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Merge tag 'vfs-6.12.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull netfs updates from Christian Brauner:
"This contains the work to improve read/write performance for the new
netfs library.
The main performance enhancing changes are:
- Define a structure, struct folio_queue, and a new iterator type,
ITER_FOLIOQ, to hold a buffer as a replacement for ITER_XARRAY. See
that patch for questions about naming and form.
ITER_FOLIOQ is provided as a replacement for ITER_XARRAY. The
problem with an xarray is that accessing it requires the use of a
lock (typically the RCU read lock) - and this means that we can't
supply iterate_and_advance() with a step function that might sleep
(crypto for example) without having to drop the lock between pages.
ITER_FOLIOQ is the iterator for a chain of folio_queue structs,
where each folio_queue holds a small list of folios. A folio_queue
struct is a simpler structure than xarray and is not subject to
concurrent manipulation by the VM. folio_queue is used rather than
a bvec[] as it can form lists of indefinite size, adding to one end
and removing from the other on the fly.
- Provide a copy_folio_from_iter() wrapper.
- Make cifs RDMA support ITER_FOLIOQ.
- Use folio queues in the write-side helpers instead of xarrays.
- Add a function to reset the iterator in a subrequest.
- Simplify the write-side helpers to use sheaves to skip gaps rather
than trying to work out where gaps are.
- In afs, make the read subrequests asynchronous, putting them into
work items to allow the next patch to do progressive
unlocking/reading.
- Overhaul the read-side helpers to improve performance.
- Fix the caching of a partial block at the end of a file.
- Allow a store to be cancelled.
Then some changes for cifs to make it use folio queues instead of
xarrays for crypto bufferage:
- Use raw iteration functions rather than manually coding iteration
when hashing data.
- Switch to using folio_queue for crypto buffers.
- Remove the xarray bits.
Make some adjustments to the /proc/fs/netfs/stats file such that:
- All the netfs stats lines begin 'Netfs:' but change this to
something a bit more useful.
- Add a couple of stats counters to track the numbers of skips and
waits on the per-inode writeback serialisation lock to make it
easier to check for this as a source of performance loss.
Miscellaneous work:
- Ensure that the sb_writers lock is taken around
vfs_{set,remove}xattr() in the cachefiles code.
- Reduce the number of conditional branches in netfs_perform_write().
- Move the CIFS_INO_MODIFIED_ATTR flag to the netfs_inode struct and
remove cifs_post_modify().
- Move the max_len/max_nr_segs members from netfs_io_subrequest to
netfs_io_request as they're only needed for one subreq at a time.
- Add an 'unknown' source value for tracing purposes.
- Remove NETFS_COPY_TO_CACHE as it's no longer used.
- Set the request work function up front at allocation time.
- Use bh-disabling spinlocks for rreq->lock as cachefiles completion
may be run from block-filesystem DIO completion in softirq context.
- Remove fs/netfs/io.c"
* tag 'vfs-6.12.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (25 commits)
docs: filesystems: corrected grammar of netfs page
cifs: Don't support ITER_XARRAY
cifs: Switch crypto buffer to use a folio_queue rather than an xarray
cifs: Use iterate_and_advance*() routines directly for hashing
netfs: Cancel dirty folios that have no storage destination
cachefiles, netfs: Fix write to partial block at EOF
netfs: Remove fs/netfs/io.c
netfs: Speed up buffered reading
afs: Make read subreqs async
netfs: Simplify the writeback code
netfs: Provide an iterator-reset function
netfs: Use new folio_queue data type and iterator instead of xarray iter
cifs: Provide the capability to extract from ITER_FOLIOQ to RDMA SGEs
iov_iter: Provide copy_folio_from_iter()
mm: Define struct folio_queue and ITER_FOLIOQ to handle a sequence of folios
netfs: Use bh-disabling spinlocks for rreq->lock
netfs: Set the request work function upon allocation
netfs: Remove NETFS_COPY_TO_CACHE
netfs: Reserve netfs_sreq_source 0 as unset/unknown
netfs: Move max_len/max_nr_segs from netfs_io_subrequest to netfs_io_stream
...
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|---|---|---|
| .. | ||
| bcachefs | ||
| caching | ||
| ext4 | ||
| iomap | ||
| nfs | ||
| smb | ||
| spufs | ||
| xfs | ||
| 9p.rst | ||
| adfs.rst | ||
| affs.rst | ||
| afs.rst | ||
| api-summary.rst | ||
| autofs-mount-control.rst | ||
| autofs.rst | ||
| automount-support.rst | ||
| befs.rst | ||
| bfs.rst | ||
| btrfs.rst | ||
| buffer.rst | ||
| ceph.rst | ||
| coda.rst | ||
| configfs.rst | ||
| cramfs.rst | ||
| dax.rst | ||
| debugfs.rst | ||
| devpts.rst | ||
| directory-locking.rst | ||
| dlmfs.rst | ||
| dnotify.rst | ||
| ecryptfs.rst | ||
| efivarfs.rst | ||
| erofs.rst | ||
| ext2.rst | ||
| ext3.rst | ||
| f2fs.rst | ||
| fiemap.rst | ||
| files.rst | ||
| fscrypt.rst | ||
| fsverity.rst | ||
| fuse-io.rst | ||
| fuse.rst | ||
| gfs2-glocks.rst | ||
| gfs2-uevents.rst | ||
| gfs2.rst | ||
| hfs.rst | ||
| hfsplus.rst | ||
| hpfs.rst | ||
| idmappings.rst | ||
| index.rst | ||
| inotify.rst | ||
| isofs.rst | ||
| journalling.rst | ||
| locking.rst | ||
| locks.rst | ||
| mount_api.rst | ||
| netfs_library.rst | ||
| nilfs2.rst | ||
| ntfs3.rst | ||
| ocfs2-online-filecheck.rst | ||
| ocfs2.rst | ||
| omfs.rst | ||
| orangefs.rst | ||
| overlayfs.rst | ||
| path-lookup.rst | ||
| path-lookup.txt | ||
| porting.rst | ||
| proc.rst | ||
| qnx6.rst | ||
| quota.rst | ||
| ramfs-rootfs-initramfs.rst | ||
| relay.rst | ||
| romfs.rst | ||
| seq_file.rst | ||
| sharedsubtree.rst | ||
| splice.rst | ||
| squashfs.rst | ||
| sysfs.rst | ||
| sysv-fs.rst | ||
| tmpfs.rst | ||
| ubifs-authentication.rst | ||
| ubifs.rst | ||
| udf.rst | ||
| vfat.rst | ||
| vfs.rst | ||
| virtiofs.rst | ||
| zonefs.rst | ||