*
* 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; either version 2 of the License, or
+ * the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
- *
+ *
* This program is distributed in the hope that it will 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 to the Free Software
+ * along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
*
* the working state of the block allocation map is accessed in
* two directions:
- *
+ *
* 1) allocation and free requests that start at the dmap
* level and move up through the dmap control pages (i.e.
* the vast majority of requests).
- *
- * 2) allocation requests that start at dmap control page
+ *
+ * 2) allocation requests that start at dmap control page
* level and work down towards the dmaps.
- *
- * the serialization scheme used here is as follows.
*
- * requests which start at the bottom are serialized against each
- * other through buffers and each requests holds onto its buffers
- * as it works it way up from a single dmap to the required level
+ * the serialization scheme used here is as follows.
+ *
+ * requests which start at the bottom are serialized against each
+ * other through buffers and each requests holds onto its buffers
+ * as it works it way up from a single dmap to the required level
* of dmap control page.
* requests that start at the top are serialized against each other
* and request that start from the bottom by the multiple read/single
* write inode lock of the bmap inode. requests starting at the top
* take this lock in write mode while request starting at the bottom
* take the lock in read mode. a single top-down request may proceed
- * exclusively while multiple bottoms-up requests may proceed
- * simultaneously (under the protection of busy buffers).
- *
+ * exclusively while multiple bottoms-up requests may proceed
+ * simultaneously (under the protection of busy buffers).
+ *
* in addition to information found in dmaps and dmap control pages,
* the working state of the block allocation map also includes read/
* write information maintained in the bmap descriptor (i.e. total
* a single exclusive lock (BMAP_LOCK) is used to guard this information
* in the face of multiple-bottoms up requests.
* (lock ordering: IREAD_LOCK, BMAP_LOCK);
- *
+ *
* accesses to the persistent state of the block allocation map (limited
* to the persistent bitmaps in dmaps) is guarded by (busy) buffers.
*/
-#define BMAP_LOCK_INIT(bmp) init_MUTEX(&bmp->db_bmaplock)
-#define BMAP_LOCK(bmp) down(&bmp->db_bmaplock)
-#define BMAP_UNLOCK(bmp) up(&bmp->db_bmaplock)
+#define BMAP_LOCK_INIT(bmp) mutex_init(&bmp->db_bmaplock)
+#define BMAP_LOCK(bmp) mutex_lock(&bmp->db_bmaplock)
+#define BMAP_UNLOCK(bmp) mutex_unlock(&bmp->db_bmaplock)
/*
* forward references
/*
* buddy table
*
- * table used for determining buddy sizes within characters of
+ * table used for determining buddy sizes within characters of
* dmap bitmap words. the characters themselves serve as indexes
* into the table, with the table elements yielding the maximum
* binary buddy of free bits within the character.
*/
-static s8 budtab[256] = {
+static const s8 budtab[256] = {
3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/*
- * NAME: dbMount()
+ * NAME: dbMount()
*
* FUNCTION: initializate the block allocation map.
*
/*
- * NAME: dbUnmount()
+ * NAME: dbUnmount()
*
* FUNCTION: terminate the block allocation map in preparation for
* file system unmount.
*
- * the in-core bmap descriptor is written to disk and
+ * the in-core bmap descriptor is written to disk and
* the memory for this descriptor is freed.
*
* PARAMETERS:
/*
- * NAME: dbFree()
+ * NAME: dbFree()
*
* FUNCTION: free the specified block range from the working block
* allocation map.
*
* FUNCTION: update the allocation state (free or allocate) of the
* specified block range in the persistent block allocation map.
- *
+ *
* the blocks will be updated in the persistent map one
* dmap at a time.
*
* PARAMETERS:
* ipbmap - pointer to in-core inode for the block map.
- * free - TRUE if block range is to be freed from the persistent
- * map; FALSE if it is to be allocated.
+ * free - 'true' if block range is to be freed from the persistent
+ * map; 'false' if it is to be allocated.
* blkno - starting block number of the range.
* nblocks - number of contiguous blocks in the range.
* tblk - transaction block;
/* update the bits of the dmap words. the first and last
* words may only have a subset of their bits updated. if
* this is the case, we'll work against that word (i.e.
