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272461 |
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02-Oct-2014 |
gjb |
Copy stable/10@r272459 to releng/10.1 as part of the 10.1-RELEASE process.
Approved by: re (implicit) Sponsored by: The FreeBSD Foundation |
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256281 |
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10-Oct-2013 |
gjb |
Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.
Approved by: re (implicit) Sponsored by: The FreeBSD Foundation
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250505 |
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11-May-2013 |
kib |
- Fix nullfs vnode reference leak in nullfs_reclaim_lowervp(). The null_hashget() obtains the reference on the nullfs vnode, which must be dropped.
- Fix a wart which existed from the introduction of the nullfs caching, do not unlock lower vnode in the nullfs_reclaim_lowervp(). It should be innocent, but now it is also formally safe. Inform the nullfs_reclaim() about this using the NULLV_NOUNLOCK flag set on nullfs inode.
- Add a callback to the upper filesystems for the lower vnode unlinking. When inactivating a nullfs vnode, check if the lower vnode was unlinked, indicated by nullfs flag NULLV_DROP or VV_NOSYNC on the lower vnode, and reclaim upper vnode if so. This allows nullfs to purge cached vnodes for the unlinked lower vnode, avoiding excessive caching.
Reported by: G??ran L??wkrantz <goran.lowkrantz@ismobile.com> Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 2 weeks
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245004 |
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03-Jan-2013 |
kib |
Add the "nocache" nullfs mount option, which disables the caching of the free nullfs vnodes, switching nullfs behaviour to pre-r240285. The option is mostly intended as the last-resort when higher pressure on the vnode cache due to doubling of the vnode counts is not desirable.
Note that disabling the cache costs more than 2x wall time in the metadata-hungry scenarious. The default is "cache".
Tested and benchmarked by: pho (previous version) MFC after: 2 weeks
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240285 |
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09-Sep-2012 |
kib |
Allow shared lookups for nullfs mounts, if lower filesystem supports it. There are two problems which shall be addressed for shared lookups use to have measurable effect on nullfs scalability:
1. When vfs_lookup() calls VOP_LOOKUP() for nullfs, which passes lookup operation to lower fs, resulting vnode is often only shared-locked. Then null_nodeget() cannot instantiate covering vnode for lower vnode, since insmntque1() and null_hashins() require exclusive lock on the lower.
Change the assert that lower vnode is exclusively locked to only require any lock. If null hash failed to find pre-existing nullfs vnode for lower vnode and the vnode is shared-locked, the lower vnode lock is upgraded.
2. Nullfs reclaims its vnodes on deactivation. This is due to nullfs inability to detect reclamation of the lower vnode. Reclamation of a nullfs vnode at deactivation time prevents a reference to the lower vnode to become stale.
Change nullfs VOP_INACTIVE to not reclaim the vnode, instead use the VFS_RECLAIM_LOWERVP to get notification and reclaim upper vnode together with the reclamation of the lower vnode.
Note that nullfs reclamation procedure calls vput() on the lowervp vnode, temporary unlocking the vnode being reclaimed. This seems to be fine for MPSAFE filesystems, but not-MPSAFE code often put partially initialized vnode on some globally visible list, and later can decide that half-constructed vnode is not needed. If nullfs mount is created above such filesystem, then other threads might catch such not properly initialized vnode. Instead of trying to overcome this case, e.g. by recursing the lower vnode lock in null_reclaim_lowervp(), I decided to rely on nearby removal of the support for non-MPSAFE filesystems.
In collaboration with: pho MFC after: 3 weeks
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143642 |
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15-Mar-2005 |
jeff |
- Assume that all lower filesystems now support proper locking. Assert that they set v->v_vnlock. This is true for all filesystems in the tree. - Remove all uses of LK_THISLAYER. If the lower layer is locked, the null layer is locked. We only use vget() to get a reference now. null essentially does no locking. This fixes LOOKUP_SHARED with nullfs. - Remove the special LK_DRAIN considerations, I do not believe this is needed now as LK_DRAIN doesn't destroy the lower vnode's lock, and it's hardly used anymore. - Add one well commented hack to prevent the lowervp from going away while we're in it's VOP_LOCK routine. This can only happen if we're forcibly unmounted while some callers are waiting in the lock. In this case the lowervp could be recycled after we drop our last ref in null_reclaim(). Prevent this with a vhold().
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139776 |
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06-Jan-2005 |
imp |
/* -> /*- for copyright notices, minor format tweaks as necessary
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138290 |
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01-Dec-2004 |
phk |
Back when VOP_* was introduced, we did not have new-style struct initializations but we did have lofty goals and big ideals.
Adjust to more contemporary circumstances and gain type checking.
Replace the entire vop_t frobbing thing with properly typed structures. The only casualty is that we can not add a new VOP_ method with a loadable module. History has not given us reason to belive this would ever be feasible in the the first place.
Eliminate in toto VOCALL(), vop_t, VNODEOP_SET() etc.
Give coda correct prototypes and function definitions for all vop_()s.
Generate a bit more data from the vnode_if.src file: a struct vop_vector and protype typedefs for all vop methods.
Add a new vop_bypass() and make vop_default be a pointer to another struct vop_vector.
Remove a lot of vfs_init since vop_vector is ready to use from the compiler.
Cast various vop_mumble() to void * with uppercase name, for instance VOP_PANIC, VOP_NULL etc.
Implement VCALL() by making vdesc_offset the offsetof() the relevant function pointer in vop_vector. This is disgusting but since the code is generated by a script comparatively safe. The alternative for nullfs etc. would be much worse.
