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0fa4a10a2f
Since xfs_inode_free_eofblocks and xfs_inode_free_cowblocks are now internal static functions, we can save ourselves a cycling of the iolock by passing the lock state out to xfs_blockgc_scan_inode and letting it do all the unlocking. Signed-off-by: Darrick J. Wong <djwong@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de>
1708 lines
43 KiB
C
1708 lines
43 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_shared.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_inode.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_inode_item.h"
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#include "xfs_quota.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_bmap_util.h"
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#include "xfs_dquot_item.h"
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#include "xfs_dquot.h"
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#include "xfs_reflink.h"
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#include "xfs_ialloc.h"
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#include <linux/iversion.h>
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/*
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* Allocate and initialise an xfs_inode.
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*/
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struct xfs_inode *
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xfs_inode_alloc(
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struct xfs_mount *mp,
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xfs_ino_t ino)
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{
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struct xfs_inode *ip;
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/*
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* XXX: If this didn't occur in transactions, we could drop GFP_NOFAIL
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* and return NULL here on ENOMEM.
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*/
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ip = kmem_cache_alloc(xfs_inode_zone, GFP_KERNEL | __GFP_NOFAIL);
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if (inode_init_always(mp->m_super, VFS_I(ip))) {
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kmem_cache_free(xfs_inode_zone, ip);
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return NULL;
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}
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/* VFS doesn't initialise i_mode! */
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VFS_I(ip)->i_mode = 0;
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XFS_STATS_INC(mp, vn_active);
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ASSERT(atomic_read(&ip->i_pincount) == 0);
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ASSERT(ip->i_ino == 0);
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/* initialise the xfs inode */
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ip->i_ino = ino;
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ip->i_mount = mp;
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memset(&ip->i_imap, 0, sizeof(struct xfs_imap));
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ip->i_afp = NULL;
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ip->i_cowfp = NULL;
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memset(&ip->i_df, 0, sizeof(ip->i_df));
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ip->i_flags = 0;
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ip->i_delayed_blks = 0;
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memset(&ip->i_d, 0, sizeof(ip->i_d));
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ip->i_sick = 0;
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ip->i_checked = 0;
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INIT_WORK(&ip->i_ioend_work, xfs_end_io);
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INIT_LIST_HEAD(&ip->i_ioend_list);
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spin_lock_init(&ip->i_ioend_lock);
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return ip;
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}
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STATIC void
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xfs_inode_free_callback(
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struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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struct xfs_inode *ip = XFS_I(inode);
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switch (VFS_I(ip)->i_mode & S_IFMT) {
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case S_IFREG:
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case S_IFDIR:
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case S_IFLNK:
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xfs_idestroy_fork(&ip->i_df);
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break;
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}
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if (ip->i_afp) {
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xfs_idestroy_fork(ip->i_afp);
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kmem_cache_free(xfs_ifork_zone, ip->i_afp);
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}
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if (ip->i_cowfp) {
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xfs_idestroy_fork(ip->i_cowfp);
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kmem_cache_free(xfs_ifork_zone, ip->i_cowfp);
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}
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if (ip->i_itemp) {
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ASSERT(!test_bit(XFS_LI_IN_AIL,
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&ip->i_itemp->ili_item.li_flags));
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xfs_inode_item_destroy(ip);
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ip->i_itemp = NULL;
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}
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kmem_cache_free(xfs_inode_zone, ip);
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}
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static void
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__xfs_inode_free(
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struct xfs_inode *ip)
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{
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/* asserts to verify all state is correct here */
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ASSERT(atomic_read(&ip->i_pincount) == 0);
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ASSERT(!ip->i_itemp || list_empty(&ip->i_itemp->ili_item.li_bio_list));
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XFS_STATS_DEC(ip->i_mount, vn_active);
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call_rcu(&VFS_I(ip)->i_rcu, xfs_inode_free_callback);
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}
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void
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xfs_inode_free(
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struct xfs_inode *ip)
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{
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ASSERT(!xfs_iflags_test(ip, XFS_IFLUSHING));
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/*
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* Because we use RCU freeing we need to ensure the inode always
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* appears to be reclaimed with an invalid inode number when in the
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* free state. The ip->i_flags_lock provides the barrier against lookup
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* races.
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*/
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spin_lock(&ip->i_flags_lock);
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ip->i_flags = XFS_IRECLAIM;
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ip->i_ino = 0;
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spin_unlock(&ip->i_flags_lock);
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__xfs_inode_free(ip);
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}
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/*
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* Queue background inode reclaim work if there are reclaimable inodes and there
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* isn't reclaim work already scheduled or in progress.
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*/
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static void
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xfs_reclaim_work_queue(
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struct xfs_mount *mp)
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{
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rcu_read_lock();
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if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_RECLAIM_TAG)) {
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queue_delayed_work(mp->m_reclaim_workqueue, &mp->m_reclaim_work,
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msecs_to_jiffies(xfs_syncd_centisecs / 6 * 10));
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}
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rcu_read_unlock();
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}
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static void
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xfs_perag_set_reclaim_tag(
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struct xfs_perag *pag)
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{
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struct xfs_mount *mp = pag->pag_mount;
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lockdep_assert_held(&pag->pag_ici_lock);
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if (pag->pag_ici_reclaimable++)
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return;
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/* propagate the reclaim tag up into the perag radix tree */
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spin_lock(&mp->m_perag_lock);
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radix_tree_tag_set(&mp->m_perag_tree, pag->pag_agno,
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XFS_ICI_RECLAIM_TAG);
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spin_unlock(&mp->m_perag_lock);
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/* schedule periodic background inode reclaim */
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xfs_reclaim_work_queue(mp);
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trace_xfs_perag_set_reclaim(mp, pag->pag_agno, -1, _RET_IP_);
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}
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static void
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xfs_perag_clear_reclaim_tag(
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struct xfs_perag *pag)
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{
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struct xfs_mount *mp = pag->pag_mount;
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lockdep_assert_held(&pag->pag_ici_lock);
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if (--pag->pag_ici_reclaimable)
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return;
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/* clear the reclaim tag from the perag radix tree */
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spin_lock(&mp->m_perag_lock);
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radix_tree_tag_clear(&mp->m_perag_tree, pag->pag_agno,
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XFS_ICI_RECLAIM_TAG);
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spin_unlock(&mp->m_perag_lock);
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trace_xfs_perag_clear_reclaim(mp, pag->pag_agno, -1, _RET_IP_);
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}
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/*
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* We set the inode flag atomically with the radix tree tag.
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* Once we get tag lookups on the radix tree, this inode flag
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* can go away.
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*/
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void
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xfs_inode_set_reclaim_tag(
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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_perag *pag;
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pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
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spin_lock(&pag->pag_ici_lock);
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spin_lock(&ip->i_flags_lock);
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radix_tree_tag_set(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino),
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XFS_ICI_RECLAIM_TAG);
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xfs_perag_set_reclaim_tag(pag);
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__xfs_iflags_set(ip, XFS_IRECLAIMABLE);
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spin_unlock(&ip->i_flags_lock);
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spin_unlock(&pag->pag_ici_lock);
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xfs_perag_put(pag);
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}
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STATIC void
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xfs_inode_clear_reclaim_tag(
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struct xfs_perag *pag,
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xfs_ino_t ino)
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{
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radix_tree_tag_clear(&pag->pag_ici_root,
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XFS_INO_TO_AGINO(pag->pag_mount, ino),
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XFS_ICI_RECLAIM_TAG);
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xfs_perag_clear_reclaim_tag(pag);
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}
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static void
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xfs_inew_wait(
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struct xfs_inode *ip)
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{
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wait_queue_head_t *wq = bit_waitqueue(&ip->i_flags, __XFS_INEW_BIT);
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DEFINE_WAIT_BIT(wait, &ip->i_flags, __XFS_INEW_BIT);
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do {
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prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
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if (!xfs_iflags_test(ip, XFS_INEW))
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break;
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schedule();
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} while (true);
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finish_wait(wq, &wait.wq_entry);
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}
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/*
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* When we recycle a reclaimable inode, we need to re-initialise the VFS inode
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* part of the structure. This is made more complex by the fact we store
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* information about the on-disk values in the VFS inode and so we can't just
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* overwrite the values unconditionally. Hence we save the parameters we
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* need to retain across reinitialisation, and rewrite them into the VFS inode
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* after reinitialisation even if it fails.
