File: [Development] / linux-2.6-xfs / fs / xfs / xfs_ialloc.c (download)
Revision 1.81, Thu Jun 8 18:35:44 1995 UTC (22 years, 4 months ago) by doucette
Branch: MAIN
Changes since 1.80: +9 -2
lines
Add inode readahead for bulkstat - changed xfs_iget interface.
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#ident "$Revision: 1.78 $"
#ifdef SIM
#define _KERNEL 1
#endif
#include <sys/param.h>
#include <sys/vnode.h>
#include <sys/buf.h>
#include <sys/uuid.h>
#include <sys/grio.h>
#ifdef SIM
#undef _KERNEL
#endif
#include <sys/stat.h>
#include <sys/debug.h>
#include <sys/errno.h>
#include <stddef.h>
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode_item.h"
#include "xfs_inode.h"
#include "xfs_alloc.h"
#include "xfs_bit.h"
#include "xfs_rtalloc.h"
#ifdef SIM
#include "sim.h"
#endif
/*
* Prototypes for internal routines.
*/
/*
* Log specified fields for the inode given by bp and off.
*/
STATIC void
xfs_ialloc_log_di(
xfs_trans_t *tp, /* transaction pointer */
buf_t *bp, /* inode buffer */
int off, /* index of inode in buffer */
int fields); /* bitmask of fields to log */
/*
* Prototypes for per-allocation group routines.
*/
/*
* Allocate new inodes in the allocation group specified by agbp.
* Return 0 for failure, 1 for success.
*/
STATIC int /* error */
xfs_ialloc_ag_alloc(
xfs_trans_t *tp, /* transaction pointer */
buf_t *agbp, /* alloc group buffer */
int *stat); /* success/failure */
/*
* Select an allocation group to look for a free inode in, based on the parent
* inode and then mode. Return the allocation group buffer.
*/
STATIC buf_t * /* allocation group buffer */
xfs_ialloc_ag_select(
xfs_trans_t *tp, /* transaction pointer */
xfs_ino_t parent, /* parent directory inode number */
mode_t mode); /* bits set to indicate file type */
/*
* Internal functions.
*/
/*
* Log specified fields for the inode given by bp and off.
*/
STATIC void
xfs_ialloc_log_di(
xfs_trans_t *tp, /* transaction pointer */
buf_t *bp, /* inode buffer */
int off, /* index of inode in buffer */
int fields) /* bitmask of fields to log */
{
xfs_dinode_t *dip; /* disk inode */
int first; /* first byte number */
int ioffset; /* off in bytes */
int last; /* last byte number */
xfs_mount_t *mp; /* mount point structure */
static const int offsets[] = { /* field offsets */
/* keep in sync with bits */
offsetof(xfs_dinode_core_t, di_magic),
offsetof(xfs_dinode_core_t, di_mode),
offsetof(xfs_dinode_core_t, di_version),
offsetof(xfs_dinode_core_t, di_format),
offsetof(xfs_dinode_core_t, di_nlink),
offsetof(xfs_dinode_core_t, di_uid),
offsetof(xfs_dinode_core_t, di_gid),
offsetof(xfs_dinode_core_t, di_uuid),
offsetof(xfs_dinode_core_t, di_atime),
offsetof(xfs_dinode_core_t, di_mtime),
offsetof(xfs_dinode_core_t, di_ctime),
offsetof(xfs_dinode_core_t, di_size),
offsetof(xfs_dinode_core_t, di_nblocks),
offsetof(xfs_dinode_core_t, di_extsize),
offsetof(xfs_dinode_core_t, di_nextents),
offsetof(xfs_dinode_core_t, di_anextents),
offsetof(xfs_dinode_core_t, di_forkoff),
offsetof(xfs_dinode_core_t, di_aformat),
offsetof(xfs_dinode_core_t, di_dmevmask),
offsetof(xfs_dinode_core_t, di_dmstate),
offsetof(xfs_dinode_core_t, di_flags),
offsetof(xfs_dinode_core_t, di_gen),
offsetof(xfs_dinode_t, di_next_unlinked),
offsetof(xfs_dinode_t, di_u),
offsetof(xfs_dinode_t, di_a),
sizeof(xfs_dinode_t)
};
ASSERT(offsetof(xfs_dinode_t, di_core) == 0);
ASSERT((fields & (XFS_DI_U|XFS_DI_A)) == 0);
mp = tp->t_mountp;
/*
* Get the inode-relative first and last bytes for these fields
*/
xfs_btree_offsets(fields, offsets, XFS_DI_NUM_BITS, &first, &last);
/*
* Convert to buffer offsets and log it.
*/
dip = XFS_MAKE_IPTR(mp, bp, off);
ioffset = (caddr_t)dip - (caddr_t)XFS_BUF_TO_DINODE(bp);
first += ioffset;
last += ioffset;
xfs_trans_log_buf(tp, bp, first, last);
}
/*
* Allocation group level functions.
