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

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

2023-08-23T17:43:22Z

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/ Similar commit in current: (cherry picked from commit 2ff63af9b88c)

vn_open(): If the vnode is reclaimed during open(2), do not return error.

2021-02-24T07:42:42Z

(cherry picked from commit ee965dfa64929227ced8adb68900c35f877480e7)

cache: add symlink support to lockless lookup

2021-02-01T12:37:46Z

Reviewed by: kib (previous version) Tested by: pho (previous version) Differential Revision: https://reviews.freebsd.org/D27488

cache: fix vexec panic when racing against vgone

2020-10-09T19:10:00Z

Use of dead_vnodeops would result in a panic instead of returning the intended EOPNOTSUPP error. While here make sure to abort, not just try to return a partial result. The former allows the regular lookup to restart from scratch, while the latter makes it stuck with an unusable vnode. Reported by: kevans

vfs: flatten vop vectors

2019-12-16T00:06:22Z

This eliminates the following loop from all VOP calls: while(vop != NULL && \ vop->vop_spare2 == NULL && vop->vop_bypass == NULL) vop = vop->vop_default; Reviewed by: jeff Tesetd by: pho Differential Revision: https://reviews.freebsd.org/D22738

Switch to use shared vnode locks for text files during image activation.

2019-05-05T11:20:43Z

kern_execve() locks text vnode exclusive to be able to set and clear VV_TEXT flag. VV_TEXT is mutually exclusive with the v_writecount > 0 condition. The change removes VV_TEXT, replacing it with the condition v_writecount <= -1, and puts v_writecount under the vnode interlock. Each text reference decrements v_writecount. To clear the text reference when the segment is unmapped, it is recorded in the vm_map_entry backed by the text file as MAP_ENTRY_VN_TEXT flag, and v_writecount is incremented on the map entry removal The operations like VOP_ADD_WRITECOUNT() and VOP_SET_TEXT() check that v_writecount does not contradict the desired change. vn_writecheck() is now racy and its use was eliminated everywhere except access. Atomic check for writeability and increment of v_writecount is performed by the VOP. vn_truncate() now increments v_writecount around VOP_SETATTR() call, lack of which is arguably a bug on its own. nullfs bypasses v_writecount to the lower vnode always, so nullfs vnode has its own v_writecount correct, and lower vnode gets all references, since object->handle is always lower vnode. On the text vnode' vm object dealloc, the v_writecount value is reset to zero, and deadfs vop_unset_text short-circuit the operation. Reclamation of lowervp always reclaims all nullfs vnodes referencing lowervp first, so no stray references are left. Reviewed by: markj, trasz Tested by: mjg, pho Sponsored by: The FreeBSD Foundation MFC after: 1 month Differential revision: https://reviews.freebsd.org/D19923

sys: further adoption of SPDX licensing ID tags.

2017-11-20T19:43:44Z

Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.

Renumber copyright clause 4

2017-02-28T23:42:47Z

Renumber cluase 4 to 3, per what everybody else did when BSD granted them permission to remove clause 3. My insistance on keeping the same numbering for legal reasons is too pedantic, so give up on that point. Submitted by: Jan Schaumann Pull Request: https://github.com/freebsd/freebsd/pull/96

Style changes for deadfs:

2014-10-15T13:22:33Z

- ANSIfy VOPs. - Remove trivial comments. - Remove ARGSUSED. - Remove copies of the vop_XXX_args structure definitions in comments. Sponsored by: The FreeBSD Foundation MFC after: 1 week

When vnode bypass cannot be performed on the cdev file descriptor for

2014-10-15T13:16:51Z

read/write/poll/ioctl, call standard vnode filedescriptor fop. This restores the special handling for terminals by calling the deadfs VOP, instead of always returning ENXIO for destroyed devices or revoked terminals. Since destroyed (and not revoked) device would use devfs_specops VOP vector, make dead_read/write/poll non-static and fill VOP table with pointers to the functions, to instead of VOP_PANIC. Noted and reviewed by: bde Sponsored by: The FreeBSD Foundation MFC after: 1 week