* License. For details, see the LICENSE file in the top-level source
* directory or online at http://www.openafs.org/dl/license10.html
*
- * Portions Copyright (c) 2006 Sine Nomine Associates
+ * Portions Copyright (c) 2005-2008 Sine Nomine Associates
*/
/*
#include <errno.h>
#include <stdio.h>
#include <string.h>
+#include <stdarg.h>
#ifdef AFS_PTHREAD_ENV
#include <assert.h>
#else /* AFS_PTHREAD_ENV */
#endif /* AFS_PTHREAD_ENV */
#include <rx/xdr.h>
+#include "rx/rx_queue.h"
#include <afs/afsint.h>
#include "nfs.h"
#include <afs/errors.h>
#include "ihandle.h"
#include "vnode.h"
#include "volume.h"
+#include "volume_inline.h"
+#include "vnode_inline.h"
#include "partition.h"
#include "salvsync.h"
#if defined(AFS_SGI_ENV)
struct VnodeClassInfo VnodeClassInfo[nVNODECLASSES];
-private int moveHash(register Vnode * vnp, bit32 newHash);
-private void StickOnLruChain_r(register Vnode * vnp,
- register struct VnodeClassInfo *vcp);
+void VNLog(afs_int32 aop, afs_int32 anparms, ... );
extern int LogLevel;
+
+
+
#define BAD_IGET -1000
/* There are two separate vnode queue types defined here:
static afs_int32 theLog[THELOGSIZE];
static afs_int32 vnLogPtr = 0;
void
-VNLog(aop, anparms, av1, av2, av3, av4)
- afs_int32 aop, anparms;
- afs_int32 av1, av2, av3, av4;
+VNLog(afs_int32 aop, afs_int32 anparms, ... )
{
register afs_int32 temp;
- afs_int32 data[4];
+ va_list ap;
+
+ va_start(ap, anparms);
- /* copy data to array */
- data[0] = av1;
- data[1] = av2;
- data[2] = av3;
- data[3] = av4;
if (anparms > 4)
anparms = 4; /* do bounds checking */
if (vnLogPtr >= THELOGSIZE)
vnLogPtr = 0;
for (temp = 0; temp < anparms; temp++) {
- theLog[vnLogPtr++] = data[temp];
+ theLog[vnLogPtr++] = va_arg(ap, afs_int32);
if (vnLogPtr >= THELOGSIZE)
vnLogPtr = 0;
}
+ va_end(ap);
}
/* VolumeHashOffset -- returns a new value to be stored in the
#define VNODE_HASH(volumeptr,vnodenumber)\
((volumeptr->vnodeHashOffset + vnodenumber)&(VNODE_HASH_TABLE_SIZE-1))
-/*
- * new support to secondarily hash vnodes by volume id
- */
-#define VNVOLUME_HASH(volumeId) (volumeId&(VolumeHashTable.Mask))
-
-#include "rx/rx_queue.h"
-typedef struct VnodeHashByVolumeChainHead {
- struct rx_queue queue;
- int len;
- /* someday we could put a per-chain lock here... */
-#ifdef AFS_DEMAND_ATTACH_FS
- int busy;
- pthread_cond_t chain_busy_cv;
-#endif /* AFS_DEMAND_ATTACH_FS */
-} VnodeHashByVolumeChainHead;
-private VnodeHashByVolumeChainHead *VnodeHashByVolumeTable = NULL;
+/**
+ * add a vnode to the volume's vnode list.
+ *
+ * @param[in] vp volume object pointer
+ * @param[in] vnp vnode object pointer
+ *
+ * @note for DAFS, it may seem like we should be acquiring a lightweight ref
+ * on vp, but this would actually break things. Right now, this is ok
+ * because we destroy all vnode cache contents during during volume
+ * detach.
+ *
+ * @pre VOL_LOCK held
+ *
+ * @internal volume package internal use only
+ */
void
-VInitVnHashByVolume(void)
+AddToVVnList(Volume * vp, Vnode * vnp)
{
- register int i;
+ if (queue_IsOnQueue(vnp))
+ return;
- VnodeHashByVolumeTable = (VnodeHashByVolumeChainHead *) calloc(VolumeHashTable.Size,
- sizeof(VnodeHashByVolumeChainHead));
- assert(VnodeHashByVolumeTable != NULL);
-
- for (i=0; i < VolumeHashTable.Size; i++) {
- queue_Init(&VnodeHashByVolumeTable[i]);
-#ifdef AFS_DEMAND_ATTACH_FS
- assert(pthread_cond_init(&VnodeHashByVolumeTable[i].chain_busy_cv, NULL) == 0);
-#endif /* AFS_DEMAND_ATTACH_FS */
- }
+ Vn_volume(vnp) = vp;
+ Vn_cacheCheck(vnp) = vp->cacheCheck;
+ queue_Append(&vp->vnode_list, vnp);
+ Vn_stateFlags(vnp) |= VN_ON_VVN;
}
-static void
-AddToVnHashByVolumeTable(register Vnode * vnp)
+/**
+ * delete a vnode from the volume's vnode list.
+ *
+ * @pre VOL_LOCK held
+ *
+ * @internal volume package internal use only
+ */
+void
+DeleteFromVVnList(register Vnode * vnp)
{
- VnodeHashByVolumeChainHead * head;
+ Vn_volume(vnp) = NULL;
- if (queue_IsOnQueue(vnp))
+ if (!queue_IsOnQueue(vnp))
return;
- head = &VnodeHashByVolumeTable[VNVOLUME_HASH(vnp->volumePtr->hashid)];
+ queue_Remove(vnp);
+ Vn_stateFlags(vnp) &= ~(VN_ON_VVN);
+}
-#ifdef AFS_DEMAND_ATTACH_FS
- while (head->busy) {
- /* if the hash table is busy, wait */
- assert(pthread_cond_wait(&head->chain_busy_cv, &vol_glock_mutex) == 0);
+/**
+ * add a vnode to the end of the lru.
+ *
+ * @param[in] vcp vnode class info object pointer
+ * @param[in] vnp vnode object pointer
+ *
+ * @internal vnode package internal use only
+ */
+void
+AddToVnLRU(struct VnodeClassInfo * vcp, Vnode * vnp)
+{
+ if (Vn_stateFlags(vnp) & VN_ON_LRU) {
+ return;
}
-#endif /* AFS_DEMAND_ATTACH_FS */
- head->len++;
- queue_Append(head, vnp);
+ /* Add it to the circular LRU list */
+ if (vcp->lruHead == NULL)
+ Abort("VPutVnode: vcp->lruHead==NULL");
+ else {
+ vnp->lruNext = vcp->lruHead;
+ vnp->lruPrev = vcp->lruHead->lruPrev;
+ vcp->lruHead->lruPrev = vnp;
+ vnp->lruPrev->lruNext = vnp;
+ vcp->lruHead = vnp;
+ }
+
+ /* If the vnode was just deleted, put it at the end of the chain so it
+ * will be reused immediately */
+ if (vnp->delete)
+ vcp->lruHead = vnp->lruNext;
+
+ Vn_stateFlags(vnp) |= VN_ON_LRU;
}
-/* for demand-attach, caller MUST hold a ref count on vp */
-static void
-DeleteFromVnHashByVolumeTable(register Vnode * vnp)
+/**
+ * delete a vnode from the lru.
+ *
+ * @param[in] vcp vnode class info object pointer
+ * @param[in] vnp vnode object pointer
+ *
+ * @internal vnode package internal use only
+ */
+void
+DeleteFromVnLRU(struct VnodeClassInfo * vcp, Vnode * vnp)
{
- VnodeHashByVolumeChainHead * head;
-
- if (!queue_IsOnQueue(vnp))
+ if (!(Vn_stateFlags(vnp) & VN_ON_LRU)) {
return;
+ }
- head = &VnodeHashByVolumeTable[VNVOLUME_HASH(vnp->volumePtr->hashid)];
+ if (vnp == vcp->lruHead)
+ vcp->lruHead = vcp->lruHead->lruNext;
-#ifdef AFS_DEMAND_ATTACH_FS
- while (head->busy) {
- /* if the hash table is busy, wait */
- assert(pthread_cond_wait(&head->chain_busy_cv, &vol_glock_mutex) == 0);
+ if ((vnp == vcp->lruHead) ||
+ (vcp->lruHead == NULL))
+ Abort("DeleteFromVnLRU: lru chain addled!\n");
+
+ vnp->lruPrev->lruNext = vnp->lruNext;
+ vnp->lruNext->lruPrev = vnp->lruPrev;
+
+ Vn_stateFlags(vnp) &= ~(VN_ON_LRU);
+}
+
+/**
+ * add a vnode to the vnode hash table.
+ *
+ * @param[in] vnp vnode object pointer
+ *
+ * @pre VOL_LOCK held
+ *
+ * @post vnode on hash
+ *
+ * @internal vnode package internal use only
+ */
+void
+AddToVnHash(Vnode * vnp)
+{
+ unsigned int newHash;
+
+ if (!(Vn_stateFlags(vnp) & VN_ON_HASH)) {
+ newHash = VNODE_HASH(Vn_volume(vnp), Vn_id(vnp));
+ vnp->hashNext = VnodeHashTable[newHash];
+ VnodeHashTable[newHash] = vnp;
+ vnp->hashIndex = newHash;
+
+ Vn_stateFlags(vnp) |= VN_ON_HASH;
}
-#endif /* AFS_DEMAND_ATTACH_FS */
+}
- head->len--;
- queue_Remove(vnp);
+/**
+ * delete a vnode from the vnode hash table.
