minix/servers/ext2/misc.c

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/* Created (MFS based):
* February 2010 (Evgeniy Ivanov)
*/
#include "fs.h"
#include <assert.h>
#include <minix/vfsif.h>
#include <minix/bdev.h>
#include "inode.h"
#include "super.h"
/*===========================================================================*
* fs_sync *
*===========================================================================*/
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int fs_sync()
{
/* Perform the sync() system call. Flush all the tables.
* The order in which the various tables are flushed is critical. The
* blocks must be flushed last, since rw_inode() leaves its results in
* the block cache.
*/
struct inode *rip;
assert(lmfs_nr_bufs() > 0);
if (superblock->s_rd_only)
return(OK); /* nothing to sync */
/* Write all the dirty inodes to the disk. */
for(rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
if(rip->i_count > 0 && rip->i_dirt == IN_DIRTY) rw_inode(rip, WRITING);
lmfs_flushall();
if (superblock->s_dev != NO_DEV) {
superblock->s_wtime = clock_time();
write_super(superblock);
}
return(OK); /* sync() can't fail */
}
/*===========================================================================*
* fs_flush *
*===========================================================================*/
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int fs_flush()
{
/* Flush the blocks of a device from the cache after writing any dirty blocks
* to disk.
*/
dev_t dev = fs_m_in.m_vfs_fs_flush.device;
if(dev == fs_dev) return(EBUSY);
lmfs_flushall();
lmfs_invalidate(dev);
return(OK);
}
/*===========================================================================*
* fs_new_driver *
*===========================================================================*/
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int fs_new_driver(void)
{
/* Set a new driver endpoint for this device. */
dev_t dev;
cp_grant_id_t label_gid;
size_t label_len;
char label[sizeof(fs_dev_label)];
int r;
dev = fs_m_in.m_vfs_fs_new_driver.device;
label_gid = fs_m_in.m_vfs_fs_new_driver.grant;
label_len = fs_m_in.m_vfs_fs_new_driver.path_len;
if (label_len > sizeof(label))
return(EINVAL);
r = sys_safecopyfrom(fs_m_in.m_source, label_gid, (vir_bytes) 0,
(vir_bytes) label, label_len);
if (r != OK) {
printf("ext2: fs_new_driver safecopyfrom failed (%d)\n", r);
return(EINVAL);
}
bdev_driver(dev, label);
return(OK);
}
int fs_bpeek(void)
{
return lmfs_do_bpeek(&fs_m_in);
}