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f267719c38
journald calls fd_get_path() a lot (it probably shouldn't, there's some room for improvement there, but I'll leave that for another time), hence it's worth optimizing the call a bit, in particular as it's easy. Previously we'd open the dir /proc/self/fd/ first, before reading the symlink inside it. This means the whole function requires three system calls: open(), readlinkat(), close(). The reason for doing it this way is to distinguish the case when we see ENOENT because /proc is not mounted and the case when the fd doesn't exist. With this change we'll directly go for the readlink(), and only if that fails do an access() to see if /proc is mounted at all. This optimizes the common case (where the fd is valid and /proc mounted), in favour of the uncommon case (where the fd doesn#t exist or /proc is not mounted).
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