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Brian Behlendorf de198f2d95
Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency
When using lseek(2) to report data/holes memory mapped regions of
the file were ignored.  This could result in incorrect results.
To handle this zfs_holey_common() was updated to asynchronously
writeback any dirty mmap(2) regions prior to reporting holes.

Additionally, while not strictly required, the dn_struct_rwlock is
now held over the dirty check to prevent the dnode structure from
changing.  This ensures that a clean dnode can't be dirtied before
the data/hole is located.  The range lock is now also taken to
ensure the call cannot race with zfs_write().

Furthermore, the code was refactored to provide a dnode_is_dirty()
helper function which checks the dnode for any dirty records to
determine its dirtiness.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Rich Ercolani <rincebrain@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #11900
Closes #12724
2021-11-07 14:27:44 -07:00
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contrib Update contrib/initramfs/README.initramfs.markdown 2021-11-04 09:23:50 -06:00
etc systemd: import: expand $ZPOOL_IMPORT_OPTS correctly 2021-06-14 09:48:53 -06:00
include Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-07 14:27:44 -07:00
lib Add more explicit warning about dedup being dropped 2021-11-02 15:45:20 -06:00
man Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-07 14:27:44 -07:00
module Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-07 14:27:44 -07:00
rpm Added uncompress requirement 2021-06-11 09:38:23 -06:00
scripts Update checkstyle workflow env to ubuntu-20.04 2021-11-02 14:02:57 -06:00
tests Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-07 14:27:44 -07:00
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CODE_OF_CONDUCT.md Replace ZFS on Linux references with OpenZFS 2020-10-08 20:10:13 -07:00
configure.ac Fix lseek(SEEK_DATA/SEEK_HOLE) mmap consistency 2021-11-07 14:27:44 -07:00
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 12.2-RELEASE.