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So far, fanotify returns -ENODEV or -EXDEV when trying to set a mark on a filesystem with a "weak" fsid, namely, zero fsid (e.g. fuse), or non-uniform fsid (e.g. btrfs non-root subvol). When group is watching inodes all from the same filesystem (or subvol), allow adding inode marks with "weak" fsid, because there is no ambiguity regarding which filesystem reports the event. The first mark added to a group determines if this group is single or multi filesystem, depending on the fsid at the path of the added mark. If the first mark added has a "strong" fsid, marks with "weak" fsid cannot be added and vice versa. If the first mark added has a "weak" fsid, following marks must have the same "weak" fsid and the same sb as the first mark. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz> Message-Id: <20231130165619.3386452-3-amir73il@gmail.com>
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.