#include "afs/afs_osidnlc.h"
/* Forward declarations. */
-static void afs_GetDownD(int anumber, int *aneedSpace);
+static void afs_GetDownD(int anumber, int *aneedSpace, afs_int32 buckethint);
static void afs_FreeDiscardedDCache(void);
static void afs_DiscardDCache(struct dcache *);
static void afs_FreeDCache(struct dcache *);
+/* For split cache */
+static afs_int32 afs_DCGetBucket(struct vcache *);
+static void afs_DCAdjustSize(struct dcache *, afs_int32, afs_int32);
+static void afs_DCMoveBucket(struct dcache *, afs_int32, afs_int32);
+static void afs_DCSizeInit(void);
+static afs_int32 afs_DCWhichBucket(afs_int32, afs_int32);
/*
* --------------------- Exported definitions ---------------------
*/
-afs_lock_t afs_xdcache; /*Lock: alloc new disk cache entries */
-afs_int32 afs_freeDCList; /*Free list for disk cache entries */
-afs_int32 afs_freeDCCount; /*Count of elts in freeDCList */
-afs_int32 afs_discardDCList; /*Discarded disk cache entries */
-afs_int32 afs_discardDCCount; /*Count of elts in discardDCList */
-struct dcache *afs_freeDSList; /*Free list for disk slots */
-struct dcache *afs_Initial_freeDSList; /*Initial list for above */
-ino_t cacheInode; /*Inode for CacheItems file */
-struct osi_file *afs_cacheInodep = 0; /* file for CacheItems inode */
-struct afs_q afs_DLRU; /*dcache LRU */
+/* For split cache */
+afs_int32 afs_blocksUsed_0; /*!< 1K blocks in cache - in theory is zero */
+afs_int32 afs_blocksUsed_1; /*!< 1K blocks in cache */
+afs_int32 afs_blocksUsed_2; /*!< 1K blocks in cache */
+afs_int32 afs_pct1 = -1;
+afs_int32 afs_pct2 = -1;
+afs_uint32 afs_tpct1 = 0;
+afs_uint32 afs_tpct2 = 0;
+afs_uint32 splitdcache = 0;
+
+afs_lock_t afs_xdcache; /*!< Lock: alloc new disk cache entries */
+afs_int32 afs_freeDCList; /*!< Free list for disk cache entries */
+afs_int32 afs_freeDCCount; /*!< Count of elts in freeDCList */
+afs_int32 afs_discardDCList; /*!< Discarded disk cache entries */
+afs_int32 afs_discardDCCount; /*!< Count of elts in discardDCList */
+struct dcache *afs_freeDSList; /*!< Free list for disk slots */
+struct dcache *afs_Initial_freeDSList; /*!< Initial list for above */
+#if defined(LINUX_USE_FH)
+struct fid cacheitems_fh;
+int cacheitems_fh_type;
+#else
+ino_t cacheInode; /*!< Inode for CacheItems file */
+#endif
+struct osi_file *afs_cacheInodep = 0; /*!< file for CacheItems inode */
+struct afs_q afs_DLRU; /*!< dcache LRU */
afs_int32 afs_dhashsize = 1024;
-afs_int32 *afs_dvhashTbl; /*Data cache hash table */
-afs_int32 *afs_dchashTbl; /*Data cache hash table */
-afs_int32 *afs_dvnextTbl; /*Dcache hash table links */
-afs_int32 *afs_dcnextTbl; /*Dcache hash table links */
-struct dcache **afs_indexTable; /*Pointers to dcache entries */
-afs_hyper_t *afs_indexTimes; /*Dcache entry Access times */
-afs_int32 *afs_indexUnique; /*dcache entry Fid.Unique */
-unsigned char *afs_indexFlags; /*(only one) Is there data there? */
-afs_hyper_t afs_indexCounter; /*Fake time for marking index
+afs_int32 *afs_dvhashTbl; /*!< Data cache hash table: hashed by FID + chunk number. */
+afs_int32 *afs_dchashTbl; /*!< Data cache hash table: hashed by FID. */
+afs_int32 *afs_dvnextTbl; /*!< Dcache hash table links */
+afs_int32 *afs_dcnextTbl; /*!< Dcache hash table links */
+struct dcache **afs_indexTable; /*!< Pointers to dcache entries */
+afs_hyper_t *afs_indexTimes; /*!< Dcache entry Access times */
+afs_int32 *afs_indexUnique; /*!< dcache entry Fid.Unique */
+unsigned char *afs_indexFlags; /*!< (only one) Is there data there? */
+afs_hyper_t afs_indexCounter; /*!< Fake time for marking index
* entries */
-afs_int32 afs_cacheFiles = 0; /*Size of afs_indexTable */
-afs_int32 afs_cacheBlocks; /*1K blocks in cache */
-afs_int32 afs_cacheStats; /*Stat entries in cache */
-afs_int32 afs_blocksUsed; /*Number of blocks in use */
-afs_int32 afs_blocksDiscarded; /*Blocks freed but not truncated */
-afs_int32 afs_fsfragsize = 1023; /*Underlying Filesystem minimum unit
+afs_int32 afs_cacheFiles = 0; /*!< Size of afs_indexTable */
+afs_int32 afs_cacheBlocks; /*!< 1K blocks in cache */
+afs_int32 afs_cacheStats; /*!< Stat entries in cache */
+afs_int32 afs_blocksUsed; /*!< Number of blocks in use */
+afs_int32 afs_blocksDiscarded; /*!<Blocks freed but not truncated */
+afs_int32 afs_fsfragsize = 1023; /*!< Underlying Filesystem minimum unit
*of disk allocation usually 1K
*this value is (truefrag -1 ) to
*save a bunch of subtracts... */
#ifdef AFS_64BIT_CLIENT
#ifdef AFS_VM_RDWR_ENV
-afs_size_t afs_vmMappingEnd; /* for large files (>= 2GB) the VM
+afs_size_t afs_vmMappingEnd; /* !< For large files (>= 2GB) the VM
* mapping an 32bit addressing machines
* can only be used below the 2 GB
* line. From this point upwards we
int afs_TruncateDaemonRunning = 0;
int afs_CacheTooFull = 0;
-afs_int32 afs_dcentries; /* In-memory dcache entries */
+afs_int32 afs_dcentries; /*!< In-memory dcache entries */
int dcacheDisabled = 0;
-static int afs_UFSCacheFetchProc(), afs_UFSCacheStoreProc();
+static int afs_UFSCacheFetchProc(struct rx_call *, struct osi_file *,
+ afs_size_t, struct dcache *,
+ struct vcache *, afs_size_t *,
+ afs_size_t *, afs_int32);
+
+static int afs_UFSCacheStoreProc(struct rx_call *, struct osi_file *,
+ afs_int32, struct vcache *,
+ int *, afs_size_t *,
+ afs_size_t *);
+
struct afs_cacheOps afs_UfsCacheOps = {
+#if defined(LINUX_USE_FH)
+ osi_UFSOpen_fh,
+#else
osi_UFSOpen,
+#endif
osi_UFSTruncate,
afs_osi_Read,
afs_osi_Write,
int cacheDiskType; /*Type of backing disk for cache */
struct afs_cacheOps *afs_cacheType;
+/*!
+ * Where is this vcache's entry associated dcache located/
+ * \param avc The vcache entry.
+ * \return Bucket index:
+ * 1 : main
+ * 2 : RO
+ */
+static afs_int32
+afs_DCGetBucket(struct vcache *avc)
+{
+ if (!splitdcache)
+ return 1;
+
+ /* This should be replaced with some sort of user configurable function */
+ if (avc->states & CRO) {
+ return 2;
+ } else if (avc->states & CBackup) {
+ return 1;
+ } else {
+ /* RW */
+ }
+ /* main bucket */
+ return 1;
+}
+/*!
+ * Readjust a dcache's size.
+ *
+ * \param adc The dcache to be adjusted.
+ * \param oldSize Old size for the dcache.
+ * \param newSize The new size to be adjusted to.
