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linux_dsm_epyc7002/fs
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Hans de Goede 163fa2c887 vboxsf: Add support for the atomic_open directory-inode op 
commit 52dfd86aa568e433b24357bb5fc725560f1e22d8 upstream.

Opening a new file is done in 2 steps on regular filesystems:

1. Call the create inode-op on the parent-dir to create an inode
to hold the meta-data related to the file.
2. Call the open file-op to get a handle for the file.

vboxsf however does not really use disk-backed inodes because it
is based on passing through file-related system-calls through to
the hypervisor. So both steps translate to an open(2) call being
passed through to the hypervisor. With the handle returned by
the first call immediately being closed again.

Making 2 open calls for a single open(..., O_CREATE, ...) calls
has 2 problems:

a) It is not really efficient.
b) It actually breaks some apps.

An example of b) is doing a git clone inside a vboxsf mount.
When git clone tries to create a tempfile to store the pak
files which is downloading the following happens:

1. vboxsf_dir_mkfile() gets called with a mode of 0444 and succeeds.
2. vboxsf_file_open() gets called with file->f_flags containing
O_RDWR. When the host is a Linux machine this fails because doing
a open(..., O_RDWR) on a file which exists and has mode 0444 results
in an -EPERM error.

Other network-filesystems and fuse avoid the problem of needing to
pass 2 open() calls to the other side by using the atomic_open
directory-inode op.

This commit fixes git clone not working inside a vboxsf mount,
by adding support for the atomic_open directory-inode op.
As an added bonus this should also make opening new files faster.

The atomic_open implementation is modelled after the atomic_open
implementations from the 9p and fuse code.

