596 lines
12 KiB
C
596 lines
12 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "xfs.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir.h"
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#include "xfs_dir2.h"
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#include "xfs_trans.h"
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#include "xfs_dmapi.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_alloc.h"
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#include "xfs_btree.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dir_sf.h"
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#include "xfs_dir2_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_error.h"
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#include "xfs_rw.h"
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#include "xfs_ioctl32.h"
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#include <linux/dcache.h>
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#include <linux/smp_lock.h>
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static struct vm_operations_struct linvfs_file_vm_ops;
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#ifdef CONFIG_XFS_DMAPI
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static struct vm_operations_struct linvfs_dmapi_file_vm_ops;
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#endif
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STATIC inline ssize_t
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__linvfs_read(
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struct kiocb *iocb,
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char __user *buf,
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int ioflags,
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size_t count,
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loff_t pos)
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{
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struct iovec iov = {buf, count};
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struct file *file = iocb->ki_filp;
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vnode_t *vp = LINVFS_GET_VP(file->f_dentry->d_inode);
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ssize_t rval;
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BUG_ON(iocb->ki_pos != pos);
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if (unlikely(file->f_flags & O_DIRECT))
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ioflags |= IO_ISDIRECT;
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VOP_READ(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
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return rval;
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}
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STATIC ssize_t
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linvfs_aio_read(
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struct kiocb *iocb,
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char __user *buf,
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size_t count,
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loff_t pos)
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{
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return __linvfs_read(iocb, buf, IO_ISAIO, count, pos);
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}
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STATIC ssize_t
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linvfs_aio_read_invis(
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struct kiocb *iocb,
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char __user *buf,
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size_t count,
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loff_t pos)
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{
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return __linvfs_read(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
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}
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STATIC inline ssize_t
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__linvfs_write(
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struct kiocb *iocb,
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const char __user *buf,
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int ioflags,
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size_t count,
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loff_t pos)
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{
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struct iovec iov = {(void __user *)buf, count};
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struct file *file = iocb->ki_filp;
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struct inode *inode = file->f_mapping->host;
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vnode_t *vp = LINVFS_GET_VP(inode);
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ssize_t rval;
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BUG_ON(iocb->ki_pos != pos);
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if (unlikely(file->f_flags & O_DIRECT))
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ioflags |= IO_ISDIRECT;
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VOP_WRITE(vp, iocb, &iov, 1, &iocb->ki_pos, ioflags, NULL, rval);
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return rval;
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}
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STATIC ssize_t
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linvfs_aio_write(
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struct kiocb *iocb,
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const char __user *buf,
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size_t count,
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loff_t pos)
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{
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return __linvfs_write(iocb, buf, IO_ISAIO, count, pos);
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}
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STATIC ssize_t
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linvfs_aio_write_invis(
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struct kiocb *iocb,
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const char __user *buf,
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size_t count,
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loff_t pos)
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{
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return __linvfs_write(iocb, buf, IO_ISAIO|IO_INVIS, count, pos);
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}
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STATIC inline ssize_t
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__linvfs_readv(
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struct file *file,
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const struct iovec *iov,
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int ioflags,
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unsigned long nr_segs,
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loff_t *ppos)
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{
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struct inode *inode = file->f_mapping->host;
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vnode_t *vp = LINVFS_GET_VP(inode);
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struct kiocb kiocb;
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ssize_t rval;
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init_sync_kiocb(&kiocb, file);
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kiocb.ki_pos = *ppos;
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if (unlikely(file->f_flags & O_DIRECT))
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ioflags |= IO_ISDIRECT;
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VOP_READ(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);
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*ppos = kiocb.ki_pos;
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return rval;
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}
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STATIC ssize_t
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linvfs_readv(
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struct file *file,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t *ppos)
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{
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return __linvfs_readv(file, iov, 0, nr_segs, ppos);
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}
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STATIC ssize_t
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linvfs_readv_invis(
