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diff --git a/sys/kern/vfs_vnops.c.sparse b/sys/kern/vfs_vnops.c
--- a/sys/kern/vfs_vnops.c.sparse
+++ b/sys/kern/vfs_vnops.c
@@ -3273,14 +3273,15 @@
struct vnode *outvp, off_t *outoffp, size_t *lenp, unsigned int flags,
struct ucred *incred, struct ucred *outcred, struct thread *fsize_td)
{
+ struct vattr inva;
struct mount *mp;
off_t startoff, endoff, xfer, xfer2;
u_long blksize;
int error, interrupted;
- bool cantseek, readzeros, eof, lastblock, holetoeof;
+ bool cantseek, readzeros, eof, lastblock, holetoeof, sparse;
ssize_t aresid, r = 0;
size_t copylen, len, savlen;
- off_t insize, outsize;
+ off_t outsize;
char *dat;
long holein, holeout;
struct timespec curts, endts;
@@ -3296,11 +3297,26 @@
goto out;
if (VOP_PATHCONF(invp, _PC_MIN_HOLE_SIZE, &holein) != 0)
holein = 0;
- error = vn_getsize_locked(invp, &insize, incred);
+ error = VOP_GETATTR(invp, &inva, incred);
+ if (error == 0 && inva.va_size > OFF_MAX)
+ error = EFBIG;
VOP_UNLOCK(invp);
if (error != 0)
goto out;
+ /*
+ * Use va_bytes >= va_size as a hint that the file does not have
+ * sufficient holes to justify the overhead of doing FIOSEEKHOLE.
+ * This hint does not work well for file systems doing compression
+ * and may fail when allocations for extended attributes increases
+ * the value of va_bytes to >= va_size.
+ */
+ sparse = true;
+ if (holein != 0 && inva.va_bytes >= inva.va_size) {
+ holein = 0;
+ sparse = false;
+ }
+
mp = NULL;
error = vn_start_write(outvp, &mp, V_WAIT);
if (error == 0)
@@ -3334,9 +3350,9 @@
error = vn_getsize_locked(outvp, &outsize, outcred);
if (error == 0 && outsize > *outoffp &&
*outoffp <= OFF_MAX - len && outsize <= *outoffp + len &&
- *inoffp < insize &&
- *outoffp <= OFF_MAX - (insize - *inoffp) &&
- outsize <= *outoffp + (insize - *inoffp)) {
+ *inoffp < inva.va_size &&
+ *outoffp <= OFF_MAX - (inva.va_size - *inoffp) &&
+ outsize <= *outoffp + (inva.va_size - *inoffp)) {
#ifdef MAC
error = mac_vnode_check_write(curthread->td_ucred,
outcred, outvp);
@@ -3354,7 +3370,7 @@
if (error != 0)
goto out;
- if (holein == 0 && holeout > 0) {
+ if (sparse && holein == 0 && holeout > 0) {
/*
* For this special case, the input data will be scanned
* for blocks of all 0 bytes. For these blocks, the
@@ -3425,7 +3441,7 @@
error = VOP_IOCTL(invp, FIOSEEKDATA, &startoff, 0,
incred, curthread);
if (error == ENXIO) {
- startoff = endoff = insize;
+ startoff = endoff = inva.va_size;
eof = holetoeof = true;
error = 0;
}
@@ -3488,6 +3504,8 @@
cantseek = false;
} else {
cantseek = true;
+ if (!sparse)
+ cantseek = false;
startoff = *inoffp;
copylen = len;
error = 0;

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