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| Current File : //usr/src/sys/ufs/ffs/softdep.h |
/*-
* Copyright 1998, 2000 Marshall Kirk McKusick. All Rights Reserved.
*
* The soft updates code is derived from the appendix of a University
* of Michigan technical report (Gregory R. Ganger and Yale N. Patt,
* "Soft Updates: A Solution to the Metadata Update Problem in File
* Systems", CSE-TR-254-95, August 1995).
*
* Further information about soft updates can be obtained from:
*
* Marshall Kirk McKusick http://www.mckusick.com/softdep/
* 1614 Oxford Street mckusick@mckusick.com
* Berkeley, CA 94709-1608 +1-510-843-9542
* USA
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)softdep.h 9.7 (McKusick) 6/21/00
* $FreeBSD: release/9.1.0/sys/ufs/ffs/softdep.h 223772 2011-07-04 22:08:04Z jeff $
*/
#include <sys/queue.h>
/*
* Allocation dependencies are handled with undo/redo on the in-memory
* copy of the data. A particular data dependency is eliminated when
* it is ALLCOMPLETE: that is ATTACHED, DEPCOMPLETE, and COMPLETE.
*
* The ATTACHED flag means that the data is not currently being written
* to disk.
*
* The UNDONE flag means that the data has been rolled back to a safe
* state for writing to the disk. When the I/O completes, the data is
* restored to its current form and the state reverts to ATTACHED.
* The data must be locked throughout the rollback, I/O, and roll
* forward so that the rolled back information is never visible to
* user processes.
*
* The COMPLETE flag indicates that the item has been written. For example,
* a dependency that requires that an inode be written will be marked
* COMPLETE after the inode has been written to disk.
*
* The DEPCOMPLETE flag indicates the completion of any other
* dependencies such as the writing of a cylinder group map has been
* completed. A dependency structure may be freed only when both it
* and its dependencies have completed and any rollbacks that are in
* progress have finished as indicated by the set of ALLCOMPLETE flags
* all being set.
*
* The two MKDIR flags indicate additional dependencies that must be done
* when creating a new directory. MKDIR_BODY is cleared when the directory
* data block containing the "." and ".." entries has been written.
* MKDIR_PARENT is cleared when the parent inode with the increased link
* count for ".." has been written. When both MKDIR flags have been
* cleared, the DEPCOMPLETE flag is set to indicate that the directory
* dependencies have been completed. The writing of the directory inode
* itself sets the COMPLETE flag which then allows the directory entry for
* the new directory to be written to disk. The RMDIR flag marks a dirrem
* structure as representing the removal of a directory rather than a
* file. When the removal dependencies are completed, additional work needs
* to be done* (an additional decrement of the associated inode, and a
* decrement of the parent inode).
*
* The DIRCHG flag marks a diradd structure as representing the changing
* of an existing entry rather than the addition of a new one. When
* the update is complete the dirrem associated with the inode for
* the old name must be added to the worklist to do the necessary
* reference count decrement.
*
* The GOINGAWAY flag indicates that the data structure is frozen from
* further change until its dependencies have been completed and its
* resources freed after which it will be discarded.
*
* The IOSTARTED flag prevents multiple calls to the I/O start routine from
* doing multiple rollbacks.
*
* The NEWBLOCK flag marks pagedep structures that have just been allocated,
* so must be claimed by the inode before all dependencies are complete.
*
* The INPROGRESS flag marks worklist structures that are still on the
* worklist, but are being considered for action by some process.
*
* The UFS1FMT flag indicates that the inode being processed is a ufs1 format.
*
* The EXTDATA flag indicates that the allocdirect describes an
* extended-attributes dependency.
*
* The ONWORKLIST flag shows whether the structure is currently linked
* onto a worklist.
*
* The UNLINK* flags track the progress of updating the on-disk linked
* list of active but unlinked inodes. When an inode is first unlinked
* it is marked as UNLINKED. When its on-disk di_freelink has been
* written its UNLINKNEXT flags is set. When its predecessor in the
* list has its di_freelink pointing at us its UNLINKPREV is set.
* When the on-disk list can reach it from the superblock, its
* UNLINKONLIST flag is set. Once all of these flags are set, it
* is safe to let its last name be removed.
*/
#define ATTACHED 0x000001
#define UNDONE 0x000002
#define COMPLETE 0x000004
#define DEPCOMPLETE 0x000008
#define MKDIR_PARENT 0x000010 /* diradd, mkdir, jaddref, jsegdep only */
#define MKDIR_BODY 0x000020 /* diradd, mkdir, jaddref only */
#define RMDIR 0x000040 /* dirrem only */
#define DIRCHG 0x000080 /* diradd, dirrem only */
#define GOINGAWAY 0x000100 /* indirdep, jremref only */
#define IOSTARTED 0x000200 /* inodedep, pagedep, bmsafemap only */
#define DELAYEDFREE 0x000400 /* allocindirect free delayed. */
#define NEWBLOCK 0x000800 /* pagedep, jaddref only */
#define INPROGRESS 0x001000 /* dirrem, freeblks, freefrag, freefile only */
#define UFS1FMT 0x002000 /* indirdep only */
#define EXTDATA 0x004000 /* allocdirect only */
#define ONWORKLIST 0x008000
#define IOWAITING 0x010000 /* Thread is waiting for IO to complete. */
#define ONDEPLIST 0x020000 /* Structure is on a dependency list. */
#define UNLINKED 0x040000 /* inodedep has been unlinked. */
#define UNLINKNEXT 0x080000 /* inodedep has valid di_freelink */
#define UNLINKPREV 0x100000 /* inodedep is pointed at in the unlink list */
#define UNLINKONLIST 0x200000 /* inodedep is in the unlinked list on disk */
#define UNLINKLINKS (UNLINKNEXT | UNLINKPREV)
#define ALLCOMPLETE (ATTACHED | COMPLETE | DEPCOMPLETE)
/*
* The workitem queue.
