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Feature #3679

closed

Any API to get metadata?

Added by lollipop king over 11 years ago. Updated over 11 years ago.

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Description

hello,there.
I am wondering if there is any API to get the metadata of a file .
I have the ceph file system run by mounting it to the /mnt/ceph
I want to know how many chunks the file has been parted,and where the chunks have been stored.
Is there any API I can use to get the information?

Thank you very much!

from lollipop

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 #1

Updated by Sage Weil over 11 years ago

  • Status changed from New to Closed

Yep! See libcephfs. There is

int ceph_get_file_stripe_unit(struct ceph_mount_info *cmount, int fh);
int ceph_get_file_pool(struct ceph_mount_info *cmount, int fh);
int ceph_get_file_replication(struct ceph_mount_info *cmount, int fh);
int ceph_get_file_stripe_address(struct ceph_mount_info *cmount, int fd, loff_t offset,
                 struct sockaddr_storage *addr, int naddr);

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