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struct file *file,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t *ppos)
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{
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return __linvfs_readv(file, iov, IO_INVIS, nr_segs, ppos);
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}
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STATIC inline ssize_t
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__linvfs_writev(
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struct file *file,
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const struct iovec *iov,
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int ioflags,
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unsigned long nr_segs,
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loff_t *ppos)
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{
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struct inode *inode = file->f_mapping->host;
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vnode_t *vp = LINVFS_GET_VP(inode);
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struct kiocb kiocb;
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ssize_t rval;
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init_sync_kiocb(&kiocb, file);
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kiocb.ki_pos = *ppos;
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if (unlikely(file->f_flags & O_DIRECT))
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ioflags |= IO_ISDIRECT;
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VOP_WRITE(vp, &kiocb, iov, nr_segs, &kiocb.ki_pos, ioflags, NULL, rval);
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*ppos = kiocb.ki_pos;
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return rval;
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}
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STATIC ssize_t
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linvfs_writev(
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struct file *file,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t *ppos)
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{
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return __linvfs_writev(file, iov, 0, nr_segs, ppos);
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}
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STATIC ssize_t
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linvfs_writev_invis(
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struct file *file,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t *ppos)
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{
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return __linvfs_writev(file, iov, IO_INVIS, nr_segs, ppos);
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}
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STATIC ssize_t
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linvfs_sendfile(
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struct file *filp,
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loff_t *ppos,
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size_t count,
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read_actor_t actor,
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void *target)
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{
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vnode_t *vp = LINVFS_GET_VP(filp->f_dentry->d_inode);
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ssize_t rval;
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VOP_SENDFILE(vp, filp, ppos, 0, count, actor, target, NULL, rval);
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return rval;
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}
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STATIC int
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linvfs_open(
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struct inode *inode,
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struct file *filp)
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{
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vnode_t *vp = LINVFS_GET_VP(inode);
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int error;
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if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
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return -EFBIG;
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ASSERT(vp);
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VOP_OPEN(vp, NULL, error);
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return -error;
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}
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STATIC int
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linvfs_release(
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struct inode *inode,
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struct file *filp)
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{
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vnode_t *vp = LINVFS_GET_VP(inode);
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int error = 0;
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if (vp)
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VOP_RELEASE(vp, error);
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return -error;
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}
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STATIC int
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linvfs_fsync(
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struct file *filp,
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struct dentry *dentry,
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int datasync)
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{
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struct inode *inode = dentry->d_inode;
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vnode_t *vp = LINVFS_GET_VP(inode);
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int error;
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int flags = FSYNC_WAIT;
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if (datasync)
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flags |= FSYNC_DATA;
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ASSERT(vp);
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VOP_FSYNC(vp, flags, NULL, (xfs_off_t)0, (xfs_off_t)-1, error);
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return -error;
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}
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/*
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* linvfs_readdir maps to VOP_READDIR().
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* We need to build a uio, cred, ...
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*/
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#define nextdp(dp) ((struct xfs_dirent *)((char *)(dp) + (dp)->d_reclen))
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#ifdef CONFIG_XFS_DMAPI
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STATIC struct page *
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linvfs_filemap_nopage(
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struct vm_area_struct *area,
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unsigned long address,
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int *type)
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{
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struct inode *inode = area->vm_file->f_dentry->d_inode;
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vnode_t *vp = LINVFS_GET_VP(inode);
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xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
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int error;
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ASSERT_ALWAYS(vp->v_vfsp->vfs_flag & VFS_DMI);
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error = XFS_SEND_MMAP(mp, area, 0);
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if (error)
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return NULL;
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return filemap_nopage(area, address, type);
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}
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#endif /* CONFIG_XFS_DMAPI */
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STATIC int
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linvfs_readdir(
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struct file *filp,
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void *dirent,
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filldir_t filldir)
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{
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int error = 0;
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vnode_t *vp;
