Robinhood Sync Acceleration for PanFS #108
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Change-Id: I88c3deb32f977452cbcdb9b0cc3521f1cbc58eaa
Panasas pan_snap_delta update functionality 6 See merge request panasas/robinhood!1
tl-cea
reviewed
Aug 30, 2024
| return rc; | ||
| } | ||
| #ifdef _PANFS | ||
| st = &stn; |
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I'd prefer you include this large piece of code in a subfonction.
tl-cea
reviewed
Aug 30, 2024
| } | ||
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| #ifdef _PANFS | ||
| signal_scan_finished(); |
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I don't understand why a scan with PanFS would require a different behavior here.
tl-cea
reviewed
Aug 30, 2024
| if (fstatat(parentfd, name, inode, AT_SYMLINK_NOFOLLOW) == -1) | ||
| return -errno; | ||
| #ifdef _PANFS | ||
| ssize_t vallentmp; |
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I'd prefer this code is included to a subfunction here, to avoid overloading the code.
tl-cea
reviewed
Aug 30, 2024
| return -errno; | ||
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| #ifdef _PANFS | ||
| else{ |
tl-cea
reviewed
Aug 30, 2024
| } | ||
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| #ifdef _PANFS | ||
| size_t vallentmp; |
tl-cea
reviewed
Aug 30, 2024
| Exit(1); | ||
| } | ||
| #ifdef _PANFS | ||
| ssize_t vallentmp; |
tl-cea
reviewed
Aug 30, 2024
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This pull request contains changes made this summer by employees at Panasas to provide support akin to what already exists for Lustre to accelerate updates to the Robinhood DB for the Panasas filesystem. Unlike in Lustre, which leverages it's changelog to keep the Robinhood DB up-to-date, in this change we use the PanFS snapshot delta utility to compute differences between successive snapshots, track which was the last snapshot we successfully updated from, and update when a newer snapshot is available using just the computed differences.
In the interest of de-risking existing users of Lustre or just the POSIX version of Robinhood that does a full tree walk, we compile out almost all of our code unless --enable-panfs is passed to configure.
Detailed changes include the following:
Please let me know if there are any issues with the code in this request and I'll be glad to make modifications to alleviate such concerns. Thanks!