kernel/git/next/linux-next.git/fs/netfs, branch master

netfs: Set subrequest->source at alloc before trace emission

2026-09-10T09:54:41+00:00

Set subrequest->source in netfs_alloc_subrequest() before we emit the trace line indicating we allocated the subrequest. Note that this requires the allocation of the subreq in netfs_read_to_pagecache() to be pushed to after the decision about what sort of subreq it should be. Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-9-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org Signed-off-by: Christian Brauner (Amutable)

netfs: Add some functions to wrap the all-queued handling

2026-09-10T09:54:41+00:00

Add some helper functions to wrap the handling of the NETFS_RREQ_ALL_QUEUED flag and to insert the appropriate barriers. Also add an smb_mb__after_atomic() after the set_bit() to make sure stuff after the set_bit() in the same thread doesn't get ordered before. Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-8-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: Make deprecated PG_private_2 support opt-in

2026-09-10T09:54:41+00:00

Make the deprecated PG_private_2 support opt-in, requiring it to be selected by the filesystems that might want to use it. Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-7-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: Trond Myklebust cc: Anna Schumaker cc: Ilya Dryomov cc: Alex Markuze cc: Viacheslav Dubeyko cc: netfs@lists.linux.dev cc: linux-nfs@vger.kernel.org cc: ceph-devel@vger.kernel.org cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: Add the cache object ID to netfs_read/write tracepoints

2026-09-10T09:54:40+00:00

Add the cache object debug ID to netfs_read/write tracepoints to make debugging easier as there's now a direct cross-reference with the cachefiles tracepoints that only log that debug ID. Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-6-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: trace: Rejig a couple of the tracepoints

2026-09-10T09:54:40+00:00

Rejig the following tracepoints: (1) Change netfs_folio to show the pfn. (2) Change netfs_collect_folio to show a folio index range rather than file position range and don't show the cleaned_to or collected_to points. Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-5-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: trace: Change the "clear" folio traces to "endwb"

2026-09-10T09:54:40+00:00

Change the "clear" folio traces to "endwb" as it's more obvious what it means. Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-4-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: Remove the writethrough code

2026-09-10T09:54:39+00:00

Remove the netfs writethrough code as it's very tricky to get the locking right and it will probably deadlock if used in conjunction with Ceph snapshots because it excludes writeback for the duration, but to flush out old snapshots, it does a synchronous flush that invokes writeback. Instead, O_SYNC writes do a flush after performing the write - which is already there as the callers of netfs_perform_write() all call generic_write_sync(). Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-3-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: Use uoff_t instead of unsigned long long and loff_t

2026-09-10T09:54:39+00:00

Use uoff_t instead of unsigned long long and loff_t for file positions that can't be negative. Signed-off-by: David Howells Link: https://patch.msgid.link/20260909072105.1663687-2-dhowells@redhat.com Reviewed-by: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: Fix read progress reporting

2026-08-31T07:54:38+00:00

For really big read RPC ops that span multiple folios, netfslib allows the filesystem to give progress notifications to wake up the collector thread to do a collection of folios that have now been fetched, even if the RPC is still ongoing, thereby allowing the application to make progress. This works by taking the current rreq->cleaned_to value (which indicates which folios have been unlocked) and adding the stashed size of the next folio to it. cleaned_to, however, is subject to 64-bit tearing on a 32-bit arch. Fix this by stashing the next progress notification point as a size_t (which won't tear) to be added to rreq->start (which won't change), with the collector thread calculating that from cleaned_to plus the next folio size. Further, however, if the folios are small, the collector thread gets constantly woken up - which has a negative performance impact on the system. Fix that too by setting a minimum trigger of 256KiB or the size of the folio at the front of the queue, whichever is larger. Note that this has an issue that different subreqs have different need-to-be-cached properties; this is solved by a preceding patch that marks the property on the folios whilst issuing subreqs rather than when collecting them. Also, make sure rreq->cleaned_to is initialised up front, along with rreq->collected_to and stream->collected_to. Fixes: e2d46f2ec332 ("netfs: Change the read result collector to only use one work item") Link: https://sashiko.dev/#/patchset/20260804100224.2748935-1-dhowells%40redhat.com Signed-off-by: David Howells Link: https://patch.msgid.link/20260827134304.2075713-10-dhowells@redhat.com Acked-by: Paulo Alcantara cc: Paulo Alcantara cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)

netfs: Mark folios with COPY_TO_CACHE whilst issuing subreqs

2026-08-31T07:54:38+00:00

Mark folios with NETFS_FOLIO_COPY_TO_CACHE whilst issuing subreqs rather than when collecting them. This means that the collector thread doesn't have to try and keep track of which subreqs contribute to which folios - and thus which folios will need to be copied to the cache because at least one byte wasn't in the cache. Instead, this is marked on the folios up front and the collector need only consider the folios. For PG_private_2-using filesystems, PG_private_2 is set instead of NETFS_FOLIO_COPY_TO_CACHE, but otherwise it works the same. The NETFS_RREQ_COPY_TO_CACHE is replaced with NETFS_RREQ_CANCEL_CACHING, which is now set if caching fails somewhere, thereby causing the collection thread to cancel the copy-to-cache marks on the remaining folios. Signed-off-by: David Howells Link: https://patch.msgid.link/20260827134304.2075713-9-dhowells@redhat.com Acked-by: Paulo Alcantara cc: Paulo Alcantara (Red Hat) cc: Matthew Wilcox cc: netfs@lists.linux.dev cc: linux-mm@kvack.org cc: linux-fsdevel@vger.kernel.org Signed-off-by: Christian Brauner (Amutable)