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On Thu, Dec 27, 2018 at 06:18:19PM +0100, Florian Weimer wrote: > We have a bit of an interesting problem with respect to the d_off > field in struct dirent. > > When running a 64-bit kernel on certain file systems, notably ext4, > this field uses the full 63 bits even for small directories (strace -v > output, wrapped here for readability): > > getdents(3, [ > {d_ino=1494304, d_off=3901177228673045825, d_reclen=40, d_name="authorized_keys", d_type=DT_REG}, > {d_ino=1494277, d_off=7491915799041650922, d_reclen=24, d_name=".", d_type=DT_DIR}, > {d_ino=1314655, d_off=9223372036854775807, d_reclen=24, d_name="..", d_type=DT_DIR} > ], 32768) = 88 > > When running in 32-bit compat mode, this value is somehow truncated to > 31 bits, for both the getdents and the getdents64 (!) system call (at > least on i386). Why getdents64 system call is affected by this truncation, isn't it a kernel bug that has to be fixed in the kernel instead? -- ldv
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