*
* It is sometimes useful and/or necessary to clean up certain dependencies
* in the background rather than during execution of an application process
* or interrupt service routine. To realize this, we append dependency
* structures corresponding to such tasks to a "workitem" queue. In a soft
* updates implementation, most pending workitems should not wait for more
* than a couple of seconds, so the filesystem syncer process awakens once
* per second to process the items on the queue.
*/
/* LIST_HEAD(workhead, worklist); -- declared in buf.h */
/*
* Each request can be linked onto a work queue through its worklist structure.
* To avoid the need for a pointer to the structure itself, this structure
* MUST be declared FIRST in each type in which it appears! If more than one
* worklist is needed in the structure, then a wk_data field must be added
* and the macros below changed to use it.
*/
struct worklist {
LIST_ENTRY(worklist) wk_list; /* list of work requests */
struct mount *wk_mp; /* Mount we live in */
unsigned int wk_type:8, /* type of request */
wk_state:24; /* state flags */
};
#define WK_DATA(wk) ((void *)(wk))
#define WK_PAGEDEP(wk) ((struct pagedep *)(wk))
#define WK_INODEDEP(wk) ((struct inodedep *)(wk))
#define WK_BMSAFEMAP(wk) ((struct bmsafemap *)(wk))
#define WK_NEWBLK(wk) ((struct newblk *)(wk))
#define WK_ALLOCDIRECT(wk) ((struct allocdirect *)(wk))
#define WK_INDIRDEP(wk) ((struct indirdep *)(wk))
#define WK_ALLOCINDIR(wk) ((struct allocindir *)(wk))
#define WK_FREEFRAG(wk) ((struct freefrag *)(wk))
#define WK_FREEBLKS(wk) ((struct freeblks *)(wk))
#define WK_FREEWORK(wk) ((struct freework *)(wk))
#define WK_FREEFILE(wk) ((struct freefile *)(wk))
#define WK_DIRADD(wk) ((struct diradd *)(wk))
#define WK_MKDIR(wk) ((struct mkdir *)(wk))
#define WK_DIRREM(wk) ((struct dirrem *)(wk))
#define WK_NEWDIRBLK(wk) ((struct newdirblk *)(wk))
#define WK_JADDREF(wk) ((struct jaddref *)(wk))
#define WK_JREMREF(wk) ((struct jremref *)(wk))
#define WK_JMVREF(wk) ((struct jmvref *)(wk))
#define WK_JSEGDEP(wk) ((struct jsegdep *)(wk))
#define WK_JSEG(wk) ((struct jseg *)(wk))
#define WK_JNEWBLK(wk) ((struct jnewblk *)(wk))
#define WK_JFREEBLK(wk) ((struct jfreeblk *)(wk))
#define WK_FREEDEP(wk) ((struct freedep *)(wk))
#define WK_JFREEFRAG(wk) ((struct jfreefrag *)(wk))
#define WK_SBDEP(wk) ((struct sbdep *)(wk))
#define WK_JTRUNC(wk) ((struct jtrunc *)(wk))
#define WK_JFSYNC(wk) ((struct jfsync *)(wk))
/*
* Various types of lists
*/
LIST_HEAD(dirremhd, dirrem);
LIST_HEAD(diraddhd, diradd);
LIST_HEAD(newblkhd, newblk);
LIST_HEAD(inodedephd, inodedep);
LIST_HEAD(allocindirhd, allocindir);
LIST_HEAD(allocdirecthd, allocdirect);
TAILQ_HEAD(allocdirectlst, allocdirect);
LIST_HEAD(indirdephd, indirdep);
LIST_HEAD(jaddrefhd, jaddref);
LIST_HEAD(jremrefhd, jremref);
LIST_HEAD(jmvrefhd, jmvref);
LIST_HEAD(jnewblkhd, jnewblk);
LIST_HEAD(jblkdephd, jblkdep);
LIST_HEAD(freeworkhd, freework);
TAILQ_HEAD(freeworklst, freework);
TAILQ_HEAD(jseglst, jseg);
TAILQ_HEAD(inoreflst, inoref);
TAILQ_HEAD(freeblklst, freeblks);
/*
* The "pagedep" structure tracks the various dependencies related to
* a particular directory page. If a directory page has any dependencies,
* it will have a pagedep linked to its associated buffer. The
* pd_dirremhd list holds the list of dirrem requests which decrement
* inode reference counts. These requests are processed after the
* directory page with the corresponding zero'ed entries has been
* written. The pd_diraddhd list maintains the list of diradd requests
* which cannot be committed until their corresponding inode has been
* written to disk. Because a directory may have many new entries
* being created, several lists are maintained hashed on bits of the
* offset of the entry into the directory page to keep the lists from
* getting too long. Once a new directory entry has been cleared to
* be written, it is moved to the pd_pendinghd list. After the new
* entry has been written to disk it is removed from the pd_pendinghd
* list, any removed operations are done, and the dependency structure
* is freed.