+ *
+ */
+static void
+afs_DCAdjustSize(struct dcache *adc, afs_int32 oldSize, afs_int32 newSize)
+{
+ afs_int32 adjustSize = newSize - oldSize;
+
+ if (!splitdcache)
+ return;
+ switch (adc->bucket)
+ {
+ case 0:
+ afs_blocksUsed_0 += adjustSize;
+ afs_stats_cmperf.cacheBucket0_Discarded += oldSize;
+ break;
+ case 1:
+ afs_blocksUsed_1 += adjustSize;
+ afs_stats_cmperf.cacheBucket1_Discarded += oldSize;
+ break;
+ case 2:
+ afs_blocksUsed_2 += adjustSize;
+ afs_stats_cmperf.cacheBucket2_Discarded += oldSize;
+ break;
+ }
-/*
- * afs_StoreWarn
+ return;
+}
+
+/*!
+ * Move a dcache from one bucket to another.
+ *
+ * \param adc Operate on this dcache.
+ * \param size Size in bucket (?).
+ * \param newBucket Destination bucket.
*
- * Description:
- * Warn about failing to store a file.
+ */
+static void
+afs_DCMoveBucket(struct dcache *adc, afs_int32 size, afs_int32 newBucket)
+{
+ if (!splitdcache)
+ return;
+
+ /* Substract size from old bucket. */
+ switch (adc->bucket)
+ {
+ case 0:
+ afs_blocksUsed_0 -= size;
+ break;
+ case 1:
+ afs_blocksUsed_1 -= size;
+ break;
+ case 2:
+ afs_blocksUsed_2 -= size;
+ break;
+ }
+
+ /* Set new bucket and increase destination bucket size. */
+ adc->bucket = newBucket;
+
+ switch (adc->bucket)
+ {
+ case 0:
+ afs_blocksUsed_0 += size;
+ break;
+ case 1:
+ afs_blocksUsed_1 += size;
+ break;
+ case 2:
+ afs_blocksUsed_2 += size;
+ break;
+ }
+
+ return;
+}
+
+/*!
+ * Init split caches size.
+ */
+static void
+afs_DCSizeInit(void)
+{
+ afs_blocksUsed_0 = afs_blocksUsed_1 = afs_blocksUsed_2 = 0;
+}
+
+
+/*!
+ * \param phase
+ * \param bucket
+ */
+static afs_int32
+afs_DCWhichBucket(afs_int32 phase, afs_int32 bucket)
+{
+ if (!splitdcache)
+ return 0;
+
+ afs_pct1 = afs_blocksUsed_1 / (afs_cacheBlocks / 100);
+ afs_pct2 = afs_blocksUsed_2 / (afs_cacheBlocks / 100);
+
+ /* Short cut: if we don't know about it, try to kill it */
+ if (phase < 2 && afs_blocksUsed_0)
+ return 0;
+
+ if (afs_pct1 > afs_tpct1)
+ return 1;
+ if (afs_pct2 > afs_tpct2)
+ return 2;
+ return 0; /* unlikely */
+}
+
+
+/*!
+ * Warn about failing to store a file.
*
- * Parameters:
- * acode : Associated error code.
- * avolume : Volume involved.
- * aflags : How to handle the output:
- * aflags & 1: Print out on console
- * aflags & 2: Print out on controlling tty
+ * \param acode Associated error code.
+ * \param avolume Volume involved.
+ * \param aflags How to handle the output:
+ * aflags & 1: Print out on console
+ * aflags & 2: Print out on controlling tty
*
- * Environment:
- * Call this from close call when vnodeops is RCS unlocked.
+ * \note Environment: Call this from close call when vnodeops is RCS unlocked.
*/
void
}
} /*afs_StoreWarn */
+/*!
+ * Try waking up truncation daemon, if it's worth it.
+ */
void
afs_MaybeWakeupTruncateDaemon(void)
{
}
}
-/* Keep statistics on run time for afs_CacheTruncateDaemon. This is a
+/*!
+ * /struct CTD_stats
+ *
+ * Keep statistics on run time for afs_CacheTruncateDaemon. This is a
* struct so we need only export one symbol for AIX.
*/
static struct CTD_stats {
} CTD_stats;
u_int afs_min_cache = 0;
+
+/*!
+ * Keeps the cache clean and free by truncating uneeded files, when used.
+ * \param
+ * \return
+ */
void
afs_CacheTruncateDaemon(void)
{
u_int counter;
u_int cb_lowat;
u_int dc_hiwat =
- (100 - CM_DCACHECOUNTFREEPCT +
- CM_DCACHEEXTRAPCT) * afs_cacheFiles / 100;
+ PERCENT((100 - CM_DCACHECOUNTFREEPCT + CM_DCACHEEXTRAPCT), afs_cacheFiles);
afs_min_cache =
(((10 * AFS_CHUNKSIZE(0)) + afs_fsfragsize) & ~afs_fsfragsize) >> 10;
osi_GetuTime(&CTD_stats.CTD_afterSleep);
afs_TruncateDaemonRunning = 1;
while (1) {
- cb_lowat = ((CM_DCACHESPACEFREEPCT - CM_DCACHEEXTRAPCT)
- * afs_cacheBlocks) / 100;
+ cb_lowat = PERCENT((CM_DCACHESPACEFREEPCT - CM_DCACHEEXTRAPCT), afs_cacheBlocks);
MObtainWriteLock(&afs_xdcache, 266);
if (afs_CacheTooFull) {
int space_needed, slots_needed;
afs_blocksUsed - afs_blocksDiscarded - cb_lowat;
slots_needed =
dc_hiwat - afs_freeDCCount - afs_discardDCCount;
- afs_GetDownD(slots_needed, &space_needed);
+ afs_GetDownD(slots_needed, &space_needed, 0);
if ((space_needed <= 0) && (slots_needed <= 0)) {
break;
}
}
if (!afs_CacheIsTooFull())
afs_CacheTooFull = 0;
- }
+ } /* end of cache cleanup */
MReleaseWriteLock(&afs_xdcache);
/*
}
-/*
- * afs_AdjustSize
+/*!
+ * Make adjustment for the new size in the disk cache entry
*
- * Description:
- * Make adjustment for the new size in the disk cache entry
- *
- * Major Assumptions Here:
+ * \note Major Assumptions Here:
* Assumes that frag size is an integral power of two, less one,
* and that this is a two's complement machine. I don't
* know of any filesystems which violate this assumption...
*
- * Parameters:
- * adc : Ptr to dcache entry.
- * anewsize : New size desired.
+ * \param adc Ptr to dcache entry.
+ * \param anewsize New size desired.
+ *
*/
void
if (!newSize)
adc->validPos = 0;
newSize = ((newSize + afs_fsfragsize) ^ afs_fsfragsize) >> 10; /* round up */
- if (newSize > oldSize) {
+ afs_DCAdjustSize(adc, oldSize, newSize);
+ if ((newSize > oldSize) && !AFS_IS_DISCONNECTED) {
+
/* We're growing the file, wakeup the daemon */
afs_MaybeWakeupTruncateDaemon();
}
}
-/*
- * afs_GetDownD
- *
- * Description:
- * This routine is responsible for moving at least one entry (but up
- * to some number of them) from the LRU queue to the free queue.
+/*!
+ * This routine is responsible for moving at least one entry (but up
+ * to some number of them) from the LRU queue to the free queue.
*
- * Parameters:
- * anumber : Number of entries that should ideally be moved.
- * aneedSpace : How much space we need (1K blocks);
+ * \param anumber Number of entries that should ideally be moved.
+ * \param aneedSpace How much space we need (1K blocks);
*
- * Environment:
+ * \note Environment:
* The anumber parameter is just a hint; at least one entry MUST be
* moved, or we'll panic. We must be called with afs_xdcache
* write-locked. We should try to satisfy both anumber and aneedspace,
* the whole set of MAXATONCE.