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*/
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static int
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xfs_reinit_inode(
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struct xfs_mount *mp,
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struct inode *inode)
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{
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int error;
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uint32_t nlink = inode->i_nlink;
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uint32_t generation = inode->i_generation;
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uint64_t version = inode_peek_iversion(inode);
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umode_t mode = inode->i_mode;
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dev_t dev = inode->i_rdev;
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kuid_t uid = inode->i_uid;
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kgid_t gid = inode->i_gid;
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error = inode_init_always(mp->m_super, inode);
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set_nlink(inode, nlink);
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inode->i_generation = generation;
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inode_set_iversion_queried(inode, version);
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inode->i_mode = mode;
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inode->i_rdev = dev;
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inode->i_uid = uid;
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inode->i_gid = gid;
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return error;
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}
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/*
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* If we are allocating a new inode, then check what was returned is
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* actually a free, empty inode. If we are not allocating an inode,
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* then check we didn't find a free inode.
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*
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* Returns:
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* 0 if the inode free state matches the lookup context
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* -ENOENT if the inode is free and we are not allocating
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* -EFSCORRUPTED if there is any state mismatch at all
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*/
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static int
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xfs_iget_check_free_state(
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struct xfs_inode *ip,
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int flags)
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{
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if (flags & XFS_IGET_CREATE) {
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/* should be a free inode */
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if (VFS_I(ip)->i_mode != 0) {
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xfs_warn(ip->i_mount,
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"Corruption detected! Free inode 0x%llx not marked free! (mode 0x%x)",
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ip->i_ino, VFS_I(ip)->i_mode);
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return -EFSCORRUPTED;
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}
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if (ip->i_d.di_nblocks != 0) {
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xfs_warn(ip->i_mount,
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"Corruption detected! Free inode 0x%llx has blocks allocated!",
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ip->i_ino);
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return -EFSCORRUPTED;
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}
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return 0;
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}
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/* should be an allocated inode */
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if (VFS_I(ip)->i_mode == 0)
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return -ENOENT;
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return 0;
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}
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/*
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* Check the validity of the inode we just found it the cache
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*/
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static int
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xfs_iget_cache_hit(
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struct xfs_perag *pag,
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struct xfs_inode *ip,
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xfs_ino_t ino,
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int flags,
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int lock_flags) __releases(RCU)
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{
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struct inode *inode = VFS_I(ip);
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struct xfs_mount *mp = ip->i_mount;
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int error;
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/*
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* check for re-use of an inode within an RCU grace period due to the
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* radix tree nodes not being updated yet. We monitor for this by
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* setting the inode number to zero before freeing the inode structure.
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* If the inode has been reallocated and set up, then the inode number
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* will not match, so check for that, too.
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*/
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spin_lock(&ip->i_flags_lock);
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if (ip->i_ino != ino) {
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trace_xfs_iget_skip(ip);
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XFS_STATS_INC(mp, xs_ig_frecycle);
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error = -EAGAIN;
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goto out_error;
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}
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/*
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* If we are racing with another cache hit that is currently
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* instantiating this inode or currently recycling it out of
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* reclaimabe state, wait for the initialisation to complete
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* before continuing.
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*
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* XXX(hch): eventually we should do something equivalent to
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* wait_on_inode to wait for these flags to be cleared
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* instead of polling for it.
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*/
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if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) {
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trace_xfs_iget_skip(ip);
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XFS_STATS_INC(mp, xs_ig_frecycle);
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error = -EAGAIN;
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goto out_error;
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}
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/*
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* Check the inode free state is valid. This also detects lookup
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* racing with unlinks.
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*/
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error = xfs_iget_check_free_state(ip, flags);
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if (error)
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goto out_error;
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/*
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* If IRECLAIMABLE is set, we've torn down the VFS inode already.
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* Need to carefully get it back into useable state.
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*/
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if (ip->i_flags & XFS_IRECLAIMABLE) {
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trace_xfs_iget_reclaim(ip);
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if (flags & XFS_IGET_INCORE) {
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error = -EAGAIN;
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goto out_error;
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}
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/*
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* We need to set XFS_IRECLAIM to prevent xfs_reclaim_inode
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* from stomping over us while we recycle the inode. We can't
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* clear the radix tree reclaimable tag yet as it requires
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* pag_ici_lock to be held exclusive.
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*/
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ip->i_flags |= XFS_IRECLAIM;
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spin_unlock(&ip->i_flags_lock);
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rcu_read_unlock();
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ASSERT(!rwsem_is_locked(&inode->i_rwsem));
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error = xfs_reinit_inode(mp, inode);
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if (error) {
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bool wake;
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/*
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* Re-initializing the inode failed, and we are in deep
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* trouble. Try to re-add it to the reclaim list.
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*/
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rcu_read_lock();
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spin_lock(&ip->i_flags_lock);
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wake = !!__xfs_iflags_test(ip, XFS_INEW);
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ip->i_flags &= ~(XFS_INEW | XFS_IRECLAIM);
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if (wake)
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wake_up_bit(&ip->i_flags, __XFS_INEW_BIT);
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ASSERT(ip->i_flags & XFS_IRECLAIMABLE);
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trace_xfs_iget_reclaim_fail(ip);
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goto out_error;
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}
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|
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spin_lock(&pag->pag_ici_lock);
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spin_lock(&ip->i_flags_lock);
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|
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/*
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* Clear the per-lifetime state in the inode as we are now
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* effectively a new inode and need to return to the initial
|
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* state before reuse occurs.
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*/
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ip->i_flags &= ~XFS_IRECLAIM_RESET_FLAGS;
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ip->i_flags |= XFS_INEW;
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xfs_inode_clear_reclaim_tag(pag, ip->i_ino);
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inode->i_state = I_NEW;
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ip->i_sick = 0;
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ip->i_checked = 0;
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|
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spin_unlock(&ip->i_flags_lock);
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spin_unlock(&pag->pag_ici_lock);
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} else {
|
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/* If the VFS inode is being torn down, pause and try again. */
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if (!igrab(inode)) {
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trace_xfs_iget_skip(ip);
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error = -EAGAIN;
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goto out_error;
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}
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|
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/* We've got a live one. */
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spin_unlock(&ip->i_flags_lock);
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rcu_read_unlock();
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trace_xfs_iget_hit(ip);
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}
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|
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if (lock_flags != 0)
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xfs_ilock(ip, lock_flags);
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|
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if (!(flags & XFS_IGET_INCORE))
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xfs_iflags_clear(ip, XFS_ISTALE);
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XFS_STATS_INC(mp, xs_ig_found);
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return 0;
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out_error:
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spin_unlock(&ip->i_flags_lock);
|
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rcu_read_unlock();
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return error;
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}
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|
|
|
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static int
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xfs_iget_cache_miss(
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struct xfs_mount *mp,
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struct xfs_perag *pag,
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xfs_trans_t *tp,
|
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xfs_ino_t ino,
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struct xfs_inode **ipp,
|
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int flags,
|
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int lock_flags)
|
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{
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struct xfs_inode *ip;
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int error;
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xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino);
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int iflags;
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|
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ip = xfs_inode_alloc(mp, ino);
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if (!ip)
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return -ENOMEM;
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|
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error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, flags);
|
|
if (error)
|
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goto out_destroy;
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|
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/*
|
|
* For version 5 superblocks, if we are initialising a new inode and we
|
|
* are not utilising the XFS_MOUNT_IKEEP inode cluster mode, we can
|
|
* simply build the new inode core with a random generation number.
