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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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fe4f7940d2
The kernel threads are currently stopped and destroyed synchronously by gfs2_make_fs_ro() and gfs2_put_super(), and asynchronously by signal_our_withdraw(), with no synchronization, so the synchronous and asynchronous contexts can race with each other. First, when creating the kernel threads, take an extra task struct reference so that the task struct won't go away immediately when they terminate. This allows those kthreads to terminate immediately when they're done rather than hanging around as zombies until they are reaped by kthread_stop(). When kthread_stop() is called on a terminated kthread, it will return immediately. Second, in signal_our_withdraw(), once the SDF_JOURNAL_LIVE flag has been cleared, wake up the logd and quotad wait queues instead of stopping the logd and quotad kthreads. The kthreads are then expected to terminate automatically within short time, but if they cannot, they will not block the withdraw. For example, if a user process and one of the kthread decide to withdraw at the same time, only one of them will perform the actual withdraw and the other will wait for it to be done. If the kthread ends up being the one to wait, the withdrawing user process won't be able to stop it. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
67 lines
2.3 KiB
C
67 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*/
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#ifndef __SUPER_DOT_H__
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#define __SUPER_DOT_H__
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#include <linux/fs.h>
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#include <linux/dcache.h>
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#include "incore.h"
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/* Supported fs format version range */
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#define GFS2_FS_FORMAT_MIN (1801)
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#define GFS2_FS_FORMAT_MAX (1802)
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extern void gfs2_lm_unmount(struct gfs2_sbd *sdp);
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static inline unsigned int gfs2_jindex_size(struct gfs2_sbd *sdp)
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{
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unsigned int x;
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spin_lock(&sdp->sd_jindex_spin);
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x = sdp->sd_journals;
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spin_unlock(&sdp->sd_jindex_spin);
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return x;
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}
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extern void gfs2_jindex_free(struct gfs2_sbd *sdp);
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extern struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid);
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extern int gfs2_jdesc_check(struct gfs2_jdesc *jd);
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extern int gfs2_lookup_in_master_dir(struct gfs2_sbd *sdp, char *filename,
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struct gfs2_inode **ipp);
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extern int gfs2_make_fs_rw(struct gfs2_sbd *sdp);
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extern void gfs2_make_fs_ro(struct gfs2_sbd *sdp);
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extern void gfs2_online_uevent(struct gfs2_sbd *sdp);
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extern void gfs2_destroy_threads(struct gfs2_sbd *sdp);
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extern int gfs2_statfs_init(struct gfs2_sbd *sdp);
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extern void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
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s64 dinodes);
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extern void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc,
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const void *buf);
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extern void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc,
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void *buf);
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extern void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh);
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extern int gfs2_statfs_sync(struct super_block *sb, int type);
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extern void gfs2_freeze_func(struct work_struct *work);
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extern void gfs2_thaw_freeze_initiator(struct super_block *sb);
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extern void free_local_statfs_inodes(struct gfs2_sbd *sdp);
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extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,
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unsigned int index);
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extern void free_sbd(struct gfs2_sbd *sdp);
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extern struct file_system_type gfs2_fs_type;
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extern struct file_system_type gfs2meta_fs_type;
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extern const struct export_operations gfs2_export_ops;
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extern const struct super_operations gfs2_super_ops;
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extern const struct dentry_operations gfs2_dops;
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extern const struct xattr_handler *gfs2_xattr_handlers_max[];
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extern const struct xattr_handler **gfs2_xattr_handlers_min;
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#endif /* __SUPER_DOT_H__ */
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