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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-21 11:54:28 +0000 |
commit | e6918187568dbd01842d8d1d2c808ce16a894239 (patch) | |
tree | 64f88b554b444a49f656b6c656111a145cbbaa28 /src/doc/lazy_posix.txt | |
parent | Initial commit. (diff) | |
download | ceph-e6918187568dbd01842d8d1d2c808ce16a894239.tar.xz ceph-e6918187568dbd01842d8d1d2c808ce16a894239.zip |
Adding upstream version 18.2.2.upstream/18.2.2
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/doc/lazy_posix.txt')
-rw-r--r-- | src/doc/lazy_posix.txt | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/src/doc/lazy_posix.txt b/src/doc/lazy_posix.txt new file mode 100644 index 000000000..a7bc34e30 --- /dev/null +++ b/src/doc/lazy_posix.txt @@ -0,0 +1,53 @@ + +http://www.usenix.org/events/fast05/wips/slides/welch.pdf + + + +-- STATLITE + statlite(const char *filename, struct statlite *buf); + fstatlite(int fd, struct statlite *buf); + lstatlite(const char *filename, struct statlite *buf); + + * file size, mtime are optionally not guaranteed to be correct + * mask field to specify which fields you need to be correct + + +-- READDIR+ + + struct dirent_plus *readdirplus(DIR *dirp); + int readdirplus_r(DIR *dirp, struct dirent_plus *entry, struct dirent_plus **result); + struct dirent_lite *readdirlite(DIR *dirp); + int readdirlite_r(DIR *dirp, struct dirent_lite *entry, struct dirent_lite **result); + + * plus returns lstat + * lite returns lstatlite + + +-- lazy i/o integrity + + FIXME: currently missing call to flag an Fd/file has lazy. used to be O_LAZY on open, but no more. + + * relax data coherency + * writes may not be visible until lazyio_propagate, fsync, close + + lazyio_propagate(int fd, off_t offset, size_t count); + * my writes are safe + + lazyio_synchronize(int fd, off_t offset, size_t count); + * i will see everyone else's propagated writes + +-- read/write non-serial vectors + + ssize_t readx(int fd, const struct iovec *iov, size_t iov_count, struct xtvec *xtv, size_t xtv_count); + ssize_t writex(int fd, const struct iovec *iov, size_t iov_count, struct xtvec *xtv, size_t xtv_count); + + * like readv/writev, but serial + * + + +int lockg(int fd, int cmd, lgid_t *lgid) + group locks + +int openg(char *path, int mode, fh_t *handle); + portable file handle +int sutoc(fh_t *fh); |