down. Ideally, writepages would be used instead.
		*/
		int netfs_launder_folio(struct folio *folio)
		{
		struct netfs_io_request *wreq;
		struct address_space *mapping = folio->mapping;
		struct netfs_folio *finfo = netfs_folio_info(folio);
		struct netfs_group *group = netfs_folio_group(folio);
		struct bio_vec bvec;
		unsigned long long i_size = i_size_read(mapping->host);
		unsigned long long start = folio_pos(folio);
		size_t offset = 0, len;
		int ret = 0;

		if (finfo) {
		offset = finfo->dirty_offset;
		start += offset;
		len = finfo->dirty_len;
		} else {
		len = folio_size(folio);
		}
		len = min_t(unsigned long long, len, i_size - start);

		wreq = netfs_alloc_request(mapping, NULL, start, len, NETFS_LAUNDER_WRITE);
		if (IS_ERR(wreq)) {
		ret = PTR_ERR(wreq);
		goto out;
		}

		if (!folio_clear_dirty_for_io(folio))
		goto out_put;

		trace_netfs_folio(folio, netfs_folio_trace_launder);

		_debug("launder %llx-%llx", start, start + len - 1);

		/* Speculatively write to the cache. We have to fix this up later if
		* the store fails.
		*/
		wreq->cleanup = netfs_cleanup_launder_folio;

		bvec_set_folio(&bvec, folio, len, offset);
		iov_iter_bvec(&wreq->iter, ITER_SOURCE, &bvec, 1, len);
		__set_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags);
		ret = netfs_begin_write(wreq, true, netfs_write_trace_launder);

		out_put:
		folio_detach_private(folio);
		netfs_put_group(group);
		kfree(finfo);
		netfs_put_request(wreq, false, netfs_rreq_trace_put_return);
		out:
		folio_wait_fscache(folio);
		_leave(" = %d", ret);
		return ret;
		}
		EXPORT_SYMBOL(netfs_launder_folio);

fs/netfs/main.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -30,6 +30,7 @@ static const char *netfs_origins[nr__netfs_io_origin] = {
		[NETFS_READPAGE] = "RP",
		[NETFS_READ_FOR_WRITE] = "RW",
		[NETFS_WRITEBACK] = "WB",
		[NETFS_LAUNDER_WRITE] = "LW",
		[NETFS_UNBUFFERED_WRITE] = "UW",
		[NETFS_DIO_READ] = "DR",
		[NETFS_DIO_WRITE] = "DW",

include/linux/netfs.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -227,6 +227,7 @@ enum netfs_io_origin {
		NETFS_READPAGE, /* This read is a synchronous read */
		NETFS_READ_FOR_WRITE, /* This read is to prepare a write */
		NETFS_WRITEBACK, /* This write was triggered by writepages */
		NETFS_LAUNDER_WRITE, /* This is triggered by ->launder_folio() */
		NETFS_UNBUFFERED_WRITE, /* This is an unbuffered write */
		NETFS_DIO_READ, /* This is a direct I/O read */
		NETFS_DIO_WRITE, /* This is a direct I/O write */
		@@ -404,6 +405,7 @@ int netfs_unpin_writeback(struct inode inode, struct writeback_control wbc);
		void netfs_clear_inode_writeback(struct inode inode, const void aux);
		void netfs_invalidate_folio(struct folio *folio, size_t offset, size_t length);
		bool netfs_release_folio(struct folio *folio, gfp_t gfp);
		int netfs_launder_folio(struct folio *folio);

		/* VMA operations API. */
		vm_fault_t netfs_page_mkwrite(struct vm_fault vmf, struct netfs_group netfs_group);

include/trace/events/netfs.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -25,6 +25,7 @@

		#define netfs_write_traces \
		EM(netfs_write_trace_dio_write, "DIO-WRITE") \
		EM(netfs_write_trace_launder, "LAUNDER ") \
		EM(netfs_write_trace_unbuffered_write, "UNB-WRITE") \
		E_(netfs_write_trace_writeback, "WRITEBACK")

		@@ -33,6 +34,7 @@
		EM(NETFS_READPAGE, "RP") \
		EM(NETFS_READ_FOR_WRITE, "RW") \
		EM(NETFS_WRITEBACK, "WB") \
		EM(NETFS_LAUNDER_WRITE, "LW") \
		EM(NETFS_UNBUFFERED_WRITE, "UW") \
		EM(NETFS_DIO_READ, "DR") \
		E_(NETFS_DIO_WRITE, "DW")
		@@ -127,6 +129,7 @@
		EM(netfs_folio_trace_end_copy, "end-copy") \
		EM(netfs_folio_trace_filled_gaps, "filled-gaps") \
		EM(netfs_folio_trace_kill, "kill") \
		EM(netfs_folio_trace_launder, "launder") \
		EM(netfs_folio_trace_mkwrite, "mkwrite") \
		EM(netfs_folio_trace_mkwrite_plus, "mkwrite+") \
		EM(netfs_folio_trace_read_gaps, "read-gaps") \