*/
/*
* Allocate new inodes in the allocation group specified by agbp.
* Return 0 for failure, 1 for success.
*/
STATIC int /* success/failure */
xfs_ialloc_ag_alloc(
xfs_trans_t *tp, /* transaction pointer */
buf_t *agbp, /* alloc group buffer */
int *alloc)
{
xfs_agi_t *agi; /* allocation group header */
xfs_alloc_arg_t args; /* allocation argument structure */
int blks_per_cluster; /* fs blocks per inode cluster */
xfs_btree_cur_t *cur; /* inode btree cursor */
daddr_t d; /* disk addr of buffer */
int error;
buf_t *fbuf; /* new free inodes' buffer */
xfs_dinode_t *free; /* new free inode structure */
int i; /* inode counter */
int j; /* block counter */
int nbufs; /* num bufs of new inodes */
xfs_agino_t newino; /* new first inode's number */
xfs_agino_t newlen; /* new number of inodes */
int ninodes; /* num inodes per buf */
xfs_agino_t thisino; /* current inode number, for loop */
static xfs_timestamp_t ztime; /* zero xfs timestamp */
static uuid_t zuuid; /* zero uuid */
args.tp = tp;
args.mp = tp->t_mountp;
agi = XFS_BUF_TO_AGI(agbp);
/*
* Locking will ensure that we don't have two callers in here
* at one time.
*/
newlen = XFS_IALLOC_INODES(args.mp);
args.minlen = args.maxlen = XFS_IALLOC_BLOCKS(args.mp);
/*
* Need to figure out where to allocate the inode blocks.
* Ideally they should be spaced out through the a.g.
* For now, just allocate blocks up front.
*/
args.agbno = agi->agi_root;
args.fsbno = XFS_AGB_TO_FSB(args.mp, agi->agi_seqno, args.agbno);
/*
* Allocate a fixed-size extent of inodes.
*/
args.type = XFS_ALLOCTYPE_NEAR_BNO;
args.mod = args.total = args.wasdel = args.isfl = args.userdata = 0;
args.prod = 1;
/*
* Allow space for the inode btree to split.
*/
args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
error = xfs_alloc_vextent(&args);
if (error) {
return error;
}
if (args.fsbno == NULLFSBLOCK) {
*alloc = 0;
return 0;
}
ASSERT(args.len == args.minlen);
/*
* Convert the results.
*/
newino = XFS_OFFBNO_TO_AGINO(args.mp, args.agbno, 0);
/*
* Loop over the new block(s), filling in the inodes.
* For small block sizes, manipulate the inodes in buffers
* which are multiples of the blocks size.
*/
if (args.mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE) {
blks_per_cluster = 1;
nbufs = (int)args.len;
ninodes = args.mp->m_sb.sb_inopblock;
} else {
blks_per_cluster = XFS_INODE_CLUSTER_SIZE /
args.mp->m_sb.sb_blocksize;
nbufs = (int)args.len / blks_per_cluster;
ninodes = blks_per_cluster * args.mp->m_sb.sb_inopblock;
}
for (j = 0; j < nbufs; j++) {
/*
* Get the block.
*/
d = XFS_AGB_TO_DADDR(args.mp, agi->agi_seqno,
args.agbno + (j * blks_per_cluster));
fbuf = xfs_trans_get_buf(tp, args.mp->m_dev, d,
args.mp->m_bsize * blks_per_cluster,
0);
ASSERT(fbuf);
ASSERT(!geterror(fbuf));
/*
* Loop over the inodes in this buffer.
*/
for (i = 0; i < ninodes; i++) {
free = XFS_MAKE_IPTR(args.mp, fbuf, i);
free->di_core.di_magic = XFS_DINODE_MAGIC;
free->di_core.di_mode = 0;
free->di_core.di_version = XFS_DINODE_VERSION;
free->di_core.di_format = 0;
free->di_core.di_nlink = 0;
free->di_core.di_uid = 0;
free->di_core.di_gid = 0;
free->di_core.di_uuid = zuuid;
free->di_core.di_atime = ztime;
free->di_core.di_mtime = ztime;
free->di_core.di_ctime = ztime;
free->di_core.di_size = 0;
free->di_core.di_nblocks = 0;
free->di_core.di_extsize = 0;
free->di_core.di_nextents = 0;
free->di_core.di_anextents = 0;
free->di_core.di_forkoff = 0;
free->di_core.di_aformat = 0;
free->di_core.di_dmevmask = 0;
free->di_core.di_dmstate = 0;
free->di_core.di_flags = 0;
free->di_core.di_gen = 0;
free->di_next_unlinked = NULLAGINO;
xfs_ialloc_log_di(tp, fbuf, i,
XFS_DI_CORE_BITS | XFS_DI_NEXT_UNLINKED);
}
xfs_trans_inode_alloc_buf(tp, fbuf);
}
agi->agi_count += newlen;
agi->agi_freecount += newlen;
mrlock(&args.mp->m_peraglock, MR_ACCESS, PINOD);
args.mp->m_perag[agi->agi_seqno].pagi_freecount += newlen;
mrunlock(&args.mp->m_peraglock);
agi->agi_newino = newino;
/*
* Insert records describing the new inode chunk into the btree.
