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feat(dwarfs): add preload_category option

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Marcus Holland-Moritz 2025-04-04 15:50:57 +02:00
parent 85ce5380b5
commit c061a5253d
2 changed files with 12 additions and 0 deletions
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5
doc/dwarfs.md
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@ -115,6 +115,11 @@ options:
system contains directories with entries that only differ in
case.
- `-o preload_category=`*category*:
Preload all blocks from this category when mounting the file
system. This is typically used together with the `mkdwarfs`
"hotness" categorizer.
- `-o (no_)cache_image`:
By default, `dwarfs` tries to ensure that the compressed file
system image will not be cached by the kernel (i.e. the default

7
tools/src/dwarfs_main.cpp
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@ -169,6 +169,7 @@ struct options {
char const* cachesize_str{nullptr}; // TODO: const?? -> use string?
char const* blocksize_str{nullptr}; // TODO: const?? -> use string?
char const* readahead_str{nullptr}; // TODO: const?? -> use string?
char const* preload_category_str{nullptr}; // TODO: const?? -> use string?
char const* debuglevel_str{nullptr}; // TODO: const?? -> use string?
char const* workers_str{nullptr}; // TODO: const?? -> use string?
char const* mlock_str{nullptr}; // TODO: const?? -> use string?
@ -267,6 +268,7 @@ constexpr std::array dwarfs_opts{
DWARFS_OPT("tidy_interval=%s", cache_tidy_interval_str, 0),
DWARFS_OPT("tidy_max_age=%s", cache_tidy_max_age_str, 0),
DWARFS_OPT("seq_detector=%s", seq_detector_thresh_str, 0),
DWARFS_OPT("preload_category=%s", preload_category_str, 0),
DWARFS_OPT("enable_nlink", enable_nlink, 1),
DWARFS_OPT("readonly", readonly, 1),
DWARFS_OPT("case_insensitive", case_insensitive, 1),
@ -396,6 +398,10 @@ void op_init_common(void* data) {
// we must do this *after* the fuse driver has forked into background
userdata.fs.set_cache_tidy_config(tidy);
if (userdata.opts.preload_category_str) {
userdata.fs.cache_blocks_by_category(userdata.opts.preload_category_str);
}
}
#if DWARFS_FUSE_LOWLEVEL
@ -1199,6 +1205,7 @@ void usage(std::ostream& os, std::filesystem::path const& progname) {
<< " -o enable_nlink show correct hardlink numbers\n"
<< " -o readonly show read-only file system\n"
<< " -o case_insensitive perform case-insensitive lookups\n"
<< " -o preload_category=NAME preload blocks from this category\n"
<< " -o (no_)cache_image (don't) keep image in kernel cache\n"
<< " -o (no_)cache_files (don't) keep files in kernel cache\n"
<< " -o debuglevel=NAME " << logger::all_level_names() << "\n"