From: Dave Chinner <dchinner@xxxxxxxxxx>
To match the split-up of the kernel xfs_rtalloc.c file, convert the
libxfs version of xfs_rtalloc.c to match the newly shared kernel
source file with all the realtime bitmap functions in it,
xfs_rtbitmap.c.
Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
libxfs/Makefile | 2 +-
libxfs/xfs_rtalloc.c | 776 ----------------------------------------
libxfs/xfs_rtbitmap.c | 951 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 952 insertions(+), 777 deletions(-)
delete mode 100644 libxfs/xfs_rtalloc.c
create mode 100644 libxfs/xfs_rtbitmap.c
diff --git a/libxfs/Makefile b/libxfs/Makefile
index 4522218..ae15a5d 100644
--- a/libxfs/Makefile
+++ b/libxfs/Makefile
@@ -35,7 +35,7 @@ CFILES = cache.c \
xfs_inode_fork.c \
xfs_ialloc_btree.c \
xfs_log_rlimit.c \
- xfs_rtalloc.c \
+ xfs_rtbitmap.c \
xfs_sb.c \
xfs_symlink_remote.c \
xfs_trans_resv.c
diff --git a/libxfs/xfs_rtalloc.c b/libxfs/xfs_rtalloc.c
deleted file mode 100644
index f5a90b2..0000000
--- a/libxfs/xfs_rtalloc.c
+++ /dev/null
@@ -1,776 +0,0 @@
-/*
- * Copyright (c) 2000-2005 Silicon Graphics, Inc.
- * All Rights Reserved.
- *
- * 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.
- *
- * This program is distributed in the hope that it would 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 the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <xfs.h>
-
-/*
- * Prototypes for internal functions.
- */
-
-
-STATIC int xfs_rtfind_back(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
- xfs_rtblock_t, xfs_rtblock_t *);
-STATIC int xfs_rtfind_forw(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
- xfs_rtblock_t, xfs_rtblock_t *);
-STATIC int xfs_rtmodify_range(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
- xfs_extlen_t, int);
-STATIC int xfs_rtmodify_summary(xfs_mount_t *, xfs_trans_t *, int,
- xfs_rtblock_t, int, xfs_buf_t **, xfs_fsblock_t *);
-
-/*
- * Internal functions.
- */
-
-/*
- * Get a buffer for the bitmap or summary file block specified.
- * The buffer is returned read and locked.
- */
-STATIC int /* error */
-xfs_rtbuf_get(
- xfs_mount_t *mp, /* file system mount structure */
- xfs_trans_t *tp, /* transaction pointer */
- xfs_rtblock_t block, /* block number in bitmap or summary */
- int issum, /* is summary not bitmap */
- xfs_buf_t **bpp) /* output: buffer for the block */
-{
- xfs_buf_t *bp; /* block buffer, result */
- xfs_inode_t *ip; /* bitmap or summary inode */
- xfs_bmbt_irec_t map;
- int nmap = 1;
- int error; /* error value */
-
- ip = issum ? mp->m_rsumip : mp->m_rbmip;
-
- error = xfs_bmapi_read(ip, block, 1, &map, &nmap, XFS_DATA_FORK);
- if (error)
- return error;
-
- ASSERT(map.br_startblock != NULLFSBLOCK);
- error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
- XFS_FSB_TO_DADDR(mp, map.br_startblock),
- mp->m_bsize, 0, &bp, NULL);
- if (error)
- return error;
- ASSERT(!xfs_buf_geterror(bp));
- *bpp = bp;
- return 0;
-}
-
-/*
- * Searching backward from start to limit, find the first block whose
- * allocated/free state is different from start's.
- */
-STATIC int /* error */
-xfs_rtfind_back(
- xfs_mount_t *mp, /* file system mount point */
- xfs_trans_t *tp, /* transaction pointer */
- xfs_rtblock_t start, /* starting block to look at */
- xfs_rtblock_t limit, /* last block to look at */
- xfs_rtblock_t *rtblock) /* out: start block found */
-{
- xfs_rtword_t *b; /* current word in buffer */
- int bit; /* bit number in the word */
- xfs_rtblock_t block; /* bitmap block number */
- xfs_buf_t *bp; /* buf for the block */
- xfs_rtword_t *bufp; /* starting word in buffer */
- int error; /* error value */
- xfs_rtblock_t firstbit; /* first useful bit in the word */
- xfs_rtblock_t i; /* current bit number rel. to start */
- xfs_rtblock_t len; /* length of inspected area */
- xfs_rtword_t mask; /* mask of relevant bits for value */
- xfs_rtword_t want; /* mask for "good" values */
- xfs_rtword_t wdiff; /* difference from wanted value */
- int word; /* word number in the buffer */
-
- /*
- * Compute and read in starting bitmap block for starting block.
- */
- block = XFS_BITTOBLOCK(mp, start);
- error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
- if (error) {
- return error;
- }
- bufp = bp->b_addr;
- /*
- * Get the first word's index & point to it.
- */
- word = XFS_BITTOWORD(mp, start);
- b = &bufp[word];
- bit = (int)(start & (XFS_NBWORD - 1));
- len = start - limit + 1;
- /*
- * Compute match value, based on the bit at start: if 1 (free)
- * then all-ones, else all-zeroes.
- */
- want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
- /*
- * If the starting position is not word-aligned, deal with the
- * partial word.
- */
- if (bit < XFS_NBWORD - 1) {
- /*
- * Calculate first (leftmost) bit number to look at,
- * and mask for all the relevant bits in this word.
- */
- firstbit = XFS_RTMAX((xfs_srtblock_t)(bit - len + 1), 0);
- mask = (((xfs_rtword_t)1 << (bit - firstbit + 1)) - 1) <<
- firstbit;
- /*
- * Calculate the difference between the value there
- * and what we're looking for.
- */
- if ((wdiff = (*b ^ want) & mask)) {
- /*
- * Different. Mark where we are and return.
- */
- xfs_trans_brelse(tp, bp);
- i = bit - XFS_RTHIBIT(wdiff);
- *rtblock = start - i + 1;
- return 0;
- }
- i = bit - firstbit + 1;
- /*
- * Go on to previous block if that's where the previous word is
- * and we need the previous word.