*/
#define DAHASHSZ 5
#define DIRADDHASH(offset) (((offset) >> 2) % DAHASHSZ)
struct pagedep {
struct worklist pd_list; /* page buffer */
# define pd_state pd_list.wk_state /* check for multiple I/O starts */
LIST_ENTRY(pagedep) pd_hash; /* hashed lookup */
ino_t pd_ino; /* associated file */
ufs_lbn_t pd_lbn; /* block within file */
struct newdirblk *pd_newdirblk; /* associated newdirblk if NEWBLOCK */
struct dirremhd pd_dirremhd; /* dirrem's waiting for page */
struct diraddhd pd_diraddhd[DAHASHSZ]; /* diradd dir entry updates */
struct diraddhd pd_pendinghd; /* directory entries awaiting write */
struct jmvrefhd pd_jmvrefhd; /* Dependent journal writes. */
};
/*
* The "inodedep" structure tracks the set of dependencies associated
* with an inode. One task that it must manage is delayed operations
* (i.e., work requests that must be held until the inodedep's associated
* inode has been written to disk). Getting an inode from its incore
* state to the disk requires two steps to be taken by the filesystem
* in this order: first the inode must be copied to its disk buffer by
* the VOP_UPDATE operation; second the inode's buffer must be written
* to disk. To ensure that both operations have happened in the required
* order, the inodedep maintains two lists. Delayed operations are
* placed on the id_inowait list. When the VOP_UPDATE is done, all
* operations on the id_inowait list are moved to the id_bufwait list.
* When the buffer is written, the items on the id_bufwait list can be
* safely moved to the work queue to be processed. A second task of the
* inodedep structure is to track the status of block allocation within
* the inode. Each block that is allocated is represented by an
* "allocdirect" structure (see below). It is linked onto the id_newinoupdt
* list until both its contents and its allocation in the cylinder
* group map have been written to disk. Once these dependencies have been
* satisfied, it is removed from the id_newinoupdt list and any followup
* actions such as releasing the previous block or fragment are placed
* on the id_inowait list. When an inode is updated (a VOP_UPDATE is
* done), the "inodedep" structure is linked onto the buffer through
* its worklist. Thus, it will be notified when the buffer is about
* to be written and when it is done. At the update time, all the
* elements on the id_newinoupdt list are moved to the id_inoupdt list
* since those changes are now relevant to the copy of the inode in the
* buffer. Also at update time, the tasks on the id_inowait list are
* moved to the id_bufwait list so that they will be executed when
* the updated inode has been written to disk. When the buffer containing
* the inode is written to disk, any updates listed on the id_inoupdt
* list are rolled back as they are not yet safe. Following the write,
* the changes are once again rolled forward and any actions on the
* id_bufwait list are processed (since those actions are now safe).
* The entries on the id_inoupdt and id_newinoupdt lists must be kept
* sorted by logical block number to speed the calculation of the size
* of the rolled back inode (see explanation in initiate_write_inodeblock).
* When a directory entry is created, it is represented by a diradd.
* The diradd is added to the id_inowait list as it cannot be safely
* written to disk until the inode that it represents is on disk. After
* the inode is written, the id_bufwait list is processed and the diradd
* entries are moved to the id_pendinghd list where they remain until
* the directory block containing the name has been written to disk.
* The purpose of keeping the entries on the id_pendinghd list is so that
* the softdep_fsync function can find and push the inode's directory
* name(s) as part of the fsync operation for that file.
*/
struct inodedep {
struct worklist id_list; /* buffer holding inode block */
# define id_state id_list.wk_state /* inode dependency state */
LIST_ENTRY(inodedep) id_hash; /* hashed lookup */
TAILQ_ENTRY(inodedep) id_unlinked; /* Unlinked but ref'd inodes */
struct fs *id_fs; /* associated filesystem */
ino_t id_ino; /* dependent inode */
nlink_t id_nlinkdelta; /* saved effective link count */
nlink_t id_savednlink; /* Link saved during rollback */
LIST_ENTRY(inodedep) id_deps; /* bmsafemap's list of inodedep's */
struct bmsafemap *id_bmsafemap; /* related bmsafemap (if pending) */
struct diradd *id_mkdiradd; /* diradd for a mkdir. */
struct inoreflst id_inoreflst; /* Inode reference adjustments. */
long id_savedextsize; /* ext size saved during rollback */
off_t id_savedsize; /* file size saved during rollback */
struct dirremhd id_dirremhd; /* Removals pending. */
struct workhead id_pendinghd; /* entries awaiting directory write */
struct workhead id_bufwait; /* operations after inode written */
struct workhead id_inowait; /* operations waiting inode update */
struct allocdirectlst id_inoupdt; /* updates before inode written */
struct allocdirectlst id_newinoupdt; /* updates when inode written */
struct allocdirectlst id_extupdt; /* extdata updates pre-inode write */
struct allocdirectlst id_newextupdt; /* extdata updates at ino write */
struct freeblklst id_freeblklst; /* List of partial truncates. */
union {
struct ufs1_dinode *idu_savedino1; /* saved ufs1_dinode contents */
struct ufs2_dinode *idu_savedino2; /* saved ufs2_dinode contents */
} id_un;
};
#define id_savedino1 id_un.idu_savedino1
#define id_savedino2 id_un.idu_savedino2
/*
* A "bmsafemap" structure maintains a list of dependency structures
* that depend on the update of a particular cylinder group map.
* It has lists for newblks, allocdirects, allocindirs, and inodedeps.
* It is attached to the buffer of a cylinder group block when any of
* these things are allocated from the cylinder group. It is freed
* after the cylinder group map is written and the state of its
* dependencies are updated with DEPCOMPLETE to indicate that it has
* been processed.
