12017faf38
A lot of code has been converted away from semaphores, but there are still comments that reference semaphore behaviour. The log code is the worst offender. Update the comments to reflect what the code really does now. SGI-PV: 981498 SGI-Modid: xfs-linux-melb:xfs-kern:31814a Signed-off-by: David Chinner <david@fromorbit.com> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
/*
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* Copyright (c) 2000-2003,2005 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_vnodeops.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_inode.h"
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/*
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* And this gunk is needed for xfs_mount.h"
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*/
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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_dmapi.h"
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#include "xfs_inum.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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/*
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* Dedicated vnode inactive/reclaim sync wait queues.
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* Prime number of hash buckets since address is used as the key.
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*/
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#define NVSYNC 37
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#define vptosync(v) (&vsync[((unsigned long)v) % NVSYNC])
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static wait_queue_head_t vsync[NVSYNC];
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void __init
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vn_init(void)
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{
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int i;
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for (i = 0; i < NVSYNC; i++)
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init_waitqueue_head(&vsync[i]);
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}
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void
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vn_iowait(
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xfs_inode_t *ip)
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{
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wait_queue_head_t *wq = vptosync(ip);
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wait_event(*wq, (atomic_read(&ip->i_iocount) == 0));
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}
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void
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vn_iowake(
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xfs_inode_t *ip)
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{
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if (atomic_dec_and_test(&ip->i_iocount))
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wake_up(vptosync(ip));
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}
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/*
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* Volume managers supporting multiple paths can send back ENODEV when the
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* final path disappears. In this case continuing to fill the page cache
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* with dirty data which cannot be written out is evil, so prevent that.
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*/
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void
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vn_ioerror(
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xfs_inode_t *ip,
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int error,
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char *f,
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int l)
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{
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if (unlikely(error == -ENODEV))
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xfs_do_force_shutdown(ip->i_mount, SHUTDOWN_DEVICE_REQ, f, l);
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}
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#ifdef XFS_INODE_TRACE
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/*
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* Reference count of Linux inode if present, -1 if the xfs_inode
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* has no associated Linux inode.
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*/
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static inline int xfs_icount(struct xfs_inode *ip)
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{
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struct inode *vp = VFS_I(ip);
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if (vp)
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return vn_count(vp);
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return -1;
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}
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#define KTRACE_ENTER(ip, vk, s, line, ra) \
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ktrace_enter( (ip)->i_trace, \
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/* 0 */ (void *)(__psint_t)(vk), \
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/* 1 */ (void *)(s), \
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/* 2 */ (void *)(__psint_t) line, \
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/* 3 */ (void *)(__psint_t)xfs_icount(ip), \
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/* 4 */ (void *)(ra), \
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/* 5 */ NULL, \
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/* 6 */ (void *)(__psint_t)current_cpu(), \
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/* 7 */ (void *)(__psint_t)current_pid(), \
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/* 8 */ (void *)__return_address, \
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/* 9 */ NULL, NULL, NULL, NULL, NULL, NULL, NULL)
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/*
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* Vnode tracing code.
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*/
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void
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_xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra)
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{
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KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra);
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}
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void
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_xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra)
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{
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KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra);
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}
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void
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xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra)
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{
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KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra);
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}
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void
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_xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra)
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{
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KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra);
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}
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void
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xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra)
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{
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KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra);
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}
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#endif /* XFS_INODE_TRACE */
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