Failed to read NTFS $Bitmap: Input/output error

• ERROR:

  Error mounting /dev/sdb2 at /run/media/user/Study: Command-line `mount -t "ntfs" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,dmask=0077,fmask=0177" "/dev/sdb2" "/run/media/user/Study"' exited with non-zero exit status 13: ntfs_attr_pread_i: ntfs_pread failed: Input/output error
  Failed to read NTFS $Bitmap: Input/output error
  NTFS is either inconsistent, or there is a hardware fault, or it's a
  SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows
  then reboot into Windows twice. The usage of the /f parameter is very
  important! If the device is a SoftRAID/FakeRAID then first activate
  it and mount a different device under the /dev/mapper/ directory, (e.g.
  /dev/mapper/nvidia_eahaabcc1). Please see the 'dmraid' documentation
  for more details.

• REASON:
  
  This is due to fragmentation problem of the NTFS partition
  
• SOLUTION:
  • Windows - Run command prompt in Administrative mode
    run following command:
    
    

    chkdsk /r f:

    (help - command manual )
    
    (if partition is "F")
  • Linux (fedora/ubuntu) - install "ntfsprogs" package
    Run following command:
    

    $ ntfsck /dev/sda1    #If your partition is /dev/sda11

  
  
  
  
  
  

  
  

   

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samba share - ctags: Warning: cannot open source file "directory" : Value too large for defined data type

1. Reason: Samba share mounted from windows in linux (fedora) may be read-only check in windows by going to properties of folder.
2. Solution: if its marked as read-only, un-check box.
3. fstab: add following lines at end of your /etc/fstab file

 //server/share_name    /path/to/mount/point  cifs rw,uid=1000,gid=1000,credentials=/home/user_home/smbcredential_file,dir_mode=0755,file_mode=0755  0  0  

1. details: add your credentials to smbcredentials_file:

 username=server_username  
 password=server_password   

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openGL : Fedora 17 : undefined reference to symbol 'cos@@GLIBC_2.0'

1. ERROR:
   
   gcc wave.o -o wave -I/usr/include -L/usr/lib -lglut -lGL -lGLU -lX11 -m32
   /usr/bin/ld: wave.o: undefined reference to symbol 'cos@@GLIBC_2.0'
   /usr/bin/ld: note: 'cos@@GLIBC_2.0' is defined in DSO /lib/libm.so.6 so try adding it to the linker command line
   /lib/libm.so.6: could not read symbols: Invalid operation
   collect2: error: ld returned 1 exit status
2. Solution:
   Add '-lm' flag while compiling.
   
   gcc wave.o -o wave -I/usr/include -L/usr/lib -lglut -lGL -lm  -lGLU -lX11 -m32

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Sharing using SAMBA on fedora 17

1. Install SAMBA in fedora 17:
• $ sudo yum install system-config-samba samba-client samba-common samba system-config-samba system-config-users
2. Set SElinux permissions:
• $ sudo yum install policycoreutils-gui
• in gnome go to Administration > SELinux Management and check (set) the following booleans
• Allow qemu to share any file/directory read/write
• Allow samba to share users home diectory 
• Allow samba to export ntfs/fusersfs volumes
3. Configure Firewall :
• check the samba box in System > Administration > Firewall
4. Configure SAMBA:
1. Adding users:
•  Go to System > Administration > Samba > Preferences > Samba Users > Add User
•  Then to edit the Samba share that was created earlier, click on the share then > File > Properties > Access > Give access to users or choose to give access to everybody.
2. Sharing user's HOME directory:Here is configuration file /etc/samba/smb.conf
   (NOTE: make changes in above file look as bellow and do not change other options, leave other settings as it is)
   
   ########## PART of smb.conf file #############
   

   #=======Global Settings=======
   [global] 
   workgroup = WORKGROUP
   server string = YOURSERVER
   netbios name = YOURSERVER
   interfaces = eth0 192.168.92.3/24
   # ----------------------- Standalone Server Options -------------------
   security = user
   #------------------------ Name Resolution -------------------------------
   wins support = yes
   #========= Share Definitions ===========
   [homes]
       comment = Home Directories
   ;   browseable = yes
       writable = yes
       valid users = %S
   
   [your_share]
       path = /path/to/your_share
       read only = no
       browseable = no
       valid users = username

   #######################################
    

    5.  Accessing share:

• Access users HOME sharing:
  
  In windows go to Run> \\YOURSERVER\samba_username
  
  Enter your username and password of samba user.
• Auto mount as Network drive:
  Right-click on computer>Map network drive
  
  choose Drive from drop down (e.g. L:)
  
  At Folder enter \\YOURSERVER\samba_username to access home directory share or enter \\YOURSERVER\your_share to access shared directory.

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Installing openGL on Fedora 17

Steps to install openGL on fedora 17:
Installing:

 $sudo yum install freeglut-devel build-essential  

Compiling sample program:

1. Get sample programs from SAMPLE  PROGRAMMS
2. Makefile:

 LDFLAGS=-lglut -lGL -lGLU -lX11 -lm  
 INCLUDES=-I/usr/include  
 LIBS=-I/usr/lib  
 CC=gcc  
 SOURCES=wave.c teapot.c logo.c  
 TARGETS=$(SOURCES:.c= )  
 DEPS=  
 OBJS=$(SOURCES:.c=.o)  
 %.o: %.c $(DEPS)   
  $(CC) -c -o $@ $< $(INCLUDES) $(LIBS) $(LDFLAGS)  
 wave: $(OBJS)  
  $(CC) $@.o -o $@ $(INCLUDES) $(LIBS) $(LDFLAGS)  
 teapot: $(OBJS)  
  $(CC) $@.o -o $@ $(INCLUDES) $(LIBS) $(LDFLAGS)  
 logo: $(OBJS)  
  $(CC) $@.o -o $@ $(INCLUDES) $(LIBS) $(LDFLAGS)  
 .PHONY: clean  
 clean:  
  rm -f $(OBJS) $(TARGETS)  

E.g. Compiling  wave.c

 $make wave  

Running program:
E.g. To run wave.c program

 $./wave  

             

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Grep excluding .svn directories

1. Temporary/one-time  solution:

grep -Rin "what r u looking for" *|grep -v "\.svn/*"

     2. Permanent solution (for Ubuntu/Linux) - add following line to ~/.bashrc

export GREP_OPTIONS="--exclude=*\.svn*"

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Linux Kernel Cross-compilation for ARM based systems

Here is the link for small presentation regarding cross-compilation of Linux kernel for arm based systems. Presentation also includes guide for how to edit existing Linux drivers to adapt to your application.


link : Linux Kernel Compilation-ARM

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Download Youtube Videos on Linux (Behind Proxy)

• Install youtube-dl
• Ubuntu: sudo apt-get install youtube-dl
• Fedora: sudo yum -y install youtube-dl

•  Open terminal and export http_proxy
• export http_proxy=http://username:passwd@proxy.com:port_num/

              ( escape spacial characters in password by '\')

• Download videos
• youtube-dl  --all-formats url-of-video

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