2007-07-11 03:09:12 +02:00
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/*
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* Copyright (c) 2006-2007 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_bmap_btree.h"
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#include "xfs_inum.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_ag.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_mount.h"
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#include "xfs_bmap.h"
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#include "xfs_alloc.h"
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#include "xfs_utils.h"
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#include "xfs_mru_cache.h"
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#include "xfs_filestream.h"
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2009-12-15 00:14:59 +01:00
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#include "xfs_trace.h"
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2007-07-11 03:09:12 +02:00
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#ifdef XFS_FILESTREAMS_TRACE
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ktrace_t *xfs_filestreams_trace_buf;
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STATIC void
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xfs_filestreams_trace(
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xfs_mount_t *mp, /* mount point */
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int type, /* type of trace */
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const char *func, /* source function */
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int line, /* source line number */
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__psunsigned_t arg0,
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__psunsigned_t arg1,
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__psunsigned_t arg2,
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__psunsigned_t arg3,
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__psunsigned_t arg4,
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__psunsigned_t arg5)
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{
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ktrace_enter(xfs_filestreams_trace_buf,
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(void *)(__psint_t)(type | (line << 16)),
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(void *)func,
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(void *)(__psunsigned_t)current_pid(),
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(void *)mp,
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(void *)(__psunsigned_t)arg0,
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(void *)(__psunsigned_t)arg1,
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(void *)(__psunsigned_t)arg2,
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(void *)(__psunsigned_t)arg3,
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(void *)(__psunsigned_t)arg4,
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(void *)(__psunsigned_t)arg5,
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NULL, NULL, NULL, NULL, NULL, NULL);
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}
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#define TRACE0(mp,t) TRACE6(mp,t,0,0,0,0,0,0)
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#define TRACE1(mp,t,a0) TRACE6(mp,t,a0,0,0,0,0,0)
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#define TRACE2(mp,t,a0,a1) TRACE6(mp,t,a0,a1,0,0,0,0)
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#define TRACE3(mp,t,a0,a1,a2) TRACE6(mp,t,a0,a1,a2,0,0,0)
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#define TRACE4(mp,t,a0,a1,a2,a3) TRACE6(mp,t,a0,a1,a2,a3,0,0)
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#define TRACE5(mp,t,a0,a1,a2,a3,a4) TRACE6(mp,t,a0,a1,a2,a3,a4,0)
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#define TRACE6(mp,t,a0,a1,a2,a3,a4,a5) \
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2008-04-10 04:19:21 +02:00
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xfs_filestreams_trace(mp, t, __func__, __LINE__, \
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2007-07-11 03:09:12 +02:00
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(__psunsigned_t)a0, (__psunsigned_t)a1, \
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(__psunsigned_t)a2, (__psunsigned_t)a3, \
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(__psunsigned_t)a4, (__psunsigned_t)a5)
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#define TRACE_AG_SCAN(mp, ag, ag2) \
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TRACE2(mp, XFS_FSTRM_KTRACE_AGSCAN, ag, ag2);
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#define TRACE_AG_PICK1(mp, max_ag, maxfree) \
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TRACE2(mp, XFS_FSTRM_KTRACE_AGPICK1, max_ag, maxfree);
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#define TRACE_AG_PICK2(mp, ag, ag2, cnt, free, scan, flag) \
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TRACE6(mp, XFS_FSTRM_KTRACE_AGPICK2, ag, ag2, \
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cnt, free, scan, flag)
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#define TRACE_UPDATE(mp, ip, ag, cnt, ag2, cnt2) \
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TRACE5(mp, XFS_FSTRM_KTRACE_UPDATE, ip, ag, cnt, ag2, cnt2)
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#define TRACE_FREE(mp, ip, pip, ag, cnt) \
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TRACE4(mp, XFS_FSTRM_KTRACE_FREE, ip, pip, ag, cnt)
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#define TRACE_LOOKUP(mp, ip, pip, ag, cnt) \
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TRACE4(mp, XFS_FSTRM_KTRACE_ITEM_LOOKUP, ip, pip, ag, cnt)
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#define TRACE_ASSOCIATE(mp, ip, pip, ag, cnt) \
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TRACE4(mp, XFS_FSTRM_KTRACE_ASSOCIATE, ip, pip, ag, cnt)
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#define TRACE_MOVEAG(mp, ip, pip, oag, ocnt, nag, ncnt) \
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TRACE6(mp, XFS_FSTRM_KTRACE_MOVEAG, ip, pip, oag, ocnt, nag, ncnt)
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#define TRACE_ORPHAN(mp, ip, ag) \
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TRACE2(mp, XFS_FSTRM_KTRACE_ORPHAN, ip, ag);
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#else
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#define TRACE_AG_SCAN(mp, ag, ag2)
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#define TRACE_AG_PICK1(mp, max_ag, maxfree)
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#define TRACE_AG_PICK2(mp, ag, ag2, cnt, free, scan, flag)
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#define TRACE_UPDATE(mp, ip, ag, cnt, ag2, cnt2)
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#define TRACE_FREE(mp, ip, pip, ag, cnt)
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#define TRACE_LOOKUP(mp, ip, pip, ag, cnt)
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#define TRACE_ASSOCIATE(mp, ip, pip, ag, cnt)
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#define TRACE_MOVEAG(mp, ip, pip, oag, ocnt, nag, ncnt)
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#define TRACE_ORPHAN(mp, ip, ag)
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#endif
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static kmem_zone_t *item_zone;
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/*
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* Structure for associating a file or a directory with an allocation group.