*/
struct bmsafemap {
struct worklist sm_list; /* cylgrp buffer */
# define sm_state sm_list.wk_state
LIST_ENTRY(bmsafemap) sm_hash; /* Hash links. */
LIST_ENTRY(bmsafemap) sm_next; /* Mount list. */
int sm_cg;
struct buf *sm_buf; /* associated buffer */
struct allocdirecthd sm_allocdirecthd; /* allocdirect deps */
struct allocdirecthd sm_allocdirectwr; /* writing allocdirect deps */
struct allocindirhd sm_allocindirhd; /* allocindir deps */
struct allocindirhd sm_allocindirwr; /* writing allocindir deps */
struct inodedephd sm_inodedephd; /* inodedep deps */
struct inodedephd sm_inodedepwr; /* writing inodedep deps */
struct newblkhd sm_newblkhd; /* newblk deps */
struct newblkhd sm_newblkwr; /* writing newblk deps */
struct jaddrefhd sm_jaddrefhd; /* Pending inode allocations. */
struct jnewblkhd sm_jnewblkhd; /* Pending block allocations. */
struct workhead sm_freehd; /* Freedep deps. */
struct workhead sm_freewr; /* Written freedeps. */
};
/*
* A "newblk" structure is attached to a bmsafemap structure when a block
* or fragment is allocated from a cylinder group. Its state is set to
* DEPCOMPLETE when its cylinder group map is written. It is converted to
* an allocdirect or allocindir allocation once the allocator calls the
* appropriate setup function. It will initially be linked onto a bmsafemap
* list. Once converted it can be linked onto the lists described for
* allocdirect or allocindir as described below.
*/
struct newblk {
struct worklist nb_list; /* See comment above. */
# define nb_state nb_list.wk_state
LIST_ENTRY(newblk) nb_hash; /* Hashed lookup. */
LIST_ENTRY(newblk) nb_deps; /* Bmsafemap's list of newblks. */
struct jnewblk *nb_jnewblk; /* New block journal entry. */
struct bmsafemap *nb_bmsafemap;/* Cylgrp dep (if pending). */
struct freefrag *nb_freefrag; /* Fragment to be freed (if any). */
struct indirdephd nb_indirdeps; /* Children indirect blocks. */
struct workhead nb_newdirblk; /* Dir block to notify when written. */
struct workhead nb_jwork; /* Journal work pending. */
ufs2_daddr_t nb_newblkno; /* New value of block pointer. */
};
/*
* An "allocdirect" structure is attached to an "inodedep" when a new block
* or fragment is allocated and pointed to by the inode described by
* "inodedep". The worklist is linked to the buffer that holds the block.
* When the block is first allocated, it is linked to the bmsafemap
* structure associated with the buffer holding the cylinder group map
* from which it was allocated. When the cylinder group map is written
* to disk, ad_state has the DEPCOMPLETE flag set. When the block itself
* is written, the COMPLETE flag is set. Once both the cylinder group map
* and the data itself have been written, it is safe to write the inode
* that claims the block. If there was a previous fragment that had been
* allocated before the file was increased in size, the old fragment may
* be freed once the inode claiming the new block is written to disk.
* This ad_fragfree request is attached to the id_inowait list of the
* associated inodedep (pointed to by ad_inodedep) for processing after
* the inode is written. When a block is allocated to a directory, an
* fsync of a file whose name is within that block must ensure not only
* that the block containing the file name has been written, but also
* that the on-disk inode references that block. When a new directory
* block is created, we allocate a newdirblk structure which is linked
* to the associated allocdirect (on its ad_newdirblk list). When the
* allocdirect has been satisfied, the newdirblk structure is moved to
* the inodedep id_bufwait list of its directory to await the inode
* being written. When the inode is written, the directory entries are
* fully committed and can be deleted from their pagedep->id_pendinghd
* and inodedep->id_pendinghd lists.
*/
struct allocdirect {
struct newblk ad_block; /* Common block logic */
# define ad_state ad_block.nb_list.wk_state /* block pointer state */
TAILQ_ENTRY(allocdirect) ad_next; /* inodedep's list of allocdirect's */
struct inodedep *ad_inodedep; /* associated inodedep */
ufs2_daddr_t ad_oldblkno; /* old value of block pointer */
int ad_offset; /* Pointer offset in parent. */
long ad_newsize; /* size of new block */
long ad_oldsize; /* size of old block */
};
#define ad_newblkno ad_block.nb_newblkno
#define ad_freefrag ad_block.nb_freefrag
#define ad_newdirblk ad_block.nb_newdirblk
/*
* A single "indirdep" structure manages all allocation dependencies for
* pointers in an indirect block. The up-to-date state of the indirect
* block is stored in ir_savedata. The set of pointers that may be safely
* written to the disk is stored in ir_safecopy. The state field is used
* only to track whether the buffer is currently being written (in which
* case it is not safe to update ir_safecopy). Ir_deplisthd contains the
* list of allocindir structures, one for each block that needs to be
* written to disk. Once the block and its bitmap allocation have been
* written the safecopy can be updated to reflect the allocation and the
* allocindir structure freed. If ir_state indicates that an I/O on the
* indirect block is in progress when ir_safecopy is to be updated, the
* update is deferred by placing the allocindir on the ir_donehd list.
* When the I/O on the indirect block completes, the entries on the
* ir_donehd list are processed by updating their corresponding ir_safecopy
* pointers and then freeing the allocindir structure.
