From: "Darrick J. Wong" <djwong@xxxxxxxxxx>
Source kernel commit: a9948626849c2c65dfd201b5e9d855e62937de61
There are a bunch of places where we use open-coded logic to find a
pointer to an xfs_rtword_t within a rt bitmap buffer. Convert all that
to helper functions for better type safety.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Carlos Maiolino <cem@xxxxxxxxxx>
---
libxfs/xfs_rtbitmap.c | 59 +++++++++++++++++++++++--------------------
libxfs/xfs_rtbitmap.h | 11 ++++++++
2 files changed, 42 insertions(+), 28 deletions(-)
diff --git a/libxfs/xfs_rtbitmap.c b/libxfs/xfs_rtbitmap.c
index 6776e45c1..fce88c759 100644
--- a/libxfs/xfs_rtbitmap.c
+++ b/libxfs/xfs_rtbitmap.c
@@ -101,7 +101,6 @@ xfs_rtfind_back(
int bit; /* bit number in the word */
xfs_fileoff_t block; /* bitmap block number */
struct xfs_buf *bp; /* buf for the block */
- xfs_rtword_t *bufp; /* starting word in buffer */
int error; /* error value */
xfs_rtxnum_t firstbit; /* first useful bit in the word */
xfs_rtxnum_t i; /* current bit number rel. to start */
@@ -119,12 +118,12 @@ xfs_rtfind_back(
if (error) {
return error;
}
- bufp = bp->b_addr;
+
/*
* Get the first word's index & point to it.
*/
word = xfs_rtx_to_rbmword(mp, start);
- b = &bufp[word];
+ b = xfs_rbmblock_wordptr(bp, word);
bit = (int)(start & (XFS_NBWORD - 1));
len = start - limit + 1;
/*
@@ -171,9 +170,9 @@ xfs_rtfind_back(
if (error) {
return error;
}
- bufp = bp->b_addr;
+
word = mp->m_blockwsize - 1;
- b = &bufp[word];
+ b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the previous word in the buffer.
@@ -217,9 +216,9 @@ xfs_rtfind_back(
if (error) {
return error;
}
- bufp = bp->b_addr;
+
word = mp->m_blockwsize - 1;
- b = &bufp[word];
+ b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the previous word in the buffer.
@@ -276,7 +275,6 @@ xfs_rtfind_forw(
int bit; /* bit number in the word */
xfs_fileoff_t block; /* bitmap block number */
struct xfs_buf *bp; /* buf for the block */
- xfs_rtword_t *bufp; /* starting word in buffer */
int error; /* error value */
xfs_rtxnum_t i; /* current bit number rel. to start */
xfs_rtxnum_t lastbit; /* last useful bit in the word */
@@ -294,12 +292,12 @@ xfs_rtfind_forw(
if (error) {
return error;
}
- bufp = bp->b_addr;
+
/*
* Get the first word's index & point to it.
*/
word = xfs_rtx_to_rbmword(mp, start);
- b = &bufp[word];
+ b = xfs_rbmblock_wordptr(bp, word);
bit = (int)(start & (XFS_NBWORD - 1));
len = limit - start + 1;
/*
@@ -345,8 +343,9 @@ xfs_rtfind_forw(
if (error) {
return error;
}
- b = bufp = bp->b_addr;
+
word = 0;
+ b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the previous word in the buffer.
@@ -390,8 +389,9 @@ xfs_rtfind_forw(
if (error) {
return error;
}
- b = bufp = bp->b_addr;
+
word = 0;
+ b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the next word in the buffer.
@@ -539,7 +539,6 @@ xfs_rtmodify_range(
int bit; /* bit number in the word */
xfs_fileoff_t block; /* bitmap block number */
struct xfs_buf *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 */
@@ -558,12 +557,12 @@ xfs_rtmodify_range(
if (error) {
return error;
}
- bufp = bp->b_addr;
+
/*
* Compute the starting word's address, and starting bit.