*/
cur = xfs_btree_init_cursor(args.mp, tp, agbp, agi->agi_seqno,
XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
for (thisino = newino;
thisino < newino + newlen;
thisino += XFS_INODES_PER_CHUNK) {
error = xfs_inobt_lookup_eq(cur, thisino, XFS_INODES_PER_CHUNK,
XFS_INOBT_ALL_FREE, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
ASSERT(i == 0);
error = xfs_inobt_insert(cur, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
ASSERT(i == 1);
}
xfs_btree_del_cursor(cur);
/*
* Log allocation group header fields
*/
xfs_ialloc_log_agi(tp, agbp,
XFS_AGI_COUNT | XFS_AGI_FREECOUNT | XFS_AGI_NEWINO);
/*
* Modify/log superblock values for inode count and inode free count.
*/
xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, newlen);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, newlen);
*alloc = 1;
return 0;
}
/*
* Select an allocation group to look for a free inode in, based on the parent
* inode and then mode. Return the allocation group buffer.
*/
STATIC buf_t * /* allocation group buffer */
xfs_ialloc_ag_select(
xfs_trans_t *tp, /* transaction pointer */
xfs_ino_t parent, /* parent directory inode number */
mode_t mode) /* bits set to indicate file type */
{
buf_t *agbp; /* allocation group header buffer */
xfs_agnumber_t agcount; /* number of ag's in the filesystem */
xfs_agnumber_t agno; /* current ag number */
int error;
int flags; /* alloc buffer locking flags */
xfs_extlen_t ineed; /* blocks needed for inode allocation */
xfs_extlen_t longest; /* longest extent available */
xfs_mount_t *mp; /* mount point structure */
int needspace; /* file mode implies space allocated */
xfs_perag_t *pag; /* per allocation group data */
xfs_agnumber_t pagno; /* parent (starting) ag number */
/*
* Files of these types need at least one block if length > 0
* (and they won't fit in the inode, but that's hard to figure out).
*/
needspace = S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode);
mp = tp->t_mountp;
if (S_ISDIR(mode))
pagno = mp->m_agirotor;
else
pagno = XFS_INO_TO_AGNO(mp, parent);
agcount = mp->m_sb.sb_agcount;
ASSERT(pagno < agcount);
/*
* Loop through allocation groups, looking for one with a little
* free space in it. Note we don't look for free inodes, exactly.
* Instead, we include whether there is a need to allocate inodes
* to mean that blocks must be allocated for them,
* if none are currently free.
*/
agno = pagno;
flags = XFS_ALLOC_FLAG_TRYLOCK;
for (;;) {
mrlock(&mp->m_peraglock, MR_ACCESS, PINOD);
pag = &mp->m_perag[agno];
if (!pag->pagi_init) {
error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
if (error) {
agbp = NULL;
mrunlock(&mp->m_peraglock);
goto nextag;
}
} else {
agbp = NULL;
}
if (!pag->pagf_init) {
if (agbp == NULL) {
error = xfs_ialloc_read_agi(mp, tp, agno,
&agbp);
if (error) {
agbp = NULL;
mrunlock(&mp->m_peraglock);
goto nextag;
}
}
(void) xfs_alloc_pagf_init(mp, tp, agno, flags);
}
/*
* Is there enough free space for the file plus a block
* of inodes (if we need to allocate some)?
*/
ineed = pag->pagi_freecount ? 0 : XFS_IALLOC_BLOCKS(mp);
if (pag->pagf_init) {
if (!(longest = pag->pagf_longest))
longest = pag->pagf_flcount > 0;
if (pag->pagf_freeblks >= needspace + ineed &&
longest >= ineed) {
if (agbp == NULL) {
error = xfs_ialloc_read_agi(mp, tp,
agno, &agbp);
if (error) {
agbp = NULL;
mrunlock(&mp->m_peraglock);
goto nextag;
}
}
mrunlock(&mp->m_peraglock);
if (S_ISDIR(mode))
mp->m_agirotor =
(agno + 1 == agcount) ?
