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David Howells 287fd61123 cachefiles: Implement begin and end I/O operation 
Implement the methods for beginning and ending an I/O operation.

When called to begin an I/O operation, we are guaranteed that the cookie
has reached a certain stage (we're called by fscache after it has done a
suitable wait).

If a file is available, we paste a ref over into the cache resources for
the I/O routines to use.  This means that the object can be invalidated
whilst the I/O is ongoing without the need to synchronise as the file
pointer in the object is replaced, but the file pointer in the cache
resources is unaffected.

Ending the operation just requires ditching any refs we have and dropping
the access guarantee that fscache got for us on the cookie.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/163819645033.215744.2199344081658268312.stgit@warthog.procyon.org.uk/ # v1
Link: https://lore.kernel.org/r/163906951916.143852.9531384743995679857.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/163967161222.1823006.4461476204800357263.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/164021559030.640689.3684291785218094142.stgit@warthog.procyon.org.uk/ # v4
 		2022-01-07 13:42:44 +00:00
..
9p fscache: Remove the contents of the fscache driver, pending rewrite 2022-01-07 09:22:19 +00:00
adfs mm: require ->set_page_dirty to be explicitly wired up 2021-06-29 10:53:48 -07:00
affs affs: use bdev_nr_sectors instead of open coding it 2021-10-18 14:43:22 -06:00
afs fscache: Remove the contents of the fscache driver, pending rewrite 2022-01-07 09:22:19 +00:00
autofs autofs: fix wait name hash calculation in autofs_wait() 2021-10-20 21:09:02 -04:00
befs isystem: ship and use stdarg.h 2021-08-19 09:02:55 +09:00
bfs mm: require ->set_page_dirty to be explicitly wired up 2021-06-29 10:53:48 -07:00
btrfs for-5.16-rc2-tag 2021-11-26 11:24:32 -08:00
cachefiles cachefiles: Implement begin and end I/O operation 2022-01-07 13:42:44 +00:00
ceph fscache, cachefiles: Disable configuration 2022-01-07 09:21:44 +00:00
cifs fscache, cachefiles: Disable configuration 2022-01-07 09:21:44 +00:00
coda coda: bump module version to 7.2 2021-11-09 10:02:51 -08:00
configfs configfs: fix a race in configfs_lookup() 2021-08-25 07:58:49 +02:00
cramfs cramfs: use bdev_nr_bytes instead of open coding it 2021-10-18 14:43:22 -06:00
crypto fscrypt: improve a few comments 2021-10-25 19:11:50 -07:00
debugfs debugfs: debugfs_create_file_size(): use IS_ERR to check for error 2021-09-21 09:09:06 +02:00
devpts
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dlm fs: dlm: avoid comms shutdown delay in release_lockspace 2021-09-01 11:29:14 -05:00
ecryptfs mm: require ->set_page_dirty to be explicitly wired up 2021-06-29 10:53:48 -07:00
efivarfs efivars: convert to fileattr 2021-04-12 15:04:29 +02:00
efs
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erofs erofs: fix deadlock when shrink erofs slab 2021-11-23 14:58:16 +08:00
exfat exfat: fix incorrect loading of i_blocks for large files 2021-11-01 07:49:21 +09:00
exportfs
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ext2 ext2: fix sleeping in atomic bugs on error 2021-09-22 13:05:23 +02:00
ext4 Only bug fixes and cleanups for ext4 this merge window. Of note are 2021-11-10 17:05:37 -08:00
f2fs Update to zstd-1.4.10 2021-11-13 15:32:30 -08:00
fat for-5.16/inode-sync-2021-10-29 2021-11-01 10:25:27 -07:00
freevxfs
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fscache fscache: Provide a function to resize a cookie 2022-01-07 13:40:33 +00:00
fuse fuse: release pipe buf after last use 2021-11-25 14:05:18 +01:00
gfs2 gfs2: gfs2_create_inode rework 2021-12-02 12:41:10 +01:00
hfs Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
hfsplus Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
hostfs hostfs: support splice_write 2021-08-26 22:28:02 +02:00
hpfs treewide: Replace open-coded flex arrays in unions 2021-10-18 12:28:53 -07:00
hugetlbfs mm,hugetlb: remove mlock ulimit for SHM_HUGETLB 2021-11-09 10:02:48 -08:00
iomap iomap: iomap_read_inline_data cleanup 2021-11-24 10:15:47 -08:00
isofs isofs: Fix out of bound access for corrupted isofs image 2021-10-19 12:51:02 +02:00
jbd2 jbd2: add sparse annotations for add_transaction_credits() 2021-08-30 23:36:50 -04:00
jffs2 vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
jfs Just one JFS patch 2021-11-03 09:23:25 -07:00
