SharedFolders

Timestamp:

Oct 17, 2011 3:20:40 PM (14 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

74412

Message:

Additions/solaris/SharedFolders: update comments.

File:

trunk/src/VBox/Additions/solaris/SharedFolders/vboxfs_vnode.c

-              r38943
+              r39009
  * the vnode becomes completely inactive.
+ *
+ * No file data is cached in the guest. This means we don't support mmap() yet.
+ * A future version could relatively easily add support for read-only
+ * mmap(MAP_SHARED) and any mmap(MAP_PRIVATE). But a la ZFS, this data caching
+ * would not be coherent with normal simultaneous read()/write() operations,
+ * nor will it be coherent with data access on the host. Writable
+ * mmap(MAP_SHARED) access is possible, but guaranteeing any kind of coherency
+ * with concurrent activity on the host would be near impossible with the
+ * existing interfaces.
+ * We suppport only read-only mmap (VBOXVFS_WITH_MMAP) i.e. MAP_SHARED,
+ * MAP_PRIVATE in PROT_READ, this data caching would not be coherent with
+ * normal simultaneous read()/write() operations, nor will it be coherent
+ * with data access on the host. Writable mmap(MAP_SHARED) access is not
+ * implemented, as guaranteeing any kind of coherency with concurrent
+ * activity on the host would be near impossible with the existing
+ * interfaces.
+ *
  * A note about locking. sffs is not a high performance file system.

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