projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 52921e02 | 26 | __be32 |
| 1da177e4 LT |
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 | ||
| 5cbded58 | 42 | share = kmalloc(sizeof(*share) + oh->len, |
| 1da177e4 LT |
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 | */ | |
| 52921e02 | 67 | __be32 |
| 1da177e4 LT |
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 | ||
| 93245d11 HH |
74 | for (shpp = &file->f_shares; (share = *shpp) != NULL; |
| 75 | shpp = &share->s_next) { | |
| 1da177e4 LT |
76 | if (share->s_host == host && nlm_cmp_owner(share, oh)) { |
| 77 | *shpp = share->s_next; | |
| 78 | kfree(share); | |
| 79 | return nlm_granted; | |
| 80 | } | |
| 81 | } | |
| 82 | ||
| 83 | /* X/Open spec says return success even if there was no | |
| 84 | * corresponding share. */ | |
| 85 | return nlm_granted; | |
| 86 | } | |
| 87 | ||
| 88 | /* | |
| f2af793d OK |
89 | * Traverse all shares for a given file, and delete |
| 90 | * those owned by the given (type of) host | |
| 1da177e4 | 91 | */ |
| f2af793d OK |
92 | void nlmsvc_traverse_shares(struct nlm_host *host, struct nlm_file *file, |
| 93 | nlm_host_match_fn_t match) | |
| 1da177e4 LT |
94 | { |
| 95 | struct nlm_share *share, **shpp; | |
| 96 | ||
| 97 | shpp = &file->f_shares; | |
| 98 | while ((share = *shpp) != NULL) { | |
| f2af793d OK |
99 | if (match(share->s_host, host)) { |
| 100 | *shpp = share->s_next; | |
| 101 | kfree(share); | |
| 102 | continue; | |
| 1da177e4 LT |
103 | } |
| 104 | shpp = &share->s_next; | |
| 105 | } | |
| 1da177e4 | 106 | } |