cefb55828f
(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). |
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| .. | ||
| cd9660 | ||
| coda | ||
| deadfs | ||
| devfs | ||
| fdescfs | ||
| fifofs | ||
| hpfs | ||
| msdosfs | ||
| ntfs | ||
| nullfs | ||
| nwfs | ||
| portalfs | ||
| procfs | ||
| pseudofs | ||
| smbfs | ||
| tmpfs | ||
| udf | ||
| unionfs | ||