1083 lines
27 KiB
C
1083 lines
27 KiB
C
/*
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* Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write the Free Software Foundation, Inc., 59
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* Temple Place - Suite 330, Boston MA 02111-1307, USA.
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*
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* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
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* Mountain View, CA 94043, or:
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*
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* http://www.sgi.com
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*
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* For further information regarding this notice, see:
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*
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* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
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*/
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/*
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* fs/xfs/linux/xfs_lrw.c (Linux Read Write stuff)
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*
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_inum.h"
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#include "xfs_log.h"
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#include "xfs_trans.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_alloc.h"
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#include "xfs_dmapi.h"
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#include "xfs_quota.h"
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#include "xfs_mount.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_btree.h"
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#include "xfs_ialloc.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_bmap.h"
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#include "xfs_bit.h"
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#include "xfs_rtalloc.h"
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#include "xfs_error.h"
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#include "xfs_itable.h"
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#include "xfs_rw.h"
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#include "xfs_acl.h"
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#include "xfs_cap.h"
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#include "xfs_mac.h"
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#include "xfs_attr.h"
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#include "xfs_inode_item.h"
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#include "xfs_buf_item.h"
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#include "xfs_utils.h"
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#include "xfs_iomap.h"
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#include <linux/capability.h>
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#include <linux/writeback.h>
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#if defined(XFS_RW_TRACE)
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void
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xfs_rw_enter_trace(
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int tag,
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xfs_iocore_t *io,
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void *data,
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size_t segs,
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loff_t offset,
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int ioflags)
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{
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xfs_inode_t *ip = XFS_IO_INODE(io);
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if (ip->i_rwtrace == NULL)
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return;
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ktrace_enter(ip->i_rwtrace,
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(void *)(unsigned long)tag,
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(void *)ip,
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(void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
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(void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
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(void *)data,
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(void *)((unsigned long)segs),
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(void *)((unsigned long)((offset >> 32) & 0xffffffff)),
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(void *)((unsigned long)(offset & 0xffffffff)),
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(void *)((unsigned long)ioflags),
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(void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),
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(void *)((unsigned long)(io->io_new_size & 0xffffffff)),
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL);
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}
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void
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xfs_inval_cached_trace(
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xfs_iocore_t *io,
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xfs_off_t offset,
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xfs_off_t len,
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xfs_off_t first,
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xfs_off_t last)
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{
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xfs_inode_t *ip = XFS_IO_INODE(io);
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if (ip->i_rwtrace == NULL)
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return;
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ktrace_enter(ip->i_rwtrace,
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(void *)(__psint_t)XFS_INVAL_CACHED,
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(void *)ip,
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(void *)((unsigned long)((offset >> 32) & 0xffffffff)),
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(void *)((unsigned long)(offset & 0xffffffff)),
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(void *)((unsigned long)((len >> 32) & 0xffffffff)),
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(void *)((unsigned long)(len & 0xffffffff)),
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(void *)((unsigned long)((first >> 32) & 0xffffffff)),
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(void *)((unsigned long)(first & 0xffffffff)),
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(void *)((unsigned long)((last >> 32) & 0xffffffff)),
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(void *)((unsigned long)(last & 0xffffffff)),
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL);
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}
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#endif
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/*
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* xfs_iozero
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*
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* xfs_iozero clears the specified range of buffer supplied,
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* and marks all the affected blocks as valid and modified. If
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* an affected block is not allocated, it will be allocated. If
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* an affected block is not completely overwritten, and is not
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* valid before the operation, it will be read from disk before
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* being partially zeroed.
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*/
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STATIC int
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xfs_iozero(
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struct inode *ip, /* inode */
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loff_t pos, /* offset in file */
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size_t count, /* size of data to zero */
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loff_t end_size) /* max file size to set */
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{
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unsigned bytes;
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struct page *page;
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struct address_space *mapping;
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char *kaddr;
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int status;
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mapping = ip->i_mapping;
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do {
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unsigned long index, offset;
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offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
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index = pos >> PAGE_CACHE_SHIFT;
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bytes = PAGE_CACHE_SIZE - offset;
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if (bytes > count)
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bytes = count;
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status = -ENOMEM;
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page = grab_cache_page(mapping, index);
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if (!page)
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break;
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kaddr = kmap(page);
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status = mapping->a_ops->prepare_write(NULL, page, offset,
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offset + bytes);
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if (status) {
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goto unlock;
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}
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memset((void *) (kaddr + offset), 0, bytes);
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flush_dcache_page(page);
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status = mapping->a_ops->commit_write(NULL, page, offset,
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offset + bytes);
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if (!status) {
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pos += bytes;
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count -= bytes;
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if (pos > i_size_read(ip))
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i_size_write(ip, pos < end_size ? pos : end_size);
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}
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unlock:
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kunmap(page);
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unlock_page(page);
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page_cache_release(page);
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if (status)
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break;
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} while (count);
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return (-status);
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}
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/*
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* xfs_inval_cached_pages
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*
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* This routine is responsible for keeping direct I/O and buffered I/O
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* somewhat coherent. From here we make sure that we're at least
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* temporarily holding the inode I/O lock exclusively and then call
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* the page cache to flush and invalidate any cached pages. If there
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* are no cached pages this routine will be very quick.