- * partial first and/or last) only in a single pass. a
+ * partial first and/or last) only in a single pass. a
* single pass will also be used to update all words that
* are to have all their bits updated.
*/
* the block allocation policy uses hints and a multi-step
* approach.
*
- * for allocation requests smaller than the number of blocks
+ * for allocation requests smaller than the number of blocks
* per dmap, we first try to allocate the new blocks
* immediately following the hint. if these blocks are not
* available, we try to allocate blocks near the hint. if
- * no blocks near the hint are available, we next try to
+ * no blocks near the hint are available, we next try to
* allocate within the same dmap as contains the hint.
*
* if no blocks are available in the dmap or the allocation
#endif /* _STILL_TO_PORT */
/* get the log2 number of blocks to be allocated.
- * if the number of blocks is not a log2 multiple,
+ * if the number of blocks is not a log2 multiple,
* it will be rounded up to the next log2 multiple.
*/
l2nb = BLKSTOL2(nblocks);
* validate extent request:
*
* note: defragfs policy:
- * max 64 blocks will be moved.
+ * max 64 blocks will be moved.
* allocation request size must be satisfied from a single dmap.
*/
if (nblocks <= 0 || nblocks > BPERDMAP || blkno >= bmp->db_mapsize) {
* or two sub-trees, depending on the allocation group size.
* we search the top nodes of these subtrees left to right for
* sufficient free space. if sufficient free space is found,
- * the subtree is searched to find the leftmost leaf that
+ * the subtree is searched to find the leftmost leaf that
* has free space. once we have made it to the leaf, we
* move the search to the next lower level dmap control page
* corresponding to this leaf. we continue down the dmap control
* that fully describes the allocation group since the allocation
* group is already fully described by a dmap. in this case, we
* just call dbAllocCtl() to search the dmap tree and allocate the
- * required space if available.
+ * required space if available.
*
* if the allocation group is completely free, dbAllocCtl() is
* also called to allocate the required space. this is done for
(1 << (L2LPERCTL - (bmp->db_agheigth << 1))) / bmp->db_agwidth;
ti = bmp->db_agstart + bmp->db_agwidth * (agno & (agperlev - 1));
- /* dmap control page trees fan-out by 4 and a single allocation
+ /* dmap control page trees fan-out by 4 and a single allocation
* group may be described by 1 or 2 subtrees within the ag level
* dmap control page, depending upon the ag size. examine the ag's
* subtrees for sufficient free space, starting with the leftmost
/* starting at the specified dmap control page level and block
* number, search down the dmap control levels for the starting
- * block number of a dmap page that contains or starts off
+ * block number of a dmap page that contains or starts off
* sufficient free blocks.
*/
for (lev = level, b = *blkno; lev >= 0; lev--) {
}
/* adjust the block number to reflect the location within
- * the dmap control page (i.e. the leaf) at which free
+ * the dmap control page (i.e. the leaf) at which free
* space was found.
*/
b += (((s64) leafidx) << budmin);
* NAME: dbAllocCtl()
*
* FUNCTION: attempt to allocate a specified number of contiguous
- * blocks starting within a specific dmap.
- *
+ * blocks starting within a specific dmap.
+ *
* this routine is called by higher level routines that search
* the dmap control pages above the actual dmaps for contiguous
* free space. the result of successful searches by these
- * routines are the starting block numbers within dmaps, with
+ * routines are the starting block numbers within dmaps, with
* the dmaps themselves containing the desired contiguous free
* space or starting a contiguous free space of desired size
* that is made up of the blocks of one or more dmaps. these
*
* FUNCTION: attempt to allocate a specified number of contiguous blocks
* from a specified dmap.
- *
+ *
* this routine checks if the contiguous blocks are available.
* if so, nblocks of blocks are allocated; otherwise, ENOSPC is
* returned.
*
* PARAMETERS:
* mp - pointer to bmap descriptor
- * dp - pointer to dmap to attempt to allocate blocks from.
+ * dp - pointer to dmap to attempt to allocate blocks from.
* l2nb - log2 number of contiguous block desired.
* nblocks - actual number of contiguous block desired.
