diff options
Diffstat (limited to 'pkg/sentry/vfs/dentry.go')
| -rw-r--r-- | pkg/sentry/vfs/dentry.go | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/pkg/sentry/vfs/dentry.go b/pkg/sentry/vfs/dentry.go index e7ca24d96..cb92b6eee 100644 --- a/pkg/sentry/vfs/dentry.go +++ b/pkg/sentry/vfs/dentry.go @@ -18,8 +18,8 @@ import ( "sync/atomic" "gvisor.dev/gvisor/pkg/context" + "gvisor.dev/gvisor/pkg/errors/linuxerr" "gvisor.dev/gvisor/pkg/sync" - "gvisor.dev/gvisor/pkg/syserror" ) // Dentry represents a node in a Filesystem tree at which a file exists. @@ -196,11 +196,12 @@ func (d *Dentry) OnZeroWatches(ctx context.Context) { // PrepareDeleteDentry must be called before attempting to delete the file // represented by d. If PrepareDeleteDentry succeeds, the caller must call // AbortDeleteDentry or CommitDeleteDentry depending on the deletion's outcome. +// +checklocksacquire:d.mu func (vfs *VirtualFilesystem) PrepareDeleteDentry(mntns *MountNamespace, d *Dentry) error { vfs.mountMu.Lock() if mntns.mountpoints[d] != 0 { vfs.mountMu.Unlock() - return syserror.EBUSY + return linuxerr.EBUSY // +checklocksforce: inconsistent return. } d.mu.Lock() vfs.mountMu.Unlock() @@ -211,14 +212,14 @@ func (vfs *VirtualFilesystem) PrepareDeleteDentry(mntns *MountNamespace, d *Dent // AbortDeleteDentry must be called after PrepareDeleteDentry if the deletion // fails. -// +checklocks:d.mu +// +checklocksrelease:d.mu func (vfs *VirtualFilesystem) AbortDeleteDentry(d *Dentry) { d.mu.Unlock() } // CommitDeleteDentry must be called after PrepareDeleteDentry if the deletion // succeeds. -// +checklocks:d.mu +// +checklocksrelease:d.mu func (vfs *VirtualFilesystem) CommitDeleteDentry(ctx context.Context, d *Dentry) { d.dead = true d.mu.Unlock() @@ -249,16 +250,18 @@ func (vfs *VirtualFilesystem) InvalidateDentry(ctx context.Context, d *Dentry) { // Preconditions: // * If to is not nil, it must be a child Dentry from the same Filesystem. // * from != to. +// +checklocksacquire:from.mu +// +checklocksacquire:to.mu func (vfs *VirtualFilesystem) PrepareRenameDentry(mntns *MountNamespace, from, to *Dentry) error { vfs.mountMu.Lock() if mntns.mountpoints[from] != 0 { vfs.mountMu.Unlock() - return syserror.EBUSY + return linuxerr.EBUSY // +checklocksforce: no locks acquired. } if to != nil { if mntns.mountpoints[to] != 0 { vfs.mountMu.Unlock() - return syserror.EBUSY + return linuxerr.EBUSY // +checklocksforce: no locks acquired. } to.mu.Lock() } @@ -267,13 +270,13 @@ func (vfs *VirtualFilesystem) PrepareRenameDentry(mntns *MountNamespace, from, t // Return with from.mu and to.mu locked, which will be unlocked by // AbortRenameDentry, CommitRenameReplaceDentry, or // CommitRenameExchangeDentry. - return nil + return nil // +checklocksforce: to may not be acquired. } // AbortRenameDentry must be called after PrepareRenameDentry if the rename // fails. -// +checklocks:from.mu -// +checklocks:to.mu +// +checklocksrelease:from.mu +// +checklocksrelease:to.mu func (vfs *VirtualFilesystem) AbortRenameDentry(from, to *Dentry) { from.mu.Unlock() if to != nil { @@ -286,8 +289,8 @@ func (vfs *VirtualFilesystem) AbortRenameDentry(from, to *Dentry) { // that was replaced by from. // // Preconditions: PrepareRenameDentry was previously called on from and to. -// +checklocks:from.mu -// +checklocks:to.mu +// +checklocksrelease:from.mu +// +checklocksrelease:to.mu func (vfs *VirtualFilesystem) CommitRenameReplaceDentry(ctx context.Context, from, to *Dentry) { from.mu.Unlock() if to != nil { @@ -303,8 +306,8 @@ func (vfs *VirtualFilesystem) CommitRenameReplaceDentry(ctx context.Context, fro // from and to are exchanged by rename(RENAME_EXCHANGE). // // Preconditions: PrepareRenameDentry was previously called on from and to. -// +checklocks:from.mu -// +checklocks:to.mu +// +checklocksrelease:from.mu +// +checklocksrelease:to.mu func (vfs *VirtualFilesystem) CommitRenameExchangeDentry(from, to *Dentry) { from.mu.Unlock() to.mu.Unlock() |