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*/
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void
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xfs_inval_cached_pages(
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vnode_t *vp,
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xfs_iocore_t *io,
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xfs_off_t offset,
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int write,
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int relock)
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{
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if (VN_CACHED(vp)) {
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xfs_inval_cached_trace(io, offset, -1, ctooff(offtoct(offset)), -1);
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VOP_FLUSHINVAL_PAGES(vp, ctooff(offtoct(offset)), -1, FI_REMAPF_LOCKED);
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}
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}
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ssize_t /* bytes read, or (-) error */
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xfs_read(
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bhv_desc_t *bdp,
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struct kiocb *iocb,
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const struct iovec *iovp,
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unsigned int segs,
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loff_t *offset,
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int ioflags,
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cred_t *credp)
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{
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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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size_t size = 0;
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ssize_t ret;
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xfs_fsize_t n;
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xfs_inode_t *ip;
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xfs_mount_t *mp;
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vnode_t *vp;
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unsigned long seg;
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ip = XFS_BHVTOI(bdp);
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vp = BHV_TO_VNODE(bdp);
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mp = ip->i_mount;
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XFS_STATS_INC(xs_read_calls);
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/* START copy & waste from filemap.c */
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for (seg = 0; seg < segs; seg++) {
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const struct iovec *iv = &iovp[seg];
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/*
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* If any segment has a negative length, or the cumulative
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* length ever wraps negative then return -EINVAL.
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*/
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size += iv->iov_len;
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if (unlikely((ssize_t)(size|iv->iov_len) < 0))
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return XFS_ERROR(-EINVAL);
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}
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/* END copy & waste from filemap.c */
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if (unlikely(ioflags & IO_ISDIRECT)) {
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xfs_buftarg_t *target =
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(ip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
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mp->m_rtdev_targp : mp->m_ddev_targp;
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if ((*offset & target->pbr_smask) ||
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(size & target->pbr_smask)) {
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if (*offset == ip->i_d.di_size) {
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return (0);
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}
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return -XFS_ERROR(EINVAL);
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}
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}
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n = XFS_MAXIOFFSET(mp) - *offset;
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if ((n <= 0) || (size == 0))
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return 0;
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if (n < size)
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size = n;
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if (XFS_FORCED_SHUTDOWN(mp)) {
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return -EIO;
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}
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if (unlikely(ioflags & IO_ISDIRECT))
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down(&inode->i_sem);
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xfs_ilock(ip, XFS_IOLOCK_SHARED);
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if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ) &&
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!(ioflags & IO_INVIS)) {
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vrwlock_t locktype = VRWLOCK_READ;
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ret = -XFS_SEND_DATA(mp, DM_EVENT_READ,
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BHV_TO_VNODE(bdp), *offset, size,
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FILP_DELAY_FLAG(file), &locktype);
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if (ret) {
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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goto unlock_isem;
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}
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}
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xfs_rw_enter_trace(XFS_READ_ENTER, &ip->i_iocore,
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(void *)iovp, segs, *offset, ioflags);
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ret = __generic_file_aio_read(iocb, iovp, segs, offset);
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if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
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ret = wait_on_sync_kiocb(iocb);
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if (ret > 0)
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XFS_STATS_ADD(xs_read_bytes, ret);
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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if (likely(!(ioflags & IO_INVIS)))
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xfs_ichgtime(ip, XFS_ICHGTIME_ACC);
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unlock_isem:
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if (unlikely(ioflags & IO_ISDIRECT))
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up(&inode->i_sem);
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return ret;
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}
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ssize_t
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xfs_sendfile(
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bhv_desc_t *bdp,
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struct file *filp,
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loff_t *offset,
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int ioflags,
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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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cred_t *credp)
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{
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ssize_t ret;
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xfs_fsize_t n;
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xfs_inode_t *ip;