- */
- if (--word == -1 && i < len) {
- /*
- * If done with this block, get the previous one.
- */
- xfs_trans_brelse(tp, bp);
- error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
- if (error) {
- return error;
- }
- bufp = bp->b_addr;
- word = XFS_BLOCKWMASK(mp);
- b = &bufp[word];
- } else {
- /*
- * Go on to the previous word in the buffer.
- */
- b--;
- }
- } else {
- /*
- * Starting on a word boundary, no partial word.
- */
- i = 0;
- }
- /*
- * Loop over whole words in buffers. When we use up one buffer
- * we move on to the previous one.
- */
- while (len - i >= XFS_NBWORD) {
- /*
- * Compute difference between actual and desired value.
- */
- if ((wdiff = *b ^ want)) {
- /*
- * Different, mark where we are and return.
- */
- xfs_trans_brelse(tp, bp);
- i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
- *rtblock = start - i + 1;
- return 0;
- }
- i += XFS_NBWORD;
- /*
- * Go on to previous block if that's where the previous word is
- * and we need the previous word.
- */
- if (--word == -1 && i < len) {
- /*
- * If done with this block, get the previous one.
- */
- xfs_trans_brelse(tp, bp);
- error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
- if (error) {
- return error;
- }
- bufp = bp->b_addr;
- word = XFS_BLOCKWMASK(mp);
- b = &bufp[word];
- } else {
- /*
- * Go on to the previous word in the buffer.
- */
- b--;
- }
- }
- /*
- * If not ending on a word boundary, deal with the last
- * (partial) word.
- */
- if (len - i) {
- /*
- * Calculate first (leftmost) bit number to look at,
- * and mask for all the relevant bits in this word.
- */
- firstbit = XFS_NBWORD - (len - i);
- mask = (((xfs_rtword_t)1 << (len - i)) - 1) << firstbit;
- /*
- * Compute difference between actual and desired value.
- */
- if ((wdiff = (*b ^ want) & mask)) {
- /*
- * Different, mark where we are and return.
- */
- xfs_trans_brelse(tp, bp);
- i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
- *rtblock = start - i + 1;
- return 0;
- } else
- i = len;
- }
- /*
- * No match, return that we scanned the whole area.
- */
- xfs_trans_brelse(tp, bp);
- *rtblock = start - i + 1;
- return 0;
-}
-
-/*
- * Searching forward from start to limit, find the first block whose
- * allocated/free state is different from start's.
- */
-STATIC int /* error */
-xfs_rtfind_forw(
- xfs_mount_t *mp, /* file system mount point */
- xfs_trans_t *tp, /* transaction pointer */
- xfs_rtblock_t start, /* starting block to look at */
- xfs_rtblock_t limit, /* last block to look at */
- xfs_rtblock_t *rtblock) /* out: start block found */
-{
- xfs_rtword_t *b; /* current word in buffer */
- int bit; /* bit number in the word */
- xfs_rtblock_t block; /* bitmap block number */
- xfs_buf_t *bp; /* buf for the block */
- xfs_rtword_t *bufp; /* starting word in buffer */
- int error; /* error value */
- xfs_rtblock_t i; /* current bit number rel. to start */
- xfs_rtblock_t lastbit; /* last useful bit in the word */
- xfs_rtblock_t len; /* length of inspected area */
- xfs_rtword_t mask; /* mask of relevant bits for value */
- xfs_rtword_t want; /* mask for "good" values */
- xfs_rtword_t wdiff; /* difference from wanted value */
- int word; /* word number in the buffer */
-
- /*
- * Compute and read in starting bitmap block for starting block.
- */
- block = XFS_BITTOBLOCK(mp, start);
- error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
- if (error) {
- return error;
- }
- bufp = bp->b_addr;
- /*
- * Get the first word's index & point to it.
- */
- word = XFS_BITTOWORD(mp, start);
- b = &bufp[word];
- bit = (int)(start & (XFS_NBWORD - 1));
- len = limit - start + 1;
- /*
- * Compute match value, based on the bit at start: if 1 (free)
- * then all-ones, else all-zeroes.
- */
- want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
- /*
- * If the starting position is not word-aligned, deal with the
- * partial word.
- */
- if (bit) {
- /*
- * Calculate last (rightmost) bit number to look at,
- * and mask for all the relevant bits in this word.
- */
- lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
- mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
- /*
- * Calculate the difference between the value there
- * and what we're looking for.
- */
- if ((wdiff = (*b ^ want) & mask)) {
- /*
- * Different. Mark where we are and return.
- */
- xfs_trans_brelse(tp, bp);
- i = XFS_RTLOBIT(wdiff) - bit;
- *rtblock = start + i - 1;
- return 0;
- }
- i = lastbit - bit;
- /*
- * Go on to next block if that's where the next word is
- * and we need the next word.
- */
- if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
- /*
- * If done with this block, get the previous one.
- */
- xfs_trans_brelse(tp, bp);
- error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
- if (error) {
- return error;
- }
- b = bufp = bp->b_addr;
- word = 0;
- } else {
- /*
- * Go on to the previous word in the buffer.
- */
- b++;
- }
- } else {
- /*
- * Starting on a word boundary, no partial word.
- */
- i = 0;
- }
- /*
- * Loop over whole words in buffers. When we use up one buffer
- * we move on to the next one.
- */
- while (len - i >= XFS_NBWORD) {
- /*
- * Compute difference between actual and desired value.
- */
- if ((wdiff = *b ^ want)) {
- /*
- * Different, mark where we are and return.
- */
- xfs_trans_brelse(tp, bp);
- i += XFS_RTLOBIT(wdiff);
- *rtblock = start + i - 1;
- return 0;
- }
- i += XFS_NBWORD;
- /*
- * Go on to next block if that's where the next word is
- * and we need the next word.
- */
- if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
- /*
- * If done with this block, get the next one.
- */
- xfs_trans_brelse(tp, bp);
- error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
- if (error) {
- return error;
- }
- b = bufp = bp->b_addr;
- word = 0;
- } else {
- /*
- * Go on to the next word in the buffer.
- */
- b++;
- }
- }
- /*
- * If not ending on a word boundary, deal with the last
- * (partial) word.