|
|
*
|
|
* For version 4 (and older) superblocks, log recovery is dependent on
|
|
* the di_flushiter field being initialised from the current on-disk
|
|
* value and hence we must also read the inode off disk even when
|
|
* initializing new inodes.
|
|
*/
|
|
if (xfs_sb_version_has_v3inode(&mp->m_sb) &&
|
|
(flags & XFS_IGET_CREATE) && !(mp->m_flags & XFS_MOUNT_IKEEP)) {
|
|
VFS_I(ip)->i_generation = prandom_u32();
|
|
} else {
|
|
struct xfs_dinode *dip;
|
|
struct xfs_buf *bp;
|
|
|
|
error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0);
|
|
if (error)
|
|
goto out_destroy;
|
|
|
|
error = xfs_inode_from_disk(ip, dip);
|
|
if (!error)
|
|
xfs_buf_set_ref(bp, XFS_INO_REF);
|
|
xfs_trans_brelse(tp, bp);
|
|
|
|
if (error)
|
|
goto out_destroy;
|
|
}
|
|
|
|
trace_xfs_iget_miss(ip);
|
|
|
|
/*
|
|
* Check the inode free state is valid. This also detects lookup
|
|
* racing with unlinks.
|
|
*/
|
|
error = xfs_iget_check_free_state(ip, flags);
|
|
if (error)
|
|
goto out_destroy;
|
|
|
|
/*
|
|
* Preload the radix tree so we can insert safely under the
|
|
* write spinlock. Note that we cannot sleep inside the preload
|
|
* region. Since we can be called from transaction context, don't
|
|
* recurse into the file system.
|
|
*/
|
|
if (radix_tree_preload(GFP_NOFS)) {
|
|
error = -EAGAIN;
|
|
goto out_destroy;
|
|
}
|
|
|
|
/*
|
|
* Because the inode hasn't been added to the radix-tree yet it can't
|
|
* be found by another thread, so we can do the non-sleeping lock here.
|
|
*/
|
|
if (lock_flags) {
|
|
if (!xfs_ilock_nowait(ip, lock_flags))
|
|
BUG();
|
|
}
|
|
|
|
/*
|
|
* These values must be set before inserting the inode into the radix
|
|
* tree as the moment it is inserted a concurrent lookup (allowed by the
|
|
* RCU locking mechanism) can find it and that lookup must see that this
|
|
* is an inode currently under construction (i.e. that XFS_INEW is set).
|
|
* The ip->i_flags_lock that protects the XFS_INEW flag forms the
|
|
* memory barrier that ensures this detection works correctly at lookup
|
|
* time.
|
|
*/
|
|
iflags = XFS_INEW;
|
|
if (flags & XFS_IGET_DONTCACHE)
|
|
d_mark_dontcache(VFS_I(ip));
|
|
ip->i_udquot = NULL;
|
|
ip->i_gdquot = NULL;
|
|
ip->i_pdquot = NULL;
|
|
xfs_iflags_set(ip, iflags);
|
|
|
|
/* insert the new inode */
|
|
spin_lock(&pag->pag_ici_lock);
|
|
error = radix_tree_insert(&pag->pag_ici_root, agino, ip);
|
|
if (unlikely(error)) {
|
|
WARN_ON(error != -EEXIST);
|
|
XFS_STATS_INC(mp, xs_ig_dup);
|
|
error = -EAGAIN;
|
|
goto out_preload_end;
|
|
}
|
|
spin_unlock(&pag->pag_ici_lock);
|
|
radix_tree_preload_end();
|
|
|
|
*ipp = ip;
|
|
return 0;
|
|
|
|
out_preload_end:
|
|
spin_unlock(&pag->pag_ici_lock);
|
|
radix_tree_preload_end();
|
|
if (lock_flags)
|
|
xfs_iunlock(ip, lock_flags);
|
|
out_destroy:
|
|
__destroy_inode(VFS_I(ip));
|
|
xfs_inode_free(ip);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Look up an inode by number in the given file system. The inode is looked up
|
|
* in the cache held in each AG. If the inode is found in the cache, initialise
|
|
* the vfs inode if necessary.
|
|
*
|
|
* If it is not in core, read it in from the file system's device, add it to the
|
|
* cache and initialise the vfs inode.
|
|
*
|
|
* The inode is locked according to the value of the lock_flags parameter.
|
|
* Inode lookup is only done during metadata operations and not as part of the
|
|
* data IO path. Hence we only allow locking of the XFS_ILOCK during lookup.
|
|
*/
|
|
int
|
|
xfs_iget(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
xfs_ino_t ino,
|
|
uint flags,
|
|
uint lock_flags,
|
|
struct xfs_inode **ipp)
|
|
{
|
|
struct xfs_inode *ip;
|
|
struct xfs_perag *pag;
|
|
xfs_agino_t agino;
|
|
int error;
|
|
|
|
ASSERT((lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) == 0);
|
|
|
|
/* reject inode numbers outside existing AGs */
|
|
if (!ino || XFS_INO_TO_AGNO(mp, ino) >= mp->m_sb.sb_agcount)
|
|
return -EINVAL;
|
|
|
|
XFS_STATS_INC(mp, xs_ig_attempts);
|
|
|
|
/* get the perag structure and ensure that it's inode capable */
|
|
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ino));
|
|
agino = XFS_INO_TO_AGINO(mp, ino);
|
|
|
|
again:
|
|
error = 0;
|
|
rcu_read_lock();
|
|
ip = radix_tree_lookup(&pag->pag_ici_root, agino);
|
|
|
|
if (ip) {
|
|
error = xfs_iget_cache_hit(pag, ip, ino, flags, lock_flags);
|
|
if (error)
|
|
goto out_error_or_again;
|
|
} else {
|
|
rcu_read_unlock();
|
|
if (flags & XFS_IGET_INCORE) {
|
|
error = -ENODATA;
|
|
goto out_error_or_again;
|
|
}
|
|
XFS_STATS_INC(mp, xs_ig_missed);
|
|
|
|
error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip,
|
|
flags, lock_flags);
|
|
if (error)
|
|
goto out_error_or_again;
|
|
}
|
|
xfs_perag_put(pag);
|
|
|
|
*ipp = ip;
|
|
|
|
/*
|
|
* If we have a real type for an on-disk inode, we can setup the inode
|
|
* now. If it's a new inode being created, xfs_ialloc will handle it.
|
|
*/
|
|
if (xfs_iflags_test(ip, XFS_INEW) && VFS_I(ip)->i_mode != 0)
|
|
xfs_setup_existing_inode(ip);
|
|
return 0;
|
|
|
|
out_error_or_again:
|
|
if (!(flags & XFS_IGET_INCORE) && error == -EAGAIN) {
|
|
delay(1);
|
|
goto again;
|
|
}
|
|
xfs_perag_put(pag);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* "Is this a cached inode that's also allocated?"
|
|
*
|
|
* Look up an inode by number in the given file system. If the inode is
|
|
* in cache and isn't in purgatory, return 1 if the inode is allocated
|
|
* and 0 if it is not. For all other cases (not in cache, being torn
|
|
* down, etc.), return a negative error code.
|
|
*
|
|
* The caller has to prevent inode allocation and freeing activity,
|
|
* presumably by locking the AGI buffer. This is to ensure that an
|
|
* inode cannot transition from allocated to freed until the caller is
|
|
* ready to allow that. If the inode is in an intermediate state (new,
|
|
* reclaimable, or being reclaimed), -EAGAIN will be returned; if the
|
|
* inode is not in the cache, -ENOENT will be returned. The caller must
|
|
* deal with these scenarios appropriately.
