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    SubjectRe: The argument for fs assistance in handling archives (was: silent semantic changes with reiser4)
    Salut,

    On Wed, Sep 01, 2004 at 01:50:56PM -0700, Linus Torvalds wrote:
    > #define MAXNAME 1024
    > int open_cached_view(int base_fd, char *type, char *subname)
    > {
    > struct stat st;
    > char filename[PATH_MAX];
    > char name[MAXNAME];
    > int len, cachefd;
    >
    > if (fstat(base_fd, &st) < 0)
    > return -1;
    > sprintf(name, "/proc/self/fd/%d", base_fd);
    > len = readlink(name, filename, sizeof(filename)-1);
    > if (len < 0)
    > return -1;
    > filename[len] = 0;
    >
    > /* FIXME! Replace '/' with '#' in "type" and "subname" */
    > len = snprintf(name, sizeof(name),
    > "%04llx/%04llx/%s/%s/%s",
    > (unsigned long long) st.st_dev,
    > (unsigned long long) st.st_ino,
    > type ? : "default",
    > subname,
    > filename);
    > errno = ENAMETOOLONG;
    > if (len >= sizeof(name))
    > return -1;
    > cachefd = open(name, O_RDONLY);
    > if (cachefd >= 0) {
    > /* Check mtime here - maybe we could have kernel support */
    > return cachefd;
    > }
    > if (errno != ENOENT)
    > return -1;
    > /*
    > .. try to generate cache file here ..
    > */

    Around of what I've had in mind. Only that one might use libmagic
    instead of the type argument. The rest can be done by a corresponding
    MIME plugin.

    Tonnerre
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