- */
- if ((lastbit = len - i)) {
- /*
- * Calculate mask for all the relevant bits in this word.
- */
- mask = ((xfs_rtword_t)1 << lastbit) - 1;
- /*
- * Compute difference between actual and desired value.
- */
- if ((wdiff = (*b ^ want) & mask)) {
- /*
- * Different, mark where we are and return.
- */
- xfs_trans_brelse(tp, bp);
- i += XFS_RTLOBIT(wdiff);
- *rtblock = start + i - 1;
- return 0;
- } else
- i = len;
- }
- /*
- * No match, return that we scanned the whole area.
- */
- xfs_trans_brelse(tp, bp);
- *rtblock = start + i - 1;
- return 0;
-}
-
-/*
- * Mark an extent specified by start and len freed.
- * Updates all the summary information as well as the bitmap.
- */
-STATIC int /* error */
-xfs_rtfree_range(
- xfs_mount_t *mp, /* file system mount point */
- xfs_trans_t *tp, /* transaction pointer */
- xfs_rtblock_t start, /* starting block to free */
- xfs_extlen_t len, /* length to free */
- xfs_buf_t **rbpp, /* in/out: summary block buffer */
- xfs_fsblock_t *rsb) /* in/out: summary block number */
-{
- xfs_rtblock_t end; /* end of the freed extent */
- int error; /* error value */
- xfs_rtblock_t postblock = 0; /* first block freed > end */
- xfs_rtblock_t preblock = 0; /* first block freed < start */
-
- end = start + len - 1;
- /*
- * Modify the bitmap to mark this extent freed.
- */
- error = xfs_rtmodify_range(mp, tp, start, len, 1);
- if (error) {
- return error;
- }
- /*
- * Assume we're freeing out of the middle of an allocated extent.
- * We need to find the beginning and end of the extent so we can
- * properly update the summary.
- */
- error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
- if (error) {
- return error;
- }
- /*
- * Find the next allocated block (end of allocated extent).
- */
- error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
- &postblock);
- if (error)
- return error;
- /*
- * If there are blocks not being freed at the front of the
- * old extent, add summary data for them to be allocated.
- */
- if (preblock < start) {
- error = xfs_rtmodify_summary(mp, tp,
- XFS_RTBLOCKLOG(start - preblock),
- XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
- if (error) {
- return error;
- }
- }
- /*
- * If there are blocks not being freed at the end of the
- * old extent, add summary data for them to be allocated.
- */
- if (postblock > end) {
- error = xfs_rtmodify_summary(mp, tp,
- XFS_RTBLOCKLOG(postblock - end),
- XFS_BITTOBLOCK(mp, end + 1), -1, rbpp, rsb);
- if (error) {
- return error;
- }
- }
- /*
- * Increment the summary information corresponding to the entire
- * (new) free extent.
- */
- error = xfs_rtmodify_summary(mp, tp,
- XFS_RTBLOCKLOG(postblock + 1 - preblock),
- XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
- return error;
-}
-
-/*
- * Set the given range of bitmap bits to the given value.
- * Do whatever I/O and logging is required.
- */
-STATIC int /* error */
-xfs_rtmodify_range(
- xfs_mount_t *mp, /* file system mount point */
- xfs_trans_t *tp, /* transaction pointer */
- xfs_rtblock_t start, /* starting block to modify */
- xfs_extlen_t len, /* length of extent to modify */
- int val) /* 1 for free, 0 for allocated */
-{
- xfs_rtword_t *b; /* current word in buffer */
- int bit; /* bit number in the word */
- xfs_rtblock_t block; /* bitmap block number */
- xfs_buf_t *bp; /* buf for the block */
- xfs_rtword_t *bufp; /* starting word in buffer */
- int error; /* error value */
- xfs_rtword_t *first; /* first used word in the buffer */
- int i; /* current bit number rel. to start */
- int lastbit; /* last useful bit in word */
- xfs_rtword_t mask; /* mask o frelevant bits for value */
- int word; /* word number in the buffer */
-
- /*
- * Compute starting bitmap block number.
- */
- block = XFS_BITTOBLOCK(mp, start);
- /*
- * Read the bitmap block, and point to its data.
- */
- error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
- if (error) {
- return error;
- }
- bufp = bp->b_addr;
- /*
- * Compute the starting word's address, and starting bit.
- */
- word = XFS_BITTOWORD(mp, start);
- first = b = &bufp[word];
- bit = (int)(start & (XFS_NBWORD - 1));
- /*
- * 0 (allocated) => all zeroes; 1 (free) => all ones.
- */
- val = -val;
- /*
- * If not starting on a word boundary, deal with the first
- * (partial) word.
- */
- if (bit) {
- /*
- * Compute first bit not changed and mask of relevant bits.
- */
- lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
- mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
- /*
- * Set/clear the active bits.
- */
- if (val)
- *b |= mask;
- else
- *b &= ~mask;
- i = lastbit - bit;
- /*
- * Go on to the next block if that's where the next word is
- * and we need the next word.
- */
- if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
- /*
- * Log the changed part of this block.
- * Get the next one.
- */
- xfs_trans_log_buf(tp, bp,
- (uint)((char *)first - (char *)bufp),
- (uint)((char *)b - (char *)bufp));
- error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
- if (error) {
- return error;
- }
- first = b = bufp = bp->b_addr;
- word = 0;
- } else {
- /*
- * Go on to the next word in the buffer
- */
- b++;
- }
- } else {
- /*
- * Starting on a word boundary, no partial word.
- */
- i = 0;
- }
- /*
- * Loop over whole words in buffers. When we use up one buffer
- * we move on to the next one.
- */
- while (len - i >= XFS_NBWORD) {
- /*
- * Set the word value correctly.
- */
- *b = val;
- i += XFS_NBWORD;
- /*
- * Go on to the next block if that's where the next word is
- * and we need the next word.
- */
- if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
- /*
- * Log the changed part of this block.
- * Get the next one.
- */
- xfs_trans_log_buf(tp, bp,
- (uint)((char *)first - (char *)bufp),
- (uint)((char *)b - (char *)bufp));
- error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
- if (error) {
- return error;
- }
- first = b = bufp = bp->b_addr;
- word = 0;
- } else {
- /*
- * Go on to the next word in the buffer
- */
- b++;
- }
- }
- /*
- * If not ending on a word boundary, deal with the last
- * (partial) word.