|
|
*
|
|
* This is a specialized use case for the online scrubber; if you're
|
|
* reading this, you probably want xfs_iget.
|
|
*/
|
|
int
|
|
xfs_icache_inode_is_allocated(
|
|
struct xfs_mount *mp,
|
|
struct xfs_trans *tp,
|
|
xfs_ino_t ino,
|
|
bool *inuse)
|
|
{
|
|
struct xfs_inode *ip;
|
|
int error;
|
|
|
|
error = xfs_iget(mp, tp, ino, XFS_IGET_INCORE, 0, &ip);
|
|
if (error)
|
|
return error;
|
|
|
|
*inuse = !!(VFS_I(ip)->i_mode);
|
|
xfs_irele(ip);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The inode lookup is done in batches to keep the amount of lock traffic and
|
|
* radix tree lookups to a minimum. The batch size is a trade off between
|
|
* lookup reduction and stack usage. This is in the reclaim path, so we can't
|
|
* be too greedy.
|
|
*/
|
|
#define XFS_LOOKUP_BATCH 32
|
|
|
|
/*
|
|
* Decide if the given @ip is eligible to be a part of the inode walk, and
|
|
* grab it if so. Returns true if it's ready to go or false if we should just
|
|
* ignore it.
|
|
*/
|
|
STATIC bool
|
|
xfs_inode_walk_ag_grab(
|
|
struct xfs_inode *ip,
|
|
int flags)
|
|
{
|
|
struct inode *inode = VFS_I(ip);
|
|
bool newinos = !!(flags & XFS_INODE_WALK_INEW_WAIT);
|
|
|
|
ASSERT(rcu_read_lock_held());
|
|
|
|
/* Check for stale RCU freed inode */
|
|
spin_lock(&ip->i_flags_lock);
|
|
if (!ip->i_ino)
|
|
goto out_unlock_noent;
|
|
|
|
/* avoid new or reclaimable inodes. Leave for reclaim code to flush */
|
|
if ((!newinos && __xfs_iflags_test(ip, XFS_INEW)) ||
|
|
__xfs_iflags_test(ip, XFS_IRECLAIMABLE | XFS_IRECLAIM))
|
|
goto out_unlock_noent;
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
/* nothing to sync during shutdown */
|
|
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
|
|
return false;
|
|
|
|
/* If we can't grab the inode, it must on it's way to reclaim. */
|
|
if (!igrab(inode))
|
|
return false;
|
|
|
|
/* inode is valid */
|
|
return true;
|
|
|
|
out_unlock_noent:
|
|
spin_unlock(&ip->i_flags_lock);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* For a given per-AG structure @pag, grab, @execute, and rele all incore
|
|
* inodes with the given radix tree @tag.
|
|
*/
|
|
STATIC int
|
|
xfs_inode_walk_ag(
|
|
struct xfs_perag *pag,
|
|
int iter_flags,
|
|
int (*execute)(struct xfs_inode *ip, void *args),
|
|
void *args,
|
|
int tag)
|
|
{
|
|
struct xfs_mount *mp = pag->pag_mount;
|
|
uint32_t first_index;
|
|
int last_error = 0;
|
|
int skipped;
|
|
bool done;
|
|
int nr_found;
|
|
|
|
restart:
|
|
done = false;
|
|
skipped = 0;
|
|
first_index = 0;
|
|
nr_found = 0;
|
|
do {
|
|
struct xfs_inode *batch[XFS_LOOKUP_BATCH];
|
|
int error = 0;
|
|
int i;
|
|
|
|
rcu_read_lock();
|
|
|
|
if (tag == XFS_ICI_NO_TAG)
|
|
nr_found = radix_tree_gang_lookup(&pag->pag_ici_root,
|
|
(void **)batch, first_index,
|
|
XFS_LOOKUP_BATCH);
|
|
else
|
|
nr_found = radix_tree_gang_lookup_tag(
|
|
&pag->pag_ici_root,
|
|
(void **) batch, first_index,
|
|
XFS_LOOKUP_BATCH, tag);
|
|
|
|
if (!nr_found) {
|
|
rcu_read_unlock();
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Grab the inodes before we drop the lock. if we found
|
|
* nothing, nr == 0 and the loop will be skipped.
|
|
*/
|
|
for (i = 0; i < nr_found; i++) {
|
|
struct xfs_inode *ip = batch[i];
|
|
|
|
if (done || !xfs_inode_walk_ag_grab(ip, iter_flags))
|
|
batch[i] = NULL;
|
|
|
|
/*
|
|
* Update the index for the next lookup. Catch
|
|
* overflows into the next AG range which can occur if
|
|
* we have inodes in the last block of the AG and we
|
|
* are currently pointing to the last inode.
|
|
*
|
|
* Because we may see inodes that are from the wrong AG
|
|
* due to RCU freeing and reallocation, only update the
|
|
* index if it lies in this AG. It was a race that lead
|
|
* us to see this inode, so another lookup from the
|
|
* same index will not find it again.
|
|
*/
|
|
if (XFS_INO_TO_AGNO(mp, ip->i_ino) != pag->pag_agno)
|
|
continue;
|
|
first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
|
|
if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
|
|
done = true;
|
|
}
|
|
|
|
/* unlock now we've grabbed the inodes. */
|
|
rcu_read_unlock();
|
|
|
|
for (i = 0; i < nr_found; i++) {
|
|
if (!batch[i])
|
|
continue;
|
|
if ((iter_flags & XFS_INODE_WALK_INEW_WAIT) &&
|
|
xfs_iflags_test(batch[i], XFS_INEW))
|
|
xfs_inew_wait(batch[i]);
|
|
error = execute(batch[i], args);
|
|
xfs_irele(batch[i]);
|
|
if (error == -EAGAIN) {
|
|
skipped++;
|
|
continue;
|
|
}
|
|
if (error && last_error != -EFSCORRUPTED)
|
|
last_error = error;
|
|
}
|
|
|
|
/* bail out if the filesystem is corrupted. */
|
|
if (error == -EFSCORRUPTED)
|
|
break;
|
|
|
|
cond_resched();
|
|
|
|
} while (nr_found && !done);
|
|
|
|
if (skipped) {
|
|
delay(1);
|
|
goto restart;
|
|
}
|
|
return last_error;
|
|
}
|
|
|
|
/* Fetch the next (possibly tagged) per-AG structure. */
|
|
static inline struct xfs_perag *
|
|
xfs_inode_walk_get_perag(
|
|
struct xfs_mount *mp,
|
|
xfs_agnumber_t agno,
|
|
int tag)
|
|
{
|
|
if (tag == XFS_ICI_NO_TAG)
|
|
return xfs_perag_get(mp, agno);
|
|
return xfs_perag_get_tag(mp, agno, tag);
|
|
}
|
|
|
|
/*
|
|
* Call the @execute function on all incore inodes matching the radix tree
|
|
* @tag.
|
|
*/
|
|
int
|
|
xfs_inode_walk(
|
|
struct xfs_mount *mp,
|
|
int iter_flags,
|
|
int (*execute)(struct xfs_inode *ip, void *args),
|
|
void *args,
|
|
int tag)
|
|
{
|
|
struct xfs_perag *pag;
|
|
int error = 0;
|
|
int last_error = 0;
|
|
xfs_agnumber_t ag;
|
|
|
|
ag = 0;
|
|
while ((pag = xfs_inode_walk_get_perag(mp, ag, tag))) {
|
|
ag = pag->pag_agno + 1;
|
|
error = xfs_inode_walk_ag(pag, iter_flags, execute, args, tag);
|
|
xfs_perag_put(pag);
|
|
if (error) {
|
|
last_error = error;
|
|
if (error == -EFSCORRUPTED)
|
|
break;
|
|
}
|
|
}
|
|
return last_error;
|
|
}
|
|
|
|
/*
|
|
* Grab the inode for reclaim exclusively.