kernfs Merge 5.15-rc6 into driver-core-next 2021-10-18 09:43:37 +02:00
ksmbd ksmbd: fix memleak in get_file_stream_info() 2021-11-25 00:09:26 -06:00
lockd A slow cycle for nfsd: mainly cleanup, including Neil's patch dropping 2021-11-10 16:45:54 -08:00
minix mm: require ->set_page_dirty to be explicitly wired up 2021-06-29 10:53:48 -07:00
netfs netfs: Pass more information on how to deal with a hole in the cache 2022-01-07 09:22:19 +00:00
nfs fscache, cachefiles: Disable configuration 2022-01-07 09:21:44 +00:00
nfs_common nfs: Fix kerneldoc warning shown up by W=1 2021-10-04 22:02:17 +01:00
nfsd This is just one bugfix for a bufferflow in knfsd's xdr decoding. 2021-11-17 08:38:00 -08:00
nilfs2 Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
nls
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notify fanotify: Allow users to request FAN_FS_ERROR events 2021-10-27 12:53:45 +02:00
ntfs fs: ntfs: Limit NTFS_RW to page sizes smaller than 64k 2021-11-27 14:34:41 -08:00
ntfs3 gfs2: Fix mmap + page fault deadlocks 2021-11-02 12:25:03 -07:00
ocfs2 Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
omfs mm: require ->set_page_dirty to be explicitly wired up 2021-06-29 10:53:48 -07:00
openpromfs
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orangefs orangefs: three fixes from other folks... 2021-11-09 10:34:06 -08:00
overlayfs overlayfs update for 5.16 2021-11-09 10:51:12 -08:00
proc proc/vmcore: fix clearing user buffer by properly using clear_user() 2021-11-20 10:35:55 -08:00
pstore pstore/blk: Use "%lu" to format unsigned long 2021-11-21 09:44:19 -08:00
qnx4 qnx4: work around gcc false positive warning bug 2021-09-21 08:36:48 -07:00
qnx6
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quota \n 2021-11-06 16:40:48 -07:00
ramfs Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
reiserfs \n 2021-11-06 16:40:48 -07:00
romfs
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smbfs_common cifs: Move SMB2_Create definitions to the shared area 2021-11-05 09:55:36 -05:00
squashfs lib: zstd: Add kernel-specific API 2021-11-08 16:55:21 -08:00
sysfs fs/sysfs/dir.c: replace S_IRWXU|S_IRUGO|S_IXUGO with 0755 sysfs_create_dir_ns() 2021-10-05 16:35:05 +02:00
sysv sysv: use BUILD_BUG_ON instead of runtime check 2021-11-09 10:02:52 -08:00
tracefs tracefs: Have tracefs directories not set OTH permission bits by default 2021-10-08 18:08:43 -04:00
ubifs fscrypt: remove fscrypt_operations::max_namelen 2021-09-20 19:32:33 -07:00
udf udf: Fix crash after seekdir 2021-11-09 12:53:58 +01:00
ufs isystem: ship and use stdarg.h 2021-08-19 09:02:55 +09:00
unicode .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
vboxsf vboxfs: fix broken legacy mount signature checking 2021-09-27 11:26:21 -07:00
verity fs-verity: fix signed integer overflow with i_size near S64_MAX 2021-09-22 10:56:34 -07:00
xfs xfs: remove incorrect ASSERT in xfs_rename 2021-12-01 17:27:48 -08:00
zonefs gfs2: Fix mmap + page fault deadlocks 2021-11-02 12:25:03 -07:00
Kconfig cachefiles: Introduce rewritten driver 2022-01-07 13:40:39 +00:00
Kconfig.binfmt binfmt: remove support for em86 (alpha only) 2021-07-25 22:33:03 -07:00
Makefile cachefiles: Introduce rewritten driver 2022-01-07 13:40:39 +00:00
aio.c Various hardening fixes and cleanups for 5.16-rc1 2021-11-01 17:29:10 -07:00
anon_inodes.c fs: add anon_inode_getfile_secure() similar to anon_inode_getfd_secure() 2021-09-19 22:35:37 -04:00
attr.c fs: handle circular mappings correctly 2021-11-17 09:26:09 +01:00
bad_inode.c vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
binfmt_aout.c binfmt: a.out: Fix bogus semicolon 2021-09-05 10:15:05 -07:00
binfmt_elf.c Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
binfmt_elf_fdpic.c coredump: Limit coredumps to a single thread group 2021-10-08 12:06:02 -05:00
binfmt_flat.c binfmt: remove in-tree usage of MAP_EXECUTABLE 2021-06-29 10:53:50 -07:00
binfmt_misc.c
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binfmt_script.c
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buffer.c fs: simplify init_page_buffers 2021-10-18 14:43:22 -06:00
char_dev.c
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compat_binfmt_elf.c
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coredump.c coredump: Limit coredumps to a single thread group 2021-10-08 12:06:02 -05:00
d_path.c d_path: fix Kernel doc validator complaining 2021-11-06 13:30:32 -07:00
dax.c New code for 5.15: 2021-08-31 11:13:35 -07:00
