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• prevent filesystem from entering read-only mode

  - by user788171

  I have found that my server's filesystem is continuously entering read-only mode. There have been some issues with the raid1 array, but I have removed the bad disk from the array. However, it is still physically plugged into the system because I haven't had a chance to go over to the datacentre, I suspect udev and the system kernel is still picking up the bad disk and throwing errors. In /var/log/messages, there are errors like this: Mar 2 06:53:14 nocloud kernel: ata1: exception Emask 0x10 SAct 0x0 SErr 0x4010000 action 0xe frozen Mar 2 06:53:14 nocloud kernel: ata1: irq_stat 0x00400040, connection status changed Mar 2 06:53:14 nocloud kernel: ata1: SError: { PHYRdyChg DevExch } Mar 2 06:53:14 nocloud kernel: ata1: hard resetting link Mar 2 06:53:20 nocloud kernel: ata1: link is slow to respond, please be patient (ready=0) Mar 2 06:53:21 nocloud kernel: ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Mar 2 06:53:21 nocloud kernel: ata1.00: configured for UDMA/133 Mar 2 06:53:21 nocloud kernel: ata1: EH complete This happens fairly randomly throughout the day until eventually the filesystem becomes read-only. When this happens, my system becomes non-operational which kind of defeats the purpose of having a raid1. Note, ata1 is the bad disk (I think ata1 corresponds to /dev/sda because they are both first in line). Under mdadm, /dev/sda1,2 is no longer being used, but I can't prevent the system kernel from continuing to query that disk when I am no longer using it and throwing these errors. Is there a way to prevent my filesystem from automatically going into read-only mode? Furthermore, is it safe to do so? Thanks in advance. EDIT: Additional information: output from cat /proc/mdstat md1 : active raid1 sdb2[1] 976554876 blocks super 1.1 [2/1] [_U] bitmap: 5/8 pages [20KB], 65536KB chunk md0 : active raid1 sdb1[1] 204788 blocks super 1.0 [2/1] [_U] Output from mount: /dev/mapper/VolGroup-LogVol00 on / type ext4 (rw,noatime) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0") /dev/md0 on /boot type ext4 (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) EDIT2: pvdisplay output: --- Physical volume --- PV Name /dev/md1 VG Name VolGroup PV Size 931.32 GiB / not usable 2.87 MiB Allocatable yes (but full) PE Size 16.00 MiB Total PE 59604 Free PE 0 Allocated PE 59604

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• Strange performance differences in read/write from/to USB flash drive

  - by Mario De Schaepmeester

  When copying files from my 8GB USB 2.0 flash drive with Windows 7 to a traditional hard drive, the average speed is between 25 and 30 MB/s. When doing the reverse, copying to the USB drive, the speed is 5MB/s average. I have tested this with about 4.5GB of files, a mixture of smaller and larger ones. The observations were the same on both FAT32 and exFAT file systems on the USB drive, NTFS on the internal hard disk. I don't think I can be mistaken in saying that flash memory has a lot higher performance than a spinning hard drive in both terms of reading and writing. For both memory types, reading should be faster than writing too. Now I wonder, how can it be that copying files from a fast read memory to a faster write memory is actually slower than copying files from a fast read memory to a slow write memory? I think that the files are stored in RAM before being copied over too, and there's caching as well, but I don't see how even that could tip the balance. It can only be in the advantage of writing to the USB drive, since it is "closer" to the SATA system than the USB port and it will receive data from the internal SATA HDD faster. Perhaps my way of thinking is all wrong or it just depends on the manufacturer of the USB pen. But I am curious.

