fsx/fsstress: round blocksize properly

The block sizes reported by stat and DIOINFO aren't required to be
powers of two.  This can happen on an XFS filesystem with a realtime
extent size that isn't a power of two; on such filesystems, certain IO
calls will fail due to alignment issues.  Fix that by providing rounding
helpers that work for all sizes.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>

diff --git a/ltp/fsstress.c b/ltp/fsstress.c
index e7cd0eae304d521af4cee5bf8e17497f5cdfd3c0..b4ddf5e2ef35eadf578d4e38649c4641da9fa7bf 100644 (file)
--- a/ltp/fsstress.c
+++ b/ltp/fsstress.c
@@ -2140,7 +2140,7 @@ do_aio_rw(int opno, long r, int flags)
                        " fallback to stat()\n",
                                procid, opno, f.path, st, errno);
                diob.d_mem = diob.d_miniosz = stb.st_blksize;
-               diob.d_maxiosz = INT_MAX & ~(diob.d_miniosz - 1);
+               diob.d_maxiosz = rounddown_64(INT_MAX, diob.d_miniosz);
        }
        dio_env = getenv("XFS_DIO_MIN");
        if (dio_env)
@@ -2608,7 +2608,7 @@ clonerange_f(
 
        /* Calculate offsets */
        len = (random() % FILELEN_MAX) + 1;
-       len &= ~(stat1.st_blksize - 1);
+       len = rounddown_64(len, stat1.st_blksize);
        if (len == 0)
                len = stat1.st_blksize;
        if (len > stat1.st_size)
@@ -2620,7 +2620,7 @@ clonerange_f(
        else
                off1 = (off64_t)(lr % MIN(stat1.st_size - len, MAXFSIZE));
        off1 %= maxfsize;
-       off1 &= ~(stat1.st_blksize - 1);
+       off1 = rounddown_64(off1, stat1.st_blksize);
 
        /*
         * If srcfile == destfile, randomly generate destination ranges
@@ -2631,7 +2631,7 @@ clonerange_f(
                lr = ((int64_t)random() << 32) + random();
                off2 = (off64_t)(lr % max_off2);
                off2 %= maxfsize;
-               off2 &= ~(stat2.st_blksize - 1);
+               off2 = rounddown_64(off2, stat2.st_blksize);
        } while (stat1.st_ino == stat2.st_ino && llabs(off2 - off1) < len);
 
        /* Clone data blocks */
@@ -2968,7 +2968,7 @@ deduperange_f(
 
        /* Never try to dedupe more than half of the src file. */
        len = (random() % FILELEN_MAX) + 1;
-       len &= ~(stat[0].st_blksize - 1);
+       len = rounddown_64(len, stat[0].st_blksize);
        if (len == 0)
                len = stat[0].st_blksize / 2;
        if (len > stat[0].st_size / 2)
@@ -2981,7 +2981,7 @@ deduperange_f(
        else
                off[0] = (off64_t)(lr % MIN(stat[0].st_size - len, MAXFSIZE));
        off[0] %= maxfsize;
-       off[0] &= ~(stat[0].st_blksize - 1);
+       off[0] = rounddown_64(off[0], stat[0].st_blksize);
 
        /*
         * If srcfile == destfile[i], randomly generate destination ranges
@@ -2997,7 +2997,7 @@ deduperange_f(
                        else
                                off[i] = (off64_t)(lr % MIN(stat[i].st_size - len, MAXFSIZE));
                        off[i] %= maxfsize;
-                       off[i] &= ~(stat[i].st_blksize - 1);
+                       off[i] = rounddown_64(off[i], stat[i].st_blksize);
                } while (stat[0].st_ino == stat[i].st_ino &&
                         llabs(off[i] - off[0]) < len &&
                         tries++ < 10);
@@ -3406,7 +3406,7 @@ dread_f(int opno, long r)
                        " fallback to stat()\n",
                                procid, opno, f.path, st, errno);
                diob.d_mem = diob.d_miniosz = stb.st_blksize;
-               diob.d_maxiosz = INT_MAX & ~(diob.d_miniosz - 1);
+               diob.d_maxiosz = rounddown_64(INT_MAX, diob.d_miniosz);
        }
 
        dio_env = getenv("XFS_DIO_MIN");
@@ -3483,7 +3483,7 @@ dwrite_f(int opno, long r)
                                " %s%s return %d, fallback to stat()\n",
                               procid, opno, f.path, st, errno);
                diob.d_mem = diob.d_miniosz = stb.st_blksize;
-               diob.d_maxiosz = INT_MAX & ~(diob.d_miniosz - 1);
+               diob.d_maxiosz = rounddown_64(INT_MAX, diob.d_miniosz);
        }
 