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xfs_mount_t *mp;
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vnode_t *vp;
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ip = XFS_BHVTOI(bdp);
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vp = BHV_TO_VNODE(bdp);
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mp = ip->i_mount;
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XFS_STATS_INC(xs_read_calls);
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n = XFS_MAXIOFFSET(mp) - *offset;
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if ((n <= 0) || (count == 0))
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return 0;
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if (n < count)
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count = n;
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if (XFS_FORCED_SHUTDOWN(ip->i_mount))
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return -EIO;
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xfs_ilock(ip, XFS_IOLOCK_SHARED);
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if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ) &&
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(!(ioflags & IO_INVIS))) {
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vrwlock_t locktype = VRWLOCK_READ;
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int error;
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error = XFS_SEND_DATA(mp, DM_EVENT_READ, BHV_TO_VNODE(bdp), *offset, count,
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FILP_DELAY_FLAG(filp), &locktype);
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if (error) {
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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return -error;
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}
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}
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xfs_rw_enter_trace(XFS_SENDFILE_ENTER, &ip->i_iocore,
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(void *)(unsigned long)target, count, *offset, ioflags);
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ret = generic_file_sendfile(filp, offset, count, actor, target);
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xfs_iunlock(ip, XFS_IOLOCK_SHARED);
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if (ret > 0)
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XFS_STATS_ADD(xs_read_bytes, ret);
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if (likely(!(ioflags & IO_INVIS)))
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xfs_ichgtime(ip, XFS_ICHGTIME_ACC);
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return ret;
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}
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/*
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* This routine is called to handle zeroing any space in the last
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* block of the file that is beyond the EOF. We do this since the
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* size is being increased without writing anything to that block
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* and we don't want anyone to read the garbage on the disk.
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*/
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STATIC int /* error (positive) */
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xfs_zero_last_block(
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struct inode *ip,
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xfs_iocore_t *io,
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xfs_off_t offset,
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xfs_fsize_t isize,
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xfs_fsize_t end_size)
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{
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xfs_fileoff_t last_fsb;
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xfs_mount_t *mp;
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int nimaps;
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int zero_offset;
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int zero_len;
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int isize_fsb_offset;
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int error = 0;
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xfs_bmbt_irec_t imap;
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loff_t loff;
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size_t lsize;
|
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|
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ASSERT(ismrlocked(io->io_lock, MR_UPDATE) != 0);
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ASSERT(offset > isize);
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mp = io->io_mount;
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isize_fsb_offset = XFS_B_FSB_OFFSET(mp, isize);
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if (isize_fsb_offset == 0) {
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/*
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* There are no extra bytes in the last block on disk to
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* zero, so return.
|
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*/
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return 0;
|
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}
|
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|
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last_fsb = XFS_B_TO_FSBT(mp, isize);
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nimaps = 1;
|
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error = XFS_BMAPI(mp, NULL, io, last_fsb, 1, 0, NULL, 0, &imap,
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&nimaps, NULL);
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if (error) {
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return error;
|
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}
|
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ASSERT(nimaps > 0);
|
|
/*
|
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* If the block underlying isize is just a hole, then there
|
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* is nothing to zero.
|
|
*/
|
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if (imap.br_startblock == HOLESTARTBLOCK) {
|
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return 0;
|
|
}
|
|
/*
|
|
* Zero the part of the last block beyond the EOF, and write it
|
|
* out sync. We need to drop the ilock while we do this so we
|
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* don't deadlock when the buffer cache calls back to us.
|
|
*/
|
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XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL| XFS_EXTSIZE_RD);
|
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loff = XFS_FSB_TO_B(mp, last_fsb);
|
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lsize = XFS_FSB_TO_B(mp, 1);
|
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|
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zero_offset = isize_fsb_offset;
|
|
zero_len = mp->m_sb.sb_blocksize - isize_fsb_offset;
|
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|
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error = xfs_iozero(ip, loff + zero_offset, zero_len, end_size);
|
|
|
|
XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
|
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ASSERT(error >= 0);
|
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return error;
|
|
}
|
|
|
|
/*
|
|
* Zero any on disk space between the current EOF and the new,
|
|
* larger EOF. This handles the normal case of zeroing the remainder
|
|
* of the last block in the file and the unusual case of zeroing blocks
|
|
* out beyond the size of the file. This second case only happens
|
|
* with fixed size extents and when the system crashes before the inode
|
|
* size was updated but after blocks were allocated. If fill is set,
|
|
* then any holes in the range are filled and zeroed. If not, the holes
|
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* are left alone as holes.
