ru.unix.bsd

 
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 From : Slawa Olhovchenkov                   2:5030/500     28 Oct 2007  17:38:50
 To : All
 Subject : Вести с полей
 -------------------------------------------------------------------------------- 
 

 
 bde         2007-10-18 07:26:21 UTC
 
   FreeBSD src repository
 
   Modified files:
     sys/fs/msdosfs       msdosfs_vnops.c
   Log:
   In msdosfs_settattr(), don't do synchronous updates of the denode
   (except indirectly for the size pseudo-attribute).  If anything deserves
   a sync update, then it is ids and immutable flags, since these are
   related to security, but ffs never synced these and msdosfs doesn't
   support them.  (ufs_setattr() only does an update in one case where
   it is least needed (for timestamps); it did pessimal sync updates for
   timestamps until 1998/03/08 but was changed for unlogged reasons related
   to soft updates.)
 
   Now msdosfs calls deupdat() with waitfor == 0, which normally gives a
   delayed update to disk but always gives a sync update of timestamps
   in core, while for ffs everything is delayed until the syncer daemon
   or other activity causes an update (except for timestamps).
 
   This gives a large optimization mainly for things like cp -p, where
   attribute adjustment could easily triple the number of physical I/O's
   if it is done synchronously (but cp -p to msdosfs is not as bad as
   that, since msdosfs doesn't support many attributes so null adjustments
   are more common, and msdosfs doesn't support ctimes so even if cp
   doesn't weed out null adjustments they don't become non-null after
   clobbering the ctime).
 
   Revision  Changes    Path
   1.180     +1 -1      src/sys/fs/msdosfs/msdosfs_vnops.c
 ... Здесь вам не Aнглия, копайте глубже!
 --- GoldED+/BSD 1.1.5
  * Origin:  (2:5030/500)
 
 

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