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vfs: redo locking

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Matheus
2024-08-26 21:47:23 -03:00
parent da150523ba
commit 42bda0bf92
32 changed files with 271 additions and 169 deletions
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kernel-src/sys/syscalls/open.c
+13 -7
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@@ -43,16 +43,16 @@ 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;
goto cleanup_nounlock;
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;
return ret;
}
if (ret.errno == ENOENT && (flags & O_CREAT)) {
goto cleanup_nounlock;
} else if (ret.errno == ENOENT && (flags & O_CREAT)) {
// create file
vattr_t attr = {
.mode = UMASK(mode),
.gid = _cpu()->thread->proc->cred.egid,
@@ -62,6 +62,12 @@ 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);
}
if (ret.errno)
@@ -78,9 +84,7 @@ syscallret_t syscall_openat(context_t *context, int dirfd, char *path, int flags
goto cleanup;
if (vnode->type == V_TYPE_REGULAR && (flags & O_TRUNC) && (flags & FILE_WRITE)) {
MUTEX_ACQUIRE(&vnode->sizelock, false);
ret.errno = VOP_RESIZE(vnode, 0, &_cpu()->thread->proc->cred);
MUTEX_RELEASE(&vnode->sizelock);
if (ret.errno)
goto cleanup;
}
@@ -95,6 +99,8 @@ syscallret_t syscall_openat(context_t *context, int dirfd, char *path, int flags
ret.ret = newfd;
cleanup:
VOP_UNLOCK(vnode);
cleanup_nounlock:
if (vnode && ret.errno) {
vfs_close(vnode, fileflagstovnodeflags(flags));
VOP_RELEASE(vnode);