Al Viro d8d4611a4f link_path_walk(): simplify stack handling ... We use nd->stack to store two things: pinning down the symlinks we are resolving and resuming the name traversal when a nested symlink is finished. Currently, nd->depth is used to keep track of both. It's 0 when we call link_path_walk() for the first time (for the pathname itself) and 1 on all subsequent calls (for trailing symlinks, if any). That's fine, as far as pinning symlinks goes - when handling a trailing symlink, the string we are interpreting is the body of symlink pinned down in nd->stack[0]. It's rather inconvenient with respect to handling nested symlinks, though - when we run out of a string we are currently interpreting, we need to decide whether it's a nested symlink (in which case we need to pick the string saved back when we started to interpret that nested symlink and resume its traversal) or not (in which case we are done with link_path_walk()). Current solution is a bit of a kludge - in handling of trailing symlink (in lookup_last() and open_last_lookups() we clear nd->stack[0].name. That allows link_path_walk() to use the following rules when running out of a string to interpret: * if nd->depth is zero, we are at the end of pathname itself. * if nd->depth is positive, check the saved string; for nested symlink it will be non-NULL, for trailing symlink - NULL. It works, but it's rather non-obvious. Note that we have two sets: the set of symlinks currently being traversed and the set of postponed pathname tails. The former is stored in nd->stack[0..nd->depth-1].link and it's valid throught the pathname resolution; the latter is valid only during an individual call of link_path_walk() and it occupies nd->stack[0..nd->depth-1].name for the first call of link_path_walk() and nd->stack[1..nd->depth-1].name for subsequent ones. The kludge is basically a way to recognize the second set becoming empty. The things get simpler if we keep track of the second set's size explicitly and always store it in nd->stack[0..depth-1].name. We access the second set only inside link_path_walk(), so its size can live in a local variable; that way the check becomes trivial without the need of that kludge. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2020-03-13 21:09:12 -04:00
..
9p	9p pull request for inclusion in 5.4	2019-09-27 15:10:34 -07:00
adfs	fs/adfs: bigdir: Fix an error code in adfs_fplus_read()	2020-01-25 11:31:59 -05:00
affs	affs: fix a memory leak in affs_remount	2019-11-18 14:26:43 +01:00
afs	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
autofs	LOOKUP_MOUNTPOINT: fold path_mountpointat() into path_lookupat()	2020-03-13 21:08:17 -04:00
befs	fs: Fill in max and min timestamps in superblock	2019-08-30 07:27:17 -07:00
bfs	fs: Fill in max and min timestamps in superblock	2019-08-30 07:27:17 -07:00
btrfs	for-5.6-tag	2020-02-03 17:03:42 +00:00
cachefiles	cachefiles: drop direct usage of ->bmap method.	2020-02-03 08:05:56 -05:00
ceph	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
cifs	13 cifs/smb3 patches most from testing at the SMB3 plugfest this week	2020-02-09 13:27:17 -08:00
coda	y2038: add inode timestamp clamping	2019-09-19 09:42:37 -07:00
configfs	utimes: Clamp the timestamps in notify_change()	2019-12-08 19:10:50 -05:00
cramfs	cramfs: switch to use of errofc() et.al.	2020-02-07 14:48:41 -05:00
