Commit graph

45 commits

Author SHA1 Message Date
David Woodhouse
61c4b23770 [JFFS2] Handle inodes with only a single metadata node with non-zero isize
This should never happen unless there's corruption on the medium and the
actual data nodes go missing. But the failure mode (an oops when we assume
the fragtree isn't empty and go looking for its last node) isn't useful.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-04-25 17:04:23 +01:00
David Woodhouse
c00c310eac [JFFS2] Tidy up licensing/copyright boilerplate.
In particular, remove the bit in the LICENCE file about contacting
Red Hat for alternative arrangements. Their errant IS department broke
that arrangement a long time ago -- the policy of collecting copyright
assignments from contributors came to an end when the plug was pulled on
the servers hosting the project, without notice or reason.

We do still dual-license it for use with eCos, with the GPL+exception
licence approved by the FSF as being GPL-compatible. It's just that nobody
has the right to license it differently.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-04-25 14:16:47 +01:00
David Woodhouse
df8e96f391 [JFFS2] Improve read_inode memory usage, v2.
We originally used to read every node and allocate a jffs2_tmp_dnode_info
structure for each, before processing them in (reverse) version order
and discarding the ones which are obsoleted by later nodes.

With huge logfiles, this behaviour caused memory problems. For example, a
file involved in OLPC trac #1292 has 1822391 nodes, and would cause the XO
machine to run out of memory during the first stage of read_inode().

Instead of just inserting nodes into a tree in version order as we find
them, we now put them into a tree in order of their offset within the
file, which allows us to immediately discard nodes which are completely
obsoleted.

We don't use a full tree with 'fragments' pointing to the real data
structure, as we do in the normal fragtree. We sort only on the start
address, and add an 'overlapped' flag to the tmp_dnode_info to indicate
that the node in question is (partially) overlapped by another.

When the scan is complete, we start at the end of the file, adding each
node to a real fragtree as before. Where the node is non-overlapped, we
just add it (it doesn't matter that it's not the latest version; there is
no overlap). When the node at the end of the tree _is_ overlapped, we sort
it and all its overlapping nodes into version order and then add them to
the fragtree in that order.

This 'early discard' reduces the peak allocation of tmp_dnode_info
structures from 1.8M to a mere 62872 (3.5%) in the degenerate case
referenced above.

This version of the patch also correctly rememembers the highest node
version# seen for an inode when it's scanned.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-04-25 03:23:42 +01:00
David Woodhouse
566865a2a4 [JFFS2] Fix cross-endian build.
When compiling a LE-capable JFFS2 on PowerPC, wbuf.c fails to compile:

fs/jffs2/wbuf.c:973: error: braced-group within expression allowed only inside a function
fs/jffs2/wbuf.c:973: error: initializer element is not constant
fs/jffs2/wbuf.c:973: error: (near initialization for ‘oob_cleanmarker.magic’)
fs/jffs2/wbuf.c:974: error: braced-group within expression allowed only inside a function
fs/jffs2/wbuf.c:974: error: initializer element is not constant
fs/jffs2/wbuf.c:974: error: (near initialization for ‘oob_cleanmarker.nodetype’)
fs/jffs2/wbuf.c:975: error: braced-group within expression allowed only inside a function
fs/jffs2/wbuf.c:976: error: initializer element is not constant
fs/jffs2/wbuf.c:976: error: (near initialization for ‘oob_cleanmarker.totlen’)

Provide constant_cpu_to_je{16,32} functions, and use them for initialising the
offending structure.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2007-04-23 12:07:17 +01:00
Akinobu Mita
ea7415cca9 [JFFS2] Use rb_first() and rb_last() cleanup
Use rb_first() and rb_last() to implement frag_first() and frag_last().

Signed-off-by: Akinbou Mita <akinobu.mita@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-10-21 16:21:40 +01:00
Adrian Bunk
90a18fab4a make fs/jffs2/nodelist.c:jffs2_obsolete_node_frag() static
This patch makes the needlessly global jffs2_obsolete_node_frag()
static.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-07-07 00:02:10 +01:00
Linus Torvalds
0d1782144e Merge git://git.infradead.org/mtd-2.6
* git://git.infradead.org/mtd-2.6:
  [JFFS2][XATTR] Fix memory leak in POSIX-ACL support
  fs/jffs2/: make 2 functions static
  [MTD] NAND: Fix broken sharpsl driver
  [JFFS2][XATTR] Fix xd->refcnt race condition
  MTD: kernel-doc fixes + additions
  MTD: fix all kernel-doc warnings
  [MTD] DOC: Fixup read functions and do a little cleanup
2006-07-03 21:29:08 -07:00
Jörn Engel
6ab3d5624e Remove obsolete #include <linux/config.h>
Signed-off-by: Jörn Engel <joern@wohnheim.fh-wedel.de>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
2006-06-30 19:25:36 +02:00
Adrian Bunk
c05d52c748 fs/jffs2/: make 2 functions static
This patch makes two needlessly global functions static.

