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3e3673e302
Now that bma.dfops is only assigned from ->t_dfops, replace all accesses to the former with the latter and remove the unnecessary field. This patch does not change behavior. Signed-off-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
427 lines
11 KiB
C
427 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2006-2007 Silicon Graphics, Inc.
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* Copyright (c) 2014 Christoph Hellwig.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_sb.h"
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#include "xfs_mount.h"
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#include "xfs_defer.h"
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#include "xfs_inode.h"
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#include "xfs_bmap.h"
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#include "xfs_bmap_util.h"
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#include "xfs_alloc.h"
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#include "xfs_mru_cache.h"
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#include "xfs_filestream.h"
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#include "xfs_trace.h"
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#include "xfs_ag_resv.h"
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#include "xfs_trans.h"
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struct xfs_fstrm_item {
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struct xfs_mru_cache_elem mru;
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xfs_agnumber_t ag; /* AG in use for this directory */
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};
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enum xfs_fstrm_alloc {
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XFS_PICK_USERDATA = 1,
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XFS_PICK_LOWSPACE = 2,
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};
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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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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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static void
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xfs_fstrm_free_func(
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void *data,
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struct xfs_mru_cache_elem *mru)
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{
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struct xfs_mount *mp = data;
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struct xfs_fstrm_item *item =
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container_of(mru, struct xfs_fstrm_item, mru);
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xfs_filestream_put_ag(mp, item->ag);
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trace_xfs_filestream_free(mp, mru->key, item->ag);
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kmem_free(item);
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}
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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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struct xfs_inode *ip,
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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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struct xfs_mount *mp = ip->i_mount;
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struct xfs_fstrm_item *item;
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struct xfs_perag *pag;
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xfs_extlen_t longest, free = 0, minfree, maxfree = 0;
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xfs_agnumber_t ag, max_ag = NULLAGNUMBER;
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int err, trylock, nscan;
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ASSERT(S_ISDIR(VFS_I(ip)->i_mode));
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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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trace_xfs_filestream_scan(mp, ip->i_ino, ag);
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pag = xfs_perag_get(mp, ag);
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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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if (err && !trylock) {
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xfs_perag_put(pag);
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return err;
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}
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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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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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longest = xfs_alloc_longest_free_extent(pag,
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xfs_alloc_min_freelist(mp, pag),
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xfs_ag_resv_needed(pag, XFS_AG_RESV_NONE));
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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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xfs_perag_put(pag);
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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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xfs_perag_put(pag);
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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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free = maxfree;
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*agp = max_ag;
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break;
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}
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/* take AG 0 if none matched */
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trace_xfs_filestream_pick(ip, *agp, free, nscan);
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*agp = 0;
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return 0;
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}
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trace_xfs_filestream_pick(ip, *agp, free, nscan);
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if (*agp == NULLAGNUMBER)
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return 0;
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err = -ENOMEM;
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item = kmem_alloc(sizeof(*item), KM_MAYFAIL);
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if (!item)
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goto out_put_ag;
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item->ag = *agp;
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err = xfs_mru_cache_insert(mp->m_filestream, ip->i_ino, &item->mru);
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if (err) {
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if (err == -EEXIST)
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err = 0;
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goto out_free_item;
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}
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return 0;
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out_free_item:
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kmem_free(item);
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out_put_ag:
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xfs_filestream_put_ag(mp, *agp);
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return err;
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}
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static struct xfs_inode *
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xfs_filestream_get_parent(
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struct xfs_inode *ip)
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{
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struct inode *inode = VFS_I(ip), *dir = NULL;
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struct dentry *dentry, *parent;
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dentry = d_find_alias(inode);
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if (!dentry)
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goto out;
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parent = dget_parent(dentry);
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if (!parent)
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goto out_dput;
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dir = igrab(d_inode(parent));
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dput(parent);
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out_dput:
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dput(dentry);
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out:
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return dir ? XFS_I(dir) : NULL;
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}
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/*
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* Find the right allocation group for a file, either by finding an
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* existing file stream or creating a new one.
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*
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* Returns NULLAGNUMBER in case of an error.