crypto	fscrypt: improve format of no-key names	2020-01-22 14:50:03 -08:00
debugfs	Merge branch 'work.recursive_removal' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-05 05:09:46 +00:00
devpts	devpts_pty_kill(): don't bother with d_delete()	2019-09-03 09:30:56 -04:00
dlm	dlm: use SO_SNDTIMEO_NEW instead of SO_SNDTIMEO_OLD	2019-12-18 18:07:31 +01:00
ecryptfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:04:49 -08:00
efivarfs	Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-07-19 10:42:02 -07:00
efs	fs: Fill in max and min timestamps in superblock	2019-08-30 07:27:17 -07:00
erofs	erofs: clean up z_erofs_submit_queue()	2020-01-21 16:46:23 +08:00
exportfs	race in exportfs_decode_fh()	2019-11-11 09:21:59 -05:00
ext2	ext2: Adjust indentation in ext2_fill_super	2020-01-06 10:09:35 +01:00
ext4	treewide: remove redundant IS_ERR() before error code check	2020-02-04 03:05:27 +00:00
f2fs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:04:49 -08:00
fat	Merge branch 'imm.timestamp' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-05 05:02:42 +00:00
freevxfs	fs: Fill in max and min timestamps in superblock	2019-08-30 07:27:17 -07:00
fscache	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
fuse	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
gfs2	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
hfs	hfs/hfsplus: use 64-bit inode timestamps	2019-12-18 18:07:32 +01:00
hfsplus	hfs/hfsplus: use 64-bit inode timestamps	2019-12-18 18:07:32 +01:00
hostfs	hostfs: pass 64-bit timestamps to/from user space	2019-12-18 18:07:32 +01:00
hpfs	fs: compat_ioctl: move FITRIM emulation into file systems	2019-10-23 17:23:46 +02:00
hugetlbfs	hugetlbfs: switch to use of invalfc()	2020-02-07 14:48:42 -05:00
iomap	fs: Fix page_mkwrite off-by-one errors	2020-01-06 08:58:23 -08:00
isofs	y2038: add inode timestamp clamping	2019-09-19 09:42:37 -07:00
jbd2	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:04:49 -08:00
jffs2	fs_parse: fold fs_parameter_desc/fs_parameter_spec	2020-02-07 14:48:37 -05:00
jfs	Trivial cleanup for jfs	2020-02-05 05:28:20 +00:00
kernfs	Merge branch 'imm.timestamp' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-05 05:02:42 +00:00
lockd	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
minix	fs: Fill in max and min timestamps in superblock	2019-08-30 07:27:17 -07:00
nfs	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
nfs_common
nfsd	Highlights:	2020-02-07 17:50:21 -08:00
nilfs2	fs: compat_ioctl: move FITRIM emulation into file systems	2019-10-23 17:23:46 +02:00
nls
notify	fs: call fsnotify_sb_delete after evict_inodes	2019-12-18 00:03:01 -05:00
ntfs	utimes: Clamp the timestamps in notify_change()	2019-12-08 19:10:50 -05:00
ocfs2	treewide: remove redundant IS_ERR() before error code check	2020-02-04 03:05:27 +00:00
omfs	fs: omfs: Initialize filesystem timestamp ranges	2019-08-30 08:11:25 -07:00
openpromfs	Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-07-19 10:42:02 -07:00
orangefs	help_next should increase position index	2020-02-04 15:22:04 -05:00
overlayfs	ovl: fix lseek overflow on 32bit	2020-02-03 11:41:53 +01:00
proc	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
pstore	pstore/ram: Regularize prz label allocation lifetime	2020-01-08 17:05:45 -08:00
qnx4	fs: Fill in max and min timestamps in superblock	2019-08-30 07:27:17 -07:00
qnx6	fs: Fill in max and min timestamps in superblock	2019-08-30 07:27:17 -07:00