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-06-29 23:08:49 +01:00
Linus Torvalds
2edc322d42 Merge git://git.infradead.org/~dwmw2/rbtree-2.6
* git://git.infradead.org/~dwmw2/rbtree-2.6:
  [RBTREE] Switch rb_colour() et al to en_US spelling of 'color' for consistency
  Update UML kernel/physmem.c to use rb_parent() accessor macro
  [RBTREE] Update hrtimers to use rb_parent() accessor macro.
  [RBTREE] Add explicit alignment to sizeof(long) for struct rb_node.
  [RBTREE] Merge colour and parent fields of struct rb_node.
  [RBTREE] Remove dead code in rb_erase()
  [RBTREE] Update JFFS2 to use rb_parent() accessor macro.
  [RBTREE] Update eventpoll.c to use rb_parent() accessor macro.
  [RBTREE] Update key.c to use rb_parent() accessor macro.
  [RBTREE] Update ext3 to use rb_parent() accessor macro.
  [RBTREE] Change rbtree off-tree marking in I/O schedulers.
  [RBTREE] Add accessor macros for colour and parent fields of rb_node
2006-06-20 14:51:22 -07:00
David Woodhouse
9bfeb691e7 [JFFS2] Switch to using an array of jffs2_raw_node_refs instead of a list.
This allows us to drop another pointer from the struct jffs2_raw_node_ref,
shrinking it to 8 bytes on 32-bit machines (if the TEST_TOTLEN) paranoia
check is turned off, which will be committed soon).

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-26 21:19:05 +01:00
David Woodhouse
046b8b9808 [JFFS2] Add 'jeb' argument to jffs2_prealloc_raw_node_refs()
Preallocation of refs is shortly going to be a per-eraseblock thing,
rather than per-filesystem. Add the required argument to the function.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-25 01:50:35 +01:00
David Woodhouse
c38c1b613d [JFFS2] jffs2_free_all_node_refs() doesn't free them all. Rename it.
... to jffs2_free_jeb_node_refs() since that's what it does.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-25 01:38:27 +01:00
David Woodhouse
99988f7bbd [JFFS2] Introduce ref_next() macro for finding next physical node
Another part of the preparation for switching to an array...

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-24 09:04:17 +01:00
David Woodhouse
2f785402f3 [JFFS2] Reduce visibility of raw_node_ref to upper layers of JFFS2 code.
As the first step towards eliminating the ref->next_phys member and saving
memory by using an _array_ of struct jffs2_raw_node_ref per eraseblock,
stop the write functions from allocating their own refs; have them just
_reserve_ the appropriate number instead. Then jffs2_link_node_ref() can
just fill them in.

Use a linked list of pre-allocated refs in the superblock, for now. Once
we switch to an array, it'll just be a case of extending that array.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-24 02:04:45 +01:00
David Woodhouse
9fe4854cd1 [JFFS2] Remove flash offset argument from various functions.
We don't need the upper layers to deal with the physical offset. It's
_always_ c->nextblock->offset + c->sector_size - c->nextblock->free_size
so we might as well just let the actual write functions deal with that.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-23 00:38:06 +01:00
David Woodhouse
987d47b71a [JFFS2] Put list of nodes in common part of ic/x_ref/x_datum structure
We'll be using a proper list of nodes in the jffs2_xattr_datum and
jffs2_xattr_ref structures, because the existing code to overwrite
them is just broken. Put it in the common part at the front of the
structure which is shared with the jffs2_inode_cache, so that the
jffs2_link_node_ref() function can do the right thing.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 16:32:05 +01:00
David Woodhouse
fcb7578719 [JFFS2] Extend jffs2_link_node_ref() to link into per-inode list too.
Let's avoid the potential for forgetting to set ref->next_in_ino, by doing
it within jffs2_link_node_ref() instead.

