4188c78d95
To get the read-only bind mounts in -mm to work correctly with XFS we need to call the drop_nlink and inc_nlink helpers to monitor the link count. Add calls to these to xfs_bumplink and xfs_droplink and stop copying over di_nlink to i_nlink in xfs_validate_fields and vn_revalidate. SGI-PV: 971186 SGI-Modid: xfs-linux-melb:xfs-kern:30392a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
214 lines
4.8 KiB
C
214 lines
4.8 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 semaphores.
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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
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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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/*
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* Revalidate the Linux inode from the XFS inode.
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* Note: i_size _not_ updated; we must hold the inode
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* semaphore when doing that - callers responsibility.
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*/
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int
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vn_revalidate(
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bhv_vnode_t *vp)
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{
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struct inode *inode = vn_to_inode(vp);
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struct xfs_inode *ip = XFS_I(inode);
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struct xfs_mount *mp = ip->i_mount;
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unsigned long xflags;
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xfs_itrace_entry(ip);
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if (XFS_FORCED_SHUTDOWN(mp))
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return -EIO;
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xfs_ilock(ip, XFS_ILOCK_SHARED);
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inode->i_mode = ip->i_d.di_mode;
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inode->i_uid = ip->i_d.di_uid;
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inode->i_gid = ip->i_d.di_gid;
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inode->i_mtime.tv_sec = ip->i_d.di_mtime.t_sec;
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inode->i_mtime.tv_nsec = ip->i_d.di_mtime.t_nsec;
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inode->i_ctime.tv_sec = ip->i_d.di_ctime.t_sec;
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inode->i_ctime.tv_nsec = ip->i_d.di_ctime.t_nsec;
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xflags = xfs_ip2xflags(ip);
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if (xflags & XFS_XFLAG_IMMUTABLE)
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inode->i_flags |= S_IMMUTABLE;
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else
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inode->i_flags &= ~S_IMMUTABLE;
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if (xflags & XFS_XFLAG_APPEND)
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inode->i_flags |= S_APPEND;
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else
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inode->i_flags &= ~S_APPEND;
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if (xflags & XFS_XFLAG_SYNC)
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inode->i_flags |= S_SYNC;
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else
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inode->i_flags &= ~S_SYNC;
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if (xflags & XFS_XFLAG_NOATIME)
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inode->i_flags |= S_NOATIME;
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else
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inode->i_flags &= ~S_NOATIME;
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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xfs_iflags_clear(ip, XFS_IMODIFIED);
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return 0;
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}
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/*
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* Add a reference to a referenced vnode.
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*/
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bhv_vnode_t *
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vn_hold(
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bhv_vnode_t *vp)
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{
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struct inode *inode;
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XFS_STATS_INC(vn_hold);
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inode = igrab(vn_to_inode(vp));
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ASSERT(inode);
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return vp;
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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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bhv_vnode_t *vp = XFS_ITOV_NULL(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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