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Index: sys/kern/vfs_vnops.c
===================================================================
--- sys/kern/vfs_vnops.c
+++ sys/kern/vfs_vnops.c
@@ -3263,13 +3263,13 @@
len = savlen = rounddown(len - rem, blksize) + rem;
}
- if (blksize <= 1)
+ if (blksize <= 512)
blksize = MAX(invp->v_mount->mnt_stat.f_iosize,
outvp->v_mount->mnt_stat.f_iosize);
if (blksize < 4096)
blksize = 4096;
- else if (blksize > 1024 * 1024)
- blksize = 1024 * 1024;
+ else if (blksize > maxphys)
+ blksize = maxphys;
dat = malloc(blksize, M_TEMP, M_WAITOK);
/*
@@ -3378,7 +3378,7 @@
}
xfer = blksize;
- if (cantseek) {
+ if (__predict_false(cantseek)) {
/*
* Set first xfer to end at a block boundary, so that
* holes are more likely detected in the loop below via

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