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copy: shortcut reflink_range() to reflink() in some cases

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This commit is contained in:
Lennart Poettering 2023-04-28 15:16:00 +02:00
parent 427ad121c2
commit 535358ad2e
1 changed files with 6 additions and 0 deletions
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6
src/shared/copy.c
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@ -1631,6 +1631,12 @@ int reflink_range(int infd, uint64_t in_offset, int outfd, uint64_t out_offset,
assert(infd >= 0);
assert(outfd >= 0);
/* Inside the kernel, FICLONE is identical to FICLONERANGE with offsets and size set to zero, let's
* simplify things and use the simple ioctl in that case. Also, do the same if the size is
* UINT64_MAX, which is how we usually encode "everything". */
if (in_offset == 0 && out_offset == 0 && IN_SET(sz, 0, UINT64_MAX))
return reflink(infd, outfd);
r = fd_verify_regular(outfd);
if (r < 0)
return r;