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fuse: invalidation reverse calls

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Add notification messages that allow the filesystem to invalidate VFS
caches.

Two notifications are added:

 1) inode invalidation

   - invalidate cached attributes
   - invalidate a range of pages in the page cache (this is optional)

 2) dentry invalidation

   - try to invalidate a subtree in the dentry cache

Care must be taken while accessing the 'struct super_block' for the
mount, as it can go away while an invalidation is in progress.  To
prevent this, introduce a rw-semaphore, that is taken for read during
the invalidation and taken for write in the ->kill_sb callback.

Cc: Csaba Henk <csaba@gluster.com>
Cc: Anand Avati <avati@zresearch.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
John Muir
2009-05-31 11:13:57 -04:00
committed by Miklos Szeredi
parent e0a43ddcc0
commit 3b463ae0c6
5 changed files with 214 additions and 3 deletions
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24
fs/fuse/fuse_i.h
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@@ -484,6 +484,12 @@ struct fuse_conn {
/** Called on final put */
void (*release)(struct fuse_conn *);
/** Super block for this connection. */
struct super_block *sb;
/** Read/write semaphore to hold when accessing sb. */
struct rw_semaphore killsb;
};
static inline struct fuse_conn *get_fuse_conn_super(struct super_block *sb)
@@ -511,6 +517,11 @@ extern const struct file_operations fuse_dev_operations;
extern const struct dentry_operations fuse_dentry_operations;
/**
* Inode to nodeid comparison.
*/
int fuse_inode_eq(struct inode *inode, void *_nodeidp);
/**
* Get a filled in inode
*/
@@ -711,6 +722,19 @@ void fuse_release_nowrite(struct inode *inode);
u64 fuse_get_attr_version(struct fuse_conn *fc);
/**
* File-system tells the kernel to invalidate cache for the given node id.
*/
int fuse_reverse_inval_inode(struct super_block *sb, u64 nodeid,
loff_t offset, loff_t len);
/**
* File-system tells the kernel to invalidate parent attributes and
* the dentry matching parent/name.
*/
int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
struct qstr *name);
int fuse_do_open(struct fuse_conn *fc, u64 nodeid, struct file *file,
bool isdir);
ssize_t fuse_direct_io(struct file *file, const char __user *buf,