* results - on successful return, set to the starting block number
* -ENOSPC - insufficient disk resources
* -EIO - i/o error
*
- * serialization: IREAD_LOCK(ipbmap), e.g., from dbAlloc(), or
+ * serialization: IREAD_LOCK(ipbmap), e.g., from dbAlloc(), or
* IWRITE_LOCK(ipbmap), e.g., dbAllocCtl(), held on entry/exit;
*/
static int
/* root changed. bubble the change up to the dmap control pages.
* if the adjustment of the upper level control pages fails,
- * backout the deallocation.
+ * backout the deallocation.
*/
if ((rc = dbAdjCtl(bmp, blkno, dp->tree.stree[ROOT], 0, 0))) {
word = (blkno & (BPERDMAP - 1)) >> L2DBWORD;
* words (i.e. partial first and/or last) on an individual basis
* (a single pass), freeing the bits of interest by hand and updating
* the leaf corresponding to the dmap word. a single pass will be used
- * for all dmap words fully contained within the specified range.
+ * for all dmap words fully contained within the specified range.
* within this pass, the bits of all fully contained dmap words will
* be marked as free in a single shot and the leaves will be updated. a
* single leaf may describe the free space of multiple dmap words,
*/
if (nb < DBWORD) {
/* free (zero) the appropriate bits within this
- * dmap word.
+ * dmap word.
*/
dp->wmap[word] &=
cpu_to_le32(~(ONES << (DBWORD - nb)
BMAP_LOCK(bmp);
- /* update the free count for the allocation group and
+ /* update the free count for the allocation group and
* map.
*/
agno = blkno >> bmp->db_agl2size;
* or deallocation resulted in the root change. this range
* is respresented by a single leaf of the current dmapctl
* and the leaf will be updated with this value, possibly
- * causing a binary buddy system within the leaves to be
+ * causing a binary buddy system within the leaves to be
* split or joined. the update may also cause the dmapctl's
* dmtree to be updated.
*
* requires the dmap control page to be adjusted.
* newval - the new value of the lower level dmap or dmap control
* page root.
- * alloc - TRUE if adjustment is due to an allocation.
+ * alloc - 'true' if adjustment is due to an allocation.
* level - current level of dmap control page (i.e. L0, L1, L2) to
* be adjusted.
*
}
}
- /* adjust the dmap tree to reflect the specified leaf's new
+ /* adjust the dmap tree to reflect the specified leaf's new
* value.
*/
dbAdjTree(tp, leafno, newval);
/* the back split is accomplished by iteratively finding the leaf
* that starts the buddy system that contains the specified leaf and
* splitting that system in two. this iteration continues until
- * the specified leaf becomes the start of a buddy system.
+ * the specified leaf becomes the start of a buddy system.
*
* determine maximum possible l2 size for the specified leaf.
*/
* NAME: dbFindLeaf()
*
* FUNCTION: search a dmtree_t for sufficient free blocks, returning
- * the index of a leaf describing the free blocks if
+ * the index of a leaf describing the free blocks if
* sufficient free blocks are found.
*
* the search starts at the top of the dmtree_t tree and
*
* RETURN VALUES:
* 0 - success
- * -ENOSPC - insufficient free blocks.
+ * -ENOSPC - insufficient free blocks.
*/
static int dbFindLeaf(dmtree_t * tp, int l2nb, int *leafidx)
{
/*
- * NAME: dbAllocBottomUp()
+ * NAME: dbAllocBottomUp()
*
* FUNCTION: alloc the specified block range from the working block
* allocation map.
BMAP_LOCK(bmp);
/* if this allocation group is completely free,
- * update the highest active allocation group number
+ * update the highest active allocation group number
* if this allocation group is the new max.