* 2. dynamically choose MAXATONCE to reflect severity of
* demand: something like (*aneedSpace >> (logChunk - 9))
- * N.B. if we're called with aneedSpace <= 0 and anumber > 0, that
+ *
+ * \note N.B. if we're called with aneedSpace <= 0 and anumber > 0, that
* indicates that the cache is not properly configured/tuned or
* something. We should be able to automatically correct that problem.
*/
#define MAXATONCE 16 /* max we can obtain at once */
static void
-afs_GetDownD(int anumber, int *aneedSpace)
+afs_GetDownD(int anumber, int *aneedSpace, afs_int32 buckethint)
{
struct dcache *tdc;
afs_hyper_t maxVictimTime; /* youngest (largest LRU time) victim */
afs_uint32 maxVictimPtr; /* where it is */
int discard;
+ int curbucket;
+ int vfslocked;
+
+#if defined(AFS_FBSD80_ENV) && !defined(UKERNEL)
+ vfslocked = VFS_LOCK_GIANT(afs_globalVFS);
+#endif
AFS_STATCNT(afs_GetDownD);
+
if (CheckLock(&afs_xdcache) != -1)
osi_Panic("getdownd nolock");
/* decrement anumber first for all dudes in free list */
* because we should try to free space even if anumber <=0 */
if (!aneedSpace || *aneedSpace <= 0) {
anumber -= afs_freeDCCount;
- if (anumber <= 0)
+ if (anumber <= 0) {
+#if defined(AFS_FBSD80_ENV) && !defined(UKERNEL)
+ VFS_UNLOCK_GIANT(vfslocked);
+#endif
return; /* enough already free */
+ }
}
+
/* bounds check parameter */
if (anumber > MAXATONCE)
anumber = MAXATONCE; /* all we can do */
+ /* rewrite so phases include a better eligiblity for gc test*/
/*
* The phase variable manages reclaims. Set to 0, the first pass,
- * we don't reclaim active entries. Set to 1, we reclaim even active
- * ones.
+ * we don't reclaim active entries, or other than target bucket.
+ * Set to 1, we reclaim even active ones in target bucket.
+ * Set to 2, we reclaim any inactive one.
+ * Set to 3, we reclaim even active ones.
*/
- phase = 0;
+ if (splitdcache) {
+ phase = 0;
+ } else {
+ phase = 4;
+ }
+
for (i = 0; i < afs_cacheFiles; i++)
/* turn off all flags */
afs_indexFlags[i] &= ~IFFlag;
/* find oldest entries for reclamation */
maxVictimPtr = victimPtr = 0;
hzero(maxVictimTime);
+ curbucket = afs_DCWhichBucket(phase, buckethint);
/* select victims from access time array */
for (i = 0; i < afs_cacheFiles; i++) {
if (afs_indexFlags[i] & (IFDataMod | IFFree | IFDiscarded)) {
continue;
}
tdc = afs_indexTable[i];
+ if (tdc && (curbucket != tdc->bucket) && (phase < 4))
+ {
+ /* Wrong bucket; can't use it! */
+ continue;
+ }
if (tdc && (tdc->refCount != 0)) {
/* Referenced; can't use it! */
continue;
if (tvc) {
tchunkoffset = AFS_CHUNKTOBASE(tdc->f.chunk);
chunkFlags = afs_indexFlags[tdc->index];
- if (phase == 0 && osi_Active(tvc))
- skip = 1;
- if (phase > 0 && osi_Active(tvc)
- && (tvc->states & CDCLock)
- && (chunkFlags & IFAnyPages))
- skip = 1;
+ if (((phase & 1) == 0) && osi_Active(tvc))
+ skip = 1;
+ if (((phase & 1) == 1) && osi_Active(tvc)
+ && (tvc->states & CDCLock)
+ && (chunkFlags & IFAnyPages))
+ skip = 1;
if (chunkFlags & IFDataMod)
skip = 1;
afs_Trace4(afs_iclSetp, CM_TRACE_GETDOWND,
MReleaseWriteLock(&afs_xdcache);
}
- AFS_FAST_RELE(tvc);
+ afs_PutVCache(tvc); /*XXX was AFS_FAST_RELE?*/
MObtainWriteLock(&afs_xdcache, 528);
if (afs_indexFlags[tdc->index] &
(IFDataMod | IFDirtyPages | IFAnyPages))
ICL_TYPE_INT32, tdc->index, ICL_TYPE_OFFSET,
ICL_HANDLE_OFFSET(tchunkoffset));
AFS_STATCNT(afs_gget);
- afs_HashOutDCache(tdc);
+ afs_HashOutDCache(tdc, 1);
if (tdc->f.chunkBytes != 0) {
discard = 1;
if (aneedSpace)
}
}
afs_PutDCache(tdc);
- }
+ } /* end of for victims loop */
- if (phase == 0) {
+ if (phase < 5) {
/* Phase is 0 and no one was found, so try phase 1 (ignore
* osi_Active flag) */
if (j == 0) {
- phase = 1;
+ phase++;
for (i = 0; i < afs_cacheFiles; i++)
/* turn off all flags */
afs_indexFlags[i] &= ~IFFlag;
}
} else {
- /* found no one in phase 1, we're hosed */
+ /* found no one in phases 0-5, we're hosed */
if (victimPtr == 0)
break;
}
} /* big while loop */
+
+#if defined(AFS_FBSD80_ENV) && !defined(UKERNEL)
+ VFS_UNLOCK_GIANT(vfslocked);
+#endif
+
return;
} /*afs_GetDownD */
-/*
- * Description: remove adc from any hash tables that would allow it to be located
+/*!
+ * Remove adc from any hash tables that would allow it to be located
* again by afs_FindDCache or afs_GetDCache.
*
- * Parameters: adc -- pointer to dcache entry to remove from hash tables.
+ * \param adc Pointer to dcache entry to remove from hash tables.
+ *
+ * \note Locks: Must have the afs_xdcache lock write-locked to call this function.
*
- * Locks: Must have the afs_xdcache lock write-locked to call this function.
*/
int
-afs_HashOutDCache(struct dcache *adc)
+afs_HashOutDCache(struct dcache *adc, int zap)
{
int i, us;
AFS_STATCNT(afs_glink);
- /* we know this guy's in the LRUQ. We'll move dude into DCQ below */
- DZap(adc);
+ if (zap)
+ /* we know this guy's in the LRUQ. We'll move dude into DCQ below */
+ DZap(adc);
/* if this guy is in the hash table, pull him out */
if (adc->f.fid.Fid.Volume != 0) {
/* remove entry from first hash chains */
}
}
- /* prevent entry from being found on a reboot (it is already out of
- * the hash table, but after a crash, we just look at fid fields of
- * stable (old) entries).
- */
- adc->f.fid.Fid.Volume = 0; /* invalid */
+ if (zap) {
+ /* prevent entry from being found on a reboot (it is already out of
+ * the hash table, but after a crash, we just look at fid fields of
+ * stable (old) entries).
+ */
+ adc->f.fid.Fid.Volume = 0; /* invalid */
- /* mark entry as modified */
- adc->dflags |= DFEntryMod;
+ /* mark entry as modified */
+ adc->dflags |= DFEntryMod;
+ }
/* all done */
return 0;
} /*afs_HashOutDCache */
-
-/*
- * afs_FlushDCache
+/*!
+ * Flush the given dcache entry, pulling it from hash chains
+ * and truncating the associated cache file.
*
- * Description:
- * Flush the given dcache entry, pulling it from hash chains
- * and truncating the associated cache file.
- *
- * Arguments:
- * adc: Ptr to dcache entry to flush.
+ * \param adc Ptr to dcache entry to flush.
*
- * Environment:
+ * \note Environment:
* This routine must be called with the afs_xdcache lock held
- * (in write mode)
+ * (in write mode).
