xfs: simplify xfs_rtbuf_get calling conventions

Source kernel commit: 5b1d0ae9753f0654ab56c1e06155b3abf2919d71

Now that xfs_rtalloc_args holds references to the last-read bitmap and
summary blocks, we don't need to pass the buffer pointer out of
xfs_rtbuf_get.

Callers no longer have to xfs_trans_brelse on their own, though they are
required to call xfs_rtbuf_cache_relse before the xfs_rtalloc_args goes
out of scope.

While we're at it, create some trivial helpers so that we don't have to
remember if "0" means "bitmap" and "1" means "summary".

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Carlos Maiolino <cem@kernel.org>

diff --git a/libxfs/xfs_rtbitmap.c b/libxfs/xfs_rtbitmap.c
index e9c70ff884a3e7a923c4c63ed5ddf449430dc07b..bc3ce7bce29cfb9f84648ceaac1554512f33f612 100644 (file)
--- a/libxfs/xfs_rtbitmap.c
+++ b/libxfs/xfs_rtbitmap.c
@@ -70,8 +70,7 @@ int
 xfs_rtbuf_get(
        struct xfs_rtalloc_args *args,
        xfs_fileoff_t           block,  /* block number in bitmap or summary */
-       int                     issum,  /* is summary not bitmap */
-       struct xfs_buf          **bpp)  /* output: buffer for the block */
+       int                     issum)  /* is summary not bitmap */
 {
        struct xfs_mount        *mp = args->mp;
        struct xfs_buf          **cbpp; /* cached block buffer */
@@ -98,10 +97,9 @@ xfs_rtbuf_get(
        /*
         * If we have a cached buffer, and the block number matches, use that.
         */
-       if (*cbpp && *coffp == block) {
-               *bpp = *cbpp;
+       if (*cbpp && *coffp == block)
                return 0;
-       }
+
        /*
         * Otherwise we have to have to get the buffer.  If there was an old
         * one, get rid of it first.
@@ -126,7 +124,7 @@ xfs_rtbuf_get(
                return error;
 
        xfs_trans_buf_set_type(args->tp, bp, type);
-       *cbpp = *bpp = bp;
+       *cbpp = bp;
        *coffp = block;
        return 0;
 }
@@ -145,7 +143,6 @@ xfs_rtfind_back(
        struct xfs_mount        *mp = args->mp;
        int                     bit;    /* bit number in the word */
        xfs_fileoff_t           block;  /* bitmap block number */
-       struct xfs_buf          *bp;    /* buf for the block */
        int                     error;  /* error value */
        xfs_rtxnum_t            firstbit; /* first useful bit in the word */
        xfs_rtxnum_t            i;      /* current bit number rel. to start */
@@ -160,10 +157,9 @@ xfs_rtfind_back(
         * Compute and read in starting bitmap block for starting block.
         */
        block = xfs_rtx_to_rbmblock(mp, start);
-       error = xfs_rtbuf_get(args, block, 0, &bp);
-       if (error) {
+       error = xfs_rtbitmap_read_buf(args, block);
+       if (error)
                return error;
-       }
 
        /*
         * Get the first word's index & point to it.
@@ -175,7 +171,7 @@ xfs_rtfind_back(
         * Compute match value, based on the bit at start: if 1 (free)
         * then all-ones, else all-zeroes.
         */
-       incore = xfs_rtbitmap_getword(bp, word);
+       incore = xfs_rtbitmap_getword(args->rbmbp, word);
        want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
        /*
         * If the starting position is not word-aligned, deal with the
@@ -210,10 +206,9 @@ xfs_rtfind_back(
                        /*
                         * If done with this block, get the previous one.
                         */
-                       error = xfs_rtbuf_get(args, --block, 0, &bp);
-                       if (error) {
+                       error = xfs_rtbitmap_read_buf(args, --block);
+                       if (error)
                                return error;
-                       }
 
                        word = mp->m_blockwsize - 1;
                }
@@ -231,7 +226,7 @@ xfs_rtfind_back(
                /*
                 * Compute difference between actual and desired value.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if ((wdiff = incore ^ want)) {
                        /*
                         * Different, mark where we are and return.
@@ -249,10 +244,9 @@ xfs_rtfind_back(
                        /*
                         * If done with this block, get the previous one.
                         */
-                       error = xfs_rtbuf_get(args, --block, 0, &bp);
-                       if (error) {
+                       error = xfs_rtbitmap_read_buf(args, --block);
+                       if (error)
                                return error;
-                       }
 
