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add link_cow feature

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When enabled if a regular file is opened which has a link count > 1 it will
copy the file to a temporary file and rename over the original. Effectively
breaking the link. This behavior is similar to cow-shell and other LD_PRELOAD
based "CoW" solutions.
This commit is contained in:
Antonio SJ Musumeci 2018-10-02 14:22:37 -04:00
parent 19a7d43b31
commit 93f7d7d927
18 changed files with 424 additions and 127 deletions
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5
src/option_parser.cpp
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@ -197,6 +197,8 @@ parse_and_process_kv_arg(Config &config,
rv = parse_and_process(value,config.ignorepponrename);
else if(key == "security_capability")
rv = parse_and_process(value,config.security_capability);
else if(key == "link_cow")
rv = parse_and_process(value,config.link_cow);
}
if(rv == -1)
@ -299,12 +301,15 @@ usage(void)
" timeout in seconds before will turn to symlinks.\n"
" default = 3600\n"
" -o nullrw=<bool> Disables reads and writes. For benchmarking.\n"
" default = false\n"
" -o ignorepponrename=<bool>\n"
" Ignore path preserving when performing renames\n"
" and links. default = false\n"
" -o security_capability=<bool>\n"
" When disabled return ENOATTR when the xattr\n"
" security.capability is queried. default = true\n"
" -o link_cow=<bool> delink/clone file on open to simulate CoW.\n"
" default = false\n"
<< std::endl;
}