*/
-
void
afs_FlushDCache(register struct dcache *adc)
{
afs_stats_cmperf.cacheFlushes++;
/* remove from all hash tables */
- afs_HashOutDCache(adc);
+ afs_HashOutDCache(adc, 1);
/* Free its space; special case null operation, since truncate operation
* in UFS is slow even in this case, and this allows us to pre-truncate
if (afs_WaitForCacheDrain) {
if (afs_blocksUsed <=
- (CM_CACHESIZEDRAINEDPCT * afs_cacheBlocks) / 100) {
+ PERCENT(CM_CACHESIZEDRAINEDPCT, afs_cacheBlocks)) {
afs_WaitForCacheDrain = 0;
afs_osi_Wakeup(&afs_WaitForCacheDrain);
}
} /*afs_FlushDCache */
-/*
- * afs_FreeDCache
+/*!
+ * Put a dcache entry on the free dcache entry list.
*
- * Description: put a dcache entry on the free dcache entry list.
+ * \param adc dcache entry to free.
*
- * Parameters: adc -- dcache entry to free
- *
- * Environment: called with afs_xdcache lock write-locked.
+ * \note Environment: called with afs_xdcache lock write-locked.
*/
static void
afs_FreeDCache(register struct dcache *adc)
if (afs_WaitForCacheDrain) {
if ((afs_blocksUsed - afs_blocksDiscarded) <=
- (CM_CACHESIZEDRAINEDPCT * afs_cacheBlocks) / 100) {
+ PERCENT(CM_CACHESIZEDRAINEDPCT, afs_cacheBlocks)) {
afs_WaitForCacheDrain = 0;
afs_osi_Wakeup(&afs_WaitForCacheDrain);
}
}
-}
+} /* afs_FreeDCache */
-/*
- * afs_DiscardDCache
- *
- * Description:
- * Discard the cache element by moving it to the discardDCList.
- * This puts the cache element into a quasi-freed state, where
- * the space may be reused, but the file has not been truncated.
+/*!
+ * Discard the cache element by moving it to the discardDCList.
+ * This puts the cache element into a quasi-freed state, where
+ * the space may be reused, but the file has not been truncated.
*
- * Major Assumptions Here:
+ * \note Major Assumptions Here:
* Assumes that frag size is an integral power of two, less one,
* and that this is a two's complement machine. I don't
* know of any filesystems which violate this assumption...
*
- * Parameters:
- * adc : Ptr to dcache entry.
+ * \param adr Ptr to dcache entry.
*
- * Environment:
+ * \note Environment:
* Must be called with afs_xdcache write-locked.
*/
if (afs_WaitForCacheDrain) {
if ((afs_blocksUsed - afs_blocksDiscarded) <=
- (CM_CACHESIZEDRAINEDPCT * afs_cacheBlocks) / 100) {
+ PERCENT(CM_CACHESIZEDRAINEDPCT, afs_cacheBlocks)) {
afs_WaitForCacheDrain = 0;
afs_osi_Wakeup(&afs_WaitForCacheDrain);
}
} /*afs_DiscardDCache */
-/*
- * afs_FreeDiscardedDCache
- *
- * Description:
- * Free the next element on the list of discarded cache elements.
+/*!
+ * Free the next element on the list of discarded cache elements.
*/
static void
afs_FreeDiscardedDCache(void)
/*
* Truncate the element to reclaim its space
*/
+#if defined(LINUX_USE_FH)
+ tfile = afs_CFileOpen(&tdc->f.fh, tdc->f.fh_type);
+#else
tfile = afs_CFileOpen(tdc->f.inode);
+#endif
afs_CFileTruncate(tfile, 0);
afs_CFileClose(tfile);
afs_AdjustSize(tdc, 0);
+ afs_DCMoveBucket(tdc, 0, 0);
/*
* Free the element we just truncated
MObtainWriteLock(&afs_xdcache, 511);
afs_indexFlags[tdc->index] &= ~IFDiscarded;
afs_FreeDCache(tdc);
+ tdc->f.states &= ~(DRO|DBackup|DRW);
ReleaseWriteLock(&tdc->lock);
afs_PutDCache(tdc);
MReleaseWriteLock(&afs_xdcache);
}
-/*
- * afs_MaybeFreeDiscardedDCache
- *
- * Description:
- * Free as many entries from the list of discarded cache elements
- * as we need to get the free space down below CM_WAITFORDRAINPCT (98%).
+/*!
+ * Free as many entries from the list of discarded cache elements
+ * as we need to get the free space down below CM_WAITFORDRAINPCT (98%).
*
- * Parameters:
- * None
+ * \return 0
*/
int
afs_MaybeFreeDiscardedDCache(void)
while (afs_blocksDiscarded
&& (afs_blocksUsed >
- (CM_WAITFORDRAINPCT * afs_cacheBlocks) / 100)) {
+ PERCENT(CM_WAITFORDRAINPCT, afs_cacheBlocks))) {
afs_FreeDiscardedDCache();
}
return 0;
}
-/*
- * afs_GetDownDSlot
+/*!
+ * Try to free up a certain number of disk slots.
*
- * Description:
- * Try to free up a certain number of disk slots.
- *
- * Parameters:
- * anumber : Targeted number of disk slots to free up.
+ * \param anumber Targeted number of disk slots to free up.
*
- * Environment:
+ * \note Environment:
* Must be called with afs_xdcache write-locked.
+ *
*/
static void
afs_GetDownDSlot(int anumber)
#endif
}
- tdc->stamp = 0;
-#ifdef IHINT
- if (tdc->ihint) {
- struct osi_file *f = (struct osi_file *)tdc->ihint;
- tdc->ihint = 0;
- afs_UFSClose(f);
- nihints--;
- }
-#endif /* IHINT */
-
-
/* finally put the entry in the free list */
afs_indexTable[ix] = NULL;
afs_indexFlags[ix] &= ~IFEverUsed;
#endif
MReleaseWriteLock(&afs_xdcache);
/*
- * It's treated like a callback so that when we do lookups we'll invalidate the unique bit if any
+ * It's treated like a callback so that when we do lookups we'll
+ * invalidate the unique bit if any
* trytoSmush occured during the lookup call
*/
afs_allCBs++;
}
/*
+ * afs_DCacheMissingChunks
+ *
+ * Description
+ * Given the cached info for a file, return the number of chunks that
+ * are not available from the dcache.
+ *
+ * Parameters:
+ * avc: Pointer to the (held) vcache entry to look in.
+ *
+ * Returns:
+ * The number of chunks which are not currently cached.
+ *
+ * Environment:
+ * The vcache entry is held upon entry.
+ */
+
+int
+afs_DCacheMissingChunks(struct vcache *avc)
+{
+ int i, index;
+ afs_size_t totalLength = 0;
+ afs_uint32 totalChunks = 0;
+ struct dcache *tdc;
+
+ totalLength = avc->m.Length;
+ if (avc->truncPos < totalLength)
+ totalLength = avc->truncPos;
+
+ /* Length is 0, no chunk missing. */
+ if (totalLength == 0)
+ return 0;
+
+ /* If totalLength is a multiple of chunksize, the last byte appears
+ * as being part of the next chunk, which does not exist.
+ * Decrementing totalLength by one fixes that.
+ */
+ totalLength--;
+ totalChunks = (AFS_CHUNK(totalLength) + 1);
+
+ /*
+ printf("Should have %d chunks for %u bytes\n",
+ totalChunks, (totalLength + 1));
+ */
+ i = DVHash(&avc->fid);
+ MObtainWriteLock(&afs_xdcache, 1001);
+ for (index = afs_dvhashTbl[i]; index != NULLIDX; index = i) {
+ i = afs_dvnextTbl[index];
+ if (afs_indexUnique[index] == avc->fid.Fid.Unique) {
+ tdc = afs_GetDSlot(index, NULL);
+ if (!FidCmp(&tdc->f.fid, &avc->fid)) {
+ totalChunks--;
+ }
+ ReleaseReadLock(&tdc->tlock);
+ afs_PutDCache(tdc);
+ }
+ }
+ MReleaseWriteLock(&afs_xdcache);
+
+ /*printf("Missing %d chunks\n", totalChunks);*/
+
+ return (totalChunks);
+}
+
+/*
* afs_FindDCache
*
* Description:
}
index = afs_dcnextTbl[index];
}
- MReleaseWriteLock(&afs_xdcache);
if (index != NULLIDX) {
hset(afs_indexTimes[tdc->index], afs_indexCounter);
hadd32(afs_indexCounter, 1);
+ MReleaseWriteLock(&afs_xdcache);
return tdc;
- } else
- return NULL;
-
+ }
+ MReleaseWriteLock(&afs_xdcache);
+ return NULL;
} /*afs_FindDCache */
} /* afs_UFSCacheFetchProc */
+/*!