*/
struct indirdep {
struct worklist ir_list; /* buffer holding indirect block */
# define ir_state ir_list.wk_state /* indirect block pointer state */
LIST_ENTRY(indirdep) ir_next; /* alloc{direct,indir} list */
TAILQ_HEAD(, freework) ir_trunc; /* List of truncations. */
caddr_t ir_saveddata; /* buffer cache contents */
struct buf *ir_savebp; /* buffer holding safe copy */
struct buf *ir_bp; /* buffer holding live copy */
struct allocindirhd ir_completehd; /* waiting for indirdep complete */
struct allocindirhd ir_writehd; /* Waiting for the pointer write. */
struct allocindirhd ir_donehd; /* done waiting to update safecopy */
struct allocindirhd ir_deplisthd; /* allocindir deps for this block */
struct freeblks *ir_freeblks; /* Freeblks that frees this indir. */
};
/*
* An "allocindir" structure is attached to an "indirdep" when a new block
* is allocated and pointed to by the indirect block described by the
* "indirdep". The worklist is linked to the buffer that holds the new block.
* When the block is first allocated, it is linked to the bmsafemap
* structure associated with the buffer holding the cylinder group map
* from which it was allocated. When the cylinder group map is written
* to disk, ai_state has the DEPCOMPLETE flag set. When the block itself
* is written, the COMPLETE flag is set. Once both the cylinder group map
* and the data itself have been written, it is safe to write the entry in
* the indirect block that claims the block; the "allocindir" dependency
* can then be freed as it is no longer applicable.
*/
struct allocindir {
struct newblk ai_block; /* Common block area */
# define ai_state ai_block.nb_list.wk_state /* indirect pointer state */
LIST_ENTRY(allocindir) ai_next; /* indirdep's list of allocindir's */
struct indirdep *ai_indirdep; /* address of associated indirdep */
ufs2_daddr_t ai_oldblkno; /* old value of block pointer */
ufs_lbn_t ai_lbn; /* Logical block number. */
int ai_offset; /* Pointer offset in parent. */
};
#define ai_newblkno ai_block.nb_newblkno
#define ai_freefrag ai_block.nb_freefrag
#define ai_newdirblk ai_block.nb_newdirblk
/*
* The allblk union is used to size the newblk structure on allocation so
* that it may be any one of three types.
*/
union allblk {
struct allocindir ab_allocindir;
struct allocdirect ab_allocdirect;
struct newblk ab_newblk;
};
/*
* A "freefrag" structure is attached to an "inodedep" when a previously
* allocated fragment is replaced with a larger fragment, rather than extended.
* The "freefrag" structure is constructed and attached when the replacement
* block is first allocated. It is processed after the inode claiming the
* bigger block that replaces it has been written to disk.
*/
struct freefrag {
struct worklist ff_list; /* id_inowait or delayed worklist */
# define ff_state ff_list.wk_state
struct worklist *ff_jdep; /* Associated journal entry. */
struct workhead ff_jwork; /* Journal work pending. */
ufs2_daddr_t ff_blkno; /* fragment physical block number */
long ff_fragsize; /* size of fragment being deleted */
ino_t ff_inum; /* owning inode number */
enum vtype ff_vtype; /* owning inode's file type */
};
/*
* A "freeblks" structure is attached to an "inodedep" when the
* corresponding file's length is reduced to zero. It records all
* the information needed to free the blocks of a file after its
* zero'ed inode has been written to disk. The actual work is done
* by child freework structures which are responsible for individual
* inode pointers while freeblks is responsible for retiring the
* entire operation when it is complete and holding common members.
*/
struct freeblks {
struct worklist fb_list; /* id_inowait or delayed worklist */
# define fb_state fb_list.wk_state /* inode and dirty block state */
TAILQ_ENTRY(freeblks) fb_next; /* List of inode truncates. */
struct jblkdephd fb_jblkdephd; /* Journal entries pending */
struct workhead fb_freeworkhd; /* Work items pending */
struct workhead fb_jwork; /* Journal work pending */
struct vnode *fb_devvp; /* filesystem device vnode */
#ifdef QUOTA
struct dquot *fb_quota[MAXQUOTAS]; /* quotas to be adjusted */
#endif
uint64_t fb_modrev; /* Inode revision at start of trunc. */
off_t fb_len; /* Length we're truncating to. */
ufs2_daddr_t fb_chkcnt; /* Blocks released. */
ino_t fb_inum; /* inode owner of blocks */
enum vtype fb_vtype; /* inode owner's file type */
uid_t fb_uid; /* uid of previous owner of blocks */
int fb_ref; /* Children outstanding. */
int fb_cgwait; /* cg writes outstanding. */
};
/*
* A "freework" structure handles the release of a tree of blocks or a single
* block. Each indirect block in a tree is allocated its own freework
* structure so that the indirect block may be freed only when all of its
* children are freed. In this way we enforce the rule that an allocated
* block must have a valid path to a root that is journaled. Each child
* block acquires a reference and when the ref hits zero the parent ref
* is decremented. If there is no parent the freeblks ref is decremented.
*/
struct freework {
struct worklist fw_list; /* Delayed worklist. */
# define fw_state fw_list.wk_state
LIST_ENTRY(freework) fw_segs; /* Seg list. */
TAILQ_ENTRY(freework) fw_next; /* Hash/Trunc list. */
struct jnewblk *fw_jnewblk; /* Journal entry to cancel. */
struct freeblks *fw_freeblks; /* Root of operation. */
struct freework *fw_parent; /* Parent indirect. */
struct indirdep *fw_indir; /* indirect block. */
ufs2_daddr_t fw_blkno; /* Our block #. */
ufs_lbn_t fw_lbn; /* Original lbn before free. */
uint16_t fw_frags; /* Number of frags. */
uint16_t fw_ref; /* Number of children out. */
uint16_t fw_off; /* Current working position. */
uint16_t fw_start; /* Start of partial truncate. */
};
/*
* A "freedep" structure is allocated to track the completion of a bitmap
* write for a freework. One freedep may cover many freed blocks so long
* as they reside in the same cylinder group. When the cg is written
* the freedep decrements the ref on the freework which may permit it
* to be freed as well.