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uio_t uio;
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iovec_t iov;
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int eof = 0;
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caddr_t read_buf;
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int namelen, size = 0;
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size_t rlen = PAGE_CACHE_SIZE;
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xfs_off_t start_offset, curr_offset;
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xfs_dirent_t *dbp = NULL;
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vp = LINVFS_GET_VP(filp->f_dentry->d_inode);
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ASSERT(vp);
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/* Try fairly hard to get memory */
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do {
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if ((read_buf = (caddr_t)kmalloc(rlen, GFP_KERNEL)))
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break;
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rlen >>= 1;
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} while (rlen >= 1024);
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if (read_buf == NULL)
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return -ENOMEM;
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uio.uio_iov = &iov;
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uio.uio_segflg = UIO_SYSSPACE;
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curr_offset = filp->f_pos;
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if (filp->f_pos != 0x7fffffff)
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uio.uio_offset = filp->f_pos;
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else
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uio.uio_offset = 0xffffffff;
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while (!eof) {
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uio.uio_resid = iov.iov_len = rlen;
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iov.iov_base = read_buf;
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uio.uio_iovcnt = 1;
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start_offset = uio.uio_offset;
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VOP_READDIR(vp, &uio, NULL, &eof, error);
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if ((uio.uio_offset == start_offset) || error) {
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size = 0;
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break;
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}
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size = rlen - uio.uio_resid;
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dbp = (xfs_dirent_t *)read_buf;
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while (size > 0) {
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namelen = strlen(dbp->d_name);
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if (filldir(dirent, dbp->d_name, namelen,
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(loff_t) curr_offset & 0x7fffffff,
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(ino_t) dbp->d_ino,
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DT_UNKNOWN)) {
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goto done;
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}
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size -= dbp->d_reclen;
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curr_offset = (loff_t)dbp->d_off /* & 0x7fffffff */;
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dbp = nextdp(dbp);
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}
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}
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done:
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if (!error) {
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if (size == 0)
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filp->f_pos = uio.uio_offset & 0x7fffffff;
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else if (dbp)
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filp->f_pos = curr_offset;
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}
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kfree(read_buf);
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return -error;
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}
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STATIC int
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linvfs_file_mmap(
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struct file *filp,
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struct vm_area_struct *vma)
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{
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struct inode *ip = filp->f_dentry->d_inode;
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vnode_t *vp = LINVFS_GET_VP(ip);
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vattr_t va = { .va_mask = XFS_AT_UPDATIME };
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int error;
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vma->vm_ops = &linvfs_file_vm_ops;
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#ifdef CONFIG_XFS_DMAPI
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if (vp->v_vfsp->vfs_flag & VFS_DMI) {
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vma->vm_ops = &linvfs_dmapi_file_vm_ops;
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}
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#endif /* CONFIG_XFS_DMAPI */
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VOP_SETATTR(vp, &va, XFS_AT_UPDATIME, NULL, error);
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if (!error)
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vn_revalidate(vp); /* update Linux inode flags */
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return 0;
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}
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STATIC long
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linvfs_ioctl(
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struct file *filp,
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unsigned int cmd,
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unsigned long arg)
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{
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int error;
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struct inode *inode = filp->f_dentry->d_inode;
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vnode_t *vp = LINVFS_GET_VP(inode);
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VOP_IOCTL(vp, inode, filp, 0, cmd, (void __user *)arg, error);
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VMODIFY(vp);
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/* NOTE: some of the ioctl's return positive #'s as a
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* byte count indicating success, such as
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* readlink_by_handle. So we don't "sign flip"
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* like most other routines. This means true
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* errors need to be returned as a negative value.
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*/
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return error;
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}
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STATIC long
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linvfs_ioctl_invis(
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struct file *filp,
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unsigned int cmd,
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unsigned long arg)
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{
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int error;
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struct inode *inode = filp->f_dentry->d_inode;
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vnode_t *vp = LINVFS_GET_VP(inode);
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ASSERT(vp);
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VOP_IOCTL(vp, inode, filp, IO_INVIS, cmd, (void __user *)arg, error);
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VMODIFY(vp);
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/* NOTE: some of the ioctl's return positive #'s as a
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* byte count indicating success, such as
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* readlink_by_handle. So we don't "sign flip"
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* like most other routines. This means true
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* errors need to be returned as a negative value.