|
|
*
|
|
* We have found this inode via a lookup under RCU, so the inode may have
|
|
* already been freed, or it may be in the process of being recycled by
|
|
* xfs_iget(). In both cases, the inode will have XFS_IRECLAIM set. If the inode
|
|
* has been fully recycled by the time we get the i_flags_lock, XFS_IRECLAIMABLE
|
|
* will not be set. Hence we need to check for both these flag conditions to
|
|
* avoid inodes that are no longer reclaim candidates.
|
|
*
|
|
* Note: checking for other state flags here, under the i_flags_lock or not, is
|
|
* racy and should be avoided. Those races should be resolved only after we have
|
|
* ensured that we are able to reclaim this inode and the world can see that we
|
|
* are going to reclaim it.
|
|
*
|
|
* Return true if we grabbed it, false otherwise.
|
|
*/
|
|
static bool
|
|
xfs_reclaim_inode_grab(
|
|
struct xfs_inode *ip)
|
|
{
|
|
ASSERT(rcu_read_lock_held());
|
|
|
|
spin_lock(&ip->i_flags_lock);
|
|
if (!__xfs_iflags_test(ip, XFS_IRECLAIMABLE) ||
|
|
__xfs_iflags_test(ip, XFS_IRECLAIM)) {
|
|
/* not a reclaim candidate. */
|
|
spin_unlock(&ip->i_flags_lock);
|
|
return false;
|
|
}
|
|
__xfs_iflags_set(ip, XFS_IRECLAIM);
|
|
spin_unlock(&ip->i_flags_lock);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Inode reclaim is non-blocking, so the default action if progress cannot be
|
|
* made is to "requeue" the inode for reclaim by unlocking it and clearing the
|
|
* XFS_IRECLAIM flag. If we are in a shutdown state, we don't care about
|
|
* blocking anymore and hence we can wait for the inode to be able to reclaim
|
|
* it.
|
|
*
|
|
* We do no IO here - if callers require inodes to be cleaned they must push the
|
|
* AIL first to trigger writeback of dirty inodes. This enables writeback to be
|
|
* done in the background in a non-blocking manner, and enables memory reclaim
|
|
* to make progress without blocking.
|
|
*/
|
|
static void
|
|
xfs_reclaim_inode(
|
|
struct xfs_inode *ip,
|
|
struct xfs_perag *pag)
|
|
{
|
|
xfs_ino_t ino = ip->i_ino; /* for radix_tree_delete */
|
|
|
|
if (!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL))
|
|
goto out;
|
|
if (xfs_iflags_test_and_set(ip, XFS_IFLUSHING))
|
|
goto out_iunlock;
|
|
|
|
if (XFS_FORCED_SHUTDOWN(ip->i_mount)) {
|
|
xfs_iunpin_wait(ip);
|
|
xfs_iflush_abort(ip);
|
|
goto reclaim;
|
|
}
|
|
if (xfs_ipincount(ip))
|
|
goto out_clear_flush;
|
|
if (!xfs_inode_clean(ip))
|
|
goto out_clear_flush;
|
|
|
|
xfs_iflags_clear(ip, XFS_IFLUSHING);
|
|
reclaim:
|
|
|
|
/*
|
|
* Because we use RCU freeing we need to ensure the inode always appears
|
|
* to be reclaimed with an invalid inode number when in the free state.
|
|
* We do this as early as possible under the ILOCK so that
|
|
* xfs_iflush_cluster() and xfs_ifree_cluster() can be guaranteed to
|
|
* detect races with us here. By doing this, we guarantee that once
|
|
* xfs_iflush_cluster() or xfs_ifree_cluster() has locked XFS_ILOCK that
|
|
* it will see either a valid inode that will serialise correctly, or it
|
|
* will see an invalid inode that it can skip.
|
|
*/
|
|
spin_lock(&ip->i_flags_lock);
|
|
ip->i_flags = XFS_IRECLAIM;
|
|
ip->i_ino = 0;
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
|
|
XFS_STATS_INC(ip->i_mount, xs_ig_reclaims);
|
|
/*
|
|
* Remove the inode from the per-AG radix tree.
|
|
*
|
|
* Because radix_tree_delete won't complain even if the item was never
|
|
* added to the tree assert that it's been there before to catch
|
|
* problems with the inode life time early on.
|
|
*/
|
|
spin_lock(&pag->pag_ici_lock);
|
|
if (!radix_tree_delete(&pag->pag_ici_root,
|
|
XFS_INO_TO_AGINO(ip->i_mount, ino)))
|
|
ASSERT(0);
|
|
xfs_perag_clear_reclaim_tag(pag);
|
|
spin_unlock(&pag->pag_ici_lock);
|
|
|
|
/*
|
|
* Here we do an (almost) spurious inode lock in order to coordinate
|
|
* with inode cache radix tree lookups. This is because the lookup
|
|
* can reference the inodes in the cache without taking references.
|
|
*
|
|
* We make that OK here by ensuring that we wait until the inode is
|
|
* unlocked after the lookup before we go ahead and free it.
|
|
*/
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_qm_dqdetach(ip);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
ASSERT(xfs_inode_clean(ip));
|
|
|
|
__xfs_inode_free(ip);
|
|
return;
|
|
|
|
out_clear_flush:
|
|
xfs_iflags_clear(ip, XFS_IFLUSHING);
|
|
out_iunlock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
out:
|
|
xfs_iflags_clear(ip, XFS_IRECLAIM);
|
|
}
|
|
|
|
/*
|
|
* Walk the AGs and reclaim the inodes in them. Even if the filesystem is
|
|
* corrupted, we still want to try to reclaim all the inodes. If we don't,
|
|
* then a shut down during filesystem unmount reclaim walk leak all the
|
|
* unreclaimed inodes.
|
|
*
|
|
* Returns non-zero if any AGs or inodes were skipped in the reclaim pass
|
|
* so that callers that want to block until all dirty inodes are written back
|
|
* and reclaimed can sanely loop.
|
|
*/
|
|
static void
|
|
xfs_reclaim_inodes_ag(
|
|
struct xfs_mount *mp,
|
|
int *nr_to_scan)
|
|
{
|
|
struct xfs_perag *pag;
|
|
xfs_agnumber_t ag = 0;
|
|
|
|
while ((pag = xfs_perag_get_tag(mp, ag, XFS_ICI_RECLAIM_TAG))) {
|
|
unsigned long first_index = 0;
|
|
int done = 0;
|
|
int nr_found = 0;
|
|
|
|
ag = pag->pag_agno + 1;
|
|
|
|
first_index = READ_ONCE(pag->pag_ici_reclaim_cursor);
|
|
do {
|
|
struct xfs_inode *batch[XFS_LOOKUP_BATCH];
|
|
int i;
|
|
|
|
rcu_read_lock();
|
|
nr_found = radix_tree_gang_lookup_tag(
|
|
&pag->pag_ici_root,
|
|
(void **)batch, first_index,
|
|
XFS_LOOKUP_BATCH,
|
|
XFS_ICI_RECLAIM_TAG);
|
|
if (!nr_found) {
|
|
done = 1;
|
|
rcu_read_unlock();
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Grab the inodes before we drop the lock. if we found
|
|
* nothing, nr == 0 and the loop will be skipped.
|
|
*/
|
|
for (i = 0; i < nr_found; i++) {
|
|
struct xfs_inode *ip = batch[i];
|
|
|
|
if (done || !xfs_reclaim_inode_grab(ip))
|
|
batch[i] = NULL;
|
|
|
|
/*
|
|
* Update the index for the next lookup. Catch
|
|
* overflows into the next AG range which can
|
|
* occur if we have inodes in the last block of
|
|
* the AG and we are currently pointing to the
|
|
* last inode.