|
|
*/
|
|
|
|
int /* error (positive) */
|
|
xfs_zero_eof(
|
|
vnode_t *vp,
|
|
xfs_iocore_t *io,
|
|
xfs_off_t offset, /* starting I/O offset */
|
|
xfs_fsize_t isize, /* current inode size */
|
|
xfs_fsize_t end_size) /* terminal inode size */
|
|
{
|
|
struct inode *ip = LINVFS_GET_IP(vp);
|
|
xfs_fileoff_t start_zero_fsb;
|
|
xfs_fileoff_t end_zero_fsb;
|
|
xfs_fileoff_t prev_zero_fsb;
|
|
xfs_fileoff_t zero_count_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
xfs_extlen_t buf_len_fsb;
|
|
xfs_extlen_t prev_zero_count;
|
|
xfs_mount_t *mp;
|
|
int nimaps;
|
|
int error = 0;
|
|
xfs_bmbt_irec_t imap;
|
|
loff_t loff;
|
|
size_t lsize;
|
|
|
|
ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
|
|
ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));
|
|
|
|
mp = io->io_mount;
|
|
|
|
/*
|
|
* First handle zeroing the block on which isize resides.
|
|
* We only zero a part of that block so it is handled specially.
|
|
*/
|
|
error = xfs_zero_last_block(ip, io, offset, isize, end_size);
|
|
if (error) {
|
|
ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
|
|
ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Calculate the range between the new size and the old
|
|
* where blocks needing to be zeroed may exist. To get the
|
|
* block where the last byte in the file currently resides,
|
|
* we need to subtract one from the size and truncate back
|
|
* to a block boundary. We subtract 1 in case the size is
|
|
* exactly on a block boundary.
|
|
*/
|
|
last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
|
|
start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
|
|
end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
|
|
ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
|
|
if (last_fsb == end_zero_fsb) {
|
|
/*
|
|
* The size was only incremented on its last block.
|
|
* We took care of that above, so just return.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
ASSERT(start_zero_fsb <= end_zero_fsb);
|
|
prev_zero_fsb = NULLFILEOFF;
|
|
prev_zero_count = 0;
|
|
while (start_zero_fsb <= end_zero_fsb) {
|
|
nimaps = 1;
|
|
zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
|
|
error = XFS_BMAPI(mp, NULL, io, start_zero_fsb, zero_count_fsb,
|
|
0, NULL, 0, &imap, &nimaps, NULL);
|
|
if (error) {
|
|
ASSERT(ismrlocked(io->io_lock, MR_UPDATE));
|
|
ASSERT(ismrlocked(io->io_iolock, MR_UPDATE));
|
|
return error;
|
|
}
|
|
ASSERT(nimaps > 0);
|
|
|
|
if (imap.br_state == XFS_EXT_UNWRITTEN ||
|
|
imap.br_startblock == HOLESTARTBLOCK) {
|
|
/*
|
|
* This loop handles initializing pages that were
|
|
* partially initialized by the code below this
|
|
* loop. It basically zeroes the part of the page
|
|
* that sits on a hole and sets the page as P_HOLE
|
|
* and calls remapf if it is a mapped file.
|
|
*/
|
|
prev_zero_fsb = NULLFILEOFF;
|
|
prev_zero_count = 0;
|
|
start_zero_fsb = imap.br_startoff +
|
|
imap.br_blockcount;
|
|
ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* There are blocks in the range requested.
|
|
* Zero them a single write at a time. We actually
|
|
* don't zero the entire range returned if it is
|
|
* too big and simply loop around to get the rest.
|
|
* That is not the most efficient thing to do, but it
|
|
* is simple and this path should not be exercised often.
|
|
*/
|
|
buf_len_fsb = XFS_FILBLKS_MIN(imap.br_blockcount,
|
|
mp->m_writeio_blocks << 8);
|
|
/*
|
|
* Drop the inode lock while we're doing the I/O.
|
|
* We'll still have the iolock to protect us.