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*/
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return error;
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}
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#ifdef CONFIG_XFS_DMAPI
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#ifdef HAVE_VMOP_MPROTECT
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STATIC int
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linvfs_mprotect(
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struct vm_area_struct *vma,
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unsigned int newflags)
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{
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vnode_t *vp = LINVFS_GET_VP(vma->vm_file->f_dentry->d_inode);
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int error = 0;
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if (vp->v_vfsp->vfs_flag & VFS_DMI) {
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if ((vma->vm_flags & VM_MAYSHARE) &&
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(newflags & VM_WRITE) && !(vma->vm_flags & VM_WRITE)) {
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xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
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error = XFS_SEND_MMAP(mp, vma, VM_WRITE);
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}
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}
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return error;
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}
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#endif /* HAVE_VMOP_MPROTECT */
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#endif /* CONFIG_XFS_DMAPI */
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#ifdef HAVE_FOP_OPEN_EXEC
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/* If the user is attempting to execute a file that is offline then
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* we have to trigger a DMAPI READ event before the file is marked as busy
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* otherwise the invisible I/O will not be able to write to the file to bring
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* it back online.
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*/
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STATIC int
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linvfs_open_exec(
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struct inode *inode)
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{
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vnode_t *vp = LINVFS_GET_VP(inode);
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xfs_mount_t *mp = XFS_VFSTOM(vp->v_vfsp);
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int error = 0;
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xfs_inode_t *ip;
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if (vp->v_vfsp->vfs_flag & VFS_DMI) {
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ip = xfs_vtoi(vp);
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if (!ip) {
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error = -EINVAL;
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goto open_exec_out;
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}
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if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)) {
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error = -XFS_SEND_DATA(mp, DM_EVENT_READ, vp,
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0, 0, 0, NULL);
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}
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}
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open_exec_out:
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return error;
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}
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#endif /* HAVE_FOP_OPEN_EXEC */
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struct file_operations linvfs_file_operations = {
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.llseek = generic_file_llseek,
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.readv = linvfs_readv,
|
|
.writev = linvfs_writev,
|
|
.aio_read = linvfs_aio_read,
|
|
.aio_write = linvfs_aio_write,
|
|
.sendfile = linvfs_sendfile,
|
|
.unlocked_ioctl = linvfs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = linvfs_compat_ioctl,
|
|
#endif
|
|
.mmap = linvfs_file_mmap,
|
|
.open = linvfs_open,
|
|
.release = linvfs_release,
|
|
.fsync = linvfs_fsync,
|
|
#ifdef HAVE_FOP_OPEN_EXEC
|
|
.open_exec = linvfs_open_exec,
|
|
#endif
|
|
};
|
|
|
|
struct file_operations linvfs_invis_file_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.read = do_sync_read,
|
|
.write = do_sync_write,
|
|
.readv = linvfs_readv_invis,
|
|
.writev = linvfs_writev_invis,
|
|
.aio_read = linvfs_aio_read_invis,
|
|
.aio_write = linvfs_aio_write_invis,
|
|
.sendfile = linvfs_sendfile,
|
|
.unlocked_ioctl = linvfs_ioctl_invis,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = linvfs_compat_invis_ioctl,
|
|
#endif
|
|
.mmap = linvfs_file_mmap,
|
|
.open = linvfs_open,
|
|
.release = linvfs_release,
|
|
.fsync = linvfs_fsync,
|
|
};
|
|
|
|
|
|
struct file_operations linvfs_dir_operations = {
|
|
.read = generic_read_dir,
|
|
.readdir = linvfs_readdir,
|
|
.unlocked_ioctl = linvfs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = linvfs_compat_ioctl,
|
|
#endif
|
|
.fsync = linvfs_fsync,
|
|
};
|
|
|
|
static struct vm_operations_struct linvfs_file_vm_ops = {
|
|
.nopage = filemap_nopage,
|
|
.populate = filemap_populate,
|
|
};
|
|
|
|
#ifdef CONFIG_XFS_DMAPI
|
|
static struct vm_operations_struct linvfs_dmapi_file_vm_ops = {
|
|
.nopage = linvfs_filemap_nopage,
|
|
.populate = filemap_populate,
|
|
#ifdef HAVE_VMOP_MPROTECT
|
|
.mprotect = linvfs_mprotect,
|
|
#endif
|
|
};
|
|
#endif /* CONFIG_XFS_DMAPI */
|