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Differential D26570 Diff 77618 sys/kern/vfs_vnops.c.sav3

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sys/kern/vfs_vnops.c.sav3

Show First 20 Lines • Show All 3,003 Lines • ▼ Show 20 Linesvn_generic_copy_file_range(struct vnode *invp, off_t *inoffp,
struct vattr va; struct vattr va;
struct mount *mp; struct mount *mp;
struct uio io; struct uio io;
off_t startoff, endoff, xfer, xfer2; off_t startoff, endoff, xfer, xfer2;
u_long blksize; u_long blksize;
int error; int error;
bool cantseek, readzeros, eof, lastblock; bool cantseek, readzeros, eof, lastblock;
ssize_t aresid; ssize_t aresid;
size_t copylen, len, savlen; size_t copylen, len, rem, savlen;
char *dat; char *dat;
long holein, holeout; long holein, holeout;
uint64_t curtime, stoptime; uint64_t curtime, stoptime;
struct timespec tm; struct timespec tm;
nanouptime(&tm); nanouptime(&tm);
stoptime = tm.tv_sec + 1; stoptime = tm.tv_sec + 1;
stoptime = stoptime * 1000000 + tm.tv_nsec / 1000; stoptime = stoptime * 1000000 + tm.tv_nsec / 1000;
▲ Show 20 Lines • Show All 57 Lines • ▼ Show 20 Lines#endif
/* /*
* Set the blksize to the larger of the hole sizes for invp and outvp. * Set the blksize to the larger of the hole sizes for invp and outvp.
* If hole sizes aren't available, set the blksize to the larger * If hole sizes aren't available, set the blksize to the larger
* f_iosize of invp and outvp. * f_iosize of invp and outvp.
* This code expects the hole sizes and f_iosizes to be powers of 2. * This code expects the hole sizes and f_iosizes to be powers of 2.
* This value is clipped at 4Kbytes and 1Mbyte. * This value is clipped at 4Kbytes and 1Mbyte.
*/ */
blksize = MAX(holein, holeout); blksize = MAX(holein, holeout);
if (blksize == 0)
/* Clip len to end at an exact multiple of hole size. */
if (blksize > 1) {
asomersUnsubmitted
Done
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/* Clip len to end at an exact multiple of hole size. */
- if (blksize > 0) {
+ if (blksize > 1) {
rem = *inoffp % blksize;

According to pathconf(2), _PC_MIN_HOLE_SIZE has a special meaning for 1. So that's probably a common value. You can optimize this block by changing the test to if (blksize > 1)

asomers: According to pathconf(2), `_PC_MIN_HOLE_SIZE` has a special meaning for 1. So that's probably…
rem = *inoffp % blksize;
asomersUnsubmitted
Done
Inline Actions

This expression is also defined as rounddown(len, blksize).

asomers: This expression is also defined as `rounddown(len, blksize)`.
if (rem > 0)
rem = blksize - rem;
if (len - rem > blksize)
len = savlen = rounddown(len - rem, blksize) + rem;
}
if (blksize <= 1)
blksize = MAX(invp->v_mount->mnt_stat.f_iosize, blksize = MAX(invp->v_mount->mnt_stat.f_iosize,
outvp->v_mount->mnt_stat.f_iosize); outvp->v_mount->mnt_stat.f_iosize);
if (blksize < 4096) if (blksize < 4096)
blksize = 4096; blksize = 4096;
else if (blksize > 1024 * 1024) else if (blksize > 1024 * 1024)
blksize = 1024 * 1024; blksize = 1024 * 1024;
dat = malloc(blksize, M_TEMP, M_WAITOK); dat = malloc(blksize, M_TEMP, M_WAITOK);
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