/* * Copyright (c) 2000-2006 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_VFS_H__ #define __XFS_VFS_H__ #include #include "xfs_fs.h" struct bhv_vfs; struct inode; struct fid; struct cred; struct seq_file; struct super_block; struct xfs_inode; struct xfs_mount_args; typedef struct kstatfs bhv_statvfs_t; typedef struct bhv_vfs_sync_work { struct list_head w_list; struct bhv_vfs *w_vfs; void *w_data; /* syncer routine argument */ void (*w_syncer)(struct bhv_vfs *, void *); } bhv_vfs_sync_work_t; typedef struct bhv_vfs { u_int vfs_flag; /* flags */ xfs_fsid_t vfs_fsid; /* file system ID */ xfs_fsid_t *vfs_altfsid; /* An ID fixed for life of FS */ bhv_head_t vfs_bh; /* head of vfs behavior chain */ struct super_block *vfs_super; /* generic superblock pointer */ struct task_struct *vfs_sync_task; /* generalised sync thread */ bhv_vfs_sync_work_t vfs_sync_work; /* work item for VFS_SYNC */ struct list_head vfs_sync_list; /* sync thread work item list */ spinlock_t vfs_sync_lock; /* work item list lock */ int vfs_sync_seq; /* sync thread generation no. */ wait_queue_head_t vfs_wait_single_sync_task; } bhv_vfs_t; #define bhvtovfs(bdp) ( (struct bhv_vfs *)BHV_VOBJ(bdp) ) #define bhvtovfsops(bdp) ( (struct bhv_vfsops *)BHV_OPS(bdp) ) #define VFS_BHVHEAD(vfs) ( &(vfs)->vfs_bh ) #define VFS_REMOVEBHV(vfs, bdp) ( bhv_remove(VFS_BHVHEAD(vfs), bdp) ) #define VFS_POSITION_BASE BHV_POSITION_BASE /* chain bottom */ #define VFS_POSITION_TOP BHV_POSITION_TOP /* chain top */ #define VFS_POSITION_INVALID BHV_POSITION_INVALID /* invalid pos. num */ typedef enum { VFS_BHV_UNKNOWN, /* not specified */ VFS_BHV_XFS, /* xfs */ VFS_BHV_DM, /* data migration */ VFS_BHV_QM, /* quota manager */ VFS_BHV_IO, /* IO path */ VFS_BHV_END /* housekeeping end-of-range */ } bhv_vfs_type_t; #define VFS_POSITION_XFS (BHV_POSITION_BASE) #define VFS_POSITION_DM (VFS_POSITION_BASE+10) #define VFS_POSITION_QM (VFS_POSITION_BASE+20) #define VFS_POSITION_IO (VFS_POSITION_BASE+30) #define VFS_RDONLY 0x0001 /* read-only vfs */ #define VFS_GRPID 0x0002 /* group-ID assigned from directory */ #define VFS_DMI 0x0004 /* filesystem has the DMI enabled */ /* ---- VFS_UMOUNT ---- 0x0008 -- unneeded, fixed via kthread APIs */ #define VFS_32BITINODES 0x0010 /* do not use inums above 32 bits */ #define VFS_END 0x0010 /* max flag */ #define SYNC_ATTR 0x0001 /* sync attributes */ #define SYNC_CLOSE 0x0002 /* close file system down */ #define SYNC_DELWRI 0x0004 /* look at delayed writes */ #define SYNC_WAIT 0x0008 /* wait for i/o to complete */ #define SYNC_BDFLUSH 0x0010 /* BDFLUSH is calling -- don't block */ #define SYNC_FSDATA 0x0020 /* flush fs data (e.g. superblocks) */ #define SYNC_REFCACHE 0x0040 /* prune some of the nfs ref cache */ #define SYNC_REMOUNT 0x0080 /* remount readonly, no dummy LRs */ #define SYNC_IOWAIT 0x0100 /* wait for all I/O to complete */ #define SYNC_SUPER 0x0200 /* flush superblock to disk */ /* * When remounting a filesystem read-only or freezing the filesystem, * we have two phases to execute. This first phase is syncing the data * before we quiesce the fielsystem, and the second is flushing all the * inodes out after we've waited for all the transactions created by * the first phase to complete. The second