|
|
*
|
|
* Because we may see inodes that are from the
|
|
* wrong AG due to RCU freeing and
|
|
* reallocation, only update the index if it
|
|
* lies in this AG. It was a race that lead us
|
|
* to see this inode, so another lookup from
|
|
* the same index will not find it again.
|
|
*/
|
|
if (XFS_INO_TO_AGNO(mp, ip->i_ino) !=
|
|
pag->pag_agno)
|
|
continue;
|
|
first_index = XFS_INO_TO_AGINO(mp, ip->i_ino + 1);
|
|
if (first_index < XFS_INO_TO_AGINO(mp, ip->i_ino))
|
|
done = 1;
|
|
}
|
|
|
|
/* unlock now we've grabbed the inodes. */
|
|
rcu_read_unlock();
|
|
|
|
for (i = 0; i < nr_found; i++) {
|
|
if (batch[i])
|
|
xfs_reclaim_inode(batch[i], pag);
|
|
}
|
|
|
|
*nr_to_scan -= XFS_LOOKUP_BATCH;
|
|
cond_resched();
|
|
} while (nr_found && !done && *nr_to_scan > 0);
|
|
|
|
if (done)
|
|
first_index = 0;
|
|
WRITE_ONCE(pag->pag_ici_reclaim_cursor, first_index);
|
|
xfs_perag_put(pag);
|
|
}
|
|
}
|
|
|
|
void
|
|
xfs_reclaim_inodes(
|
|
struct xfs_mount *mp)
|
|
{
|
|
int nr_to_scan = INT_MAX;
|
|
|
|
while (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_RECLAIM_TAG)) {
|
|
xfs_ail_push_all_sync(mp->m_ail);
|
|
xfs_reclaim_inodes_ag(mp, &nr_to_scan);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* The shrinker infrastructure determines how many inodes we should scan for
|
|
* reclaim. We want as many clean inodes ready to reclaim as possible, so we
|
|
* push the AIL here. We also want to proactively free up memory if we can to
|
|
* minimise the amount of work memory reclaim has to do so we kick the
|
|
* background reclaim if it isn't already scheduled.
|
|
*/
|
|
long
|
|
xfs_reclaim_inodes_nr(
|
|
struct xfs_mount *mp,
|
|
int nr_to_scan)
|
|
{
|
|
/* kick background reclaimer and push the AIL */
|
|
xfs_reclaim_work_queue(mp);
|
|
xfs_ail_push_all(mp->m_ail);
|
|
|
|
xfs_reclaim_inodes_ag(mp, &nr_to_scan);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the number of reclaimable inodes in the filesystem for
|
|
* the shrinker to determine how much to reclaim.
|
|
*/
|
|
int
|
|
xfs_reclaim_inodes_count(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_perag *pag;
|
|
xfs_agnumber_t ag = 0;
|
|
int reclaimable = 0;
|
|
|
|
while ((pag = xfs_perag_get_tag(mp, ag, XFS_ICI_RECLAIM_TAG))) {
|
|
ag = pag->pag_agno + 1;
|
|
reclaimable += pag->pag_ici_reclaimable;
|
|
xfs_perag_put(pag);
|
|
}
|
|
return reclaimable;
|
|
}
|
|
|
|
STATIC bool
|
|
xfs_inode_match_id(
|
|
struct xfs_inode *ip,
|
|
struct xfs_eofblocks *eofb)
|
|
{
|
|
if ((eofb->eof_flags & XFS_EOF_FLAGS_UID) &&
|
|
!uid_eq(VFS_I(ip)->i_uid, eofb->eof_uid))
|
|
return false;
|
|
|
|
if ((eofb->eof_flags & XFS_EOF_FLAGS_GID) &&
|
|
!gid_eq(VFS_I(ip)->i_gid, eofb->eof_gid))
|
|
return false;
|
|
|
|
if ((eofb->eof_flags & XFS_EOF_FLAGS_PRID) &&
|
|
ip->i_d.di_projid != eofb->eof_prid)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* A union-based inode filtering algorithm. Process the inode if any of the
|
|
* criteria match. This is for global/internal scans only.
|
|
*/
|
|
STATIC bool
|
|
xfs_inode_match_id_union(
|
|
struct xfs_inode *ip,
|
|
struct xfs_eofblocks *eofb)
|
|
{
|
|
if ((eofb->eof_flags & XFS_EOF_FLAGS_UID) &&
|
|
uid_eq(VFS_I(ip)->i_uid, eofb->eof_uid))
|
|
return true;
|
|
|
|
if ((eofb->eof_flags & XFS_EOF_FLAGS_GID) &&
|
|
gid_eq(VFS_I(ip)->i_gid, eofb->eof_gid))
|
|
return true;
|
|
|
|
if ((eofb->eof_flags & XFS_EOF_FLAGS_PRID) &&
|
|
ip->i_d.di_projid == eofb->eof_prid)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Is this inode @ip eligible for eof/cow block reclamation, given some
|
|
* filtering parameters @eofb? The inode is eligible if @eofb is null or
|
|
* if the predicate functions match.
|
|
*/
|
|
static bool
|
|
xfs_inode_matches_eofb(
|
|
struct xfs_inode *ip,
|
|
struct xfs_eofblocks *eofb)
|
|
{
|
|
bool match;
|
|
|
|
if (!eofb)
|
|
return true;
|
|
|
|
if (eofb->eof_flags & XFS_EOF_FLAGS_UNION)
|
|
match = xfs_inode_match_id_union(ip, eofb);
|
|
else
|
|
match = xfs_inode_match_id(ip, eofb);
|
|
if (!match)
|
|
return false;
|
|
|
|
/* skip the inode if the file size is too small */
|
|
if ((eofb->eof_flags & XFS_EOF_FLAGS_MINFILESIZE) &&
|
|
XFS_ISIZE(ip) < eofb->eof_min_file_size)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* This is a fast pass over the inode cache to try to get reclaim moving on as
|
|
* many inodes as possible in a short period of time. It kicks itself every few
|
|
* seconds, as well as being kicked by the inode cache shrinker when memory
|
|
* goes low.
|
|
*/
|
|
void
|
|
xfs_reclaim_worker(
|
|
struct work_struct *work)
|
|
{
|
|
struct xfs_mount *mp = container_of(to_delayed_work(work),
|
|
struct xfs_mount, m_reclaim_work);
|
|
int nr_to_scan = INT_MAX;
|
|
|
|
xfs_reclaim_inodes_ag(mp, &nr_to_scan);
|
|
xfs_reclaim_work_queue(mp);
|
|
}
|
|
|
|
STATIC int
|
|
xfs_inode_free_eofblocks(
|
|
struct xfs_inode *ip,
|
|
void *args,
|
|
unsigned int *lockflags)
|
|
{
|
|
struct xfs_eofblocks *eofb = args;
|
|
bool wait;
|
|
|
|
wait = eofb && (eofb->eof_flags & XFS_EOF_FLAGS_SYNC);
|
|
|
|
if (!xfs_iflags_test(ip, XFS_IEOFBLOCKS))
|
|
return 0;
|
|
|
|
if (!xfs_can_free_eofblocks(ip, false)) {
|
|
/* inode could be preallocated or append-only */
|
|
trace_xfs_inode_free_eofblocks_invalid(ip);
|
|
xfs_inode_clear_eofblocks_tag(ip);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If the mapping is dirty the operation can block and wait for some
|
|
* time. Unless we are waiting, skip it.
|
|
*/
|
|
if (!wait && mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY))
|
|
return 0;
|
|
|
|
if (!xfs_inode_matches_eofb(ip, eofb))
|
|
return 0;
|
|
|
|
/*
|
|
* If the caller is waiting, return -EAGAIN to keep the background
|
|
* scanner moving and revisit the inode in a subsequent pass.
