?? svcshare.c
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/* * 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 intnlm_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);}__be32nlmsvc_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 = 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. */__be32nlmsvc_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) != NULL; 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 delete * those owned by the given (type of) host */void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, nlm_host_match_fn_t match){ struct nlm_share *share, **shpp; shpp = &file->f_shares; while ((share = *shpp) != NULL) { if (match(share->s_host, host)) { *shpp = share->s_next; kfree(share); continue; } shpp = &share->s_next; }}
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