This highlights the ugliness of what we're currently doing with
xattr_datum and xattr_ref structures -- we should find a nicer way of
dealing with that.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-22 15:23:10 +01:00
David Woodhouse
ca89a517fa [JFFS2] Finally eliminate __totlen field from struct jffs2_raw_node_ref
Well, almost. We'll actually keep a 'TEST_TOTLEN' macro set for now, and keep
doing some paranoia checks to make sure it's all working correctly. But if
TEST_TOTLEN is unset, the size of struct jffs2_raw_node_ref drops from 16
bytes to 12 on 32-bit machines. That's a saving of about half a megabyte of
memory on the OLPC prototype board, with 125K or so nodes in its 512MiB of
flash.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 13:29:11 +01:00
David Woodhouse
b64335f2b7 [JFFS2] Add length argument to jffs2_add_physical_node_ref()
If __totlen is going away, we need to pass the length in separately.
Also stop callers from needlessly setting ref->next_phys to NULL,
since that's done for them... and since that'll also be going away soon.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 04:36:45 +01:00
David Woodhouse
68270995f2 [JFFS2] Introduce jffs2_scan_dirty_space() function.
To eliminate the __totlen field from struct jffs2_raw_node_ref, we need
to allocate nodes for dirty space instead of just tweaking the accounting
data. Introduce jffs2_scan_dirty_space() in preparation for that.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 03:46:05 +01:00
David Woodhouse
7807ef7ba2 [JFFS2] Fix summary handling of unknown but compatible nodes.
For RWCOMPAT and ROCOMPAT nodes, we should still allow the mount to
succeed. Just abandon the summary and fall through to the full scan.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 03:45:27 +01:00
David Woodhouse
6171586a7a [JFFS2] Correct handling of JFFS2_FEATURE_RWCOMPAT_COPY nodes.
We should preserve these when we come to garbage collect them, not let
them get erased. Use jffs2_garbage_collect_pristine() for this, and make
sure the summary code copes -- just refrain from writing a summary for any
block which contains a node we don't understand.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-21 00:02:06 +01:00
David Woodhouse
f1f9671bd8 [JFFS2] Introduce jffs2_link_node_ref() function to reduce code duplication
The same sequence of code was repeated in many places, to add a new
struct jffs2_raw_node_ref to an eraseblock and adjust the space accounting
accordingly. Move it out-of-line.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 19:45:26 +01:00
David Woodhouse
0cfc7da3ff Merge git://git.infradead.org/jffs2-xattr-2.6
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-20 17:27:32 +01:00
David Woodhouse
aef9ab4784 [JFFS2] Support new device nodes
Device node major/minor numbers are just stored in the payload of a single
data node. Just extend that to 4 bytes and use new_encode_dev() for it.

We only use the 4-byte format if we _need_ to, if !old_valid_dev(foo).
This preserves backwards compatibility with older code as much as
possible. If we do make devices with major or minor numbers above 255, and
then mount the file system with the old code, it'll just read the first
two bytes and get the numbers wrong. If it comes to garbage-collect it,
it'll then write back those wrong numbers. But that's about the best we
can expect.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-19 00:28:49 +01:00
KaiGai Kohei
8f2b6f49c6 [JFFS2][XATTR] Remove 'struct list_head ilist' from jffs2_inode_cache.
This patch can reduce 4-byte of memory usage per inode_cache.

[4/10] jffs2-xattr-v5.1-04-remove_ilist_from_ic.patch

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
2006-05-13 15:15:07 +09:00
KaiGai Kohei
aa98d7cf59 [JFFS2][XATTR] XATTR support on JFFS2 (version. 5)
This attached patches provide xattr support including POSIX-ACL and
SELinux support on JFFS2 (version.5).

There are some significant differences from previous version posted
at last December.
The biggest change is addition of EBS(Erase Block Summary) support.
Currently, both kernel and usermode utility (sumtool) can recognize
xattr nodes which have JFFS2_NODETYPE_XATTR/_XREF nodetype.

In addition, some bugs are fixed.
- A potential race condition was fixed.
- Unexpected fail when updating a xattr by same name/value pair was fixed.
- A bug when removing xattr name/value pair was fixed.

The fundamental structures (such as using two new nodetypes and exclusion
mechanism by rwsem) are unchanged. But most of implementation were reviewed
and updated if necessary.
Espacially, we had to change several internal implementations related to
load_xattr_datum() to avoid a potential race condition.

