Messages in this thread | | | Date | Tue, 15 May 2001 04:33:57 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: Getting FS access events |
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On Tue, 15 May 2001, Linus Torvalds wrote:
> Looks like there are 19 filesystems that use the buffer cache right now: > > grep -l bread fs/*/*.c | cut -d/ -f2 | sort -u | wc > > So quite a bit of work involved.
UNIX-like ones (and that includes QNX) are easy. HFS is hopeless - it won't be fixed unless authors will do it. Tigran will probably fix BFS just as a learning experience ;-) ADFS looks tolerably easy to fix. AFFS... directories will be pure hell - blocks jump from directory to directory at zero notice. NTFS and HPFS will win from switch (esp. NTFS). FAT is not a problem, if we are willing to break CVF and let author fix it. Reiserfs... Dunno. They've got a private (slightly mutated) copy of ~60% of fs/buffer.c. UDF should be OK. ISOFS... ask Peter. JFFS - dunno.
So probably we'll have to keep the buffer cache (AFFS looks like a real killer), but we will be able to do pagecache-only versions of a_ops methods. If fs has no metadata in buffer cache we can drop unmap_underlying_metadata() for it.
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