+ * Get a fresh dcache from the free or discarded list.
+ *
+ * \param avc Who's dcache is this going to be?
+ * \param chunk The position where it will be placed in.
+ * \param lock How are locks held.
+ * \param ashFid If this dcache going to be used for a shadow dir,
+ * this is it's fid.
+ *
+ * \note Required locks:
+ * - afs_xdcache (W)
+ * - avc (R if (lock & 1) set and W otherwise)
+ * \note It write locks the new dcache. The caller must unlock it.
+ *
+ * \return The new dcache.
+ */
+struct dcache *afs_AllocDCache(struct vcache *avc,
+ afs_int32 chunk,
+ afs_int32 lock,
+ struct VenusFid *ashFid)
+{
+ struct dcache *tdc = NULL;
+ afs_uint32 size = 0;
+ struct osi_file *file;
+
+ if (afs_discardDCList == NULLIDX
+ || ((lock & 2) && afs_freeDCList != NULLIDX)) {
+
+ afs_indexFlags[afs_freeDCList] &= ~IFFree;
+ tdc = afs_GetDSlot(afs_freeDCList, 0);
+ osi_Assert(tdc->refCount == 1);
+ ReleaseReadLock(&tdc->tlock);
+ ObtainWriteLock(&tdc->lock, 604);
+ afs_freeDCList = afs_dvnextTbl[tdc->index];
+ afs_freeDCCount--;
+ } else {
+ afs_indexFlags[afs_discardDCList] &= ~IFDiscarded;
+ tdc = afs_GetDSlot(afs_discardDCList, 0);
+ osi_Assert(tdc->refCount == 1);
+ ReleaseReadLock(&tdc->tlock);
+ ObtainWriteLock(&tdc->lock, 605);
+ afs_discardDCList = afs_dvnextTbl[tdc->index];
+ afs_discardDCCount--;
+ size =
+ ((tdc->f.chunkBytes +
+ afs_fsfragsize) ^ afs_fsfragsize) >> 10;
+ tdc->f.states &= ~(DRO|DBackup|DRW);
+ afs_DCMoveBucket(tdc, size, 0);
+ afs_blocksDiscarded -= size;
+ afs_stats_cmperf.cacheBlocksDiscarded = afs_blocksDiscarded;
+ if (lock & 2) {
+ /* Truncate the chunk so zeroes get filled properly */
+#if defined(LINUX_USE_FH)
+ file = afs_CFileOpen(&tdc->f.fh, tdc->f.fh_type);
+#else
+ file = afs_CFileOpen(tdc->f.inode);
+#endif
+ afs_CFileTruncate(file, 0);
+ afs_CFileClose(file);
+ afs_AdjustSize(tdc, 0);
+ }
+ }
+
+ /*
+ * Locks held:
+ * avc->lock(R) if setLocks
+ * avc->lock(W) if !setLocks
+ * tdc->lock(W)
+ * afs_xdcache(W)
+ */
+
+ /*
+ * Fill in the newly-allocated dcache record.
+ */
+ afs_indexFlags[tdc->index] &= ~(IFDirtyPages | IFAnyPages);
+ if (ashFid)
+ /* Use shadow fid if provided. */
+ tdc->f.fid = *ashFid;
+ else
+ /* Use normal vcache's fid otherwise. */
+ tdc->f.fid = avc->fid;
+ if (avc->states & CRO)
+ tdc->f.states = DRO;
+ else if (avc->states & CBackup)
+ tdc->f.states = DBackup;
+ else
+ tdc->f.states = DRW;
+ afs_DCMoveBucket(tdc, 0, afs_DCGetBucket(avc));
+ afs_indexUnique[tdc->index] = tdc->f.fid.Fid.Unique;
+ if (!ashFid)
+ hones(tdc->f.versionNo); /* invalid value */
+ tdc->f.chunk = chunk;
+ tdc->validPos = AFS_CHUNKTOBASE(chunk);
+ /* XXX */
+ if (tdc->lruq.prev == &tdc->lruq)
+ osi_Panic("lruq 1");
+
+ return tdc;
+}
+
/*
* afs_GetDCache
*
updateV2DC(int lockVc, struct vcache *v, struct dcache *d, int src)
{
if (!lockVc || 0 == NBObtainWriteLock(&v->lock, src)) {
- if (hsame(v->m.DataVersion, d->f.versionNo) && v->callback) {
- v->quick.dc = d;
- v->quick.stamp = d->stamp = MakeStamp();
- v->quick.minLoc = AFS_CHUNKTOBASE(d->f.chunk);
- /* Don't think I need these next two lines forever */
- v->quick.len = d->f.chunkBytes;
- v->h1.dchint = d;
- }
+ if (hsame(v->m.DataVersion, d->f.versionNo) && v->callback)
+ v->dchint = d;
if (lockVc)
ReleaseWriteLock(&v->lock);
}
#endif /* AFS_NOSTATS */
AFS_STATCNT(afs_GetDCache);
-
if (dcacheDisabled)
return NULL;
shortcut = 0;
/* check hints first! (might could use bcmp or some such...) */
- if ((tdc = avc->h1.dchint)) {
+ if ((tdc = avc->dchint)) {
int dcLocked;
/*
while (1) {
if (!setLocks)
avc->states |= CDCLock;
- afs_GetDownD(5, (int *)0); /* just need slots */
+ /* just need slots */
+ afs_GetDownD(5, (int *)0, afs_DCGetBucket(avc));
if (!setLocks)
avc->states &= ~CDCLock;
if (afs_discardDCList != NULLIDX
|| afs_freeDCList != NULLIDX)
break;
/* If we can't get space for 5 mins we give up and panic */
- if (++downDCount > 300)
+ if (++downDCount > 300) {
+#if defined(AFS_CACHE_BYPASS)
+ afs_warn("GetDCache calling osi_Panic: No space in five minutes.\n downDCount: %d\n aoffset: %d alen: %d\n", downDCount, aoffset, alen);
+#endif
osi_Panic("getdcache");
+ }
MReleaseWriteLock(&afs_xdcache);
/*
* Locks held:
}
}
- if (afs_discardDCList == NULLIDX
- || ((aflags & 2) && afs_freeDCList != NULLIDX)) {
-
- afs_indexFlags[afs_freeDCList] &= ~IFFree;
- tdc = afs_GetDSlot(afs_freeDCList, 0);
- osi_Assert(tdc->refCount == 1);
- ReleaseReadLock(&tdc->tlock);
- ObtainWriteLock(&tdc->lock, 604);
- afs_freeDCList = afs_dvnextTbl[tdc->index];
- afs_freeDCCount--;
- } else {
- afs_indexFlags[afs_discardDCList] &= ~IFDiscarded;
- tdc = afs_GetDSlot(afs_discardDCList, 0);
- osi_Assert(tdc->refCount == 1);
- ReleaseReadLock(&tdc->tlock);
- ObtainWriteLock(&tdc->lock, 605);
- afs_discardDCList = afs_dvnextTbl[tdc->index];
- afs_discardDCCount--;
- size =
- ((tdc->f.chunkBytes +
- afs_fsfragsize) ^ afs_fsfragsize) >> 10;
- afs_blocksDiscarded -= size;
- afs_stats_cmperf.cacheBlocksDiscarded = afs_blocksDiscarded;
- if (aflags & 2) {
- /* Truncate the chunk so zeroes get filled properly */
- file = afs_CFileOpen(tdc->f.inode);
- afs_CFileTruncate(file, 0);
- afs_CFileClose(file);
- afs_AdjustSize(tdc, 0);
- }
- }
-
- /*
- * Locks held:
- * avc->lock(R) if setLocks
- * avc->lock(W) if !setLocks
- * tdc->lock(W)
- * afs_xdcache(W)
- */
-
- /*
- * Fill in the newly-allocated dcache record.