*/
struct freedep {
struct worklist fd_list; /* Delayed worklist. */
struct freework *fd_freework; /* Parent freework. */
};
/*
* A "freefile" structure is attached to an inode when its
* link count is reduced to zero. It marks the inode as free in
* the cylinder group map after the zero'ed inode has been written
* to disk and any associated blocks and fragments have been freed.
*/
struct freefile {
struct worklist fx_list; /* id_inowait or delayed worklist */
mode_t fx_mode; /* mode of inode */
ino_t fx_oldinum; /* inum of the unlinked file */
struct vnode *fx_devvp; /* filesystem device vnode */
struct workhead fx_jwork; /* journal work pending. */
};
/*
* A "diradd" structure is linked to an "inodedep" id_inowait list when a
* new directory entry is allocated that references the inode described
* by "inodedep". When the inode itself is written (either the initial
* allocation for new inodes or with the increased link count for
* existing inodes), the COMPLETE flag is set in da_state. If the entry
* is for a newly allocated inode, the "inodedep" structure is associated
* with a bmsafemap which prevents the inode from being written to disk
* until the cylinder group has been updated. Thus the da_state COMPLETE
* flag cannot be set until the inode bitmap dependency has been removed.
* When creating a new file, it is safe to write the directory entry that
* claims the inode once the referenced inode has been written. Since
* writing the inode clears the bitmap dependencies, the DEPCOMPLETE flag
* in the diradd can be set unconditionally when creating a file. When
* creating a directory, there are two additional dependencies described by
* mkdir structures (see their description below). When these dependencies
* are resolved the DEPCOMPLETE flag is set in the diradd structure.
* If there are multiple links created to the same inode, there will be
* a separate diradd structure created for each link. The diradd is
* linked onto the pg_diraddhd list of the pagedep for the directory
* page that contains the entry. When a directory page is written,
* the pg_diraddhd list is traversed to rollback any entries that are
* not yet ready to be written to disk. If a directory entry is being
* changed (by rename) rather than added, the DIRCHG flag is set and
* the da_previous entry points to the entry that will be "removed"
* once the new entry has been committed. During rollback, entries
* with da_previous are replaced with the previous inode number rather
* than zero.
*
* The overlaying of da_pagedep and da_previous is done to keep the
* structure down. If a da_previous entry is present, the pointer to its
* pagedep is available in the associated dirrem entry. If the DIRCHG flag
* is set, the da_previous entry is valid; if not set the da_pagedep entry
* is valid. The DIRCHG flag never changes; it is set when the structure
* is created if appropriate and is never cleared.
*/
struct diradd {
struct worklist da_list; /* id_inowait or id_pendinghd list */
# define da_state da_list.wk_state /* state of the new directory entry */
LIST_ENTRY(diradd) da_pdlist; /* pagedep holding directory block */
doff_t da_offset; /* offset of new dir entry in dir blk */
ino_t da_newinum; /* inode number for the new dir entry */
union {
struct dirrem *dau_previous; /* entry being replaced in dir change */
struct pagedep *dau_pagedep; /* pagedep dependency for addition */
} da_un;
struct workhead da_jwork; /* Journal work awaiting completion. */
};
#define da_previous da_un.dau_previous
#define da_pagedep da_un.dau_pagedep
/*
* Two "mkdir" structures are needed to track the additional dependencies
* associated with creating a new directory entry. Normally a directory
* addition can be committed as soon as the newly referenced inode has been
* written to disk with its increased link count. When a directory is
* created there are two additional dependencies: writing the directory
* data block containing the "." and ".." entries (MKDIR_BODY) and writing
* the parent inode with the increased link count for ".." (MKDIR_PARENT).
* These additional dependencies are tracked by two mkdir structures that
* reference the associated "diradd" structure. When they have completed,
* they set the DEPCOMPLETE flag on the diradd so that it knows that its
* extra dependencies have been completed. The md_state field is used only
* to identify which type of dependency the mkdir structure is tracking.
* It is not used in the mainline code for any purpose other than consistency
* checking. All the mkdir structures in the system are linked together on
* a list. This list is needed so that a diradd can find its associated
* mkdir structures and deallocate them if it is prematurely freed (as for
* example if a mkdir is immediately followed by a rmdir of the same directory).
* Here, the free of the diradd must traverse the list to find the associated
* mkdir structures that reference it. The deletion would be faster if the
* diradd structure were simply augmented to have two pointers that referenced
* the associated mkdir's. However, this would increase the size of the diradd
* structure to speed a very infrequent operation.
*/
struct mkdir {
struct worklist md_list; /* id_inowait or buffer holding dir */
# define md_state md_list.wk_state /* type: MKDIR_PARENT or MKDIR_BODY */
struct diradd *md_diradd; /* associated diradd */
struct jaddref *md_jaddref; /* dependent jaddref. */
struct buf *md_buf; /* MKDIR_BODY: buffer holding dir */
LIST_ENTRY(mkdir) md_mkdirs; /* list of all mkdirs */
};
/*
* A "dirrem" structure describes an operation to decrement the link
* count on an inode. The dirrem structure is attached to the pg_dirremhd
* list of the pagedep for the directory page that contains the entry.
* It is processed after the directory page with the deleted entry has
* been written to disk.
