mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-20 10:44:23 +08:00
b8f82a4a6f
Remove our own STATIC_INLINE macro. For small function inside implementation files just use STATIC and let gcc inline it, and for those in headers do the normal static inline - they are all small enough to be inlined for debug builds, too. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Alex Elder <aelder@sgi.com>
137 lines
4.8 KiB
C
137 lines
4.8 KiB
C
/*
|
|
* Copyright (c) 2006-2007 Silicon Graphics, Inc.
|
|
* All Rights Reserved.
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it would 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 the Free Software Foundation,
|
|
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#ifndef __XFS_FILESTREAM_H__
|
|
#define __XFS_FILESTREAM_H__
|
|
|
|
#ifdef __KERNEL__
|
|
|
|
struct xfs_mount;
|
|
struct xfs_inode;
|
|
struct xfs_perag;
|
|
struct xfs_bmalloca;
|
|
|
|
#ifdef XFS_FILESTREAMS_TRACE
|
|
#define XFS_FSTRM_KTRACE_INFO 1
|
|
#define XFS_FSTRM_KTRACE_AGSCAN 2
|
|
#define XFS_FSTRM_KTRACE_AGPICK1 3
|
|
#define XFS_FSTRM_KTRACE_AGPICK2 4
|
|
#define XFS_FSTRM_KTRACE_UPDATE 5
|
|
#define XFS_FSTRM_KTRACE_FREE 6
|
|
#define XFS_FSTRM_KTRACE_ITEM_LOOKUP 7
|
|
#define XFS_FSTRM_KTRACE_ASSOCIATE 8
|
|
#define XFS_FSTRM_KTRACE_MOVEAG 9
|
|
#define XFS_FSTRM_KTRACE_ORPHAN 10
|
|
|
|
#define XFS_FSTRM_KTRACE_SIZE 16384
|
|
extern ktrace_t *xfs_filestreams_trace_buf;
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Allocation group filestream associations are tracked with per-ag atomic
|
|
* counters. These counters allow _xfs_filestream_pick_ag() to tell whether a
|
|
* particular AG already has active filestreams associated with it. The mount
|
|
* point's m_peraglock is used to protect these counters from per-ag array
|
|
* re-allocation during a growfs operation. When xfs_growfs_data_private() is
|
|
* about to reallocate the array, it calls xfs_filestream_flush() with the
|
|
* m_peraglock held in write mode.
|
|
*
|
|
* Since xfs_mru_cache_flush() guarantees that all the free functions for all
|
|
* the cache elements have finished executing before it returns, it's safe for
|
|
* the free functions to use the atomic counters without m_peraglock protection.
|
|
* This allows the implementation of xfs_fstrm_free_func() to be agnostic about
|
|
* whether it was called with the m_peraglock held in read mode, write mode or
|
|
* not held at all. The race condition this addresses is the following:
|
|
*
|
|
* - The work queue scheduler fires and pulls a filestream directory cache
|
|
* element off the LRU end of the cache for deletion, then gets pre-empted.
|
|
* - A growfs operation grabs the m_peraglock in write mode, flushes all the
|
|
* remaining items from the cache and reallocates the mount point's per-ag
|
|
* array, resetting all the counters to zero.
|
|
* - The work queue thread resumes and calls the free function for the element
|
|
* it started cleaning up earlier. In the process it decrements the
|
|
* filestreams counter for an AG that now has no references.
|
|
*
|
|
* With a shrinkfs feature, the above scenario could panic the system.
|
|
*
|
|
* All other uses of the following macros should be protected by either the
|
|
* m_peraglock held in read mode, or the cache's internal locking exposed by the
|
|
* interval between a call to xfs_mru_cache_lookup() and a call to
|
|
* xfs_mru_cache_done(). In addition, the m_peraglock must be held in read mode
|
|
* when new elements are added to the cache.
|
|
*
|
|
* Combined, these locking rules ensure that no associations will ever exist in
|
|
* the cache that reference per-ag array elements that have since been
|
|
* reallocated.
|
|
*/
|
|
static inline int
|
|
xfs_filestream_peek_ag(
|
|
xfs_mount_t *mp,
|
|
xfs_agnumber_t agno)
|
|
{
|
|
return atomic_read(&mp->m_perag[agno].pagf_fstrms);
|
|
}
|
|
|
|
static inline int
|
|
xfs_filestream_get_ag(
|
|
xfs_mount_t *mp,
|
|
xfs_agnumber_t agno)
|
|
{
|
|
return atomic_inc_return(&mp->m_perag[agno].pagf_fstrms);
|
|
}
|
|
|
|
static inline int
|
|
xfs_filestream_put_ag(
|
|
xfs_mount_t *mp,
|
|
xfs_agnumber_t agno)
|
|
{
|
|
return atomic_dec_return(&mp->m_perag[agno].pagf_fstrms);
|
|
}
|
|
|
|
/* allocation selection flags */
|
|
typedef enum xfs_fstrm_alloc {
|
|
XFS_PICK_USERDATA = 1,
|
|
XFS_PICK_LOWSPACE = 2,
|
|
} xfs_fstrm_alloc_t;
|
|
|
|
/* prototypes for filestream.c */
|
|
int xfs_filestream_init(void);
|
|
void xfs_filestream_uninit(void);
|
|
int xfs_filestream_mount(struct xfs_mount *mp);
|
|
void xfs_filestream_unmount(struct xfs_mount *mp);
|
|
void xfs_filestream_flush(struct xfs_mount *mp);
|
|
xfs_agnumber_t xfs_filestream_lookup_ag(struct xfs_inode *ip);
|
|
int xfs_filestream_associate(struct xfs_inode *dip, struct xfs_inode *ip);
|
|
void xfs_filestream_deassociate(struct xfs_inode *ip);
|
|
int xfs_filestream_new_ag(struct xfs_bmalloca *ap, xfs_agnumber_t *agp);
|
|
|
|
|
|
/* filestreams for the inode? */
|
|
static inline int
|
|
xfs_inode_is_filestream(
|
|
struct xfs_inode *ip)
|
|
{
|
|
return (ip->i_mount->m_flags & XFS_MOUNT_FILESTREAMS) ||
|
|
xfs_iflags_test(ip, XFS_IFILESTREAM) ||
|
|
(ip->i_d.di_flags & XFS_DIFLAG_FILESTREAM);
|
|
}
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif /* __XFS_FILESTREAM_H__ */
|