- */
- afs_indexFlags[tdc->index] &= ~(IFDirtyPages | IFAnyPages);
- tdc->f.fid = avc->fid;
- afs_indexUnique[tdc->index] = tdc->f.fid.Fid.Unique;
- hones(tdc->f.versionNo); /* invalid value */
- tdc->f.chunk = chunk;
- tdc->validPos = AFS_CHUNKTOBASE(chunk);
- /* XXX */
- if (tdc->lruq.prev == &tdc->lruq)
- osi_Panic("lruq 1");
+ tdc = afs_AllocDCache(avc, chunk, aflags, NULL);
/*
* Now add to the two hash chains - note that i is still set
afs_dvhashTbl[i] = tdc->index;
tdc->dflags = DFEntryMod;
tdc->mflags = 0;
- tdc->f.states = 0;
afs_MaybeWakeupTruncateDaemon();
MReleaseWriteLock(&afs_xdcache);
ConvertWToSLock(&tdc->lock);
ICL_HANDLE_OFFSET(Position));
if ((aflags & 4) && (hiszero(avc->m.DataVersion)))
doAdjustSize = 1;
- if ((aflags & 4) && (abyte == Position) && (tlen >= size))
+ if ((AFS_CHUNKTOBASE(chunk) >= avc->m.Length) ||
+ ((aflags & 4) && (abyte == Position) && (tlen >= size)))
overWriteWholeChunk = 1;
if (doAdjustSize || overWriteWholeChunk) {
#if defined(AFS_AIX32_ENV) || defined(AFS_SGI_ENV)
/* no data in file to read at this position */
UpgradeSToWLock(&tdc->lock, 607);
+#if defined(LINUX_USE_FH)
+ file = afs_CFileOpen(&tdc->f.fh, tdc->f.fh_type);
+#else
file = afs_CFileOpen(tdc->f.inode);
+#endif
afs_CFileTruncate(file, 0);
afs_CFileClose(file);
afs_AdjustSize(tdc, 0);
/*
* Version number mismatch.
*/
+ /*
+ * If we are disconnected, then we can't do much of anything
+ * because the data doesn't match the file.
+ */
+ if (AFS_IS_DISCONNECTED) {
+ ReleaseSharedLock(&tdc->lock);
+ if (setLocks) {
+ if (slowPass)
+ ReleaseWriteLock(&avc->lock);
+ else
+ ReleaseReadLock(&avc->lock);
+ }
+ /* Flush the Dcache */
+ afs_PutDCache(tdc);
+
+ return NULL;
+ }
UpgradeSToWLock(&tdc->lock, 609);
/*
/* Sleep here when cache needs to be drained. */
if (setLocks && !slowPass
&& (afs_blocksUsed >
- (CM_WAITFORDRAINPCT * afs_cacheBlocks) / 100)) {
+ PERCENT(CM_WAITFORDRAINPCT, afs_cacheBlocks))) {
/* Make sure truncate daemon is running */
afs_MaybeWakeupTruncateDaemon();
ObtainWriteLock(&tdc->tlock, 614);
ReleaseWriteLock(&tdc->lock);
ReleaseReadLock(&avc->lock);
while ((afs_blocksUsed - afs_blocksDiscarded) >
- (CM_WAITFORDRAINPCT * afs_cacheBlocks) / 100) {
+ PERCENT(CM_WAITFORDRAINPCT, afs_cacheBlocks)) {
afs_WaitForCacheDrain = 1;
afs_osi_Sleep(&afs_WaitForCacheDrain);
}
* fetch the whole file.
*/
DZap(tdc); /* pages in cache may be old */
-#ifdef IHINT
- if (file = tdc->ihint) {
- if (tdc->f.inode == file->inum)
- usedihint++;
- else {
- tdc->ihint = 0;
- afs_UFSClose(file);
- file = 0;
- nihints--;
- file = osi_UFSOpen(tdc->f.inode);
- }
- } else
-#endif /* IHINT */
- file = afs_CFileOpen(tdc->f.inode);
+#if defined(LINUX_USE_FH)
+ file = afs_CFileOpen(&tdc->f.fh, tdc->f.fh_type);
+#else
+ file = afs_CFileOpen(tdc->f.inode);
+#endif
afs_RemoveVCB(&avc->fid);
tdc->f.states |= DWriting;
tdc->dflags |= DFFetching;
tdc->validPos = Position + size;
afs_CFileTruncate(file, size); /* prune it */
+ } else if (afs_IsDynrootMount(avc)) {
+ char *dynrootDir;
+ int dynrootLen;
+
+ afs_GetDynrootMount(&dynrootDir, &dynrootLen, &tsmall->OutStatus);
+
+ dynrootDir += Position;
+ dynrootLen -= Position;
+ if (size > dynrootLen)
+ size = dynrootLen;
+ if (size < 0)
+ size = 0;
+ code = afs_CFileWrite(file, 0, dynrootDir, size);
+ afs_PutDynroot();
+
+ if (code == size)
+ code = 0;
+ else
+ code = -1;
+
+ tdc->validPos = Position + size;
+ afs_CFileTruncate(file, size); /* prune it */
} else
/*
* Not a dynamic vnode: do the real fetch.
if (vType(avc) == VDIR) {
DZap(tdc);
}
+ tdc->f.states &= ~(DRO|DBackup|DRW);
+ afs_DCMoveBucket(tdc, 0, 0);
ReleaseWriteLock(&tdc->lock);
afs_PutDCache(tdc);
- ObtainWriteLock(&afs_xcbhash, 454);
- afs_DequeueCallback(avc);
- avc->states &= ~(CStatd | CUnique);
- ReleaseWriteLock(&afs_xcbhash);
- if (avc->fid.Fid.Vnode & 1 || (vType(avc) == VDIR))
- osi_dnlc_purgedp(avc);
- /*
- * Locks held:
- * avc->lock(W); assert(!setLocks || slowPass)
- */
- osi_Assert(!setLocks || slowPass);
+ if (!afs_IsDynroot(avc)) {
+ ObtainWriteLock(&afs_xcbhash, 454);
+ afs_DequeueCallback(avc);
+ avc->states &= ~(CStatd | CUnique);
+ ReleaseWriteLock(&afs_xcbhash);
+ if (avc->fid.Fid.Vnode & 1 || (vType(avc) == VDIR))
+ osi_dnlc_purgedp(avc);
+ /*
+ * Locks held:
+ * avc->lock(W); assert(!setLocks || slowPass)
+ */
+ osi_Assert(!setLocks || slowPass);
+ }
+ tdc->f.states &= ~(DRO|DBackup|DRW);
+ afs_DCMoveBucket(tdc, 0, 0);
tdc = NULL;
goto done;
}
if (CheckLock(&afs_xdcache) != -1)
osi_Panic("getdslot nolock");
if (aslot < 0 || aslot >= afs_cacheFiles)
- osi_Panic("getdslot slot");
+ osi_Panic("getdslot slot %d (of %d)", aslot, afs_cacheFiles);
tdc = afs_indexTable[aslot];
if (tdc) {
QRemove(&tdc->lruq); /* move to queue head */
osi_Assert(0 == NBObtainWriteLock(&tdc->tlock, 676));
}
- RWLOCK_INIT(&tdc->lock, "dcache lock");
- RWLOCK_INIT(&tdc->tlock, "dcache tlock");
- RWLOCK_INIT(&tdc->mflock, "dcache flock");
+ AFS_RWLOCK_INIT(&tdc->lock, "dcache lock");
+ AFS_RWLOCK_INIT(&tdc->tlock, "dcache tlock");
+ AFS_RWLOCK_INIT(&tdc->mflock, "dcache flock");
ObtainReadLock(&tdc->tlock);
if (tmpdc == NULL)
if (CheckLock(&afs_xdcache) != -1)
osi_Panic("getdslot nolock");
if (aslot < 0 || aslot >= afs_cacheFiles)
- osi_Panic("getdslot slot");
+ osi_Panic("getdslot slot %d (of %d)", aslot, afs_cacheFiles);
tdc = afs_indexTable[aslot];
if (tdc) {
QRemove(&tdc->lruq); /* move to queue head */
} else {
tdc = tmpdc;
tdc->f.states = 0;
- tdc->ihint = 0;
}
/*
#endif
lasterrtime = osi_Time();
afs_indexUnique[aslot] = tdc->f.fid.Fid.Unique;
+ tdc->f.states &= ~(DRO|DBackup|DRW);
+ afs_DCMoveBucket(tdc, 0, 0);
+ } else {
+ if (&tdc->f != 0) {
+ if (tdc->f.states & DRO) {
+ afs_DCMoveBucket(tdc, 0, 2);
+ } else if (tdc->f.states & DBackup) {
+ afs_DCMoveBucket(tdc, 0, 1);
+ } else {
+ afs_DCMoveBucket(tdc, 0, 1);
+ }
+ }
}
tdc->refCount = 1;
tdc->index = aslot;
osi_Assert(0 == NBObtainWriteLock(&tdc->tlock, 676));
}
- RWLOCK_INIT(&tdc->lock, "dcache lock");
- RWLOCK_INIT(&tdc->tlock, "dcache tlock");
- RWLOCK_INIT(&tdc->mflock, "dcache flock");
+ AFS_RWLOCK_INIT(&tdc->lock, "dcache lock");
+ AFS_RWLOCK_INIT(&tdc->tlock, "dcache tlock");
+ AFS_RWLOCK_INIT(&tdc->mflock, "dcache flock");
ObtainReadLock(&tdc->tlock);
/*
-/*
- * afs_WriteDCache
- *
- * Description:
- * write a particular dcache entry back to its home in the
- * CacheInfo file.