|
|
*/
|
|
XFS_IUNLOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
|
|
|
|
loff = XFS_FSB_TO_B(mp, start_zero_fsb);
|
|
lsize = XFS_FSB_TO_B(mp, buf_len_fsb);
|
|
|
|
error = xfs_iozero(ip, loff, lsize, end_size);
|
|
|
|
if (error) {
|
|
goto out_lock;
|
|
}
|
|
|
|
prev_zero_fsb = start_zero_fsb;
|
|
prev_zero_count = buf_len_fsb;
|
|
start_zero_fsb = imap.br_startoff + buf_len_fsb;
|
|
ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
|
|
|
|
XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_lock:
|
|
|
|
XFS_ILOCK(mp, io, XFS_ILOCK_EXCL|XFS_EXTSIZE_RD);
|
|
ASSERT(error >= 0);
|
|
return error;
|
|
}
|
|
|
|
ssize_t /* bytes written, or (-) error */
|
|
xfs_write(
|
|
bhv_desc_t *bdp,
|
|
struct kiocb *iocb,
|
|
const struct iovec *iovp,
|
|
unsigned int nsegs,
|
|
loff_t *offset,
|
|
int ioflags,
|
|
cred_t *credp)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct address_space *mapping = file->f_mapping;
|
|
struct inode *inode = mapping->host;
|
|
unsigned long segs = nsegs;
|
|
xfs_inode_t *xip;
|
|
xfs_mount_t *mp;
|
|
ssize_t ret = 0, error = 0;
|
|
xfs_fsize_t isize, new_size;
|
|
xfs_iocore_t *io;
|
|
vnode_t *vp;
|
|
unsigned long seg;
|
|
int iolock;
|
|
int eventsent = 0;
|
|
vrwlock_t locktype;
|
|
size_t ocount = 0, count;
|
|
loff_t pos;
|
|
int need_isem = 1, need_flush = 0;
|
|
|
|
XFS_STATS_INC(xs_write_calls);
|
|
|
|
vp = BHV_TO_VNODE(bdp);
|
|
xip = XFS_BHVTOI(bdp);
|
|
|
|
for (seg = 0; seg < segs; seg++) {
|
|
const struct iovec *iv = &iovp[seg];
|
|
|
|
/*
|
|
* If any segment has a negative length, or the cumulative
|
|
* length ever wraps negative then return -EINVAL.
|
|
*/
|
|
ocount += iv->iov_len;
|
|
if (unlikely((ssize_t)(ocount|iv->iov_len) < 0))
|
|
return -EINVAL;
|
|
if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
|
|
continue;
|
|
if (seg == 0)
|
|
return -EFAULT;
|
|
segs = seg;
|
|
ocount -= iv->iov_len; /* This segment is no good */
|
|
break;
|
|
}
|
|
|
|
count = ocount;
|
|
pos = *offset;
|
|
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
io = &xip->i_iocore;
|
|
mp = io->io_mount;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(mp))
|
|
return -EIO;
|
|
|
|
fs_check_frozen(vp->v_vfsp, SB_FREEZE_WRITE);
|
|
|
|
if (ioflags & IO_ISDIRECT) {
|
|
xfs_buftarg_t *target =
|
|
(xip->i_d.di_flags & XFS_DIFLAG_REALTIME) ?
|
|
mp->m_rtdev_targp : mp->m_ddev_targp;
|
|
|
|
if ((pos & target->pbr_smask) || (count & target->pbr_smask))
|
|
return XFS_ERROR(-EINVAL);
|
|
|
|
if (!VN_CACHED(vp) && pos < i_size_read(inode))
|
|
need_isem = 0;
|
|
|
|
if (VN_CACHED(vp))
|
|
need_flush = 1;
|
|
}
|
|
|
|
relock:
|
|
if (need_isem) {
|
|
iolock = XFS_IOLOCK_EXCL;
|
|
locktype = VRWLOCK_WRITE;
|
|
|
|
down(&inode->i_sem);
|
|
} else {
|
|
iolock = XFS_IOLOCK_SHARED;
|
|
locktype = VRWLOCK_WRITE_DIRECT;
|
|
}
|
|
|
|
xfs_ilock(xip, XFS_ILOCK_EXCL|iolock);
|
|
|
|
isize = i_size_read(inode);
|
|
|
|
if (file->f_flags & O_APPEND)
|
|
*offset = isize;
|
|
|
|
start:
|
|
error = -generic_write_checks(file, &pos, &count,
|
|
S_ISBLK(inode->i_mode));
|
|
if (error) {
|
|
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
|
goto out_unlock_isem;
|
|
}
|
|
|
|
new_size = pos + count;
|
|
if (new_size > isize)
|
|
io->io_new_size = new_size;
|
|
|
|
if ((DM_EVENT_ENABLED(vp->v_vfsp, xip, DM_EVENT_WRITE) &&
|
|
!(ioflags & IO_INVIS) && !eventsent)) {
|
|
loff_t savedsize = pos;
|
|
int dmflags = FILP_DELAY_FLAG(file);
|
|
|
|
if (need_isem)
|
|
dmflags |= DM_FLAGS_ISEM;
|
|
|
|
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
|
error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, vp,
|
|
pos, count,
|
|
dmflags, &locktype);
|
|
if (error) {
|
|
xfs_iunlock(xip, iolock);
|
|
goto out_unlock_isem;
|
|
}
|
|
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
|
eventsent = 1;
|
|
|
|
/*
|
|
* The iolock was dropped and reaquired in XFS_SEND_DATA
|
|
* so we have to recheck the size when appending.