*/
word = xfs_rtx_to_rbmword(mp, start);
- first = b = &bufp[word];
+ first = b = xfs_rbmblock_wordptr(bp, word);
bit = (int)(start & (XFS_NBWORD - 1));
/*
* 0 (allocated) => all zeroes; 1 (free) => all ones.
@@ -597,14 +596,15 @@ xfs_rtmodify_range(
* Get the next one.
*/
xfs_trans_log_buf(tp, bp,
- (uint)((char *)first - (char *)bufp),
- (uint)((char *)b - (char *)bufp));
+ (uint)((char *)first - (char *)bp->b_addr),
+ (uint)((char *)b - (char *)bp->b_addr));
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
- first = b = bufp = bp->b_addr;
+
word = 0;
+ first = b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the next word in the buffer
@@ -637,14 +637,15 @@ xfs_rtmodify_range(
* Get the next one.
*/
xfs_trans_log_buf(tp, bp,
- (uint)((char *)first - (char *)bufp),
- (uint)((char *)b - (char *)bufp));
+ (uint)((char *)first - (char *)bp->b_addr),
+ (uint)((char *)b - (char *)bp->b_addr));
error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
if (error) {
return error;
}
- first = b = bufp = bp->b_addr;
+
word = 0;
+ first = b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the next word in the buffer
@@ -674,8 +675,9 @@ xfs_rtmodify_range(
* 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));
+ xfs_trans_log_buf(tp, bp,
+ (uint)((char *)first - (char *)bp->b_addr),
+ (uint)((char *)b - (char *)bp->b_addr - 1));
return 0;
}
@@ -773,7 +775,6 @@ xfs_rtcheck_range(
int bit; /* bit number in the word */
xfs_fileoff_t block; /* bitmap block number */
struct xfs_buf *bp; /* buf for the block */
- xfs_rtword_t *bufp; /* starting word in buffer */
int error; /* error value */
xfs_rtxnum_t i; /* current bit number rel. to start */
xfs_rtxnum_t lastbit; /* last useful bit in word */
@@ -792,12 +793,12 @@ xfs_rtcheck_range(
if (error) {
return error;
}
- bufp = bp->b_addr;
+
/*
* Compute the starting word's address, and starting bit.
*/
word = xfs_rtx_to_rbmword(mp, start);
- b = &bufp[word];
+ b = xfs_rbmblock_wordptr(bp, word);
bit = (int)(start & (XFS_NBWORD - 1));
/*
* 0 (allocated) => all zero's; 1 (free) => all one's.
@@ -843,8 +844,9 @@ xfs_rtcheck_range(
if (error) {
return error;
}
- b = bufp = bp->b_addr;
+
word = 0;
+ b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the next word in the buffer.
@@ -889,8 +891,9 @@ xfs_rtcheck_range(
if (error) {
return error;
}
- b = bufp = bp->b_addr;
+
word = 0;
+ b = xfs_rbmblock_wordptr(bp, word);
} else {
/*
* Go on to the next word in the buffer.
diff --git a/libxfs/xfs_rtbitmap.h b/libxfs/xfs_rtbitmap.h
index a382b38c6..3252ed217 100644
--- a/libxfs/xfs_rtbitmap.h
+++ b/libxfs/xfs_rtbitmap.h
@@ -158,6 +158,17 @@ xfs_rbmblock_to_rtx(
return rbmoff << mp->m_blkbit_log;
}
+/* Return a pointer to a bitmap word within a rt bitmap block. */
+static inline xfs_rtword_t *
+xfs_rbmblock_wordptr(
+ struct xfs_buf *bp,
+ unsigned int index)
+{
+ xfs_rtword_t *words = bp->b_addr;
+
+ return words + index;
+}
+
/*
* Functions for walking free space rtextents in the realtime bitmap.
*/
--
2.43.0