*/
agno = blkno >> bmp->db_agl2size;
* NAME: dbExtendFS()
*
* FUNCTION: extend bmap from blkno for nblocks;
- * dbExtendFS() updates bmap ready for dbAllocBottomUp();
+ * dbExtendFS() updates bmap ready for dbAllocBottomUp();
*
* L2
* |
* d0,...,dn d0,...,dn d0,...,dn d0,...,dn d0,...,dn d0,.,dm;
* L2L1L0d0,...,dnL0d0,...,dnL0d0,...,dnL1L0d0,...,dnL0d0,...,dnL0d0,..dm
*
- * <---old---><----------------------------extend----------------------->
+ * <---old---><----------------------------extend----------------------->
*/
int dbExtendFS(struct inode *ipbmap, s64 blkno, s64 nblocks)
{
struct jfs_sb_info *sbi = JFS_SBI(ipbmap->i_sb);
int nbperpage = sbi->nbperpage;
- int i, i0 = TRUE, j, j0 = TRUE, k, n;
+ int i, i0 = true, j, j0 = true, k, n;
s64 newsize;
s64 p;
struct metapage *mp, *l2mp, *l1mp = NULL, *l0mp = NULL;
bmp->db_numag += ((u32) newsize % (u32) bmp->db_agsize) ? 1 : 0;
/*
- * reconfigure db_agfree[]
+ * reconfigure db_agfree[]
* from old AG configuration to new AG configuration;
*
* coalesce contiguous k (newAGSize/oldAGSize) AGs;
j = (blkno & (MAXL1SIZE - 1)) >> L2MAXL0SIZE;
l1leaf = l1dcp->stree + CTLLEAFIND + j;
p = BLKTOL0(blkno, sbi->l2nbperpage);
- j0 = FALSE;
+ j0 = false;
} else {
/* assign/init L1 page */
l1mp = get_metapage(ipbmap, p, PSIZE, 0);
l0leaf = l0dcp->stree + CTLLEAFIND + i;
p = BLKTODMAP(blkno,
sbi->l2nbperpage);
- i0 = FALSE;
+ i0 = false;
} else {
/* assign/init L0 page */
l0mp = get_metapage(ipbmap, p, PSIZE, 0);
} /* for each dmap in a L0 */
/*
- * build current L0 page from its leaves, and
+ * build current L0 page from its leaves, and
* initialize corresponding parent L1 leaf
*/
*l1leaf = dbInitDmapCtl(l0dcp, 0, ++i);
} /* for each L0 in a L1 */
/*
- * build current L1 page from its leaves, and
+ * build current L1 page from its leaves, and
* initialize corresponding parent L2 leaf
*/
*l2leaf = dbInitDmapCtl(l1dcp, 1, ++j);
* finalize bmap control page
*/
//finalize:
- /*
+ /*
* compute db_agpref: preferred ag to allocate from
* (the leftmost ag with average free space in it);
*/
/*
* compute db_aglevel, db_agheigth, db_width, db_agstart:
- * an ag is covered in aglevel dmapctl summary tree,
- * at agheight level height (from leaf) with agwidth number of nodes
- * each, which starts at agstart index node of the smmary tree node
+ * an ag is covered in aglevel dmapctl summary tree,
+ * at agheight level height (from leaf) with agwidth number of nodes
+ * each, which starts at agstart index node of the smmary tree node
* array;
*/
bmp->db_aglevel = BMAPSZTOLEV(bmp->db_agsize);
/*
* NAME: dbInitDmap()/ujfs_idmap_page()
- *
+ *
* FUNCTION: initialize working/persistent bitmap of the dmap page
* for the specified number of blocks:
- *
+ *
* at entry, the bitmaps had been initialized as free (ZEROS);
- * The number of blocks will only account for the actually
- * existing blocks. Blocks which don't actually exist in
+ * The number of blocks will only account for the actually
+ * existing blocks. Blocks which don't actually exist in
* the aggregate will be marked as allocated (ONES);
*
* PARAMETERS:
/*
* free the bits corresponding to the block range (ZEROS):
- * note: not all bits of the first and last words may be contained
+ * note: not all bits of the first and last words may be contained
* within the block range.
*/
for (r = nblocks; r > 0; r -= nb, blkno += nb) {
}
/*
- * mark bits following the range to be freed (non-existing
+ * mark bits following the range to be freed (non-existing
* blocks) as allocated (ONES)
*/
/*
* NAME: dbInitDmapTree()/ujfs_complete_dmap()
- *
+ *
* FUNCTION: initialize summary tree of the specified dmap:
*
* at entry, bitmap of the dmap has been initialized;
- *
+ *
* PARAMETERS:
* dp - dmap to complete
* blkno - starting block number for this dmap
/* init each leaf from corresponding wmap word:
* note: leaf is set to NOFREE(-1) if all blocks of corresponding
- * bitmap word are allocated.
