| Commit message (Collapse) | Author | Age | Files | Lines |
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There are three types of messages between w1 core and userspace:
1. Events. They are generated each time new master or slave device found
either due to automatic or requested search.
2. Userspace commands. Includes read/write and search/alarm search comamnds.
3. Replies to userspace commands.
From: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Special file in each w1 slave device's directory called "rw" is created
each time new slave and no appropriate w1 family is registered.
"rw" file supports read and write operations, which allows to perform
almost any kind of operations. Each logical operation is a transaction
in nature, which can contain several (two or one) low-level operations.
Let's see how one can read EEPROM context:
1. one must write control buffer, i.e. buffer containing command byte
and two byte address. At this step bus is reset and appropriate device
is selected using either W1_SKIP_ROM or W1_MATCH_ROM command.
Then provided control buffer is being written to the wire.
2. reading. This will issue reading eeprom response.
It is possible that between 1. and 2. w1 master thread will reset bus for
searching and slave device will be even removed, but in this case 0xff will
be read, since no device was selected.
Signed-off-by: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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* git://oss.sgi.com:8090/xfs-2.6: (43 commits)
[XFS] Remove files from the build that are now unused.
[XFS] Fix a Makefile issue related to exports.o handling.
[XFS] Remove version 1 directory code. Never functioned on Linux, just
[XFS] Map EFSCORRUPTED to an actual error code, not just a made up one
[XFS] Kill direct access to ->count in valusema(); all we ever use it for
[XFS] Remove unneeded conditional code on NFS export interface related
[XFS] Remove an incorrect use of unlikely() on a relatively likely code
[XFS] Push some common code out of write path into core XFS code for
[XFS] Remove unnecessary local from open_exec dmapi path.
[XFS] Minor XFS documentation updates.
[XFS] Fix broken const use inside local suffix_strtoul routine.
[XFS] Fix nused counter. It's currently getting set to -1 rather than
[XFS] Fix mismerge of the fs_writable cleanup patch causing a freeze/thaw
[XFS] Fix up debug code so that bulkstat wont generate thousands of
[XFS] Remove unused parameter from di2xflags routine.
[XFS] Cleanup a missed porting conversion, and freezing.
[XFS] Resolve a namespace collision on remaining vtypes for FreeBSD
[XFS] Resolve a namespace collision on vnode/vnodeops for FreeBSD porters.
[XFS] Resolve a namespace collision on vfs/vfsops for FreeBSD porters.
[XFS] statvfs component of directory/project quota support, code
...
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Signed-off-by: Nathan Scott <nathans@sgi.com>
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Signed-off-by: Nathan Scott <nathans@sgi.com>
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pure bloat.
SGI-PV: 952969
SGI-Modid: xfs-linux-melb:xfs-kern:26251a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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(990). Turns out some ye-olde unices used EUCLEAN as
Filesystem-needs-cleaning, so now we use that too.
SGI-PV: 953954
SGI-Modid: xfs-linux-melb:xfs-kern:26286a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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is check if semaphore is actually locked, which can be trivially done in
portable way. Code gets more reabable, while we are at it...
SGI-PV: 953915
SGI-Modid: xfs-linux-melb:xfs-kern:26274a
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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code paths.
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26250a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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path.
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26249a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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sharing.
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26248a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26247a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26201a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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getting decremented by 1. Since nused never reaches 0, the "if
(!free->hdr.nused)" check in xfs_dir2_leafn_remove() fails every time and
xfs_dir2_shrink_inode() doesn't get called when it should. This causes
extra blocks to be left on an empty directory and the directory in unable
to be converted back to inline extent mode.
SGI-PV: 951958
SGI-Modid: xfs-linux-melb:xfs-kern:211382a
Signed-off-by: Mandy Kirkconnell <alkirkco@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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test hang.
SGI-PV: 953563
SGI-Modid: xfs-linux-melb:xfs-kern:26182a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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fsstress warnings.
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26111a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 904192
SGI-Modid: xfs-linux-melb:xfs-kern:26110a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 953338
SGI-Modid: xfs-linux-melb:xfs-kern:26109a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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porters.
SGI-PV: 953338
SGI-Modid: xfs-linux-melb:xfs-kern:26108a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 953338
SGI-Modid: xfs-linux-melb:xfs-kern:26107a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 9533338
SGI-Modid: xfs-linux-melb:xfs-kern:26106a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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originally by Glen.
