44f34e53d5
This commit introduces a new request type called REQ_BPEEK. It requests minor device blocks from the FS. Analogously to REQ_PEEK, it requests the filesystem to get the requested blocks into its cache, without actually copying the result anywhere. Change-Id: If1d06645b0e17553a64b3167091e9d12efeb3d6f
87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
#include "fs.h"
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#include <assert.h>
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#include <minix/vfsif.h>
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#include <minix/bdev.h>
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#include "inode.h"
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#include "clean.h"
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/*===========================================================================*
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* fs_sync *
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*===========================================================================*/
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int fs_sync()
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{
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/* Perform the sync() system call. Flush all the tables.
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* The order in which the various tables are flushed is critical. The
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* blocks must be flushed last, since rw_inode() leaves its results in
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* the block cache.
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*/
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struct inode *rip;
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assert(lmfs_nr_bufs() > 0);
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/* Write all the dirty inodes to the disk. */
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for(rip = &inode[0]; rip < &inode[NR_INODES]; rip++)
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if(rip->i_count > 0 && IN_ISDIRTY(rip)) rw_inode(rip, WRITING);
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/* Write all the dirty blocks to the disk. */
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lmfs_flushall();
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return(OK); /* sync() can't fail */
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}
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/*===========================================================================*
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* fs_flush *
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*===========================================================================*/
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int fs_flush()
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{
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/* Flush the blocks of a device from the cache after writing any dirty blocks
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* to disk.
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*/
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dev_t dev = (dev_t) fs_m_in.REQ_DEV;
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if(dev == fs_dev) return(EBUSY);
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lmfs_flushall();
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lmfs_invalidate(dev);
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return(OK);
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}
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/*===========================================================================*
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* fs_new_driver *
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*===========================================================================*/
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int fs_new_driver(void)
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{
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/* Set a new driver endpoint for this device. */
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dev_t dev;
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cp_grant_id_t label_gid;
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size_t label_len;
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char label[sizeof(fs_dev_label)];
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int r;
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dev = (dev_t) fs_m_in.REQ_DEV;
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label_gid = (cp_grant_id_t) fs_m_in.REQ_GRANT;
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label_len = (size_t) fs_m_in.REQ_PATH_LEN;
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if (label_len > sizeof(label))
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return(EINVAL);
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r = sys_safecopyfrom(fs_m_in.m_source, label_gid, (vir_bytes) 0,
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(vir_bytes) label, label_len);
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if (r != OK) {
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printf("MFS: fs_new_driver safecopyfrom failed (%d)\n", r);
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return(EINVAL);
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}
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bdev_driver(dev, label);
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return(OK);
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}
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int fs_bpeek(void)
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{
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return lmfs_do_bpeek(&fs_m_in);
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}
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