file.c

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    1 /*
    2  *  linux/fs/hpfs/file.c
    3  *
    4  *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
    5  *
    6  *  file VFS functions
    7  */
    8 
    9 #include <linux/string.h>
   10 #include <linux/sched.h>
   11 #include <linux/smp_lock.h>
   12 #include "hpfs_fn.h"
   13 
   14 #define BLOCKS(size) (((size) + 511) >> 9)
   15 
   16 /* HUH? */
   17 int hpfs_open(struct inode *i, struct file *f)
   18 {
   19         lock_kernel();
   20         hpfs_lock_inode(i);
   21         hpfs_unlock_inode(i); /* make sure nobody is deleting the file */
   22         unlock_kernel();
   23         if (!i->i_nlink) return -ENOENT;
   24         return 0;
   25 }
   26 
   27 int hpfs_file_release(struct inode *inode, struct file *file)
   28 {
   29         lock_kernel();
   30         hpfs_write_if_changed(inode);
   31         unlock_kernel();
   32         return 0;
   33 }
   34 
   35 int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
   36 {
   37         /*return file_fsync(file, dentry);*/
   38         return 0; /* Don't fsync :-) */
   39 }
   40 
   41 /*
   42  * generic_file_read often calls bmap with non-existing sector,
   43  * so we must ignore such errors.
   44  */
   45 
   46 secno hpfs_bmap(struct inode *inode, unsigned file_secno)
   47 {
   48         unsigned n, disk_secno;
   49         struct fnode *fnode;
   50         struct buffer_head *bh;
   51         if (BLOCKS(inode->u.hpfs_i.mmu_private) <= file_secno) return 0;
   52         n = file_secno - inode->i_hpfs_file_sec;
   53         if (n < inode->i_hpfs_n_secs) return inode->i_hpfs_disk_sec + n;
   54         if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
   55         disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
   56         if (disk_secno == -1) return 0;
   57         if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
   58         return disk_secno;
   59 }
   60 
   61 void hpfs_truncate(struct inode *i)
   62 {
   63         if (IS_IMMUTABLE(i)) return /*-EPERM*/;
   64         i->i_hpfs_n_secs = 0;
   65         i->i_blocks = 1 + ((i->i_size + 511) >> 9);
   66         i->u.hpfs_i.mmu_private = i->i_size;
   67         hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
   68         hpfs_write_inode(i);
   69 }
   70 
   71 int hpfs_get_block(struct inode *inode, long iblock, struct buffer_head *bh_result, int create)
   72 {
   73         secno s;
   74         s = hpfs_bmap(inode, iblock);
   75         if (s) {
   76                 bh_result->b_dev = inode->i_dev;
   77                 bh_result->b_blocknr = s;
   78                 bh_result->b_state |= (1UL << BH_Mapped);
   79                 return 0;
   80         }
   81         if (!create) return 0;
   82         if (iblock<<9 != inode->u.hpfs_i.mmu_private) {
   83                 BUG();
   84                 return -EIO;
   85         }
   86         if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
   87                 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
   88                 return -ENOSPC;
   89         }
   90         inode->i_blocks++;
   91         inode->u.hpfs_i.mmu_private += 512;
   92         bh_result->b_dev = inode->i_dev;
   93         bh_result->b_blocknr = s;
   94         bh_result->b_state |= (1UL << BH_Mapped) | (1UL << BH_New);
   95         return 0;
   96 }
   97 
   98 static int hpfs_writepage(struct page *page)
   99 {
  100         return block_write_full_page(page,hpfs_get_block);
  101 }
  102 static int hpfs_readpage(struct file *file, struct page *page)
  103 {
  104         return block_read_full_page(page,hpfs_get_block);
  105 }
  106 static int hpfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
  107 {
  108         return cont_prepare_write(page,from,to,hpfs_get_block,
  109                 &page->mapping->host->u.hpfs_i.mmu_private);
  110 }
  111 static int _hpfs_bmap(struct address_space *mapping, long block)
  112 {
  113         return generic_block_bmap(mapping,block,hpfs_get_block);
  114 }
  115 struct address_space_operations hpfs_aops = {
  116         readpage: hpfs_readpage,
  117         writepage: hpfs_writepage,
  118         sync_page: block_sync_page,
  119         prepare_write: hpfs_prepare_write,
  120         commit_write: generic_commit_write,
  121         bmap: _hpfs_bmap
  122 };
  123 
  124 ssize_t hpfs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
  125 {
  126         ssize_t retval;
  127 
  128         retval = generic_file_write(file, buf, count, ppos);
  129         if (retval > 0) {
  130                 struct inode *inode = file->f_dentry->d_inode;
  131                 inode->i_mtime = CURRENT_TIME;
  132                 inode->i_hpfs_dirty = 1;
  133         }
  134         return retval;
  135 }
  136

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FreeBSD/Linux Kernel Cross Reference sys/fs/hpfs/file.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/file.c