| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/lockd/svcshare.c |
| 3 | * |
| 4 | * Management of DOS shares. |
| 5 | * |
| 6 | * Copyright (C) 1996 Olaf Kirch <okir@monad.swb.de> |
| 7 | */ |
| 8 | |
| 9 | #include <linux/time.h> |
| 10 | #include <linux/unistd.h> |
| 11 | #include <linux/string.h> |
| 12 | #include <linux/slab.h> |
| 13 | |
| 14 | #include <linux/sunrpc/clnt.h> |
| 15 | #include <linux/sunrpc/svc.h> |
| 16 | #include <linux/lockd/lockd.h> |
| 17 | #include <linux/lockd/share.h> |
| 18 | |
| 19 | static inline int |
| 20 | nlm_cmp_owner(struct nlm_share *share, struct xdr_netobj *oh) |
| 21 | { |
| 22 | return share->s_owner.len == oh->len |
| 23 | && !memcmp(share->s_owner.data, oh->data, oh->len); |
| 24 | } |
| 25 | |
| 26 | u32 |
| 27 | nlmsvc_share_file(struct nlm_host *host, struct nlm_file *file, |
| 28 | struct nlm_args *argp) |
| 29 | { |
| 30 | struct nlm_share *share; |
| 31 | struct xdr_netobj *oh = &argp->lock.oh; |
| 32 | u8 *ohdata; |
| 33 | |
| 34 | for (share = file->f_shares; share; share = share->s_next) { |
| 35 | if (share->s_host == host && nlm_cmp_owner(share, oh)) |
| 36 | goto update; |
| 37 | if ((argp->fsm_access & share->s_mode) |
| 38 | || (argp->fsm_mode & share->s_access )) |
| 39 | return nlm_lck_denied; |
| 40 | } |
| 41 | |
| 42 | share = (struct nlm_share *) kmalloc(sizeof(*share) + oh->len, |
| 43 | GFP_KERNEL); |
| 44 | if (share == NULL) |
| 45 | return nlm_lck_denied_nolocks; |
| 46 | |
| 47 | /* Copy owner handle */ |
| 48 | ohdata = (u8 *) (share + 1); |
| 49 | memcpy(ohdata, oh->data, oh->len); |
| 50 | |
| 51 | share->s_file = file; |
| 52 | share->s_host = host; |
| 53 | share->s_owner.data = ohdata; |
| 54 | share->s_owner.len = oh->len; |
| 55 | share->s_next = file->f_shares; |
| 56 | file->f_shares = share; |
| 57 | |
| 58 | update: |
| 59 | share->s_access = argp->fsm_access; |
| 60 | share->s_mode = argp->fsm_mode; |
| 61 | return nlm_granted; |
| 62 | } |
| 63 | |
| 64 | /* |
| 65 | * Delete a share. |
| 66 | */ |
| 67 | u32 |
| 68 | nlmsvc_unshare_file(struct nlm_host *host, struct nlm_file *file, |
| 69 | struct nlm_args *argp) |
| 70 | { |
| 71 | struct nlm_share *share, **shpp; |
| 72 | struct xdr_netobj *oh = &argp->lock.oh; |
| 73 | |
| 74 | for (shpp = &file->f_shares; (share = *shpp) != 0; shpp = &share->s_next) { |
| 75 | if (share->s_host == host && nlm_cmp_owner(share, oh)) { |
| 76 | *shpp = share->s_next; |
| 77 | kfree(share); |
| 78 | return nlm_granted; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | /* X/Open spec says return success even if there was no |
| 83 | * corresponding share. */ |
| 84 | return nlm_granted; |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * Traverse all shares for a given file (and host). |
| 89 | * NLM_ACT_CHECK is handled by nlmsvc_inspect_file. |
| 90 | */ |
| 91 | int |
| 92 | nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, int action) |
| 93 | { |
| 94 | struct nlm_share *share, **shpp; |
| 95 | |
| 96 | shpp = &file->f_shares; |
| 97 | while ((share = *shpp) != NULL) { |
| 98 | if (action == NLM_ACT_MARK) |
| 99 | share->s_host->h_inuse = 1; |
| 100 | else if (action == NLM_ACT_UNLOCK) { |
| 101 | if (host == NULL || host == share->s_host) { |
| 102 | *shpp = share->s_next; |
| 103 | kfree(share); |
| 104 | continue; |
| 105 | } |
| 106 | } |
| 107 | shpp = &share->s_next; |
| 108 | } |
| 109 | |
| 110 | return 0; |
| 111 | } |