|
|
*/
|
|
if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
|
|
if (wait)
|
|
return -EAGAIN;
|
|
return 0;
|
|
}
|
|
*lockflags |= XFS_IOLOCK_EXCL;
|
|
|
|
return xfs_free_eofblocks(ip);
|
|
}
|
|
|
|
/*
|
|
* Background scanning to trim preallocated space. This is queued based on the
|
|
* 'speculative_prealloc_lifetime' tunable (5m by default).
|
|
*/
|
|
static inline void
|
|
xfs_blockgc_queue(
|
|
struct xfs_perag *pag)
|
|
{
|
|
rcu_read_lock();
|
|
if (radix_tree_tagged(&pag->pag_ici_root, XFS_ICI_BLOCKGC_TAG))
|
|
queue_delayed_work(pag->pag_mount->m_blockgc_workqueue,
|
|
&pag->pag_blockgc_work,
|
|
msecs_to_jiffies(xfs_blockgc_secs * 1000));
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void
|
|
xfs_blockgc_set_iflag(
|
|
struct xfs_inode *ip,
|
|
unsigned long iflag)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_perag *pag;
|
|
int tagged;
|
|
|
|
ASSERT((iflag & ~(XFS_IEOFBLOCKS | XFS_ICOWBLOCKS)) == 0);
|
|
|
|
/*
|
|
* Don't bother locking the AG and looking up in the radix trees
|
|
* if we already know that we have the tag set.
|
|
*/
|
|
if (ip->i_flags & iflag)
|
|
return;
|
|
spin_lock(&ip->i_flags_lock);
|
|
ip->i_flags |= iflag;
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
|
|
spin_lock(&pag->pag_ici_lock);
|
|
|
|
tagged = radix_tree_tagged(&pag->pag_ici_root, XFS_ICI_BLOCKGC_TAG);
|
|
radix_tree_tag_set(&pag->pag_ici_root,
|
|
XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
|
|
XFS_ICI_BLOCKGC_TAG);
|
|
if (!tagged) {
|
|
/* propagate the blockgc tag up into the perag radix tree */
|
|
spin_lock(&ip->i_mount->m_perag_lock);
|
|
radix_tree_tag_set(&ip->i_mount->m_perag_tree,
|
|
XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
|
|
XFS_ICI_BLOCKGC_TAG);
|
|
spin_unlock(&ip->i_mount->m_perag_lock);
|
|
|
|
/* kick off background trimming */
|
|
xfs_blockgc_queue(pag);
|
|
|
|
trace_xfs_perag_set_blockgc(ip->i_mount, pag->pag_agno, -1,
|
|
_RET_IP_);
|
|
}
|
|
|
|
spin_unlock(&pag->pag_ici_lock);
|
|
xfs_perag_put(pag);
|
|
}
|
|
|
|
void
|
|
xfs_inode_set_eofblocks_tag(
|
|
xfs_inode_t *ip)
|
|
{
|
|
trace_xfs_inode_set_eofblocks_tag(ip);
|
|
return xfs_blockgc_set_iflag(ip, XFS_IEOFBLOCKS);
|
|
}
|
|
|
|
static void
|
|
xfs_blockgc_clear_iflag(
|
|
struct xfs_inode *ip,
|
|
unsigned long iflag)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_perag *pag;
|
|
bool clear_tag;
|
|
|
|
ASSERT((iflag & ~(XFS_IEOFBLOCKS | XFS_ICOWBLOCKS)) == 0);
|
|
|
|
spin_lock(&ip->i_flags_lock);
|
|
ip->i_flags &= ~iflag;
|
|
clear_tag = (ip->i_flags & (XFS_IEOFBLOCKS | XFS_ICOWBLOCKS)) == 0;
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
if (!clear_tag)
|
|
return;
|
|
|
|
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
|
|
spin_lock(&pag->pag_ici_lock);
|
|
|
|
radix_tree_tag_clear(&pag->pag_ici_root,
|
|
XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
|
|
XFS_ICI_BLOCKGC_TAG);
|
|
if (!radix_tree_tagged(&pag->pag_ici_root, XFS_ICI_BLOCKGC_TAG)) {
|
|
/* clear the blockgc tag from the perag radix tree */
|
|
spin_lock(&ip->i_mount->m_perag_lock);
|
|
radix_tree_tag_clear(&ip->i_mount->m_perag_tree,
|
|
XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
|
|
XFS_ICI_BLOCKGC_TAG);
|
|
spin_unlock(&ip->i_mount->m_perag_lock);
|
|
trace_xfs_perag_clear_blockgc(ip->i_mount, pag->pag_agno, -1,
|
|
_RET_IP_);
|
|
}
|
|
|
|
spin_unlock(&pag->pag_ici_lock);
|
|
xfs_perag_put(pag);
|
|
}
|
|
|
|
void
|
|
xfs_inode_clear_eofblocks_tag(
|
|
xfs_inode_t *ip)
|
|
{
|
|
trace_xfs_inode_clear_eofblocks_tag(ip);
|
|
return xfs_blockgc_clear_iflag(ip, XFS_IEOFBLOCKS);
|
|
}
|
|
|
|
/*
|
|
* Set ourselves up to free CoW blocks from this file. If it's already clean
|
|
* then we can bail out quickly, but otherwise we must back off if the file
|
|
* is undergoing some kind of write.
|
|
*/
|
|
static bool
|
|
xfs_prep_free_cowblocks(
|
|
struct xfs_inode *ip)
|
|
{
|
|
/*
|
|
* Just clear the tag if we have an empty cow fork or none at all. It's
|
|
* possible the inode was fully unshared since it was originally tagged.
|
|
*/
|
|
if (!xfs_inode_has_cow_data(ip)) {
|
|
trace_xfs_inode_free_cowblocks_invalid(ip);
|
|
xfs_inode_clear_cowblocks_tag(ip);
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* If the mapping is dirty or under writeback we cannot touch the
|
|
* CoW fork. Leave it alone if we're in the midst of a directio.
|
|
*/
|
|
if ((VFS_I(ip)->i_state & I_DIRTY_PAGES) ||
|
|
mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY) ||
|
|
mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
|
|
atomic_read(&VFS_I(ip)->i_dio_count))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Automatic CoW Reservation Freeing
|
|
*
|
|
* These functions automatically garbage collect leftover CoW reservations
|
|
* that were made on behalf of a cowextsize hint when we start to run out
|
|
* of quota or when the reservations sit around for too long. If the file
|
|
* has dirty pages or is undergoing writeback, its CoW reservations will
|
|
* be retained.
|
|
*
|
|
* The actual garbage collection piggybacks off the same code that runs
|
|
* the speculative EOF preallocation garbage collector.
|
|
*/
|
|
STATIC int
|
|
xfs_inode_free_cowblocks(
|
|
struct xfs_inode *ip,
|
|
void *args,
|
|
unsigned int *lockflags)
|
|
{
|
|
struct xfs_eofblocks *eofb = args;
|
|
bool wait;
|
|
int ret = 0;
|
|
|
|
wait = eofb && (eofb->eof_flags & XFS_EOF_FLAGS_SYNC);
|
|
|
|
if (!xfs_iflags_test(ip, XFS_ICOWBLOCKS))
|
|
return 0;
|
|
|
|
if (!xfs_prep_free_cowblocks(ip))
|
|
return 0;
|
|
|
|
if (!xfs_inode_matches_eofb(ip, eofb))
|
|
return 0;
|
|
|
|
/*
|
|
* If the caller is waiting, return -EAGAIN to keep the background
|
|
* scanner moving and revisit the inode in a subsequent pass.