+ *
+ * @param[in] vnp
+ * @param[in] hash
+ *
+ * @pre VOL_LOCK held
+ *
+ * @post vnode removed from hash
+ *
+ * @internal vnode package internal use only
+ */
+void
+DeleteFromVnHash(Vnode * vnp)
+{
+ Vnode * tvnp;
+
+ if (Vn_stateFlags(vnp) & VN_ON_HASH) {
+ tvnp = VnodeHashTable[vnp->hashIndex];
+ if (tvnp == vnp)
+ VnodeHashTable[vnp->hashIndex] = vnp->hashNext;
+ else {
+ while (tvnp && tvnp->hashNext != vnp)
+ tvnp = tvnp->hashNext;
+ if (tvnp)
+ tvnp->hashNext = vnp->hashNext;
+ }
+
+ vnp->hashNext = NULL;
+ vnp->hashIndex = 0;
+ Vn_stateFlags(vnp) &= ~(VN_ON_HASH);
+ }
}
-/* Code to invalidate a vnode entry. Called when we've damaged a vnode, and want
- to prevent future VGetVnode's from applying to it. Leaves it in the same hash bucket
- but that shouldn't be important. */
+
+/**
+ * invalidate a vnode cache entry.
+ *
+ * @param[in] avnode vnode object pointer
+ *
+ * @pre VOL_LOCK held
+ *
+ * @post vnode metadata invalidated.
+ * vnode removed from hash table.
+ * DAFS: vnode state set to VN_STATE_INVALID.
+ *
+ * @internal vnode package internal use only
+ */
void
VInvalidateVnode_r(register struct Vnode *avnode)
{
avnode->changed_newTime = 0; /* don't let it get flushed out again */
avnode->changed_oldTime = 0;
- avnode->delete = 0; /* it isn't deleted, erally */
+ avnode->delete = 0; /* it isn't deleted, really */
avnode->cacheCheck = 0; /* invalid: prevents future vnode searches from working */
+ DeleteFromVnHash(avnode);
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(avnode, VN_STATE_INVALID);
+#endif
}
-/* Not normally called by general client; called by volume.c */
+
+/**
+ * initialize vnode cache for a given vnode class.
+ *
+ * @param[in] class vnode class
+ * @param[in] nVnodes size of cache
+ *
+ * @post vnode cache allocated and initialized
+ *
+ * @internal volume package internal use only
+ *
+ * @note generally called by VInitVolumePackage_r
+ *
+ * @see VInitVolumePackage_r
+ */
int
VInitVnodes(VnodeClass class, int nVnodes)
{
assert(va != NULL);
while (nVnodes--) {
Vnode *vnp = (Vnode *) va;
- vnp->nUsers = 0; /* no context switches */
+ Vn_refcount(vnp) = 0; /* no context switches */
+ Vn_stateFlags(vnp) |= VN_ON_LRU;
+#ifdef AFS_DEMAND_ATTACH_FS
+ assert(pthread_cond_init(&Vn_stateCV(vnp), NULL) == 0);
+ Vn_state(vnp) = VN_STATE_INVALID;
+ Vn_readers(vnp) = 0;
+#else /* !AFS_DEMAND_ATTACH_FS */
Lock_Init(&vnp->lock);
+#endif /* !AFS_DEMAND_ATTACH_FS */
vnp->changed_oldTime = 0;
vnp->changed_newTime = 0;
- vnp->volumePtr = NULL;
- vnp->cacheCheck = 0;
- vnp->delete = vnp->vnodeNumber = 0;
+ Vn_volume(vnp) = NULL;
+ Vn_cacheCheck(vnp) = 0;
+ vnp->delete = Vn_id(vnp) = 0;
#ifdef AFS_PTHREAD_ENV
vnp->writer = (pthread_t) 0;
#else /* AFS_PTHREAD_ENV */
#endif /* AFS_PTHREAD_ENV */
vnp->hashIndex = 0;
vnp->handle = NULL;
+ Vn_class(vnp) = vcp;
if (vcp->lruHead == NULL)
vcp->lruHead = vnp->lruNext = vnp->lruPrev = vnp;
else {
}
-/* allocate an *unused* vnode from the LRU chain, going backwards of course. It shouldn't
- be necessary to specify that nUsers == 0 since if it is in the list, nUsers
- should be 0. Things shouldn't be in lruq unless no one is using them. */
+/**
+ * allocate an unused vnode from the lru chain.
+ *
+ * @param[in] vcp vnode class info object pointer
+ *
+ * @pre VOL_LOCK is held
+ *
+ * @post vnode object is removed from lru, and vnode hash table.
+ * vnode is disassociated from volume object.
+ * state is set to VN_STATE_INVALID.
+ * inode handle is released.
+ *
+ * @note we traverse backwards along the lru circlist. It shouldn't
+ * be necessary to specify that nUsers == 0 since if it is in the list,
+ * nUsers should be 0. Things shouldn't be in lruq unless no one is
+ * using them.
+ *
+ * @warning DAFS: VOL_LOCK is dropped while doing inode handle release
+ *
+ * @return vnode object pointer
+ */
Vnode *
VGetFreeVnode_r(struct VnodeClassInfo * vcp)
{
register Vnode *vnp;
vnp = vcp->lruHead->lruPrev;
- if (vnp->nUsers != 0 || CheckLock(&vnp->lock))
- Abort("locked vnode in lruq");
- VNLog(1, 2, vnp->vnodeNumber, (afs_int32) vnp);
- IH_RELEASE(vnp->handle);
+#ifdef AFS_DEMAND_ATTACH_FS
+ if (Vn_refcount(vnp) != 0 || VnIsExclusiveState(Vn_state(vnp)) ||
+ Vn_readers(vnp) != 0)
+ Abort("VGetFreeVnode_r: in-use vnode in lruq");
+#else
+ if (Vn_refcount(vnp) != 0 || CheckLock(&vnp->lock))
+ Abort("VGetFreeVnode_r: locked vnode in lruq");
+#endif
+ VNLog(1, 2, Vn_id(vnp), (afs_int32) vnp, 0, 0);
+
+ /*
+ * it's going to be overwritten soon enough.
+ * remove from LRU, delete hash entry, and
+ * disassociate from old parent volume before
+ * we have a chance to drop the vol glock
+ */
+ DeleteFromVnLRU(vcp, vnp);
+ DeleteFromVnHash(vnp);
+ if (Vn_volume(vnp)) {
+ DeleteFromVVnList(vnp);
+ }
+
+ /* drop the file descriptor */
+ if (vnp->handle) {
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_RELEASING);
+ VOL_UNLOCK;
+#endif
+ /* release is, potentially, a highly latent operation due to a couple
+ * factors:
+ * - ihandle package lock contention
+ * - closing file descriptor(s) associated with ih
+ *
+ * Hance, we perform outside of the volume package lock in order to
+ * reduce the probability of contention.
+ */
+ IH_RELEASE(vnp->handle);
+#ifdef AFS_DEMAND_ATTACH_FS
+ VOL_LOCK;
+#endif
+ }
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_INVALID);
+#endif
+
+ return vnp;
+}
+
+
+/**
+ * lookup a vnode in the vnode cache hash table.
+ *
+ * @param[in] vp pointer to volume object
+ * @param[in] vnodeId vnode id
+ *
+ * @pre VOL_LOCK held
+ *
+ * @post matching vnode object or NULL is returned
+ *
+ * @return vnode object pointer
+ * @retval NULL no matching vnode object was found in the cache
+ *
+ * @internal vnode package internal use only
+ *
+ * @note this symbol is exported strictly for fssync debug protocol use
+ */
+Vnode *
+VLookupVnode(Volume * vp, VnodeId vnodeId)
+{
+ Vnode * vnp;
+ unsigned int newHash;
+
+ newHash = VNODE_HASH(vp, vnodeId);
+ for (vnp = VnodeHashTable[newHash];
+ (vnp &&
+ ((Vn_id(vnp) != vnodeId) ||
+ (Vn_volume(vnp) != vp) ||
+ (vp->cacheCheck != Vn_cacheCheck(vnp))));
+ vnp = vnp->hashNext);
+
return vnp;
}
-static mlkReason = 0;
-static mlkLastAlloc = 0;
-static mlkLastOver = 0;
-static mlkLastDelete = 0;
Vnode *
VAllocVnode(Error * ec, Volume * vp, VnodeType type)
return retVal;
}
+/**
+ * allocate a new vnode.