quota	\n	2020-01-30 15:37:41 -08:00
ramfs	fs_parse: fold fs_parameter_desc/fs_parameter_spec	2020-02-07 14:48:37 -05:00
reiserfs	Merge branch 'akpm' (patches from Andrew)	2020-01-31 12:16:36 -08:00
romfs	Merge branch 'work.mount2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-09-19 10:06:57 -07:00
squashfs	Merge branch 'work.mount2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-09-19 10:06:57 -07:00
sysfs	treewide: remove redundant IS_ERR() before error code check	2020-02-04 03:05:27 +00:00
sysv	fs: sysv: Initialize filesystem timestamp ranges	2019-08-30 07:27:18 -07:00
tracefs	simple_recursive_removal(): kernel-side rm -rf for ramfs-style filesystems	2019-12-10 22:29:58 -05:00
ubifs	Merge branch 'imm.timestamp' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-05 05:02:42 +00:00
udf	udf: Clarify meaning of f_files in udf_statfs	2020-01-20 13:59:41 +01:00
ufs	y2038: add inode timestamp clamping	2019-09-19 09:42:37 -07:00
unicode	kbuild: rename hostprogs-y/always to hostprogs/always-y	2020-02-04 01:53:07 +09:00
vboxsf	fs: Add VirtualBox guest shared folder (vboxsf) support	2020-02-08 17:34:58 -05:00
verity	fs-verity: use u64_to_user_ptr()	2020-01-14 13:28:28 -08:00
xfs	Merge branch 'merge.nfs-fs_parse.1' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:26:41 -08:00
zonefs	fs: New zonefs file system	2020-02-07 14:39:38 +09:00
aio.c	aio: prevent potential eventfd recursion on poll	2020-02-03 17:27:47 -07:00
anon_inodes.c	Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-07-19 10:42:02 -07:00
attr.c	utimes: Clamp the timestamps in notify_change()	2019-12-08 19:10:50 -05:00
bad_inode.c
binfmt_aout.c
binfmt_elf.c	fs/binfmt_elf.c: coredump: allow process with empty address space to coredump	2020-01-31 10:30:41 -08:00
binfmt_elf_fdpic.c	y2038: elfcore: Use __kernel_old_timeval for process times	2019-11-15 14:38:29 +01:00
binfmt_em86.c
binfmt_flat.c	fs/binfmt_flat.c: remove set but not used variable 'inode'	2019-07-16 19:23:22 -07:00
binfmt_misc.c	Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-07-19 10:42:02 -07:00
binfmt_script.c
block_dev.c	block: don't send uevent for empty disk when not invalidating	2019-12-02 18:49:30 -07:00
buffer.c	smp: Remove allocation mask from on_each_cpu_cond.*()	2020-01-24 20:40:09 +01:00
char_dev.c	chardev: Avoid potential use-after-free in 'chrdev_open()'	2020-01-06 20:10:26 +01:00
compat.c
compat_binfmt_elf.c	y2038: elfcore: Use __kernel_old_timeval for process times	2019-11-15 14:38:29 +01:00
coredump.c	pipe: use exclusive waits when reading or writing	2020-02-08 11:39:19 -08:00
d_path.c	[PATCH] fix d_absolute_path() interplay with fsmount()	2019-08-30 19:31:09 -04:00
dax.c	New code for 5.5:	2019-11-30 10:44:49 -08:00
dcache.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-12-08 11:08:28 -08:00
dcookies.c
direct-io.c	fs/direct-io.c: include fs/internal.h for missing prototype	2020-01-04 13:55:09 -08:00
drop_caches.c	fs: avoid softlockups in s_inodes iterators	2019-12-18 00:03:01 -05:00
eventfd.c	eventfd: track eventfd_signal() recursion depth	2020-02-03 17:27:38 -07:00
eventpoll.c	eventpoll: support non-blocking do_epoll_ctl() calls	2020-01-29 15:45:47 -07:00
exec.c	Merge branch 'akpm' (patches from Andrew)	2020-01-31 12:16:36 -08:00
fcntl.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-12-08 11:08:28 -08:00
fhandle.c	fs/handle.c - fix up kerneldoc	2019-08-07 21:51:47 -04:00