dcache.c useful constants: struct qstr for ".." 2021-04-15 22:36:45 -04:00
direct-io.c fs: get rid of the res2 iocb->ki_complete argument 2021-10-25 10:36:24 -06:00
drop_caches.c fs: drop_caches: fix skipping over shadow cache inodes 2021-09-03 09:58:10 -07:00
eventfd.c eventfd: Export eventfd_wake_count to modules 2021-09-06 07:20:56 -04:00
eventpoll.c ARM development updates for 5.15: 2021-09-09 13:25:49 -07:00
exec.c Merge branch 'exit-cleanups-for-v5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2021-11-10 16:15:54 -08:00
fcntl.c Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
fhandle.c
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file.c fget: check that the fd still exists after getting a ref to it 2021-12-03 10:06:58 -08:00
file_table.c
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filesystems.c fs: simplify get_filesystem_list / get_all_fs_names 2021-08-23 01:25:40 -04:00
fs-writeback.c vfs, fscache: Implement pinning of cache usage for writeback 2022-01-07 09:22:19 +00:00
fs_context.c memcg: charge fs_context and legacy_fs_context 2021-09-03 09:58:12 -07:00
fs_parser.c namei: Standardize callers of filename_lookup() 2021-09-07 16:07:47 -04:00
fs_pin.c
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fs_struct.c
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fs_types.c
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fsopen.c
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init.c
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inode.c fs: Remove FS_THP_SUPPORT 2021-11-17 10:36:35 -05:00
internal.h Merge branch 'akpm' (patches from Andrew) 2021-11-09 10:11:53 -08:00
io-wq.c io-wq: don't retry task_work creation failure on fatal conditions 2021-12-03 06:27:32 -07:00
io-wq.h io_uring: optimise INIT_WQ_LIST 2021-10-19 05:49:54 -06:00
io_uring.c io_uring: Fix undefined-behaviour in io_issue_sqe 2021-11-27 06:41:38 -07:00
ioctl.c New code for 5.15: 2021-08-31 11:06:32 -07:00
kernel_read_file.c vfs: check fd has read access in kernel_read_file_from_fd() 2021-10-18 20:22:03 -10:00
libfs.c libfs: Support RENAME_EXCHANGE in simple_rename() 2021-11-03 15:43:08 +01:00
locks.c locks: remove changelog comments 2021-10-19 14:11:39 -04:00
mbcache.c
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mount.h
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mpage.c
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namei.c vfs, cachefiles: Mark a backing file in use with an inode flag 2022-01-07 13:41:32 +00:00
namespace.c Merge branch 'akpm' (patches from Andrew) 2021-09-03 10:08:28 -07:00
no-block.c
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nsfs.c
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open.c Merge branch 'akpm' (patches from Andrew) 2021-11-06 14:08:17 -07:00
pipe.c Revert "mm/gup: remove try_get_page(), call try_get_compound_head() directly" 2021-09-07 11:03:45 -07:00
pnode.c
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pnode.h
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posix_acl.c fs/posix_acl.c: avoid -Wempty-body warning 2021-11-06 13:30:32 -07:00
proc_namespace.c
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read_write.c fs: remove leftover comments from mandatory locking removal 2021-10-26 12:20:50 -04:00
readdir.c readdir: make sure to verify directory entry for legacy interfaces too 2021-04-17 11:39:49 -07:00
remap_range.c fs: remove mandatory file locking support 2021-08-23 06:15:36 -04:00
select.c Revert "memcg: enable accounting for pollfd and select bits arrays" 2021-09-07 11:26:23 -07:00
seq_file.c seq_file: move seq_escape() to a header 2021-11-09 10:02:52 -08:00
signalfd.c signal: Rename SIL_PERF_EVENT SIL_FAULT_PERF_EVENT for consistency 2021-07-23 13:16:43 -05:00
splice.c
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stack.c
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stat.c fs: add generic helper for filling statx attribute flags 2021-08-17 11:47:43 +02:00
statfs.c
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super.c fs: explicitly unregister per-superblock BDIs 2021-11-06 13:30:34 -07:00
sync.c block: simplify the block device syncing code 2021-10-22 08:36:55 -06:00
timerfd.c timerfd: Provide timerfd_resume() 2021-08-10 17:57:22 +02:00
userfaultfd.c userfaultfd: fix a race between writeprotect and exit_mmap() 2021-10-18 20:22:02 -10:00
utimes.c
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xattr.c
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