|
|
* We will only "goto start;" once, since having sent the
|
|
* event prevents another call to XFS_SEND_DATA, which is
|
|
* what allows the size to change in the first place.
|
|
*/
|
|
if ((file->f_flags & O_APPEND) && savedsize != isize) {
|
|
pos = isize = xip->i_d.di_size;
|
|
goto start;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* On Linux, generic_file_write updates the times even if
|
|
* no data is copied in so long as the write had a size.
|
|
*
|
|
* We must update xfs' times since revalidate will overcopy xfs.
|
|
*/
|
|
if (!(ioflags & IO_INVIS)) {
|
|
xfs_ichgtime(xip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
inode_update_time(inode, 1);
|
|
}
|
|
|
|
/*
|
|
* If the offset is beyond the size of the file, we have a couple
|
|
* of things to do. First, if there is already space allocated
|
|
* we need to either create holes or zero the disk or ...
|
|
*
|
|
* If there is a page where the previous size lands, we need
|
|
* to zero it out up to the new size.
|
|
*/
|
|
|
|
if (pos > isize) {
|
|
error = xfs_zero_eof(BHV_TO_VNODE(bdp), io, pos,
|
|
isize, pos + count);
|
|
if (error) {
|
|
xfs_iunlock(xip, XFS_ILOCK_EXCL|iolock);
|
|
goto out_unlock_isem;
|
|
}
|
|
}
|
|
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
|
|
|
/*
|
|
* If we're writing the file then make sure to clear the
|
|
* setuid and setgid bits if the process is not being run
|
|
* by root. This keeps people from modifying setuid and
|
|
* setgid binaries.
|
|
*/
|
|
|
|
if (((xip->i_d.di_mode & S_ISUID) ||
|
|
((xip->i_d.di_mode & (S_ISGID | S_IXGRP)) ==
|
|
(S_ISGID | S_IXGRP))) &&
|
|
!capable(CAP_FSETID)) {
|
|
error = xfs_write_clear_setuid(xip);
|
|
if (likely(!error))
|
|
error = -remove_suid(file->f_dentry);
|
|
if (unlikely(error)) {
|
|
xfs_iunlock(xip, iolock);
|
|
goto out_unlock_isem;
|
|
}
|
|
}
|
|
|
|
retry:
|
|
/* We can write back this queue in page reclaim */
|
|
current->backing_dev_info = mapping->backing_dev_info;
|
|
|
|
if ((ioflags & IO_ISDIRECT)) {
|
|
if (need_flush) {
|
|
xfs_inval_cached_trace(io, pos, -1,
|
|
ctooff(offtoct(pos)), -1);
|
|
VOP_FLUSHINVAL_PAGES(vp, ctooff(offtoct(pos)),
|
|
-1, FI_REMAPF_LOCKED);
|
|
}
|
|
|
|
if (need_isem) {
|
|
/* demote the lock now the cached pages are gone */
|
|
XFS_ILOCK_DEMOTE(mp, io, XFS_IOLOCK_EXCL);
|
|
up(&inode->i_sem);
|
|
|
|
iolock = XFS_IOLOCK_SHARED;
|
|
locktype = VRWLOCK_WRITE_DIRECT;
|
|
need_isem = 0;
|
|
}
|
|
|
|
xfs_rw_enter_trace(XFS_DIOWR_ENTER, io, (void *)iovp, segs,
|
|
*offset, ioflags);
|
|
ret = generic_file_direct_write(iocb, iovp,
|
|
&segs, pos, offset, count, ocount);
|
|
|
|
/*
|
|
* direct-io write to a hole: fall through to buffered I/O
|
|
* for completing the rest of the request.