Fixes: 0fd1695766 ("fs: Add VirtualBox guest shared folder (vboxsf) support")
Reported-by: Ludovic Pouzenc <bugreports@pouzenc.fr>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-07-05 18:54:41 +02:00
..
9p fs: 9p: add generic splice_write file operation 2020-12-01 21:40:47 +01:00
adfs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
affs fs/affs: release old buffer head on error path 2021-03-04 11:38:37 +01:00
afs afs: Fix tracepoint string placement with built-in AFS 2021-07-28 14:35:41 +02:00
aufs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
autofs autofs: harden ioctl table 2020-10-16 11:11:22 -07:00
befs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
bfs bfs: don't use WARNING: string when it's just info. 2021-01-06 14:56:52 +01:00
btrfs btrfs: fix lost inode on log replay after mix of fsync, rename and inode eviction 2024-07-05 18:07:24 +02:00
cachefiles fs/cachefiles: Remove wait_bit_key layout dependency 2021-03-30 14:32:07 +02:00
ceph init: add dsm gpl source 2024-07-05 18:00:04 +02:00
cifs cifs: create sd context must be a multiple of 8 2024-07-05 18:53:59 +02:00
coda
configfs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
cramfs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
crypto fscrypt: fix derivation of SipHash keys on big endian CPUs 2021-07-14 16:56:53 +02:00
debugfs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
devpts
dlm fs: dlm: fix memory leak when fenced 2021-07-14 16:55:59 +02:00
ecryptfs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
efivarfs efivarfs: revert "fix memory leak in efivarfs_create()" 2020-11-25 16:55:02 +01:00
efs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
erofs erofs: fix error return code in erofs_read_superblock() 2021-07-14 16:56:53 +02:00
exfat init: add dsm gpl source 2024-07-05 18:00:04 +02:00
exportfs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
ext2 Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
ext4 ext4: fix potential htree corruption when growing large_dir directories 2024-07-05 18:52:29 +02:00
f2fs f2fs: Show casefolding support only when supported 2021-07-25 14:36:17 +02:00
fat init: add dsm gpl source 2024-07-05 18:00:04 +02:00
freevxfs
fscache
fuse init: add dsm gpl source 2024-07-05 18:00:04 +02:00
gfs2 gfs2: Fix error handling in init_statfs 2021-07-14 16:55:38 +02:00
hfs hfs: add lock nesting notation to hfs_find_init 2021-07-31 08:16:12 +02:00
hfsplus init: add dsm gpl source 2024-07-05 18:00:04 +02:00
hostfs hostfs: fix memory handling in follow_link() 2021-04-14 08:42:06 +02:00
hpfs [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
hugetlbfs hugetlbfs: fix mount mode command line processing 2021-07-28 14:35:46 +02:00
iomap init: add dsm gpl source 2024-07-05 18:00:04 +02:00
isofs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
jbd2 ext4: fix debug format string warning 2021-05-19 10:13:19 +02:00
jffs2 jffs2: check the validity of dstlen in jffs2_zlib_compress() 2021-05-11 14:47:36 +02:00
jfs fs/jfs: Fix missing error code in lmLogInit() 2021-07-20 16:05:40 +02:00
kernfs kernfs: wire up ->splice_read and ->splice_write 2021-01-27 11:55:29 +01:00
lockd init: add dsm gpl source 2024-07-05 18:00:04 +02:00
minix [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
nfs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
nfs_common nfs_common: need lock during iterate through the list 2020-12-30 11:53:45 +01:00
nfsd init: add dsm gpl source 2024-07-05 18:00:04 +02:00
nilfs2 nilfs2: fix memory leak in nilfs_sysfs_delete_device_group 2021-06-30 08:47:24 -04:00
nls
notify init: add dsm gpl source 2024-07-05 18:00:04 +02:00
ntfs ntfs: fix validity check for file name attribute 2021-07-14 16:55:38 +02:00
ocfs2 ocfs2: issue zeroout to EOF blocks 2024-07-05 18:03:15 +02:00
omfs fs: omfs: use kmemdup() rather than kmalloc+memcpy 2020-09-22 23:39:45 -04:00
openpromfs
orangefs orangefs: fix orangefs df output. 2021-07-20 16:05:48 +02:00
overlayfs init: add dsm gpl source 2024-07-05 18:00:04 +02:00
proc init: add dsm gpl source 2024-07-05 18:00:04 +02:00
pstore init: add dsm gpl source 2024-07-05 18:00:04 +02:00
qnx4 [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
qnx6 [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
quota init: add dsm gpl source 2024-07-05 18:00:04 +02:00
ramfs ramfs: fix nommu mmap with gaps in the page cache 2020-10-16 11:11:22 -07:00
reiserfs reiserfs: check directory items on read from disk 2024-07-05 18:52:32 +02:00
romfs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
squashfs squashfs: fix divide error in calculate_skip() 2021-05-19 10:13:10 +02:00
sysfs sysfs: Add sysfs_emit and sysfs_emit_at to format sysfs output 2020-10-02 12:02:30 +02:00
sysv [PATCH] reduce boilerplate in fsid handling 2020-09-18 16:45:50 -04:00
tracefs
ubifs ubifs: Set/Clear I_LINKABLE under i_lock for whiteout inode 2021-07-20 16:05:51 +02:00
udf init: add dsm gpl source 2024-07-05 18:00:04 +02:00
ufs Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-10-24 12:26:05 -07:00
unicode unicode: Add utf8_casefold_hash 2020-09-10 14:03:31 -07:00
