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Add direct_io option

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This commit is contained in:
Marcus Holland-Moritz 2020-12-02 18:34:39 +01:00
parent 8af78e5062
commit 915a75eacb
2 changed files with 15 additions and 1 deletions
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10
doc/dwarfs.md
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@ -74,6 +74,16 @@ options:
this option to keep the compressed image data in the kernel
cache.
* `-o direct_io`
By default, files in the mounted file system will be cached by
the kernel. This significantly improves performance when accessing
the same files over and over again, especially if the data from
these files has been (partially) evicted from the block cache of
`dwarfs`. By setting this option, you can force the fuse driver
to not use the kernel cache for file data. If you're short on
memory and only infrequently accessing files, this can be worth
trying.
* `-o debuglevel=`*name*:
Use this for different levels of verbosity along with either
the `-f` or `-d` FUSE options. This can give you some insight

6
src/dwarfs.cpp
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@ -54,6 +54,7 @@ struct options {
const char* decompress_ratio_str; // TODO: const?? -> use string?
int enable_nlink;
int no_image_madvise;
int direct_io;
size_t cachesize;
size_t workers;
mlock_mode lock_mode;
@ -79,6 +80,7 @@ const struct fuse_opt dwarfs_opts[] = {
DWARFS_OPT("decratio=%s", decompress_ratio_str, 0),
DWARFS_OPT("enable_nlink", enable_nlink, 1),
DWARFS_OPT("no_image_madvise", no_image_madvise, 1),
DWARFS_OPT("direct_io", direct_io, 1),
FUSE_OPT_END};
options s_opts;
@ -252,7 +254,8 @@ void op_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info* fi) {
err = EACCES;
} else {
fi->fh = FUSE_ROOT_ID + entry->inode();
fi->keep_cache = 1;
fi->direct_io = s_opts.direct_io;
fi->keep_cache = !s_opts.direct_io;
fuse_reply_open(req, fi);
return;
}
@ -396,6 +399,7 @@ void usage(const char* progname) {
<< " -o decratio=NUM ratio for full decompression (0.8)\n"
<< " -o enable_nlink show correct hardlink numbers\n"
<< " -o no_image_madvise keep image in kernel cache\n"
<< " -o direct_io don't keep files in kernel cache\n"
<< " -o debuglevel=NAME error, warn, (info), debug, trace\n"
<< std::endl;