lkml.org 
[lkml]   [2001]   [May]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Getting FS access events


    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.

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 12:53    [W:4.176 / U:0.172 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site