0 : (agno + 1);
return agbp;
}
}
mrunlock(&mp->m_peraglock);
if (agbp)
xfs_trans_brelse(tp, agbp);
nextag:
agno++;
if (agno == agcount)
agno = 0;
if (agno == pagno)
if (flags)
flags = 0;
else
return (buf_t *)0;
}
}
/*
* Visible inode allocation functions.
*/
/*
* Allocate an inode on disk.
* Mode is used to tell whether the new inode will need space, and whether
* it is a directory.
*
* The arguments IO_agbp and alloc_done are defined to work within
* the constraint of one allocation per transaction.
* xfs_dialloc() is designed to be called twice if it has to do an
* allocation to make more free inodes. On the first call,
* IO_agbp should be set to NULL. If an inode is available,
* i.e., xfs_dialloc() did not need to do an allocation, an inode
* number is returned. In this case, IO_agbp would be set to the
* current ag_buf and alloc_done set to false.
* If an allocation needed to be done, xfs_dialloc would return
* the current ag_buf in IO_agbp and set alloc_done to true.
* The caller should then commit the current transaction, allocate a new
* transaction, and call xfs_dialloc() again, passing in the previous
* value of IO_agbp. IO_agbp should be held across the transactions.
* Since the agbp is locked across the two calls, the second call is
* guaranteed to have a free inode available.
*
* Once we successfully pick an inode its number is returned and the
* on-disk data structures are updated. The inode itself is not read
* in, since doing so would break ordering constraints with xfs_reclaim.
*/
int
xfs_dialloc(
xfs_trans_t *tp, /* transaction pointer */
xfs_ino_t parent, /* parent inode (directory) */
mode_t mode, /* mode bits for new inode */
buf_t **IO_agbp, /* in/out ag header's buffer */
boolean_t *alloc_done, /* true if we needed to replenish
inode freelist */
xfs_ino_t *inop) /* inode number allocated */
{
xfs_agnumber_t agcount; /* number of allocation groups */
buf_t *agbp; /* allocation group header's buffer */
xfs_agnumber_t agno; /* allocation group number */
xfs_agi_t *agi; /* allocation group header structure */
xfs_btree_cur_t *cur; /* inode allocation btree cursor */
int i; /* result code */
int ialloced; /* inode allocation status */
xfs_ino_t ino; /* fs-relative inode to be returned */
int j; /* result code */
xfs_mount_t *mp; /* file system mount structure */
int offset; /* index of inode in chunk */
xfs_agino_t pagino; /* parent's a.g. relative inode # */
xfs_agnumber_t pagno; /* parent's allocation group number */
xfs_inobt_rec_t rec; /* inode allocation record */
xfs_agnumber_t tagno; /* testing allocation group number */
xfs_btree_cur_t *tcur; /* temp cursor */
xfs_inobt_rec_t trec; /* temp inode allocation record */
int error;
if (*IO_agbp == NULL) {
/*
* We do not have an agbp, so select an initial allocation
* group for inode allocation.
*/
agbp = xfs_ialloc_ag_select(tp, parent, mode);
/*
* Couldn't find an allocation group satisfying the
* criteria, give up.
*/
if (!agbp) {
*inop = NULLFSINO;
return 0;
}
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(agi->agi_magicnum == XFS_AGI_MAGIC);
} else {
/*
* Continue where we left off before. In this case, we
* know that the allocation group has free inodes.
*/
agbp = *IO_agbp;
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(agi->agi_magicnum == XFS_AGI_MAGIC);
ASSERT(agi->agi_freecount > 0);
}
mp = tp->t_mountp;
agcount = mp->m_sb.sb_agcount;
agno = agi->agi_seqno;
tagno = agno;
pagno = XFS_INO_TO_AGNO(mp, parent);
pagino = XFS_INO_TO_AGINO(mp, parent);
/*
* Loop until we find an allocation group that either has free inodes
* or in which we can allocate some inodes. Iterate through the
* allocation groups upward, wrapping at the end.
*/
*alloc_done = B_FALSE;
while (agi->agi_freecount == 0) {
/*
* Try to allocate some new inodes in the allocation group.
*/
error = xfs_ialloc_ag_alloc(tp, agbp, &ialloced);
if (error) {
return error;
}
if (ialloced) {
/*
* We successfully allocated some inodes, return
* the current context to the caller so that it
* can commit the current transaction and call
* us again where we left off.
*/
ASSERT(agi->agi_freecount > 0);
*alloc_done = B_TRUE;
*IO_agbp = agbp;
*inop = NULLFSINO;
return 0;
}
/*
* If it failed, give up on this ag.
*/
xfs_trans_brelse(tp, agbp);
/*
* Go on to the next ag: get its ag header.
