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Merge pull request moby#27520 from dmcgowan/fix-27384
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Add limit to page size used by overlay2 driver
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thaJeztah authored Oct 19, 2016
2 parents 194f04b + 520034e commit 74f486c
Showing 1 changed file with 9 additions and 0 deletions.
9 changes: 9 additions & 0 deletions daemon/graphdriver/overlay2/overlay.go
Original file line number Diff line number Diff line change
Expand Up @@ -473,6 +473,15 @@ func (d *Driver) Get(id string, mountLabel string) (s string, err error) {

pageSize := syscall.Getpagesize()

// Go can return a larger page size than supported by the system
// as of go 1.7. This will be fixed in 1.8 and this block can be
// removed when building with 1.8.
// See https://github.com/golang/go/commit/1b9499b06989d2831e5b156161d6c07642926ee1
// See https://github.com/docker/docker/issues/27384
if pageSize > 4096 {
pageSize = 4096
}

// Use relative paths and mountFrom when the mount data has exceeded
// the page size. The mount syscall fails if the mount data cannot
// fit within a page and relative links make the mount data much
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