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• Write once, read many (WORM) using Linux file system

  - by phil_ayres

  I have a requirement to write files to a Linux file system that can not be subsequently overwritten, appended to, updated in any way, or deleted. Not by a sudo-er, root, or anybody. I am attempting to meet the requirements of the financial services regulations for recordkeeping, FINRA 17A-4, which basically requires that electronic documents are written to WORM (write once, read many) devices. I would very much like to avoid having to use DVDs or expensive EMC Centera devices. Is there a Linux file system, or can SELinux support the requirement for files to be made complete immutable immediately (or at least soon) after write? Or is anybody aware of a way I could enforce this on an existing file system using Linux permissions, etc? I understand that I can set readonly permissions, and the immutable attribute. But of course I expect that a root user would be able to unset those. I considered storing data to small volumes that are unmounted and then remounted read-only, but then I think that root could still unmount and remount as writable again. I'm looking for any smart ideas, and worst case scenario I'm willing to do a little coding to 'enhance' an existing file system to provide this. Assuming there is a file system that is a good starting point. And put in place a carefully configured Linux server to act as this type of network storage device, doing nothing else. After all of that, encryption on the files would be useful too!

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• Read only bind-mount?

  - by depesz

  I use mount -o bind to mount directories inside chroots, which works really well. The problem is that I'd like some of these bind-mounted directories to be read only in chroot. Is it possible? If not - any other way to achieve it? I was thinking about using NFS for localhost mounts, but it looks like overkill.

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• how to make a flash drive read-only on other computers

  - by Nrew

  How do I make a flash drive or a flash drive partition so that it would only be read-only and will not be affected by a virus. Maybe making the flash drive be treated as a CD on other computer so that its not possible to write any kind of data into it.

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• Moved files only opening as 'read-only' in Excel

  - by Lance Roberts

  I moved a large directory of Excel files to another machine. When I sign in as myself (administrator signing into domain) then the files open just fine, but when I sign in as a Power User directly onto the machine, the files open as 'Read-Only'. I've reset all the attributes through both Windows and DOS, but to no avail. Also I checked on the Search Indexing bug, but indexing is already turned off. Any ideas?

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• Bash - read as a fallback to $@

  - by user137369

  I have a working bash script (working on OSX) that takes files and directories as input and does something like for inputFile in $@ do [someStuff] done but I want to provide a “fallback”, meaning, if the script is started with no arguments (double-clicked, for example), it can take input at that time, by letting the user drop the files directly on the terminal (possibly through read but not mandatory, I'm open to better/different solutions). I'm guessing I should use some kind of if statement, but I'm not sure how. I'd like to not have to essentially duplicate the script's size by two by repeating [someStuff] for each case. Thank you.

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• Windows 7 external 2.5 hard drive read write permissions format

  - by user76918

  Working with Windows 7 professional. While trying to format western digital 250GB sata laptop drive; receiving error not initialized. Went to elevated command line to diskpart to clean all; received error message write protected. Went to Disk Management & Virtual disk drive shows as disk 2 not initialized. No format options available greyed out. Went back to command line tried to see attributes disk is read only. How do I take owner ship to change the permissions & format.

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• mac os x - detect file system read

  - by quano

  I want to know what files a specific application is trying to access on my disc. I know that you can use fs_usage, but this outputs events from all applications. I know that you can target a single application, but only one that is already running. I want to detect all readfile-events an application is trying to do, ever since it is started. I don't want to miss out on any event. How do you achieve this?

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• iphone app too read text files.

  - by bandito40

  Hi, Need to edit some of the local text files on my iphone but so far all the apps I have downloaded do not navigate the OS3 file tree for me to load and edit them. I need to do this on my iphone as I can no longer access via ssh or with the iphone cable. One of the files to edit is a ssh config file which is what is not allowing ssh connections. Any ideas on apps or other methods that I could use.

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• Installed Ubuntu on usb drive, now it's read-only and can't be formatted

  - by weiszam

  I installed Ubuntu (ubuntu-13.04-desktop-amd64) on a 8 gb pendrive. Because it worked pretty slow, I wanted to change it back to a normal pendrive. But this is what happened. Windows7 can't open the usb drive, can't view files or anything, can't access attributes. When I select to format, it says it can't format it because it is write-protected. Tried the same running from an Ubuntu, and trying from a booted GParted thing. When I view the partitions, they can't be deleted either. What should I do to get it formatted?

