Messages in this thread Patch in this message | | | From | David Howells <> | Subject | [PATCH 08/17] AFS: Implement the PGetFileCell pioctl | Date | Tue, 16 Jun 2009 21:39:27 +0100 |
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From: Jacob Thebault-Spieker <summatusmentis@gmail.com>
Implement the PGetFileCell pioctl for AFS. This will get the name of the cell to which a file belongs and return to userspace.
This can be tested with the OpenAFS userspace tools by doing:
fs whichcell /afs
on a mounted AFS filesystem, which should return something like:
File /afs lives in cell 'cambridge.redhat.com'
Signed-off-by: Jacob Thebault-Spieker <summatusmentis@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> ---
fs/afs/pioctl.c | 31 +++++++++++++++++++++++++++++++ include/linux/afscall.h | 1 + include/linux/venus.h | 1 + 3 files changed, 33 insertions(+), 0 deletions(-)
diff --git a/fs/afs/pioctl.c b/fs/afs/pioctl.c index 2e4f741..3d95a0d 100644 --- a/fs/afs/pioctl.c +++ b/fs/afs/pioctl.c @@ -11,6 +11,7 @@ #include <linux/afscall.h> #include <linux/pioctl.h> #include <linux/venus.h> +#include <linux/string.h> #include "internal.h" /* @@ -39,6 +40,32 @@ static long afs_PGetFID(struct dentry *dentry, struct vice_ioctl *arg, } /* + * Get the cell that the file belongs to + */ +long afs_PGetFileCell(struct dentry *dentry, struct vice_ioctl *arg, + struct key *key) +{ + struct afs_vnode *vnode; + size_t name_len; + + _enter(""); + + vnode = AFS_FS_I(dentry->d_inode); + name_len = strlen(vnode->volume->vlocation->cell->name); + + if (arg->out_size < name_len + 1) { + _leave(" = -EINVAL [%d < %zu]", arg->out_size, name_len + 1); + return -EINVAL; + } + + memcpy(arg->out, &vnode->volume->vlocation->cell->name, name_len + 1); + arg->out_size = name_len + 1; + + _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) @@ -64,6 +91,10 @@ long afs_pioctl(struct dentry *dentry, int cmd, struct vice_ioctl *arg) ret = afs_PGetFID(dentry, arg, key); break; + case VIOC_COMMAND(PGetFileCell): + ret = afs_PGetFileCell(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 cb006a2..0976469 100644 --- a/include/linux/afscall.h +++ b/include/linux/afscall.h @@ -15,5 +15,6 @@ /* pioctl commands */ #define PGetFID 22 /* get file ID */ +#define PGetFileCell 30 /* get the cell a file inhabits */ #endif /* _LINUX_AFSCALL_H */ diff --git a/include/linux/venus.h b/include/linux/venus.h index ea896e4..9cc115c 100644 --- a/include/linux/venus.h +++ b/include/linux/venus.h @@ -18,5 +18,6 @@ * pioctl commands (not usable as ioctls) */ #define VIOCGETFID _VICEIOCTL(PGetFID) +#define VIOC_FILE_CELL_NAME _VICEIOCTL(PGetFileCell) #endif /* _LINUX_VENUS_H */
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