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Subject[PATCH 09/17] AFS: Implement the PGetVolStat pioctl
Date
From: Wang Lei <wang840925@gmail.com>

Implement the PGetVolStat pioctl for AFS. This will get the status information
for the volume in which a specified file is located.

This can be tested with the OpenAFS userspace tools by doing:

fs examine /afs

on a mounted AFS filesystem, which should return something like:

fs: You don't have the required access rights on '/afs'

or:

[root@andromeda ~]# fs examine /afs
File /afs (1.1.32576) contained in volume 1
Volume status for vid = 536870912 named
Current disk quota is 5000
Current blocks used are 2
The partition has 39007484 blocks available out of 39187776

if authenticated.

Signed-off-by: Wang Lei <wang840925@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/afs/pioctl.c | 35 +++++++++++++++++++++++++++++++++++
include/linux/afscall.h | 19 +++++++++++++++++++
include/linux/venus.h | 1 +
3 files changed, 55 insertions(+), 0 deletions(-)


diff --git a/fs/afs/pioctl.c b/fs/afs/pioctl.c
index 3d95a0d..4efd825 100644
--- a/fs/afs/pioctl.c
+++ b/fs/afs/pioctl.c
@@ -66,6 +66,37 @@ long afs_PGetFileCell(struct dentry *dentry, struct vice_ioctl *arg,
}

/*
+ * Get volume status for pathname
+ */
+long afs_PGetVolStat(struct dentry *dentry, struct vice_ioctl *arg,
+ struct key *key)
+{
+ struct afs_volume_status vs;
+ struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode);
+ long ret;
+
+ _enter("");
+
+ if (arg->out_size < sizeof(struct VolumeStatus)) {
+ _leave(" = -EINVAL [%d < %zu]", arg->out_size,
+ sizeof(struct VolumeStatus));
+ return -EINVAL;
+ }
+
+ ret = afs_vnode_get_volume_status(vnode, key, &vs);
+ if (ret < 0) {
+ _leave(" = %ld", ret);
+ return ret;
+ }
+
+ memcpy(arg->out, &vs, sizeof(struct VolumeStatus));
+ arg->out_size = sizeof(struct VolumeStatus);
+
+ _leave(" = 0 [%d]", arg->out_size);
+ return 0;
+}
+
+/*
* The AFS path-based I/O control operation
*/
long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
@@ -95,6 +126,10 @@ long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg)
ret = afs_PGetFileCell(dentry, arg, key);
break;

+ case VIOC_COMMAND(PGetVolStat):
+ ret = afs_PGetVolStat(dentry, arg, key);
+ break;
+
default:
_debug("fallback to pathless: %x", cmd);
ret = afs_pathless_pioctl(cmd, arg);
diff --git a/include/linux/afscall.h b/include/linux/afscall.h
index 0976469..6772712 100644
--- a/include/linux/afscall.h
+++ b/include/linux/afscall.h
@@ -14,7 +14,26 @@
#define AFSCALL_PIOCTL 0x14

/* pioctl commands */
+#define PGetVolStat 4 /* get volume status */
#define PGetFID 22 /* get file ID */
#define PGetFileCell 30 /* get the cell a file inhabits */

+/*
+ * AFS volume status record
+ */
+struct VolumeStatus {
+ int Vid; /* volume ID */
+ int ParentId; /* parent volume ID */
+ char Online; /* 1 if volume currently online and available */
+ char InService; /* 1 if volume currently in service */
+ char Blessed; /* same as in_service */
+ char NeedsSalvage; /* 1 if consistency checking required */
+ int Type; /* volume type (afs_voltype_t) */
+ int MinQuota; /* minimum blocks set aside */
+ int MaxQuota; /* maximum blocks this volume may occupy */
+ int BlocksInUse; /* blocks this volume currently occupies */
+ int PartBlocksAvail;/* space available in volume's partition */
+ int PartMaxBlocks; /* size of volume's partition */
+};
+
#endif /* _LINUX_AFSCALL_H */
diff --git a/include/linux/venus.h b/include/linux/venus.h
index 9cc115c..437e7f3 100644
--- a/include/linux/venus.h
+++ b/include/linux/venus.h
@@ -17,6 +17,7 @@
/*
* pioctl commands (not usable as ioctls)
*/
+#define VIOCGETVOLSTAT _VICEIOCTL(PGetVolStat)
#define VIOCGETFID _VICEIOCTL(PGetFID)
#define VIOC_FILE_CELL_NAME _VICEIOCTL(PGetFileCell)



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