[1/2] xattr_on_jffs2.kernel.version-5.patch
[2/2] xattr_on_jffs2.utils.version-5.patch

Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com>
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-13 15:09:47 +09:00
David Woodhouse
cbb9a56177 Move jffs2_fs_i.h and jffs2_fs_sb.h from include/linux/ to fs/jffs2/
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-05-03 13:07:27 +01:00
David Woodhouse
21f1d5fc59 [RBTREE] Update JFFS2 to use rb_parent() accessor macro.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>
2006-04-21 13:17:57 +01:00
Thomas Gleixner
182ec4eee3 [JFFS2] Clean up trailing white spaces
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-07 14:18:56 +01:00
Ferenc Havasi
e631ddba58 [JFFS2] Add erase block summary support (mount time improvement)
The goal of summary is to speed up the mount time. Erase block summary (EBS)
stores summary information at the end of every (closed) erase block. It is
no longer necessary to scan all nodes separetly (and read all pages of them)
just read this "small" summary, where every information is stored which is
needed at mount time.

This summary information is stored in a JFFS2_FEATURE_RWCOMPAT_DELETE. During
the mount process if there is no summary info the orignal scan process will
be executed. EBS works with NAND and NOR flashes, too.

There is a user space tool called sumtool to generate this summary
information for a JFFS2 image.

Signed-off-by: Ferenc Havasi <havasi@inf.u-szeged.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 21:29:48 +01:00
Ferenc Havasi
4ce1f56218 [JFFS2] Remove support for virtual blocks
Remove support for virtual blocks, which are build by
concatenation of multiple physical erase blocks.

For more information please read the MTD mailing list thread
"[PATCH] remove support for virtual blocks"

Signed-off-by: Ferenc Havasi <havasi@inf.u-szeged.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 21:08:27 +01:00
Artem B. Bityutskiy
3a69e0cd22 [JFFS2] Fix JFFS2 [mc]time handling
From: David Woodhouse <dwmw2@infradead.org>

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 20:25:59 +01:00
Artem B. Bityutskiy
1e0da3cb6c [JFFS2] Build fragtree in reverse order
Instead of building fragtree starting from node with the smallest version
number, start from the highest. This helps to avoid reading and checking
obsolete nodes.

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 18:22:17 +01:00
Artem B. Bityutskiy
1e900979a7 [JFFS2] Move another fragtree-related function to nodelist.c
Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 18:11:59 +01:00
Artem B. Bityutskiy
f97117d153 [JFFS2] Move scattered function into related files
Move functions to read inodes into readinode.c
Move functions to handle fragtree and dentry lists into nodelist.[ch]

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 17:50:45 +01:00
Artem B. Bityutskiy
f302cd028c [JFFS2] Namespace clean up
Rename functions to a name matching the functionality.
Remove stall debug code

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 17:17:32 +01:00
Artem B. Bityutskiy
e0c8e42f8f [JFFS2] Debug code clean up - step 3
Various simplifiactions. printk format corrections.
Convert more code to use the new debug functions.

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 17:06:49 +01:00
Artem B. Bityutskiy
730554d946 [JFFS2] Debug code clean up - step 1
Move debug functions into a seperate source file

Signed-off-by: Artem B. Bityutskiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-11-06 16:21:25 +01:00
David Woodhouse
9dee7503ce [JFFS2] Optimise jffs2_add_tn_to_list
Use an rbtree instead of a simple linked list. We were wasting 
an amazing amount of time in jffs2_add_tn_to_list(). 
Thanks to Artem Bityuckiy and Jarkko Jlavinen  for noticing.

Signed-off-by: David Woodhouse <dwmw2@infradead.org> 
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-07-06 14:07:54 +02:00
Artem B. Bityuckiy
8557fd51c2 [JFFS2] Fix race in garbage collector
Fix the race problem described here:
http://lists.infradead.org/pipermail/linux-mtd/2005-April/012361.html

Signed-off-by: Artem B. Bityuckiy <dedekind@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-05-23 13:16:47 +02:00
David Woodhouse
67e345d17f [JFFS2] Prevent ino cache removal for inodes in use
Don't remove inocache for inodes which are in read_inode() or
clear_inode() until they're done.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-05-23 12:46:14 +02:00
Andrew Victor
2f82ce1eb6 [JFFS2] Use a single config option for write buffer support
This patch replaces the current CONFIG_JFFS2_FS_NAND, CONFIG_JFFS2_FS_NOR_ECC
and CONFIG_JFFS2_FS_DATAFLASH with a single configuration option -
CONFIG_JFFS2_FS_WRITEBUFFER.

The only functional change of this patch is that the slower div/mod
calculations for SECTOR_ADDR(), PAGE_DIV() and PAGE_MOD() are now always
used when CONFIG_JFFS2_FS_WRITEBUFFER is enabled.

Signed-off-by: Andrew Victor <andrew@sanpeople.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2005-05-23 12:29:43 +02:00
Linus Torvalds
1da177e4c3 Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00