4d4be482a4
XFS has a mode called invisble I/O that doesn't update any of the timestamps. It's used for HSM-style applications and exposed through the nasty open by handle ioctl. Instead of doing directly assignment of file operations that set an internal flag for it add a new FMODE_NOCMTIME flag that we can check in the normal file operations. (addition of the generic VFS flag has been ACKed by Al as an interims solution) Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
279 lines
6.8 KiB
C
279 lines
6.8 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_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_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_vnodeops.h"
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#include "xfs_da_btree.h"
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#include "xfs_ioctl.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 xfs_file_vm_ops;
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STATIC ssize_t
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xfs_file_aio_read(
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struct kiocb *iocb,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t pos)
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{
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struct file *file = iocb->ki_filp;
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int ioflags = IO_ISAIO;
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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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if (file->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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return xfs_read(XFS_I(file->f_path.dentry->d_inode), iocb, iov,
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nr_segs, &iocb->ki_pos, ioflags);
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}
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STATIC ssize_t
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xfs_file_aio_write(
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struct kiocb *iocb,
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const struct iovec *iov,
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unsigned long nr_segs,
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loff_t pos)
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{
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struct file *file = iocb->ki_filp;
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int ioflags = IO_ISAIO;
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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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if (file->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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return xfs_write(XFS_I(file->f_mapping->host), iocb, iov, nr_segs,
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&iocb->ki_pos, ioflags);
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}
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STATIC ssize_t
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xfs_file_splice_read(
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struct file *infilp,
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loff_t *ppos,
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struct pipe_inode_info *pipe,
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size_t len,
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unsigned int flags)
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{
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int ioflags = 0;
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if (infilp->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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return xfs_splice_read(XFS_I(infilp->f_path.dentry->d_inode),
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infilp, ppos, pipe, len, flags, ioflags);
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}
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STATIC ssize_t
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xfs_file_splice_write(
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struct pipe_inode_info *pipe,
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struct file *outfilp,
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loff_t *ppos,
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size_t len,
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unsigned int flags)
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{
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int ioflags = 0;
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if (outfilp->f_mode & FMODE_NOCMTIME)
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ioflags |= IO_INVIS;
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return xfs_splice_write(XFS_I(outfilp->f_path.dentry->d_inode),
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pipe, outfilp, ppos, len, flags, ioflags);
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}
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STATIC int
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xfs_file_open(
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struct inode *inode,
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struct file *file)
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{
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if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
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return -EFBIG;
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if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb)))
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return -EIO;
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return 0;
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}
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STATIC int
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xfs_dir_open(
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struct inode *inode,
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struct file *file)
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{
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struct xfs_inode *ip = XFS_I(inode);
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int mode;
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int error;
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error = xfs_file_open(inode, file);
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if (error)
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return error;
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/*
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* If there are any blocks, read-ahead block 0 as we're almost
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* certain to have the next operation be a read there.
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*/
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mode = xfs_ilock_map_shared(ip);
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if (ip->i_d.di_nextents > 0)
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xfs_da_reada_buf(NULL, ip, 0, XFS_DATA_FORK);
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xfs_iunlock(ip, mode);
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return 0;
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}
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STATIC int
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xfs_file_release(
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struct inode *inode,
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struct file *filp)
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{
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return -xfs_release(XFS_I(inode));
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}
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/*
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* We ignore the datasync flag here because a datasync is effectively
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* identical to an fsync. That is, datasync implies that we need to write
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* only the metadata needed to be able to access the data that is written
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* if we crash after the call completes. Hence if we are writing beyond
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* EOF we have to log the inode size change as well, which makes it a
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* full fsync. If we don't write beyond EOF, the inode core will be
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* clean in memory and so we don't need to log the inode, just like
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* fsync.
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*/
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STATIC int
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xfs_file_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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xfs_iflags_clear(XFS_I(dentry->d_inode), XFS_ITRUNCATED);
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return -xfs_fsync(XFS_I(dentry->d_inode));
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}
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STATIC int
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xfs_file_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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struct inode *inode = filp->f_path.dentry->d_inode;
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xfs_inode_t *ip = XFS_I(inode);
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int error;
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size_t bufsize;
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/*
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* The Linux API doesn't pass down the total size of the buffer
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* we read into down to the filesystem. With the filldir concept
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* it's not needed for correct information, but the XFS dir2 leaf
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* code wants an estimate of the buffer size to calculate it's
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* readahead window and size the buffers used for mapping to
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* physical blocks.
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*
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* Try to give it an estimate that's good enough, maybe at some
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* point we can change the ->readdir prototype to include the
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* buffer size.
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*/
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bufsize = (size_t)min_t(loff_t, PAGE_SIZE, inode->i_size);
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error = xfs_readdir(ip, dirent, bufsize,
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(xfs_off_t *)&filp->f_pos, filldir);
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if (error)
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return -error;
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return 0;
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}
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STATIC int
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xfs_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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vma->vm_ops = &xfs_file_vm_ops;
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vma->vm_flags |= VM_CAN_NONLINEAR;
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file_accessed(filp);
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return 0;
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}
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/*
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* mmap()d file has taken write protection fault and is being made
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* writable. We can set the page state up correctly for a writable
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* page, which means we can do correct delalloc accounting (ENOSPC
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* checking!) and unwritten extent mapping.
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*/
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STATIC int
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xfs_vm_page_mkwrite(
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struct vm_area_struct *vma,
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struct page *page)
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{
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return block_page_mkwrite(vma, page, xfs_get_blocks);
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}
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const struct file_operations xfs_file_operations = {
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.llseek = generic_file_llseek,
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.read = do_sync_read,
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.write = do_sync_write,
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.aio_read = xfs_file_aio_read,
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.aio_write = xfs_file_aio_write,
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.splice_read = xfs_file_splice_read,
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.splice_write = xfs_file_splice_write,
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.unlocked_ioctl = xfs_file_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = xfs_file_compat_ioctl,
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#endif
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.mmap = xfs_file_mmap,
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.open = xfs_file_open,
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.release = xfs_file_release,
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.fsync = xfs_file_fsync,
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#ifdef HAVE_FOP_OPEN_EXEC
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.open_exec = xfs_file_open_exec,
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#endif
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};
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const struct file_operations xfs_dir_file_operations = {
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.open = xfs_dir_open,
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.read = generic_read_dir,
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.readdir = xfs_file_readdir,
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.llseek = generic_file_llseek,
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.unlocked_ioctl = xfs_file_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = xfs_file_compat_ioctl,
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#endif
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.fsync = xfs_file_fsync,
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};
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static struct vm_operations_struct xfs_file_vm_ops = {
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.fault = filemap_fault,
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.page_mkwrite = xfs_vm_page_mkwrite,
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};
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