fsync.c 1.4 KB

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  1. /*
  2. * linux/fs/ext2/fsync.c
  3. *
  4. * Copyright (C) 1993 Stephen Tweedie (sct@dcs.ed.ac.uk)
  5. * from
  6. * Copyright (C) 1992 Remy Card (card@masi.ibp.fr)
  7. * Laboratoire MASI - Institut Blaise Pascal
  8. * Universite Pierre et Marie Curie (Paris VI)
  9. * from
  10. * linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds
  11. *
  12. * ext2fs fsync primitive
  13. *
  14. * Big-endian to little-endian byte-swapping/bitmaps by
  15. * David S. Miller (davem@caip.rutgers.edu), 1995
  16. *
  17. * Removed unnecessary code duplication for little endian machines
  18. * and excessive __inline__s.
  19. * Andi Kleen, 1997
  20. *
  21. * Major simplications and cleanup - we only need to do the metadata, because
  22. * we can depend on generic_block_fdatasync() to sync the data blocks.
  23. */
  24. #include "ext2.h"
  25. #include <linux/smp_lock.h>
  26. #include <linux/buffer_head.h> /* for sync_mapping_buffers() */
  27. /*
  28. * File may be NULL when we are called. Perhaps we shouldn't
  29. * even pass file to fsync ?
  30. */
  31. int ext2_sync_file(struct file *file, struct dentry *dentry, int datasync)
  32. {
  33. struct inode *inode = dentry->d_inode;
  34. int err;
  35. int ret;
  36. ret = sync_mapping_buffers(inode->i_mapping);
  37. if (!(inode->i_state & I_DIRTY))
  38. return ret;
  39. if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
  40. return ret;
  41. err = ext2_sync_inode(inode);
  42. if (ret == 0)
  43. ret = err;
  44. return ret;
  45. }