+ *
+ * @param[out] ec error code return
+ * @param[in] vp volume object pointer
+ * @param[in] type desired vnode type
+ *
+ * @return vnode object pointer
+ *
+ * @pre VOL_LOCK held;
+ * heavyweight ref held on vp
+ *
+ * @post vnode allocated and returned
+ */
Vnode *
VAllocVnode_r(Error * ec, Volume * vp, VnodeType type)
{
register Vnode *vnp;
VnodeId vnodeNumber;
- int newHash, bitNumber;
+ int bitNumber;
register struct VnodeClassInfo *vcp;
VnodeClass class;
Unique unique;
+#ifdef AFS_DEMAND_ATTACH_FS
+ VolState vol_state_save;
+#endif
*ec = 0;
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ /*
+ * once a volume has entered an error state, don't permit
+ * further operations to proceed
+ * -- tkeiser 11/21/2007
+ */
+ VWaitExclusiveState_r(vp);
+ if (VIsErrorState(V_attachState(vp))) {
+ /* XXX is VSALVAGING acceptable here? */
+ *ec = DAFS_VSALVAGE;
+ return NULL;
+ }
+#endif
+
if (programType == fileServer && !V_inUse(vp)) {
if (vp->specialStatus) {
*ec = vp->specialStatus;
unique = vp->nextVnodeUnique++;
if (vp->nextVnodeUnique > V_uniquifier(vp)) {
- VUpdateVolume_r(ec, vp, VOL_UPDATE_WAIT);
+ VUpdateVolume_r(ec, vp, 0);
if (*ec)
return NULL;
}
return NULL;
vnodeNumber = bitNumberToVnodeNumber(bitNumber, class);
+ /*
+ * DAFS:
+ * at this point we should be assured that V_attachState(vp) is non-exclusive
+ */
+
vnrehash:
- VNLog(2, 1, vnodeNumber);
+ VNLog(2, 1, vnodeNumber, 0, 0, 0);
/* Prepare to move it to the new hash chain */
- newHash = VNODE_HASH(vp, vnodeNumber);
- for (vnp = VnodeHashTable[newHash];
- vnp && (vnp->vnodeNumber != vnodeNumber || vnp->volumePtr != vp
- || vnp->volumePtr->cacheCheck != vnp->cacheCheck);
- vnp = vnp->hashNext);
+ vnp = VLookupVnode(vp, vnodeNumber);
if (vnp) {
/* slot already exists. May even not be in lruq (consider store file locking a file being deleted)
* so we may have to wait for it below */
- VNLog(3, 2, vnodeNumber, (afs_int32) vnp);
-
- /* If first user, remove it from the LRU chain. We can assume that
- * there is at least one item in the queue */
- if (++vnp->nUsers == 1) {
- if (vnp == vcp->lruHead)
- vcp->lruHead = vcp->lruHead->lruNext;
- vnp->lruPrev->lruNext = vnp->lruNext;
- vnp->lruNext->lruPrev = vnp->lruPrev;
- if (vnp == vcp->lruHead || vcp->lruHead == NULL)
- Abort("VGetVnode: lru chain addled!\n");
+ VNLog(3, 2, vnodeNumber, (afs_int32) vnp, 0, 0);
+
+ VnCreateReservation_r(vnp);
+ if (Vn_refcount(vnp) == 1) {
+ /* we're the only user */
/* This won't block */
- ObtainWriteLock(&vnp->lock);
+ VnLock(vnp, WRITE_LOCK, VOL_LOCK_HELD, WILL_NOT_DEADLOCK);
} else {
- /* follow locking hierarchy */
- VOL_UNLOCK;
- ObtainWriteLock(&vnp->lock);
- VOL_LOCK;
- if (vnp->volumePtr->cacheCheck != vnp->cacheCheck) {
- ReleaseWriteLock(&vnp->lock);
+ /* other users present; follow locking hierarchy */
+ VnLock(vnp, WRITE_LOCK, VOL_LOCK_HELD, MIGHT_DEADLOCK);
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ /*
+ * DAFS:
+ * vnode was cached, wait for any existing exclusive ops to finish.
+ * once we have reacquired the lock, re-verify volume state.
+ *
+ * note: any vnode error state is related to the old vnode; disregard.
+ */
+ VnWaitQuiescent_r(vnp);
+ if (VIsErrorState(V_attachState(vp))) {
+ VnUnlock(vnp, WRITE_LOCK);
+ VnCancelReservation_r(vnp);
+ *ec = DAFS_VSALVAGE;
+ return NULL;
+ }
+#endif
+
+ /*
+ * verify state of the world hasn't changed
+ *
+ * (technically, this should never happen because cachecheck
+ * is only updated during a volume attach, which should not
+ * happen when refs are held)
+ */
+ if (Vn_volume(vnp)->cacheCheck != Vn_cacheCheck(vnp)) {
+ VnUnlock(vnp, WRITE_LOCK);
+ VnCancelReservation_r(vnp);
goto vnrehash;
}
}
-#ifdef AFS_PTHREAD_ENV
- vnp->writer = pthread_self();
-#else /* AFS_PTHREAD_ENV */
- LWP_CurrentProcess(&vnp->writer);
-#endif /* AFS_PTHREAD_ENV */
+
} else {
+ /* no such vnode in the cache */
+
vnp = VGetFreeVnode_r(vcp);
- /* Remove vnode from LRU chain and grab a write lock */
- if (vnp == vcp->lruHead)
- vcp->lruHead = vcp->lruHead->lruNext;
- vnp->lruPrev->lruNext = vnp->lruNext;
- vnp->lruNext->lruPrev = vnp->lruPrev;
- if (vnp == vcp->lruHead || vcp->lruHead == NULL)
- Abort("VGetVnode: lru chain addled!\n");
+
/* Initialize the header fields so noone allocates another
* vnode with the same number */
- vnp->vnodeNumber = vnodeNumber;
- vnp->volumePtr = vp;
- vnp->cacheCheck = vp->cacheCheck;
- vnp->nUsers = 1;
- /* This will never block */
- ObtainWriteLock(&vnp->lock);
-#ifdef AFS_PTHREAD_ENV
- vnp->writer = pthread_self();
-#else /* AFS_PTHREAD_ENV */
- LWP_CurrentProcess(&vnp->writer);
-#endif /* AFS_PTHREAD_ENV */
+ Vn_id(vnp) = vnodeNumber;
+ VnCreateReservation_r(vnp);
+ AddToVVnList(vp, vnp);
+#ifdef AFS_DEMAND_ATTACH_FS
+ AddToVnHash(vnp);
+#endif
+
+ /* This will never block (guaranteed by check in VGetFreeVnode_r() */
+ VnLock(vnp, WRITE_LOCK, VOL_LOCK_HELD, WILL_NOT_DEADLOCK);
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_ALLOC);
+#endif
+
/* Sanity check: is this vnode really not in use? */
{
int size;
/* XXX we have a potential race here if two threads
* allocate new vnodes at the same time, and they
* both decide it's time to extend the index
- * file size... */
+ * file size...
+ */
+#ifdef AFS_DEMAND_ATTACH_FS
+ /*
+ * this race has been eliminated for the DAFS case
+ * using exclusive state VOL_STATE_VNODE_ALLOC
+ *
+ * if this becomes a bottleneck, there are ways to
+ * improve parallelism for this code path
+ * -- tkeiser 11/28/2007
+ */
+ VCreateReservation_r(vp);
+ VWaitExclusiveState_r(vp);
+ vol_state_save = VChangeState_r(vp, VOL_STATE_VNODE_ALLOC);
+#endif
VOL_UNLOCK;
fdP = IH_OPEN(ihP);
free(buf);
}
FDH_CLOSE(fdP);
- fdP = NULL;
VOL_LOCK;
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ VChangeState_r(vp, vol_state_save);
+ VCancelReservation_r(vp);
+#endif
goto sane;
+
error_encountered:
#ifdef AFS_DEMAND_ATTACH_FS
- VOL_LOCK;
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
+ /*
+ * close the file handle
+ * acquire VOL_LOCK
+ * invalidate the vnode
+ * free up the bitmap entry (although salvager should take care of it)
+ * salvage the volume
+ * drop vnode lock and refs
+ */
if (fdP)
FDH_CLOSE(fdP);
+ VOL_LOCK;
+ VFreeBitMapEntry_r(ec, &vp->vnodeIndex[class], bitNumber);
VInvalidateVnode_r(vnp);
- StickOnLruChain_r(vnp, vcp);
+ VnUnlock(vnp, WRITE_LOCK);
+ VnCancelReservation_r(vnp);
+ VRequestSalvage_r(ec, vp, SALVSYNC_ERROR, 0);
+ VCancelReservation_r(vp);
return NULL;
#else
assert(1 == 2);
}
sane:
- VNLog(4, 2, vnodeNumber, (afs_int32) vnp);
- AddToVnHashByVolumeTable(vnp);
- moveHash(vnp, newHash);
+ VNLog(4, 2, vnodeNumber, (afs_int32) vnp, 0, 0);
+#ifndef AFS_DEMAND_ATTACH_FS
+ AddToVnHash(vnp);
+#endif
}
- VNLog(5, 1, (afs_int32) vnp);
-#ifdef AFS_PTHREAD_ENV
- vnp->writer = pthread_self();
-#else /* AFS_PTHREAD_ENV */
- LWP_CurrentProcess(&vnp->writer);
-#endif /* AFS_PTHREAD_ENV */
+ VNLog(5, 1, (afs_int32) vnp, 0, 0, 0);
memset(&vnp->disk, 0, sizeof(vnp->disk));
vnp->changed_newTime = 0; /* set this bit when vnode is updated */
vnp->changed_oldTime = 0; /* set this on CopyOnWrite. */
vnp->handle = NULL;
vcp->allocs++;
vp->header->diskstuff.filecount++;
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_EXCLUSIVE);
+#endif
return vnp;
}
-Vnode *
-VGetVnode(Error * ec, Volume * vp, VnodeId vnodeNumber, int locktype)
-{ /* READ_LOCK or WRITE_LOCK, as defined in lock.h */
- Vnode *retVal;
- VOL_LOCK;
- retVal = VGetVnode_r(ec, vp, vnodeNumber, locktype);
- VOL_UNLOCK;
- return retVal;
-}
-
-Vnode *
-VGetVnode_r(Error * ec, Volume * vp, VnodeId vnodeNumber, int locktype)
-{ /* READ_LOCK or WRITE_LOCK, as defined in lock.h */
- register Vnode *vnp;
- int newHash;
- VnodeClass class;
- struct VnodeClassInfo *vcp;
+/**
+ * load a vnode from disk.
