sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

sys: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

show more ...

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

Remove /^\s*\*+\s*\$FreeBSD\$.*$\n/

deadfs: consistently return EOPNOTSUPP for fplookup vops

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

Most future operations on the returned file descriptor will fail
anyway, and application should be ready to handle that fail

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

Most future operations on the returned file descriptor will fail
anyway, and application should be ready to handle that failures. Not
forcing it to understand the transient failure mode on open, which is
implementation-specific, should make us less special without loss of
reporting of errors.

Suggested by: chs
Reviewed by: chs, mckusick
Tested by: pho
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation

show more ...

cache: add symlink support to lockless lookup

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

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 retu

cache: fix vexec panic when racing against vgone

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

show more ...

vfs: flatten vop vectors

This eliminates the following loop from all VOP calls:

while(vop != NULL && \
vop->vop_spare2 == NULL && vop->vop_bypass == NULL)
vop = vop->vop_default;

Revie

vfs: flatten vop vectors

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

show more ...

MFHead @347527

Sponsored by: The FreeBSD Foundation

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

kern_execve() locks text vnode exclusive to be able to set and clear
VV_TEXT flag. VV_TEXT is mutually exclusive with the v_w

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

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

show more ...

Merge ^/head r325999 through r326131.

sys: further adoption of SPDX licensing ID tags.

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

sys: further adoption of SPDX licensing ID tags.

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.

show more ...

Merge ^/head r314420 through r314481.

Renumber copyright clause 4

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

Renumber copyright clause 4

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 <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

show more ...

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Merge from head@274682

Sync to HEAD@r274095.

IFC @r273206

Style changes for deadfs:
- ANSIfy VOPs.
- Remove trivial comments.
- Remove ARGSUSED.
- Remove copies of the vop_XXX_args structure definitions in comments.

Sponsored by: The FreeBSD Foundation
MFC

Style changes for deadfs:
- 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

show more ...

When vnode bypass cannot be performed on the cdev file descriptor for
read/write/poll/ioctl, call standard vnode filedescriptor fop. This
restores the special handling for terminals by calling the d

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

show more ...

Change the deadfs poll VOP to return POLLIN|POLLRDNORM if the caller
is interested in i/o state. Return POLLNVAL for invalid bits, similar
to poll_no_poll(). Note that POLLOUT must not be returned,

Change the deadfs poll VOP to return POLLIN|POLLRDNORM if the caller
is interested in i/o state. Return POLLNVAL for invalid bits, similar
to poll_no_poll(). Note that POLLOUT must not be returned, since
POLLHUP is set.

Noted and reviewed by: bde
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

show more ...

Merge fresh head.

MFC @ r241285

IFC @ r242684

Sync from head

The deadfs VOPs for vop_ioctl and vop_bmap call itself recursively,
which is an elaborate way to cause kernel panic. Change the VOPs
implementation to return EBADF for a reclaimed vnode.

While the c

The deadfs VOPs for vop_ioctl and vop_bmap call itself recursively,
which is an elaborate way to cause kernel panic. Change the VOPs
implementation to return EBADF for a reclaimed vnode.

While the calls to vop_bmap should not reach deadfs, it is indeed
possible for vop_ioctl, because the VOP locking protocol is to pass
the vnode to VOP unlocked. The actual panic was observed when ioctl
was called on procfs filedescriptor which pointed to an exited
process.

Reported by: zont
Tested by: pho
MFC after: 1 week

show more ...