/* * ufs_fiosdio * Set delayed-io state. This ioctl is tailored * to metamucil's needs and may change at any time. */ int ufs_fiosdio( struct vnode *vp, /* file's vnode */ uint_t *diop, /* dio flag */ int flag, /* flag from ufs_ioctl */ struct cred *cr) /* credentials from ufs_ioctl */ { uint_t dio; /* copy of user's dio */ struct inode *ip; /* inode for vp */ struct ufsvfs *ufsvfsp; struct fs *fs; struct ulockfs *ulp; int error = 0; #ifdef lint flag = flag; #endif /* check input conditions */ if (secpolicy_fs_config(cr, vp->v_vfsp) != 0) return (EPERM); if (copyin(diop, &dio, sizeof (dio))) return (EFAULT); if (dio > 1) return (EINVAL); /* file system has been forcibly unmounted */ if (VTOI(vp)->i_ufsvfs == NULL) return (EIO); ip = VTOI(vp); ufsvfsp = ip->i_ufsvfs; ulp = &ufsvfsp->vfs_ulockfs; /* logging file system; dio ignored */ if (TRANS_ISTRANS(ufsvfsp)) return (error); /* hold the mutex to prevent race with a lockfs request */ vfs_lock_wait(vp->v_vfsp); mutex_enter(&ulp->ul_lock); atomic_inc_ulong(&ufs_quiesce_pend); if (ULOCKFS_IS_HLOCK(ulp)) { error = EIO; goto out; } if (ULOCKFS_IS_ELOCK(ulp)) { error = EBUSY; goto out; } /* wait for outstanding accesses to finish */ if (error = ufs_quiesce(ulp)) goto out; /* flush w/invalidate */ if (error = ufs_flush(vp->v_vfsp)) goto out; /* * update dio */ mutex_enter(&ufsvfsp->vfs_lock); ufsvfsp->vfs_dio = dio; /* * enable/disable clean flag processing */ fs = ip->i_fs; if (fs->fs_ronly == 0 && fs->fs_clean != FSBAD && fs->fs_clean != FSLOG) { if (dio) fs->fs_clean = FSSUSPEND; else fs->fs_clean = FSACTIVE; ufs_sbwrite(ufsvfsp); mutex_exit(&ufsvfsp->vfs_lock); } else mutex_exit(&ufsvfsp->vfs_lock); out: /* * we need this broadcast because of the ufs_quiesce call above */ atomic_dec_ulong(&ufs_quiesce_pend); cv_broadcast(&ulp->ul_cv); mutex_exit(&ulp->ul_lock); vfs_unlock(vp->v_vfsp); return (error); }
/* * ufs_alloc_data - supports allocating space and reads or writes * that involve changes to file length or space allocation. * * This function is more expensive, because of the UFS log transaction, * so ufs_rdwr_data() should be used when space or file length changes * will not occur. * * Inputs: * fdb - A null pointer instructs this function to only allocate * space for the specified offset and length. * An actual fdbuffer instructs this function to perform * the read or write operation. * flags - defaults (zero value) to synchronous write * B_READ - indicates read operation * B_ASYNC - indicates perform operation asynchronously */ int ufs_alloc_data( vnode_t *vnodep, u_offset_t offset, size_t *len, fdbuffer_t *fdbp, int flags, cred_t *credp) { struct inode *ip = VTOI(vnodep); size_t done_len, io_len; int contig; u_offset_t uoff, io_off; int error = 0; /* No error occured */ int offsetn; /* Start point this IO */ int nbytes; /* Number bytes in this IO */ daddr_t bn; struct fs *fs; struct ufsvfs *ufsvfsp = ip->i_ufsvfs; int i_size_changed = 0; u_offset_t old_i_size; struct ulockfs *ulp; int trans_size; int issync; /* UFS Log transaction */ /* synchronous when non-zero */ int io_started = 0; /* No IO started */ uint_t protp = PROT_ALL; ASSERT((flags & B_WRITE) == 0); /* * Obey the lockfs protocol */ error = ufs_lockfs_begin_getpage(ufsvfsp, &ulp, segkmap, 0, &protp); if (error) { if ((fdbp != NULL) && (flags & B_ASYNC)) { fdb_ioerrdone(fdbp, error); } return (error); } if (ulp) { /* * Try to begin a UFS log transaction */ trans_size = TOP_GETPAGE_SIZE(ip); TRANS_TRY_BEGIN_CSYNC(ufsvfsp, issync, TOP_GETPAGE, trans_size, error); if (error == EWOULDBLOCK) { ufs_lockfs_end(ulp); if ((fdbp != NULL) && (flags & B_ASYNC)) { fdb_ioerrdone(fdbp, EDEADLK); } return (EDEADLK); } } uoff = offset; io_off = offset; io_len = *len; done_len = 0; DEBUGF((CE_CONT, "?ufs_alloc: off %llx len %lx size %llx fdb: %p\n", uoff, (io_len - done_len), ip->i_size, (void *)fdbp)); rw_enter(&ip->i_ufsvfs->vfs_dqrwlock, RW_READER); rw_enter(&ip->i_contents, RW_WRITER); ASSERT((ip->i_mode & IFMT) == IFREG); fs = ip->i_fs; while (error == 0 && done_len < io_len) { uoff = (u_offset_t)(io_off + done_len); offsetn = (int)blkoff(fs, uoff); nbytes = (int)MIN(fs->fs_bsize - offsetn, io_len - done_len); DEBUGF((CE_CONT, "?ufs_alloc_data: offset: %llx len %x\n", uoff, nbytes)); if (uoff + nbytes > ip->i_size) { /* * We are extending the length of the file. * bmap is used so that we are sure that * if we need to allocate new blocks, that it * is done here before we up the file size. */ DEBUGF((CE_CONT, "?ufs_alloc_data: grow %llx -> %llx\n", ip->i_size, uoff + nbytes)); error = bmap_write(ip, uoff, (offsetn + nbytes), BI_ALLOC_ONLY, NULL, credp); if (ip->i_flag & (ICHG|IUPD)) ip->i_seq++; if (error) { DEBUGF((CE_CONT, "?ufs_alloc_data: grow " "failed err: %d\n", error)); break; } if (fdbp != NULL) { if (uoff >= ip->i_size) { /* * Desired offset is past end of bytes * in file, so we have a hole. */ fdb_add_hole(fdbp, uoff - offset, nbytes); } else { int contig; buf_t *bp; error = bmap_read(ip, uoff, &bn, &contig); if (error) { break; } contig = ip->i_size - uoff; contig = P2ROUNDUP(contig, DEV_BSIZE); bp = fdb_iosetup(fdbp, uoff - offset, contig, vnodep, flags); bp->b_edev = ip->i_dev; bp->b_dev = cmpdev(ip->i_dev); bp->b_blkno = bn; bp->b_file = ip->i_vnode; bp->b_offset = (offset_t)uoff; if (ufsvfsp->vfs_snapshot) { fssnap_strategy( &ufsvfsp->vfs_snapshot, bp); } else { (void) bdev_strategy(bp); } io_started = 1; lwp_stat_update(LWP_STAT_OUBLK, 1); if ((flags & B_ASYNC) == 0) { error = biowait(bp); fdb_iodone(bp); if (error) { break; } } if (contig > (ip->i_size - uoff)) { contig -= ip->i_size - uoff; fdb_add_hole(fdbp, ip->i_size - offset, contig); } } } i_size_changed = 1; old_i_size = ip->i_size; UFS_SET_ISIZE(uoff + nbytes, ip); TRANS_INODE(ip->i_ufsvfs, ip); /* * file has grown larger than 2GB. Set flag * in superblock to indicate this, if it * is not already set. */ if ((ip->i_size > MAXOFF32_T) && !(fs->fs_flags & FSLARGEFILES)) { ASSERT(ufsvfsp->vfs_lfflags & UFS_LARGEFILES); mutex_enter(&ufsvfsp->vfs_lock); fs->fs_flags |= FSLARGEFILES; ufs_sbwrite(ufsvfsp); mutex_exit(&ufsvfsp->vfs_lock); } } else { /* * The file length is not being extended. */ error = bmap_read(ip, uoff, &bn, &contig); if (error) { DEBUGF((CE_CONT, "?ufs_alloc_data: " "bmap_read err: %d\n", error)); break; } if (bn != UFS_HOLE) { /* * Did not map a hole in the file */ int contig = P2ROUNDUP(nbytes, DEV_BSIZE); buf_t *bp; if (fdbp != NULL) { bp = fdb_iosetup(fdbp, uoff - offset, contig, vnodep, flags); bp->b_edev = ip->i_dev; bp->b_dev = cmpdev(ip->i_dev); bp->b_blkno = bn; bp->b_file = ip->i_vnode; bp->b_offset = (offset_t)uoff; if (ufsvfsp->vfs_snapshot) { fssnap_strategy( &ufsvfsp->vfs_snapshot, bp); } else { (void) bdev_strategy(bp); } io_started = 1; lwp_stat_update(LWP_STAT_OUBLK, 1); if ((flags & B_ASYNC) == 0) { error = biowait(bp); fdb_iodone(bp); if (error) { break; } } } } else { /* * We read a hole in the file. * We have to allocate blocks for the hole. */ error = bmap_write(ip, uoff, (offsetn + nbytes), BI_ALLOC_ONLY, NULL, credp); if (ip->i_flag & (ICHG|IUPD)) ip->i_seq++; if (error) { DEBUGF((CE_CONT, "?ufs_alloc_data: fill" " hole failed error: %d\n", error)); break; } if (fdbp != NULL) { fdb_add_hole(fdbp, uoff - offset, nbytes); } } } done_len += nbytes; } if (error) { if (i_size_changed) { /* * Allocation of the blocks for the file failed. * So truncate the file size back to its original size. */ (void) ufs_itrunc(ip, old_i_size, 0, credp); } } DEBUGF((CE_CONT, "?ufs_alloc: uoff %llx len %lx\n", uoff, (io_len - done_len))); if ((offset + *len) < (NDADDR * fs->fs_bsize)) { *len = (size_t)(roundup(offset + *len, fs->fs_fsize) - offset); } else { *len = (size_t)(roundup(offset + *len, fs->fs_bsize) - offset); } /* * Flush cached pages. * * XXX - There should be no pages involved, since the I/O was performed * through the device strategy routine and the page cache was bypassed. * However, testing has demonstrated that this VOP_PUTPAGE is * necessary. Without this, data might not always be read back as it * was written. * */ (void) VOP_PUTPAGE(vnodep, 0, 0, B_INVAL, credp); rw_exit(&ip->i_contents); rw_exit(&ip->i_ufsvfs->vfs_dqrwlock); if ((fdbp != NULL) && (flags & B_ASYNC)) { /* * Show that no more asynchronous IO will be added */ fdb_ioerrdone(fdbp, error); } if (ulp) { /* * End the UFS Log transaction */ TRANS_END_CSYNC(ufsvfsp, error, issync, TOP_GETPAGE, trans_size); ufs_lockfs_end(ulp); } if (io_started && (flags & B_ASYNC)) { return (0); } else { return (error); } }