+ *
+ * @param[out] ec client error code return
+ * @param[in] vp volume object pointer
+ * @param[in] vnp vnode object pointer
+ * @param[in] vcp vnode class info object pointer
+ * @param[in] class vnode class enumeration
+ *
+ * @pre vnode is registered in appropriate data structures;
+ * caller holds a ref on vnode; VOL_LOCK is held
+ *
+ * @post vnode data is loaded from disk.
+ * vnode state is set to VN_STATE_ONLINE.
+ * on failure, vnode is invalidated.
+ *
+ * @internal vnode package internal use only
+ */
+static void
+VnLoad(Error * ec, Volume * vp, Vnode * vnp,
+ struct VnodeClassInfo * vcp, VnodeClass class)
+{
+ /* vnode not cached */
+ Error error;
+ int n, dosalv = 1;
+ IHandle_t *ihP = vp->vnodeIndex[class].handle;
+ FdHandle_t *fdP;
*ec = 0;
- mlkReason = 0; /* last call didn't fail */
+ vcp->reads++;
- if (vnodeNumber == 0) {
- *ec = VNOVNODE;
- mlkReason = 1;
- return NULL;
- }
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_LOAD);
+#endif
- VNLog(100, 1, vnodeNumber);
- if (programType == fileServer && !V_inUse(vp)) {
- *ec = (vp->specialStatus ? vp->specialStatus : VOFFLINE);
+ /* This will never block */
+ VnLock(vnp, WRITE_LOCK, VOL_LOCK_HELD, WILL_NOT_DEADLOCK);
- /* If the volume is VBUSY (being cloned or dumped) and this is
- * a READ operation, then don't fail.
- */
- if ((*ec != VBUSY) || (locktype != READ_LOCK)) {
- mlkReason = 2;
- return NULL;
+ VOL_UNLOCK;
+ fdP = IH_OPEN(ihP);
+ if (fdP == NULL) {
+ Log("VnLoad: can't open index dev=%u, i=%s\n", vp->device,
+ PrintInode(NULL, vp->vnodeIndex[class].handle->ih_ino));
+ *ec = VIO;
+ goto error_encountered_nolock;
+ } else if (FDH_SEEK(fdP, vnodeIndexOffset(vcp, Vn_id(vnp)), SEEK_SET)
+ < 0) {
+ Log("VnLoad: can't seek on index file vn=%u\n", Vn_id(vnp));
+ *ec = VIO;
+ goto error_encountered_nolock;
+ } else if ((n = FDH_READ(fdP, (char *)&vnp->disk, vcp->diskSize))
+ != vcp->diskSize) {
+ /* Don't take volume off line if the inumber is out of range
+ * or the inode table is full. */
+ if (n == BAD_IGET) {
+ Log("VnLoad: bad inumber %s\n",
+ PrintInode(NULL, vp->vnodeIndex[class].handle->ih_ino));
+ *ec = VIO;
+ dosalv = 0;
+ } else if (n == -1 && errno == EIO) {
+ /* disk error; salvage */
+ Log("VnLoad: Couldn't read vnode %u, volume %u (%s); volume needs salvage\n", Vn_id(vnp), V_id(vp), V_name(vp));
+ } else {
+ /* vnode is not allocated */
+ if (LogLevel >= 5)
+ Log("VnLoad: Couldn't read vnode %u, volume %u (%s); read %d bytes, errno %d\n",
+ Vn_id(vnp), V_id(vp), V_name(vp), n, errno);
+ *ec = VIO;
+ dosalv = 0;
}
- *ec = 0;
- }
- class = vnodeIdToClass(vnodeNumber);
- vcp = &VnodeClassInfo[class];
- if (locktype == WRITE_LOCK && !VolumeWriteable(vp)) {
- *ec = (bit32) VREADONLY;
- mlkReason = 3;
- return NULL;
+ goto error_encountered_nolock;
}
+ FDH_CLOSE(fdP);
+ VOL_LOCK;
- if (locktype == WRITE_LOCK && programType == fileServer) {
- VAddToVolumeUpdateList_r(ec, vp);
- if (*ec) {
- mlkReason = 1000 + *ec;
- return NULL;
+ /* Quick check to see that the data is reasonable */
+ if (vnp->disk.vnodeMagic != vcp->magic || vnp->disk.type == vNull) {
+ if (vnp->disk.type == vNull) {
+ *ec = VNOVNODE;
+ dosalv = 0;
+ } else {
+ struct vnodeIndex *index = &vp->vnodeIndex[class];
+ unsigned int bitNumber = vnodeIdToBitNumber(Vn_id(vnp));
+ unsigned int offset = bitNumber >> 3;
+
+ /* Test to see if vnode number is valid. */
+ if ((offset >= index->bitmapSize)
+ || ((*(index->bitmap + offset) & (1 << (bitNumber & 0x7)))
+ == 0)) {
+ Log("VnLoad: Request for unallocated vnode %u, volume %u (%s) denied.\n", Vn_id(vnp), V_id(vp), V_name(vp));
+ *ec = VNOVNODE;
+ dosalv = 0;
+ } else {
+ Log("VnLoad: Bad magic number, vnode %u, volume %u (%s); volume needs salvage\n", Vn_id(vnp), V_id(vp), V_name(vp));
+ }
}
+ goto error_encountered;
}
- /* See whether the vnode is in the cache. */
- newHash = VNODE_HASH(vp, vnodeNumber);
- for (vnp = VnodeHashTable[newHash];
- vnp && (vnp->vnodeNumber != vnodeNumber || vnp->volumePtr != vp
- || vnp->volumePtr->cacheCheck != vnp->cacheCheck);
- vnp = vnp->hashNext);
- vcp->gets++;
- if (vnp == NULL) {
- int n;
- IHandle_t *ihP = vp->vnodeIndex[class].handle;
- FdHandle_t *fdP;
- /* Not in cache; tentatively grab most distantly used one from the LRU
- * chain */
- vcp->reads++;
- vnp = VGetFreeVnode_r(vcp);
- /* Remove it from the old hash chain */
- if (vnp->volumePtr)
- DeleteFromVnHashByVolumeTable(vnp);
- moveHash(vnp, newHash);
- /* Remove it from the LRU chain */
- if (vnp == vcp->lruHead)
- vcp->lruHead = vcp->lruHead->lruNext;
- if (vnp == vcp->lruHead || vcp->lruHead == NULL)
- Abort("VGetVnode: lru chain addled!\n");
- vnp->lruPrev->lruNext = vnp->lruNext;
- vnp->lruNext->lruPrev = vnp->lruPrev;
- /* Initialize */
- vnp->changed_newTime = vnp->changed_oldTime = 0;
- vnp->delete = 0;
- vnp->vnodeNumber = vnodeNumber;
- vnp->volumePtr = vp;
- vnp->cacheCheck = vp->cacheCheck;
- vnp->nUsers = 1;
- AddToVnHashByVolumeTable(vnp);
-
- /* This will never block */
- ObtainWriteLock(&vnp->lock);
-#ifdef AFS_PTHREAD_ENV
- vnp->writer = pthread_self();
-#else /* AFS_PTHREAD_ENV */
- LWP_CurrentProcess(&vnp->writer);
-#endif /* AFS_PTHREAD_ENV */
+ IH_INIT(vnp->handle, V_device(vp), V_parentId(vp), VN_GET_INO(vnp));
+ VnUnlock(vnp, WRITE_LOCK);
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_ONLINE);
+#endif
+ return;
- /* Read vnode from volume index */
- VOL_UNLOCK;
- fdP = IH_OPEN(ihP);
- if (fdP == NULL) {
- Log("VGetVnode: can't open index dev=%u, i=%s\n", vp->device,
- PrintInode(NULL, vp->vnodeIndex[class].handle->ih_ino));
+
+ error_encountered_nolock:
+ if (fdP) {
+ FDH_REALLYCLOSE(fdP);
+ }
+ VOL_LOCK;
+
+ error_encountered:
+ if (dosalv) {
#ifdef AFS_DEMAND_ATTACH_FS
- VOL_LOCK;
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- VOL_UNLOCK;
+ VRequestSalvage_r(&error, vp, SALVSYNC_ERROR, 0);
+#else
+ VForceOffline_r(vp, 0);
+ error = VSALVAGE;
#endif
- *ec = VIO;
- mlkReason = 9;
- } else if (FDH_SEEK(fdP, vnodeIndexOffset(vcp, vnodeNumber), SEEK_SET)
- < 0) {
- Log("VGetVnode: can't seek on index file vn=%u\n", vnodeNumber);
+ if (!*ec)
+ *ec = error;
+ }
+
+ VInvalidateVnode_r(vnp);
+ VnUnlock(vnp, WRITE_LOCK);
+}
+
+/**
+ * store a vnode to disk.
+ *
+ * @param[out] ec error code output
+ * @param[in] vp volume object pointer
+ * @param[in] vnp vnode object pointer
+ * @param[in] vcp vnode class info object pointer
+ * @param[in] class vnode class enumeration
+ *
+ * @pre VOL_LOCK held.
+ * caller holds refs to volume and vnode.
+ * DAFS: caller is responsible for performing state sanity checks.
+ *
+ * @post vnode state is stored to disk.
