v4 Add FUSE Passthrough Support · Pull Request !16348 · openEuler/kernel

PR sync from: Yifan Qiao <qiaoyifan4@huawei.com>
https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/O3E3F5XXMO7HU5HMKET6WBVL34DQCZZ2/ 
Changes since v3:
 - Fix potential deadlock of callers of direct_splice_actor

Changes since v2:
 - Add CONFIG_FUSE_PASSTHROUGH=y to openeuler_defconfig for x86_64

Changes since v1:
 - Add CONFIG_FUSE_PASSTHROUGH=y to openeuler_defconfig for arm64

Amir Goldstein (60):
  fs: rename __mnt_{want,drop}_write*() helpers
  fs: export mnt_{get,put}_write_access() to modules
  fuse: factor out helper fuse_truncate_update_attr()
  fuse: allocate ff->release_args only if release is needed
  fuse: break up fuse_open_common()
  fuse: prepare for failing open response
  fuse: allow parallel dio writes with FUSE_DIRECT_IO_ALLOW_MMAP
  ovl: use simpler function to convert iocb to rw flags
  ovl: propagate IOCB_APPEND flag on writes to realfile
  ovl: punt write aio completion to workqueue
  ovl: protect copying of realinode attributes to ovl inode
  fs: get mnt_writers count for an open backing file's real path
  fs: create helper file_user_path() for user displayed mapped file path
  fs: store real path instead of fake path in backing file f_path
  ovl: add helper ovl_file_modified()
  ovl: split ovl_want_write() into two helpers
  ovl: reorder ovl_want_write() after ovl_inode_lock()
  ovl: do not open/llseek lower file with upper sb_writers held
  ovl: do not encode lower fh with upper sb_writers held
  ovl: add permission hooks outside of do_splice_direct()
  splice: remove permission hook from do_splice_direct()
  splice: move permission hook out of splice_direct_to_actor()
  splice: move permission hook out of splice_file_to_pipe()
  splice: remove permission hook from iter_file_splice_write()
  remap_range: move permission hooks out of do_clone_file_range()
  remap_range: move file_start_write() to after permission hook
  btrfs: move file_start_write() to after permission hook
  coda: change locking order in coda_file_write_iter()
  fs: move file_start_write() into vfs_iter_write()
  fs: move permission hook out of do_iter_write()
  fs: move permission hook out of do_iter_read()
  fs: move kiocb_start_write() into vfs_iocb_iter_write()
  fs: create __sb_write_started() helper
  fs: create file_write_started() helper
  fs: create {sb,file}_write_not_started() helpers
  fs: prepare for stackable filesystems backing file helpers
  fs: factor out backing_file_{read,write}_iter() helpers
  fs: factor out backing_file_splice_{read,write}() helpers
  fs: factor out backing_file_mmap() helper
  fuse: factor out helper for FUSE_DEV_IOC_CLONE
  fuse: introduce FUSE_PASSTHROUGH capability
  fuse: implement ioctls to manage backing files
  fuse: implement read/write passthrough
  fuse: implement splice read/write passthrough
  fuse: implement passthrough for mmap
  fuse: verify zero padding in fuse_backing_map
  fuse: respect FOPEN_KEEP_CACHE on opendir
  ovl: fix dentry reference leak after changes to underlying layers
  ovl: relax WARN_ON in ovl_verify_area()
  remap_range: merge do_clone_file_range() into vfs_clone_file_range()
  fs: pass offset and result to backing_file end_write() callback
  fuse: update inode size after extending passthrough write
  fs: fork splice_file_range() from do_splice_direct()
  fs: move file_start_write() into direct_splice_actor()
  fs: use do_splice_direct() for nfsd/ksmbd server-side-copy

Bernd Schubert (3):
  fuse: create helper function if DIO write needs exclusive lock
  fuse: add fuse_dio_lock/unlock helper functions
  fuse: disable the combination of passthrough and writeback cache

Ed Tsai (1):
  backing-file: convert to using fops->splice_write

Vegard Nossum (1):
  fs: fix __sb_write_started() kerneldoc formatting

yangyun (1):
  fuse: use exclusive lock when FUSE_I_CACHE_IO_MODE is set

https://gitee.com/src-openeuler/kernel/issues/IBHLU4

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