diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 02:20:36 +0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/lockd/svcshare.c |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/lockd/svcshare.c')
-rw-r--r-- | fs/lockd/svcshare.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/fs/lockd/svcshare.c b/fs/lockd/svcshare.c new file mode 100644 index 000000000000..4943fb7836ce --- /dev/null +++ b/fs/lockd/svcshare.c @@ -0,0 +1,111 @@ +/* + * 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. + */ +int +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; + } + + return 0; +} |