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*/
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xfs_agnumber_t
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xfs_filestream_lookup_ag(
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struct xfs_inode *ip)
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{
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_inode *pip = NULL;
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xfs_agnumber_t startag, ag = NULLAGNUMBER;
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struct xfs_mru_cache_elem *mru;
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ASSERT(S_ISREG(VFS_I(ip)->i_mode));
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pip = xfs_filestream_get_parent(ip);
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if (!pip)
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return NULLAGNUMBER;
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mru = xfs_mru_cache_lookup(mp->m_filestream, pip->i_ino);
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if (mru) {
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ag = container_of(mru, struct xfs_fstrm_item, mru)->ag;
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xfs_mru_cache_done(mp->m_filestream);
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trace_xfs_filestream_lookup(mp, ip->i_ino, ag);
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goto out;
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}
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/*
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* Set the starting AG using the rotor for inode32, otherwise
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* use the directory inode's AG.
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*/
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if (mp->m_flags & XFS_MOUNT_32BITINODES) {
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xfs_agnumber_t rotorstep = xfs_rotorstep;
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startag = (mp->m_agfrotor / rotorstep) % mp->m_sb.sb_agcount;
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mp->m_agfrotor = (mp->m_agfrotor + 1) %
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(mp->m_sb.sb_agcount * rotorstep);
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} else
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startag = XFS_INO_TO_AGNO(mp, pip->i_ino);
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if (xfs_filestream_pick_ag(pip, startag, &ag, 0, 0))
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ag = NULLAGNUMBER;
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out:
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IRELE(pip);
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return ag;
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}
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/*
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* Pick a new allocation group for the current file and its file stream.
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*
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* This is called when the allocator can't find a suitable extent in the
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* current AG, and we have to move the stream into a new AG with more space.
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*/
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int
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xfs_filestream_new_ag(
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struct xfs_bmalloca *ap,
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xfs_agnumber_t *agp)
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{
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struct xfs_inode *ip = ap->ip, *pip;
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struct xfs_mount *mp = ip->i_mount;
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xfs_extlen_t minlen = ap->length;
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xfs_agnumber_t startag = 0;
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int flags = 0;
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int err = 0;
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struct xfs_mru_cache_elem *mru;
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*agp = NULLAGNUMBER;
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pip = xfs_filestream_get_parent(ip);
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if (!pip)
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goto exit;
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mru = xfs_mru_cache_remove(mp->m_filestream, pip->i_ino);
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if (mru) {
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struct xfs_fstrm_item *item =
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container_of(mru, struct xfs_fstrm_item, mru);
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startag = (item->ag + 1) % mp->m_sb.sb_agcount;
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}
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if (xfs_alloc_is_userdata(ap->datatype))
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flags |= XFS_PICK_USERDATA;
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if (ap->tp->t_dfops->dop_low)
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flags |= XFS_PICK_LOWSPACE;
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err = xfs_filestream_pick_ag(pip, startag, agp, flags, minlen);
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/*
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* Only free the item here so we skip over the old AG earlier.
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*/
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if (mru)
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xfs_fstrm_free_func(mp, mru);
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IRELE(pip);
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exit:
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if (*agp == NULLAGNUMBER)
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*agp = 0;
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return err;
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}
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void
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xfs_filestream_deassociate(
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struct xfs_inode *ip)
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{
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xfs_mru_cache_delete(ip->i_mount->m_filestream, ip->i_ino);
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}
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int
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xfs_filestream_mount(
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xfs_mount_t *mp)
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{
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/*
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* The filestream timer tunable is currently fixed within the range of
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* one second to four minutes, with five seconds being the default. The
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* group count is somewhat arbitrary, but it'd be nice to adhere to the
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* timer tunable to within about 10 percent. This requires at least 10
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* groups.
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*/
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return xfs_mru_cache_create(&mp->m_filestream, mp,
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xfs_fstrm_centisecs * 10, 10, xfs_fstrm_free_func);
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}
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void
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xfs_filestream_unmount(
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xfs_mount_t *mp)
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{
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xfs_mru_cache_destroy(mp->m_filestream);
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}
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