file.c	threads-v5.6	2020-01-29 19:38:34 -08:00
file_table.c	vfs: Export flush_delayed_fput for use by knfsd.	2019-08-19 11:00:39 -04:00
filesystems.c	fs_parser: remove fs_parameter_description name field	2020-02-07 14:48:36 -05:00
fs-writeback.c	memcg: fix a crash in wb_workfn when a device disappears	2020-01-31 10:30:36 -08:00
fs_context.c	add prefix to fs_context->log	2020-02-07 14:48:35 -05:00
fs_parser.c	turn fs_param_is_... into functions	2020-02-07 14:48:38 -05:00
fs_pin.c	switch the remnants of releasing the mountpoint away from fs_pin	2019-07-16 22:52:37 -04:00
fs_struct.c
fs_types.c
fsopen.c	add prefix to fs_context->log	2020-02-07 14:48:35 -05:00
inode.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-02-08 13:04:49 -08:00
internal.h	LOOKUP_MOUNTPOINT: fold path_mountpointat() into path_lookupat()	2020-03-13 21:08:17 -04:00
io-wq.c	io_uring: fix linked command file table usage	2020-01-29 13:46:44 -07:00
io-wq.h	io_uring: fix linked command file table usage	2020-01-29 13:46:44 -07:00
io_uring.c	io_uring-5.6-2020-02-05	2020-02-06 06:33:17 +00:00
ioctl.c	compat-ioctl fix for v5.6	2020-02-08 13:44:41 -08:00
Kconfig	fs: New zonefs file system	2020-02-09 15:51:46 -08:00
Kconfig.binfmt
libfs.c	simple_recursive_removal(): kernel-side rm -rf for ramfs-style filesystems	2019-12-10 22:29:58 -05:00
locks.c	locks: print unsigned ino in /proc/locks	2019-12-29 09:00:58 -05:00
Makefile	fs: New zonefs file system	2020-02-09 15:51:46 -08:00
mbcache.c
mount.h	switch the remnants of releasing the mountpoint away from fs_pin	2019-07-16 22:52:37 -04:00
mpage.c	fs: move guard_bio_eod() after bio_set_op_attrs	2020-01-09 08:16:12 -07:00
namei.c	link_path_walk(): simplify stack handling	2020-03-13 21:09:12 -04:00
namespace.c	LOOKUP_MOUNTPOINT: fold path_mountpointat() into path_lookupat()	2020-03-13 21:08:17 -04:00
no-block.c
nsfs.c	Merge branch 'work.openat2' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2020-01-29 11:20:24 -08:00
open.c	make build_open_flags() treat O_CREAT | O_EXCL as implying O_NOFOLLOW	2020-02-27 14:43:56 -05:00
pipe.c	pipe: use exclusive waits when reading or writing	2020-02-08 11:39:19 -08:00
pnode.c
pnode.h
posix_acl.c	fs/posix_acl.c: fix kernel-doc warnings	2020-01-04 13:55:09 -08:00
proc_namespace.c	vfs: subtype handling moved to fuse	2019-09-06 21:28:49 +02:00
read_write.c	overlayfs update for 5.6	2020-02-04 11:45:21 +00:00
readdir.c	readdir: make user_access_begin() use the real access range	2020-01-23 10:15:28 -08:00
select.c	y2038: syscalls: change remaining timeval to __kernel_old_timeval	2019-11-15 14:38:29 +01:00
seq_file.c	seq_file: fix problem when seeking mid-record	2019-08-13 16:06:52 -07:00
signalfd.c
splice.c	pipe: use exclusive waits when reading or writing	2020-02-08 11:39:19 -08:00
stack.c	sched/rt, fs: Use CONFIG_PREEMPTION	2019-12-08 14:37:36 +01:00
stat.c	fs: make two stat prep helpers available	2020-01-20 17:03:54 -07:00
statfs.c	vfs: Fix EOVERFLOW testing in put_compat_statfs64	2019-10-03 14:21:35 -07:00
super.c	fs: call fsnotify_sb_delete after evict_inodes	2019-12-18 00:03:01 -05:00
sync.c
timerfd.c	timerfd: Make timerfd_settime() time namespace aware	2020-01-14 12:20:53 +01:00
userfaultfd.c	Merge branch 'akpm' (patches from Andrew)	2019-12-01 20:36:41 -08:00
utimes.c	utimes: Clamp the timestamps in notify_change()	2019-12-08 19:10:50 -05:00
xattr.c