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284ae18c1d
Filesystem operations generally operate within a subvolume: at the start of every btree transaction we'll be looking up (and locking) the subvolume to get the current snapshot ID, which we then use for our other btree lookups in BTREE_ITER_FILTER_SNAPSHOTS mode. But inodes don't record what subvolume they're in - they can't, because if they did we'd have to update every single inode within a subvolume when taking a snapshot in order to keep that field up to date. So it needs to be tracked in memory, based on how we got to that inode. Hence this patch adds a subvolume field to ei_inode_info, and switches to iget5() so we can index by it in the inode hash table. Signed-off-by: Kent Overstreet <kent.overstreet@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.