                        word = mp->m_blockwsize - 1;
                }
@@ -271,7 +265,7 @@ xfs_rtfind_back(
                /*
                 * Compute difference between actual and desired value.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if ((wdiff = (incore ^ want) & mask)) {
                        /*
                         * Different, mark where we are and return.
@@ -303,7 +297,6 @@ xfs_rtfind_forw(
        struct xfs_mount        *mp = args->mp;
        int                     bit;    /* bit number in the word */
        xfs_fileoff_t           block;  /* bitmap block number */
-       struct xfs_buf          *bp;    /* buf for the block */
        int                     error;
        xfs_rtxnum_t            i;      /* current bit number rel. to start */
        xfs_rtxnum_t            lastbit;/* last useful bit in the word */
@@ -318,10 +311,9 @@ xfs_rtfind_forw(
         * Compute and read in starting bitmap block for starting block.
         */
        block = xfs_rtx_to_rbmblock(mp, start);
-       error = xfs_rtbuf_get(args, block, 0, &bp);
-       if (error) {
+       error = xfs_rtbitmap_read_buf(args, block);
+       if (error)
                return error;
-       }
 
        /*
         * Get the first word's index & point to it.
@@ -333,7 +325,7 @@ xfs_rtfind_forw(
         * Compute match value, based on the bit at start: if 1 (free)
         * then all-ones, else all-zeroes.
         */
-       incore = xfs_rtbitmap_getword(bp, word);
+       incore = xfs_rtbitmap_getword(args->rbmbp, word);
        want = (incore & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
        /*
         * If the starting position is not word-aligned, deal with the
@@ -367,10 +359,9 @@ xfs_rtfind_forw(
                        /*
                         * If done with this block, get the previous one.
                         */
-                       error = xfs_rtbuf_get(args, ++block, 0, &bp);
-                       if (error) {
+                       error = xfs_rtbitmap_read_buf(args, ++block);
+                       if (error)
                                return error;
-                       }
 
                        word = 0;
                }
@@ -388,7 +379,7 @@ xfs_rtfind_forw(
                /*
                 * Compute difference between actual and desired value.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if ((wdiff = incore ^ want)) {
                        /*
                         * Different, mark where we are and return.
@@ -406,10 +397,9 @@ xfs_rtfind_forw(
                        /*
                         * If done with this block, get the next one.
                         */
-                       error = xfs_rtbuf_get(args, ++block, 0, &bp);
-                       if (error) {
+                       error = xfs_rtbitmap_read_buf(args, ++block);
+                       if (error)
                                return error;
-                       }
 
                        word = 0;
                }
@@ -426,7 +416,7 @@ xfs_rtfind_forw(
                /*
                 * Compute difference between actual and desired value.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if ((wdiff = (incore ^ want) & mask)) {
                        /*
                         * Different, mark where we are and return.
@@ -477,7 +467,6 @@ xfs_rtmodify_summary_int(
        xfs_suminfo_t           *sum)   /* out: summary info for this block */
 {
        struct xfs_mount        *mp = args->mp;
-       struct xfs_buf          *bp;    /* buffer for the summary block */
        int                     error;
        xfs_fileoff_t           sb;     /* summary fsblock */
        xfs_rtsumoff_t          so;     /* index into the summary file */
@@ -492,7 +481,7 @@ xfs_rtmodify_summary_int(
         */
        sb = xfs_rtsumoffs_to_block(mp, so);
 
-       error = xfs_rtbuf_get(args, sb, 1, &bp);
+       error = xfs_rtsummary_read_buf(args, sb);
        if (error)
                return error;
 