+ *
+ * @internal vnode package internal use only
+ */
+static void
+VnStore(Error * ec, Volume * vp, Vnode * vnp,
+ struct VnodeClassInfo * vcp, VnodeClass class)
+{
+ int offset, code;
+ IHandle_t *ihP = vp->vnodeIndex[class].handle;
+ FdHandle_t *fdP;
#ifdef AFS_DEMAND_ATTACH_FS
- VOL_LOCK;
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- VOL_UNLOCK;
+ VnState vn_state_save;
+#endif
+
+ *ec = 0;
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ vn_state_save = VnChangeState_r(vnp, VN_STATE_STORE);
#endif
+
+ offset = vnodeIndexOffset(vcp, Vn_id(vnp));
+ VOL_UNLOCK;
+ fdP = IH_OPEN(ihP);
+ if (fdP == NULL) {
+ Log("VnStore: can't open index file!\n");
+ goto error_encountered;
+ }
+ if (FDH_SEEK(fdP, offset, SEEK_SET) < 0) {
+ Log("VnStore: can't seek on index file! fdp=0x%x offset=%d, errno=%d\n",
+ fdP, offset, errno);
+ goto error_encountered;
+ }
+
+ code = FDH_WRITE(fdP, &vnp->disk, vcp->diskSize);
+ if (code != vcp->diskSize) {
+ /* Don't force volume offline if the inumber is out of
+ * range or the inode table is full.
+ */
+ FDH_REALLYCLOSE(fdP);
+ if (code == BAD_IGET) {
+ Log("VnStore: bad inumber %s\n",
+ PrintInode(NULL,
+ vp->vnodeIndex[class].handle->ih_ino));
*ec = VIO;
- mlkReason = 10;
- FDH_REALLYCLOSE(fdP);
- } else if ((n = FDH_READ(fdP, (char *)&vnp->disk, vcp->diskSize))
- != vcp->diskSize) {
- /* Don't take volume off line if the inumber is out of range
- * or the inode table is full. */
- FDH_REALLYCLOSE(fdP);
VOL_LOCK;
- if (n == BAD_IGET) {
- Log("VGetVnode: bad inumber %s\n",
- PrintInode(NULL, vp->vnodeIndex[class].handle->ih_ino));
- *ec = VIO;
- mlkReason = 4;
- }
- /* Check for disk errors. Anything else just means that the vnode
- * is not allocated */
- if (n == -1 && errno == EIO) {
- Log("VGetVnode: Couldn't read vnode %u, volume %u (%s); volume needs salvage\n", vnodeNumber, V_id(vp), V_name(vp));
#ifdef AFS_DEMAND_ATTACH_FS
- if (programType == fileServer) {
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
- } else {
- VForceOffline_r(vp, 0);
- *ec = VSALVAGE;
- }
+ VnChangeState_r(vnp, VN_STATE_ERROR);
+#endif
+ } else {
+ Log("VnStore: Couldn't write vnode %u, volume %u (%s) (error %d)\n", Vn_id(vnp), V_id(Vn_volume(vnp)), V_name(Vn_volume(vnp)), code);
+#ifdef AFS_DEMAND_ATTACH_FS
+ goto error_encountered;
#else
- VForceOffline_r(vp, 0);
- *ec = VSALVAGE;
+ VOL_LOCK;
+ VForceOffline_r(vp, 0);
+ *ec = VSALVAGE;
#endif
- mlkReason = 4;
- } else {
- /* Probably legit; Don't knock the volume offline */
- if (LogLevel >= 5)
- Log("VGetVnode: Couldn't read vnode %u, volume %u (%s); errno %d\n", vnodeNumber, V_id(vp), V_name(vp), errno);
- mlkReason = 5;
- *ec = VIO;
- }
- VInvalidateVnode_r(vnp);
- if (vnp->nUsers-- == 1)
- StickOnLruChain_r(vnp, vcp);
- ReleaseWriteLock(&vnp->lock);
- return NULL;
}
+ return;
+ } else {
FDH_CLOSE(fdP);
- VOL_LOCK;
- /* Quick check to see that the data is reasonable */
- if (vnp->disk.vnodeMagic != vcp->magic || vnp->disk.type == vNull) {
- if (vnp->disk.type == vNull) {
- *ec = VNOVNODE;
- mlkReason = 6;
- VInvalidateVnode_r(vnp);
- if (vnp->nUsers-- == 1)
- StickOnLruChain_r(vnp, vcp);
- ReleaseWriteLock(&vnp->lock);
- return NULL; /* The vnode is not allocated */
- } else {
- struct vnodeIndex *index = &vp->vnodeIndex[class];
- unsigned int bitNumber = vnodeIdToBitNumber(vnodeNumber);
- unsigned int offset = bitNumber >> 3;
-
- /* Test to see if vnode number is valid. */
- if ((offset >= index->bitmapSize)
- || ((*(index->bitmap + offset) & (1 << (bitNumber & 0x7)))
- == 0)) {
- Log("VGetVnode: Request for unallocated vnode %u, volume %u (%s) denied.\n", vnodeNumber, V_id(vp), V_name(vp));
- mlkReason = 11;
- *ec = VNOVNODE;
- } else {
- Log("VGetVnode: Bad magic number, vnode %u, volume %u (%s); volume needs salvage\n", vnodeNumber, V_id(vp), V_name(vp));
+ }
+
+ VOL_LOCK;
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, vn_state_save);
+#endif
+ return;
+
+ error_encountered:
#ifdef AFS_DEMAND_ATTACH_FS
- if (programType == fileServer) {
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
- } else {
- vp->goingOffline = 1;
- *ec = VSALVAGE;
- }
+ /* XXX instead of dumping core, let's try to request a salvage
+ * and just fail the putvnode */
+ if (fdP)
+ FDH_CLOSE(fdP);
+ VOL_LOCK;
+ VnChangeState_r(vnp, VN_STATE_ERROR);
+ VRequestSalvage_r(ec, vp, SALVSYNC_ERROR, 0);
#else
- vp->goingOffline = 1; /* used to call VOffline, but that would mess
- * up the volume ref count if called here */
- *ec = VSALVAGE;
+ assert(1 == 2);
#endif
- mlkReason = 7;
- }
- VInvalidateVnode_r(vnp);
- if (vnp->nUsers-- == 1)
- StickOnLruChain_r(vnp, vcp);
- ReleaseWriteLock(&vnp->lock);
- return NULL;
- }
+}
+
+/**
+ * get a handle to a vnode object.
+ *
+ * @param[out] ec error code
+ * @param[in] vp volume object
+ * @param[in] vnodeNumber vnode id
+ * @param[in] locktype type of lock to acquire
+ *
+ * @return vnode object pointer
+ *
+ * @see VGetVnode_r
+ */
+Vnode *
+VGetVnode(Error * ec, Volume * vp, VnodeId vnodeNumber, int locktype)
+{ /* READ_LOCK or WRITE_LOCK, as defined in lock.h */
+ Vnode *retVal;
+ VOL_LOCK;
+ retVal = VGetVnode_r(ec, vp, vnodeNumber, locktype);
+ VOL_UNLOCK;
+ return retVal;
+}
+
+/**
+ * get a handle to a vnode object.
+ *
+ * @param[out] ec error code
+ * @param[in] vp volume object
+ * @param[in] vnodeNumber vnode id
+ * @param[in] locktype type of lock to acquire
+ *
+ * @return vnode object pointer
+ *
+ * @internal vnode package internal use only
+ *
+ * @pre VOL_LOCK held.
+ * heavyweight ref held on volume object.
+ */
+Vnode *
+VGetVnode_r(Error * ec, Volume * vp, VnodeId vnodeNumber, int locktype)
+{ /* READ_LOCK or WRITE_LOCK, as defined in lock.h */
+ register Vnode *vnp;
+ VnodeClass class;
+ struct VnodeClassInfo *vcp;
+
+ *ec = 0;
+
+ if (vnodeNumber == 0) {
+ *ec = VNOVNODE;
+ return NULL;
+ }
+
+ VNLog(100, 1, vnodeNumber, 0, 0, 0);
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ /*
+ * once a volume has entered an error state, don't permit
+ * further operations to proceed
+ * -- tkeiser 11/21/2007
+ */
+ VWaitExclusiveState_r(vp);
+ if (VIsErrorState(V_attachState(vp))) {
+ /* XXX is VSALVAGING acceptable here? */
+ *ec = VSALVAGING;
+ return NULL;
+ }
+#endif
+
+ if (programType == fileServer && !V_inUse(vp)) {
+ *ec = (vp->specialStatus ? vp->specialStatus : VOFFLINE);
+
+ /* If the volume is VBUSY (being cloned or dumped) and this is
+ * a READ operation, then don't fail.