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* The parent directory pointer is only needed for files, but since there will
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* generally be vastly more files than directories in the cache, using the same
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* data structure simplifies the code with very little memory overhead.
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*/
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typedef struct fstrm_item
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{
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xfs_agnumber_t ag; /* AG currently in use for the file/directory. */
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xfs_inode_t *ip; /* inode self-pointer. */
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xfs_inode_t *pip; /* Parent directory inode pointer. */
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} fstrm_item_t;
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2010-07-20 09:31:01 +02:00
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/*
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* Allocation group filestream associations are tracked with per-ag atomic
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* counters. These counters allow _xfs_filestream_pick_ag() to tell whether a
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* particular AG already has active filestreams associated with it. The mount
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* point's m_peraglock is used to protect these counters from per-ag array
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* re-allocation during a growfs operation. When xfs_growfs_data_private() is
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* about to reallocate the array, it calls xfs_filestream_flush() with the
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* m_peraglock held in write mode.
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*
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* Since xfs_mru_cache_flush() guarantees that all the free functions for all
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* the cache elements have finished executing before it returns, it's safe for
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* the free functions to use the atomic counters without m_peraglock protection.
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* This allows the implementation of xfs_fstrm_free_func() to be agnostic about
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* whether it was called with the m_peraglock held in read mode, write mode or
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* not held at all. The race condition this addresses is the following:
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*
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* - The work queue scheduler fires and pulls a filestream directory cache
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* element off the LRU end of the cache for deletion, then gets pre-empted.
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* - A growfs operation grabs the m_peraglock in write mode, flushes all the
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* remaining items from the cache and reallocates the mount point's per-ag
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* array, resetting all the counters to zero.
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* - The work queue thread resumes and calls the free function for the element
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* it started cleaning up earlier. In the process it decrements the
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* filestreams counter for an AG that now has no references.
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*
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* With a shrinkfs feature, the above scenario could panic the system.
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*
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* All other uses of the following macros should be protected by either the
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* m_peraglock held in read mode, or the cache's internal locking exposed by the
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* interval between a call to xfs_mru_cache_lookup() and a call to
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* xfs_mru_cache_done(). In addition, the m_peraglock must be held in read mode
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* when new elements are added to the cache.
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*
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* Combined, these locking rules ensure that no associations will ever exist in
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* the cache that reference per-ag array elements that have since been
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* reallocated.
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*/
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static int
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xfs_filestream_peek_ag(
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xfs_mount_t *mp,
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xfs_agnumber_t agno)
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{
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struct xfs_perag *pag;
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int ret;
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pag = xfs_perag_get(mp, agno);
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ret = atomic_read(&pag->pagf_fstrms);
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xfs_perag_put(pag);
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return ret;
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}
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static int
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xfs_filestream_get_ag(
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xfs_mount_t *mp,
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xfs_agnumber_t agno)
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{
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struct xfs_perag *pag;
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int ret;
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pag = xfs_perag_get(mp, agno);
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ret = atomic_inc_return(&pag->pagf_fstrms);
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xfs_perag_put(pag);
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return ret;
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}
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static void
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xfs_filestream_put_ag(
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xfs_mount_t *mp,
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xfs_agnumber_t agno)
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{
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struct xfs_perag *pag;
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pag = xfs_perag_get(mp, agno);
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atomic_dec(&pag->pagf_fstrms);
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xfs_perag_put(pag);
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}
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2007-07-11 03:09:12 +02:00
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/*
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* Scan the AGs starting at startag looking for an AG that isn't in use and has
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* at least minlen blocks free.
