310 lines
7.9 KiB
C
310 lines
7.9 KiB
C
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#include <defs.h>
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#include <stdio.h>
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#include <string.h>
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#include <vfs.h>
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#include <dev.h>
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#include <inode.h>
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#include <sem.h>
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#include <list.h>
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#include <kmalloc.h>
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#include <unistd.h>
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#include <error.h>
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#include <assert.h>
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// device info entry in vdev_list
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typedef struct {
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const char *devname;
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struct inode *devnode;
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struct fs *fs;
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bool mountable;
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list_entry_t vdev_link;
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} vfs_dev_t;
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#define le2vdev(le, member) \
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to_struct((le), vfs_dev_t, member)
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static list_entry_t vdev_list; // device info list in vfs layer
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static semaphore_t vdev_list_sem;
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static void
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lock_vdev_list(void) {
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down(&vdev_list_sem);
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}
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static void
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unlock_vdev_list(void) {
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up(&vdev_list_sem);
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}
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void
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vfs_devlist_init(void) {
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list_init(&vdev_list);
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sem_init(&vdev_list_sem, 1);
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}
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// vfs_cleanup - finally clean (or sync) fs
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void
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vfs_cleanup(void) {
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if (!list_empty(&vdev_list)) {
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lock_vdev_list();
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{
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list_entry_t *list = &vdev_list, *le = list;
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while ((le = list_next(le)) != list) {
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vfs_dev_t *vdev = le2vdev(le, vdev_link);
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if (vdev->fs != NULL) {
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fsop_cleanup(vdev->fs);
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}
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}
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}
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unlock_vdev_list();
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}
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}
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/*
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* vfs_get_root - Given a device name (stdin, stdout, etc.), hand
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* back an appropriate inode.
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*/
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int
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vfs_get_root(const char *devname, struct inode **node_store) {
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assert(devname != NULL);
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int ret = -E_NO_DEV;
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if (!list_empty(&vdev_list)) {
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lock_vdev_list();
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{
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list_entry_t *list = &vdev_list, *le = list;
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while ((le = list_next(le)) != list) {
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vfs_dev_t *vdev = le2vdev(le, vdev_link);
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if (strcmp(devname, vdev->devname) == 0) {
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struct inode *found = NULL;
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if (vdev->fs != NULL) {
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found = fsop_get_root(vdev->fs);
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}
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else if (!vdev->mountable) {
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vop_ref_inc(vdev->devnode);
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found = vdev->devnode;
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}
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if (found != NULL) {
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ret = 0, *node_store = found;
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}
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else {
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ret = -E_NA_DEV;
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}
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break;
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}
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}
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}
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unlock_vdev_list();
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}
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return ret;
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}
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/*
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* vfs_get_devname - Given a filesystem, hand back the name of the device it's mounted on.
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*/
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const char *
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vfs_get_devname(struct fs *fs) {
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assert(fs != NULL);
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list_entry_t *list = &vdev_list, *le = list;
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while ((le = list_next(le)) != list) {
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vfs_dev_t *vdev = le2vdev(le, vdev_link);
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if (vdev->fs == fs) {
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return vdev->devname;
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}
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}
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return NULL;
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}
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/*
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* check_devname_confilct - Is there alreadily device which has the same name?
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*/
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static bool
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check_devname_conflict(const char *devname) {
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list_entry_t *list = &vdev_list, *le = list;
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while ((le = list_next(le)) != list) {
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vfs_dev_t *vdev = le2vdev(le, vdev_link);
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if (strcmp(vdev->devname, devname) == 0) {
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return 0;
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}
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}
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return 1;
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}
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/*
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* vfs_do_add - Add a new device to the VFS layer's device table.
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*
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* If "mountable" is set, the device will be treated as one that expects
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* to have a filesystem mounted on it, and a raw device will be created
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* for direct access.
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*/
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static int
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vfs_do_add(const char *devname, struct inode *devnode, struct fs *fs, bool mountable) {
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assert(devname != NULL);
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assert((devnode == NULL && !mountable) || (devnode != NULL && check_inode_type(devnode, device)));
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if (strlen(devname) > FS_MAX_DNAME_LEN) {
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return -E_TOO_BIG;
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}
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int ret = -E_NO_MEM;
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char *s_devname;
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if ((s_devname = strdup(devname)) == NULL) {
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return ret;
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}
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vfs_dev_t *vdev;
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if ((vdev = kmalloc(sizeof(vfs_dev_t))) == NULL) {
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goto failed_cleanup_name;
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}
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ret = -E_EXISTS;
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lock_vdev_list();
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if (!check_devname_conflict(s_devname)) {
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unlock_vdev_list();
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goto failed_cleanup_vdev;
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}
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vdev->devname = s_devname;
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vdev->devnode = devnode;
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vdev->mountable = mountable;
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vdev->fs = fs;
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list_add(&vdev_list, &(vdev->vdev_link));
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unlock_vdev_list();
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return 0;
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failed_cleanup_vdev:
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kfree(vdev);
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failed_cleanup_name:
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kfree(s_devname);
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return ret;
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}
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/*
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* vfs_add_fs - Add a new fs, by name. See vfs_do_add information for the description of
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* mountable.