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• Read Java in as Hex

  - by James

  Hi, I have tried to solve this but I keep coming up with stuff that is no help I'm sure this is easy (when you know how of course ;) ) What I would like to do is read in a file using a byte stream like below: while((read = in.read()) != -1){ //code removed to save space Integer.toHexString(read); System.out.println(read); } When it prints out the Hex to the screen it will print out numbers fine e.g 31 13 12 0 but when it comes to a hex code that should be 01 31 it will print 0 131. I want to read it in to a variable like you would see in a hex editor i.e 00 11 21 31 no single numbers as i need to scan the whole file and look for patterns which I know how to do I'm just stuck on this :/ so in short i need a variabe to contain the two hex characters i.e int temp = 01 not int temp = 0 , I hope this all makes sense, I'm a little confused as it's 3am! If anyone knows how to do this I would be most greatful, p.s thanks for the help in advance this site has saved me loads of research and have learnt a lot! Many thanks.

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• Programmatically printing git revision and checking for uncommitted changes

  - by Andrew Grimm

  To ensure that my scientific analysis is reproducible, I'd like to programmatically check if there are any modifications to the code base that aren't checked in, and if not, print out what commit is being used. For example, if there are uncommitted changes, it should output Warning: uncommitted changes made. This output may not be reproducible. Else, produce Current commit: d27ec73cf2f1df89cbccd41494f579e066bad6fe Ideally, it should use "plumbing", not "porcelain".

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• Go - How to read/write to file?

  - by Seth Hoenig

  I've been trying to learn Go / Golang on my own, but I've been stumped on trying read and write to ordinary files. I can get as far as: inFile,_ := os.Open(INFILE,0,0); but actually getting the content of the file doesn't make sense, since the read function takes a []byte as a parameter?? func (file *File) Read(b []byte) (n int, err Error)

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• How do I open an already opened file with a .net StreamReader?

  - by Jon Cage

  I have some .csv files which I'm using as part of a test bench. I can open them and read them without any problems unless I've already got the file open in Excel in which case I get an IOException: System.IO.IOException : The process cannot access the file 'TestData.csv' because it is being used by another process. This is a snippet from the test bench: using (CsvReader csv = new CsvReader(new StreamReader(new FileStream(fullFilePath, FileMode.Open, FileAccess.Read)), false)) { // Process the file } Is this a limitation of StreamReader? I can open the file in other applications (Notepad++ for example) so it can't be an O/S problem. Maybe I need to use some other class? If anyone knows how I can get round this (aside from closing excel!) I'd be very grateful.

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• PHP Read xlsx Excel 2007 file

  - by nk94555

  I am using oleread to read uploaded xls file. But I am not able to read xlsx files saved in excel-2007 format. can someone help me on how to read xlsx file in PHP.

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• Read email from incoming mail server(POP)

  - by nccsbim071

  Hi, I have used an open source code from codeproject to read email from incoming mail server(POP Server). The code can be found at following location: http://www.codeproject.com/KB/IP/Pop3MimeClient.aspx So far it works fine i can read emails. My objective of using this code was to retrieve emails from POP server and process them. My problem is: If i use gmails pop server "pop.gmail.com" and run the appplication. I get only those emails that i have not retrieved since the last time i run the application. but if i use my clients pop server everytime i run the application i get all the emails in the pop server. for example: If i use gmail pop server: pop.gmail.com I have three emails in the pop server. I haven't run the application. I am running the application for the first time. Application reads the email, this time i will get 3 all the three email. I run the application second time, my application will not read any emails this time because i have already read the 3 existing one. This is fine, this is what i want. Now i send email to pop.gmail.com. I run the application again for the third time, this time i will only get the email that has just arrived that is the fourth one. This is good behaviour, this is what i want. But if i use my clients pop server: No matter how many times i run the application, it reads all the emails in the mail box. This will create problem for me, because i am thinking of building a window service that will read emails from pop server and process them. This service will run continuously. I will process emails in the pop serve then sleep for let's say 1 minute and the process the emails again. If the application downloaded from codeproject reads all the emails all the time, my clients mailbox can have like thousands for email in this mail box, so this would not be feasible for me. Is there some settings that is to be made at my client's pop server that will allow my application to retrieve only those emails that i have not read since last time i run the service or any help Please help, thanks,