- */
- if ((lastbit = len - i)) {
- /*
- * Compute a mask of relevant bits.
- */
- bit = 0;
- mask = ((xfs_rtword_t)1 << lastbit) - 1;
- /*
- * Set/clear the active bits.
- */
- if (val)
- *b |= mask;
- else
- *b &= ~mask;
- b++;
- }
- /*
- * Log any remaining changed bytes.
- */
- if (b > first)
- xfs_trans_log_buf(tp, bp, (uint)((char *)first - (char *)bufp),
- (uint)((char *)b - (char *)bufp - 1));
- return 0;
-}
-
-/*
- * Read and modify the summary information for a given extent size,
- * bitmap block combination.
- * Keeps track of a current summary block, so we don't keep reading
- * it from the buffer cache.
- */
-STATIC int /* error */
-xfs_rtmodify_summary(
- xfs_mount_t *mp, /* file system mount point */
- xfs_trans_t *tp, /* transaction pointer */
- int log, /* log2 of extent size */
- xfs_rtblock_t bbno, /* bitmap block number */
- int delta, /* change to make to summary info */
- xfs_buf_t **rbpp, /* in/out: summary block buffer */
- xfs_fsblock_t *rsb) /* in/out: summary block number */
-{
- xfs_buf_t *bp; /* buffer for the summary block */
- int error; /* error value */
- xfs_fsblock_t sb; /* summary fsblock */
- int so; /* index into the summary file */
- xfs_suminfo_t *sp; /* pointer to returned data */
-
- /*
- * Compute entry number in the summary file.
- */
- so = XFS_SUMOFFS(mp, log, bbno);
- /*
- * Compute the block number in the summary file.
- */
- sb = XFS_SUMOFFSTOBLOCK(mp, so);
- /*
- * If we have an old buffer, and the block number matches, use that.
- */
- if (rbpp && *rbpp && *rsb == sb)
- bp = *rbpp;
- /*
- * Otherwise we have to get the buffer.
- */
- else {
- /*
- * If there was an old one, get rid of it first.
- */
- if (rbpp && *rbpp)
- xfs_trans_brelse(tp, *rbpp);
- error = xfs_rtbuf_get(mp, tp, sb, 1, &bp);
- if (error) {
- return error;
- }
- /*
- * Remember this buffer and block for the next call.
- */
- if (rbpp) {
- *rbpp = bp;
- *rsb = sb;
- }
- }
- /*
- * Point to the summary information, modify and log it.
- */
- sp = XFS_SUMPTR(mp, bp, so);
- *sp += delta;
- xfs_trans_log_buf(tp, bp, (uint)((char *)sp - (char *)bp->b_addr),
- (uint)((char *)sp - (char *)bp->b_addr + sizeof(*sp) - 1));
- return 0;
-}
-
-/*
- * Free an extent in the realtime subvolume. Length is expressed in
- * realtime extents, as is the block number.
- */
-int /* error */
-xfs_rtfree_extent(
- xfs_trans_t *tp, /* transaction pointer */
- xfs_rtblock_t bno, /* starting block number to free */
- xfs_extlen_t len) /* length of extent freed */
-{
- int error; /* error value */
- xfs_mount_t *mp; /* file system mount structure */
- xfs_fsblock_t sb; /* summary file block number */
- xfs_buf_t *sumbp; /* summary file block buffer */
-
- mp = tp->t_mountp;
-
- ASSERT(mp->m_rbmip->i_itemp != NULL);
- ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
-
-#ifdef DEBUG
- /*
- * Check to see that this whole range is currently allocated.
- */
- {
- int stat; /* result from checking range */
-
- error = xfs_rtcheck_alloc_range(mp, tp, bno, len, &stat);
- if (error) {
- return error;
- }
- ASSERT(stat);
- }
-#endif
- sumbp = NULL;
- /*
- * Free the range of realtime blocks.
- */
- error = xfs_rtfree_range(mp, tp, bno, len, &sumbp, &sb);
- if (error) {
- return error;
- }
- /*
- * Mark more blocks free in the superblock.
- */
- xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, (long)len);
- /*
- * If we've now freed all the blocks, reset the file sequence
- * number to 0.
- */
- if (tp->t_frextents_delta + mp->m_sb.sb_frextents ==
- mp->m_sb.sb_rextents) {
- if (!(mp->m_rbmip->i_d.di_flags & XFS_DIFLAG_NEWRTBM))
- mp->m_rbmip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
- *(__uint64_t *)&mp->m_rbmip->i_d.di_atime = 0;
- xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
- }
- return 0;
-}
diff --git a/libxfs/xfs_rtbitmap.c b/libxfs/xfs_rtbitmap.c
new file mode 100644
index 0000000..f24b9bd
--- /dev/null
+++ b/libxfs/xfs_rtbitmap.c
@@ -0,0 +1,951 @@
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it would 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 the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "xfs.h"
+
+/*
+ * Realtime allocator bitmap functions shared with userspace.
+ */
+
+/*
+ * Get a buffer for the bitmap or summary file block specified.
+ * The buffer is returned read and locked.
+ */
+int
+xfs_rtbuf_get(
+ xfs_mount_t *mp, /* file system mount structure */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t block, /* block number in bitmap or summary */
+ int issum, /* is summary not bitmap */
+ xfs_buf_t **bpp) /* output: buffer for the block */
+{
+ xfs_buf_t *bp; /* block buffer, result */
+ xfs_inode_t *ip; /* bitmap or summary inode */
+ xfs_bmbt_irec_t map;
+ int nmap = 1;
+ int error; /* error value */
+
+ ip = issum ? mp->m_rsumip : mp->m_rbmip;
+
+ error = xfs_bmapi_read(ip, block, 1, &map, &nmap, XFS_DATA_FORK);
+ if (error)
+ return error;
+
+ ASSERT(map.br_startblock != NULLFSBLOCK);
+ error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(mp, map.br_startblock),
+ mp->m_bsize, 0, &bp, NULL);
+ if (error)
+ return error;
+ ASSERT(!xfs_buf_geterror(bp));
+ *bpp = bp;
+ return 0;
+}
+
+/*
+ * Searching backward from start to limit, find the first block whose
+ * allocated/free state is different from start's.