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*/
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int
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vfs_add_fs(const char *devname, struct fs *fs) {
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return vfs_do_add(devname, NULL, fs, 0);
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}
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/*
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* vfs_add_dev - Add a new device, by name. See vfs_do_add information for the description of
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* mountable.
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*/
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int
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vfs_add_dev(const char *devname, struct inode *devnode, bool mountable) {
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return vfs_do_add(devname, devnode, NULL, mountable);
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}
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/*
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* find_mount - Look for a mountable device named DEVNAME.
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* Should already hold vdev_list lock.
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*/
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static int
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find_mount(const char *devname, vfs_dev_t **vdev_store) {
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assert(devname != NULL);
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list_entry_t *list = &vdev_list, *le = list;
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while ((le = list_next(le)) != list) {
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vfs_dev_t *vdev = le2vdev(le, vdev_link);
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if (vdev->mountable && strcmp(vdev->devname, devname) == 0) {
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*vdev_store = vdev;
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return 0;
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}
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}
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return -E_NO_DEV;
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}
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/*
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* vfs_mount - Mount a filesystem. Once we've found the device, call MOUNTFUNC to
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* set up the filesystem and hand back a struct fs.
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*
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* The DATA argument is passed through unchanged to MOUNTFUNC.
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*/
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int
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vfs_mount(const char *devname, int (*mountfunc)(struct device *dev, struct fs **fs_store)) {
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int ret;
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lock_vdev_list();
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vfs_dev_t *vdev;
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if ((ret = find_mount(devname, &vdev)) != 0) {
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goto out;
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}
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if (vdev->fs != NULL) {
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ret = -E_BUSY;
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goto out;
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}
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assert(vdev->devname != NULL && vdev->mountable);
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struct device *dev = vop_info(vdev->devnode, device);
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if ((ret = mountfunc(dev, &(vdev->fs))) == 0) {
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assert(vdev->fs != NULL);
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cprintf("vfs: mount %s.\n", vdev->devname);
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}
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out:
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unlock_vdev_list();
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return ret;
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}
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/*
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* vfs_unmount - Unmount a filesystem/device by name.
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* First calls FSOP_SYNC on the filesystem; then calls FSOP_UNMOUNT.
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*/
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int
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vfs_unmount(const char *devname) {
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int ret;
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lock_vdev_list();
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vfs_dev_t *vdev;
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if ((ret = find_mount(devname, &vdev)) != 0) {
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goto out;
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}
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if (vdev->fs == NULL) {
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ret = -E_INVAL;
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goto out;
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}
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assert(vdev->devname != NULL && vdev->mountable);
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if ((ret = fsop_sync(vdev->fs)) != 0) {
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goto out;
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}
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if ((ret = fsop_unmount(vdev->fs)) == 0) {
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vdev->fs = NULL;
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cprintf("vfs: unmount %s.\n", vdev->devname);
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}
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out:
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unlock_vdev_list();
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return ret;
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}
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/*
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* vfs_unmount_all - Global unmount function.
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*/
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int
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vfs_unmount_all(void) {
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if (!list_empty(&vdev_list)) {
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lock_vdev_list();
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{
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list_entry_t *list = &vdev_list, *le = list;
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while ((le = list_next(le)) != list) {
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vfs_dev_t *vdev = le2vdev(le, vdev_link);
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if (vdev->mountable && vdev->fs != NULL) {
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int ret;
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if ((ret = fsop_sync(vdev->fs)) != 0) {
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cprintf("vfs: warning: sync failed for %s: %e.\n", vdev->devname, ret);
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continue ;
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}
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if ((ret = fsop_unmount(vdev->fs)) != 0) {
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cprintf("vfs: warning: unmount failed for %s: %e.\n", vdev->devname, ret);
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continue ;
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}
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vdev->fs = NULL;
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cprintf("vfs: unmount %s.\n", vdev->devname);
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}
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}
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}
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unlock_vdev_list();
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}
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return 0;
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}
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