|
|
*/
|
|
if (!(*lockflags & XFS_IOLOCK_EXCL) &&
|
|
!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
|
|
if (wait)
|
|
return -EAGAIN;
|
|
return 0;
|
|
}
|
|
*lockflags |= XFS_IOLOCK_EXCL;
|
|
|
|
if (!xfs_ilock_nowait(ip, XFS_MMAPLOCK_EXCL)) {
|
|
if (wait)
|
|
return -EAGAIN;
|
|
return 0;
|
|
}
|
|
*lockflags |= XFS_MMAPLOCK_EXCL;
|
|
|
|
/*
|
|
* Check again, nobody else should be able to dirty blocks or change
|
|
* the reflink iflag now that we have the first two locks held.
|
|
*/
|
|
if (xfs_prep_free_cowblocks(ip))
|
|
ret = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF, false);
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
xfs_inode_set_cowblocks_tag(
|
|
xfs_inode_t *ip)
|
|
{
|
|
trace_xfs_inode_set_cowblocks_tag(ip);
|
|
return xfs_blockgc_set_iflag(ip, XFS_ICOWBLOCKS);
|
|
}
|
|
|
|
void
|
|
xfs_inode_clear_cowblocks_tag(
|
|
xfs_inode_t *ip)
|
|
{
|
|
trace_xfs_inode_clear_cowblocks_tag(ip);
|
|
return xfs_blockgc_clear_iflag(ip, XFS_ICOWBLOCKS);
|
|
}
|
|
|
|
#define for_each_perag_tag(mp, next_agno, pag, tag) \
|
|
for ((next_agno) = 0, (pag) = xfs_perag_get_tag((mp), 0, (tag)); \
|
|
(pag) != NULL; \
|
|
(next_agno) = (pag)->pag_agno + 1, \
|
|
xfs_perag_put(pag), \
|
|
(pag) = xfs_perag_get_tag((mp), (next_agno), (tag)))
|
|
|
|
|
|
/* Disable post-EOF and CoW block auto-reclamation. */
|
|
void
|
|
xfs_blockgc_stop(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_perag *pag;
|
|
xfs_agnumber_t agno;
|
|
|
|
for_each_perag_tag(mp, agno, pag, XFS_ICI_BLOCKGC_TAG)
|
|
cancel_delayed_work_sync(&pag->pag_blockgc_work);
|
|
}
|
|
|
|
/* Enable post-EOF and CoW block auto-reclamation. */
|
|
void
|
|
xfs_blockgc_start(
|
|
struct xfs_mount *mp)
|
|
{
|
|
struct xfs_perag *pag;
|
|
xfs_agnumber_t agno;
|
|
|
|
for_each_perag_tag(mp, agno, pag, XFS_ICI_BLOCKGC_TAG)
|
|
xfs_blockgc_queue(pag);
|
|
}
|
|
|
|
/* Scan one incore inode for block preallocations that we can remove. */
|
|
static int
|
|
xfs_blockgc_scan_inode(
|
|
struct xfs_inode *ip,
|
|
void *args)
|
|
{
|
|
unsigned int lockflags = 0;
|
|
int error;
|
|
|
|
error = xfs_inode_free_eofblocks(ip, args, &lockflags);
|
|
if (error)
|
|
goto unlock;
|
|
|
|
error = xfs_inode_free_cowblocks(ip, args, &lockflags);
|
|
unlock:
|
|
if (lockflags)
|
|
xfs_iunlock(ip, lockflags);
|
|
return error;
|
|
}
|
|
|
|
/* Background worker that trims preallocated space. */
|
|
void
|
|
xfs_blockgc_worker(
|
|
struct work_struct *work)
|
|
{
|
|
struct xfs_perag *pag = container_of(to_delayed_work(work),
|
|
struct xfs_perag, pag_blockgc_work);
|
|
struct xfs_mount *mp = pag->pag_mount;
|
|
int error;
|
|
|
|
if (!sb_start_write_trylock(mp->m_super))
|
|
return;
|
|
error = xfs_inode_walk_ag(pag, 0, xfs_blockgc_scan_inode, NULL,
|
|
XFS_ICI_BLOCKGC_TAG);
|
|
if (error)
|
|
xfs_info(mp, "AG %u preallocation gc worker failed, err=%d",
|
|
pag->pag_agno, error);
|
|
sb_end_write(mp->m_super);
|
|
xfs_blockgc_queue(pag);
|
|
}
|
|
|
|
/*
|
|
* Try to free space in the filesystem by purging eofblocks and cowblocks.
|
|
*/
|
|
int
|
|
xfs_blockgc_free_space(
|
|
struct xfs_mount *mp,
|
|
struct xfs_eofblocks *eofb)
|
|
{
|
|
trace_xfs_blockgc_free_space(mp, eofb, _RET_IP_);
|
|
|
|
return xfs_inode_walk(mp, 0, xfs_blockgc_scan_inode, eofb,
|
|
XFS_ICI_BLOCKGC_TAG);
|
|
}
|
|
|
|
/*
|
|
* Run cow/eofblocks scans on the supplied dquots. We don't know exactly which
|
|
* quota caused an allocation failure, so we make a best effort by including
|
|
* each quota under low free space conditions (less than 1% free space) in the
|
|
* scan.
|
|
*
|
|
* Callers must not hold any inode's ILOCK. If requesting a synchronous scan
|
|
* (XFS_EOF_FLAGS_SYNC), the caller also must not hold any inode's IOLOCK or
|
|
* MMAPLOCK.
|
|
*/
|
|
int
|
|
xfs_blockgc_free_dquots(
|
|
struct xfs_mount *mp,
|
|
struct xfs_dquot *udqp,
|
|
struct xfs_dquot *gdqp,
|
|
struct xfs_dquot *pdqp,
|
|
unsigned int eof_flags)
|
|
{
|
|
struct xfs_eofblocks eofb = {0};
|
|
bool do_work = false;
|
|
|
|
if (!udqp && !gdqp && !pdqp)
|
|
return 0;
|
|
|
|
/*
|
|
* Run a scan to free blocks using the union filter to cover all
|
|
* applicable quotas in a single scan.
|
|
*/
|
|
eofb.eof_flags = XFS_EOF_FLAGS_UNION | eof_flags;
|
|
|
|
if (XFS_IS_UQUOTA_ENFORCED(mp) && udqp && xfs_dquot_lowsp(udqp)) {
|
|
eofb.eof_uid = make_kuid(mp->m_super->s_user_ns, udqp->q_id);
|
|
eofb.eof_flags |= XFS_EOF_FLAGS_UID;
|
|
do_work = true;
|
|
}
|
|
|
|
if (XFS_IS_UQUOTA_ENFORCED(mp) && gdqp && xfs_dquot_lowsp(gdqp)) {
|
|
eofb.eof_gid = make_kgid(mp->m_super->s_user_ns, gdqp->q_id);
|
|
eofb.eof_flags |= XFS_EOF_FLAGS_GID;
|
|
do_work = true;
|
|
}
|
|
|
|
if (XFS_IS_PQUOTA_ENFORCED(mp) && pdqp && xfs_dquot_lowsp(pdqp)) {
|
|
eofb.eof_prid = pdqp->q_id;
|
|
eofb.eof_flags |= XFS_EOF_FLAGS_PRID;
|
|
do_work = true;
|
|
}
|
|
|
|
if (!do_work)
|
|
return 0;
|
|
|
|
return xfs_blockgc_free_space(mp, &eofb);
|
|
}
|
|
|
|
/* Run cow/eofblocks scans on the quotas attached to the inode. */
|
|
int
|
|
xfs_blockgc_free_quota(
|
|
struct xfs_inode *ip,
|
|
unsigned int eof_flags)
|
|
{
|
|
return xfs_blockgc_free_dquots(ip->i_mount,
|
|
xfs_inode_dquot(ip, XFS_DQTYPE_USER),
|
|
xfs_inode_dquot(ip, XFS_DQTYPE_GROUP),
|
|
xfs_inode_dquot(ip, XFS_DQTYPE_PROJ), eof_flags);
|
|
}
|