+ */
+int
+xfs_rtfind_back(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t start, /* starting block to look at */
+ xfs_rtblock_t limit, /* last block to look at */
+ xfs_rtblock_t *rtblock) /* out: start block found */
+{
+ xfs_rtword_t *b; /* current word in buffer */
+ int bit; /* bit number in the word */
+ xfs_rtblock_t block; /* bitmap block number */
+ xfs_buf_t *bp; /* buf for the block */
+ xfs_rtword_t *bufp; /* starting word in buffer */
+ int error; /* error value */
+ xfs_rtblock_t firstbit; /* first useful bit in the word */
+ xfs_rtblock_t i; /* current bit number rel. to start */
+ xfs_rtblock_t len; /* length of inspected area */
+ xfs_rtword_t mask; /* mask of relevant bits for value */
+ xfs_rtword_t want; /* mask for "good" values */
+ xfs_rtword_t wdiff; /* difference from wanted value */
+ int word; /* word number in the buffer */
+
+ /*
+ * Compute and read in starting bitmap block for starting block.
+ */
+ block = XFS_BITTOBLOCK(mp, start);
+ error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ bufp = bp->b_addr;
+ /*
+ * Get the first word's index & point to it.
+ */
+ word = XFS_BITTOWORD(mp, start);
+ b = &bufp[word];
+ bit = (int)(start & (XFS_NBWORD - 1));
+ len = start - limit + 1;
+ /*
+ * Compute match value, based on the bit at start: if 1 (free)
+ * then all-ones, else all-zeroes.
+ */
+ want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
+ /*
+ * If the starting position is not word-aligned, deal with the
+ * partial word.
+ */
+ if (bit < XFS_NBWORD - 1) {
+ /*
+ * Calculate first (leftmost) bit number to look at,
+ * and mask for all the relevant bits in this word.
+ */
+ firstbit = XFS_RTMAX((xfs_srtblock_t)(bit - len + 1), 0);
+ mask = (((xfs_rtword_t)1 << (bit - firstbit + 1)) - 1) <<
+ firstbit;
+ /*
+ * Calculate the difference between the value there
+ * and what we're looking for.
+ */
+ if ((wdiff = (*b ^ want) & mask)) {
+ /*
+ * Different. Mark where we are and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i = bit - XFS_RTHIBIT(wdiff);
+ *rtblock = start - i + 1;
+ return 0;
+ }
+ i = bit - firstbit + 1;
+ /*
+ * Go on to previous block if that's where the previous word is
+ * and we need the previous word.
+ */
+ if (--word == -1 && i < len) {
+ /*
+ * If done with this block, get the previous one.
+ */
+ xfs_trans_brelse(tp, bp);
+ error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ bufp = bp->b_addr;
+ word = XFS_BLOCKWMASK(mp);
+ b = &bufp[word];
+ } else {
+ /*
+ * Go on to the previous word in the buffer.
+ */
+ b--;
+ }
+ } else {
+ /*
+ * Starting on a word boundary, no partial word.
+ */
+ i = 0;
+ }
+ /*
+ * Loop over whole words in buffers. When we use up one buffer
+ * we move on to the previous one.
+ */
+ while (len - i >= XFS_NBWORD) {
+ /*
+ * Compute difference between actual and desired value.
+ */
+ if ((wdiff = *b ^ want)) {
+ /*
+ * Different, mark where we are and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
+ *rtblock = start - i + 1;
+ return 0;
+ }
+ i += XFS_NBWORD;
+ /*
+ * Go on to previous block if that's where the previous word is
+ * and we need the previous word.
+ */
+ if (--word == -1 && i < len) {
+ /*
+ * If done with this block, get the previous one.
+ */
+ xfs_trans_brelse(tp, bp);
+ error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ bufp = bp->b_addr;
+ word = XFS_BLOCKWMASK(mp);
+ b = &bufp[word];
+ } else {
+ /*
+ * Go on to the previous word in the buffer.
+ */
+ b--;
+ }
+ }
+ /*
+ * If not ending on a word boundary, deal with the last
+ * (partial) word.
+ */
+ if (len - i) {
+ /*
+ * Calculate first (leftmost) bit number to look at,
+ * and mask for all the relevant bits in this word.
+ */
+ firstbit = XFS_NBWORD - (len - i);
+ mask = (((xfs_rtword_t)1 << (len - i)) - 1) << firstbit;
+ /*
+ * Compute difference between actual and desired value.
+ */
+ if ((wdiff = (*b ^ want) & mask)) {
+ /*
+ * Different, mark where we are and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
+ *rtblock = start - i + 1;
+ return 0;
+ } else
+ i = len;
+ }
+ /*
+ * No match, return that we scanned the whole area.
+ */
+ xfs_trans_brelse(tp, bp);
+ *rtblock = start - i + 1;
+ return 0;
+}
+
+/*
+ * Searching forward from start to limit, find the first block whose
+ * allocated/free state is different from start's.
+ */
+int
+xfs_rtfind_forw(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t start, /* starting block to look at */
+ xfs_rtblock_t limit, /* last block to look at */
+ xfs_rtblock_t *rtblock) /* out: start block found */
+{
+ xfs_rtword_t *b; /* current word in buffer */
+ int bit; /* bit number in the word */
+ xfs_rtblock_t block; /* bitmap block number */
+ xfs_buf_t *bp; /* buf for the block */
+ xfs_rtword_t *bufp; /* starting word in buffer */
+ int error; /* error value */
+ xfs_rtblock_t i; /* current bit number rel. to start */
+ xfs_rtblock_t lastbit; /* last useful bit in the word */
+ xfs_rtblock_t len; /* length of inspected area */
+ xfs_rtword_t mask; /* mask of relevant bits for value */
+ xfs_rtword_t want; /* mask for "good" values */
+ xfs_rtword_t wdiff; /* difference from wanted value */
+ int word; /* word number in the buffer */
+
+ /*
+ * Compute and read in starting bitmap block for starting block.
