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DEVEL15-windows-follow-backup-path-20071207

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LICENSE MIT

Add a registry value, FollowBackupPath, that provides the Windows cache
manager with functionality equivalent to the UNIX afsd -backuptree option.


(cherry picked from commit ab939a6216161cd6afab74e60ca87d376145651c)
This commit is contained in:
Jeffrey Altman 2007-12-07 16:05:22 +00:00
parent 938298512f
commit daddcce435
3 changed files with 38 additions and 12 deletions
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11
src/WINNT/afsd/afsd_init.c
View File

@ -42,6 +42,7 @@ extern int RXSTATS_ExecuteRequest(struct rx_call *z_call);
extern afs_int32 cryptall;
extern int cm_enableServerLocks;
extern int cm_followBackupPath;
extern int cm_deleteReadOnly;
#ifdef USE_BPLUS
extern afs_int32 cm_BPlusTrees;
@ -1139,7 +1140,15 @@ int afsd_InitCM(char **reasonP)
cm_giveUpAllCBs = (unsigned short) dwValue;
}
afsi_log("CM GiveUpAllCallBacks is %u", cm_giveUpAllCBs);
dummyLen = sizeof(DWORD);
code = RegQueryValueEx(parmKey, "FollowBackupPath", NULL, NULL,
(BYTE *) &dwValue, &dummyLen);
if (code == ERROR_SUCCESS) {
cm_followBackupPath = (unsigned short) dwValue;
}
afsi_log("CM FollowBackupPath is %u", cm_followBackupPath);
RegCloseKey (parmKey);
cacheBlocks = ((afs_uint64)cacheSize * 1024) / blockSize;

37
src/WINNT/afsd/cm_vnodeops.c
View File

@ -31,6 +31,8 @@ extern void afsi_log(char *pattern, ...);
int cm_enableServerLocks = 1;
int cm_followBackupPath = 0;
/*
* Case-folding array. This was constructed by inspecting of SMBtrace output.
* I do not know anything more about it.
@ -1050,7 +1052,7 @@ long cm_FollowMountPoint(cm_scache_t *scp, cm_scache_t *dscp, cm_user_t *userp,
char mtType;
cm_fid_t tfid;
size_t vnLength;
int type;
int targetType;
if (scp->mountRootFid.cell != 0 && scp->mountRootGen >= cm_data.mountRootGen) {
tfid = scp->mountRootFid;
@ -1094,15 +1096,15 @@ long cm_FollowMountPoint(cm_scache_t *scp, cm_scache_t *dscp, cm_user_t *userp,
vnLength = strlen(volNamep);
if (vnLength >= 8 && strcmp(volNamep + vnLength - 7, ".backup") == 0)
type = BACKVOL;
targetType = BACKVOL;
else if (vnLength >= 10
&& strcmp(volNamep + vnLength - 9, ".readonly") == 0)
type = ROVOL;
targetType = ROVOL;
else
type = RWVOL;
targetType = RWVOL;
/* check for backups within backups */
if (type == BACKVOL
if (targetType == BACKVOL
&& (scp->flags & (CM_SCACHEFLAG_RO | CM_SCACHEFLAG_PURERO))
== CM_SCACHEFLAG_RO) {
code = CM_ERROR_NOSUCHVOLUME;
@ -1132,17 +1134,30 @@ long cm_FollowMountPoint(cm_scache_t *scp, cm_scache_t *dscp, cm_user_t *userp,
lock_ReleaseMutex(&volp->mx);
scp->mountRootFid.cell = cellp->cellID;
/* if the mt pt originates in a .backup volume (not a .readonly)
* and FollowBackupPath is active, and if there is a .backup
* volume for the target, then use the .backup of the target
* instead of the read-write.
*/
if (cm_followBackupPath && targetType == RWVOL &&
(scp->flags & CM_SCACHEFLAG_RO|CM_SCACHEFLAG_PURERO) == CM_SCACHEFLAG_RO &&
volp->bk.ID != 0) {
targetType = BACKVOL;
}
/* if the mt pt is in a read-only volume (not just a
* backup), and if there is a read-only volume for the
* target, and if this is a type '#' mount point, use
* target, and if this is a targetType '#' mount point, use
* the read-only, otherwise use the one specified.
*/
if (mtType == '#' && (scp->flags & CM_SCACHEFLAG_PURERO)
&& volp->ro.ID != 0 && type == RWVOL)
type = ROVOL;
if (type == ROVOL)
else if (mtType == '#' && targetType == RWVOL &&
(scp->flags & CM_SCACHEFLAG_PURERO) &&
volp->ro.ID != 0) {
targetType = ROVOL;
}
if (targetType == ROVOL)
scp->mountRootFid.volume = volp->ro.ID;
else if (type == BACKVOL)
else if (targetType == BACKVOL)
scp->mountRootFid.volume = volp->bk.ID;
else
scp->mountRootFid.volume = volp->rw.ID;

2
src/WINNT/afsd/cm_vnodeops.h
View File

@ -14,6 +14,8 @@ extern unsigned int cm_mountRootGen;
extern int cm_enableServerLocks;
extern int cm_followBackupPath;
/* parms for attribute setting call */
typedef struct cm_attr {
int mask;