*/
struct dirrem {
struct worklist dm_list; /* delayed worklist */
# define dm_state dm_list.wk_state /* state of the old directory entry */
LIST_ENTRY(dirrem) dm_next; /* pagedep's list of dirrem's */
LIST_ENTRY(dirrem) dm_inonext; /* inodedep's list of dirrem's */
struct jremrefhd dm_jremrefhd; /* Pending remove reference deps. */
ino_t dm_oldinum; /* inum of the removed dir entry */
doff_t dm_offset; /* offset of removed dir entry in blk */
union {
struct pagedep *dmu_pagedep; /* pagedep dependency for remove */
ino_t dmu_dirinum; /* parent inode number (for rmdir) */
} dm_un;
struct workhead dm_jwork; /* Journal work awaiting completion. */
};
#define dm_pagedep dm_un.dmu_pagedep
#define dm_dirinum dm_un.dmu_dirinum
/*
* A "newdirblk" structure tracks the progress of a newly allocated
* directory block from its creation until it is claimed by its on-disk
* inode. When a block is allocated to a directory, an fsync of a file
* whose name is within that block must ensure not only that the block
* containing the file name has been written, but also that the on-disk
* inode references that block. When a new directory block is created,
* we allocate a newdirblk structure which is linked to the associated
* allocdirect (on its ad_newdirblk list). When the allocdirect has been
* satisfied, the newdirblk structure is moved to the inodedep id_bufwait
* list of its directory to await the inode being written. When the inode
* is written, the directory entries are fully committed and can be
* deleted from their pagedep->id_pendinghd and inodedep->id_pendinghd
* lists. Note that we could track directory blocks allocated to indirect
* blocks using a similar scheme with the allocindir structures. Rather
* than adding this level of complexity, we simply write those newly
* allocated indirect blocks synchronously as such allocations are rare.
* In the case of a new directory the . and .. links are tracked with
* a mkdir rather than a pagedep. In this case we track the mkdir
* so it can be released when it is written. A workhead is used
* to simplify canceling a mkdir that is removed by a subsequent dirrem.
*/
struct newdirblk {
struct worklist db_list; /* id_inowait or pg_newdirblk */
# define db_state db_list.wk_state
struct pagedep *db_pagedep; /* associated pagedep */
struct workhead db_mkdir;
};
/*
* The inoref structure holds the elements common to jaddref and jremref
* so they may easily be queued in-order on the inodedep.
*/
struct inoref {
struct worklist if_list; /* Journal pending or jseg entries. */
# define if_state if_list.wk_state
TAILQ_ENTRY(inoref) if_deps; /* Links for inodedep. */
struct jsegdep *if_jsegdep; /* Will track our journal record. */
off_t if_diroff; /* Directory offset. */
ino_t if_ino; /* Inode number. */
ino_t if_parent; /* Parent inode number. */
nlink_t if_nlink; /* nlink before addition. */
uint16_t if_mode; /* File mode, needed for IFMT. */
};
/*
* A "jaddref" structure tracks a new reference (link count) on an inode
* and prevents the link count increase and bitmap allocation until a
* journal entry can be written. Once the journal entry is written,
* the inode is put on the pendinghd of the bmsafemap and a diradd or
* mkdir entry is placed on the bufwait list of the inode. The DEPCOMPLETE
* flag is used to indicate that all of the required information for writing
* the journal entry is present. MKDIR_BODY and MKDIR_PARENT are used to
* differentiate . and .. links from regular file names. NEWBLOCK indicates
* a bitmap is still pending. If a new reference is canceled by a delete
* prior to writing the journal the jaddref write is canceled and the
* structure persists to prevent any disk-visible changes until it is
* ultimately released when the file is freed or the link is dropped again.
*/
struct jaddref {
struct inoref ja_ref; /* see inoref above. */
# define ja_list ja_ref.if_list /* Jrnl pending, id_inowait, dm_jwork.*/
# define ja_state ja_ref.if_list.wk_state
LIST_ENTRY(jaddref) ja_bmdeps; /* Links for bmsafemap. */
union {
struct diradd *jau_diradd; /* Pending diradd. */
struct mkdir *jau_mkdir; /* MKDIR_{PARENT,BODY} */
} ja_un;
};
#define ja_diradd ja_un.jau_diradd
#define ja_mkdir ja_un.jau_mkdir
#define ja_diroff ja_ref.if_diroff
#define ja_ino ja_ref.if_ino
#define ja_parent ja_ref.if_parent
#define ja_mode ja_ref.if_mode
/*
* A "jremref" structure tracks a removed reference (unlink) on an
* inode and prevents the directory remove from proceeding until the
* journal entry is written. Once the journal has been written the remove
* may proceed as normal.
*/
struct jremref {
struct inoref jr_ref; /* see inoref above. */
# define jr_list jr_ref.if_list /* Linked to softdep_journal_pending. */
# define jr_state jr_ref.if_list.wk_state
LIST_ENTRY(jremref) jr_deps; /* Links for dirrem. */
struct dirrem *jr_dirrem; /* Back pointer to dirrem. */
};
/*
* A "jmvref" structure tracks a name relocations within the same
* directory block that occur as a result of directory compaction.
* It prevents the updated directory entry from being written to disk
* until the journal entry is written. Once the journal has been
* written the compacted directory may be written to disk.
*/
struct jmvref {
struct worklist jm_list; /* Linked to softdep_journal_pending. */
LIST_ENTRY(jmvref) jm_deps; /* Jmvref on pagedep. */
struct pagedep *jm_pagedep; /* Back pointer to pagedep. */
ino_t jm_parent; /* Containing directory inode number. */
ino_t jm_ino; /* Inode number of our entry. */
off_t jm_oldoff; /* Our old offset in directory. */
off_t jm_newoff; /* Our new offset in directory. */
};
/*
* A "jnewblk" structure tracks a newly allocated block or fragment and
* prevents the direct or indirect block pointer as well as the cg bitmap
* from being written until it is logged. After it is logged the jsegdep
* is attached to the allocdirect or allocindir until the operation is
* completed or reverted. If the operation is reverted prior to the journal
* write the jnewblk structure is maintained to prevent the bitmaps from
* reaching the disk. Ultimately the jnewblk structure will be passed
* to the free routine as the in memory cg is modified back to the free
* state at which time it can be released. It may be held on any of the
* fx_jwork, fw_jwork, fb_jwork, ff_jwork, nb_jwork, or ir_jwork lists.
