diff options
Diffstat (limited to 'linux/fs/truncate.c')
| -rw-r--r-- | linux/fs/truncate.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/linux/fs/truncate.c b/linux/fs/truncate.c new file mode 100644 index 0000000..fd82db8 --- /dev/null +++ b/linux/fs/truncate.c @@ -0,0 +1,59 @@ +#include <linux/sched.h> + +#include <sys/stat.h> + +static void free_ind(int dev,int block) +{ + struct buffer_head * bh; + unsigned short * p; + int i; + + if (!block) + return; + if (bh=bread(dev,block)) { + p = (unsigned short *) bh->b_data; + for (i=0;i<512;i++,p++) + if (*p) + free_block(dev,*p); + brelse(bh); + } + free_block(dev,block); +} + +static void free_dind(int dev,int block) +{ + struct buffer_head * bh; + unsigned short * p; + int i; + + if (!block) + return; + if (bh=bread(dev,block)) { + p = (unsigned short *) bh->b_data; + for (i=0;i<512;i++,p++) + if (*p) + free_ind(dev,*p); + brelse(bh); + } + free_block(dev,block); +} + +void truncate(struct m_inode * inode) +{ + int i; + + if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) + return; + for (i=0;i<7;i++) + if (inode->i_zone[i]) { + free_block(inode->i_dev,inode->i_zone[i]); + inode->i_zone[i]=0; + } + free_ind(inode->i_dev,inode->i_zone[7]); + free_dind(inode->i_dev,inode->i_zone[8]); + inode->i_zone[7] = inode->i_zone[8] = 0; + inode->i_size = 0; + inode->i_dirt = 1; + inode->i_mtime = inode->i_ctime = CURRENT_TIME; +} + |