embox

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/**
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 * @file
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 *
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 * @brief
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 *
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 * @date 14.09.2011
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 * @author Anton Bondarev
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 */
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#include <errno.h>
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#include <fcntl.h>
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#include <assert.h>
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#include <sys/stat.h>
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#include <fs/perm.h>
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#include <mem/objalloc.h>
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#include <fs/file_desc.h>
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#include <kernel/task.h>
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#include <kernel/task/resource/idesc_table.h>
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#include <embox/unit.h>
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#include <util/err.h>
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#include <fs/inode.h>
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extern const struct idesc_xattrops file_idesc_xattrops;
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OBJALLOC_DEF(desc_pool, struct file_desc, OPTION_GET(NUMBER,fdesc_quantity));
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static struct file_desc *file_desc_alloc(void) {
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	return objalloc(&desc_pool);
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}
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static void file_desc_free(struct file_desc *desc) {
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	objfree(&desc_pool, desc);
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}
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extern const struct idesc_ops idesc_file_ops;
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struct file_desc *file_desc_create(struct inode *node, int flag) {
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	struct file_desc *desc;
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	int perm_flags;
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	int ret;
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	/* allocate new descriptor */
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	if (NULL == (desc = file_desc_alloc())) {
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		return err2ptr(ENOMEM);
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	}
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	/* setup access mode */
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	perm_flags = 0;
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	if ((flag & O_WRONLY) || (flag & O_RDWR)) {
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		perm_flags |= S_IWOTH;
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	}
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	if (!(flag & O_WRONLY)) {
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		perm_flags |= S_IROTH;
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	}
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	if (0 > (ret = fs_perm_check(node, perm_flags))) {
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		file_desc_free(desc);
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		return err2ptr(EACCES);
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	}
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	desc->f_inode = node;
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	desc->f_pos = 0;
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	idesc_init(&desc->f_idesc, &idesc_file_ops, flag);
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	desc->f_idesc.idesc_xattrops = &file_idesc_xattrops;
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	return desc;
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}
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int file_desc_destroy(struct file_desc *fdesc) {
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	assert(fdesc);
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	inode_del(fdesc->f_inode);
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	file_desc_free(fdesc);
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	return 0;
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}
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struct file_desc *file_desc_get(int idx) {
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	struct idesc *idesc;
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	struct idesc_table *it;
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	assert(idesc_index_valid(idx));
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	it = task_resource_idesc_table(task_self());
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	assert(it);
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	idesc = idesc_table_get(it, idx);
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	assert(idesc);
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	if (idesc->idesc_ops != &idesc_file_ops) {
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		return NULL;
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	}
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	return (struct file_desc *) idesc;
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}
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off_t file_get_pos(struct file_desc * file) {
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	return file->f_pos;
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}
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off_t file_set_pos(struct file_desc *file, off_t off) {
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	file->f_pos = off;
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	return file->f_pos;
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}
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size_t file_get_size(struct file_desc *file) {
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	return file->f_inode->i_size;
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}
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void file_set_size(struct file_desc *file, size_t size) {
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	file->f_inode->i_size = size;
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}
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void *file_get_inode_data(struct file_desc *file) {
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	assert(file->f_inode);
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	return file->f_inode->i_privdata;
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}
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struct file_desc *file_desc_from_idesc(struct idesc *idesc) {
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	return (struct file_desc *)idesc;
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}
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void file_desc_set_file_info(struct file_desc *file, void *fi) {
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	file->file_info = fi;
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}
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