forked from Minki/linux
xfs: factor out inode initialisation
Factor out code to initialize new inode clusters into a function of it's own. This keeps xfs_ialloc_ag_alloc smaller and better structured and enables a future inode cluster initialization transaction. Also initialize the agno variable earlier in xfs_ialloc_ag_alloc to avoid repeated byte swaps. [hch: The original patch is from Dave from his unpublished inode create transaction patch series, with some modifcations by me to apply stand-alone] Signed-off-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Alex Elder <aelder@sgi.com> Signed-off-by: Felix Blyakher <felixb@sgi.com>
This commit is contained in:
Dave Chinner
Felix Blyakher
parent
1da1daed81
commit
85c0b2ab5e
@ -152,6 +152,87 @@ xfs_inobt_get_rec(
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialise a new set of inodes.
|
||||
*/
|
||||
STATIC void
|
||||
xfs_ialloc_inode_init(
|
||||
struct xfs_mount *mp,
|
||||
struct xfs_trans *tp,
|
||||
xfs_agnumber_t agno,
|
||||
xfs_agblock_t agbno,
|
||||
xfs_agblock_t length,
|
||||
unsigned int gen)
|
||||
{
|
||||
struct xfs_buf *fbuf;
|
||||
struct xfs_dinode *free;
|
||||
int blks_per_cluster, nbufs, ninodes;
|
||||
int version;
|
||||
int i, j;
|
||||
xfs_daddr_t d;
|
||||
|
||||
/*
|
||||
* 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 (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) {
|
||||
blks_per_cluster = 1;
|
||||
nbufs = length;
|
||||
ninodes = mp->m_sb.sb_inopblock;
|
||||
} else {
|
||||
blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) /
|
||||
mp->m_sb.sb_blocksize;
|
||||
nbufs = length / blks_per_cluster;
|
||||
ninodes = blks_per_cluster * mp->m_sb.sb_inopblock;
|
||||
}
|
||||
|
||||
/*
|
||||
* Figure out what version number to use in the inodes we create.
|
||||
* If the superblock version has caught up to the one that supports
|
||||
* the new inode format, then use the new inode version. Otherwise
|
||||
* use the old version so that old kernels will continue to be
|
||||
* able to use the file system.
|
||||
*/
|
||||
if (xfs_sb_version_hasnlink(&mp->m_sb))
|
||||
version = 2;
|
||||
else
|
||||
version = 1;
|
||||
|
||||
for (j = 0; j < nbufs; j++) {
|
||||
/*
|
||||
* Get the block.
|
||||
*/
|
||||
d = XFS_AGB_TO_DADDR(mp, agno, agbno + (j * blks_per_cluster));
|
||||
fbuf = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
|
||||
mp->m_bsize * blks_per_cluster,
|
||||
XFS_BUF_LOCK);
|
||||
ASSERT(fbuf);
|
||||
ASSERT(!XFS_BUF_GETERROR(fbuf));
|
||||
|
||||
/*
|
||||
* Initialize all inodes in this buffer and then log them.
|
||||
*
|
||||
* XXX: It would be much better if we had just one transaction
|
||||
* to log a whole cluster of inodes instead of all the
|
||||
* individual transactions causing a lot of log traffic.
|
||||
*/
|
||||
xfs_biozero(fbuf, 0, ninodes << mp->m_sb.sb_inodelog);
|
||||
for (i = 0; i < ninodes; i++) {
|
||||
int ioffset = i << mp->m_sb.sb_inodelog;
|
||||
uint isize = sizeof(struct xfs_dinode);
|
||||
|
||||
free = xfs_make_iptr(mp, fbuf, i);
|
||||
free->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
|
||||
free->di_version = version;
|
||||
free->di_gen = cpu_to_be32(gen);
|
||||
free->di_next_unlinked = cpu_to_be32(NULLAGINO);
|
||||
xfs_trans_log_buf(tp, fbuf, ioffset, ioffset + isize - 1);
|
||||
}
|
||||
xfs_trans_inode_alloc_buf(tp, fbuf);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Allocate new inodes in the allocation group specified by agbp.
|
||||
* Return 0 for success, else error code.
|
||||
@ -164,24 +245,15 @@ xfs_ialloc_ag_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 */
|
||||
xfs_daddr_t d; /* disk addr of buffer */
|
||||
xfs_agnumber_t agno;
|
||||
int error;
|
||||
xfs_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 */
|
||||
int i;
|
||||
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 */
|
||||
int version; /* inode version number to use */
|
||||
int isaligned = 0; /* inode allocation at stripe unit */
|
||||
/* boundary */
|
||||
unsigned int gen;
|
||||
|
||||
args.tp = tp;
|
||||
args.mp = tp->t_mountp;
|
||||
@ -202,12 +274,12 @@ xfs_ialloc_ag_alloc(
|
||||
*/
|
||||
agi = XFS_BUF_TO_AGI(agbp);
|
||||
newino = be32_to_cpu(agi->agi_newino);
|
||||
agno = be32_to_cpu(agi->agi_seqno);
|
||||
args.agbno = XFS_AGINO_TO_AGBNO(args.mp, newino) +
|
||||
XFS_IALLOC_BLOCKS(args.mp);
|
||||
if (likely(newino != NULLAGINO &&
|
||||
(args.agbno < be32_to_cpu(agi->agi_length)))) {
|
||||
args.fsbno = XFS_AGB_TO_FSB(args.mp,
|
||||
be32_to_cpu(agi->agi_seqno), args.agbno);
|
||||
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
|
||||
args.type = XFS_ALLOCTYPE_THIS_BNO;
|
||||
args.mod = args.total = args.wasdel = args.isfl =
|
||||
args.userdata = args.minalignslop = 0;
|
||||
@ -258,8 +330,7 @@ xfs_ialloc_ag_alloc(
|
||||
* For now, just allocate blocks up front.