vboxsf vboxsf: Add support for the atomic_open directory-inode op 2024-07-05 18:54:41 +02:00
verity
xfs xfs: fix return of uninitialized value in variable error 2021-05-14 09:50:34 +02:00
zonefs zonefs: fix to update .i_wr_refcnt correctly in zonefs_open_zone() 2021-03-25 09:04:05 +01:00
aio.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
anon_inodes.c
attr.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
bad_inode.c
binfmt_aout.c
binfmt_elf_fdpic.c binfmt_elf, binfmt_elf_fdpic: use a VMA list snapshot 2020-10-16 11:11:21 -07:00
binfmt_elf.c fs: Replace zero-length array with flexible-array member 2020-10-29 17:22:59 -05:00
binfmt_em86.c
binfmt_flat.c binfmt_flat: revert "binfmt_flat: don't offset the data start" 2020-08-24 08:49:13 +10:00
binfmt_misc.c binfmt_misc: fix possible deadlock in bm_register_write 2021-03-17 17:06:35 +01:00
binfmt_script.c
block_dev.c block: fix a race between del_gendisk and BLKRRPART 2021-06-03 09:00:45 +02:00
buffer.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
char_dev.c
compat_binfmt_elf.c
coredump.c coredump: fix core_pattern parse error 2020-12-06 10:19:07 -08:00
d_path.c fs: fix NULL dereference due to data race in prepend_path() 2020-10-14 14:54:45 -07:00
dax.c dax: fix ENOMEM handling in grab_mapping_entry() 2021-07-14 16:56:13 +02:00
dcache.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
dcookies.c
direct-io.c fs: direct-io: fix missing sdio->boundary 2021-04-14 08:41:58 +02:00
drop_caches.c
eventfd.c
eventpoll.c fs/epoll: restore waking from ep_done_scan() 2021-05-11 14:47:12 +02:00
exec.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
fcntl.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
fhandle.c
file_table.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
file.c kernel/io_uring: cancel io_uring before task works 2021-01-30 13:55:18 +01:00
filesystems.c
fs_context.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
fs_parser.c fs_parse: mark fs_param_bad_value() as static 2020-10-13 18:38:27 -07:00
fs_pin.c
fs_struct.c vfs: Use sequence counter with associated spinlock 2020-07-29 16:14:27 +02:00
fs_types.c
fs-writeback.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
fsopen.c treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
init.c init: add an init_dup helper 2020-08-04 21:02:38 -04:00
inode.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
internal.h init: add dsm gpl source 2024-07-05 18:00:04 +02:00
io_uring.c io_uring: fix null-ptr-deref in io_sq_offload_start() 2024-07-05 18:02:24 +02:00
io-wq.c io_uring: fix false WARN_ONCE 2021-07-19 09:44:51 +02:00
io-wq.h io_uring: always batch cancel in *cancel_files() 2021-02-13 13:54:56 +01:00
ioctl.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
Kconfig init: add dsm gpl source 2024-07-05 18:00:04 +02:00
Kconfig.binfmt
kernel_read_file.c fs/kernel_file_read: Add "offset" arg for partial reads 2020-10-05 13:37:04 +02:00
libfs.c libfs: fix error cast of negative value in simple_attr_write() 2020-11-22 10:48:22 -08:00
locks.c Revert "nfsd4: a client's own opens needn't prevent delegations" 2021-03-20 10:43:44 +01:00
Makefile init: add dsm gpl source 2024-07-05 18:00:04 +02:00
mbcache.c
mount.h init: add dsm gpl source 2024-07-05 18:00:04 +02:00
mpage.c
namei.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
namespace.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
no-block.c
nsfs.c
open.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
pipe.c pipe: increase minimum default pipe size to 2 pages 2024-07-05 18:52:29 +02:00
pnode.c
pnode.h mount: fix mounting of detached mounts onto targets that reside on shared mounts 2021-03-17 17:06:13 +01:00
posix_acl.c
proc_namespace.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
read_write.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
readdir.c readdir: make sure to verify directory entry for legacy interfaces too 2021-04-21 13:00:54 +02:00
remap_range.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
select.c kernel, fs: Introduce and use set_restart_fn() and arch_set_restart_data() 2021-03-25 09:04:16 +01:00
seq_file.c seq_file: disallow extremely large seq buffer allocations 2021-07-20 16:05:59 +02:00
signalfd.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
splice.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
stack.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
stat.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
statfs.c Add a "nosymfollow" mount option. 2020-08-27 16:06:47 -04:00
super.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
sync.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
syno_acl_api.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
syno_acl.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
syno_acl.h init: add dsm gpl source 2024-07-05 18:00:04 +02:00
timerfd.c
userfaultfd.c userfaultfd: do not untag user pointers 2021-07-28 14:35:46 +02:00
utimes.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00
xattr.c init: add dsm gpl source 2024-07-05 18:00:04 +02:00