/* * linux/fs/lockd/svcshare.c * * Management of DOS shares. * * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> */ #include <linux/time.h> #include <linux/unistd.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/svc.h> #include <linux/lockd/lockd.h> #include <linux/lockd/share.h> static inline int nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh) { return share->s_owner.len == oh->len && !memcmp(share->s_owner.data, oh->data, oh->len); } u32 nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file, struct nlm_args *argp) { struct nlm_share *share; struct xdr_netobj *oh = &argp->lock.oh; u8 *ohdata; for (share = file->f_shares; share; share = share->s_next) { if (share->s_host == host && nlm_cmp_owner(share, oh)) goto update; if ((argp->fsm_access & share->s_mode) || (argp->fsm_mode & share->s_access )) return nlm_lck_denied; } share = (struct nlm_share *) kmalloc(sizeof(*share) + oh->len, GFP_KERNEL); if (share == NULL) return nlm_lck_denied_nolocks; /* Copy owner handle */ ohdata = (u8 *) (share + 1); memcpy(ohdata, oh->data, oh->len); share->s_file = file; share->s_host = host; share->s_owner.data = ohdata; share->s_owner.len = oh->len; share->s_next = file->f_shares; file->f_shares = share; update: share->s_access = argp->fsm_access; share->s_mode = argp->fsm_mode; return nlm_granted; } /* * Delete a share. */ u32 nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file, struct nlm_args *argp) { struct nlm_share *share, **shpp; struct xdr_netobj *oh = &argp->lock.oh; for (shpp = &file->f_shares; (share = *shpp) != 0; shpp = &share->s_next) { if (share->s_host == host && nlm_cmp_owner(share, oh)) { *shpp = share->s_next; kfree(share); return nlm_granted; } } /* X/Open spec says return success even if there was no * corresponding share. */ return nlm_granted; } /* * Traverse all shares for a given file (and host). * NLM_ACT_CHECK is handled by nlmsvc_inspect_file. */ void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, int action) { struct nlm_share *share, **shpp; shpp = &file->f_shares; while ((share = *shpp) != NULL) { if (action == NLM_ACT_MARK) share->s_host->h_inuse = 1; else if (action == NLM_ACT_UNLOCK) { if (host == NULL || host == share->s_host) { *shpp = share->s_next; kfree(share); continue; } } shpp = &share->s_next; } }