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VM: readd support for forgetting cached FS blocks

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Not all services involved in block I/O go through VM to access the
blocks they need.  As a result, the blocks in VM may become stale,
possibly causing corruption when the stale copy is restored by a
service that does go through VM later on.  This patch restores support
for forgetting cached blocks that belong to a particular device, and
makes the relevant file systems use this functionality 1) when
requested by VFS through REQ_FLUSH, and 2) upon unmount.

Change-Id: I0758c5ed8fe4b5ba81d432595d2113175776aff8
This commit is contained in:
David van Moolenbroek
2014-03-01 09:04:53 +01:00
committed by sambuc
parent df724f2e14
commit b48542d914
15 changed files with 75 additions and 14 deletions
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etc/system.conf
+3 -3
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@@ -110,7 +110,7 @@ service mfs
{
ipc ALL_SYS; # All system ipc targets allowed
system BASIC; # Only basic kernel calls allowed
vm MAPCACHEPAGE SETCACHEPAGE;
vm MAPCACHEPAGE SETCACHEPAGE CLEARCACHE;
io NONE; # No I/O range allowed
irq NONE; # No IRQ allowed
sigmgr rs; # Signal manager is RS
@@ -137,7 +137,7 @@ service ext2
{
ipc ALL_SYS; # All system ipc targets allowed
system BASIC; # Only basic kernel calls allowed
vm MAPCACHEPAGE SETCACHEPAGE;
vm MAPCACHEPAGE SETCACHEPAGE CLEARCACHE;
io NONE; # No I/O range allowed
irq NONE; # No IRQ allowed
sigmgr rs; # Signal manager is RS
@@ -150,7 +150,7 @@ service pfs
{
ipc ALL_SYS; # All system ipc targets allowed
system BASIC; # Only basic kernel calls allowed
vm MAPCACHEPAGE SETCACHEPAGE;
vm MAPCACHEPAGE SETCACHEPAGE CLEARCACHE;
io NONE; # No I/O range allowed
irq NONE; # No IRQ allowed
sigmgr rs; # Signal manager is RS