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*/
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static int
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_xfs_filestream_pick_ag(
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xfs_mount_t *mp,
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xfs_agnumber_t startag,
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xfs_agnumber_t *agp,
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int flags,
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xfs_extlen_t minlen)
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{
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2010-01-11 12:47:42 +01:00
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int streams, max_streams;
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2007-07-11 03:09:12 +02:00
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int err, trylock, nscan;
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2009-03-16 08:29:46 +01:00
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xfs_extlen_t longest, free, minfree, maxfree = 0;
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2007-07-11 03:09:12 +02:00
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xfs_agnumber_t ag, max_ag = NULLAGNUMBER;
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struct xfs_perag *pag;
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/* 2% of an AG's blocks must be free for it to be chosen. */
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minfree = mp->m_sb.sb_agblocks / 50;
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ag = startag;
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*agp = NULLAGNUMBER;
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/* For the first pass, don't sleep trying to init the per-AG. */
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trylock = XFS_ALLOC_FLAG_TRYLOCK;
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for (nscan = 0; 1; nscan++) {
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2010-01-11 12:47:42 +01:00
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pag = xfs_perag_get(mp, ag);
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TRACE_AG_SCAN(mp, ag, atomic_read(&pag->pagf_fstrms));
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2007-07-11 03:09:12 +02:00
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if (!pag->pagf_init) {
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err = xfs_alloc_pagf_init(mp, NULL, ag, trylock);
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2010-01-11 12:47:42 +01:00
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if (err && !trylock) {
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xfs_perag_put(pag);
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2007-07-11 03:09:12 +02:00
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return err;
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2010-01-11 12:47:42 +01:00
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}
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2007-07-11 03:09:12 +02:00
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}
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/* Might fail sometimes during the 1st pass with trylock set. */
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if (!pag->pagf_init)
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goto next_ag;
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/* Keep track of the AG with the most free blocks. */
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if (pag->pagf_freeblks > maxfree) {
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maxfree = pag->pagf_freeblks;
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2010-01-11 12:47:42 +01:00
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max_streams = atomic_read(&pag->pagf_fstrms);
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2007-07-11 03:09:12 +02:00
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max_ag = ag;
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}
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/*
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* The AG reference count does two things: it enforces mutual
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* exclusion when examining the suitability of an AG in this
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* loop, and it guards against two filestreams being established
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* in the same AG as each other.
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*/
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if (xfs_filestream_get_ag(mp, ag) > 1) {
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xfs_filestream_put_ag(mp, ag);
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goto next_ag;
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}
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2009-03-16 08:29:46 +01:00
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longest = xfs_alloc_longest_free_extent(mp, pag);
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2007-07-11 03:09:12 +02:00
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if (((minlen && longest >= minlen) ||
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(!minlen && pag->pagf_freeblks >= minfree)) &&
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(!pag->pagf_metadata || !(flags & XFS_PICK_USERDATA) ||
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(flags & XFS_PICK_LOWSPACE))) {
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/* Break out, retaining the reference on the AG. */
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free = pag->pagf_freeblks;
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2010-01-11 12:47:42 +01:00
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streams = atomic_read(&pag->pagf_fstrms);
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xfs_perag_put(pag);
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2007-07-11 03:09:12 +02:00
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*agp = ag;
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break;
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}
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/* Drop the reference on this AG, it's not usable. */
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xfs_filestream_put_ag(mp, ag);
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next_ag:
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2010-01-11 12:47:42 +01:00
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xfs_perag_put(pag);
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2007-07-11 03:09:12 +02:00
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/* Move to the next AG, wrapping to AG 0 if necessary. */
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if (++ag >= mp->m_sb.sb_agcount)
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ag = 0;
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/* If a full pass of the AGs hasn't been done yet, continue. */
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if (ag != startag)
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continue;
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/* Allow sleeping in xfs_alloc_pagf_init() on the 2nd pass. */
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if (trylock != 0) {
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trylock = 0;
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continue;
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}
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/* Finally, if lowspace wasn't set, set it for the 3rd pass. */
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if (!(flags & XFS_PICK_LOWSPACE)) {
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flags |= XFS_PICK_LOWSPACE;
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continue;
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}
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/*
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* Take the AG with the most free space, regardless of whether
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* it's already in use by another filestream.