+ * bitmap word are allocated.
*/
cp = tp->stree + le32_to_cpu(tp->leafidx);
for (i = 0; i < LPERDMAP; i++)
/*
* NAME: dbInitTree()/ujfs_adjtree()
- *
+ *
* FUNCTION: initialize binary buddy summary tree of a dmap or dmapctl.
*
- * at entry, the leaves of the tree has been initialized
+ * at entry, the leaves of the tree has been initialized
* from corresponding bitmap word or root of summary tree
* of the child control page;
* configure binary buddy system at the leaf level, then
/*
* configure the leaf levevl into binary buddy system
*
- * Try to combine buddies starting with a buddy size of 1
- * (i.e. two leaves). At a buddy size of 1 two buddy leaves
- * can be combined if both buddies have a maximum free of l2min;
- * the combination will result in the left-most buddy leaf having
- * a maximum free of l2min+1.
- * After processing all buddies for a given size, process buddies
- * at the next higher buddy size (i.e. current size * 2) and
- * the next maximum free (current free + 1).
- * This continues until the maximum possible buddy combination
+ * Try to combine buddies starting with a buddy size of 1
+ * (i.e. two leaves). At a buddy size of 1 two buddy leaves
+ * can be combined if both buddies have a maximum free of l2min;
+ * the combination will result in the left-most buddy leaf having
+ * a maximum free of l2min+1.
+ * After processing all buddies for a given size, process buddies
+ * at the next higher buddy size (i.e. current size * 2) and
+ * the next maximum free (current free + 1).
+ * This continues until the maximum possible buddy combination
* yields maximum free.
*/
for (l2free = dtp->budmin, bsize = 1; l2free < l2max;
* bubble summary information of leaves up the tree.
*
* Starting at the leaf node level, the four nodes described by
- * the higher level parent node are compared for a maximum free and
- * this maximum becomes the value of the parent node.
- * when all lower level nodes are processed in this fashion then
- * move up to the next level (parent becomes a lower level node) and
+ * the higher level parent node are compared for a maximum free and
+ * this maximum becomes the value of the parent node.
+ * when all lower level nodes are processed in this fashion then
+ * move up to the next level (parent becomes a lower level node) and
* continue the process for that level.
*/
for (child = le32_to_cpu(dtp->leafidx),
/* get index of 1st node of parent level */
parent = (child - 1) >> 2;
- /* set the value of the parent node as the maximum
+ /* set the value of the parent node as the maximum
* of the four nodes of the current level.
*/
for (i = 0, cp = tp + child, cp1 = tp + parent;
dcp->budmin = L2BPERDMAP + L2LPERCTL * level;
/*
- * initialize the leaves of current level that were not covered
- * by the specified input block range (i.e. the leaves have no
+ * initialize the leaves of current level that were not covered
+ * by the specified input block range (i.e. the leaves have no
* low level dmapctl or dmap).
*/
cp = &dcp->stree[CTLLEAFIND + i];
/*
* NAME: dbGetL2AGSize()/ujfs_getagl2size()
- *
+ *
* FUNCTION: Determine log2(allocation group size) from aggregate size
- *
+ *
* PARAMETERS:
* nblocks - Number of blocks in aggregate
*
/*
* NAME: dbMapFileSizeToMapSize()
- *
- * FUNCTION: compute number of blocks the block allocation map file
+ *
+ * FUNCTION: compute number of blocks the block allocation map file
* can cover from the map file size;
*
* RETURNS: Number of blocks which can be covered by this block map file;
npages = nblocks >> JFS_SBI(sb)->l2nbperpage;
level = BMAPPGTOLEV(npages);
- /* At each level, accumulate the number of dmap pages covered by
+ /* At each level, accumulate the number of dmap pages covered by
* the number of full child levels below it;
* repeat for the last incomplete child level.
*/
npages--;
}
- /* convert the number of dmaps into the number of blocks
+ /* convert the number of dmaps into the number of blocks
* which can be covered by the dmaps;
*/
nblocks = ndmaps << L2BPERDMAP;
git://git.onelab.eu / linux-2.6.git / blobdiff