|
||||
*/
|
||||
args.agbno = be32_to_cpu(agi->agi_root);
|
||||
args.fsbno = XFS_AGB_TO_FSB(args.mp,
|
||||
be32_to_cpu(agi->agi_seqno), args.agbno);
|
||||
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
|
||||
/*
|
||||
* Allocate a fixed-size extent of inodes.
|
||||
*/
|
||||
@ -282,8 +353,7 @@ xfs_ialloc_ag_alloc(
|
||||
if (isaligned && args.fsbno == NULLFSBLOCK) {
|
||||
args.type = XFS_ALLOCTYPE_NEAR_BNO;
|
||||
args.agbno = be32_to_cpu(agi->agi_root);
|
||||
args.fsbno = XFS_AGB_TO_FSB(args.mp,
|
||||
be32_to_cpu(agi->agi_seqno), args.agbno);
|
||||
args.fsbno = XFS_AGB_TO_FSB(args.mp, agno, args.agbno);
|
||||
args.alignment = xfs_ialloc_cluster_alignment(&args);
|
||||
if ((error = xfs_alloc_vextent(&args)))
|
||||
return error;
|
||||
@ -294,85 +364,30 @@ xfs_ialloc_ag_alloc(
|
||||
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(args.mp)) {
|
||||
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) /
|
||||
args.mp->m_sb.sb_blocksize;
|
||||
nbufs = (int)args.len / blks_per_cluster;
|
||||
ninodes = blks_per_cluster * args.mp->m_sb.sb_inopblock;
|
||||
}
|
||||
/*
|
||||
* Figure out what version number to use in the inodes we create.
|
||||
* If the superblock version has caught up to the one that supports
|
||||
* the new inode format, then use the new inode version. Otherwise
|
||||
* use the old version so that old kernels will continue to be
|
||||
* able to use the file system.
|
||||
*/
|
||||
if (xfs_sb_version_hasnlink(&args.mp->m_sb))
|
||||
version = 2;
|
||||
else
|
||||
version = 1;
|
||||
|
||||
/*
|
||||
* Stamp and write the inode buffers.
|
||||
*
|
||||
* Seed the new inode cluster with a random generation number. This
|
||||
* prevents short-term reuse of generation numbers if a chunk is
|
||||
* freed and then immediately reallocated. We use random numbers
|
||||
* rather than a linear progression to prevent the next generation
|
||||
* number from being easily guessable.
|
||||
*/
|
||||
gen = random32();
|
||||
for (j = 0; j < nbufs; j++) {
|
||||
/*
|
||||
* Get the block.
|
||||
*/
|
||||
d = XFS_AGB_TO_DADDR(args.mp, be32_to_cpu(agi->agi_seqno),
|
||||
args.agbno + (j * blks_per_cluster));
|
||||
fbuf = xfs_trans_get_buf(tp, args.mp->m_ddev_targp, d,
|
||||
args.mp->m_bsize * blks_per_cluster,
|
||||
XFS_BUF_LOCK);
|
||||
ASSERT(fbuf);
|
||||
ASSERT(!XFS_BUF_GETERROR(fbuf));
|
||||
xfs_ialloc_inode_init(args.mp, tp, agno, args.agbno, args.len,
|
||||
random32());
|
||||
|
||||
/*
|
||||
* Initialize all inodes in this buffer and then log them.
|
||||
*
|
||||
* XXX: It would be much better if we had just one transaction to
|
||||
* log a whole cluster of inodes instead of all the individual
|
||||
* transactions causing a lot of log traffic.
|
||||
*/
|
||||
xfs_biozero(fbuf, 0, ninodes << args.mp->m_sb.sb_inodelog);
|
||||
for (i = 0; i < ninodes; i++) {
|
||||
int ioffset = i << args.mp->m_sb.sb_inodelog;
|
||||
uint isize = sizeof(struct xfs_dinode);
|
||||
|
||||
free = xfs_make_iptr(args.mp, fbuf, i);
|
||||
free->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
|
||||
free->di_version = version;
|
||||
free->di_gen = cpu_to_be32(gen);
|
||||
free->di_next_unlinked = cpu_to_be32(NULLAGINO);
|
||||
xfs_trans_log_buf(tp, fbuf, ioffset, ioffset + isize - 1);
|
||||
}
|
||||
xfs_trans_inode_alloc_buf(tp, fbuf);
|
||||
}
|
||||
/*
|
||||
* Convert the results.
|
||||
*/
|
||||
newino = XFS_OFFBNO_TO_AGINO(args.mp, args.agbno, 0);
|
||||
be32_add_cpu(&agi->agi_count, newlen);
|
||||
be32_add_cpu(&agi->agi_freecount, newlen);
|
||||
agno = be32_to_cpu(agi->agi_seqno);
|
||||
down_read(&args.mp->m_peraglock);
|
||||
args.mp->m_perag[agno].pagi_freecount += newlen;
|
||||
up_read(&args.mp->m_peraglock);
|
||||
agi->agi_newino = cpu_to_be32(newino);
|
||||
|
||||
/*
|
||||
* Insert records describing the new inode chunk into the btree.
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user