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*/
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if (max_ag != NULLAGNUMBER) {
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xfs_filestream_get_ag(mp, max_ag);
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TRACE_AG_PICK1(mp, max_ag, maxfree);
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2010-01-11 12:47:42 +01:00
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streams = max_streams;
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2007-07-11 03:09:12 +02:00
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free = maxfree;
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*agp = max_ag;
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break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* take AG 0 if none matched */
|
|
|
|
TRACE_AG_PICK1(mp, max_ag, maxfree);
|
|
|
|
*agp = 0;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-01-11 12:47:42 +01:00
|
|
|
TRACE_AG_PICK2(mp, startag, *agp, streams, free, nscan, flags);
|
2007-07-11 03:09:12 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the allocation group number for a file or a directory, updating inode
|
2010-01-11 12:47:44 +01:00
|
|
|
* references and per-AG references as appropriate.
|
2007-07-11 03:09:12 +02:00
|
|
|
*/
|
|
|
|
static int
|
|
|
|
_xfs_filestream_update_ag(
|
|
|
|
xfs_inode_t *ip,
|
|
|
|
xfs_inode_t *pip,
|
|
|
|
xfs_agnumber_t ag)
|
|
|
|
{
|
|
|
|
int err = 0;
|
|
|
|
xfs_mount_t *mp;
|
|
|
|
xfs_mru_cache_t *cache;
|
|
|
|
fstrm_item_t *item;
|
|
|
|
xfs_agnumber_t old_ag;
|
|
|
|
xfs_inode_t *old_pip;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Either ip is a regular file and pip is a directory, or ip is a
|
|
|
|
* directory and pip is NULL.
|
|
|
|
*/
|
2011-07-26 08:31:30 +02:00
|
|
|
ASSERT(ip && ((S_ISREG(ip->i_d.di_mode) && pip &&
|
2011-07-26 02:54:24 +02:00
|
|
|
S_ISDIR(pip->i_d.di_mode)) ||
|
|
|
|
(S_ISDIR(ip->i_d.di_mode) && !pip)));
|
2007-07-11 03:09:12 +02:00
|
|
|
|
|
|
|
mp = ip->i_mount;
|
|
|
|
cache = mp->m_filestream;
|
|
|
|
|
|
|
|
item = xfs_mru_cache_lookup(cache, ip->i_ino);
|
|
|
|
if (item) {
|
|
|
|
ASSERT(item->ip == ip);
|
|
|
|
old_ag = item->ag;
|
|
|
|
item->ag = ag;
|
|
|
|
old_pip = item->pip;
|
|
|
|
item->pip = pip;
|
|
|
|
xfs_mru_cache_done(cache);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the AG has changed, drop the old ref and take a new one,
|
|
|
|
* effectively transferring the reference from old to new AG.
|
|
|
|
*/
|
|
|
|
if (ag != old_ag) {
|
|
|
|
xfs_filestream_put_ag(mp, old_ag);
|
|
|
|
xfs_filestream_get_ag(mp, ag);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If ip is a file and its pip has changed, drop the old ref and
|
|
|
|
* take a new one.
|
|
|
|
*/
|
|
|
|
if (pip && pip != old_pip) {
|
|
|
|
IRELE(old_pip);
|
|
|
|
IHOLD(pip);
|
|
|
|
}
|
|
|
|
|
|
|
|
TRACE_UPDATE(mp, ip, old_ag, xfs_filestream_peek_ag(mp, old_ag),
|
|
|
|
ag, xfs_filestream_peek_ag(mp, ag));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
item = kmem_zone_zalloc(item_zone, KM_MAYFAIL);
|
|
|
|
if (!item)
|
|
|
|
return ENOMEM;
|
|
|
|
|
|
|
|
item->ag = ag;
|
|
|
|
item->ip = ip;
|
|
|
|
item->pip = pip;
|
|
|
|
|
|
|
|
err = xfs_mru_cache_insert(cache, ip->i_ino, item);
|
|
|
|
if (err) {
|
|
|
|
kmem_zone_free(item_zone, item);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Take a reference on the AG. */
|
|
|
|
xfs_filestream_get_ag(mp, ag);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Take a reference on the inode itself regardless of whether it's a
|
|
|
|
* regular file or a directory.
|
|
|
|
*/
|
|
|
|
IHOLD(ip);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* In the case of a regular file, take a reference on the parent inode
|
|
|
|
* as well to ensure it remains in-core.
