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vmmcache: redo how vnode locking is expected

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Matheus
2024-09-18 18:03:07 -03:00
parent 216a2e8d01
commit d5a4f2a4ad
6 changed files with 44 additions and 25 deletions
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kernel-src/sys/syscalls/open.c
+13 -14
View File
@@ -43,14 +43,14 @@ syscallret_t syscall_openat(context_t *context, int dirfd, char *path, int flags
int newfd;
ret.errno = fd_new(flags & O_CLOEXEC, &newfile, &newfd);
if (ret.errno)
goto cleanup_nounlock;
goto cleanup;
vnode_t *vnode = NULL;
ret.errno = vfs_open(dirnode, pathbuf, fileflagstovnodeflags(flags), &vnode);
if (ret.errno == 0 && (flags & O_CREAT) && (flags & O_EXCL)) {
// exclusive and file already exists
ret.errno = EEXIST;
goto cleanup_nounlock;
goto cleanup;
} else if (ret.errno == ENOENT && (flags & O_CREAT)) {
// create file
vattr_t attr = {
@@ -62,12 +62,7 @@ syscallret_t syscall_openat(context_t *context, int dirfd, char *path, int flags
ret.errno = vfs_create(dirnode, pathbuf, &attr, V_TYPE_REGULAR, &vnode);
if (ret.errno == EEXIST && (flags & O_EXCL) == 0)
goto retry_open;
} else if (ret.errno) {
// any other error
goto cleanup_nounlock;
} else {
// success, lock file
VOP_LOCK(vnode);
VOP_UNLOCK(vnode);
}
if (ret.errno)
@@ -79,12 +74,22 @@ syscallret_t syscall_openat(context_t *context, int dirfd, char *path, int flags
}
vattr_t attr;
VOP_LOCK(vnode);
ret.errno = VOP_GETATTR(vnode, &attr, &current_thread()->proc->cred);
VOP_UNLOCK(vnode);
if (ret.errno)
goto cleanup;
if (vnode->type == V_TYPE_REGULAR && (flags & O_TRUNC) && (flags & FILE_WRITE)) {
MUTEX_ACQUIRE(&vnode->size_lock, false);
VOP_LOCK(vnode);
ret.errno = VOP_RESIZE(vnode, 0, &current_thread()->proc->cred);
VOP_UNLOCK(vnode);
MUTEX_RELEASE(&vnode->size_lock);
if (ret.errno)
goto cleanup;
}
@@ -99,11 +104,6 @@ syscallret_t syscall_openat(context_t *context, int dirfd, char *path, int flags
ret.ret = newfd;
cleanup:
if (vnode)
VOP_UNLOCK(vnode);
cleanup_nounlock:
if (vnode && ret.errno) {
vfs_close(vnode, fileflagstovnodeflags(flags));
VOP_RELEASE(vnode);
@@ -112,7 +112,6 @@ syscallret_t syscall_openat(context_t *context, int dirfd, char *path, int flags
if (newfile && ret.errno)
__assert(fd_close(newfd) == 0);
if (pathbuf)
free(pathbuf);
kernel-src/sys/syscalls/truncate.c
+4
View File
@@ -17,9 +17,13 @@ syscallret_t syscall_ftruncate(int fd, size_t size) {
goto cleanup;
}
MUTEX_ACQUIRE(&file->vnode->size_lock, false);
VOP_LOCK(file->vnode);
ret.errno = VOP_RESIZE(file->vnode, size, &current_thread()->proc->cred);
VOP_UNLOCK(file->vnode);
MUTEX_RELEASE(&file->vnode->size_lock);
ret.ret = ret.errno ? -1 : 0;