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Change the kernel dev_t, representing a pointer to a specinfo structure, to cdev_t. Change struct specinfo to struct cdev. The name 'cdev' was taken from FreeBSD. Remove the dev_t shim for the kernel. This commit generally removes the overloading of 'dev_t' between userland and the kernel. Also fix a bug in libkvm where a kernel dev_t (now cdev_t) was not being properly converted to a userland dev_t.
Clone cd9660_blkatoff() into a new procedure, cd9660_devblkatoff(), which returns a devvp-relative buffer rather then the vp-relative buffer. This allows us to access meta-data relative to a vnode without having to instantiate a VM object for that vnode. The new function is used for all directory scans and (negative offset) meta-data access. This fixes a panic due to recent buffer cache commits that formalized the requirements for using the buffer cache. Also, prior to this change, the CD9660 filesystem was using B_MALLOC buffers for a great deal of meta-data access that could very easily have been backed by the device vnode's VM object instead. B_MALLOC buffers have severe caching limitations. This commit fixes all of that as well.
MFC 1.8 - Fix file sizes > 2GB on isofs
Fix file sizes > 2GB on isofs. This has already been fixed in the other BSDs. Submitted-by: Csaba Henk
Rename all the functions and structures for the old VOP namespace API functions from vop_* to vop_old_*. e.g. vop_lookup -> vop_old_lookup. This will make it easier to identify areas containing old VOP API code. Remove vop_old_*_ap() functions, they are not used (and not allowed to be used). The old API is only allowed at the leaf of a VFS stack.
VFS messaging/interfacing work stage 9/99: VFS 'NEW' API WORK. NOTE: unionfs and nullfs are temporarily broken by this commit. * Remove the old namecache API. Remove vfs_cache_lookup(), cache_lookup(), cache_enter(), namei() and lookup() are all gone. VOP_LOOKUP() and VOP_CACHEDLOOKUP() have been collapsed into a single non-caching VOP_LOOKUP(). * Complete the new VFS CACHE (namecache) API. The new API is able to supply topological guarentees and is able to reserve namespaces, including negative cache spaces (whether the target name exists or not), which the new API uses to reserve namespace for things like NRENAME and NCREATE (and others). * Complete the new namecache API. VOP_NRESOLVE, NLOOKUPDOTDOT, NCREATE, NMKDIR, NMKNOD, NLINK, NSYMLINK, NWHITEOUT, NRENAME, NRMDIR, NREMOVE. These new calls take (typicaly locked) namecache pointers rather then combinations of directory vnodes, file vnodes, and name components. The new calls are *MUCH* simpler in concept and implementation. For example, VOP_RENAME() has 8 arguments while VOP_NRENAME() has only 3 arguments. The new namecache API uses the namecache to lock namespaces without having to lock the underlying vnodes. For example, this allows the kernel to reserve the target name of a create function trivially. Namecache records are maintained BY THE KERNEL for both positive and negative hits. Generally speaking, the kernel layer is now responsible for resolving path elements. NRESOLVE is called when an unresolved namecache record needs to be resolved. Unlike the old VOP_LOOKUP, NRESOLVE is simply responsible for associating a vnode to a namecache record (positive hit) or telling the system that it's a negative hit, and not responsible for handling symlinks or other special cases or doing any of the other path lookup work, much unlike the old VOP_LOOKUP. It should be particularly noted that the new namecache topology does not allow disconnected namecache records. In rare cases where a vnode must be converted to a namecache pointer for new API operation via a file handle (i.e. NFS), the cache_fromdvp() function is provided and a new API VOP, VOP_NLOOKUPDOTDOT() is provided to allow the namecache to resolve the topology leading up to the requested vnode. These and other topological guarentees greatly reduce the complexity of the new namecache API. The new namei() is called nlookup(). This function uses a combination of cache_n*() calls, VOP_NRESOLVE(), and standard VOP calls resolve the supplied path, deal with symlinks, and so forth, in a nice small compact compartmentalized procedure. * The old VFS code is no longer responsible for maintaining namecache records, a function which was mostly adhoc cache_purge()s occuring before the VFS actually knows whether an operation will succeed or not. The new VFS code is typically responsible for adjusting the state of locked namecache records passed into it. For example, if NCREATE succeeds it must call cache_setvp() to associate the passed namecache record with the vnode representing the successfully created file. The new requirements are much less complex then the old requirements. * Most VFSs still implement the old API calls, albeit somewhat modified and in particular the VOP_LOOKUP function is now *MUCH* simpler. However, the kernel now uses the new API calls almost exclusively and relies on compatibility code installed in the default ops (vop_compat_*()) to convert the new calls to the old calls. * All kernel system calls and related support functions which used to do complex and confusing namei() operations now do far less complex and far less confusing nlookup() operations. * SPECOPS shortcutting has been implemented. User reads and writes now go directly to supporting functions which talk to the device via fileops rather then having to be routed through VOP_READ or VOP_WRITE, saving significant overhead. Note, however, that these only really effect /dev/null and /dev/zero. Implementing this was fairly easy, we now simply pass an optional struct file pointer to VOP_OPEN() and let spec_open() handle the override. SPECIAL NOTES: It should be noted that we must still lock a directory vnode LK_EXCLUSIVE before issuing a VOP_LOOKUP(), even for simple lookups, because a number of VFS's (including UFS) store active directory scanning information in the directory vnode. The legacy NAMEI_LOOKUP cases can be changed to use LK_SHARED once these VFS cases are fixed. In particular, we are now organized well enough to actually be able to do record locking within a directory for handling NCREATE, NDELETE, and NRENAME situations, but it hasn't been done yet. Many thanks to all of the testers and in particular David Rhodus for finding a large number of panics and other issues.
