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pnfs: layoutret_on_setattr

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With the objects layout security model, we have object capabilities
that are associated with the layout and we anticipate that the server
will issue a cb_layoutrecall for any setattr that changes security
related attributes (user/group/mode/acl) or truncates the file.

Therefore, the layout is returned before issuing the setattr to avoid
the anticipated cb_layoutrecall.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
This commit is contained in:
Benny Halevy 2010-07-14 15:43:57 -04:00 committed by Boaz Harrosh
parent cbe8260369
commit 8a1636c459
3 changed files with 26 additions and 0 deletions
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3
fs/nfs/nfs4proc.c
View File

@ -2361,6 +2361,9 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
struct nfs4_state *state = NULL;
int status;
if (pnfs_ld_layoutret_on_setattr(inode))
pnfs_return_layout(inode);
nfs_fattr_init(fattr);
/* Search for an existing open(O_WRITE) file */

1
fs/nfs/objlayout/objio_osd.c
View File

@ -964,6 +964,7 @@ objlayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
static struct pnfs_layoutdriver_type objlayout_type = {
.id = LAYOUT_OSD2_OBJECTS,
.name = "LAYOUT_OSD2_OBJECTS",
.flags = PNFS_LAYOUTRET_ON_SETATTR,
.alloc_layout_hdr = objlayout_alloc_layout_hdr,
.free_layout_hdr = objlayout_free_layout_hdr,

22
fs/nfs/pnfs.h
View File

@ -65,6 +65,11 @@ enum {
NFS_LAYOUT_DESTROYED, /* no new use of layout allowed */
};
enum layoutdriver_policy_flags {
/* Should the pNFS client commit and return the layout upon a setattr */
PNFS_LAYOUTRET_ON_SETATTR = 1 << 0,
};
struct nfs4_deviceid_node;
/* Per-layout driver specific registration structure */
@ -73,6 +78,7 @@ struct pnfs_layoutdriver_type {
const u32 id;
const char *name;
struct module *owner;
unsigned flags;
struct pnfs_layout_hdr * (*alloc_layout_hdr) (struct inode *inode, gfp_t gfp_flags);
void (*free_layout_hdr) (struct pnfs_layout_hdr *);
@ -258,6 +264,16 @@ static inline void pnfs_clear_request_commit(struct nfs_page *req)
put_lseg(req->wb_commit_lseg);
}
/* Should the pNFS client commit and return the layout upon a setattr */
static inline bool
pnfs_ld_layoutret_on_setattr(struct inode *inode)
{
if (!pnfs_enabled_sb(NFS_SERVER(inode)))
return false;
return NFS_SERVER(inode)->pnfs_curr_ld->flags &
PNFS_LAYOUTRET_ON_SETATTR;
}
static inline int pnfs_return_layout(struct inode *ino)
{
struct nfs_inode *nfsi = NFS_I(ino);
@ -316,6 +332,12 @@ static inline int pnfs_return_layout(struct inode *ino)
return 0;
}
static inline bool
pnfs_ld_layoutret_on_setattr(struct inode *inode)
{
return false;
}
static inline bool
pnfs_roc(struct inode *ino)
{