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70d41c9e27
We've been using __GFP_NOFAIL for allocating struct bch_folio, our private per-folio state. However, that struct is variable size - it holds state for each sector in the folio, and folios can be quite large now, which means it's possible for bch_folio to be larger than PAGE_SIZE now. __GFP_NOFAIL allocations are undesirable in normal circumstances, but particularly so at >= PAGE_SIZE, and warnings are emitted for that. So, this patch adds proper error paths and eliminates most uses of __GFP_NOFAIL. Also, do some more cleanup of gfp flags w.r.t. btree node locks: we can use GFP_KERNEL, but only if we're not holding btree locks, and if we are holding btree locks we should be using GFP_NOWAIT. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
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.