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author | OpenShift Merge Robot <openshift-merge-robot@users.noreply.github.com> | 2022-02-17 11:24:37 -0500 |
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committer | GitHub <noreply@github.com> | 2022-02-17 11:24:37 -0500 |
commit | a09e94f9ca0a5f8511b5b1e04dc8b6ef2255b061 (patch) | |
tree | 5d0eae54d0bcde19e18c48e31d05f8cccc45dd36 /vendor/github.com/moby | |
parent | 71474f64b9c0275c65bc04385b486101cff40786 (diff) | |
parent | 38811823c1c60653893b751f06648e99328b1d1d (diff) | |
download | podman-a09e94f9ca0a5f8511b5b1e04dc8b6ef2255b061.tar.gz podman-a09e94f9ca0a5f8511b5b1e04dc8b6ef2255b061.tar.bz2 podman-a09e94f9ca0a5f8511b5b1e04dc8b6ef2255b061.zip |
Merge pull request #13263 from giuseppe/update-c-storage
vendor: update c/storage to 26c561f9
Diffstat (limited to 'vendor/github.com/moby')
-rw-r--r-- | vendor/github.com/moby/sys/mountinfo/mounted_linux.go | 58 | ||||
-rw-r--r-- | vendor/github.com/moby/sys/mountinfo/mountinfo.go | 6 |
2 files changed, 54 insertions, 10 deletions
diff --git a/vendor/github.com/moby/sys/mountinfo/mounted_linux.go b/vendor/github.com/moby/sys/mountinfo/mounted_linux.go index 5c9e3e30e..bf221e687 100644 --- a/vendor/github.com/moby/sys/mountinfo/mounted_linux.go +++ b/vendor/github.com/moby/sys/mountinfo/mounted_linux.go @@ -7,6 +7,34 @@ import ( "golang.org/x/sys/unix" ) +// MountedFast is a method of detecting a mount point without reading +// mountinfo from procfs. A caller can only trust the result if no error +// and sure == true are returned. Otherwise, other methods (e.g. parsing +// /proc/mounts) have to be used. If unsure, use Mounted instead (which +// uses MountedFast, but falls back to parsing mountinfo if needed). +// +// If a non-existent path is specified, an appropriate error is returned. +// In case the caller is not interested in this particular error, it should +// be handled separately using e.g. errors.Is(err, os.ErrNotExist). +// +// This function is only available on Linux. When available (since kernel +// v5.6), openat2(2) syscall is used to reliably detect all mounts. Otherwise, +// the implementation falls back to using stat(2), which can reliably detect +// normal (but not bind) mounts. +func MountedFast(path string) (mounted, sure bool, err error) { + // Root is always mounted. + if path == string(os.PathSeparator) { + return true, true, nil + } + + path, err = normalizePath(path) + if err != nil { + return false, false, err + } + mounted, sure, err = mountedFast(path) + return +} + // mountedByOpenat2 is a method of detecting a mount that works for all kinds // of mounts (incl. bind mounts), but requires a recent (v5.6+) linux kernel. func mountedByOpenat2(path string) (bool, error) { @@ -34,24 +62,40 @@ func mountedByOpenat2(path string) (bool, error) { return false, &os.PathError{Op: "openat2", Path: path, Err: err} } -func mounted(path string) (bool, error) { - path, err := normalizePath(path) - if err != nil { - return false, err +// mountedFast is similar to MountedFast, except it expects a normalized path. +func mountedFast(path string) (mounted, sure bool, err error) { + // Root is always mounted. + if path == string(os.PathSeparator) { + return true, true, nil } + // Try a fast path, using openat2() with RESOLVE_NO_XDEV. - mounted, err := mountedByOpenat2(path) + mounted, err = mountedByOpenat2(path) if err == nil { - return mounted, nil + return mounted, true, nil } + // Another fast path: compare st.st_dev fields. mounted, err = mountedByStat(path) // This does not work for bind mounts, so false negative // is possible, therefore only trust if return is true. if mounted && err == nil { + return true, true, nil + } + + return +} + +func mounted(path string) (bool, error) { + path, err := normalizePath(path) + if err != nil { + return false, err + } + mounted, sure, err := mountedFast(path) + if sure && err == nil { return mounted, nil } - // Fallback to parsing mountinfo + // Fallback to parsing mountinfo. return mountedByMountinfo(path) } diff --git a/vendor/github.com/moby/sys/mountinfo/mountinfo.go b/vendor/github.com/moby/sys/mountinfo/mountinfo.go index 9867a66dd..c7e5cb42a 100644 --- a/vendor/github.com/moby/sys/mountinfo/mountinfo.go +++ b/vendor/github.com/moby/sys/mountinfo/mountinfo.go @@ -13,9 +13,9 @@ func GetMounts(f FilterFunc) ([]*Info, error) { // Mounted determines if a specified path is a mount point. In case of any // error, false (and an error) is returned. // -// The non-existent path returns an error. If a caller is not interested -// in this particular error, it should handle it separately using e.g. -// errors.Is(err, os.ErrNotExist). +// If a non-existent path is specified, an appropriate error is returned. +// In case the caller is not interested in this particular error, it should +// be handled separately using e.g. errors.Is(err, os.ErrNotExist). func Mounted(path string) (bool, error) { // root is always mounted if path == string(os.PathSeparator) { |