*/
nextag:
if (++tagno == agcount)
tagno = 0;
if (tagno == agno) {
*inop = NULLFSINO;
return 0;
}
mrlock(&mp->m_peraglock, MR_ACCESS, PINOD);
error = xfs_ialloc_read_agi(mp, tp, tagno, &agbp);
mrunlock(&mp->m_peraglock);
if (error) {
goto nextag;
}
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(agi->agi_magicnum == XFS_AGI_MAGIC);
}
/*
* Here with an allocation group that has a free inode.
* Reset agno since we may have chosen a new ag in the
* loop above.
*/
agno = tagno;
*IO_agbp = NULL;
cur = xfs_btree_init_cursor(mp, tp, agbp, agi->agi_seqno,
XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
/*
* If pagino is 0 (this is the root inode allocation) use newino.
* This must work because we've just allocated some.
*/
if (!pagino)
pagino = agi->agi_newino;
#ifdef DEBUG
if (cur->bc_nlevels == 1) {
int freecount = 0;
error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
while (xfs_inobt_get_rec(cur, &rec.ir_startino, &rec.ir_freecount, &rec.ir_free)) {
freecount += rec.ir_freecount;
error = xfs_inobt_increment(cur, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
}
ASSERT(freecount == agi->agi_freecount);
}
#endif
/*
* If in the same a.g. as the parent, try to get near the parent.
*/
if (pagno == agno) {
error = xfs_inobt_lookup_le(cur, pagino, 0, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
if ((i != 0) &&
(j = xfs_inobt_get_rec(cur, &rec.ir_startino,
&rec.ir_freecount, &rec.ir_free)) &&
rec.ir_freecount > 0) {
/*
* Found a free inode in the same chunk
* as parent, done.
*/
}
/*
* In the same a.g. as parent, but parent's chunk is full.
*/
else {
int doneleft; /* done, to the left */
int doneright; /* done, to the right */
ASSERT(i == 1);
ASSERT(j == 1);
/*
* Duplicate the cursor, search left & right
* simultaneously.
*/
tcur = xfs_btree_dup_cursor(cur);
/*
* Search left with tcur, back up 1 record.
*/
error = xfs_inobt_decrement(tcur, 0, &i);
if (error) {
xfs_btree_del_cursor(tcur);
xfs_btree_del_cursor(cur);
return error;
}
doneleft = !i;
if (!doneleft) {
i = xfs_inobt_get_rec(tcur, &trec.ir_startino,
&trec.ir_freecount,
&trec.ir_free);
ASSERT(i);
}
/*
* Search right with cur, go forward 1 record.
*/
error = xfs_inobt_increment(cur, 0, &i);
if (error) {
xfs_btree_del_cursor(tcur);
xfs_btree_del_cursor(cur);
return error;
}
doneright = !i;
if (!doneright) {
i = xfs_inobt_get_rec(cur, &rec.ir_startino,
&rec.ir_freecount,
&rec.ir_free);
ASSERT(i);
}
/*
* Loop until we find the closest inode chunk
* with a free one.
*/
while (!doneleft || !doneright) {
int useleft; /* using left inode
chunk this time */
/*
* Figure out which block is closer,
* if both are valid.
*/
if (!doneleft && !doneright)
useleft =
pagino -
(trec.ir_startino +
XFS_INODES_PER_CHUNK - 1) <
rec.ir_startino - pagino;
else
useleft = !doneleft;
/*
* If checking the left, does it have
* free inodes?
*/
if (useleft && trec.ir_freecount) {
/*
* Yes, set it up as the chunk to use.
*/
rec = trec;
xfs_btree_del_cursor(cur);
cur = tcur;
break;
}
/*
* If checking the right, does it have
* free inodes?
*/
if (!useleft && rec.ir_freecount) {
/*
* Yes, it's already set up.
*/
xfs_btree_del_cursor(tcur);
break;
}
/*
* If used the left, get another one
* further left.
*/
if (useleft) {
error = xfs_inobt_decrement(tcur, 0,
&i);
if (error) {
xfs_btree_del_cursor(tcur);
xfs_btree_del_cursor(cur);
return error;
}
doneleft = !i;
if (!doneleft) {
i = xfs_inobt_get_rec(tcur,
&trec.ir_startino,
&trec.ir_freecount,
&trec.ir_free);
ASSERT(i);
}
}
/*
* If used the right, get another one
* further right.
*/
else {
error = xfs_inobt_increment(cur, 0,
&i);
if (error) {
xfs_btree_del_cursor(tcur);
xfs_btree_del_cursor(cur);
return error;
}
doneright = !i;
if (!doneright) {
i = xfs_inobt_get_rec(cur,
&rec.ir_startino,
&rec.ir_freecount,
&rec.ir_free);
ASSERT(i);
}
}
}
ASSERT(!doneleft || !doneright);
}
}
/*
* In a different a.g. from the parent.
* See if the most recently allocated block has any free.
