Diffstat (limited to 'Documentation/filesystems/journalling.rst')
1 files changed, 33 insertions, 33 deletions
diff --git a/Documentation/filesystems/journalling.rst b/Documentation/filesystems/journalling.rst
index 58ce6b395206..7e2be2faf653 100644
@@ -10,27 +10,27 @@ Details
The journalling layer is easy to use. You need to first of all create a
journal_t data structure. There are two calls to do this dependent on
how you decide to allocate the physical media on which the journal
-resides. The :c:func:`jbd2_journal_init_inode` call is for journals stored in
-filesystem inodes, or the :c:func:`jbd2_journal_init_dev` call can be used
+resides. The jbd2_journal_init_inode() call is for journals stored in
+filesystem inodes, or the jbd2_journal_init_dev() call can be used
for journal stored on a raw device (in a continuous range of blocks). A
journal_t is a typedef for a struct pointer, so when you are finally
-finished make sure you call :c:func:`jbd2_journal_destroy` on it to free up
+finished make sure you call jbd2_journal_destroy() on it to free up
any used kernel memory.
Once you have got your journal_t object you need to 'mount' or load the
journal file. The journalling layer expects the space for the journal
was already allocated and initialized properly by the userspace tools.
-When loading the journal you must call :c:func:`jbd2_journal_load` to process
+When loading the journal you must call jbd2_journal_load() to process
journal contents. If the client file system detects the journal contents
does not need to be processed (or even need not have valid contents), it
-may call :c:func:`jbd2_journal_wipe` to clear the journal contents before
+may call jbd2_journal_wipe() to clear the journal contents before
Note that jbd2_journal_wipe(..,0) calls
-:c:func:`jbd2_journal_skip_recovery` for you if it detects any outstanding
-transactions in the journal and similarly :c:func:`jbd2_journal_load` will
-call :c:func:`jbd2_journal_recover` if necessary. I would advise reading
-:c:func:`ext4_load_journal` in fs/ext4/super.c for examples on this stage.
+jbd2_journal_skip_recovery() for you if it detects any outstanding
+transactions in the journal and similarly jbd2_journal_load() will
+call jbd2_journal_recover() if necessary. I would advise reading
+ext4_load_journal() in fs/ext4/super.c for examples on this stage.
Now you can go ahead and start modifying the underlying filesystem.
@@ -39,57 +39,57 @@ You still need to actually journal your filesystem changes, this is done
by wrapping them into transactions. Additionally you also need to wrap
the modification of each of the buffers with calls to the journal layer,
so it knows what the modifications you are actually making are. To do
-this use :c:func:`jbd2_journal_start` which returns a transaction handle.
+this use jbd2_journal_start() which returns a transaction handle.
-:c:func:`jbd2_journal_start` and its counterpart :c:func:`jbd2_journal_stop`,
+jbd2_journal_start() and its counterpart jbd2_journal_stop(),
which indicates the end of a transaction are nestable calls, so you can
reenter a transaction if necessary, but remember you must call
-:c:func:`jbd2_journal_stop` the same number of times as
-:c:func:`jbd2_journal_start` before the transaction is completed (or more
+jbd2_journal_stop() the same number of times as
+jbd2_journal_start() before the transaction is completed (or more
accurately leaves the update phase). Ext4/VFS makes use of this feature to
simplify handling of inode dirtying, quota support, etc.
Inside each transaction you need to wrap the modifications to the
individual buffers (blocks). Before you start to modify a buffer you
-need to call :c:func:`jbd2_journal_get_create_access()` /
-:c:func:`jbd2_journal_get_undo_access()` as appropriate, this allows the
+need to call jbd2_journal_get_create_access() /
+jbd2_journal_get_undo_access() as appropriate, this allows the
journalling layer to copy the unmodified
data if it needs to. After all the buffer may be part of a previously
uncommitted transaction. At this point you are at last ready to modify a
buffer, and once you are have done so you need to call
-:c:func:`jbd2_journal_dirty_metadata`. Or if you've asked for access to a
+jbd2_journal_dirty_metadata(). Or if you've asked for access to a
buffer you now know is now longer required to be pushed back on the
-device you can call :c:func:`jbd2_journal_forget` in much the same way as you
-might have used :c:func:`bforget` in the past.
+device you can call jbd2_journal_forget() in much the same way as you
+might have used bforget() in the past.
-A :c:func:`jbd2_journal_flush` may be called at any time to commit and
+A jbd2_journal_flush() may be called at any time to commit and
checkpoint all your transactions.
-Then at umount time , in your :c:func:`put_super` you can then call
-:c:func:`jbd2_journal_destroy` to clean up your in-core journal object.
+Then at umount time , in your put_super() you can then call
+jbd2_journal_destroy() to clean up your in-core journal object.
Unfortunately there a couple of ways the journal layer can cause a
deadlock. The first thing to note is that each task can only have a
single outstanding transaction at any one time, remember nothing commits
-until the outermost :c:func:`jbd2_journal_stop`. This means you must complete
+until the outermost jbd2_journal_stop(). This means you must complete
the transaction at the end of each file/inode/address etc. operation you
perform, so that the journalling system isn't re-entered on another
journal. Since transactions can't be nested/batched across differing
journals, and another filesystem other than yours (say ext4) may be
modified in a later syscall.
-The second case to bear in mind is that :c:func:`jbd2_journal_start` can block
+The second case to bear in mind is that jbd2_journal_start() can block
if there isn't enough space in the journal for your transaction (based
on the passed nblocks param) - when it blocks it merely(!) needs to wait
for transactions to complete and be committed from other tasks, so
-essentially we are waiting for :c:func:`jbd2_journal_stop`. So to avoid
-deadlocks you must treat :c:func:`jbd2_journal_start` /
-:c:func:`jbd2_journal_stop` as if they were semaphores and include them in
+essentially we are waiting for jbd2_journal_stop(). So to avoid
+deadlocks you must treat jbd2_journal_start() /
+jbd2_journal_stop() as if they were semaphores and include them in
your semaphore ordering rules to prevent
-deadlocks. Note that :c:func:`jbd2_journal_extend` has similar blocking
-behaviour to :c:func:`jbd2_journal_start` so you can deadlock here just as
-easily as on :c:func:`jbd2_journal_start`.
+deadlocks. Note that jbd2_journal_extend() has similar blocking
+behaviour to jbd2_journal_start() so you can deadlock here just as
+easily as on jbd2_journal_start().
Try to reserve the right number of blocks the first time. ;-). This will
be the maximum number of blocks you are going to touch in this
@@ -116,8 +116,8 @@ called after each transaction commit. You can also use
that need processing when the transaction commits.
JBD2 also provides a way to block all transaction updates via
-:c:func:`jbd2_journal_unlock_updates()`. Ext4 uses this when it wants a
+jbd2_journal_unlock_updates(). Ext4 uses this when it wants a
window with a clean and stable fs for a moment. E.g.