@@ -501,7 +490,8 @@ xfs_rtmodify_summary_int(
         */
        infoword = xfs_rtsumoffs_to_infoword(mp, so);
        if (delta) {
-               xfs_suminfo_t   val = xfs_suminfo_add(bp, infoword, delta);
+               xfs_suminfo_t   val = xfs_suminfo_add(args->sumbp, infoword,
+                                                     delta);
 
                if (mp->m_rsum_cache) {
                        if (val == 0 && log == mp->m_rsum_cache[bbno])
@@ -509,11 +499,11 @@ xfs_rtmodify_summary_int(
                        if (val != 0 && log < mp->m_rsum_cache[bbno])
                                mp->m_rsum_cache[bbno] = log;
                }
-               xfs_trans_log_rtsummary(args->tp, bp, infoword);
+               xfs_trans_log_rtsummary(args->tp, args->sumbp, infoword);
                if (sum)
                        *sum = val;
        } else if (sum) {
-               *sum = xfs_suminfo_get(bp, infoword);
+               *sum = xfs_suminfo_get(args->sumbp, infoword);
        }
        return 0;
 }
@@ -558,7 +548,6 @@ xfs_rtmodify_range(
        struct xfs_mount        *mp = args->mp;
        int                     bit;    /* bit number in the word */
        xfs_fileoff_t           block;  /* bitmap block number */
-       struct xfs_buf          *bp;    /* buf for the block */
        int                     error;
        int                     i;      /* current bit number rel. to start */
        int                     lastbit; /* last useful bit in word */
@@ -574,10 +563,9 @@ xfs_rtmodify_range(
        /*
         * Read the bitmap block, and point to its data.
         */
-       error = xfs_rtbuf_get(args, block, 0, &bp);
-       if (error) {
+       error = xfs_rtbitmap_read_buf(args, block);
+       if (error)
                return error;
-       }
 
        /*
         * Compute the starting word's address, and starting bit.
@@ -601,12 +589,12 @@ xfs_rtmodify_range(
                /*
                 * Set/clear the active bits.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if (val)
                        incore |= mask;
                else
                        incore &= ~mask;
-               xfs_rtbitmap_setword(bp, word, incore);
+               xfs_rtbitmap_setword(args->rbmbp, word, incore);
                i = lastbit - bit;
                /*
                 * Go on to the next block if that's where the next word is
@@ -617,12 +605,11 @@ xfs_rtmodify_range(
                         * Log the changed part of this block.
                         * Get the next one.
                         */
-                       xfs_trans_log_rtbitmap(args->tp, bp, firstword,
+                       xfs_trans_log_rtbitmap(args->tp, args->rbmbp, firstword,
                                        word);
-                       error = xfs_rtbuf_get(args, ++block, 0, &bp);
-                       if (error) {
+                       error = xfs_rtbitmap_read_buf(args, ++block);
+                       if (error)
                                return error;
-                       }
 
                        firstword = word = 0;
                }
@@ -640,7 +627,7 @@ xfs_rtmodify_range(
                /*
                 * Set the word value correctly.
                 */
-               xfs_rtbitmap_setword(bp, word, val);
+               xfs_rtbitmap_setword(args->rbmbp, word, val);
                i += XFS_NBWORD;
                /*
                 * Go on to the next block if that's where the next word is
@@ -651,9 +638,9 @@ xfs_rtmodify_range(
                         * Log the changed part of this block.
                         * Get the next one.
                         */
-                       xfs_trans_log_rtbitmap(args->tp, bp, firstword,
+                       xfs_trans_log_rtbitmap(args->tp, args->rbmbp, firstword,
                                        word);
-                       error = xfs_rtbuf_get(args, ++block, 0, &bp);
+                       error = xfs_rtbitmap_read_buf(args, ++block);
                        if (error)
                                return error;
 
@@ -672,19 +659,19 @@ xfs_rtmodify_range(
                /*
                 * Set/clear the active bits.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if (val)
                        incore |= mask;
                else
                        incore &= ~mask;
-               xfs_rtbitmap_setword(bp, word, incore);
+               xfs_rtbitmap_setword(args->rbmbp, word, incore);
                word++;
        }
        /*
         * Log any remaining changed bytes.
         */
        if (word > firstword)
-               xfs_trans_log_rtbitmap(args->tp, bp, firstword, word);
+               xfs_trans_log_rtbitmap(args->tp, args->rbmbp, firstword, word);
        return 0;
 }
 
@@ -777,7 +764,6 @@ xfs_rtcheck_range(
        struct xfs_mount        *mp = args->mp;
        int                     bit;    /* bit number in the word */
        xfs_fileoff_t           block;  /* bitmap block number */
-       struct xfs_buf          *bp;    /* buf for the block */
        int                     error;
        xfs_rtxnum_t            i;      /* current bit number rel. to start */
        xfs_rtxnum_t            lastbit; /* last useful bit in word */
@@ -793,10 +779,9 @@ xfs_rtcheck_range(
        /*
         * Read the bitmap block.
         */
-       error = xfs_rtbuf_get(args, block, 0, &bp);
-       if (error) {
+       error = xfs_rtbitmap_read_buf(args, block);
+       if (error)
                return error;
-       }
 