*/
else if (agi->agi_newino != NULLAGINO) {
error = xfs_inobt_lookup_eq(cur, agi->agi_newino, 0, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
if ((i != 0) &&
xfs_inobt_get_rec(cur, &rec.ir_startino,
&rec.ir_freecount, &rec.ir_free) &&
rec.ir_freecount > 0) {
/*
* The last chunk allocated in the group still has
* a free inode.
*/
}
/*
* None left in the last group, search the whole a.g.
*/
else {
error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
ASSERT(i == 1);
for (;;) {
i = xfs_inobt_get_rec(cur, &rec.ir_startino,
&rec.ir_freecount, &rec.ir_free);
ASSERT(i == 1);
if (rec.ir_freecount > 0)
break;
error = xfs_inobt_increment(cur, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
ASSERT(i == 1);
}
}
}
offset = XFS_IALLOC_FIND_FREE(&rec.ir_free);
ASSERT(offset >= 0);
ASSERT(offset < XFS_INODES_PER_CHUNK);
ASSERT((XFS_AGINO_TO_OFFSET(mp, rec.ir_startino) %
XFS_INODES_PER_CHUNK) == 0);
ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino + offset);
XFS_INOBT_CLR_FREE(&rec, offset);
rec.ir_freecount--;
xfs_inobt_update(cur, rec.ir_startino, rec.ir_freecount, rec.ir_free);
agi->agi_freecount--;
mrlock(&mp->m_peraglock, MR_ACCESS, PINOD);
mp->m_perag[tagno].pagi_freecount--;
mrunlock(&mp->m_peraglock);
#ifdef DEBUG
if (cur->bc_nlevels == 1) {
int freecount = 0;
error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
while (xfs_inobt_get_rec(cur, &rec.ir_startino, &rec.ir_freecount, &rec.ir_free)) {
freecount += rec.ir_freecount;
error = xfs_inobt_increment(cur, 0, &i);
if (error) {
xfs_btree_del_cursor(cur);
return error;
}
}
ASSERT(freecount == agi->agi_freecount);
}
#endif
xfs_btree_del_cursor(cur);
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
*inop = ino;
return 0;
}
#ifndef SIM
/*
* Free disk inode. Carefully avoids touching the incore inode, all
* manipulations incore are the caller's responsibility.
* The on-disk inode is not changed by this operation, only the
* btree (free inode mask) is changed.
*/
int
xfs_difree(
xfs_trans_t *tp, /* transaction pointer */
xfs_ino_t inode) /* inode to be freed */
{
xfs_agblock_t agbno; /* block number containing inode */
buf_t *agbp; /* buffer containing allocation group header */
xfs_agino_t agino; /* inode number relative to allocation group */
xfs_agnumber_t agno; /* allocation group number */
xfs_agi_t *agi; /* allocation group header */
xfs_btree_cur_t *cur; /* inode btree cursor */
int error;
int i; /* result code */
xfs_mount_t *mp; /* mount structure for filesystem */
int off; /* offset of inode in inode chunk */
xfs_inobt_rec_t rec; /* btree record */
mp = tp->t_mountp;
/*
* Break up inode number into its components.
*/
agno = XFS_INO_TO_AGNO(mp, inode);
ASSERT(agno < mp->m_sb.sb_agcount);
agino = XFS_INO_TO_AGINO(mp, inode);
ASSERT(agino != NULLAGINO);
agbno = XFS_AGINO_TO_AGBNO(mp, agino);
/*
* Get the allocation group header.
*/
mrlock(&mp->m_peraglock, MR_ACCESS, PINOD);
error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
mrunlock(&mp->m_peraglock);
if (error) {
return error;
}
agi = XFS_BUF_TO_AGI(agbp);
ASSERT(agi->agi_magicnum == XFS_AGI_MAGIC);
ASSERT(agbno < agi->agi_length);
/*
* Initialize the cursor.
*/
cur = xfs_btree_init_cursor(mp, tp, agbp, agno, XFS_BTNUM_INO,
(xfs_inode_t *)0, 0);
#ifdef DEBUG
if (cur->bc_nlevels == 1) {
int freecount = 0;
error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i);
if (error) {
goto error0;
}
while (xfs_inobt_get_rec(cur, &rec.ir_startino, &rec.ir_freecount, &rec.ir_free)) {
freecount += rec.ir_freecount;
error = xfs_inobt_increment(cur, 0, &i);
if (error) {
goto error0;
}
}
ASSERT(freecount == agi->agi_freecount);
}
#endif
/*
* Look for the entry describing this inode.
*/
error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i);
if (error) {
goto error0;
}
ASSERT(i == 1);
i = xfs_inobt_get_rec(cur, &rec.ir_startino, &rec.ir_freecount,
&rec.ir_free);
ASSERT(i == 1);
/*
* Get the offset in the inode chunk.