        dio_env = getenv("XFS_DIO_MIN");
@@ -3579,8 +3579,8 @@ do_fallocate(int opno, long r, int mode)
         */
        if ((mode & (FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_INSERT_RANGE)) &&
                (opno % 2)) {
-               off = ((off + stb.st_blksize - 1) & ~(stb.st_blksize - 1));
-               len = ((len + stb.st_blksize - 1) & ~(stb.st_blksize - 1));
+               off = roundup_64(off, stb.st_blksize);
+               len = roundup_64(len, stb.st_blksize);
        }
        mode |= FALLOC_FL_KEEP_SIZE & random();
        e = fallocate(fd, mode, (loff_t)off, (loff_t)len) < 0 ? errno : 0;
@@ -4186,7 +4186,7 @@ do_mmap(int opno, long r, int prot)
 
        lr = ((int64_t)random() << 32) + random();
        off = (off64_t)(lr % stb.st_size);
-       off &= (off64_t)(~(sysconf(_SC_PAGE_SIZE) - 1));
+       off = rounddown_64(off, sysconf(_SC_PAGE_SIZE));
        len = (size_t)(random() % MIN(stb.st_size - off, FILELEN_MAX)) + 1;
 
        flags = (random() % 2) ? MAP_SHARED : MAP_PRIVATE;

diff --git a/ltp/fsx.c b/ltp/fsx.c
index d526d294f7725d2d1a4fba0f18ffdd13805d53b0..12c2cc33bfe3414d33ebc6ada8fc204b73207109 100644 (file)
--- a/ltp/fsx.c
+++ b/ltp/fsx.c
@@ -203,7 +203,7 @@ static void *round_ptr_up(void *ptr, unsigned long align, unsigned long offset)
 {
        unsigned long ret = (unsigned long)ptr;
 
-       ret = ((ret + align - 1) & ~(align - 1));
+       ret = roundup_64(ret, align);
        ret += offset;
        return (void *)ret;
 }
@@ -1948,12 +1948,12 @@ static void generate_dest_range(bool bdy_align,
 
        TRIM_OFF_LEN(*src_offset, *size, file_size);
        if (bdy_align) {
-               *src_offset -= *src_offset % readbdy;
+               *src_offset = rounddown_64(*src_offset, readbdy);
                if (o_direct)
-                       *size -= *size % readbdy;
+                       *size = rounddown_64(*size, readbdy);
        } else {
-               *src_offset = *src_offset & ~(block_size - 1);
-               *size = *size & ~(block_size - 1);
+               *src_offset = rounddown_64(*src_offset, block_size);
+               *size = rounddown_64(*size, block_size);
        }
 
        do {
@@ -1964,9 +1964,9 @@ static void generate_dest_range(bool bdy_align,
                *dst_offset = random();
                TRIM_OFF(*dst_offset, max_range_end);
                if (bdy_align)
-                       *dst_offset -= *dst_offset % writebdy;
+                       *dst_offset = rounddown_64(*dst_offset, writebdy);
                else
-                       *dst_offset = *dst_offset & ~(block_size - 1);
+                       *dst_offset = rounddown_64(*dst_offset, block_size);
        } while (range_overlaps(*src_offset, *dst_offset, *size) ||
                 *dst_offset + *size > max_range_end);
 }
@@ -2156,8 +2156,8 @@ have_op:
                break;
        case OP_COLLAPSE_RANGE:
                TRIM_OFF_LEN(offset, size, file_size - 1);
-               offset = offset & ~(block_size - 1);
-               size = size & ~(block_size - 1);
+               offset = rounddown_64(offset, block_size);
+               size = rounddown_64(size, block_size);
                if (size == 0) {
                        log4(OP_COLLAPSE_RANGE, offset, size, FL_SKIPPED);
                        goto out;
@@ -2167,8 +2167,8 @@ have_op:
        case OP_INSERT_RANGE:
                TRIM_OFF(offset, file_size);
                TRIM_LEN(file_size, size, maxfilelen);
-               offset = offset & ~(block_size - 1);
-               size = size & ~(block_size - 1);
+               offset = rounddown_64(offset, block_size);
+               size = rounddown_64(size, block_size);
                if (size == 0) {
                        log4(OP_INSERT_RANGE, offset, size, FL_SKIPPED);
                        goto out;

diff --git a/src/global.h b/src/global.h
index e5e46234347024dc9f766908dfe3c29e24de4803..b44070993c0f45fa65c20944160ce5ffdcea3e45 100644 (file)
--- a/src/global.h
+++ b/src/global.h
@@ -171,4 +171,17 @@
 #include <sys/mman.h>
 #endif
 
+static inline unsigned long long
+rounddown_64(unsigned long long x, unsigned int y)
+{
+       x /= y;
+       return x * y;
+}
+
+static inline unsigned long long
+roundup_64(unsigned long long x, unsigned int y)
+{
+       return rounddown_64(x + y - 1, y);
+}
+
 #endif /* GLOBAL_H */