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Use shared vnode locks instead of exclusive vnode locks for the access(),

Browse source 
chdir(), chroot(), eaccess(), fpathconf(), fstat(), fstatfs(), lseek()
(when figuring out the current size of the file in the SEEK_END case),
pathconf(), readlink(), and statfs() system calls.

Submitted by:	ups (mostly)
Tested by:	pho
MFC after:	1 month
This commit is contained in:
John Baldwin 2008-11-03 20:31:00 +00:00
parent 30f60d8c31
commit 21fc02d271
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=184600
3 changed files with 16 additions and 16 deletions
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2
sys/kern/kern_descrip.c
View file

@ -1241,7 +1241,7 @@ fpathconf(struct thread *td, struct fpathconf_args *uap)
if (vp != NULL) {
int vfslocked;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_PATHCONF(vp, uap->name, td->td_retval);
VOP_UNLOCK(vp, 0);
VFS_UNLOCK_GIANT(vfslocked);

28
sys/kern/vfs_syscalls.c
View file

@ -286,8 +286,8 @@ kern_statfs(struct thread *td, char *path, enum uio_seg pathseg,
int error;
struct nameidata nd;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
pathseg, path, td);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
AUDITVNODE1, pathseg, path, td);
error = namei(&nd);
if (error)
return (error);
@ -368,7 +368,7 @@ kern_fstatfs(struct thread *td, int fd, struct statfs *buf)
return (error);
vp = fp->f_vnode;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(vp, LK_SHARED | LK_RETRY);
#ifdef AUDIT
AUDIT_ARG(vnode, vp, ARG_VNODE1);
#endif
@ -800,8 +800,8 @@ kern_chdir(struct thread *td, char *path, enum uio_seg pathseg)
struct vnode *vp;
int vfslocked;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | AUDITVNODE1 | MPSAFE,
pathseg, path, td);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | AUDITVNODE1 |
MPSAFE, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
vfslocked = NDHASGIANT(&nd);
@ -886,8 +886,8 @@ chroot(td, uap)
error = priv_check(td, PRIV_VFS_CHROOT);
if (error)
return (error);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
UIO_USERSPACE, uap->path, td);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
AUDITVNODE1, UIO_USERSPACE, uap->path, td);
error = namei(&nd);
if (error)
goto error;
@ -1938,7 +1938,7 @@ lseek(td, uap)
offset += fp->f_offset;
break;
case L_XTND:
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(vp, LK_SHARED | LK_RETRY);
error = VOP_GETATTR(vp, &vattr, cred);
VOP_UNLOCK(vp, 0);
if (error)
@ -2125,8 +2125,8 @@ kern_accessat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
td->td_ucred = tmpcred;
} else
cred = tmpcred = td->td_ucred;
NDINIT_AT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
pathseg, path, fd, td);
NDINIT_AT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
AUDITVNODE1, pathseg, path, fd, td);
if ((error = namei(&nd)) != 0)
goto out1;
vfslocked = NDHASGIANT(&nd);
@ -2492,8 +2492,8 @@ kern_pathconf(struct thread *td, char *path, enum uio_seg pathseg, int name)
struct nameidata nd;
int error, vfslocked;
NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
pathseg, path, td);
NDINIT(&nd, LOOKUP, FOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
AUDITVNODE1, pathseg, path, td);
if ((error = namei(&nd)) != 0)
return (error);
vfslocked = NDHASGIANT(&nd);
@ -2568,8 +2568,8 @@ kern_readlinkat(struct thread *td, int fd, char *path, enum uio_seg pathseg,
struct nameidata nd;
int vfslocked;
NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | MPSAFE | AUDITVNODE1,
pathseg, path, fd, td);
NDINIT_AT(&nd, LOOKUP, NOFOLLOW | LOCKSHARED | LOCKLEAF | MPSAFE |
AUDITVNODE1, pathseg, path, fd, td);
if ((error = namei(&nd)) != 0)
return (error);

2
sys/kern/vfs_vnops.c
View file

@ -673,7 +673,7 @@ vn_statfile(fp, sb, active_cred, td)
int error;
vfslocked = VFS_LOCK_GIANT(vp->v_mount);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
vn_lock(vp, LK_SHARED | LK_RETRY);
error = vn_stat(vp, sb, active_cred, fp->f_cred, td);
VOP_UNLOCK(vp, 0);
VFS_UNLOCK_GIANT(vfslocked);