+/*!
+ * Write a particular dcache entry back to its home in the
+ * CacheInfo file.
*
- * Parameters:
- * adc : Pointer to the dcache entry to write.
- * atime : If true, set the modtime on the file to the current time.
+ * \param adc Pointer to the dcache entry to write.
+ * \param atime If true, set the modtime on the file to the current time.
*
- * Environment:
+ * \note Environment:
* Must be called with the afs_xdcache lock at least read-locked,
* and dcache entry at least read-locked.
* The reference count is not changed.
if (cacheDiskType == AFS_FCACHE_TYPE_MEM)
return 0;
AFS_STATCNT(afs_WriteDCache);
+ osi_Assert(WriteLocked(&afs_xdcache));
if (atime)
adc->f.modTime = osi_Time();
/*
-/*
- * afs_wakeup
- *
- * Description:
- * Wake up users of a particular file waiting for stores to take
- * place.
+/*!
+ * Wake up users of a particular file waiting for stores to take
+ * place.
*
- * Parameters:
- * avc : Ptr to related vcache entry.
+ * \param avc Ptr to related vcache entry.
*
- * Environment:
+ * \note Environment:
* Nothing interesting.
*/
-
int
afs_wakeup(register struct vcache *avc)
{
}
-/*
- * afs_InitCacheFile
+/*!
+ * Given a file name and inode, set up that file to be an
+ * active member in the AFS cache. This also involves checking
+ * the usability of its data.
*
- * Description:
- * Given a file name and inode, set up that file to be an
- * active member in the AFS cache. This also involves checking
- * the usability of its data.
+ * \param afile Name of the cache file to initialize.
+ * \param ainode Inode of the file.
*
- * Parameters:
- * afile : Name of the cache file to initialize.
- * ainode : Inode of the file.
- *
- * Environment:
+ * \note Environment:
* This function is called only during initialization.
*/
-
int
afs_InitCacheFile(char *afile, ino_t ainode)
{
struct osi_file *tfile;
struct osi_stat tstat;
register struct dcache *tdc;
+#if defined(LINUX_USE_FH)
+ int max_len = sizeof(struct fid);
+#endif
AFS_STATCNT(afs_InitCacheFile);
index = afs_stats_cmperf.cacheNumEntries;
* UFS file system, and just record the inode number.
*/
#ifdef AFS_LINUX22_ENV
- tdc->f.inode = VTOI(filevp->d_inode)->i_number;
+#if defined(LINUX_USE_FH)
+ tdc->f.fh_type = osi_get_fh(filevp, &tdc->f.fh, &max_len);
+#else
+ tdc->f.inode = VTOI(filevp->d_inode)->i_number;
dput(filevp);
+#endif
#else
tdc->f.inode = afs_vnodeToInumber(filevp);
AFS_RELE(filevp);
fileIsBad = 0;
if ((tdc->f.states & DWriting) || tdc->f.fid.Fid.Volume == 0)
fileIsBad = 1;
+#if defined(LINUX_USE_FH)
+ tfile = osi_UFSOpen_fh(&tdc->f.fh, tdc->f.fh_type);
+#else
tfile = osi_UFSOpen(tdc->f.inode);
+#endif
code = afs_osi_Stat(tfile, &tstat);
if (code)
osi_Panic("initcachefile stat");
tdc->f.fid.Fid.Volume = 0; /* not in the hash table */
if (tstat.size != 0)
osi_UFSTruncate(tfile, 0);
+ tdc->f.states &= ~(DRO|DBackup|DRW);
+ afs_DCMoveBucket(tdc, 0, 0);
/* put entry in free cache slot list */
afs_dvnextTbl[tdc->index] = afs_freeDCList;
afs_freeDCList = index;
*/
#define DDSIZE 200
-/*
- * afs_dcacheInit
+/*!
+ * Initialize dcache related variables.
+ *
+ * \param afiles
+ * \param ablocks
+ * \param aDentries
+ * \param achunk
+ * \param aflags
*
- * Description:
- * Initialize dcache related variables.
*/
void
afs_dcacheInit(int afiles, int ablocks, int aDentries, int achunk, int aflags)
afs_freeDSList = &tdp[0];
for (i = 0; i < aDentries - 1; i++) {
tdp[i].lruq.next = (struct afs_q *)(&tdp[i + 1]);
- RWLOCK_INIT(&tdp[i].lock, "dcache lock");
- RWLOCK_INIT(&tdp[i].tlock, "dcache tlock");
- RWLOCK_INIT(&tdp[i].mflock, "dcache flock");
+ AFS_RWLOCK_INIT(&tdp[i].lock, "dcache lock");
+ AFS_RWLOCK_INIT(&tdp[i].tlock, "dcache tlock");
+ AFS_RWLOCK_INIT(&tdp[i].mflock, "dcache flock");
}
tdp[aDentries - 1].lruq.next = (struct afs_q *)0;
- RWLOCK_INIT(&tdp[aDentries - 1].lock, "dcache lock");
- RWLOCK_INIT(&tdp[aDentries - 1].tlock, "dcache tlock");
- RWLOCK_INIT(&tdp[aDentries - 1].mflock, "dcache flock");
+ AFS_RWLOCK_INIT(&tdp[aDentries - 1].lock, "dcache lock");
+ AFS_RWLOCK_INIT(&tdp[aDentries - 1].tlock, "dcache tlock");
+ AFS_RWLOCK_INIT(&tdp[aDentries - 1].mflock, "dcache flock");
afs_stats_cmperf.cacheBlocksOrig = afs_stats_cmperf.cacheBlocksTotal =
afs_cacheBlocks = ablocks;
afs_dcentries = aDentries;
afs_blocksUsed = 0;
+ afs_stats_cmperf.cacheBucket0_Discarded =
+ afs_stats_cmperf.cacheBucket1_Discarded =
+ afs_stats_cmperf.cacheBucket2_Discarded = 0;
+ afs_DCSizeInit();
QInit(&afs_DLRU);
}
-/*
- * shutdown_dcache
+/*!
+ * Shuts down the cache.