Fix up all vnode method vectors to remove casts so they become typesafe. (The bulk of this is generated by scripts)
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128019 |
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07-Apr-2004 |
imp |
Remove advertising clause from University of California Regent's license, per letter dated July 22, 1999 and email from Peter Wemm, Alan Cox and Robert Watson.
Approved by: core, peter, alc, rwatson
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116469 |
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17-Jun-2003 |
tjr |
MFp4: Fix two bugs causing possible deadlocks or panics, and one nit: - Emulate lock draining (LK_DRAIN) in null_lock() to avoid deadlocks when the vnode is being recycled. - Don't allow null_nodeget() to return a nullfs vnode from the wrong mount when multiple nullfs's are mounted. It's unclear why these checks were removed in null_subr.c 1.35, but they are definitely necessary. Without the checks, trying to unmount a nullfs mount will erroneously return EBUSY, and forcibly unmounting with -f will cause a panic. - Bump LOG2_SIZEVNODE up to 8, since vnodes are >256 bytes now. The old value (7) didn't cause any problems, but made the hash algorithm suboptimal.
These changes fix nullfs enough that a parallel buildworld succeeds.
Submitted by: tegge (partially; LK_DRAIN) Tested by: kris
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98183 |
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13-Jun-2002 |
semenu |
Fix a race during null node creation between relookuping the hash and adding vnode to hash. The fix is to use atomic hash-lookup-and-add-if- not-found operation. The odd thing is that this race can't happen actually because the lowervp vnode is locked exclusively now during the whole process of null node creation. This must be thought as a step toward shared lookups.
Also remove vp->v_mount checks when looking for a match in the hash, as this is the vestige.
Also add comments and cosmetic changes.
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98176 |
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13-Jun-2002 |
semenu |
Fix the "error" path (when dropping not fully initialized vnode). Also move hash operations out of null_vnops.c and explicitly initialize v_lock in null_node_alloc (to set wmesg).
Reviewed by: bp MFC after: 2 weeks
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97186 |
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23-May-2002 |
mux |
Convert nullfs to nmount.
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65467 |
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05-Sep-2000 |
bp |
Various cleanups towards make nullfs functional (it is still broken at this point):
Replace all '#ifdef DEBUG' with '#ifdef NULLFS_DEBUG' and add NULLFSDEBUG macro.
Protect nullfs hash table with lockmgr.
Use proper order of operations when freeing mnt_data.
Return correct fsid in the null_getattr().
Add null_open() function to catch MNT_NODEV (obtained from NetBSD).
Add null_rename() to catch cross-fs rename operations (submitted by Ustimenko Semen <semen@iclub.nsu.ru>)
Remove duplicate $FreeBSD$ tags.
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65464 |
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05-Sep-2000 |
bp |
Get rid from the __P() macros.
Encouraged by: peter
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#
60938 |
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26-May-2000 |
jake |
Back out the previous change to the queue(3) interface. It was not discussed and should probably not happen.
Requested by: msmith and others
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60833 |
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23-May-2000 |
jake |
Change the way that the queue(3) structures are declared; don't assume that the type argument to *_HEAD and *_ENTRY is a struct.
Suggested by: phk Reviewed by: phk Approved by: mdodd
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55206 |
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29-Dec-1999 |
peter |
Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL" is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
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50890 |
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04-Sep-1999 |
bde |
Get rid of the NULLFS_DIAGNOSTIC option. This option was as useful as the other XXXFS_DIAGNOSTIC options (not very) and mostly controlled tracing of normal operation. Use `#ifdef DEBUG' for non-diagnostics and `#ifdef DIAGNOSTIC' for diagnostics.
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50477 |
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27-Aug-1999 |
peter |
$Id$ -> $FreeBSD$
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29179 |
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07-Sep-1997 |
bde |
Some staticized variables were still declared to be extern.
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#
26111 |
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25-May-1997 |
peter |
Fix some warnings (missing prototypes, wrong "generic" args etc) umapfs uses one of nullfs's functions...
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22975 |
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22-Feb-1997 |
peter |
Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not ready for it yet.
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#
22597 |
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12-Feb-1997 |
mpp |
Make this compile again after the Lite2 merge. Also add missing function prototypes.
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#
22521 |
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10-Feb-1997 |
dyson |
This is the kernel Lite/2 commit. There are some requisite userland changes, so don't expect to be able to run the kernel as-is (very well) without the appropriate Lite/2 userland changes.
The system boots and can mount UFS filesystems.
Untested: ext2fs, msdosfs, NFS Known problems: Incorrect Berkeley ID strings in some files. Mount_std mounts will not work until the getfsent library routine is changed.
Reviewed by: various people Submitted by: Jeffery Hsu <hsu@freebsd.org>
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21673 |
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14-Jan-1997 |
jkh |
Make the long-awaited change from $Id$ to $FreeBSD$
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
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#
12158 |
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09-Nov-1995 |
bde |
Introduced a type `vop_t' for vnode operation functions and used it 1138 times (:-() in casts and a few more times in declarations. This change is null for the i386.
The type has to be `typedef int vop_t(void *)' and not `typedef int vop_t()' because `gcc -Wstrict-prototypes' warns about the latter. Since vnode op functions are called with args of different (struct pointer) types, neither of these function types is any use for type checking of the arg, so it would be preferable not to use the complete function type, especially since using the complete type requires adding 1138 casts to avoid compiler warnings and another 40+ casts to reverse the function pointer conversions before calling the functions.
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#
1541 |
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24-May-1994 |
rgrimes |
BSD 4.4 Lite Kernel Sources
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