Veritas™ File System Programmer's Reference Guide - Solaris

Last Published:
Product(s): InfoScale & Storage Foundation (7.2)
Platform: Solaris
  1. Veritas File System software developer's kit
    1.  
      About the software developer's kit
    2. File System software developer's kit features
      1.  
        API library interfaces
      2.  
        File Change Log
      3.  
        Multi-volume support
      4.  
        Veritas File System I/O
    3.  
      Software developer's kit packages
    4.  
      Required libraries and header files
    5. Compiling environment
      1.  
        Recompiling with a different compiler
  2. File Change Log
    1. About the File Change Log file
      1.  
        Recorded changes
      2. Using the File Change Log file
        1.  
          Space usage
        2.  
          Full system scan reductions
        3.  
          File history traces
      3.  
        File Change Log logging activation
      4. File Change Log file layout
        1.  
          File Change Log superblock
        2.  
          File Change Log record
    2. Record types
      1.  
        Special records
      2.  
        Typical record sequences
    3. File Change Log tunables
      1.  
        How tunables handle File Change Log growth size
    4. Application programming interface for File Change Log
      1.  
        Ease of use
      2.  
        Backward compatibility
      3. API functions
        1.  
          Functions for accessing File Change Log records
        2.  
          Functions for seeking offsets and time stamps in the File Change Log
        3. vxfs_fcl_open
          1.  
            Return value
        4. vxfs_fcl_close
          1.  
            Parameters
        5. vxfs_fcl_getinfo
          1.  
            Return values
        6. vxfs_fcl_read
          1.  
            Parameters
          2.  
            Input
          3.  
            Output
          4.  
            Return values
        7. vxfs_fcl_getcookie
          1.  
            Parameters
        8. vxfs_fcl_seek
          1.  
            Parameters
          2.  
            Return values
        9. vxfs_fcl_seektime
          1.  
            Parameters
          2.  
            Return values
        10. vxfs_fcl_sync
          1.  
            Parameters
      4. File Change Log record
        1.  
          Defines
        2.  
          fcl_iostats structure
        3.  
          fcl_acsinfo structure
        4.  
          Record structure fields
      5. Copying File Change Log records
        1.  
          Index maintenance application
        2. Computing a usage profile
          1.  
            Initial setup
          2.  
            Sample steps
          3.  
            Off host processing
      6. Veritas File System and File Change Log upgrade and downgrade
        1.  
          Converting File Change Log version 3 files to version 4
        2.  
          Downgrading Veritas File System versions
    5. Reverse path name lookup
      1.  
        Inodes
      2.  
        vxfs_inotopath_gen
  3. Multi-volume support
    1.  
      About multi-volume support
    2.  
      Uses for multi-volume support
    3. Volume application programming interfaces
      1.  
        Administering volume sets
      2.  
        Querying the volume set for a file system
      3.  
        Modifying a volume within a file system
      4.  
        Encapsulationg and de-encapsulating a volume
    4. Allocation policy application programming interfaces
      1.  
        Directing file allocations
      2.  
        Creating and assigning policies
      3.  
        Querying the defined policies
      4.  
        Enforcing a policy
    5.  
      Data structures
    6. Using policies and application programming interfaces
      1.  
        Defining and assigning allocation policies
      2.  
        Using volume application programming interfaces
  4. Named data streams
    1.  
      About named data streams
    2.  
      Uses for named data streams
    3.  
      Named data streams application programming interface
    4.  
      Listing named data streams
    5.  
      Namespace for named data streams
    6.  
      Behavior changes in other system calls
    7.  
      Querying named data streams
    8.  
      Application programming interface
    9.  
      Command reference
  5. Veritas File System I/O
    1.  
      About Veritas File System I/O
    2.  
      Freeze and thaw
    3. Caching advisories
      1.  
        Direct I/O
      2.  
        Concurrent I/O
      3.  
        Unbuffered I/O
      4.  
        Other advisories
    4. Extents
      1. Extent attributes
        1.  
          Attribute specifics
      2.  
        Reservation: preallocating space to a file
      3.  
        Fixed extent size
      4.  
        Application programming interface for extent attributes
      5. Allocation flags
        1.  
          Allocation flags with reservation
        2.  
          Reservation trimming
        3.  
          Non-persistent reservation
        4.  
          No write beyond reservation
        5.  
          Contiguous reservation
        6.  
          Include reservation in the file size
        7.  
          Reading the grown part of the file
      6.  
        Allocation flags with fixed extent size
      7.  
        How to use extent attribute APIs
      8.  
        Setting fixed extent size
  6. Thin Reclamation
    1.  
      About Thin Storage
    2.  
      About Thin Reclamation
    3. Thin Reclamation application programming interface
      1.  
        vxfs_ts_reclaim return values

How to use extent attribute APIs

First, verify that the target file system is VxFS, and then determine the file system block size using the statfs() call. The type for VxFS is MNT_VXFS on most platforms, and the file system block size is returned in statfs.f_bsize. The block size must be known for setting or interpreting the extent attribute information through VxFS extent attribute APIs.

Each invocation of the VX_SETEXT ioctl affects all the elements in the vx_ext structure.

To use VX_SETEXT

  1. Call the VX_GETEXT ioctl to read the current settings, if any.
  2. Modify the current values to be changed.
  3. Call the VX_SETEXT ioctl to set the new values.

Warning:

Follow this procedure carefully. A fixed extent size may be inadvertently cleared when the reservation is changed. When copying files between VxFS and non-VxFS file systems, the extent attributes cannot be preserved. The attribute values returned for a file in a vx_ext structure have a different effect on another VxFS file system with a different file system block size from the source file system. Translation of attribute values for different block sizes may be necessary when copying files with attributes between two file systems of a different block size.