/* * Copyright (C) International Business Machines Corp., 2000-2002 * Portions Copyright (C) Christoph Hellwig, 2001-2002 * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See * the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _H_JFS_METAPAGE #define _H_JFS_METAPAGE #include struct metapage { /* Common logsyncblk prefix (see jfs_logmgr.h) */ u16 xflag; u16 unused; lid_t lid; int lsn; struct list_head synclist; /* End of logsyncblk prefix */ unsigned long flag; /* See Below */ unsigned long count; /* Reference count */ void *data; /* Data pointer */ sector_t index; /* block address of page */ wait_queue_head_t wait; /* implementation */ struct page *page; unsigned int logical_size; /* Journal management */ int clsn; int nohomeok; struct jfs_log *log; }; /* metapage flag */ #define META_locked 0 #define META_dirty 2 #define META_sync 3 #define META_discard 4 #define META_forcewrite 5 #define META_io 6 #define mark_metapage_dirty(mp) set_bit(META_dirty, &(mp)->flag) /* function prototypes */ extern int metapage_init(void); extern void metapage_exit(void); extern struct metapage *__get_metapage(struct inode *inode, unsigned long lblock, unsigned int size, int absolute, unsigned long new); #define read_metapage(inode, lblock, size, absolute)\ __get_metapage(inode, lblock, size, absolute, false) #define get_metapage(inode, lblock, size, absolute)\ __get_metapage(inode, lblock, size, absolute, true) extern void release_metapage(struct metapage *); extern void grab_metapage(struct metapage *); extern void force_metapage(struct metapage *); /* * hold_metapage and put_metapage are used in conjunction. The page lock * is not dropped between the two, so no other threads can get or release * the metapage */ extern void hold_metapage(struct metapage *); extern void put_metapage(struct metapage *); static inline void write_metapage(struct metapage *mp) { set_bit(META_dirty, &mp->flag); release_metapage(mp); } static inline void flush_metapage(struct metapage *mp) { set_bit(META_sync, &mp->flag); write_metapage(mp); } static inline void discard_metapage(struct metapage *mp) { clear_bit(META_dirty, &mp->flag); set_bit(META_discard, &mp->flag); release_metapage(mp); } static inline void metapage_nohomeok(struct metapage *mp) { struct page *page = mp->page; lock_page(page); if (!mp->nohomeok++) { mark_metapage_dirty(mp); get_page(page); wait_on_page_writeback(page); } unlock_page(page); } /* * This serializes access to mp->lsn when metapages are added to logsynclist * without setting nohomeok. i.e. updating imap & dmap */ static inline void metapage_wait_for_io(struct metapage *mp) { if (test_bit(META_io, &mp->flag)) wait_on_page_writeback(mp->page); } /* * This is called when already holding the metapage */ static inline void _metapage_homeok(struct metapage *mp) { if (!--mp->nohomeok) put_page(mp->page); } static inline void metapage_homeok(struct metapage *mp) { hold_metapage(mp); _metapage_homeok(mp); put_metapage(mp); } extern const struct address_space_operations jfs_metapage_aops; /* * This routines invalidate all pages for an extent. */ extern void __invalidate_metapages(struct inode *, s64, int); #define invalidate_pxd_metapages(ip, pxd) \ __invalidate_metapages((ip), addressPXD(&(pxd)), lengthPXD(&(pxd))) #define invalidate_dxd_metapages(ip, dxd) \ __invalidate_metapages((ip), addressDXD(&(dxd)), lengthDXD(&(dxd))) #define invalidate_xad_metapages(ip, xad) \ __invalidate_metapages((ip), addressXAD(&(xad)), lengthXAD(&(xad))) #endif /* _H_JFS_METAPAGE */ value='2'>stat only
authorDaniel Vetter <daniel.vetter@ffwll.ch>2017-01-12 17:15:56 +0100
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-01-30 10:17:32 +0100
commite6e7b48b295afa5a5ab440de0a94d9ad8b3ce2d0 (patch)
tree77cadb6d8aad1b52c34e4afa8c9deef603bbe2ed /net/llc/llc_core.c
parent4e5b54f127426c82dc2816340c26d951a5bb3429 (diff)
drm: Don't race connector registration
I was under the misconception that the sysfs dev stuff can be fully set up, and then registered all in one step with device_add. That's true for properties and property groups, but not for parents and child devices. Those must be fully registered before you can register a child. Add a bit of tracking to make sure that asynchronous mst connector hotplugging gets this right. For consistency we rely upon the implicit barriers of the connector->mutex, which is taken anyway, to ensure that at least either the connector or device registration call will work out. Mildly tested since I can't reliably reproduce this on my mst box here. Reported-by: Dave Hansen <dave.hansen@intel.com> Cc: Dave Hansen <dave.hansen@intel.com> Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1484237756-2720-1-git-send-email-daniel.vetter@ffwll.ch
Diffstat (limited to 'net/llc/llc_core.c')