diff options
| -rw-r--r-- | libdiskfs/io-read.c | 85 | ||||
| -rw-r--r-- | libdiskfs/io-write.c | 80 |
2 files changed, 165 insertions, 0 deletions
diff --git a/libdiskfs/io-read.c b/libdiskfs/io-read.c new file mode 100644 index 00000000..e6623457 --- /dev/null +++ b/libdiskfs/io-read.c @@ -0,0 +1,85 @@ +/* + Copyright (C) 1994 Free Software Foundation + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "priv.h" + +/* Implement io_read as described in <hurd/io.defs>. */ +error_t +diskfs_S_io_read (struct protid *cred, + char **data, + unsigned int *datalen, + off_t offset, + int maxread) +{ + struct node *np; + int err; + int off = offset; + char *buf; + int ourbuf = 0; + + if (!cred) + return EOPNOTSUPP; + + np = cred->po->np; + if (!(cred->po->openstat & O_READ)) + return EBADF; + if (maxread < 0) + return EINVAL; + + mutex_lock (&np->i_toplock); + + if (err = ioserver_get_conch (&np->i_conch)) + { + mutex_unlock (&np->i_toplock); + return err; + } + + if (off == -1) + off = cred->po->filepointer; + + if (!(err = catch_exception ())) + { + if (off + maxread > np->di->di_size) + maxread = np->di->di_size - off; + end_catch_exception (); + } + + if (!err) + { + if (maxread > *datalen) + { + ourbuf = 1; + vm_allocate (mach_task_self (), (u_int *) &buf, maxread, 1); + *data = buf; + } + else + buf = *data; + + *datalen = maxread; + if (maxread) + err = io_rdwr (np, buf, off, maxread, 0); + else + err = 0; + if (offset == -1 && !err) + cred->po->filepointer += *datalen; + if (err && ourbuf) + vm_deallocate (mach_task_self (), (u_int) buf, maxread); + } + + mutex_unlock (&np->i_toplock); + return err; +} diff --git a/libdiskfs/io-write.c b/libdiskfs/io-write.c new file mode 100644 index 00000000..3748f539 --- /dev/null +++ b/libdiskfs/io-write.c @@ -0,0 +1,80 @@ +/* + Copyright (C) 1994 Free Software Foundation + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License as + published by the Free Software Foundation; either version 2, or (at + your option) any later version. + + This program is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "priv.h" + +/* Implement io_write as described in <hurd/io.defs>. */ + +/* Implement io_write as described in <hurd/io.defs>. */ +error_t +S_io_write(struct protid *cred, + char *data, + unsigned int datalen, + off_t offset, + int *amt) +{ + struct node *np; + error_t err; + volatile int off = offset; + + if (!cred) + return EOPNOTSUPP; + + np = cred->po->np; + if (!(cred->po->openstat & O_WRITE)) + return EBADF; + if (*amt < 0) + return EINVAL; + + mutex_lock (&np->lock); + + assert (!S_ISDIR(np->dn_stat.st_mode)); + + err = ioserver_get_conch (&np->conch); + if (err) + goto out; + + if (off == -1) + { + if (cred->po->openstat & O_APPEND) + cred->po->filepointer = np->dn_stat.st_size; + off = cred->po->filepointer; + } + + while (off + datalen > np->i_allocsize) + { + err = diskfs_grow (np, off + datalen, cred); + if (err) + goto out; + } + + if (off + datalen > np->dn_stat.st_size) + np->dn_stat.st_size = off + datalen; + + if (!err) + { + *amt = datalen; + err = _diskfs_rdwr_internal (np, data, off, datalen, 1); + + if (offset == -1) + cred->po->filepointer += *amt; + } + + out: + mutex_unlock (&np->i_toplock); + return err; +} |