fs/netfs: remove unused flag NETFS_SREQ_SEEK_DATA_READ

This flag was added by commit 3d3c950467 ("netfs: Provide readahead
and readpage netfs helpers") but its only user was removed by commit
86b374d061 ("netfs: Remove fs/netfs/io.c").

Signed-off-by: Max Kellermann <max.kellermann@ionos.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/20250519134813.2975312-3-dhowells@redhat.com
cc: Paulo Alcantara <pc@manguebit.com>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

Documentation/filesystems/netfs_library.rst

@@ -712,11 +712,6 @@ handle falling back from one source type to another.  The members are:
      at a boundary with the filesystem structure (e.g. at the end of a Ceph
      object).  It tells netfslib not to retile subrequests across it.
 
-   * ``NETFS_SREQ_SEEK_DATA_READ``
-
-     This is a hint from netfslib to the cache that it might want to try
-     skipping ahead to the next data (ie. using SEEK_DATA).
-
  * ``error``
 
    This is for the filesystem to store result of the subrequest.  It should be

include/linux/netfs.h

@@ -191,7 +191,6 @@ struct netfs_io_subrequest {
 	unsigned long		flags;
 #define NETFS_SREQ_COPY_TO_CACHE	0	/* Set if should copy the data to the cache */
 #define NETFS_SREQ_CLEAR_TAIL		1	/* Set if the rest of the read should be cleared */
-#define NETFS_SREQ_SEEK_DATA_READ	3	/* Set if ->read() should SEEK_DATA first */
 #define NETFS_SREQ_MADE_PROGRESS	4	/* Set if we transferred at least some data */
 #define NETFS_SREQ_ONDEMAND		5	/* Set if it's from on-demand read mode */
 #define NETFS_SREQ_BOUNDARY		6	/* Set if ends on hard boundary (eg. ceph object) */