*/
off = agino - rec.ir_startino;
ASSERT(off >= 0 && off < XFS_INODES_PER_CHUNK);
ASSERT(!XFS_INOBT_IS_FREE(&rec, off));
/*
* Mark the inode free & increment the count.
*/
XFS_INOBT_SET_FREE(&rec, off);
rec.ir_freecount++;
i = xfs_inobt_update(cur, rec.ir_startino, rec.ir_freecount,
rec.ir_free);
ASSERT(i == 1);
/*
* Change the inode free counts and log the ag/sb changes.
*/
agi->agi_freecount++;
mrlock(&mp->m_peraglock, MR_ACCESS, PINOD);
mp->m_perag[agno].pagi_freecount++;
mrunlock(&mp->m_peraglock);
#ifdef DEBUG
if (cur->bc_nlevels == 1) {
int freecount = 0;
error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &i);
if (error) {
goto error0;
}
while (xfs_inobt_get_rec(cur, &rec.ir_startino, &rec.ir_freecount, &rec.ir_free)) {
freecount += rec.ir_freecount;
error = xfs_inobt_increment(cur, 0, &i);
if (error) {
goto error0;
}
}
ASSERT(freecount == agi->agi_freecount);
}
#endif
xfs_btree_del_cursor(cur);
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1);
return 0;
error0:
xfs_btree_del_cursor(cur);
return error;
}
#endif /* !SIM */
/*
* Return the location of the inode in bno/off, for mapping it into a buffer.
*/
/*ARGSUSED*/
int
xfs_dilocate(
xfs_mount_t *mp, /* file system mount structure */
xfs_trans_t *tp, /* transaction pointer */
xfs_ino_t ino, /* inode to locate */
xfs_fsblock_t *bno, /* output: block containing inode */
int *len, /* output: num blocks in inode cluster */
int *off, /* output: index in block of inode */
uint flags) /* flags concerning inode lookup */
{
xfs_agblock_t agbno; /* block number of inode in the alloc group */
buf_t *agbp; /* agi buffer */
xfs_agino_t agino; /* inode number within alloc group */
xfs_agnumber_t agno; /* allocation group number */
int blks_per_cluster; /* num blocks per inode cluster */
xfs_agblock_t chunk_agbno; /* first block in inode chunk */
xfs_agino_t chunk_agino; /* first agino in inode chunk */
__int32_t chunk_cnt; /* count of free inodes in chunk */
xfs_inofree_t chunk_free; /* mask of free inodes in chunk */
xfs_agblock_t cluster_agbno; /* first block in inode cluster */
xfs_btree_cur_t *cur; /* inode btree cursor */
int error; /* error code */
int i; /* temp state */
int offset; /* index of inode in its buffer */
int offset_agbno; /* blks from chunk start to inode */
ASSERT(ino != NULLFSINO);
/*
* Split up the inode number into its parts.
*/
agno = XFS_INO_TO_AGNO(mp, ino);
ASSERT(agno < mp->m_sb.sb_agcount);
agbno = XFS_INO_TO_AGBNO(mp, ino);
ASSERT(agbno < mp->m_sb.sb_agblocks);
if ((agno >= mp->m_sb.sb_agcount) ||
(agbno >= mp->m_sb.sb_agblocks)) {
return EINVAL;
}
error = 0;
if ((mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE) ||
!(flags & XFS_IMAP_LOOKUP)) {
offset = XFS_INO_TO_OFFSET(mp, ino);
ASSERT(offset < mp->m_sb.sb_inopblock);
*bno = XFS_AGB_TO_FSB(mp, agno, agbno);
*off = offset;
*len = 1;
} else if (*bno != NULLFSBLOCK) {
offset = XFS_INO_TO_OFFSET(mp, ino);
ASSERT(offset < mp->m_sb.sb_inopblock);
cluster_agbno = XFS_FSB_TO_AGBNO(mp, *bno);
*off = ((agbno - cluster_agbno) * mp->m_sb.sb_inopblock) +
offset;
*len = XFS_INODE_CLUSTER_SIZE >> mp->m_sb.sb_blocklog;
} else {
agino = XFS_INO_TO_AGINO(mp, ino);
mrlock(&mp->m_peraglock, MR_ACCESS, PINOD);
error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
mrunlock(&mp->m_peraglock);
if (error) {
return error;
}
cur = xfs_btree_init_cursor(mp, tp, agbp, agno,
XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
error = xfs_inobt_lookup_le(cur, agino, 0, 0, &i);
if (error) {
xfs_trans_brelse(tp, agbp);
xfs_btree_del_cursor(cur);
return error;
}
if (!xfs_inobt_get_rec(cur, &chunk_agino, &chunk_cnt,
&chunk_free)) {
error = EINVAL;
} else {
chunk_agbno = XFS_AGINO_TO_AGBNO(mp, chunk_agino);
ASSERT(agbno >= chunk_agbno);
offset_agbno = agbno - chunk_agbno;
blks_per_cluster = XFS_INODE_CLUSTER_SIZE >>
mp->m_sb.sb_blocklog;
cluster_agbno = chunk_agbno +
((offset_agbno / blks_per_cluster) *
blks_per_cluster);
offset = ((agbno - cluster_agbno) *
mp->m_sb.sb_inopblock) +
XFS_INO_TO_OFFSET(mp, ino);
*bno = XFS_AGB_TO_FSB(mp, agno, cluster_agbno);
*off = offset;
*len = blks_per_cluster;
}
xfs_trans_brelse(tp, agbp);
xfs_btree_del_cursor(cur);
}
return error;
}
/*
* Compute and fill in value of m_in_maxlevels.