|
|
*/
|
|
if (ret >= 0 && ret != count) {
|
|
XFS_STATS_ADD(xs_write_bytes, ret);
|
|
|
|
pos += ret;
|
|
count -= ret;
|
|
|
|
need_isem = 1;
|
|
ioflags &= ~IO_ISDIRECT;
|
|
xfs_iunlock(xip, iolock);
|
|
goto relock;
|
|
}
|
|
} else {
|
|
xfs_rw_enter_trace(XFS_WRITE_ENTER, io, (void *)iovp, segs,
|
|
*offset, ioflags);
|
|
ret = generic_file_buffered_write(iocb, iovp, segs,
|
|
pos, offset, count, ret);
|
|
}
|
|
|
|
current->backing_dev_info = NULL;
|
|
|
|
if (ret == -EIOCBQUEUED && !(ioflags & IO_ISAIO))
|
|
ret = wait_on_sync_kiocb(iocb);
|
|
|
|
if ((ret == -ENOSPC) &&
|
|
DM_EVENT_ENABLED(vp->v_vfsp, xip, DM_EVENT_NOSPACE) &&
|
|
!(ioflags & IO_INVIS)) {
|
|
|
|
xfs_rwunlock(bdp, locktype);
|
|
error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, vp,
|
|
DM_RIGHT_NULL, vp, DM_RIGHT_NULL, NULL, NULL,
|
|
0, 0, 0); /* Delay flag intentionally unused */
|
|
if (error)
|
|
goto out_unlock_isem;
|
|
xfs_rwlock(bdp, locktype);
|
|
pos = xip->i_d.di_size;
|
|
ret = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (*offset > xip->i_d.di_size) {
|
|
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
|
if (*offset > xip->i_d.di_size) {
|
|
xip->i_d.di_size = *offset;
|
|
i_size_write(inode, *offset);
|
|
xip->i_update_core = 1;
|
|
xip->i_update_size = 1;
|
|
}
|
|
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
error = -ret;
|
|
if (ret <= 0)
|
|
goto out_unlock_internal;
|
|
|
|
XFS_STATS_ADD(xs_write_bytes, ret);
|
|
|
|
/* Handle various SYNC-type writes */
|
|
if ((file->f_flags & O_SYNC) || IS_SYNC(inode)) {
|
|
/*
|
|
* If we're treating this as O_DSYNC and we have not updated the
|
|
* size, force the log.
|
|
*/
|
|
if (!(mp->m_flags & XFS_MOUNT_OSYNCISOSYNC) &&
|
|
!(xip->i_update_size)) {
|
|
xfs_inode_log_item_t *iip = xip->i_itemp;
|
|
|
|
/*
|
|
* If an allocation transaction occurred
|
|
* without extending the size, then we have to force
|
|
* the log up the proper point to ensure that the
|
|
* allocation is permanent. We can't count on
|
|
* the fact that buffered writes lock out direct I/O
|
|
* writes - the direct I/O write could have extended
|
|
* the size nontransactionally, then finished before
|
|
* we started. xfs_write_file will think that the file
|
|
* didn't grow but the update isn't safe unless the
|
|
* size change is logged.
|
|
*
|
|
* Force the log if we've committed a transaction
|
|
* against the inode or if someone else has and
|
|
* the commit record hasn't gone to disk (e.g.
|
|
* the inode is pinned). This guarantees that
|
|
* all changes affecting the inode are permanent
|
|
* when we return.
|
|
*/
|
|
if (iip && iip->ili_last_lsn) {
|
|
xfs_log_force(mp, iip->ili_last_lsn,
|
|
XFS_LOG_FORCE | XFS_LOG_SYNC);
|
|
} else if (xfs_ipincount(xip) > 0) {
|
|
xfs_log_force(mp, (xfs_lsn_t)0,
|
|
XFS_LOG_FORCE | XFS_LOG_SYNC);
|
|
}
|
|
|
|
} else {
|
|
xfs_trans_t *tp;
|
|
|
|
/*
|
|
* O_SYNC or O_DSYNC _with_ a size update are handled
|
|
* the same way.
|
|
*
|
|
* If the write was synchronous then we need to make
|
|
* sure that the inode modification time is permanent.
|
|
* We'll have updated the timestamp above, so here
|
|
* we use a synchronous transaction to log the inode.
|
|
* It's not fast, but it's necessary.
|
|
*
|
|
* If this a dsync write and the size got changed
|
|
* non-transactionally, then we need to ensure that
|
|
* the size change gets logged in a synchronous
|
|
* transaction.
