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This idea is from ext4. By this patch, we can make the dio write parallel, and improve the performance. We needn''t worry about the race between dio write and truncate, because the truncate need wait untill all the dio write end. And we also needn''t worry about the race between dio write and punch hole, because we have extent lock to protect our operation. I ran fio to test the performance...

....h @@ -1360,6 +1360,17 @@ struct btrfs_fs_info { wait_queue_head_t transaction_blocked_wait; wait_queue_head_t async_submit_wait; + /* + * Used to protect the incompat_flags, compat_flags, compat_ro_flags + * when they are updated. + * + * Because we do not clear the flags for ever, so we needn''t use + * the lock on the read side. + * + * We also needn''t use the lock when we mount the fs, because + * there is no other task which will update the flag. + */ + spinlock_t super_lock; struct btrfs_super_block *super_copy; struct btrfs_super_block *super_for_commit;...

Hello, I just had a problem with someone cusing on my rail app now is there somthing like Red Cloth that I can use to disable ''dirty words'' -- Posted via http://www.ruby-forum.com/.

If pass-through field in extended capability register is set, set pass-through translation type for Dom0, that means DMA requests with Untranslated addresses are processed as pass-through in Dom0, needn''t translate DMA requests through a multi-level page-table. Signed-off-by: Anthony Xu <anthony.xu@intel.com> Signed-off-by: Weidong Han <weidong.han@intel.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xe...

i found model allway query this sql: SHOW FIELDS FROM test_table if my code needn''t know table structure, how to remove it? -- Posted via http://www.ruby-forum.com/.

I''ve just begin using rspec stories, and i m encountering some problems. In my application i have different subdomains in which specific users can log in, for example an admin will go to admin.myapp.com/authenticate/login, and an user belonging to a specific company will log in company.myapp.com/authenticate/login, and of course both have a different login process. To perform some

fs/ocfs2/dir.c: In function ?ocfs2_extend_dir?: fs/ocfs2/dir.c:2700: warning: ?ret? may be used uninitialized in this function fs/ocfs2/suballoc.c: In function ?ocfs2_get_suballoc_slot_bit?: fs/ocfs2/suballoc.c:2216: warning: comparison is always true due to limited range of data type Signed-off-by: Tao Ma <tao.ma at oracle.com> --- fs/ocfs2/dir.c | 2 +- fs/ocfs2/suballoc.c |

I''m looking to drive the development of a rails app that does nothing but serve a JSON API. All of the models are well tested elsewhere, so I needn''t worry about that. My only immediate goal is to be able to fire off requests to a path and check the returned JSON. I''ve tried a number of methods for this today, without being particularly enthused about any of them. I started with user stories, but the conversion to english w...

...(umount-mount, not -o remount), the pre-allocated extent will be dropped. This patch modified the relative functions of the truncation, and makes the truncation update i_size and disk_i_size of i-nodes every time we drop the file extent successfully, and set them to the real value. By this way, we needn''t add orphan items to guarantee the consistency of the meta-data. By this patch, it is possible that the file may not be truncated to the size that the user expects(may be <= the orignal size and >= the expected one), so I think it is better that we shouldn''t lose the data...

When ir_ctrl->iremap_index == -1, it means there is no remap entry. So it needn''t to convert from remap format to normal ioapic format. Signed-off-by: Weidong Han <weidong.han@intel.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel

...oc file. */ - started = try_to_writeback_inodes_sb_nr(sb, nr_pages, - WB_REASON_FS_FREE_SPACE); - if (!started) { + if (down_read_trylock(&sb->s_umount)) { + writeback_inodes_sb_nr(sb, nr_pages, WB_REASON_FS_FREE_SPACE); + up_read(&sb->s_umount); + } else { /* * We needn''t worry the filesystem going from r/w to r/o though * we don''t acquire ->s_umount mutex, because the filesystem -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majord...

Hello ~ I am using the Capistrano recipe outlined in this post to restart my backgroundrb server: http://rubyforge.org/pipermail/backgroundrb-devel/2007-February/000718.html My Version: ~~~~~~~~~~~~ task :before_restart, :roles => :app do restart_backgroundrb end task :start_backgroundrb, :roles => :app do sudo "nohup

...by using try_to_writeback_inodes_sb_nr(), this function will try to get sb->s_umount, if fail, it won''t do any writeback. At this time, In order to get enough space to reserve successfully, we will use the sync function of btrfs to sync all the delalloc file. This operation is safe, we needn''t worry about the case that the filesystem goes from r/w to r/o. because the filesystem should guarantee all the dirty pages have been written into the disk after it becomes readonly, so the sync operation will do nothing if the filesystem is already readonly. Though it may waste lots of t...

Whenever I change the sound driver from ALSA to OSS in winecfg all of my steam games are muted. Some of the games doesn't even start, some of them start but are totally silent with OSS. I installed a couple of non-steam games into the same wineprefix, interestingly they can use both sound systems. So this issue is applied only to steam games. If I apply the WINEDEBUG=+dsound parameter when

Hi. There are many ways of doing validation but I''m trying to think of the cleanest way without making the action code unclean. Would it be advisable to do validation on the incoming params hash rather than waiting to setup an object you are about to save and calling ojb.valid? before saving? Or even going as far as trying to save the object but failing from the model''s

It seems that using a join model that joins with two has_many''s will fail to generate proper SQL class StudentSemesterRecord < ActiveRecord::Base belongs_to :semester has_many :discipline_records, :through => :semester end class Semester < ActiveRecord::Base has_many :student_semester_records has_many :discipline_records end class DisciplineRecord <

...nsaction handler more than 2 times. The reason is: Task use_count of trans handle commit_transaction 1 |-> btrfs_start_delalloc_inodes 1 |-> run_delalloc_nocow 1 |-> join_transaction 2 |-> cow_file_range 2 |-> join_transaction 3 In fact, cow_file_range needn''t join the transaction again because the caller have joined the transaction, so we fix this problem by this way. Reported-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Miao Xie <miaox@cn.fujitsu.com> --- fs/btrfs/inode.c | 77 +++++++++++++++++++++++++++++----------...

writeback_inodes_sb(_nr)_if_idle() is re-implemented by replacing down_read() with down_read_trylock() because - If ->s_umount is write locked, then the sb is not idle. That is writeback_inodes_sb(_nr)_if_idle() needn''t wait for the lock. - writeback_inodes_sb(_nr)_if_idle() grabs s_umount lock when it want to start writeback, it may bring us deadlock problem when doing umount. (Ex. Btrfs has such a problem, see the following URL http://marc.info/?l=linux-btrfs&m=133540923510561&w=2)...

paging mechanism clarification Hi All, The Xen uses 2 level Paging Mechanism to resolve the Virtual Addresses into frame numbers from domU.The first level is taken care by the MMU for the domU i.e translation from virtual address to the physical address just like normal paging mechanism. The second level of translation is done by the Xen hypervisor.It translates the pseduo physical address

Hi, any one help? I have puzzled by the question of device''s MMIO areas. I know a MMIO operation of guest os handled by VMM as follow steps: 1: Qemu-dm does its initialization and presents virtual devices for guest os. 2: virtual bios executes PCI_setup, it will scan the pci bus and get configure space of all devices,then virtual bios allocation system resources(like port I/O range,MMIO