VFS messaging/interfacing work stage 4/99. This stage goes a long ways towards allowing us to move the vnode locking into a kernel layer. It gets rid of a lot of cruft from FreeBSD-4. FreeBSD-5 has done some of this stuff too (such as changing the default locking to stdlock from nolock), but DragonFly is going further. * Consolidate vnode locks into the vnode structure, add an embedded v_lock, and getting rid of both v_vnlock and v_data based head-of-structure locks. * Change the default vops to use a standard vnode lock rather then a fake non-lock. * Get rid of vop_nolock() and friends, we no longer support non-locking vnodes. * Get rid of vop_sharedlock(), we no longer support non standard shared-only locks (only NFS was using it and the mount-crossing lookup code should now prevent races to root from dead NFS volumes). * Integrate lock initialization into getnewvnode(). We do not yet incorporate automatically locking into getnewvnode(). getnewvnode() now has two additional arguments, lktimeout and lkflags, for lock structure initialization. * Change the sync vnode lock from nolock to stdlock. This may require more tuning down the line. Fix various sync_inactive() to properly unlock the lock as per the VOP API. * Properly flag the 'rename' vop operation regarding required tdvp and tvp unlocks (the flags are only used by nullfs). * Get rid of all inode-embedded vnode locks * Remove manual lockinit and use new getnewvnode() args instead. Lock the vnode prior to doing anything that might block in order to avoid synclist access before the vnode has been properly initialize. * Generally change inode hash insertion to also check for a hash collision and return failure if it occurs, rather then doing (often non-atomic) relookups and other checks. These sorts of collisions can occur if a vnode is being destroyed at the same time a new vnode is being created from an inode. A new vnode is not generally accessible, except by the sync code (from the mountlist) until it's underlying inode has been hashed so dealing with a hash collision should be as simple as throwing away the vnode with a vput(). * Do not initialize a new vnode's v_data until after the associated inode has been successfully added to the hash, and make the xxx_inactive() and xxx_reclaim() code friendly towards vnodes with a NULL v_data. * NFS now uses standard locks rather then shared-only locks. * PROCFS now uses standard locks rather then non-locks, and PROCFS's lookup code now understands VOP lookup semantics. PROCFS now uses a real hash table for its node search rather then a single singly-linked list (which should better scale to systems with thousands of processes). * NULLFS should now properly handle lookup() and rename() locks. NULLFS's node handling code has been rewritten. NULLFS's bypass code now understands vnode unlocks (rename case). * UFS no longer needs the ffs_inode_hash_lock hacks. It now uses the new collision-on-hash-add methodology. This will speed up UFS when operating on lots of small files (reported by David Rhodus).
POSIX lock resource limit part 3/4 This splits "struct lockf" into the general book-keeping of ranges and blocked request and the "struct lockf_range" which constists of the data for a specific range. Adjust the interface of lf_advlock to remove one level of pointer indirection and embedded "struct lockf" directly in the inodes. Don't mess with wait channels any more. Change the algorithm for determing locks to a more direct approach, which both simplifies the lock acquisition and proper book-keeping of the number of ranges currently used. The later is necessary to prevent local resource exhaustion. The code is not fully malloc block-safe, but as good or bad as the old code. Add the kernel part of the posixlocks rlimit. This is the maximum number of POSIX lock ranges any user can acquire. These numbers are tracked for each user and process and checked at lock/unlock time. If a process changes uid, its locks are transfered to the new uid which can effectivly boost that number above the limit. This is based on the patch set from Devon H. O'Dell <firstname.lastname@example.org> for the general infrastructure with some adjustment to better integrate with the new lockf code.
__P()!=wanted, remove old style prototypes from the vfs subtree
Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most ids have been removed from !lint sections and moved into comment sections.
import from FreeBSD RELENG_4 1.20