mirror of https://gitee.com/openkylin/linux.git
Changes since last update:
- Cap the maximum length of a deduplication request at MAX_RW_COUNT/2 to avoid kernel livelock due to excessively large IO requests. -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEUzaAxoMeQq6m2jMV+H93GTRKtOsFAlrp5f0ACgkQ+H93GTRK tOuflQ//VOKn73zjiwhYPcN4a45/O4sWVxGdAS59+W3usFYG5S6u/OC9XNmaGP2V XVmf5VhfYT6MsYq562JVMuXo9GiqU2cMbvFuHQHibdlk+hHVPeIQI5ipBn7K7OMj cgvlE3UWKm407QamC9mM62HyeDb9fyXJnDN+nXi6LruPg6ClJQHt1AQLxlDRu6Bm ioIpyBJKWbCGbXEGiGIUu5Jv8ohKyZ0lUnxJTRqYrKvqEQ/pDpkMI6POwC0TuHVr Kd9z2KCKH7RQmtC1zSFzaXn7N5jb2C1Z70i50F7eeC8MLZJbsXxK3pJlugsOYU4D NCgELpqoYV5R08B+Z4yp2Wj91PWBDuY6cTigArLjqvRN1IX2Q+g8uOQhKi1q0c4x x+18y+cAPsNgpzu92SFUzJHGLJg5kHxN2wcqt2rIsTdJQt3Z3mIW/sCW/+69v4nu arHRMhfa6whcFm30phGyw3juYOsxwypasCGWoDR4A5x8Jy0hrsGhVN1SW6Iw1v7W AGYNH1BIb+2qjQ6To6YgRvwvhbT8EpvxwBi3c0wgmOuI3/oOdiJBS4A7tGXo4fHQ 9CK6gucf9VCX3Nij+juHBXwIeBJ6m6yWX4zD1R5zhA5Z8RIZRMe16aFoOfmHyrAg SnwYrOBZFD1k3I5fwcWovxxY9V0CxiZOGg217YkSZP5N7+PamZc= =l9pt -----END PGP SIGNATURE----- Merge tag 'xfs-4.17-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux Pull xfs fixes from Darrick Wong: "I've got one more bug fix for xfs for 4.17-rc4, which caps the amount of data we try to handle in one dedupe request so that userspace can't livelock the kernel. This series has been run through a full xfstests run during the week and through a quick xfstests run against this morning's master, with no ajor failures reported. Summary: - Cap the maximum length of a deduplication request at MAX_RW_COUNT/2 to avoid kernel livelock due to excessively large IO requests" * tag 'xfs-4.17-fixes-2' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: xfs: cap the length of deduplication requests
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commit
2e171ffcdf
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@ -880,8 +880,18 @@ xfs_file_dedupe_range(
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struct file *dst_file,
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u64 dst_loff)
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{
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struct inode *srci = file_inode(src_file);
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u64 max_dedupe;
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int error;
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/*
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* Since we have to read all these pages in to compare them, cut
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* it off at MAX_RW_COUNT/2 rounded down to the nearest block.
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* That means we won't do more than MAX_RW_COUNT IO per request.
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*/
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max_dedupe = (MAX_RW_COUNT >> 1) & ~(i_blocksize(srci) - 1);
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if (len > max_dedupe)
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len = max_dedupe;
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error = xfs_reflink_remap_range(src_file, loff, dst_file, dst_loff,
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len, true);
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if (error)
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