+ */
+ block = XFS_BITTOBLOCK(mp, start);
+ error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ bufp = bp->b_addr;
+ /*
+ * Get the first word's index & point to it.
+ */
+ word = XFS_BITTOWORD(mp, start);
+ b = &bufp[word];
+ bit = (int)(start & (XFS_NBWORD - 1));
+ len = limit - start + 1;
+ /*
+ * Compute match value, based on the bit at start: if 1 (free)
+ * then all-ones, else all-zeroes.
+ */
+ want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
+ /*
+ * If the starting position is not word-aligned, deal with the
+ * partial word.
+ */
+ if (bit) {
+ /*
+ * Calculate last (rightmost) bit number to look at,
+ * and mask for all the relevant bits in this word.
+ */
+ lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
+ mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
+ /*
+ * Calculate the difference between the value there
+ * and what we're looking for.
+ */
+ if ((wdiff = (*b ^ want) & mask)) {
+ /*
+ * Different. Mark where we are and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i = XFS_RTLOBIT(wdiff) - bit;
+ *rtblock = start + i - 1;
+ return 0;
+ }
+ i = lastbit - bit;
+ /*
+ * Go on to next block if that's where the next word is
+ * and we need the next word.
+ */
+ if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+ /*
+ * If done with this block, get the previous one.
+ */
+ xfs_trans_brelse(tp, bp);
+ error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ b = bufp = bp->b_addr;
+ word = 0;
+ } else {
+ /*
+ * Go on to the previous word in the buffer.
+ */
+ b++;
+ }
+ } else {
+ /*
+ * Starting on a word boundary, no partial word.
+ */
+ i = 0;
+ }
+ /*
+ * Loop over whole words in buffers. When we use up one buffer
+ * we move on to the next one.
+ */
+ while (len - i >= XFS_NBWORD) {
+ /*
+ * Compute difference between actual and desired value.
+ */
+ if ((wdiff = *b ^ want)) {
+ /*
+ * Different, mark where we are and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i += XFS_RTLOBIT(wdiff);
+ *rtblock = start + i - 1;
+ return 0;
+ }
+ i += XFS_NBWORD;
+ /*
+ * Go on to next block if that's where the next word is
+ * and we need the next word.
+ */
+ if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+ /*
+ * If done with this block, get the next one.
+ */
+ xfs_trans_brelse(tp, bp);
+ error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ b = bufp = bp->b_addr;
+ word = 0;
+ } else {
+ /*
+ * Go on to the next word in the buffer.
+ */
+ b++;
+ }
+ }
+ /*
+ * If not ending on a word boundary, deal with the last
+ * (partial) word.
+ */
+ if ((lastbit = len - i)) {
+ /*
+ * Calculate mask for all the relevant bits in this word.
+ */
+ mask = ((xfs_rtword_t)1 << lastbit) - 1;
+ /*
+ * Compute difference between actual and desired value.
+ */
+ if ((wdiff = (*b ^ want) & mask)) {
+ /*
+ * Different, mark where we are and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i += XFS_RTLOBIT(wdiff);
+ *rtblock = start + i - 1;
+ return 0;
+ } else
+ i = len;
+ }
+ /*
+ * No match, return that we scanned the whole area.
+ */
+ xfs_trans_brelse(tp, bp);
+ *rtblock = start + i - 1;
+ return 0;
+}
+
+/*
+ * Read and modify the summary information for a given extent size,
+ * bitmap block combination.
+ * Keeps track of a current summary block, so we don't keep reading
+ * it from the buffer cache.
+ */
+int
+xfs_rtmodify_summary(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ int log, /* log2 of extent size */
+ xfs_rtblock_t bbno, /* bitmap block number */
+ int delta, /* change to make to summary info */
+ xfs_buf_t **rbpp, /* in/out: summary block buffer */
+ xfs_fsblock_t *rsb) /* in/out: summary block number */
+{
+ xfs_buf_t *bp; /* buffer for the summary block */
+ int error; /* error value */
+ xfs_fsblock_t sb; /* summary fsblock */
+ int so; /* index into the summary file */
+ xfs_suminfo_t *sp; /* pointer to returned data */
+
+ /*
+ * Compute entry number in the summary file.
+ */
+ so = XFS_SUMOFFS(mp, log, bbno);
+ /*
+ * Compute the block number in the summary file.
+ */
+ sb = XFS_SUMOFFSTOBLOCK(mp, so);
+ /*
+ * If we have an old buffer, and the block number matches, use that.
+ */
+ if (rbpp && *rbpp && *rsb == sb)
+ bp = *rbpp;
+ /*
+ * Otherwise we have to get the buffer.
+ */
+ else {
+ /*
+ * If there was an old one, get rid of it first.
+ */
+ if (rbpp && *rbpp)
+ xfs_trans_brelse(tp, *rbpp);
+ error = xfs_rtbuf_get(mp, tp, sb, 1, &bp);
+ if (error) {
+ return error;
+ }
+ /*
+ * Remember this buffer and block for the next call.
+ */
+ if (rbpp) {
+ *rbpp = bp;
+ *rsb = sb;
+ }
+ }
+ /*
+ * Point to the summary information, modify and log it.
+ */
+ sp = XFS_SUMPTR(mp, bp, so);
+ *sp += delta;
+ xfs_trans_log_buf(tp, bp, (uint)((char *)sp - (char *)bp->b_addr),
+ (uint)((char *)sp - (char *)bp->b_addr + sizeof(*sp) - 1));
+ return 0;
+}
+
+/*
+ * Set the given range of bitmap bits to the given value.
+ * Do whatever I/O and logging is required.
+ */
+int
+xfs_rtmodify_range(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t start, /* starting block to modify */
+ xfs_extlen_t len, /* length of extent to modify */
+ int val) /* 1 for free, 0 for allocated */
+{
+ xfs_rtword_t *b; /* current word in buffer */
+ int bit; /* bit number in the word */
+ xfs_rtblock_t block; /* bitmap block number */
+ xfs_buf_t *bp; /* buf for the block */
+ xfs_rtword_t *bufp; /* starting word in buffer */
+ int error; /* error value */
+ xfs_rtword_t *first; /* first used word in the buffer */
+ int i; /* current bit number rel. to start */
+ int lastbit; /* last useful bit in word */
+ xfs_rtword_t mask; /* mask o frelevant bits for value */
+ int word; /* word number in the buffer */
+
+ /*
+ * Compute starting bitmap block number.