*/
struct jnewblk {
struct worklist jn_list; /* See lists above. */
# define jn_state jn_list.wk_state
struct jsegdep *jn_jsegdep; /* Will track our journal record. */
LIST_ENTRY(jnewblk) jn_deps; /* Jnewblks on sm_jnewblkhd. */
struct worklist *jn_dep; /* Dependency to ref completed seg. */
ufs_lbn_t jn_lbn; /* Lbn to which allocated. */
ufs2_daddr_t jn_blkno; /* Blkno allocated */
ino_t jn_ino; /* Ino to which allocated. */
int jn_oldfrags; /* Previous fragments when extended. */
int jn_frags; /* Number of fragments. */
};
/*
* A "jblkdep" structure tracks jfreeblk and jtrunc records attached to a
* freeblks structure.
*/
struct jblkdep {
struct worklist jb_list; /* For softdep journal pending. */
struct jsegdep *jb_jsegdep; /* Reference to the jseg. */
struct freeblks *jb_freeblks; /* Back pointer to freeblks. */
LIST_ENTRY(jblkdep) jb_deps; /* Dep list on freeblks. */
};
/*
* A "jfreeblk" structure tracks the journal write for freeing a block
* or tree of blocks. The block pointer must not be cleared in the inode
* or indirect prior to the jfreeblk being written to the journal.
*/
struct jfreeblk {
struct jblkdep jf_dep; /* freeblks linkage. */
ufs_lbn_t jf_lbn; /* Lbn from which blocks freed. */
ufs2_daddr_t jf_blkno; /* Blkno being freed. */
ino_t jf_ino; /* Ino from which blocks freed. */
int jf_frags; /* Number of frags being freed. */
};
/*
* A "jfreefrag" tracks the freeing of a single block when a fragment is
* extended or an indirect page is replaced. It is not part of a larger
* freeblks operation.
*/
struct jfreefrag {
struct worklist fr_list; /* Linked to softdep_journal_pending. */
# define fr_state fr_list.wk_state
struct jsegdep *fr_jsegdep; /* Will track our journal record. */
struct freefrag *fr_freefrag; /* Back pointer to freefrag. */
ufs_lbn_t fr_lbn; /* Lbn from which frag freed. */
ufs2_daddr_t fr_blkno; /* Blkno being freed. */
ino_t fr_ino; /* Ino from which frag freed. */
int fr_frags; /* Size of frag being freed. */
};
/*
* A "jtrunc" journals the intent to truncate an inode's data or extent area.
*/
struct jtrunc {
struct jblkdep jt_dep; /* freeblks linkage. */
off_t jt_size; /* Final file size. */
int jt_extsize; /* Final extent size. */
ino_t jt_ino; /* Ino being truncated. */
};
/*
* A "jfsync" journals the completion of an fsync which invalidates earlier
* jtrunc records in the journal.
*/
struct jfsync {
struct worklist jfs_list; /* For softdep journal pending. */
off_t jfs_size; /* Sync file size. */
int jfs_extsize; /* Sync extent size. */
ino_t jfs_ino; /* ino being synced. */
};
/*
* A "jsegdep" structure tracks a single reference to a written journal
* segment so the journal space can be reclaimed when all dependencies
* have been written. It can hang off of id_inowait, dm_jwork, da_jwork,
* nb_jwork, ff_jwork, or fb_jwork lists.
*/
struct jsegdep {
struct worklist jd_list; /* See above for lists. */
# define jd_state jd_list.wk_state
struct jseg *jd_seg; /* Our journal record. */
};
/*
* A "jseg" structure contains all of the journal records written in a
* single disk write. The jaddref and jremref structures are linked into
* js_entries so thay may be completed when the write completes. The
* js_entries also include the write dependency structures: jmvref,
* jnewblk, jfreeblk, jfreefrag, and jtrunc. The js_refs field counts
* the number of entries on the js_entries list. Thus there is a single
* jseg entry to describe each journal write.
*/
struct jseg {
struct worklist js_list; /* b_deps link for journal */
# define js_state js_list.wk_state
struct workhead js_entries; /* Entries awaiting write */
LIST_HEAD(, freework) js_indirs;/* List of indirects in this seg. */
TAILQ_ENTRY(jseg) js_next; /* List of all unfinished segments. */
struct jblocks *js_jblocks; /* Back pointer to block/seg list */
struct buf *js_buf; /* Buffer while unwritten */
uint64_t js_seq; /* Journal record sequence number. */
uint64_t js_oldseq; /* Oldest valid sequence number. */
int js_size; /* Size of journal record in bytes. */
int js_cnt; /* Total items allocated. */
int js_refs; /* Count of js_entries items. */
};
/*
* A 'sbdep' structure tracks the head of the free inode list and
* superblock writes. This makes sure the superblock is always pointing at
* the first possible unlinked inode for the suj recovery process. If a
* block write completes and we discover a new head is available the buf
* is dirtied and the dep is kept. See the description of the UNLINK*
* flags above for more details.
*/
struct sbdep {
struct worklist sb_list; /* b_dep linkage */
struct fs *sb_fs; /* Filesystem pointer within buf. */
struct ufsmount *sb_ump; /* Our mount structure */
};