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31799cc4a7
commit 49d31c2f389acfe83417083e1208422b4091cd9e upstream. take_dentry_name_snapshot() takes a safe snapshot of dentry name; if the name is a short one, it gets copied into caller-supplied structure, otherwise an extra reference to external name is grabbed (those are never modified). In either case the pointer to stable string is stored into the same structure. dentry must be held by the caller of take_dentry_name_snapshot(), but may be freely dropped afterwards - the snapshot will stay until destroyed by release_dentry_name_snapshot(). Intended use: struct name_snapshot s; take_dentry_name_snapshot(&s, dentry); ... access s.name ... release_dentry_name_snapshot(&s); Replaces fsnotify_oldname_...(), gets used in fsnotify to obtain the name to pass down with event. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> [carnil: backport 4.9: adjust context] [bwh: Backported to 3.16: - External names are not ref-counted, so copy them - Adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> [ghackmann@google.com: backported to 3.10: adjust context] Signed-off-by: Greg Hackmann <ghackmann@google.com> Change-Id: I612e687cbffa1a03107331a6b3f00911ffbebd8e Bug: 63689921 |
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