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overlayfs file open (ovl_maybe_lookup_lowerdata) and overlay file llseek take the ovl_inode_lock, without holding upper sb_writers. In case of nested lower overlay that uses same upper fs as this overlay, lockdep will warn about (possibly false positive) circular lock dependency when doing open/llseek of lower ovl file during copy up with our upper sb_writers held, because the locking ordering seems reverse to the locking order in ovl_copy_up_start(): - lower ovl_inode_lock - upper sb_writers Let the copy up "transaction" keeps an elevated mnt write count on upper mnt, but leaves taking upper sb_writers to lower level helpers only when they actually need it. This allows to avoid holding upper sb_writers during lower file open/llseek and prevents the lockdep warning. Minimizing the scope of upper sb_writers during copy up is also needed for fixing another possible deadlocks by a following patch. Signed-off-by: Amir Goldstein <amir73il@gmail.com> |
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| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.