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476 commits

Author SHA1 Message Date
Mateusz Guzik
7e9680d3be cache: whack "set but not used" warnings 2021-11-14 16:57:43 +00:00
Konstantin Belousov
9a0bee9f6a Make vn_fullpath_hardlink() externally callable 
Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D32611
 2021-10-28 20:49:26 +03:00
Mateusz Guzik
628c3b307f cache: only let non-dir descriptors through when doing EMPTYPATH lookups 
Otherwise things like realpath against a file and '.' end up with an
illegal state of having a regular vnode for the parent.

Reported by:	syzbot+9aa5439dd9c708aeb1a8@syzkaller.appspotmail.com
 2021-10-27 18:27:47 +00:00
Mateusz Guzik
1045352f15 cache: only assert on flags when dealing with EMPTYPATH 
Reported by:	syzbot+bd48ee0843206a09e6b8@syzkaller.appspotmail.com
Fixes:		7dd419cabc ("cache: add empty path support")
 2021-10-17 08:42:47 +00:00
Mateusz Guzik
7dd419cabc cache: add empty path support 
This avoids spurious drop offs as EMPTY is passed regardless of the
actual path name.

Pushign the work inside the lookup instead of just ignorign the flag
allows avoid checking for empty pathname for all other lookups.
 2021-10-16 20:08:37 +00:00
Mateusz Guzik
b4a58fbf64 vfs: remove cn_thread 
It is always curthread.

Reviewed by:	kib
Differential Revision:	https://reviews.freebsd.org/D32453
 2021-10-11 13:21:47 +00:00
Mateusz Guzik
a2cb65b8fe cache: count vnodes in cache_purgevfs 2021-09-18 10:16:50 +00:00
Mateusz Guzik
b65ad70195 cache: retire cache_fast_revlookup sysctl 
Sponsored by:	Rubicon Communications, LLC ("Netgate")
 2021-08-23 15:31:44 +02:00
Mateusz Guzik
b30e7cb7fa cache: add OPENREAD and OPENWRITE to fast path lookup 2021-08-07 13:02:38 +02:00
Mateusz Guzik
844aa31c6d cache: add cache_enter_time_flags 2021-07-12 07:03:14 +02:00
Mateusz Guzik
12288bd999 cache: fix lockless absolute symlink traversal to non-fp mounts 
Said lookups would incorrectly fail with EOPNOTSUP.

Reported by:	kib
 2021-05-11 04:30:12 +00:00
Mark Johnston
c8bbb1272c vfs: Fix error handling in vn_fullpath_hardlink() 
vn_fullpath_any_smr() will return a positive error number if the
caller-supplied buffer isn't big enough.  In this case the error must be
propagated up, otherwise we may copy out uninitialized bytes.

Reported by:	syzkaller+KMSAN
Reviewed by:	mjg, kib
MFC aftr:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D30198
 2021-05-10 20:22:27 -04:00
Mateusz Guzik
074abaccfa cache: remove incomplete lockless lockout support during resize 
This is already properly handled thanks to 2 step hash replacement.
 2021-04-28 19:53:25 +00:00
Mateusz Guzik
4f0279e064 cache: extend mismatch vnode assert print to include the name 2021-04-15 07:55:43 +00:00
Mateusz Guzik
72b3b5a941 vfs: replace vfs_smr_quiesce with vfs_smr_synchronize 
This ends up using a smr specific method.

Suggested by:	markj
Tested by:	pho
 2021-04-08 11:14:45 +00:00
Mateusz Guzik
13b3862ee8 cache: update an assert on CACHE_FPL_STATUS_ABORTED 
Since symlink support it can get upgraded to CACHE_FPL_STATUS_DESTROYED.

Reported by:	bdrewery
 2021-04-06 22:31:58 +02:00
Mateusz Guzik
f79bd71def cache: add high level overview 
Differential Revision:	https://reviews.freebsd.org/D28675
 2021-04-02 05:11:05 +02:00
Mateusz Guzik
dc532884d5 cache: fix resizing in face of lockless lookup 
Reported by:	pho
Tested by:	pho
 2021-04-02 05:11:05 +02:00
Mateusz Guzik
1239a72221 cache: temporarily drop the assert that dvp != vp when adding an entry 
Historically it was allowed for any names, but arguably should never be
even attempted. Allow it again since there is a release pending and
allowing it is bug-compatible with previous behavior.

Reported by:	otis
 2021-02-27 22:29:50 +00:00
Mateusz Guzik
39e0c3f686 cache: assorted comment fixups 2021-02-09 17:09:44 +01:00
Mateusz Guzik
2f8a844635 cache: remove the largely obsolete general description 
Examples of inconsistencies with the current state:
- references LRU of all entries, removed years ago
- references a non-existent lock (neglist)
- claims negative entries have a NULL target

It will be replaced with a more accurate and more informative
description.

