[Linux-kernel-mentees] [PATCH 1/5] Documentation: nfs: convert pnfs.txt to ReST

Daniel W. S. Almeida dwlsalmeida at gmail.com
Mon Dec 30 05:04:43 UTC 2019

From: "Daniel W. S. Almeida" <dwlsalmeida at gmail.com>

Convert pnfs.txt to ReST. Content remains mostly unchanged.

Signed-off-by: Daniel W. S. Almeida <dwlsalmeida at gmail.com>
 Documentation/filesystems/index.rst           |  1 +
 Documentation/filesystems/nfs/index.rst       |  9 +++++++
 .../filesystems/nfs/{pnfs.txt => pnfs.rst}    | 25 +++++++++++--------
 3 files changed, 25 insertions(+), 10 deletions(-)
 create mode 100644 Documentation/filesystems/nfs/index.rst
 rename Documentation/filesystems/nfs/{pnfs.txt => pnfs.rst} (87%)

diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst
index ad6315a48d14..801d773a44b9 100644
--- a/Documentation/filesystems/index.rst
+++ b/Documentation/filesystems/index.rst
@@ -48,3 +48,4 @@ Documentation for filesystem implementations.
+   nfs/index
diff --git a/Documentation/filesystems/nfs/index.rst b/Documentation/filesystems/nfs/index.rst
new file mode 100644
index 000000000000..d19ba592779a
--- /dev/null
+++ b/Documentation/filesystems/nfs/index.rst
@@ -0,0 +1,9 @@
+.. toctree::
+   :maxdepth: 1
+   pnfs
diff --git a/Documentation/filesystems/nfs/pnfs.txt b/Documentation/filesystems/nfs/pnfs.rst
similarity index 87%
rename from Documentation/filesystems/nfs/pnfs.txt
rename to Documentation/filesystems/nfs/pnfs.rst
index 80dc0bdc302a..7c470ecdc3a9 100644
--- a/Documentation/filesystems/nfs/pnfs.txt
+++ b/Documentation/filesystems/nfs/pnfs.rst
@@ -1,15 +1,17 @@
-Reference counting in pnfs:
+Reference counting in pnfs
 The are several inter-related caches.  We have layouts which can
 reference multiple devices, each of which can reference multiple data servers.
 Each data server can be referenced by multiple devices.  Each device
-can be referenced by multiple layouts.  To keep all of this straight,
+can be referenced by multiple layouts. To keep all of this straight,
 we need to reference count.
 struct pnfs_layout_hdr
 The on-the-wire command LAYOUTGET corresponds to struct
 pnfs_layout_segment, usually referred to by the variable name lseg.
 Each nfs_inode may hold a pointer to a cache of these layout
@@ -25,7 +27,8 @@ the reference count, as the layout is kept around by the lseg that
 keeps it in the list.
 lsegs reference device ids, which are resolved per nfs_client and
 layout driver type.  The device ids are held in a RCU cache (struct
 nfs4_deviceid_cache).  The cache itself is referenced across each
@@ -38,24 +41,26 @@ justification, but seems reasonable given that we can have multiple
 deviceid's per filesystem, and multiple filesystems per nfs_client.
 The hash code is copied from the nfsd code base.  A discussion of
-hashing and variations of this algorithm can be found at:
+hashing and variations of this algorithm can be found `here.
 data server cache
 file driver devices refer to data servers, which are kept in a module
 level cache.  Its reference is held over the lifetime of the deviceid
 pointing to it.
 lseg maintains an extra reference corresponding to the NFS_LSEG_VALID
 bit which holds it in the pnfs_layout_hdr's list.  When the final lseg
 is removed from the pnfs_layout_hdr's list, the NFS_LAYOUT_DESTROYED
 bit is set, preventing any new lsegs from being added.
 layout drivers
 PNFS utilizes what is called layout drivers. The STD defines 4 basic
 layout types: "files", "objects", "blocks", and "flexfiles". For each
@@ -68,6 +73,6 @@ Blocks-layout-driver code is in: fs/nfs/blocklayout/.. directory
 Flexfiles-layout-driver code is in: fs/nfs/flexfilelayout/.. directory
 blocks-layout setup
 TODO: Document the setup needs of the blocks layout driver

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