phase uses SYNC_INODE_QUIESCE * to ensure that the inodes are written to their location on disk * rather than just existing in transactions in the log. This means * after a quiesce there is no log replay required to write the inodes * to disk (this is the main difference between a sync and a quiesce). */ #define SYNC_DATA_QUIESCE (SYNC_DELWRI|SYNC_FSDATA|SYNC_WAIT|SYNC_IOWAIT) #define SYNC_INODE_QUIESCE (SYNC_REMOUNT|SYNC_ATTR|SYNC_WAIT) #define SHUTDOWN_META_IO_ERROR 0x0001 /* write attempt to metadata failed */ #define SHUTDOWN_LOG_IO_ERROR 0x0002 /* write attempt to the log failed */ #define SHUTDOWN_FORCE_UMOUNT 0x0004 /* shutdown from a forced unmount */ #define SHUTDOWN_CORRUPT_INCORE 0x0008 /* corrupt in-memory data structures */ #define SHUTDOWN_REMOTE_REQ 0x0010 /* shutdown came from remote cell */ #define SHUTDOWN_DEVICE_REQ 0x0020 /* failed all paths to the device */ typedef int (*vfs_mount_t)(bhv_desc_t *, struct xfs_mount_args *, struct cred *); typedef int (*vfs_parseargs_t)(bhv_desc_t *, char *, struct xfs_mount_args *, int); typedef int (*vfs_showargs_t)(bhv_desc_t *, struct seq_file *); typedef int (*vfs_unmount_t)(bhv_desc_t *, int, struct cred *); typedef int (*vfs_mntupdate_t)(bhv_desc_t *, int *, struct xfs_mount_args *); typedef int (*vfs_root_t)(bhv_desc_t *, struct inode **); typedef int (*vfs_statvfs_t)(bhv_desc_t *, bhv_statvfs_t *, struct inode *); typedef int (*vfs_sync_t)(bhv_desc_t *, int, struct cred *); typedef int (*vfs_vget_t)(bhv_desc_t *, struct inode **, struct fid *); typedef int (*vfs_dmapiops_t)(bhv_desc_t *, caddr_t); typedef int (*vfs_quotactl_t)(bhv_desc_t *, int, int, caddr_t); typedef void (*vfs_init_vnode_t)(bhv_desc_t *, struct inode *, struct xfs_inode *, int); typedef void (*vfs_force_shutdown_t)(bhv_desc_t *, int, char *, int); typedef void (*vfs_freeze_t)(bhv_desc_t *); typedef struct bhv_vfsops { bhv_position_t vf_position; /* behavior chain position */ vfs_mount_t vfs_mount; /* mount file system */ vfs_parseargs_t vfs_parseargs; /* parse mount options */ vfs_showargs_t vfs_showargs; /* unparse mount options */ vfs_unmount_t vfs_unmount; /* unmount file system */ vfs_mntupdate_t vfs_mntupdate; /* update file system options */ vfs_root_t vfs_root; /* get root vnode */ vfs_statvfs_t vfs_statvfs; /* file system statistics */ vfs_sync_t vfs_sync; /* flush files */ vfs_vget_t vfs_vget; /* get vnode from fid */ vfs_dmapiops_t vfs_dmapiops; /* data migration */ vfs_quotactl_t vfs_quotactl; /* disk quota */ vfs_init_vnode_t vfs_init_vnode; /* initialize a new vnode */ vfs_force_shutdown_t vfs_force_shutdown; /* crash and burn */ vfs_freeze_t vfs_freeze; /* freeze fs for snapshot */ } bhv_vfsops_t; /* * Virtual filesystem operations, operating from head bhv. */ #define VFSHEAD(v) ((v)->vfs_bh.bh_first) #define bhv_vfs_mount(v, ma,cr) vfs_mount(VFSHEAD(v), ma,cr) #define bhv_vfs_parseargs(v, o,ma,f) vfs_parseargs(VFSHEAD(v), o,ma,f) #define bhv_vfs_showargs(v, m) vfs_showargs(VFSHEAD(v), m) #define bhv_vfs_unmount(v, f,cr) vfs_unmount(VFSHEAD(v), f,cr) #define bhv_vfs_mntupdate(v, fl,args) vfs_mntupdate(VFSHEAD(v), fl,args) #define bhv_vfs_root(v, vpp) vfs_root(VFSHEAD(v), vpp) #define bhv_vfs_statvfs(v, sp,vp) vfs_statvfs(VFSHEAD(v), sp,vp) #define