|
|
|
|
*/
|
|
|
|
if (pip)
|
|
|
|
IHOLD(pip);
|
|
|
|
|
|
|
|
TRACE_UPDATE(mp, ip, ag, xfs_filestream_peek_ag(mp, ag),
|
|
|
|
ag, xfs_filestream_peek_ag(mp, ag));
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* xfs_fstrm_free_func(): callback for freeing cached stream items. */
|
2007-11-23 06:28:09 +01:00
|
|
|
STATIC void
|
2007-07-11 03:09:12 +02:00
|
|
|
xfs_fstrm_free_func(
|
2007-08-30 09:21:38 +02:00
|
|
|
unsigned long ino,
|
|
|
|
void *data)
|
2007-07-11 03:09:12 +02:00
|
|
|
{
|
2007-08-30 09:21:38 +02:00
|
|
|
fstrm_item_t *item = (fstrm_item_t *)data;
|
2007-07-11 03:09:12 +02:00
|
|
|
xfs_inode_t *ip = item->ip;
|
|
|
|
|
|
|
|
ASSERT(ip->i_ino == ino);
|
|
|
|
|
|
|
|
xfs_iflags_clear(ip, XFS_IFILESTREAM);
|
|
|
|
|
|
|
|
/* Drop the reference taken on the AG when the item was added. */
|
2010-07-20 09:31:01 +02:00
|
|
|
xfs_filestream_put_ag(ip->i_mount, item->ag);
|
2007-07-11 03:09:12 +02:00
|
|
|
|
|
|
|
TRACE_FREE(ip->i_mount, ip, item->pip, item->ag,
|
|
|
|
xfs_filestream_peek_ag(ip->i_mount, item->ag));
|
|
|
|
|
|
|
|
/*
|
|
|
|
* _xfs_filestream_update_ag() always takes a reference on the inode
|
|
|
|
* itself, whether it's a file or a directory. Release it here.
|
|
|
|
* This can result in the inode being freed and so we must
|
|
|
|
* not hold any inode locks when freeing filesstreams objects
|
|
|
|
* otherwise we can deadlock here.
|
|
|
|
*/
|
|
|
|
IRELE(ip);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* In the case of a regular file, _xfs_filestream_update_ag() also
|
|
|
|
* takes a ref on the parent inode to keep it in-core. Release that
|
|
|
|
* too.
|
|
|
|
*/
|
|
|
|
if (item->pip)
|
|
|
|
IRELE(item->pip);
|
|
|
|
|
|
|
|
/* Finally, free the memory allocated for the item. */
|
|
|
|
kmem_zone_free(item_zone, item);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* xfs_filestream_init() is called at xfs initialisation time to set up the
|
|
|
|
* memory zone that will be used for filestream data structure allocation.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
xfs_filestream_init(void)
|
|
|
|
{
|
|
|
|
item_zone = kmem_zone_init(sizeof(fstrm_item_t), "fstrm_item");
|
2008-07-18 09:11:46 +02:00
|
|
|
if (!item_zone)
|
|
|
|
return -ENOMEM;
|
2009-12-15 00:14:59 +01:00
|
|
|
|
2008-07-18 09:11:46 +02:00
|
|
|
return 0;
|
2007-07-11 03:09:12 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* xfs_filestream_uninit() is called at xfs termination time to destroy the
|
|
|
|
* memory zone that was used for filestream data structure allocation.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
xfs_filestream_uninit(void)
|
|
|
|
{
|
|
|
|
kmem_zone_destroy(item_zone);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* xfs_filestream_mount() is called when a file system is mounted with the
|
|
|
|
* filestream option. It is responsible for allocating the data structures
|
|
|
|
* needed to track the new file system's file streams.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
xfs_filestream_mount(
|
|
|
|
xfs_mount_t *mp)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
unsigned int lifetime, grp_count;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* The filestream timer tunable is currently fixed within the range of
|
|
|
|
* one second to four minutes, with five seconds being the default. The
|
|
|
|
* group count is somewhat arbitrary, but it'd be nice to adhere to the
|
|
|
|
* timer tunable to within about 10 percent. This requires at least 10
|
|
|
|
* groups.
|
|
|
|
*/
|
|
|
|
lifetime = xfs_fstrm_centisecs * 10;
|
|
|
|
grp_count = 10;
|
|
|
|
|
|
|
|
err = xfs_mru_cache_create(&mp->m_filestream, lifetime, grp_count,
|
2007-08-30 09:21:38 +02:00
|
|
|
xfs_fstrm_free_func);
|
2007-07-11 03:09:12 +02:00
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* xfs_filestream_unmount() is called when a file system that was mounted with
|
|
|
|
* the filestream option is unmounted. It drains the data structures created
|
|
|
|
* to track the file system's file streams and frees all the memory that was
|
|
|
|
* allocated.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
xfs_filestream_unmount(
|
|
|
|
xfs_mount_t *mp)
|
|
|
|
{
|
|
|
|
xfs_mru_cache_destroy(mp->m_filestream);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Return the AG of the filestream the file or directory belongs to, or
|
|
|
|
* NULLAGNUMBER otherwise.
