src/sys/fs/pseudofs, branch stable/13

pseudofs: fix off by one in hash iteration in pfs_purge

2023-11-24T19:47:15Z

Sponsored by: Dell Technologies Differential Revision: https://reviews.freebsd.org/D42628 (cherry picked from commit e0d0f0930ee22af7bf38d28d8590d4e6c822871d)

sys: Remove $FreeBSD$: one-line .c pattern

2023-08-23T17:43:25Z

Remove /^[\s*]*__FBSDID$"\$FreeBSD\$"$;?\s*\n/ Similar commit in current: (cherry picked from commit 685dc743dc3b)

sys: Remove $FreeBSD$: two-line .h pattern

2023-08-23T17:43:20Z

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/ Similar commit in current: (cherry picked from commit 95ee2897e98f)

pseudofs: Fix a potential out-of-bounds access in pfs_lookup()

2023-07-07T18:46:08Z

pseudofs nodes store their name in a flexible array member, so the node allocation is sized using the length of the name, including a nul terminator. pfs_lookup() scans a directory of nodes, comparing names to find a match. The comparison was incorrect and assumed that all node names were at least as long as the name being looked up, which of course isn't true. I believe the bug is mostly harmless since it cannot result in false positive or negative matches from the lookup, but it triggers a KASAN check. Reported by: pho Reviewed by: kib, Olivier Certner MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D40692 (cherry picked from commit fc915f1be145a52c53f6f1c37525043216e32bb8)

pseudofs: Simplify pfs_visible_proc

2023-06-29T08:15:17Z

Reviewed by: des Differential revision: https://reviews.freebsd.org/D39383 MFC after: 1 month (cherry picked from commit a32ed5ec05d9bc01b8e70b45ff510d2f972a0877)

pseudofs: Allow vis callback to be called for a named node

2023-06-29T08:15:17Z

This will be used later in the linsysfs module to filter out VNETs. Reviewed by: des Differential revision: https://reviews.freebsd.org/D39382 MFC after: 1 month (cherry picked from commit 405c0c04edb6143405426da6a5273f4c5998d594)

pseudofs: Microoptimize struct pfs_node

2023-06-29T08:15:17Z

Since 81167243b the size of struct pfs_node is 280 bytes, so the kernel memory allocator takes memory from 384 bytes sized bucket. However, the length of the node name is mostly short, e.g., for Linux emulation layer it is up to 16 bytes. The size of struct pfs_node w/o pfs_name is 152 bytes, i.e., we have 104 bytes left to fit the node name into the 256 bytes-sized bucket. Reviewed by: des Differential revision: https://reviews.freebsd.org/D39381 MFC after: 1 month (cherry picked from commit 7f72324346ea154a92671fc913dbe82c0287501a)

sys/fs: do not report blocks allocated for synthetic file systems

2023-05-01T08:11:44Z

The pseudo file systems (devfs, fdescfs, procfs, etc.) report total and available blocks and inodes despite being synthetic with no underlying storage device to which those values could be applied. The current code of these file systems tends to report a fixed number of total blocks but no free blocks, and in the case of procfs, libprocfs, linsysfs also no free inodes. This can be irritating in e.g. the "df" output, since 100% of the resources seem to be in use, but it can also create warnings in monitoring tools used for capacity management. This patch makes these file systems return the same value for the total and free parameters, leading to 0% in use being displayed by "df". Since there is no resource that can be exhausted, this appears to be a sensible result. Reviewed by: mckusick Differential Revision: https://reviews.freebsd.org/D39442 (cherry picked from commit 88a795e80c03ff1d960d830ee273589664ab06cc)

pseudofs: Destroy vncache hashtbl on pseudofs module unload.

2022-06-17T19:33:41Z

Reviewed by: mjg, kib Differential Revision: https://reviews.freebsd.org/D31605 MFC after: 2 weeks (cherry picked from commit 0f74021fb6a5c3fb6e031892cc159b1e7e325bd6)

pseudofs: use vget_prep + vget_finish instead of vget + the interlock

2021-05-22T18:22:35Z

(cherry picked from commit 43999a5cba3cfbf0a0f6244c76a3cd548b6925e8)