*
*/
void
afs_osi_Free(afs_dchashTbl, afs_dhashsize * sizeof(afs_int32));
afs_blocksUsed = afs_dcentries = 0;
+ afs_stats_cmperf.cacheBucket0_Discarded =
+ afs_stats_cmperf.cacheBucket1_Discarded =
+ afs_stats_cmperf.cacheBucket2_Discarded = 0;
hzero(afs_indexCounter);
afs_freeDCCount = 0;
QInit(&afs_DLRU);
}
+
+#if defined(AFS_DISCON_ENV)
+
+/*!
+ * Make a shadow copy of a dir's dcaches. It's used for disconnected
+ * operations like remove/create/rename to keep the original directory data.
+ * On reconnection, we can diff the original data with the server and get the
+ * server changes and with the local data to get the local changes.
+ *
+ * \param avc The dir vnode.
+ *
+ * \return 0 for success.
+ *
+ * \note The only lock allowed to be set is the dir's vcache entry, and it
+ * must be set in write mode.
+ * \note The vcache entry must be write locked.
+ */
+int afs_MakeShadowDir(struct vcache *avc)
+{
+ int j, i, index, code, ret_code = 0, offset, trans_size, block;
+ struct dcache *tdc, *new_dc = NULL;
+ struct osi_file *tfile_src, *tfile_dst;
+ struct VenusFid shadow_fid;
+ char *data;
+ int lock_held = 0;
+
+ /* Is this a dir? */
+ if (vType(avc) != VDIR)
+ return ENOTDIR;
+
+ /* Generate a fid for the shadow dir. */
+ shadow_fid.Cell = avc->fid.Cell;
+ shadow_fid.Fid.Volume = avc->fid.Fid.Volume;
+ afs_GenShadowFid(&shadow_fid);
+
+ /* For each dcache, do copy it into a new fresh one. */
+ i = DVHash(&avc->fid);
+ for (index = afs_dvhashTbl[i]; index != NULLIDX; index = i) {
+ /* Making sure that this isn't going to get locked twice. */
+ if (!lock_held) {
+ /* XXX: Moved it from outside of the loop.
+ * Maybe it's not quite okay because of the use of
+ * dvhashTbl (once) in the for statement.
+ */
+ ObtainWriteLock(&afs_xdcache, 716);
+ lock_held = 1;
+ }
+
+ i = afs_dvnextTbl[index];
+ if (afs_indexUnique[index] == avc->fid.Fid.Unique) {
+ tdc = afs_GetDSlot(index, NULL);
+
+ ReleaseReadLock(&tdc->tlock);
+
+ if (!FidCmp(&tdc->f.fid, &avc->fid)) {
+
+ /* Got a dir's dcache. */
+ lock_held = 0;
+
+ /* Get a fresh dcache. */
+ new_dc = afs_AllocDCache(avc, 0, 0, &shadow_fid);
+
+ /* Unlock hash for now. Don't need it during operations on the
+ * dcache. Oh, and we can't use it because of the locking
+ * hierarchy...
+ */
+ /* XXX: So much for lock ierarchy, the afs_AllocDCache doesn't
+ * respect it.
+ */
+ //ReleaseWriteLock(&afs_xdcache);
+
+ ObtainReadLock(&tdc->lock);
+
+ /* Set up the new fid. */
+ /* Copy interesting data from original dir dcache. */
+ new_dc->mflags = tdc->mflags;
+ new_dc->dflags = tdc->dflags;
+ new_dc->f.modTime = tdc->f.modTime;
+ new_dc->f.versionNo = tdc->f.versionNo;
+ new_dc->f.states = tdc->f.states;
+ new_dc->f.chunk= tdc->f.chunk;
+ new_dc->f.chunkBytes = tdc->f.chunkBytes;
+
+ /*
+ * Now add to the two hash chains - note that i is still set
+ * from the above DCHash call.
+ */
+ //ObtainWriteLock(&afs_xdcache, 713);
+
+ j = DCHash(&shadow_fid, 0);
+ afs_dcnextTbl[new_dc->index] = afs_dchashTbl[j];
+ afs_dchashTbl[j] = new_dc->index;
+
+ j = DVHash(&shadow_fid);
+ afs_dvnextTbl[new_dc->index] = afs_dvhashTbl[j];
+ afs_dvhashTbl[j] = new_dc->index;
+ afs_MaybeWakeupTruncateDaemon();
+
+ ReleaseWriteLock(&afs_xdcache);
+
+ /* Make sure and flush dir buffers back into the disk cache */
+ DFlushDCache(tdc);
+
+ /* Alloc a 4k block. */
+ data = (char *) afs_osi_Alloc(4096);
+ if (!data) {
+ printf("afs_MakeShadowDir: could not alloc data\n");
+ ret_code = ENOMEM;
+ goto done;
+ }
+
+ /* Open the files. */
+ tfile_src = afs_CFileOpen(tdc->f.inode);
+ tfile_dst = afs_CFileOpen(new_dc->f.inode);
+
+ /* Init no of blocks to be read and offset. */
+ block = (tdc->f.chunkBytes / 4096);
+ offset = 0;
+
+ /* And now copy dir dcache data into this dcache,
+ * 4k at a time.
+ */
+ while (block >= 0) {
+
+ /* Last chunk might have less bytes to transfer. */
+ if (!block) {
+ /* Last block. */
+ trans_size = (tdc->f.chunkBytes % 4096);
+ if (!trans_size)
+ /* An exact no of 4k blocks. */
+ break;
+ } else
+ trans_size = 4096;
+
+ /* Read a chunk from the dcache. */
+ code = afs_CFileRead(tfile_src, offset, data, trans_size);
+ if (code < trans_size) {
+ /* Can't access file, stop doing stuff and return error. */
+ ret_code = EIO;
+ break;
+ }
+
+ /* Write it to the new dcache. */
+ code = afs_CFileWrite(tfile_dst, offset, data, trans_size);
+ if (code < trans_size) {
+ ret_code = EIO;
+ break;
+ }
+
+ block--;
+ offset += 4096;
+ } /* while (block) */
+
+ afs_CFileClose(tfile_dst);
+ afs_CFileClose(tfile_src);
+
+ afs_osi_Free(data, 4096);
+
+ ReleaseWriteLock(&new_dc->lock);
+ ReleaseReadLock(&tdc->lock);
+
+ afs_PutDCache(new_dc);
+ } /* if dcache fid match */
+ afs_PutDCache(tdc);
+ } /* if unuiquifier match */
+ }
+done:
+ if (lock_held)
+ ReleaseWriteLock(&afs_xdcache);
+
+ if (!ret_code) {
+ if (!avc->ddirty_flags) {
+ ObtainWriteLock(&afs_DDirtyVCListLock, 763);
+ AFS_DISCON_ADD_DIRTY(avc, 1);
+ ReleaseWriteLock(&afs_DDirtyVCListLock);
+ }
+ avc->shVnode = shadow_fid.Fid.Vnode;
+ avc->shUnique = shadow_fid.Fid.Unique;
+ avc->ddirty_flags |= VDisconShadowed;
+ }
+
+ return ret_code;
+}
+
+/*!
+ * Delete the dcaches of a shadow dir.
+ *
+ * \param avc The vcache containing the shadow fid.
+ *
+ * \note avc must be write locked.
+ */
+void afs_DeleteShadowDir(struct vcache *avc)
+{
+ struct dcache *tdc;
+ struct VenusFid shadow_fid;
+
+ shadow_fid.Cell = avc->fid.Cell;
+ shadow_fid.Fid.Volume = avc->fid.Fid.Volume;
+ shadow_fid.Fid.Vnode = avc->shVnode;
+ shadow_fid.Fid.Unique = avc->shUnique;
+
+ tdc = afs_FindDCacheByFid(&shadow_fid);
+ if (tdc) {
+ afs_HashOutDCache(tdc, 1);
+ afs_DiscardDCache(tdc);
+ afs_PutDCache(tdc);
+ }
+ /* Remove shadowed dir flag. */
+ avc->ddirty_flags &= ~VDisconShadowed;
+}
+#endif
git://git.openafs.org / openafs.git / blobdiff