        /*
         * Compute the starting word's address, and starting bit.
@@ -823,7 +808,7 @@ xfs_rtcheck_range(
                /*
                 * Compute difference between actual and desired value.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if ((wdiff = (incore ^ val) & mask)) {
                        /*
                         * Different, compute first wrong bit and return.
@@ -842,10 +827,9 @@ xfs_rtcheck_range(
                        /*
                         * If done with this block, get the next one.
                         */
-                       error = xfs_rtbuf_get(args, ++block, 0, &bp);
-                       if (error) {
+                       error = xfs_rtbitmap_read_buf(args, ++block);
+                       if (error)
                                return error;
-                       }
 
                        word = 0;
                }
@@ -863,7 +847,7 @@ xfs_rtcheck_range(
                /*
                 * Compute difference between actual and desired value.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if ((wdiff = incore ^ val)) {
                        /*
                         * Different, compute first wrong bit and return.
@@ -882,10 +866,9 @@ xfs_rtcheck_range(
                        /*
                         * If done with this block, get the next one.
                         */
-                       error = xfs_rtbuf_get(args, ++block, 0, &bp);
-                       if (error) {
+                       error = xfs_rtbitmap_read_buf(args, ++block);
+                       if (error)
                                return error;
-                       }
 
                        word = 0;
                }
@@ -902,7 +885,7 @@ xfs_rtcheck_range(
                /*
                 * Compute difference between actual and desired value.
                 */
-               incore = xfs_rtbitmap_getword(bp, word);
+               incore = xfs_rtbitmap_getword(args->rbmbp, word);
                if ((wdiff = (incore ^ val) & mask)) {
                        /*
                         * Different, compute first wrong bit and return.

diff --git a/libxfs/xfs_rtbitmap.h b/libxfs/xfs_rtbitmap.h
index ac8cd141275e2179a2acc1cc51ff97bdfd9cf222..b5505da7aa58ae6421dee7d11b2595571d30535d 100644 (file)
--- a/libxfs/xfs_rtbitmap.h
+++ b/libxfs/xfs_rtbitmap.h
@@ -298,7 +298,24 @@ typedef int (*xfs_rtalloc_query_range_fn)(
 void xfs_rtbuf_cache_relse(struct xfs_rtalloc_args *args);
 
 int xfs_rtbuf_get(struct xfs_rtalloc_args *args, xfs_fileoff_t block,
-               int issum, struct xfs_buf **bpp);
+               int issum);
+
+static inline int
+xfs_rtbitmap_read_buf(
+       struct xfs_rtalloc_args         *args,
+       xfs_fileoff_t                   block)
+{
+       return xfs_rtbuf_get(args, block, 0);
+}
+
+static inline int
+xfs_rtsummary_read_buf(
+       struct xfs_rtalloc_args         *args,
+       xfs_fileoff_t                   block)
+{
+       return xfs_rtbuf_get(args, block, 1);
+}
+
 int xfs_rtcheck_range(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
                xfs_rtxlen_t len, int val, xfs_rtxnum_t *new, int *stat);
 int xfs_rtfind_back(struct xfs_rtalloc_args *args, xfs_rtxnum_t start,
@@ -351,7 +368,8 @@ unsigned long long xfs_rtsummary_wordcount(struct xfs_mount *mp,
 # define xfs_rtfree_blocks(t,rb,rl)                    (-ENOSYS)
 # define xfs_rtalloc_query_range(m,t,l,h,f,p)          (-ENOSYS)
 # define xfs_rtalloc_query_all(m,t,f,p)                        (-ENOSYS)
-# define xfs_rtbuf_get(m,t,b,i,p)                      (-ENOSYS)
+# define xfs_rtbitmap_read_buf(a,b)                    (-ENOSYS)
+# define xfs_rtsummary_read_buf(a,b)                   (-ENOSYS)
 # define xfs_rtbuf_cache_relse(a)                      (0)
 # define xfs_rtalloc_extent_is_free(m,t,s,l,i)         (-ENOSYS)
 static inline xfs_filblks_t