SGI-PV: 932952
SGI-Modid: xfs-linux-melb:xfs-kern:26105a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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interface.
SGI-PV: 953338
SGI-Modid: xfs-linux-melb:xfs-kern:26103a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26102a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26101a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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truncate down followed by delayed allocation (buffered writes) - worst
case scenario for the notorious NULL files problem. This reduces the
window where we are exposed to that problem significantly.
SGI-PV: 917976
SGI-Modid: xfs-linux-melb:xfs-kern:26100a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 953338
SGI-Modid: xfs-linux-melb:xfs-kern:26099a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26097a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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shutdown vop flags consistent with sync vop flags declarations too.
SGI-PV: 939911
SGI-Modid: xfs-linux-melb:xfs-kern:26096a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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layers.
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26095a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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anymore here.
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26094a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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init_rwsem() has no return value. This is not a problem if init_rwsem()
is a function, but it's a problem if it's a do { ... } while (0) macro.
(which lockdep introduces)
SGI-PV: 904196
SGI-Modid: xfs-linux-melb:xfs-kern:26082a
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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logged version of di_next_unlinked which is actually always stored in the
correct ondisk format. This was pointed out to us by Shailendra Tripathi.
And is evident in the xfs qa test of 121.
SGI-PV: 953263
SGI-Modid: xfs-linux-melb:xfs-kern:26044a
Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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transaction completion from marking the inode dirty while it is being
cleaned up on it's way out of the system.
SGI-PV: 952967
SGI-Modid: xfs-linux-melb:xfs-kern:26040a
Signed-off-by: David Chinner <dgc@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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64bit kernels allow recovery to handle both versions and do the necessary
decoding
SGI-PV: 952214
SGI-Modid: xfs-linux-melb:xfs-kern:26011a
Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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transaction within each such operation may involve multiple locking of AGF
buffer. While the freeing extent function has sorted the extents based on
AGF number before entering into transaction, however, when the file system
space is very limited, the allocation of space would try every AGF to get
space allocated, this could potentially cause out-of-order locking, thus
deadlock could happen. This fix mitigates the scarce space for allocation
by setting aside a few blocks without reservation, and avoid deadlock by
maintaining ascending order of AGF locking.
SGI-PV: 947395
SGI-Modid: xfs-linux-melb:xfs-kern:210801a
Signed-off-by: Yingping Lu <yingping@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 953061
SGI-Modid: xfs-linux-melb:xfs-kern:25986a
Signed-off-by: Barry Naujok <bnaujok@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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mmap only.
SGI-PV: 952736
SGI-Modid: xfs-linux-melb:xfs-kern:25922a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 907752
SGI-Modid: xfs-linux-melb:xfs-kern:25921a
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 952291
SGI-Modid: xfs-linux-melb:xfs-kern:209807a
Signed-off-by: Mandy Kirkconnell <alkirkco@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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ATTR_NOLOCK flag, but this was split off some time ago, as ATTR_DMI needed
to be used separately. Two asserts were added to guard correctness of the
code during the transition. These are no longer required.
SGI-PV: 952145
SGI-Modid: xfs-linux-melb:xfs-kern:209633a
Signed-off-by: Olaf Weber <olaf@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 943272
SGI-Modid: xfs-linux-melb:xfs-kern:25808a
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 943272
SGI-Modid: xfs-linux-melb:xfs-kern:25807a
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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SGI-PV: 943272
SGI-Modid: xfs-linux-melb:xfs-kern:25806a
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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the range spanned by modifications to the in-core extent map. Add
XFS_BUNMAPI() and XFS_SWAP_EXTENTS() macros that call xfs_bunmapi() and
xfs_swap_extents() via the ioops vector. Change all calls that may modify
the in-core extent map for the data fork to go through the ioops vector.
This allows a cache of extent map data to be kept in sync.
SGI-PV: 947615
SGI-Modid: xfs-linux-melb:xfs-kern:209226a
Signed-off-by: Olaf Weber <olaf@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
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Now /sys/class/usb is dynamically created when we have something to put
in it, and removed when all devices go away.
Just trying to cut down on the clutter in sysfs...
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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