+ */
+ if ((*ec != VBUSY) || (locktype != READ_LOCK)) {
+ return NULL;
}
- IH_INIT(vnp->handle, V_device(vp), V_parentId(vp), VN_GET_INO(vnp));
- ReleaseWriteLock(&vnp->lock);
- } else {
- VNLog(101, 2, vnodeNumber, (afs_int32) vnp);
- if (++vnp->nUsers == 1) {
- /* First user. Remove it from the LRU chain. We can assume that
- * there is at least one item in the queue */
- if (vnp == vcp->lruHead)
- vcp->lruHead = vcp->lruHead->lruNext;
- if (vnp == vcp->lruHead || vcp->lruHead == NULL)
- Abort("VGetVnode: lru chain addled!\n");
- vnp->lruPrev->lruNext = vnp->lruNext;
- vnp->lruNext->lruPrev = vnp->lruPrev;
+ *ec = 0;
+ }
+ class = vnodeIdToClass(vnodeNumber);
+ vcp = &VnodeClassInfo[class];
+ if (locktype == WRITE_LOCK && !VolumeWriteable(vp)) {
+ *ec = (bit32) VREADONLY;
+ return NULL;
+ }
+
+ if (locktype == WRITE_LOCK && programType == fileServer) {
+ VAddToVolumeUpdateList_r(ec, vp);
+ if (*ec) {
+ return NULL;
}
}
- VOL_UNLOCK;
- if (locktype == READ_LOCK)
- ObtainReadLock(&vnp->lock);
- else {
- ObtainWriteLock(&vnp->lock);
-#ifdef AFS_PTHREAD_ENV
- vnp->writer = pthread_self();
-#else /* AFS_PTHREAD_ENV */
- LWP_CurrentProcess(&vnp->writer);
-#endif /* AFS_PTHREAD_ENV */
+
+ vcp->gets++;
+
+ /* See whether the vnode is in the cache. */
+ vnp = VLookupVnode(vp, vnodeNumber);
+ if (vnp) {
+ /* vnode is in cache */
+
+ VNLog(101, 2, vnodeNumber, (afs_int32) vnp, 0, 0);
+ VnCreateReservation_r(vnp);
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ /*
+ * this is the one DAFS case where we may run into contention.
+ * here's the basic control flow:
+ *
+ * if locktype is READ_LOCK:
+ * wait until vnode is not exclusive
+ * set to VN_STATE_READ
+ * increment read count
+ * done
+ * else
+ * wait until vnode is quiescent
+ * set to VN_STATE_EXCLUSIVE
+ * done
+ */
+ if (locktype == READ_LOCK) {
+ VnWaitExclusiveState_r(vnp);
+ } else {
+ VnWaitQuiescent_r(vnp);
+ }
+
+ if (VnIsErrorState(Vn_state(vnp))) {
+ VnCancelReservation_r(vnp);
+ *ec = VSALVAGE;
+ return NULL;
+ }
+#endif /* AFS_DEMAND_ATTACH_FS */
+ } else {
+ /* vnode not cached */
+
+ /* Not in cache; tentatively grab most distantly used one from the LRU
+ * chain */
+ vcp->reads++;
+ vnp = VGetFreeVnode_r(vcp);
+
+ /* Initialize */
+ vnp->changed_newTime = vnp->changed_oldTime = 0;
+ vnp->delete = 0;
+ Vn_id(vnp) = vnodeNumber;
+ VnCreateReservation_r(vnp);
+ AddToVVnList(vp, vnp);
+#ifdef AFS_DEMAND_ATTACH_FS
+ AddToVnHash(vnp);
+#endif
+
+ /*
+ * XXX for non-DAFS, there is a serious
+ * race condition here:
+ *
+ * two threads can race to load a vnode. the net
+ * result is two struct Vnodes can be allocated
+ * and hashed, which point to the same underlying
+ * disk data store. conflicting vnode locks can
+ * thus be held concurrently.
+ *
+ * for non-DAFS to be safe, VOL_LOCK really shouldn't
+ * be dropped in VnLoad. Of course, this would likely
+ * lead to an unacceptable slow-down.
+ */
+
+ VnLoad(ec, vp, vnp, vcp, class);
+ if (*ec) {
+ VnCancelReservation_r(vnp);
+ return NULL;
+ }
+#ifndef AFS_DEMAND_ATTACH_FS
+ AddToVnHash(vnp);
+#endif
+ /*
+ * DAFS:
+ * there is no possibility for contention. we "own" this vnode.
+ */
}
- VOL_LOCK;
+
+ /*
+ * DAFS:
+ * it is imperative that nothing drop vol lock between here
+ * and the VnBeginRead/VnChangeState stanza below
+ */
+
+ VnLock(vnp, locktype, VOL_LOCK_HELD, MIGHT_DEADLOCK);
+
/* Check that the vnode hasn't been removed while we were obtaining
* the lock */
- VNLog(102, 2, vnodeNumber, (afs_int32) vnp);
- if ((vnp->disk.type == vNull) || (vnp->cacheCheck == 0)) {
- if (vnp->nUsers-- == 1)
- StickOnLruChain_r(vnp, vcp);
- if (locktype == READ_LOCK)
- ReleaseReadLock(&vnp->lock);
- else
- ReleaseWriteLock(&vnp->lock);
+ VNLog(102, 2, vnodeNumber, (afs_int32) vnp, 0, 0);
+ if ((vnp->disk.type == vNull) || (Vn_cacheCheck(vnp) == 0)) {
+ VnUnlock(vnp, locktype);
+ VnCancelReservation_r(vnp);
*ec = VNOVNODE;
- mlkReason = 8;
/* vnode is labelled correctly by now, so we don't have to invalidate it */
return NULL;
}
+
+#ifdef AFS_DEMAND_ATTACH_FS
+ if (locktype == READ_LOCK) {
+ VnBeginRead_r(vnp);
+ } else {
+ VnChangeState_r(vnp, VN_STATE_EXCLUSIVE);
+ }
+#endif
+
if (programType == fileServer)
- VBumpVolumeUsage_r(vnp->volumePtr); /* Hack; don't know where it should be
+ VBumpVolumeUsage_r(Vn_volume(vnp)); /* Hack; don't know where it should be
* called from. Maybe VGetVolume */
return vnp;
}
VOL_UNLOCK;
}
+/**
+ * put back a handle to a vnode object.
+ *
+ * @param[out] ec client error code
+ * @param[in] vnp vnode object pointer
+ *
+ * @pre VOL_LOCK held.
+ * ref held on vnode.
+ *
+ * @post ref dropped on vnode.
+ * if vnode was modified or deleted, it is written out to disk
+ * (assuming a write lock was held).
+ *
+ * @internal volume package internal use only
+ */
void
VPutVnode_r(Error * ec, register Vnode * vnp)
{
- int writeLocked, offset;
+ int writeLocked;
VnodeClass class;
struct VnodeClassInfo *vcp;
- int code;
*ec = 0;
- assert(vnp->nUsers != 0);
- class = vnodeIdToClass(vnp->vnodeNumber);
+ assert(Vn_refcount(vnp) != 0);
+ class = vnodeIdToClass(Vn_id(vnp));
vcp = &VnodeClassInfo[class];
assert(vnp->disk.vnodeMagic == vcp->magic);
- VNLog(200, 2, vnp->vnodeNumber, (afs_int32) vnp);
+ VNLog(200, 2, Vn_id(vnp), (afs_int32) vnp, 0, 0);
+#ifdef AFS_DEMAND_ATTACH_FS
+ writeLocked = (Vn_state(vnp) == VN_STATE_EXCLUSIVE);
+#else
writeLocked = WriteLocked(&vnp->lock);
+#endif
+
if (writeLocked) {
+ /* sanity checks */
#ifdef AFS_PTHREAD_ENV
pthread_t thisProcess = pthread_self();
#else /* AFS_PTHREAD_ENV */
VNLog(201, 2, (afs_int32) vnp,
((vnp->changed_newTime) << 1) | ((vnp->
changed_oldTime) << 1) | vnp->
- delete);
+ delete, 0, 0);
if (thisProcess != vnp->writer)
Abort("VPutVnode: Vnode at 0x%x locked by another process!\n",
vnp);
+
+
if (vnp->changed_oldTime || vnp->changed_newTime || vnp->delete) {
- Volume *vp = vnp->volumePtr;
+ Volume *vp = Vn_volume(vnp);
afs_uint32 now = FT_ApproxTime();
- assert(vnp->cacheCheck == vp->cacheCheck);
+ assert(Vn_cacheCheck(vnp) == vp->cacheCheck);
if (vnp->delete) {
/* No longer any directory entries for this vnode. Free the Vnode */
memset(&vnp->disk, 0, sizeof(vnp->disk));
- mlkLastDelete = vnp->vnodeNumber;
/* delete flag turned off further down */
- VNLog(202, 2, vnp->vnodeNumber, (afs_int32) vnp);
+ VNLog(202, 2, Vn_id(vnp), (afs_int32) vnp, 0, 0);
} else if (vnp->changed_newTime) {
vnp->disk.serverModifyTime = now;
}
/* The vnode has been changed. Write it out to disk */
if (!V_inUse(vp)) {
#ifdef AFS_DEMAND_ATTACH_FS
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
+ VRequestSalvage_r(ec, vp, SALVSYNC_ERROR, 0);
#else
assert(V_needsSalvaged(vp));
*ec = VSALVAGE;
#endif
} else {
- IHandle_t *ihP = vp->vnodeIndex[class].handle;
- FdHandle_t *fdP;
- VOL_UNLOCK;
- fdP = IH_OPEN(ihP);
- if (fdP == NULL) {
- Log("VPutVnode: can't open index file!\n");
- goto error_encountered;
- }
- offset = vnodeIndexOffset(vcp, vnp->vnodeNumber);
- if (FDH_SEEK(fdP, offset, SEEK_SET) < 0) {
- Log("VPutVnode: can't seek on index file! fdp=0x%x offset=%d, errno=%d\n",
- fdP, offset, errno);
- goto error_encountered;
- }
- code = FDH_WRITE(fdP, &vnp->disk, vcp->diskSize);
- if (code != vcp->diskSize) {
- /* Don't force volume offline if the inumber is out of
- * range or the inode table is full.
