ssize_t (*getxattr) (struct dentry *, const char *, void *, size_t);
ssize_t (*listxattr) (struct dentry *, char *, size_t);
int (*removexattr) (struct dentry *, const char *);
- void (*truncate_range)(struct inode *, loff_t, loff_t);
};
Again, all methods are called without any locks being held, unless
removexattr: called by the VFS to remove an extended attribute from
a file. This method is called by removexattr(2) system call.
- truncate_range: a method provided by the underlying filesystem to truncate a
- range of blocks , i.e. punch a hole somewhere in a file.
-
The Address Space Object
========================
----------------------
This describes how the VFS can manipulate an open file. As of kernel
-2.6.22, the following members are defined:
+3.5, the following members are defined:
struct file_operations {
struct module *owner;
int (*flock) (struct file *, int, struct file_lock *);
ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, size_t, unsigned int);
ssize_t (*splice_read)(struct file *, struct pipe_inode_info *, size_t, unsigned int);
+ int (*setlease)(struct file *, long arg, struct file_lock **);
+ long (*fallocate)(struct file *, int mode, loff_t offset, loff_t len);
};
Again, all methods are called without any locks being held, unless
splice_read: called by the VFS to splice data from file to a pipe. This
method is used by the splice(2) system call
+ setlease: called by the VFS to set or release a file lock lease.
+ setlease has the file_lock_lock held and must not sleep.
+
+ fallocate: called by the VFS to preallocate blocks or punch a hole.
+
Note that the file operations are implemented by the specific
filesystem in which the inode resides. When opening a device node
(character or block special) most filesystems will call special