In the meantime take it out so it stops misleading.
 2021-02-06 00:28:40 +01:00
Mateusz Guzik
0e1594e60e cache: fix vfs:namecache:lookup:miss probe call sites 2021-02-06 00:28:40 +01:00
Mateusz Guzik
2e96132a7d cache: drop spurious arg from panic in cache_validate 
vp is already reported when noting mismatch
 2021-02-06 00:28:39 +01:00
Mateusz Guzik
b54ed778fe cache: comment on FNV 2021-02-06 00:13:57 +01:00
Mateusz Guzik
45456abc4c cache: fix trailing slash support in face of permission problems 
Reported by:	Johan Hendriks <joh.hendriks gmail.com>
Tested by:	kevans
 2021-02-02 18:13:51 +00:00
Mateusz Guzik
6f19dc2124 cache: add delayed degenerate path handling 2021-02-01 04:53:23 +00:00
Mateusz Guzik
bbfb1edd70 cache: move hash computation into the parsing loop 2021-02-01 04:36:45 +00:00
Mateusz Guzik
e027e24bfa cache: add trailing slash support 
Tested by:	pho
 2021-01-31 12:02:46 +00:00
Mateusz Guzik
8cbd164a17 cache: handle NOFOLLOW requests for symlinks 
Tested by:	pho
 2021-01-31 12:02:46 +00:00
Mateusz Guzik
5c325977b1 cache: add missing MNT_NOSYMFOLLOW check to symlink traversal 2021-01-27 15:08:38 +00:00
Mateusz Guzik
5fc384d181 cache: fallback when encountering a mount point during .. lookup 
The current abort is overzealous.
 2021-01-27 16:00:31 +01:00
Mateusz Guzik
a098a831a1 cache: tidy up handling of foo/bar lookups where foo is not a directory 
The code was performing an avoidable check for doomed state to account
for foo being a VDIR but turning VBAD. Now that dooming puts a vnode
in a permanent "modify" state this is no longer necessary as the final
status check will catch it.
 2021-01-26 20:42:53 +00:00
Mateusz Guzik
a51eca7936 cache: stop referring to removing entries as invalidating them 
Said use is a remnant from the old code and clashes with the NCF_INVALID
flag.
 2021-01-26 20:42:53 +00:00
Mateusz Guzik
6943671b48 cache: convert cache_fplookup_parse to void now that it always succeeds 2021-01-26 13:24:03 +01:00
Mateusz Guzik
e7cf562a40 cache: change ->v_cache_dd synchronisation rules 
Instead of resorting to seqc modification take advantage of immutability
of entries and check if the entry still matches after everything got
prepared.
 2021-01-25 22:41:13 +00:00
Mateusz Guzik
6f08427649 cache: make ->v_cache_dd accesses atomic-clean for lockless usage 2021-01-25 22:41:13 +00:00
Mateusz Guzik
6ef8fede86 cache: make ->nc_flag accesses atomic-clean for lockless usage 2021-01-25 22:41:13 +00:00
Mateusz Guzik
ffcf8f97f8 cache: store vnodes in local vars in cache_zap_locked 2021-01-25 22:41:13 +00:00
Mateusz Guzik
868643e722 cache: assorted cleanups 2021-01-25 19:45:24 +00:00
Mateusz Guzik
1c7a65adb0 cache: track calls to cache_symlink_alloc with unsupported size 
While here assert on size passed to free.
 2021-01-25 19:45:23 +00:00
Mateusz Guzik
02ec31bdf6 cache: add back target entry on rename 2021-01-23 18:10:16 +00:00
Mateusz Guzik
739ecbcf1c cache: add symlink support to lockless lookup 
Reviewed by:	kib (previous version)
Tested by:	pho (previous version)
Differential Revision:	https://reviews.freebsd.org/D27488
 2021-01-23 15:04:43 +00:00
Mateusz Guzik
2171b8e8a2 cache: augment sdt probe in cache_fplookup_dot 
Same as 6d386b4c ("cache: save a branch in cache_fplookup_next")
 2021-01-20 07:23:14 +00:00
Mateusz Guzik
aae03cfe64 cache: whitespace nit in cache_fplookup_modifying 2021-01-20 07:22:04 +00:00
Mateusz Guzik
57dab0292a cache: fix some typos 2021-01-19 10:17:14 +01:00
Mateusz Guzik
84ab77ad27 cache: drop-write only var from cache_fplookup_preparse 2021-01-19 10:13:30 +01:00
Mateusz Guzik
6d386b4c8a cache: save a branch in cache_fplookup_next 
Previously the code would branch on top find out whether it should
branch on SDT probe and bumping the numposhits counter, depending
on cache_fplookup_cross_mount.

Arguably it should be done regardless of what said function returns.
 2021-01-19 10:08:24 +01:00
Mateusz Guzik
70ba77706d vfs: extend vfs:namei:lookup:return probe with nameidata 2021-01-12 13:35:27 +00:00
Mateusz Guzik
8ddea0b127 cache: just assign ni_resflags = NIRES_ABS 
It is guaranteed to be 0 on entry.
 2021-01-08 13:57:10 +00:00
Mateusz Guzik
fee405e057 cache: stop checkpointing cn_flags 
They are only modified, if ever, for the last component.
 2021-01-07 23:29:52 +00:00