|
|
|
|
*/
|
|
|
|
xfs_agnumber_t
|
|
|
|
xfs_filestream_lookup_ag(
|
|
|
|
xfs_inode_t *ip)
|
|
|
|
{
|
|
|
|
xfs_mru_cache_t *cache;
|
|
|
|
fstrm_item_t *item;
|
|
|
|
xfs_agnumber_t ag;
|
|
|
|
int ref;
|
|
|
|
|
2011-07-26 02:54:24 +02:00
|
|
|
if (!S_ISREG(ip->i_d.di_mode) && !S_ISDIR(ip->i_d.di_mode)) {
|
2007-07-11 03:09:12 +02:00
|
|
|
ASSERT(0);
|
|
|
|
return NULLAGNUMBER;
|
|
|
|
}
|
|
|
|
|
|
|
|
cache = ip->i_mount->m_filestream;
|
|
|
|
item = xfs_mru_cache_lookup(cache, ip->i_ino);
|
|
|
|
if (!item) {
|
|
|
|
TRACE_LOOKUP(ip->i_mount, ip, NULL, NULLAGNUMBER, 0);
|
|
|
|
return NULLAGNUMBER;
|
|
|
|
}
|
|
|
|
|
|
|
|
ASSERT(ip == item->ip);
|
|
|
|
ag = item->ag;
|
|
|
|
ref = xfs_filestream_peek_ag(ip->i_mount, ag);
|
|
|
|
xfs_mru_cache_done(cache);
|
|
|
|
|
|
|
|
TRACE_LOOKUP(ip->i_mount, ip, item->pip, ag, ref);
|
|
|
|
return ag;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* xfs_filestream_associate() should only be called to associate a regular file
|
|
|
|
* with its parent directory. Calling it with a child directory isn't
|
|
|
|
* appropriate because filestreams don't apply to entire directory hierarchies.
|
|
|
|
* Creating a file in a child directory of an existing filestream directory
|
|
|
|
* starts a new filestream with its own allocation group association.
|
|
|
|
*
|
|
|
|
* Returns < 0 on error, 0 if successful association occurred, > 0 if
|
|
|
|
* we failed to get an association because of locking issues.
|
|
|
|
*/
|
|
|
|
int
|
|
|
|
xfs_filestream_associate(
|
|
|
|
xfs_inode_t *pip,
|
|
|
|
xfs_inode_t *ip)
|
|
|
|
{
|
|
|
|
xfs_mount_t *mp;
|
|
|
|
xfs_mru_cache_t *cache;
|
|
|
|
fstrm_item_t *item;
|
|
|
|
xfs_agnumber_t ag, rotorstep, startag;
|
|
|
|
int err = 0;
|
|
|
|
|
2011-07-26 02:54:24 +02:00
|
|
|
ASSERT(S_ISDIR(pip->i_d.di_mode));
|
|
|
|
ASSERT(S_ISREG(ip->i_d.di_mode));
|
|
|
|
if (!S_ISDIR(pip->i_d.di_mode) || !S_ISREG(ip->i_d.di_mode))
|
2007-07-11 03:09:12 +02:00
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
mp = pip->i_mount;
|
|
|
|
cache = mp->m_filestream;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* We have a problem, Houston.
|
|
|
|
*
|
|
|
|
* Taking the iolock here violates inode locking order - we already
|
|
|
|
* hold the ilock. Hence if we block getting this lock we may never
|
|
|
|
* wake. Unfortunately, that means if we can't get the lock, we're
|
|
|
|
* screwed in terms of getting a stream association - we can't spin
|
|
|
|
* waiting for the lock because someone else is waiting on the lock we
|
|
|
|
* hold and we cannot drop that as we are in a transaction here.
|
|
|
|
*
|
2009-06-08 15:35:48 +02:00
|
|
|
* Lucky for us, this inversion is not a problem because it's a
|
|
|
|
* directory inode that we are trying to lock here.
|
2007-07-11 03:09:12 +02:00
|
|
|
*
|
|
|
|
* So, if we can't get the iolock without sleeping then just give up
|
|
|
|
*/
|
2010-01-11 12:47:44 +01:00
|
|
|
if (!xfs_ilock_nowait(pip, XFS_IOLOCK_EXCL))
|
2007-07-11 03:09:12 +02:00
|
|
|
return 1;
|
|
|
|
|
|
|
|
/* If the parent directory is already in the cache, use its AG. */
|
|
|
|
item = xfs_mru_cache_lookup(cache, pip->i_ino);
|
|
|
|
if (item) {
|
|
|
|
ASSERT(item->ip == pip);
|
|
|
|
ag = item->ag;
|
|
|
|
xfs_mru_cache_done(cache);
|
|
|
|
|
|
|
|
TRACE_LOOKUP(mp, pip, pip, ag, xfs_filestream_peek_ag(mp, ag));
|
|
|
|
err = _xfs_filestream_update_ag(ip, pip, ag);
|
|
|
|
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Set the starting AG using the rotor for inode32, otherwise
|
|
|
|
* use the directory inode's AG.
