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2a49d49159
Please consider pulling these changes from the signed vfs-7.4-rc1.netfs tag.
Thanks!
Christian
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Merge tag 'vfs-7.4-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
Pull netfs updates from Christian Brauner:
"This contains the netfs and cachefiles changes for this cycle from
David.
Cachefiles learns to cache the most common class of files properly,
files that are created or truncated, written once sequentially and
closed. So far it relied on the backing filesystem's idea of what is
stored and asked with SEEK_DATA and SEEK_HOLE before every read it
prepared, two seeks per read, and the backing filesystem is free to
insert or remove runs of zeros which produces false positives and
false negatives. The object type in the state xattr is now actually
set to CACHEFILES_CONTENT_{SINGLE,ALL,BACKFS_MAP} instead of zero. For
files written contiguously the type is ALL, the backing file's i_size
tracks how much is cached and the object size lives in the xattr, and
reads skip the seeks entirely. Netfslib queries the cache occupancy
through a new ->query_occupancy() method that returns up to two
extents at once, ->prepare_read() only limits the size of a cache read
anymore and a new ->collect_write() lets the cache update its metadata
once a contiguous run of writes completes. The state xattr is preset
when the tmpfile is created so ENOSPC from setxattr can't scrap a
fully written cache file. Two fixes for this followed, one for resize
handling where the cache's idea of the size can be stale and one for
an unset error that hung a request on a failed cache write.
Preparatory work converts file positions that can't be negative to
uoff_t, removes the writethrough code whose locking looked like it
could deadlock with ceph snapshots, makes the deprecated PG_private_2
support opt-in so mm can get its page bit back, adds helpers for the
NETFS_RREQ_ALL_QUEUED barriers and adds the cache object id to the
read and write tracepoints. Plus an unused header removal and two
documentation fixes"
* tag 'vfs-7.4-rc1.netfs' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs:
fscache, cachefiles: Fix resize handling
cachefiles: Fix unset error when calling netfs_prepare_write_failed()
netfs: remove unused fscache_internal.h header
cachefiles: Preset the state xattr when creating a new file
cachefiles: Don't rely on backing fs storage map for most use cases
netfs: Document the remote size member and its accessors
cachefiles: Add a tracepoint to log insufficient space errors
netfs, cachefiles: Add a couple of traces for write failure
cachefiles: Clean up cachefiles_do_prepare_read()
netfs: Set subrequest->source at alloc before trace emission
netfs: Add some functions to wrap the all-queued handling
netfs: Make deprecated PG_private_2 support opt-in
netfs: Add the cache object ID to netfs_read/write tracepoints
netfs: trace: Rejig a couple of the tracepoints
cachefiles: Fix path of the "debug" module parameter in help paragraph
netfs: trace: Change the "clear" folio traces to "endwb"
netfs: Remove the writethrough code
netfs: Use uoff_t instead of unsigned long long and loff_t
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