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• Using read() directly into a C++ std:vector

  - by Joe

  I'm wrapping up user space linux socket functionality in some C++ for an embedded system (yes, this is probably reinventing the wheel again). I want to offer a read and write implementation using a vector. Doing the write is pretty easy, I can just pass &myvec[0] and avoid unnecessary copying. I'd like to do the same and read directly into a vector, rather than reading into a char buffer then copying all that into a newly created vector. Now, I know how much data I want to read, and I can allocate appropriately (vec.reserve). I can also read into &myvec[0], though this is probably a VERY BAD IDEA. Obviously doing this doesn't allow myvec.size to return anything sensible. Is there any way of doing this that 1) Doesn't completely feel yucky from a safety/C++ perspective and 2) Doesn't involve two copies of the data block - once from kernel to user space and once from a C char * style buffer into a C++ vector. Any thoughts collective?

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• how do i read strings from text files?

  - by ratty

  I like to read string from text file the text file consists of information below con = new MySqlConnection("server=localhost;user id=root; password=""; database=workplantype; pooling=false;"); i like to read server name such as"localhost" here and user id such as"root" here,how can i read this.

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• Read/Write versus Create/Read/Update/Delete permissions difference

  - by archmeta

  From a practical standpoint, is there any real-world difference between Read/Write permissions and Create/Read/Update/Delete permissions? It would seem that if a user had the ability to 'create', he should always have the ability to 'update' or 'delete'? If this is correct, then read/write should always be sufficient, and there is no need to store separate Create/Read/Update/Delete permissions? Are there any real-world use cases in which a user should be given permissions to create but not update, or update but not delete, etc...?

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• ReSharper C# Live Template for Read-Only Dependency Property and Routed Event Boilerplate

  - by Bart Read

  Following on from my previous post, where I shared a Live Template for quickly declaring a normal read-write dependency property and its associated property change event boilerplate, here's an unsurprisingly similar template for creating a read-only dependency property.        #region $PROPNAME$ Read-Only Property and Property Change Routed Event        private static readonly DependencyPropertyKey $PROPNAME$PropertyKey =                                             DependencyProperty.RegisterReadOnly(             "$PROPNAME$", typeof ( $PROPTYPE$ ), typeof ( $DECLARING_TYPE$ ),             new PropertyMetadata( $DEF_VALUE$ , On$PROPNAME$Changed ) );       public static readonly DependencyProperty $PROPNAME$Property =                                           $PROPNAME$PropertyKey.DependencyProperty;        public $PROPTYPE$ $PROPNAME$         {             get { return ( $PROPTYPE$ ) GetValue( $PROPNAME$Property ); }             private set { SetValue( $PROPNAME$PropertyKey, value ); }         }       public static readonly RoutedEvent $PROPNAME$ChangedEvent   =                                           EventManager.RegisterRoutedEvent(           "$PROPNAME$Changed",           RoutingStrategy.$ROUTINGSTRATEGY$,           typeof( RoutedPropertyChangedEventHandler< $PROPTYPE$ > ),           typeof( $DECLARING_TYPE$ ) );       public event RoutedPropertyChangedEventHandler< $PROPTYPE$ > $PROPNAME$Changed       {           add { AddHandler( $PROPNAME$ChangedEvent, value ); }           remove { RemoveHandler( $PROPNAME$ChangedEvent, value ); }       }        private static void On$PROPNAME$Changed(           DependencyObject d, DependencyPropertyChangedEventArgs e)         {             var $DECLARING_TYPE_var$ = d as $DECLARING_TYPE$;            var args = new RoutedPropertyChangedEventArgs< $PROPTYPE$ >(               ( $PROPTYPE$ ) e.OldValue,               ( $PROPTYPE$ ) e.NewValue );           args.RoutedEvent    = $DECLARING_TYPE$.$PROPNAME$ChangedEvent;           $DECLARING_TYPE_var$.RaiseEvent( args );$END$        }        #endregion The only real difference here is the addition of the DependencyPropertyKey, which allows your implementation to set the value of the dependency property without exposing the setter code to consumers of your type. You'll probably find that you create read-only dependency properties much less often than read-write properties, but this should still save you some typing when you do need to do so. Technorati Tags: resharper,live template,c#,dependency property,read-only,routed events,property change,boilerplate,wpf

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• Why does my root filesystem keep becoming read-only?