|
|
|
|
*/
|
|
|
|
if (mp->m_flags & XFS_MOUNT_32BITINODES) {
|
|
|
|
rotorstep = xfs_rotorstep;
|
|
|
|
startag = (mp->m_agfrotor / rotorstep) % mp->m_sb.sb_agcount;
|
|
|
|
mp->m_agfrotor = (mp->m_agfrotor + 1) %
|
|
|
|
(mp->m_sb.sb_agcount * rotorstep);
|
|
|
|
} else
|
|
|
|
startag = XFS_INO_TO_AGNO(mp, pip->i_ino);
|
|
|
|
|
|
|
|
/* Pick a new AG for the parent inode starting at startag. */
|
|
|
|
err = _xfs_filestream_pick_ag(mp, startag, &ag, 0, 0);
|
|
|
|
if (err || ag == NULLAGNUMBER)
|
|
|
|
goto exit_did_pick;
|
|
|
|
|
|
|
|
/* Associate the parent inode with the AG. */
|
|
|
|
err = _xfs_filestream_update_ag(pip, NULL, ag);
|
|
|
|
if (err)
|
|
|
|
goto exit_did_pick;
|
|
|
|
|
|
|
|
/* Associate the file inode with the AG. */
|
|
|
|
err = _xfs_filestream_update_ag(ip, pip, ag);
|
|
|
|
if (err)
|
|
|
|
goto exit_did_pick;
|
|
|
|
|
|
|
|
TRACE_ASSOCIATE(mp, ip, pip, ag, xfs_filestream_peek_ag(mp, ag));
|
|
|
|
|
|
|
|
exit_did_pick:
|
|
|
|
/*
|
|
|
|
* If _xfs_filestream_pick_ag() returned a valid AG, remove the
|
|
|
|
* reference it took on it, since the file and directory will have taken
|
|
|
|
* their own now if they were successfully cached.
|
|
|
|
*/
|
|
|
|
if (ag != NULLAGNUMBER)
|
|
|
|
xfs_filestream_put_ag(mp, ag);
|
|
|
|
|
|
|
|
exit:
|
|
|
|
xfs_iunlock(pip, XFS_IOLOCK_EXCL);
|
|
|
|
return -err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Pick a new allocation group for the current file and its file stream. This
|
|
|
|
* function is called by xfs_bmap_filestreams() with the mount point's per-ag
|
|
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|
* lock held.
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|
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|
*/
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|
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|
int
|
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|
|
xfs_filestream_new_ag(
|
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|
xfs_bmalloca_t *ap,
|
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|
|
xfs_agnumber_t *agp)
|
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|
|
{
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|
int flags, err;
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|
xfs_inode_t *ip, *pip = NULL;
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|
xfs_mount_t *mp;
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|
xfs_mru_cache_t *cache;
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xfs_extlen_t minlen;
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|
fstrm_item_t *dir, *file;
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|
xfs_agnumber_t ag = NULLAGNUMBER;
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|
ip = ap->ip;
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mp = ip->i_mount;
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cache = mp->m_filestream;
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|
minlen = ap->alen;
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|
*agp = NULLAGNUMBER;
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/*
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* Look for the file in the cache, removing it if it's found. Doing
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|
* this allows it to be held across the dir lookup that follows.
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*/
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file = xfs_mru_cache_remove(cache, ip->i_ino);
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|
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if (file) {
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ASSERT(ip == file->ip);
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/* Save the file's parent inode and old AG number for later. */
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|
pip = file->pip;
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ag = file->ag;
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/* Look for the file's directory in the cache. */
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dir = xfs_mru_cache_lookup(cache, pip->i_ino);
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|
|
if (dir) {
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|
|
ASSERT(pip == dir->ip);
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/*
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|
* If the directory has already moved on to a new AG,
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|
|
* use that AG as the new AG for the file. Don't
|
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|
|
* forget to twiddle the AG refcounts to match the
|
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|
|
* movement.
