From 153a9961b551101cd38e94e26cd92fbfd198b19b Mon Sep 17 00:00:00 2001 From: David Howells Date: Mon, 21 Feb 2022 11:38:17 +0000 Subject: netfs: Implement unbuffered/DIO write support Implement support for unbuffered writes and direct I/O writes. If the write is misaligned with respect to the fscrypt block size, then RMW cycles are performed if necessary. DIO writes are a special case of unbuffered writes with extra restriction imposed, such as block size alignment requirements. Also provide a field that can tell the code to add some extra space onto the bounce buffer for use by the filesystem in the case of a content-encrypted file. Signed-off-by: David Howells Reviewed-by: Jeff Layton cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- include/linux/netfs.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/linux/netfs.h') diff --git a/include/linux/netfs.h b/include/linux/netfs.h index 7c1309568459..e1dfd6775c2c 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -138,6 +138,7 @@ struct netfs_inode { loff_t remote_i_size; /* Size of the remote file */ unsigned long flags; #define NETFS_ICTX_ODIRECT 0 /* The file has DIO in progress */ +#define NETFS_ICTX_UNBUFFERED 1 /* I/O should not use the pagecache */ }; /* @@ -226,7 +227,9 @@ 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_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 */ nr__netfs_io_origin } __mode(byte); @@ -379,6 +382,7 @@ ssize_t netfs_unbuffered_read_iter(struct kiocb *iocb, struct iov_iter *iter); /* High-level write API */ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter, struct netfs_group *netfs_group); +ssize_t netfs_unbuffered_write_iter(struct kiocb *iocb, struct iov_iter *from); /* Address operations API */ struct readahead_control; -- cgit v1.2.3-73-gaa49b