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Message-Id: <200710071920.l97JKJX5018871@agora.fsl.cs.sunysb.edu> Date: Sun, 7 Oct 2007 15:20:19 -0400 From: Erez Zadok <ezk@...sunysb.edu> To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org Cc: "Ryan Finnie" <ryan@...nie.org>, Colin Watson <cjwatson@...ntu.com> Subject: msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland According to vfs.txt, ->writepage() may return AOP_WRITEPAGE_ACTIVATE back to the VFS/VM. Indeed some filesystems such as tmpfs can return AOP_WRITEPAGE_ACTIVATE; and stackable file systems (e.g., Unionfs) also return AOP_WRITEPAGE_ACTIVATE if the lower f/s returned it. Anyway, some Ubuntu users of Unionfs reported that msync(2) sometimes returns AOP_WRITEPAGE_ACTIVATE (decimal 524288) back to userland. Therefore, some user programs fail, esp. if they're written such as this: err = msync(...); if (err != 0) // fail They temporarily fixed the specific program in question (apt-get) to check if (err < 0) // fail Is this a bug indeed, or are user programs supposed to handle AOP_WRITEPAGE_ACTIVATE (I hope not the latter). If it's a kernel bug, what should the kernel return: a zero, or an -errno (and which one)? Thanks, Erez. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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