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|
|
|
*/
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|
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if (dir->ag != file->ag) {
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|
xfs_filestream_put_ag(mp, file->ag);
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|
xfs_filestream_get_ag(mp, dir->ag);
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|
|
*agp = file->ag = dir->ag;
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|
|
}
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|
|
xfs_mru_cache_done(cache);
|
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|
|
}
|
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|
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|
|
/*
|
|
|
|
* Put the file back in the cache. If this fails, the free
|
|
|
|
* function needs to be called to tidy up in the same way as if
|
|
|
|
* the item had simply expired from the cache.
|
|
|
|
*/
|
|
|
|
err = xfs_mru_cache_insert(cache, ip->i_ino, file);
|
|
|
|
if (err) {
|
|
|
|
xfs_fstrm_free_func(ip->i_ino, file);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the file's AG was moved to the directory's new AG, there's
|
|
|
|
* nothing more to be done.
|
|
|
|
*/
|
|
|
|
if (*agp != NULLAGNUMBER) {
|
|
|
|
TRACE_MOVEAG(mp, ip, pip,
|
|
|
|
ag, xfs_filestream_peek_ag(mp, ag),
|
|
|
|
*agp, xfs_filestream_peek_ag(mp, *agp));
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the file's parent directory is known, take its iolock in exclusive
|
|
|
|
* mode to prevent two sibling files from racing each other to migrate
|
|
|
|
* themselves and their parent to different AGs.
|
2010-11-06 12:42:44 +01:00
|
|
|
*
|
|
|
|
* Note that we lock the parent directory iolock inside the child
|
|
|
|
* iolock here. That's fine as we never hold both parent and child
|
|
|
|
* iolock in any other place. This is different from the ilock,
|
|
|
|
* which requires locking of the child after the parent for namespace
|
|
|
|
* operations.
|
2007-07-11 03:09:12 +02:00
|
|
|
*/
|
|
|
|
if (pip)
|
2010-11-06 12:42:44 +01:00
|
|
|
xfs_ilock(pip, XFS_IOLOCK_EXCL | XFS_IOLOCK_PARENT);
|
2007-07-11 03:09:12 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* A new AG needs to be found for the file. If the file's parent
|
|
|
|
* directory is also known, it will be moved to the new AG as well to
|
|
|
|
* ensure that files created inside it in future use the new AG.
|
|
|
|
*/
|
|
|
|
ag = (ag == NULLAGNUMBER) ? 0 : (ag + 1) % mp->m_sb.sb_agcount;
|
|
|
|
flags = (ap->userdata ? XFS_PICK_USERDATA : 0) |
|
|
|
|
(ap->low ? XFS_PICK_LOWSPACE : 0);
|
|
|
|
|
|
|
|
err = _xfs_filestream_pick_ag(mp, ag, agp, flags, minlen);
|
|
|
|
if (err || *agp == NULLAGNUMBER)
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* If the file wasn't found in the file cache, then its parent directory
|
|
|
|
* inode isn't known. For this to have happened, the file must either
|
|
|
|
* be pre-existing, or it was created long enough ago that its cache
|
|
|
|
* entry has expired. This isn't the sort of usage that the filestreams
|
|
|
|
* allocator is trying to optimise, so there's no point trying to track
|
|
|
|
* its new AG somehow in the filestream data structures.
|
|
|
|
*/
|
|
|
|
if (!pip) {
|
|
|
|
TRACE_ORPHAN(mp, ip, *agp);
|
|
|
|
goto exit;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Associate the parent inode with the AG. */
|
|
|
|
err = _xfs_filestream_update_ag(pip, NULL, *agp);
|
|
|
|
if (err)
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
/* Associate the file inode with the AG. */
|
|
|
|
err = _xfs_filestream_update_ag(ip, pip, *agp);
|
|
|
|
if (err)
|
|
|
|
goto exit;
|
|
|
|
|
|
|
|
TRACE_MOVEAG(mp, ip, pip, NULLAGNUMBER, 0,
|
|
|
|
*agp, xfs_filestream_peek_ag(mp, *agp));
|
|
|
|
|
|
|
|
exit:
|
|
|
|
/*
|
|
|
|
* If _xfs_filestream_pick_ag() returned a valid AG, remove the
|
|
|
|
* reference it took on it, since the file and directory will have taken
|
|
|
|
* their own now if they were successfully cached.
|
|
|
|
*/
|
|
|
|
if (*agp != NULLAGNUMBER)
|
|
|
|
xfs_filestream_put_ag(mp, *agp);
|
|
|
|
else
|
|
|
|
*agp = 0;
|
|
|
|
|
|
|
|
if (pip)
|
|
|
|
xfs_iunlock(pip, XFS_IOLOCK_EXCL);
|
|
|
|
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Remove an association between an inode and a filestream object.
|
|
|
|
* Typically this is done on last close of an unlinked file.
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
xfs_filestream_deassociate(
|
|
|
|
xfs_inode_t *ip)
|
|
|
|
{
|
|
|
|
xfs_mru_cache_t *cache = ip->i_mount->m_filestream;
|
|
|
|
|
|
|
|
xfs_mru_cache_delete(cache, ip->i_ino);
|
|
|
|
}
|