bhv_vfs_sync(v, flag,cr) vfs_sync(VFSHEAD(v), flag,cr) #define bhv_vfs_vget(v, vpp,fidp) vfs_vget(VFSHEAD(v), vpp,fidp) #define bhv_vfs_dmapiops(v, p) vfs_dmapiops(VFSHEAD(v), p) #define bhv_vfs_quotactl(v, c,id,p) vfs_quotactl(VFSHEAD(v), c,id,p) #define bhv_vfs_init_vnode(v, vp,b,ul) vfs_init_vnode(VFSHEAD(v), vp,b,ul) #define bhv_vfs_force_shutdown(v,u,f,l) vfs_force_shutdown(VFSHEAD(v), u,f,l) #define bhv_vfs_freeze(v) vfs_freeze(VFSHEAD(v)) /* * Virtual filesystem operations, operating from next bhv. */ #define bhv_next_vfs_mount(b, ma,cr) vfs_mount(b, ma,cr) #define bhv_next_vfs_parseargs(b, o,ma,f) vfs_parseargs(b, o,ma,f) #define bhv_next_vfs_showargs(b, m) vfs_showargs(b, m) #define bhv_next_vfs_unmount(b, f,cr) vfs_unmount(b, f,cr) #define bhv_next_vfs_mntupdate(b, fl,args) vfs_mntupdate(b, fl, args) #define bhv_next_vfs_root(b, vpp) vfs_root(b, vpp) #define bhv_next_vfs_statvfs(b, sp,vp) vfs_statvfs(b, sp,vp) #define bhv_next_vfs_sync(b, flag,cr) vfs_sync(b, flag,cr) #define bhv_next_vfs_vget(b, vpp,fidp) vfs_vget(b, vpp,fidp) #define bhv_next_vfs_dmapiops(b, p) vfs_dmapiops(b, p) #define bhv_next_vfs_quotactl(b, c,id,p) vfs_quotactl(b, c,id,p) #define bhv_next_vfs_init_vnode(b, vp,b2,ul) vfs_init_vnode(b, vp,b2,ul) #define bhv_next_force_shutdown(b, fl,f,l) vfs_force_shutdown(b, fl,f,l) #define bhv_next_vfs_freeze(b) vfs_freeze(b) extern int vfs_mount(bhv_desc_t *, struct xfs_mount_args *, struct cred *); extern int vfs_parseargs(bhv_desc_t *, char *, struct xfs_mount_args *, int); extern int vfs_showargs(bhv_desc_t *, struct seq_file *); extern int vfs_unmount(bhv_desc_t *, int, struct cred *); extern int vfs_mntupdate(bhv_desc_t *, int *, struct xfs_mount_args *); extern int vfs_root(bhv_desc_t *, struct inode **); extern int vfs_statvfs(bhv_desc_t *, bhv_statvfs_t *, struct inode *); extern int vfs_sync(bhv_desc_t *, int, struct cred *); extern int vfs_vget(bhv_desc_t *, struct inode **, struct fid *); extern int vfs_dmapiops(bhv_desc_t *, caddr_t); extern int vfs_quotactl(bhv_desc_t *, int, int, caddr_t); extern void vfs_init_vnode(bhv_desc_t *, struct inode *, struct xfs_inode *, int); extern void vfs_force_shutdown(bhv_desc_t *, int, char *, int); extern void vfs_freeze(bhv_desc_t *); #define vfs_test_for_freeze(vfs) ((vfs)->vfs_super->s_frozen) #define vfs_wait_for_freeze(vfs,l) vfs_check_frozen((vfs)->vfs_super, (l)) typedef struct bhv_module_vfsops { struct bhv_vfsops bhv_common; void * bhv_custom; } bhv_module_vfsops_t; #define vfs_bhv_lookup(v, id) (bhv_lookup_range(&(v)->vfs_bh, (id), (id))) #define vfs_bhv_custom(b) (((bhv_module_vfsops_t*)BHV_OPS(b))->bhv_custom) #define vfs_bhv_set_custom(b,o) ((b)->bhv_custom = (void *)(o)) #define vfs_bhv_clr_custom(b) ((b)->bhv_custom = NULL) extern bhv_vfs_t *vfs_allocate(struct super_block *); extern bhv_vfs_t *vfs_from_sb(struct super_block *); extern void vfs_deallocate(bhv_vfs_t *); extern void vfs_insertbhv(bhv_vfs_t *, bhv_desc_t *, bhv_vfsops_t *, void *); extern void vfs_insertops(bhv_vfs_t *, bhv_module_vfsops_t *); extern void bhv_insert_all_vfsops(struct bhv_vfs *); extern void bhv_remove_all_vfsops(struct bhv_vfs *, int); extern void bhv_remove_vfsops(struct bhv_vfs *, int); #endif /* __XFS_VFS_H__ */