+ */
+ block = XFS_BITTOBLOCK(mp, start);
+ /*
+ * Read the bitmap block, and point to its data.
+ */
+ error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ bufp = bp->b_addr;
+ /*
+ * Compute the starting word's address, and starting bit.
+ */
+ word = XFS_BITTOWORD(mp, start);
+ first = b = &bufp[word];
+ bit = (int)(start & (XFS_NBWORD - 1));
+ /*
+ * 0 (allocated) => all zeroes; 1 (free) => all ones.
+ */
+ val = -val;
+ /*
+ * If not starting on a word boundary, deal with the first
+ * (partial) word.
+ */
+ if (bit) {
+ /*
+ * Compute first bit not changed and mask of relevant bits.
+ */
+ lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
+ mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
+ /*
+ * Set/clear the active bits.
+ */
+ if (val)
+ *b |= mask;
+ else
+ *b &= ~mask;
+ i = lastbit - bit;
+ /*
+ * Go on to the next block if that's where the next word is
+ * and we need the next word.
+ */
+ if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+ /*
+ * Log the changed part of this block.
+ * Get the next one.
+ */
+ xfs_trans_log_buf(tp, bp,
+ (uint)((char *)first - (char *)bufp),
+ (uint)((char *)b - (char *)bufp));
+ error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ first = b = bufp = bp->b_addr;
+ word = 0;
+ } else {
+ /*
+ * Go on to the next word in the buffer
+ */
+ b++;
+ }
+ } else {
+ /*
+ * Starting on a word boundary, no partial word.
+ */
+ i = 0;
+ }
+ /*
+ * Loop over whole words in buffers. When we use up one buffer
+ * we move on to the next one.
+ */
+ while (len - i >= XFS_NBWORD) {
+ /*
+ * Set the word value correctly.
+ */
+ *b = val;
+ i += XFS_NBWORD;
+ /*
+ * Go on to the next block if that's where the next word is
+ * and we need the next word.
+ */
+ if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+ /*
+ * Log the changed part of this block.
+ * Get the next one.
+ */
+ xfs_trans_log_buf(tp, bp,
+ (uint)((char *)first - (char *)bufp),
+ (uint)((char *)b - (char *)bufp));
+ error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ first = b = bufp = bp->b_addr;
+ word = 0;
+ } else {
+ /*
+ * Go on to the next word in the buffer
+ */
+ b++;
+ }
+ }
+ /*
+ * If not ending on a word boundary, deal with the last
+ * (partial) word.
+ */
+ if ((lastbit = len - i)) {
+ /*
+ * Compute a mask of relevant bits.
+ */
+ bit = 0;
+ mask = ((xfs_rtword_t)1 << lastbit) - 1;
+ /*
+ * Set/clear the active bits.
+ */
+ if (val)
+ *b |= mask;
+ else
+ *b &= ~mask;
+ b++;
+ }
+ /*
+ * Log any remaining changed bytes.
+ */
+ if (b > first)
+ xfs_trans_log_buf(tp, bp, (uint)((char *)first - (char *)bufp),
+ (uint)((char *)b - (char *)bufp - 1));
+ return 0;
+}
+
+/*
+ * Mark an extent specified by start and len freed.
+ * Updates all the summary information as well as the bitmap.
+ */
+int
+xfs_rtfree_range(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t start, /* starting block to free */
+ xfs_extlen_t len, /* length to free */
+ xfs_buf_t **rbpp, /* in/out: summary block buffer */
+ xfs_fsblock_t *rsb) /* in/out: summary block number */
+{
+ xfs_rtblock_t end; /* end of the freed extent */
+ int error; /* error value */
+ xfs_rtblock_t postblock; /* first block freed > end */
+ xfs_rtblock_t preblock; /* first block freed < start */
+
+ end = start + len - 1;
+ /*
+ * Modify the bitmap to mark this extent freed.
+ */
+ error = xfs_rtmodify_range(mp, tp, start, len, 1);
+ if (error) {
+ return error;
+ }
+ /*
+ * Assume we're freeing out of the middle of an allocated extent.
+ * We need to find the beginning and end of the extent so we can
+ * properly update the summary.
+ */
+ error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
+ if (error) {
+ return error;
+ }
+ /*
+ * Find the next allocated block (end of allocated extent).
+ */
+ error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
+ &postblock);
+ if (error)
+ return error;
+ /*
+ * If there are blocks not being freed at the front of the
+ * old extent, add summary data for them to be allocated.
+ */
+ if (preblock < start) {
+ error = xfs_rtmodify_summary(mp, tp,
+ XFS_RTBLOCKLOG(start - preblock),
+ XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
+ if (error) {
+ return error;
+ }
+ }
+ /*
+ * If there are blocks not being freed at the end of the
+ * old extent, add summary data for them to be allocated.
+ */
+ if (postblock > end) {
+ error = xfs_rtmodify_summary(mp, tp,
+ XFS_RTBLOCKLOG(postblock - end),
+ XFS_BITTOBLOCK(mp, end + 1), -1, rbpp, rsb);
+ if (error) {
+ return error;
+ }
+ }
+ /*
+ * Increment the summary information corresponding to the entire
+ * (new) free extent.
+ */
+ error = xfs_rtmodify_summary(mp, tp,
+ XFS_RTBLOCKLOG(postblock + 1 - preblock),
+ XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
+ return error;
+}
+
+/*
+ * Check that the given range is either all allocated (val = 0) or
+ * all free (val = 1).
+ */
+int
+xfs_rtcheck_range(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t start, /* starting block number of extent */
+ xfs_extlen_t len, /* length of extent */
+ int val, /* 1 for free, 0 for allocated */
+ xfs_rtblock_t *new, /* out: first block not matching */
+ int *stat) /* out: 1 for matches, 0 for not */
+{
+ xfs_rtword_t *b; /* current word in buffer */
+ int bit; /* bit number in the word */
+ xfs_rtblock_t block; /* bitmap block number */
+ xfs_buf_t *bp; /* buf for the block */
+ xfs_rtword_t *bufp; /* starting word in buffer */
+ int error; /* error value */
+ xfs_rtblock_t i; /* current bit number rel. to start */
+ xfs_rtblock_t lastbit; /* last useful bit in word */
+ xfs_rtword_t mask; /* mask of relevant bits for value */
+ xfs_rtword_t wdiff; /* difference from wanted value */
+ int word; /* word number in the buffer */
+
+ /*
+ * Compute starting bitmap block number
+ */
+ block = XFS_BITTOBLOCK(mp, start);
+ /*
+ * Read the bitmap block.