- */
- VOL_LOCK;
- if (code == BAD_IGET) {
- Log("VPutVnode: bad inumber %s\n",
- PrintInode(NULL,
- vp->vnodeIndex[class].handle->ih_ino));
- *ec = VIO;
- } else {
- Log("VPutVnode: Couldn't write vnode %u, volume %u (%s) (error %d)\n", vnp->vnodeNumber, V_id(vnp->volumePtr), V_name(vnp->volumePtr), code);
-#ifdef AFS_DEMAND_ATTACH_FS
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
-#else
- VForceOffline_r(vp, 0);
- *ec = VSALVAGE;
-#endif
- }
- VOL_UNLOCK;
- FDH_REALLYCLOSE(fdP);
- } else {
- FDH_CLOSE(fdP);
- }
- VOL_LOCK;
- goto sane;
+ VnStore(ec, vp, vnp, vcp, class);
- error_encountered:
-#ifdef AFS_DEMAND_ATTACH_FS
- /* XXX instead of dumping core, let's try to request a salvage
- * and just fail the putvnode */
- if (fdP)
- FDH_CLOSE(fdP);
- VOL_LOCK;
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
- goto done;
-#else
- assert(1 == 2);
-#endif
-
- sane:
/* If the vnode is to be deleted, and we wrote the vnode out,
* free its bitmap entry. Do after the vnode is written so we
* don't allocate from bitmap before the vnode is written
* (doing so could cause a "addled bitmap" message).
*/
if (vnp->delete && !*ec) {
- if (vnp->volumePtr->header->diskstuff.filecount-- < 1)
- vnp->volumePtr->header->diskstuff.filecount = 0;
+ if (Vn_volume(vnp)->header->diskstuff.filecount-- < 1)
+ Vn_volume(vnp)->header->diskstuff.filecount = 0;
VFreeBitMapEntry_r(ec, &vp->vnodeIndex[class],
- vnodeIdToBitNumber(vnp->vnodeNumber));
+ vnodeIdToBitNumber(Vn_id(vnp)));
}
}
vcp->writes++;
vnp->changed_newTime = vnp->changed_oldTime = 0;
}
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_ONLINE);
+#endif
} else { /* Not write locked */
if (vnp->changed_newTime || vnp->changed_oldTime || vnp->delete)
Abort
("VPutVnode: Change or delete flag for vnode 0x%x is set but vnode is not write locked!\n",
vnp);
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnEndRead_r(vnp);
+#endif
}
- done:
/* Do not look at disk portion of vnode after this point; it may
* have been deleted above */
- if (vnp->nUsers-- == 1)
- StickOnLruChain_r(vnp, vcp);
vnp->delete = 0;
-
- if (writeLocked)
- ReleaseWriteLock(&vnp->lock);
- else
- ReleaseReadLock(&vnp->lock);
+ VnUnlock(vnp, ((writeLocked) ? WRITE_LOCK : READ_LOCK));
+ VnCancelReservation_r(vnp);
}
/*
return retVal;
}
+/**
+ * convert vnode handle from mutually exclusive to shared access.
+ *
+ * @param[out] ec client error code
+ * @param[in] vnp vnode object pointer
+ *
+ * @return unspecified use (see out argument 'ec' for error code return)
+ *
+ * @pre VOL_LOCK held.
+ * ref held on vnode.
+ * write lock held on vnode.
+ *
+ * @post read lock held on vnode.
+ * if vnode was modified, it has been written to disk.
+ *
+ * @internal volume package internal use only
+ */
int
VVnodeWriteToRead_r(Error * ec, register Vnode * vnp)
{
int writeLocked;
VnodeClass class;
struct VnodeClassInfo *vcp;
- int code;
#ifdef AFS_PTHREAD_ENV
pthread_t thisProcess;
#else /* AFS_PTHREAD_ENV */
#endif /* AFS_PTHREAD_ENV */
*ec = 0;
- assert(vnp->nUsers != 0);
- class = vnodeIdToClass(vnp->vnodeNumber);
+ assert(Vn_refcount(vnp) != 0);
+ class = vnodeIdToClass(Vn_id(vnp));
vcp = &VnodeClassInfo[class];
assert(vnp->disk.vnodeMagic == vcp->magic);
- writeLocked = WriteLocked(&vnp->lock);
- VNLog(300, 2, vnp->vnodeNumber, (afs_int32) vnp);
+ VNLog(300, 2, Vn_id(vnp), (afs_int32) vnp, 0, 0);
+#ifdef AFS_DEMAND_ATTACH_FS
+ writeLocked = (Vn_state(vnp) == VN_STATE_EXCLUSIVE);
+#else
+ writeLocked = WriteLocked(&vnp->lock);
+#endif
if (!writeLocked) {
return 0;
}
+
+
+ VNLog(301, 2, (afs_int32) vnp,
+ ((vnp->changed_newTime) << 1) | ((vnp->
+ changed_oldTime) << 1) | vnp->
+ delete, 0, 0);
+
+ /* sanity checks */
#ifdef AFS_PTHREAD_ENV
thisProcess = pthread_self();
#else /* AFS_PTHREAD_ENV */
LWP_CurrentProcess(&thisProcess);
#endif /* AFS_PTHREAD_ENV */
-
- VNLog(301, 2, (afs_int32) vnp,
- ((vnp->changed_newTime) << 1) | ((vnp->
- changed_oldTime) << 1) | vnp->
- delete);
if (thisProcess != vnp->writer)
Abort("VPutVnode: Vnode at 0x%x locked by another process!\n",
(int)vnp);
+
if (vnp->delete) {
return 0;
}
if (vnp->changed_oldTime || vnp->changed_newTime) {
- Volume *vp = vnp->volumePtr;
+ Volume *vp = Vn_volume(vnp);
afs_uint32 now = FT_ApproxTime();
- assert(vnp->cacheCheck == vp->cacheCheck);
+ assert(Vn_cacheCheck(vnp) == vp->cacheCheck);
if (vnp->changed_newTime)
vnp->disk.serverModifyTime = now;
if (vnp->changed_newTime)
/* The inode has been changed. Write it out to disk */
if (!V_inUse(vp)) {
#ifdef AFS_DEMAND_ATTACH_FS
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
+ VRequestSalvage_r(ec, vp, SALVSYNC_ERROR, 0);
#else
assert(V_needsSalvaged(vp));
*ec = VSALVAGE;
#endif
} else {
- IHandle_t *ihP = vp->vnodeIndex[class].handle;
- FdHandle_t *fdP;
- off_t off = vnodeIndexOffset(vcp, vnp->vnodeNumber);
- VOL_UNLOCK;
- fdP = IH_OPEN(ihP);
- if (fdP == NULL) {
- Log("VPutVnode: can't open index file!\n");
- goto error_encountered;
- }
- code = FDH_SEEK(fdP, off, SEEK_SET);
- if (code < 0) {
- Log("VPutVnode: can't seek on index file!\n");
- goto error_encountered;
- }
- code = FDH_WRITE(fdP, &vnp->disk, vcp->diskSize);
- if (code != vcp->diskSize) {
- /*
- * Don't force volume offline if the inumber is out of
- * range or the inode table is full.
- */
- VOL_LOCK;
- if (code == BAD_IGET) {
- Log("VPutVnode: bad inumber %s\n",
- PrintInode(NULL,
- vp->vnodeIndex[class].handle->ih_ino));
- *ec = VIO;
- } else {
- Log("VPutVnode: Couldn't write vnode %u, volume %u (%s)\n", vnp->vnodeNumber, V_id(vnp->volumePtr), V_name(vnp->volumePtr));
-#ifdef AFS_DEMAND_ATTACH_FS
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
-#else
- VForceOffline_r(vp, 0);
- *ec = VSALVAGE;
-#endif
- }
- VOL_UNLOCK;
- }
- FDH_CLOSE(fdP);
- VOL_LOCK;
- goto sane;
-
- error_encountered:
-#ifdef AFS_DEMAND_ATTACH_FS
- if (fdP)
- FDH_CLOSE(fdP);
- VOL_LOCK;
- VRequestSalvage_r(vp, SALVSYNC_ERROR, 0);
- *ec = VSALVAGING;
-#else
- assert(1 == 2);
-#endif
-
+ VnStore(ec, vp, vnp, vcp, class);
}
- sane:
vcp->writes++;
vnp->changed_newTime = vnp->changed_oldTime = 0;
}
+ vnp->writer = 0;
+#ifdef AFS_DEMAND_ATTACH_FS
+ VnChangeState_r(vnp, VN_STATE_ONLINE);
+ VnBeginRead_r(vnp);
+#else
ConvertWriteToReadLock(&vnp->lock);
+#endif
return 0;
}
-/* Move the vnode, vnp, to the new hash table given by the
- hash table index, newHash */
+/**
+ * initial size of ihandle pointer vector.
+ *
+ * @see VInvalidateVnodesByVolume_r
+ */
+#define IH_VEC_BASE_SIZE 256
+
+/**
+ * increment amount for growing ihandle pointer vector.
+ *
+ * @see VInvalidateVnodesByVolume_r
+ */
+#define IH_VEC_INCREMENT 256
+
+/**
+ * Compile list of ihandles to be released/reallyclosed at a later time.
