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| author | Pierre Peiffer <pierre.peiffer@bull.net> | 2008-04-29 01:00:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:13 -0700 |
| commit | 016d7132f246a05e6e34ccba157fa278a96c45ae (patch) | |
| tree | a7003a30b2c2e4a399f6394a860b10fbd1afa4da /ipc/sem.c | |
| parent | 21a4826a7c49bddebbe8d83d232f6416f1697ff0 (diff) | |
| download | lwn-016d7132f246a05e6e34ccba157fa278a96c45ae.tar.gz lwn-016d7132f246a05e6e34ccba157fa278a96c45ae.zip | |
IPC: get rid of the use *_setbuf structure.
All IPCs make use of an intermetiate *_setbuf structure to handle the IPC_SET
command. This is not really needed and, moreover, it complicates a little bit
the code.
This patch gets rid of the use of it and uses directly the semid64_ds/
msgid64_ds/shmid64_ds structure.
In addition of removing one struture declaration, it also simplifies and
improves a little bit the common 64-bits path.
Signed-off-by: Pierre Peiffer <pierre.peiffer@bull.net>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Nadia Derbey <Nadia.Derbey@bull.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/sem.c')
| -rw-r--r-- | ipc/sem.c | 40 |
1 files changed, 14 insertions, 26 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index db161decb764..df98de290475 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -835,28 +835,14 @@ out_free: return err; } -struct sem_setbuf { - uid_t uid; - gid_t gid; - mode_t mode; -}; - -static inline unsigned long copy_semid_from_user(struct sem_setbuf *out, void __user *buf, int version) +static inline unsigned long +copy_semid_from_user(struct semid64_ds *out, void __user *buf, int version) { switch(version) { case IPC_64: - { - struct semid64_ds tbuf; - - if(copy_from_user(&tbuf, buf, sizeof(tbuf))) + if (copy_from_user(out, buf, sizeof(*out))) return -EFAULT; - - out->uid = tbuf.sem_perm.uid; - out->gid = tbuf.sem_perm.gid; - out->mode = tbuf.sem_perm.mode; - return 0; - } case IPC_OLD: { struct semid_ds tbuf_old; @@ -864,9 +850,9 @@ static inline unsigned long copy_semid_from_user(struct sem_setbuf *out, void __ if(copy_from_user(&tbuf_old, buf, sizeof(tbuf_old))) return -EFAULT; - out->uid = tbuf_old.sem_perm.uid; - out->gid = tbuf_old.sem_perm.gid; - out->mode = tbuf_old.sem_perm.mode; + out->sem_perm.uid = tbuf_old.sem_perm.uid; + out->sem_perm.gid = tbuf_old.sem_perm.gid; + out->sem_perm.mode = tbuf_old.sem_perm.mode; return 0; } @@ -885,11 +871,11 @@ static int semctl_down(struct ipc_namespace *ns, int semid, { struct sem_array *sma; int err; - struct sem_setbuf uninitialized_var(setbuf); + struct semid64_ds semid64; struct kern_ipc_perm *ipcp; if(cmd == IPC_SET) { - if(copy_semid_from_user (&setbuf, arg.buf, version)) + if (copy_semid_from_user(&semid64, arg.buf, version)) return -EFAULT; } down_write(&sem_ids(ns).rw_mutex); @@ -906,7 +892,9 @@ static int semctl_down(struct ipc_namespace *ns, int semid, goto out_unlock; if (cmd == IPC_SET) { - err = audit_ipc_set_perm(0, setbuf.uid, setbuf.gid, setbuf.mode); + err = audit_ipc_set_perm(0, semid64.sem_perm.uid, + semid64.sem_perm.gid, + semid64.sem_perm.mode); if (err) goto out_unlock; } @@ -925,10 +913,10 @@ static int semctl_down(struct ipc_namespace *ns, int semid, freeary(ns, ipcp); goto out_up; case IPC_SET: - ipcp->uid = setbuf.uid; - ipcp->gid = setbuf.gid; + ipcp->uid = semid64.sem_perm.uid; + ipcp->gid = semid64.sem_perm.gid; ipcp->mode = (ipcp->mode & ~S_IRWXUGO) - | (setbuf.mode & S_IRWXUGO); + | (semid64.sem_perm.mode & S_IRWXUGO); sma->sem_ctime = get_seconds(); break; default: |