+ */
+ error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ bufp = bp->b_addr;
+ /*
+ * Compute the starting word's address, and starting bit.
+ */
+ word = XFS_BITTOWORD(mp, start);
+ b = &bufp[word];
+ bit = (int)(start & (XFS_NBWORD - 1));
+ /*
+ * 0 (allocated) => all zero's; 1 (free) => all one's.
+ */
+ val = -val;
+ /*
+ * If not starting on a word boundary, deal with the first
+ * (partial) word.
+ */
+ if (bit) {
+ /*
+ * Compute first bit not examined.
+ */
+ lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
+ /*
+ * Mask of relevant bits.
+ */
+ mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
+ /*
+ * Compute difference between actual and desired value.
+ */
+ if ((wdiff = (*b ^ val) & mask)) {
+ /*
+ * Different, compute first wrong bit and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i = XFS_RTLOBIT(wdiff) - bit;
+ *new = start + i;
+ *stat = 0;
+ return 0;
+ }
+ i = lastbit - bit;
+ /*
+ * Go on to next block if that's where the next word is
+ * and we need the next word.
+ */
+ if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+ /*
+ * If done with this block, get the next one.
+ */
+ xfs_trans_brelse(tp, bp);
+ error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ b = bufp = bp->b_addr;
+ word = 0;
+ } else {
+ /*
+ * Go on to the next word in the buffer.
+ */
+ b++;
+ }
+ } else {
+ /*
+ * Starting on a word boundary, no partial word.
+ */
+ i = 0;
+ }
+ /*
+ * Loop over whole words in buffers. When we use up one buffer
+ * we move on to the next one.
+ */
+ while (len - i >= XFS_NBWORD) {
+ /*
+ * Compute difference between actual and desired value.
+ */
+ if ((wdiff = *b ^ val)) {
+ /*
+ * Different, compute first wrong bit and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i += XFS_RTLOBIT(wdiff);
+ *new = start + i;
+ *stat = 0;
+ return 0;
+ }
+ i += XFS_NBWORD;
+ /*
+ * Go on to next block if that's where the next word is
+ * and we need the next word.
+ */
+ if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
+ /*
+ * If done with this block, get the next one.
+ */
+ xfs_trans_brelse(tp, bp);
+ error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
+ if (error) {
+ return error;
+ }
+ b = bufp = bp->b_addr;
+ word = 0;
+ } else {
+ /*
+ * Go on to the next word in the buffer.
+ */
+ b++;
+ }
+ }
+ /*
+ * If not ending on a word boundary, deal with the last
+ * (partial) word.
+ */
+ if ((lastbit = len - i)) {
+ /*
+ * Mask of relevant bits.
+ */
+ mask = ((xfs_rtword_t)1 << lastbit) - 1;
+ /*
+ * Compute difference between actual and desired value.
+ */
+ if ((wdiff = (*b ^ val) & mask)) {
+ /*
+ * Different, compute first wrong bit and return.
+ */
+ xfs_trans_brelse(tp, bp);
+ i += XFS_RTLOBIT(wdiff);
+ *new = start + i;
+ *stat = 0;
+ return 0;
+ } else
+ i = len;
+ }
+ /*
+ * Successful, return.
+ */
+ xfs_trans_brelse(tp, bp);
+ *new = start + i;
+ *stat = 1;
+ return 0;
+}
+
+#ifdef DEBUG
+/*
+ * Check that the given extent (block range) is allocated already.
+ */
+STATIC int /* error */
+xfs_rtcheck_alloc_range(
+ xfs_mount_t *mp, /* file system mount point */
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t bno, /* starting block number of extent */
+ xfs_extlen_t len) /* length of extent */
+{
+ xfs_rtblock_t new; /* dummy for xfs_rtcheck_range */
+ int stat;
+ int error;
+
+ error = xfs_rtcheck_range(mp, tp, bno, len, 0, &new, &stat);
+ if (error)
+ return error;
+ ASSERT(stat);
+ return 0;
+}
+#else
+#define xfs_rtcheck_alloc_range(m,t,b,l) (0)
+#endif
+/*
+ * Free an extent in the realtime subvolume. Length is expressed in
+ * realtime extents, as is the block number.
+ */
+int /* error */
+xfs_rtfree_extent(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_rtblock_t bno, /* starting block number to free */
+ xfs_extlen_t len) /* length of extent freed */
+{
+ int error; /* error value */
+ xfs_mount_t *mp; /* file system mount structure */
+ xfs_fsblock_t sb; /* summary file block number */
+ xfs_buf_t *sumbp = NULL; /* summary file block buffer */
+
+ mp = tp->t_mountp;
+
+ ASSERT(mp->m_rbmip->i_itemp != NULL);
+ ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
+
+ error = xfs_rtcheck_alloc_range(mp, tp, bno, len);
+ if (error)
+ return error;
+
+ /*
+ * Free the range of realtime blocks.
+ */
+ error = xfs_rtfree_range(mp, tp, bno, len, &sumbp, &sb);
+ if (error) {
+ return error;
+ }
+ /*
+ * Mark more blocks free in the superblock.
+ */
+ xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, (long)len);
+ /*
+ * If we've now freed all the blocks, reset the file sequence
+ * number to 0.
+ */
+ if (tp->t_frextents_delta + mp->m_sb.sb_frextents ==
+ mp->m_sb.sb_rextents) {
+ if (!(mp->m_rbmip->i_d.di_flags & XFS_DIFLAG_NEWRTBM))
+ mp->m_rbmip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
+ *(__uint64_t *)&mp->m_rbmip->i_d.di_atime = 0;
+ xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
+ }
+ return 0;
+}
+
--
1.8.4.rc3
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