  - by Scott Severance

  I've lately been having an issue with my root filesystem becoming readonly. It happens some amount of time after boot. I don't know exactly when it happens, as I don't usually notice it until something such as suspending the computer or printing fails. It seems to be fairly random. Since most of my system is on that partition, I can't re-mount it without rebooting. After this happens, the system runs a fsck. Sometimes it prompts to fix problems; other times it apparently finds none. To troubleshoot, I've searched through the logs but found nothing relevant. This might be due in part to not knowing when the actual errors took place. The filesystem is apparently good to begin with, as when fsck runs its fixes it doesn't report any errors. I've scanned the disk with SpinRite. A while ago, SpinRite found and recovered from some bad sectors on the hard drive. I ran a level 4 scan (a thorough scan) after this probem appeared, but SpinRite found nothing. The SMART data reports that the disk is OK with 63 bad sectors. The number of bad sectors hasn't changed recently. I realize that the disk isn't in the best of conditions, and I have complete backups in case of catastrophic failure. Yet the lack of errors in the logs, combined with SpinRite's test results and the unchanged SMART data makes me think that this problem has some cause other than disk failure. Other than disk failure, what could cause my symptoms?

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• How to convert binary read/write to non-binary read/write in C++

  - by Phenom

  I have some C++ code from somewhere that reads and writes data in binary format. I want to see what it's reading and writing in the file, so I want to convert it's binary read and write to non-binary read and write. Also, when I convert the binary write to non-binary write, I want it to still be able to read in the information correctly. How can this be done? The write function: int btwrite(short rrn, BTPAGE *page_ptr) { // long lseek(), addr; long addr; addr = (long) rrn * (long) PAGESIZE + HEADERSIZE; lseek(btfd, addr, 0); return (write(btfd, page_ptr, PAGESIZE)); } The read function: int btread(short rrn, BTPAGE *page_ptr) { // long lseek(), addr; long addr; addr = (long)rrn * (long)PAGESIZE + HEADERSIZE; lseek(btfd, addr, 0); return ( read(btfd, page_ptr, PAGESIZE) ); }

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• Additional spaces in String having read text file to String using FileInputStream

  - by David

  Hi, I'm trying to read in a text file to a String variable. The text file has multiple lines. Having printed the String to test the "read-in" code, there is an additional space between every character. As I am using the String to generate character bigrams, the spaces are making the sample text useless. The code is try{ FileInputStream fstream = new FileInputStream(textfile); DataInputStream in = new DataInputStream(fstream); BufferedReader br = new BufferedReader(new InputStreamReader(in)); //Read corpus file line-by-line, concatenating each line to the String "corpus" while ((strLine = br.readLine()) != null) { corpus = (corpus.concat(strLine)); } in.close(); //Close the input stream } catch (Exception e) {//Catch exception if any System.err.println("Error test check: " + e.getMessage()); } I'd be grateful for any advice. Thanks.

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• Can't mark email read with InterIMAP, folder is read-only

  - by Morri

  I'm trying to mark emails read (/SEEN) with InterIMAP, but this doesn't work. I stepped through the code with debugger, and found out that the response from mail server is "IMAP0078 OK Store ignored with read-only mailbox.", which pretty much tells me why it doesn't work. But it looks like there's no way to tell InterIMAP to open the connection as read-write. If I use something like Thunderbird, I can set the messages as read. Does anyone know how I should use InterIMAP to achieve what I'm trying, or how to change the source code so that I'd be able to mark messages as read?

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