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#include <errno.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <assert.h>
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#include <assert.h>
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#include <bool.h>
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#include <bool.h>
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#include <fibril.h>
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#include <fibril_sync.h>
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#include "vfs.h"
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#include "vfs.h"
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/**
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/**
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 * This is a per-connection table of open files.
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 * This is a per-connection table of open files.
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 * Our assumption is that each client opens only one connection and therefore
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 * Our assumption is that each client opens only one connection and therefore
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 *
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 *
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 * Allocation of the open files table is deferred until the client makes the
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 * Allocation of the open files table is deferred until the client makes the
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 * first VFS_OPEN operation.
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 * first VFS_OPEN operation.
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 *
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 *
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 * This resource being per-connection and, in the first place, per-fibril, we
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 * This resource being per-connection and, in the first place, per-fibril, we
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 * don't need to protect it by a futex.
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 * don't need to protect it by a mutex.
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 */
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 */
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__thread vfs_file_t **files = NULL;
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fibril_local vfs_file_t **files = NULL;
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/** Initialize the table of open files. */
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/** Initialize the table of open files. */
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bool vfs_files_init(void)
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bool vfs_files_init(void)
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{
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{
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    if (!files) {
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    if (!files) {
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 * @return      First available file descriptor or a negative error
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 * @return      First available file descriptor or a negative error
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 *          code.
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 *          code.
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 */
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 */
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int vfs_fd_alloc(void)
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int vfs_fd_alloc(void)
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{
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{
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    if (!vfs_files_init())
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    int i;
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        return ENOMEM;
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    unsigned int i;
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    for (i = 0; i < MAX_OPEN_FILES; i++) {
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    for (i = 0; i < MAX_OPEN_FILES; i++) {
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        if (!files[i]) {
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        if (!files[i]) {
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            files[i] = (vfs_file_t *) malloc(sizeof(vfs_file_t));
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            files[i] = (vfs_file_t *) malloc(sizeof(vfs_file_t));
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            if (!files[i])
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            if (!files[i])
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                return ENOMEM;
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                return ENOMEM;
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            memset(files[i], 0, sizeof(vfs_file_t));
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            memset(files[i], 0, sizeof(vfs_file_t));
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            futex_initialize(&files[i]->lock, 1);
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            fibril_mutex_initialize(&files[i]->lock);
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            vfs_file_addref(files[i]);
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            vfs_file_addref(files[i]);
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            return i;
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            return (int) i;
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        }
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        }
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    }
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    }
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    return EMFILE;
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    return EMFILE;
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}
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}
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/** Release file descriptor.
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/** Release file descriptor.
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 *
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 *
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 * @return      EOK on success or EBADF if fd is an invalid file
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 * @return      EOK on success or EBADF if fd is an invalid file
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 *          descriptor.
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 *          descriptor.
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 */
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 */
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int vfs_fd_free(int fd)
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int vfs_fd_free(int fd)
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{
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{
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    if (!vfs_files_init())
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        return ENOMEM;
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    if ((fd < 0) || (fd >= MAX_OPEN_FILES) || (files[fd] == NULL))
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    if ((fd < 0) || (fd >= MAX_OPEN_FILES) || (files[fd] == NULL))
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        return EBADF;
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        return EBADF;
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    vfs_file_delref(files[fd]);
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    vfs_file_delref(files[fd]);
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    files[fd] = NULL;
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    files[fd] = NULL;
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    return EOK;
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    return EOK;
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}
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}
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/** Increment reference count of VFS file structure.
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/** Increment reference count of VFS file structure.
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 *
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 *
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 *
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 *
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 * @return      VFS file structure corresponding to fd.
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 * @return      VFS file structure corresponding to fd.
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 */
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 */
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vfs_file_t *vfs_file_get(int fd)
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vfs_file_t *vfs_file_get(int fd)
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{
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{
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    if (!vfs_files_init())
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        return NULL;
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    if ((fd >= 0) && (fd < MAX_OPEN_FILES))
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    if ((fd >= 0) && (fd < MAX_OPEN_FILES))
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        return files[fd];
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        return files[fd];
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    return NULL;
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    return NULL;
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}
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}
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/**
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/**
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 * @}
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 * @}
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 */
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 */