diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/read_write.c | 44 |
1 files changed, 41 insertions, 3 deletions
diff --git a/fs/read_write.c b/fs/read_write.c index 5520f8ad5504..5907b49e4d7e 100644 --- a/fs/read_write.c +++ b/fs/read_write.c @@ -64,6 +64,23 @@ generic_file_llseek_unlocked(struct file *file, loff_t offset, int origin) return file->f_pos; offset += file->f_pos; break; + case SEEK_DATA: + /* + * In the generic case the entire file is data, so as long as + * offset isn't at the end of the file then the offset is data. + */ + if (offset >= inode->i_size) + return -ENXIO; + break; + case SEEK_HOLE: + /* + * There is a virtual hole at the end of the file, so as long as + * offset isn't i_size or larger, return i_size. + */ + if (offset >= inode->i_size) + return -ENXIO; + offset = inode->i_size; + break; } if (offset < 0 && !unsigned_offsets(file)) @@ -128,12 +145,13 @@ EXPORT_SYMBOL(no_llseek); loff_t default_llseek(struct file *file, loff_t offset, int origin) { + struct inode *inode = file->f_path.dentry->d_inode; loff_t retval; - mutex_lock(&file->f_dentry->d_inode->i_mutex); + mutex_lock(&inode->i_mutex); switch (origin) { case SEEK_END: - offset += i_size_read(file->f_path.dentry->d_inode); + offset += i_size_read(inode); break; case SEEK_CUR: if (offset == 0) { @@ -141,6 +159,26 @@ loff_t default_llseek(struct file *file, loff_t offset, int origin) goto out; } offset += file->f_pos; + break; + case SEEK_DATA: + /* + * In the generic case the entire file is data, so as + * long as offset isn't at the end of the file then the + * offset is data. + */ + if (offset >= inode->i_size) + return -ENXIO; + break; + case SEEK_HOLE: + /* + * There is a virtual hole at the end of the file, so + * as long as offset isn't i_size or larger, return + * i_size. + */ + if (offset >= inode->i_size) + return -ENXIO; + offset = inode->i_size; + break; } retval = -EINVAL; if (offset >= 0 || unsigned_offsets(file)) { @@ -151,7 +189,7 @@ loff_t default_llseek(struct file *file, loff_t offset, int origin) retval = offset; } out: - mutex_unlock(&file->f_dentry->d_inode->i_mutex); + mutex_unlock(&inode->i_mutex); return retval; } EXPORT_SYMBOL(default_llseek); |