|
|
*/
|
|
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_WRITE_SYNC);
|
|
if ((error = xfs_trans_reserve(tp, 0,
|
|
XFS_SWRITE_LOG_RES(mp),
|
|
0, 0, 0))) {
|
|
/* Transaction reserve failed */
|
|
xfs_trans_cancel(tp, 0);
|
|
} else {
|
|
/* Transaction reserve successful */
|
|
xfs_ilock(xip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, xip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ihold(tp, xip);
|
|
xfs_trans_log_inode(tp, xip, XFS_ILOG_CORE);
|
|
xfs_trans_set_sync(tp);
|
|
error = xfs_trans_commit(tp, 0, NULL);
|
|
xfs_iunlock(xip, XFS_ILOCK_EXCL);
|
|
}
|
|
if (error)
|
|
goto out_unlock_internal;
|
|
}
|
|
|
|
xfs_rwunlock(bdp, locktype);
|
|
if (need_isem)
|
|
up(&inode->i_sem);
|
|
|
|
error = sync_page_range(inode, mapping, pos, ret);
|
|
if (!error)
|
|
error = ret;
|
|
return error;
|
|
}
|
|
|
|
out_unlock_internal:
|
|
xfs_rwunlock(bdp, locktype);
|
|
out_unlock_isem:
|
|
if (need_isem)
|
|
up(&inode->i_sem);
|
|
return -error;
|
|
}
|
|
|
|
/*
|
|
* All xfs metadata buffers except log state machine buffers
|
|
* get this attached as their b_bdstrat callback function.
|
|
* This is so that we can catch a buffer
|
|
* after prematurely unpinning it to forcibly shutdown the filesystem.
|
|
*/
|
|
int
|
|
xfs_bdstrat_cb(struct xfs_buf *bp)
|
|
{
|
|
xfs_mount_t *mp;
|
|
|
|
mp = XFS_BUF_FSPRIVATE3(bp, xfs_mount_t *);
|
|
if (!XFS_FORCED_SHUTDOWN(mp)) {
|
|
pagebuf_iorequest(bp);
|
|
return 0;
|
|
} else {
|
|
xfs_buftrace("XFS__BDSTRAT IOERROR", bp);
|
|
/*
|
|
* Metadata write that didn't get logged but
|
|
* written delayed anyway. These aren't associated
|
|
* with a transaction, and can be ignored.
|
|
*/
|
|
if (XFS_BUF_IODONE_FUNC(bp) == NULL &&
|
|
(XFS_BUF_ISREAD(bp)) == 0)
|
|
return (xfs_bioerror_relse(bp));
|
|
else
|
|
return (xfs_bioerror(bp));
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
xfs_bmap(bhv_desc_t *bdp,
|
|
xfs_off_t offset,
|
|
ssize_t count,
|
|
int flags,
|
|
xfs_iomap_t *iomapp,
|
|
int *niomaps)
|
|
{
|
|
xfs_inode_t *ip = XFS_BHVTOI(bdp);
|
|
xfs_iocore_t *io = &ip->i_iocore;
|
|
|
|
ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG);
|
|
ASSERT(((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) != 0) ==
|
|
((ip->i_iocore.io_flags & XFS_IOCORE_RT) != 0));
|
|
|
|
return xfs_iomap(io, offset, count, flags, iomapp, niomaps);
|
|
}
|
|
|
|
/*
|
|
* Wrapper around bdstrat so that we can stop data
|
|
* from going to disk in case we are shutting down the filesystem.
|
|
* Typically user data goes thru this path; one of the exceptions
|
|
* is the superblock.
|
|
*/
|
|
int
|
|
xfsbdstrat(
|
|
struct xfs_mount *mp,
|
|
struct xfs_buf *bp)
|
|
{
|
|
ASSERT(mp);
|
|
if (!XFS_FORCED_SHUTDOWN(mp)) {
|
|
/* Grio redirection would go here
|
|
* if (XFS_BUF_IS_GRIO(bp)) {
|
|
*/
|
|
|
|
pagebuf_iorequest(bp);
|
|
return 0;
|
|
}
|
|
|
|
xfs_buftrace("XFSBDSTRAT IOERROR", bp);
|
|
return (xfs_bioerror_relse(bp));
|
|
}
|
|
|
|
/*
|
|
* If the underlying (data/log/rt) device is readonly, there are some
|
|
* operations that cannot proceed.
|
|
*/
|
|
int
|
|
xfs_dev_is_read_only(
|
|
xfs_mount_t *mp,
|
|
char *message)
|
|
{
|
|
if (xfs_readonly_buftarg(mp->m_ddev_targp) ||
|
|
xfs_readonly_buftarg(mp->m_logdev_targp) ||
|
|
(mp->m_rtdev_targp && xfs_readonly_buftarg(mp->m_rtdev_targp))) {
|
|
cmn_err(CE_NOTE,
|
|
"XFS: %s required on read-only device.", message);
|
|
cmn_err(CE_NOTE,
|
|
"XFS: write access unavailable, cannot proceed.");
|
|
return EROFS;
|
|
}
|
|
return 0;
|
|
}
|