diff options
Diffstat (limited to 'fs/jfs/jfs_dmap.c')
| -rw-r--r-- | fs/jfs/jfs_dmap.c | 180 |
1 files changed, 90 insertions, 90 deletions
diff --git a/fs/jfs/jfs_dmap.c b/fs/jfs/jfs_dmap.c index f05ebb62918205..23546c8fd48bd4 100644 --- a/fs/jfs/jfs_dmap.c +++ b/fs/jfs/jfs_dmap.c @@ -3,16 +3,16 @@ * * 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 */ @@ -30,28 +30,28 @@ * * 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 @@ -59,7 +59,7 @@ * 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. */ @@ -120,7 +120,7 @@ static int dbGetL2AGSize(s64 nblocks); /* * 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. @@ -146,7 +146,7 @@ static const s8 budtab[256] = { /* - * NAME: dbMount() + * NAME: dbMount() * * FUNCTION: initializate the block allocation map. * @@ -223,12 +223,12 @@ int dbMount(struct inode *ipbmap) /* - * 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: @@ -311,7 +311,7 @@ int dbSync(struct inode *ipbmap) /* - * NAME: dbFree() + * NAME: dbFree() * * FUNCTION: free the specified block range from the working block * allocation map. @@ -397,7 +397,7 @@ int dbFree(struct inode *ip, s64 blkno, s64 nblocks) * * 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. * @@ -475,7 +475,7 @@ dbUpdatePMap(struct inode *ipbmap, /* 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. */ @@ -662,11 +662,11 @@ unlock: * 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 @@ -713,7 +713,7 @@ int dbAlloc(struct inode *ip, s64 hint, s64 nblocks, s64 * results) #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); @@ -906,7 +906,7 @@ int dbAllocExact(struct inode *ip, s64 blkno, int 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) { @@ -1333,7 +1333,7 @@ dbAllocNear(struct bmap * bmp, * 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 @@ -1398,7 +1398,7 @@ dbAllocAG(struct bmap * bmp, int agno, s64 nblocks, int l2nb, s64 * results) * 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 @@ -1450,7 +1450,7 @@ dbAllocAG(struct bmap * bmp, int agno, s64 nblocks, int l2nb, s64 * results) (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 @@ -1633,7 +1633,7 @@ static int dbFindCtl(struct bmap * bmp, int l2nb, int level, s64 * blkno) /* 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--) { @@ -1677,7 +1677,7 @@ static int dbFindCtl(struct bmap * bmp, int l2nb, int level, s64 * blkno) } /* 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); @@ -1700,12 +1700,12 @@ static int dbFindCtl(struct bmap * bmp, int l2nb, int level, s64 * blkno) * 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 @@ -1872,14 +1872,14 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results) * * 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 @@ -1890,7 +1890,7 @@ dbAllocCtl(struct bmap * bmp, s64 nblocks, int l2nb, s64 blkno, s64 * results) * -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 @@ -2032,7 +2032,7 @@ static int dbFreeDmap(struct bmap * bmp, struct dmap * dp, s64 blkno, /* 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; @@ -2245,7 +2245,7 @@ static int dbFreeBits(struct bmap * bmp, struct dmap * dp, s64 blkno, * 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, @@ -2267,7 +2267,7 @@ static int dbFreeBits(struct bmap * bmp, struct dmap * dp, s64 blkno, */ if (nb < DBWORD) { /* free (zero) the appropriate bits within this - * dmap word. + * dmap word. */ dp->wmap[word] &= cpu_to_le32(~(ONES << (DBWORD - nb) @@ -2327,7 +2327,7 @@ static int dbFreeBits(struct bmap * bmp, struct dmap * dp, s64 blkno, 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; @@ -2378,7 +2378,7 @@ static int dbFreeBits(struct bmap * bmp, struct dmap * dp, s64 blkno, * 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. * @@ -2590,7 +2590,7 @@ static void dbSplit(dmtree_t * tp, int leafno, int splitsz, int newval) } } - /* 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); @@ -2638,7 +2638,7 @@ static int dbBackSplit(dmtree_t * tp, int leafno) /* 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. */ @@ -2853,7 +2853,7 @@ static void dbAdjTree(dmtree_t * tp, int leafno, int newval) * 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 @@ -2869,7 +2869,7 @@ static void dbAdjTree(dmtree_t * tp, int leafno, int newval) * * RETURN VALUES: * 0 - success - * -ENOSPC - insufficient free blocks. + * -ENOSPC - insufficient free blocks. */ static int dbFindLeaf(dmtree_t * tp, int l2nb, int *leafidx) { @@ -3090,7 +3090,7 @@ static int blkstol2(s64 nb) /* - * NAME: dbAllocBottomUp() + * NAME: dbAllocBottomUp() * * FUNCTION: alloc the specified block range from the working block * allocation map. @@ -3241,7 +3241,7 @@ static int dbAllocDmapBU(struct bmap * bmp, struct dmap * dp, s64 blkno, 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; @@ -3273,7 +3273,7 @@ static int dbAllocDmapBU(struct bmap * bmp, struct dmap * dp, s64 blkno, * NAME: dbExtendFS() * * FUNCTION: extend bmap from blkno for nblocks; - * dbExtendFS() updates bmap ready for dbAllocBottomUp(); + * dbExtendFS() updates bmap ready for dbAllocBottomUp(); * * L2 * | @@ -3284,7 +3284,7 @@ static int dbAllocDmapBU(struct bmap * bmp, struct dmap * dp, s64 blkno, * 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) { @@ -3330,7 +3330,7 @@ int dbExtendFS(struct inode *ipbmap, s64 blkno, s64 nblocks) 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; @@ -3491,7 +3491,7 @@ int dbExtendFS(struct inode *ipbmap, s64 blkno, s64 nblocks) } /* 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); @@ -3515,7 +3515,7 @@ int dbExtendFS(struct inode *ipbmap, s64 blkno, s64 nblocks) } /* 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); @@ -3570,7 +3570,7 @@ void dbFinalizeBmap(struct inode *ipbmap) * finalize bmap control page */ //finalize: - /* + /* * compute db_agpref: preferred ag to allocate from * (the leftmost ag with average free space in it); */ @@ -3614,9 +3614,9 @@ void dbFinalizeBmap(struct inode *ipbmap) /* * 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); @@ -3635,13 +3635,13 @@ void dbFinalizeBmap(struct inode *ipbmap) /* * 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: @@ -3677,7 +3677,7 @@ static int dbInitDmap(struct dmap * dp, s64 Blkno, int nblocks) /* * 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) { @@ -3709,7 +3709,7 @@ static int dbInitDmap(struct dmap * dp, s64 Blkno, int nblocks) } /* - * mark bits following the range to be freed (non-existing + * mark bits following the range to be freed (non-existing * blocks) as allocated (ONES) */ @@ -3741,11 +3741,11 @@ static int dbInitDmap(struct dmap * dp, s64 Blkno, int nblocks) /* * 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 @@ -3769,7 +3769,7 @@ static int dbInitDmapTree(struct dmap * dp) /* 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++) @@ -3782,10 +3782,10 @@ static int dbInitDmapTree(struct dmap * dp) /* * 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 @@ -3813,15 +3813,15 @@ static int dbInitTree(struct dmaptree * dtp) /* * 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; @@ -3845,10 +3845,10 @@ static int dbInitTree(struct dmaptree * dtp) * 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), @@ -3857,7 +3857,7 @@ static int dbInitTree(struct dmaptree * dtp) /* 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; @@ -3885,8 +3885,8 @@ static int dbInitDmapCtl(struct dmapctl * dcp, int level, int i) 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]; @@ -3900,9 +3900,9 @@ static int dbInitDmapCtl(struct dmapctl * dcp, int level, int i) /* * NAME: dbGetL2AGSize()/ujfs_getagl2size() - * + * * FUNCTION: Determine log2(allocation group size) from aggregate size - * + * * PARAMETERS: * nblocks - Number of blocks in aggregate * @@ -3935,8 +3935,8 @@ static int dbGetL2AGSize(s64 nblocks) /* * 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; @@ -3968,7 +3968,7 @@ s64 dbMapFileSizeToMapSize(struct inode * ipbmap) 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. */ @@ -3990,7 +3990,7 @@ s64 dbMapFileSizeToMapSize(struct inode * ipbmap) 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; |