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fd: change allocation to add a lowest fd option

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Matheus
2022-09-23 19:37:25 -03:00
parent ff6999aa81
commit 67c9a04d58
4 changed files with 19 additions and 16 deletions
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src/fs/fd.c
+14 -10
View File
@@ -4,8 +4,6 @@
#include <kernel/alloc.h> #include <kernel/alloc.h>
#include <string.h> #include <string.h>
// XXX limit the max fd number
int fd_release(fd_t* fd){ int fd_release(fd_t* fd){
spinlock_release(&fd->lock); spinlock_release(&fd->lock);
return 0; return 0;
@@ -28,16 +26,19 @@ int fd_access(fdtable_t* fdtable, fd_t** fd, int ifd){
} }
int fd_alloc(fdtable_t* fdtable, fd_t** fd, int* ifd){ int fd_alloc(fdtable_t* fdtable, fd_t** fd, int* ifd, int lowest){
if(lowest >= MAX_FD){
return EBADF;
}
spinlock_acquire(&fdtable->lock); spinlock_acquire(&fdtable->lock);
// find fd to use // find fd to use
bool ok = false; bool ok = false;
for(uintmax_t i = fdtable->firstfreefd; i < fdtable->fdcount; ++i){ for(uintmax_t i = lowest; i < fdtable->fdcount; ++i){
if(!fdtable->fd[i]){ if(!fdtable->fd[i]){
fdtable->firstfreefd = i;
*ifd = i; *ifd = i;
ok = true; ok = true;
break; break;
@@ -46,12 +47,16 @@ int fd_alloc(fdtable_t* fdtable, fd_t** fd, int* ifd){
// resize table // resize table
int targetfd = fdtable->fdcount > lowest ? fdtable->fdcount : lowest;
if(!ok){ if(!ok){
if(fdtable->fdcount == MAX_FD){ if(fdtable->fdcount == MAX_FD){
spinlock_release(&fdtable->lock); spinlock_release(&fdtable->lock);
return EMFILE; return EMFILE;
} }
fd_t** tmp = realloc(fdtable->fd, sizeof(fd_t*)*(fdtable->fdcount + 1));
fd_t** tmp = realloc(fdtable->fd, sizeof(fd_t*)*(targetfd + 1));
if(!tmp){ if(!tmp){
spinlock_release(&fdtable->lock); spinlock_release(&fdtable->lock);
@@ -59,8 +64,8 @@ int fd_alloc(fdtable_t* fdtable, fd_t** fd, int* ifd){
} }
fdtable->fd = tmp; fdtable->fd = tmp;
*ifd = fdtable->fdcount; *ifd = targetfd;
++fdtable->fdcount; fdtable->fdcount = targetfd + 1;
} }
@@ -197,7 +202,7 @@ int fd_duplicate(fdtable_t* table, int src, int dest, int type, int* ret){
} }
if(type == 1){ // allocate for dup if(type == 1){ // allocate for dup
err = fd_alloc(table, &destfd, &dest); err = fd_alloc(table, &destfd, &dest, dest); // for fcntl F_DUPFD, dest is the lowest fd
if(err){ if(err){
fd_release(srcfd); fd_release(srcfd);
return err; return err;
@@ -226,7 +231,6 @@ int fd_duplicate(fdtable_t* table, int src, int dest, int type, int* ret){
if(destfd){ if(destfd){
spinlock_acquire(&destfd->lock); spinlock_acquire(&destfd->lock);
if(--destfd->refcount == 0){ if(--destfd->refcount == 0){
printf("killing\n");
if(destfd->node) vfs_close(destfd->node); if(destfd->node) vfs_close(destfd->node);
free(destfd); free(destfd);
} }
src/include/kernel/fd.h
+1 -2
View File
@@ -46,11 +46,10 @@ typedef struct {
typedef struct { typedef struct {
int lock; int lock;
size_t fdcount; size_t fdcount;
uintmax_t firstfreefd;
fd_t** fd; fd_t** fd;
} fdtable_t; } fdtable_t;
int fd_alloc(fdtable_t* fdtable, fd_t** fd, int* ifd); int fd_alloc(fdtable_t* fdtable, fd_t** fd, int* ifd, int lowest);
int fd_free(fdtable_t* fdtable, int ifd); int fd_free(fdtable_t* fdtable, int ifd);
int fd_access(fdtable_t* fdtable, fd_t** fd, int ifd); int fd_access(fdtable_t* fdtable, fd_t** fd, int ifd);
int fd_release(fd_t* fd); int fd_release(fd_t* fd);
src/sys/sched/scheduler.c
+3 -3
View File
@@ -417,9 +417,9 @@ void sched_runinit(){
fd_t *stdinfd, *stdoutfd, *stderrfd; fd_t *stdinfd, *stdoutfd, *stderrfd;
fd_alloc(&proc->fdtable, &stdinfd, &tmp); fd_alloc(&proc->fdtable, &stdinfd, &tmp, 0);
fd_alloc(&proc->fdtable, &stdoutfd, &tmp); fd_alloc(&proc->fdtable, &stdoutfd, &tmp, 0);
fd_alloc(&proc->fdtable, &stderrfd, &tmp); fd_alloc(&proc->fdtable, &stderrfd, &tmp, 0);
#define CONSOLE_PATH "dev/console" #define CONSOLE_PATH "dev/console"
src/sys/syscalls/open.c
+1 -1
View File
@@ -32,7 +32,7 @@ syscallret syscall_open(const char* pathname, int flags, mode_t mode){
int ifd; int ifd;
fd_t* fd; fd_t* fd;
int err = fd_alloc(&proc->fdtable, &fd, &ifd); int err = fd_alloc(&proc->fdtable, &fd, &ifd, 0);
if(err){ if(err){
retv.errno = err; retv.errno = err;