*/
void
xfs_ialloc_compute_maxlevels(
xfs_mount_t *mp) /* file system mount structure */
{
int level;
uint maxblocks;
uint maxleafents;
int minleafrecs;
int minnoderecs;
maxleafents = (1LL << XFS_INO_AGINO_BITS(mp)) >>
XFS_INODES_PER_CHUNK_LOG;
minleafrecs = mp->m_alloc_mnr[0];
minnoderecs = mp->m_alloc_mnr[1];
maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
for (level = 1; maxblocks > 1; level++)
maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
mp->m_in_maxlevels = level;
}
/*
* Log specified fields for the ag hdr (inode section)
*/
void
xfs_ialloc_log_agi(
xfs_trans_t *tp, /* transaction pointer */
buf_t *bp, /* allocation group header buffer */
int fields) /* bitmask of fields to log */
{
int first; /* first byte number */
int last; /* last byte number */
static const int offsets[] = { /* field starting offsets */
/* keep in sync with bit definitions */
offsetof(xfs_agi_t, agi_magicnum),
offsetof(xfs_agi_t, agi_versionnum),
offsetof(xfs_agi_t, agi_seqno),
offsetof(xfs_agi_t, agi_length),
offsetof(xfs_agi_t, agi_count),
offsetof(xfs_agi_t, agi_root),
offsetof(xfs_agi_t, agi_level),
offsetof(xfs_agi_t, agi_freecount),
offsetof(xfs_agi_t, agi_newino),
offsetof(xfs_agi_t, agi_dirino),
offsetof(xfs_agi_t, agi_unlinked),
sizeof(xfs_agi_t)
};
#ifdef DEBUG
xfs_agi_t *agi; /* allocation group header */
agi = XFS_BUF_TO_AGI(bp);
ASSERT(agi->agi_magicnum == XFS_AGI_MAGIC);
#endif
/*
* Compute byte offsets for the first and last fields.
*/
xfs_btree_offsets(fields, offsets, XFS_AGI_NUM_BITS, &first, &last);
/*
* Log the allocation group inode header buffer.
*/
xfs_trans_log_buf(tp, bp, first, last);
}
/*
* Read in the allocation group header (inode allocation section)
*/
int
xfs_ialloc_read_agi(
xfs_mount_t *mp, /* file system mount structure */
xfs_trans_t *tp, /* transaction pointer */
xfs_agnumber_t agno, /* allocation group number */
buf_t **bpp) /* allocation group hdr buf */
{
xfs_agi_t *agi; /* allocation group header */
buf_t *bp; /* allocation group hdr buf */
daddr_t d; /* disk block address */
int error;
#ifdef DEBUG
int i;
#endif
xfs_perag_t *pag; /* per allocation group data */
ASSERT(agno != NULLAGNUMBER);
d = XFS_AG_DADDR(mp, agno, XFS_AGI_DADDR);
error = xfs_trans_read_buf(tp, mp->m_dev, d, 1, 0, &bp);
if (error) {
return error;
}
ASSERT(bp && !geterror(bp));
/*
* Validate the magic number of the agi block.
*/
agi = XFS_BUF_TO_AGI(bp);
if ((agi->agi_magicnum != XFS_AGI_MAGIC) ||
(agi->agi_versionnum != XFS_AGI_VERSION)) {
bp->b_flags |= B_ERROR;
xfs_trans_brelse(tp, bp);
return EIO;
}
pag = &mp->m_perag[agno];
if (!pag->pagi_init) {
pag->pagi_freecount = agi->agi_freecount;
pag->pagi_init = 1;
} else
ASSERT(pag->pagi_freecount == agi->agi_freecount);
#ifdef DEBUG
for (i = 0; i < XFS_AGI_UNLINKED_BUCKETS; i++)
ASSERT(agi->agi_unlinked[i] != 0);
#endif
bp->b_ref = XFS_AGI_REF;
*bpp = bp;
return 0;
}
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