AFS: implement statfs

Implement the statfs() op for AFS.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/afs/afs.h

@@ -16,6 +16,9 @@
 
 #define AFS_MAXCELLNAME	64		/* maximum length of a cell name */
 #define AFS_MAXVOLNAME	64		/* maximum length of a volume name */
+#define AFSNAMEMAX	256		/* maximum length of a filename plus NUL */
+#define AFSPATHMAX	1024		/* maximum length of a pathname plus NUL */
+#define AFSOPAQUEMAX	1024		/* maximum length of an opaque field */
 
 typedef unsigned			afs_volid_t;
 typedef unsigned			afs_vnodeid_t;
@@ -143,4 +146,24 @@ struct afs_volsync {
 	time_t			creation;	/* volume creation time */
 };
 
+/*
+ * AFS volume status record
+ */
+struct afs_volume_status {
+	u32			vid;		/* volume ID */
+	u32			parent_id;	/* parent volume ID */
+	u8			online;		/* true if volume currently online and available */
+	u8			in_service;	/* true if volume currently in service */
+	u8			blessed;	/* same as in_service */
+	u8			needs_salvage;	/* true if consistency checking required */
+	u32			type;		/* volume type (afs_voltype_t) */
+	u32			min_quota;	/* minimum space set aside (blocks) */
+	u32			max_quota;	/* maximum space this volume may occupy (blocks) */
+	u32			blocks_in_use;	/* space this volume currently occupies (blocks) */
+	u32			part_blocks_avail; /* space available in volume's partition */
+	u32			part_max_blocks; /* size of volume's partition */
+};
+
+#define AFS_BLOCK_SIZE	1024
+
 #endif /* AFS_H */

fs/afs/afs_fs.h

@@ -28,7 +28,8 @@ enum AFS_FS_Operations {
 	FSMAKEDIR		= 141,	/* AFS Create a directory */
 	FSREMOVEDIR		= 142,	/* AFS Remove a directory */
 	FSGIVEUPCALLBACKS	= 147,	/* AFS Discard callback promises */
-	FSGETVOLUMEINFO		= 148,	/* AFS Get root volume information */
+	FSGETVOLUMEINFO		= 148,	/* AFS Get information about a volume */
+	FSGETVOLUMESTATUS	= 149,	/* AFS Get volume status information */
 	FSGETROOTVOLUME		= 151,	/* AFS Get root volume name */
 	FSLOOKUP		= 161,	/* AFS lookup file in directory */
 	FSFETCHDATA64		= 65537, /* AFS Fetch file data */

fs/afs/dir.c

@@ -497,7 +497,7 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
 
 	ASSERTCMP(dentry->d_inode, ==, NULL);
 
-	if (dentry->d_name.len > 255) {
+	if (dentry->d_name.len >= AFSNAMEMAX) {
 		_leave(" = -ENAMETOOLONG");
 		return ERR_PTR(-ENAMETOOLONG);
 	}
@@ -736,7 +736,7 @@ static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 	       dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
 
 	ret = -ENAMETOOLONG;
-	if (dentry->d_name.len > 255)
+	if (dentry->d_name.len >= AFSNAMEMAX)
 		goto error;
 
 	key = afs_request_key(dvnode->volume->cell);
@@ -801,7 +801,7 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
 	       dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
 
 	ret = -ENAMETOOLONG;
-	if (dentry->d_name.len > 255)
+	if (dentry->d_name.len >= AFSNAMEMAX)
 		goto error;
 
 	key = afs_request_key(dvnode->volume->cell);
@@ -847,7 +847,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
 	       dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
 
 	ret = -ENAMETOOLONG;
-	if (dentry->d_name.len > 255)
+	if (dentry->d_name.len >= AFSNAMEMAX)
 		goto error;
 
 	key = afs_request_key(dvnode->volume->cell);
@@ -921,7 +921,7 @@ static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
 	       dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
 
 	ret = -ENAMETOOLONG;
-	if (dentry->d_name.len > 255)
+	if (dentry->d_name.len >= AFSNAMEMAX)
 		goto error;
 
 	key = afs_request_key(dvnode->volume->cell);
@@ -990,7 +990,7 @@ static int afs_link(struct dentry *from, struct inode *dir,
 	       dentry->d_name.name);
 
 	ret = -ENAMETOOLONG;
-	if (dentry->d_name.len > 255)
+	if (dentry->d_name.len >= AFSNAMEMAX)
 		goto error;
 
 	key = afs_request_key(dvnode->volume->cell);
@@ -1038,11 +1038,11 @@ static int afs_symlink(struct inode *dir, struct dentry *dentry,
 	       content);
 
 	ret = -ENAMETOOLONG;
-	if (dentry->d_name.len > 255)
+	if (dentry->d_name.len >= AFSNAMEMAX)
 		goto error;
 
 	ret = -EINVAL;
-	if (strlen(content) > 1023)
+	if (strlen(content) >= AFSPATHMAX)
 		goto error;
 
 	key = afs_request_key(dvnode->volume->cell);
@@ -1112,7 +1112,7 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 	       new_dentry->d_name.name);
 
 	ret = -ENAMETOOLONG;
-	if (new_dentry->d_name.len > 255)
+	if (new_dentry->d_name.len >= AFSNAMEMAX)
 		goto error;
 
 	key = afs_request_key(orig_dvnode->volume->cell);