+ *
+ * @param[in] vp volume object pointer
+ * @param[out] vec_out vector of ihandle pointers to be released/reallyclosed
+ * @param[out] vec_len_out number of valid elements in ihandle vector
+ *
+ * @pre - VOL_LOCK is held
+ * - volume is in appropriate exclusive state (e.g. VOL_STATE_VNODE_CLOSE,
+ * VOL_STATE_VNODE_RELEASE)
+ *
+ * @post - all vnodes on VVn list are invalidated
+ * - ih_vec is populated with all valid ihandles
+ *
+ * @return operation status
+ * @retval 0 success
+ * @retval ENOMEM out of memory
+ *
+ * @todo we should handle out of memory conditions more gracefully.
+ *
+ * @internal vnode package internal use only
+ */
static int
-moveHash(register Vnode * vnp, bit32 newHash)
+VInvalidateVnodesByVolume_r(Volume * vp,
+ IHandle_t *** vec_out,
+ size_t * vec_len_out)
{
- Vnode *tvnp;
- /* Remove it from the old hash chain */
- tvnp = VnodeHashTable[vnp->hashIndex];
- if (tvnp == vnp)
- VnodeHashTable[vnp->hashIndex] = vnp->hashNext;
- else {
- while (tvnp && tvnp->hashNext != vnp)
- tvnp = tvnp->hashNext;
- if (tvnp)
- tvnp->hashNext = vnp->hashNext;
- }
- /* Add it to the new hash chain */
- vnp->hashNext = VnodeHashTable[newHash];
- VnodeHashTable[newHash] = vnp;
- vnp->hashIndex = newHash;
- return 0;
-}
+ int ret = 0;
+ Vnode *vnp, *nvnp;
+ size_t i = 0, vec_len;
+ IHandle_t **ih_vec, **ih_vec_new;
-private void
-StickOnLruChain_r(register Vnode * vnp, register struct VnodeClassInfo *vcp)
-{
- /* Add it to the circular LRU list */
- if (vcp->lruHead == NULL)
- Abort("VPutVnode: vcp->lruHead==NULL");
- else {
- vnp->lruNext = vcp->lruHead;
- vnp->lruPrev = vcp->lruHead->lruPrev;
- vcp->lruHead->lruPrev = vnp;
- vnp->lruPrev->lruNext = vnp;
- vcp->lruHead = vnp;
- }
- /* If the vnode was just deleted, put it at the end of the chain so it
- * will be reused immediately */
- if (vnp->delete)
- vcp->lruHead = vnp->lruNext;
- /* If caching is turned off, set volumeptr to NULL to invalidate the
- * entry */
- if (!TrustVnodeCacheEntry) {
- DeleteFromVnHashByVolumeTable(vnp);
- vnp->volumePtr = NULL;
+#ifdef AFS_DEMAND_ATTACH_FS
+ VOL_UNLOCK;
+#endif /* AFS_DEMAND_ATTACH_FS */
+
+ vec_len = IH_VEC_BASE_SIZE;
+ ih_vec = malloc(sizeof(IHandle_t *) * vec_len);
+#ifdef AFS_DEMAND_ATTACH_FS
+ VOL_LOCK;
+#endif
+ if (ih_vec == NULL)
+ return ENOMEM;
+
+ /*
+ * Traverse the volume's vnode list. Pull all the ihandles out into a
+ * thread-private array for later asynchronous processing.
+ */
+ restart_traversal:
+ for (queue_Scan(&vp->vnode_list, vnp, nvnp, Vnode)) {
+ if (vnp->handle != NULL) {
+ if (i == vec_len) {
+#ifdef AFS_DEMAND_ATTACH_FS
+ VOL_UNLOCK;
+#endif
+ vec_len += IH_VEC_INCREMENT;
+ ih_vec_new = realloc(ih_vec, sizeof(IHandle_t *) * vec_len);
+#ifdef AFS_DEMAND_ATTACH_FS
+ VOL_LOCK;
+#endif
+ if (ih_vec_new == NULL) {
+ ret = ENOMEM;
+ goto done;
+ }
+ ih_vec = ih_vec_new;
+#ifdef AFS_DEMAND_ATTACH_FS
+ /*
+ * Theoretically, the volume's VVn list should not change
+ * because the volume is in an exclusive state. For the
+ * sake of safety, we will restart the traversal from the
+ * the beginning (which is not expensive because we're
+ * deleting the items from the list as we go).
+ */
+ goto restart_traversal;
+#endif
+ }
+ ih_vec[i++] = vnp->handle;
+ vnp->handle = NULL;
+ }
+ DeleteFromVVnList(vnp);
+ VInvalidateVnode_r(vnp);
}
+
+ done:
+ *vec_out = ih_vec;
+ *vec_len_out = i;
+
+ return ret;
}
/* VCloseVnodeFiles - called when a volume is going off line. All open
void
VCloseVnodeFiles_r(Volume * vp)
{
- int i;
- Vnode *vnp, *nvnp;
- VnodeHashByVolumeChainHead * head;
+#ifdef AFS_DEMAND_ATTACH_FS
+ VolState vol_state_save;
+#endif
+ IHandle_t ** ih_vec;
+ size_t i, vec_len;
- head = &VnodeHashByVolumeTable[VNVOLUME_HASH(vp->hashid)];
#ifdef AFS_DEMAND_ATTACH_FS
- while (head->busy) {
- assert(pthread_cond_wait(&head->chain_busy_cv, &vol_glock_mutex) == 0);
- }
+ vol_state_save = VChangeState_r(vp, VOL_STATE_VNODE_CLOSE);
+#endif /* AFS_DEMAND_ATTACH_FS */
+
+ /* XXX need better error handling here */
+ assert(VInvalidateVnodesByVolume_r(vp,
+ &ih_vec,
+ &vec_len) == 0);
- head->busy = 1;
+ /*
+ * DAFS:
+ * now we drop VOL_LOCK while we perform some potentially very
+ * expensive operations in the background
+ */
+#ifdef AFS_DEMAND_ATTACH_FS
VOL_UNLOCK;
-#endif /* AFS_DEMAND_ATTACH_FS */
+#endif
- for (queue_Scan(head, vnp, nvnp, Vnode)) {
- if (vnp->volumePtr == vp) {
- IH_REALLYCLOSE(vnp->handle);
- }
+ for (i = 0; i < vec_len; i++) {
+ IH_REALLYCLOSE(ih_vec[i]);
}
+ free(ih_vec);
+
#ifdef AFS_DEMAND_ATTACH_FS
VOL_LOCK;
- head->busy = 0;
- assert(pthread_cond_broadcast(&head->chain_busy_cv) == 0);
+ VChangeState_r(vp, vol_state_save);
#endif /* AFS_DEMAND_ATTACH_FS */
}
-/* VReleaseVnodeFiles - called when a volume is going detached. All open
- * files for vnodes in that volume are closed and all inode handles
- * for vnodes in that volume are released.
+
+/**
+ * shut down all vnode cache state for a given volume.
+ *
+ * @param[in] vp volume object pointer
+ *
+ * @pre VOL_LOCK is held
+ *
+ * @post all file descriptors closed.
+ * all inode handles released.
+ * all vnode cache objects disassociated from volume.
+ *
+ * @note for DAFS, these operations are performed outside the vol glock under
+ * volume exclusive state VOL_STATE_VNODE_RELEASE. Please further note
+ * that it would be a bug to acquire and release a volume reservation
+ * during this exclusive operation. This is due to the fact that we are
+ * generally called during the refcount 1->0 transition.
+ *
+ * @todo we should handle failures in VInvalidateVnodesByVolume_r more
+ * gracefully.
+ *
+ * @see VInvalidateVnodesByVolume_r
+ *
+ * @internal this routine is internal to the volume package
*/
void
VReleaseVnodeFiles_r(Volume * vp)
{
- int i;
- Vnode *vnp, *nvnp;
- VnodeHashByVolumeChainHead * head;
-
- head = &VnodeHashByVolumeTable[VNVOLUME_HASH(vp->hashid)];
+#ifdef AFS_DEMAND_ATTACH_FS
+ VolState vol_state_save;
+#endif
+ IHandle_t ** ih_vec;
+ size_t i, vec_len;
#ifdef AFS_DEMAND_ATTACH_FS
- while (head->busy) {
- assert(pthread_cond_wait(&head->chain_busy_cv, &vol_glock_mutex) == 0);
- }
+ vol_state_save = VChangeState_r(vp, VOL_STATE_VNODE_RELEASE);
+#endif /* AFS_DEMAND_ATTACH_FS */
+
+ /* XXX need better error handling here */
+ assert(VInvalidateVnodesByVolume_r(vp,
+ &ih_vec,
+ &vec_len) == 0);
- head->busy = 1;
+ /*
+ * DAFS:
+ * now we drop VOL_LOCK while we perform some potentially very
+ * expensive operations in the background
+ */
+#ifdef AFS_DEMAND_ATTACH_FS
VOL_UNLOCK;
-#endif /* AFS_DEMAND_ATTACH_FS */
+#endif
- for (queue_Scan(head, vnp, nvnp, Vnode)) {
- if (vnp->volumePtr == vp) {
- IH_RELEASE(vnp->handle);
- }
+ for (i = 0; i < vec_len; i++) {
+ IH_RELEASE(ih_vec[i]);
}
+ free(ih_vec);
+
#ifdef AFS_DEMAND_ATTACH_FS
VOL_LOCK;
- head->busy = 0;
- assert(pthread_cond_broadcast(&head->chain_busy_cv) == 0);
+ VChangeState_r(vp, vol_state_save);
#endif /* AFS_DEMAND_ATTACH_FS */
}
git://git.openafs.org / openafs.git / blobdiff