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62334fab47
Directly track which CPUs have contributed to the inodegc percpu lists
instead of trusting the cpu online mask. This eliminates a theoretical
problem where the inodegc flush functions might fail to flush a CPU's
inodes if that CPU happened to be dying at exactly the same time. Most
likely nobody's noticed this because the CPU dead hook moves the percpu
inodegc list to another CPU and schedules that worker immediately. But
it's quite possible that this is a subtle race leading to UAF if the
inodegc flush were part of an unmount.
Further benefits: This reduces the overhead of the inodegc flush code
slightly by allowing us to ignore CPUs that have empty lists. Better
yet, it reduces our dependence on the cpu online masks, which have been
the cause of confusion and drama lately.
Fixes: ab23a77687 ("xfs: per-cpu deferred inode inactivation queues")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
84 lines
2.8 KiB
C
84 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*/
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#ifndef XFS_SYNC_H
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#define XFS_SYNC_H 1
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struct xfs_mount;
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struct xfs_perag;
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struct xfs_icwalk {
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__u32 icw_flags;
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kuid_t icw_uid;
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kgid_t icw_gid;
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prid_t icw_prid;
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__u64 icw_min_file_size;
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long icw_scan_limit;
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};
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/* Flags that reflect xfs_fs_eofblocks functionality. */
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#define XFS_ICWALK_FLAG_SYNC (1U << 0) /* sync/wait mode scan */
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#define XFS_ICWALK_FLAG_UID (1U << 1) /* filter by uid */
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#define XFS_ICWALK_FLAG_GID (1U << 2) /* filter by gid */
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#define XFS_ICWALK_FLAG_PRID (1U << 3) /* filter by project id */
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#define XFS_ICWALK_FLAG_MINFILESIZE (1U << 4) /* filter by min file size */
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#define XFS_ICWALK_FLAGS_VALID (XFS_ICWALK_FLAG_SYNC | \
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XFS_ICWALK_FLAG_UID | \
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XFS_ICWALK_FLAG_GID | \
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XFS_ICWALK_FLAG_PRID | \
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XFS_ICWALK_FLAG_MINFILESIZE)
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/*
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* Flags for xfs_iget()
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*/
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#define XFS_IGET_CREATE (1U << 0)
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#define XFS_IGET_UNTRUSTED (1U << 1)
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#define XFS_IGET_DONTCACHE (1U << 2)
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/* don't read from disk or reinit */
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#define XFS_IGET_INCORE (1U << 3)
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/* Return -EAGAIN immediately if the inode is unavailable. */
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#define XFS_IGET_NORETRY (1U << 4)
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int xfs_iget(struct xfs_mount *mp, struct xfs_trans *tp, xfs_ino_t ino,
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uint flags, uint lock_flags, xfs_inode_t **ipp);
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/* recovery needs direct inode allocation capability */
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struct xfs_inode * xfs_inode_alloc(struct xfs_mount *mp, xfs_ino_t ino);
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void xfs_inode_free(struct xfs_inode *ip);
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void xfs_reclaim_worker(struct work_struct *work);
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void xfs_reclaim_inodes(struct xfs_mount *mp);
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long xfs_reclaim_inodes_count(struct xfs_mount *mp);
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long xfs_reclaim_inodes_nr(struct xfs_mount *mp, unsigned long nr_to_scan);
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void xfs_inode_mark_reclaimable(struct xfs_inode *ip);
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int xfs_blockgc_free_dquots(struct xfs_mount *mp, struct xfs_dquot *udqp,
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struct xfs_dquot *gdqp, struct xfs_dquot *pdqp,
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unsigned int iwalk_flags);
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int xfs_blockgc_free_quota(struct xfs_inode *ip, unsigned int iwalk_flags);
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int xfs_blockgc_free_space(struct xfs_mount *mp, struct xfs_icwalk *icm);
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int xfs_blockgc_flush_all(struct xfs_mount *mp);
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void xfs_inode_set_eofblocks_tag(struct xfs_inode *ip);
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void xfs_inode_clear_eofblocks_tag(struct xfs_inode *ip);
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void xfs_inode_set_cowblocks_tag(struct xfs_inode *ip);
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void xfs_inode_clear_cowblocks_tag(struct xfs_inode *ip);
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void xfs_blockgc_worker(struct work_struct *work);
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void xfs_blockgc_stop(struct xfs_mount *mp);
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void xfs_blockgc_start(struct xfs_mount *mp);
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void xfs_inodegc_worker(struct work_struct *work);
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void xfs_inodegc_push(struct xfs_mount *mp);
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int xfs_inodegc_flush(struct xfs_mount *mp);
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void xfs_inodegc_stop(struct xfs_mount *mp);
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void xfs_inodegc_start(struct xfs_mount *mp);
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int xfs_inodegc_register_shrinker(struct xfs_mount *mp);
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#endif
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