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NFS: Simplify ->decode_dirent() calling sequence 

Clean up.

The pointer returned by ->decode_dirent() is no longer used as a
pointer.  The only call site (xdr_decode() in fs/nfs/dir.c) simply
extracts the errno value encoded in the pointer.  Replace the
returned pointer with a standard integer errno return value.

Also, pass the "server" argument as part of the nfs_entry instead of
as a separate parameter.  It's faster to derive "server" in
nfs_readdir_xdr_to_array() since we already have the directory's inode
handy.  "server" ought to be invariant for a set of entries in the
same directory, right?

The legacy versions of decode_dirent() don't use "server" anyway, so
it's wasted work for them to derive and pass "server" for each entry.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Tested-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever 2010-12-14 14:58:11 +00:00 committed by Trond Myklebust
parent 8111f37360
commit 573c4e1ef5
7 changed files with 61 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
fs/nfs/dir.c
View File

@ -172,7 +172,7 @@ struct nfs_cache_array {
struct nfs_cache_array_entry array[0];
};
typedef __be32 * (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
typedef int (*decode_dirent_t)(struct xdr_stream *, struct nfs_entry *, int);
typedef struct {
struct file *file;
struct page *page;
@ -378,14 +378,14 @@ error:
return error;
}
/* Fill in an entry based on the xdr code stored in desc->page */
static
int xdr_decode(nfs_readdir_descriptor_t *desc, struct nfs_entry *entry, struct xdr_stream *stream)
static int xdr_decode(nfs_readdir_descriptor_t *desc,
struct nfs_entry *entry, struct xdr_stream *xdr)
{
__be32 *p = desc->decode(stream, entry, NFS_SERVER(desc->file->f_path.dentry->d_inode), desc->plus);
if (IS_ERR(p))
return PTR_ERR(p);
int error;
error = desc->decode(xdr, entry, desc->plus);
if (error)
return error;
entry->fattr->time_start = desc->timestamp;
entry->fattr->gencount = desc->gencount;
return 0;
@ -566,6 +566,7 @@ int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page,
entry.eof = 0;
entry.fh = nfs_alloc_fhandle();
entry.fattr = nfs_alloc_fattr();
entry.server = NFS_SERVER(inode);
if (entry.fh == NULL || entry.fattr == NULL)
goto out;

9
fs/nfs/internal.h
View File

@ -187,15 +187,18 @@ extern void nfs_destroy_directcache(void);
/* nfs2xdr.c */
extern int nfs_stat_to_errno(enum nfs_stat);
extern struct rpc_procinfo nfs_procedures[];
extern __be32 *nfs2_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
extern int nfs2_decode_dirent(struct xdr_stream *,
struct nfs_entry *, int);
/* nfs3xdr.c */
extern struct rpc_procinfo nfs3_procedures[];
extern __be32 *nfs3_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
extern int nfs3_decode_dirent(struct xdr_stream *,
struct nfs_entry *, int);
/* nfs4xdr.c */
#ifdef CONFIG_NFS_V4
extern __be32 *nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
extern int nfs4_decode_dirent(struct xdr_stream *,
struct nfs_entry *, int);
#endif
#ifdef CONFIG_NFS_V4_1
extern const u32 nfs41_maxread_overhead;

18
fs/nfs/nfs2xdr.c
View File

@ -936,10 +936,10 @@ static int nfs2_xdr_dec_writeres(struct rpc_rqst *req, __be32 *p,
* the local page cache.
* @xdr: XDR stream where entry resides
* @entry: buffer to fill in with entry data
* @server: nfs_server data for this directory
* @plus: boolean indicating whether this should be a readdirplus entry
*
* Returns the position of the next item in the buffer, or an ERR_PTR.
* Returns zero if successful, otherwise a negative errno value is
* returned.
*
* This function is not invoked during READDIR reply decoding, but
* rather whenever an application invokes the getdents(2) system call
@ -954,8 +954,8 @@ static int nfs2_xdr_dec_writeres(struct rpc_rqst *req, __be32 *p,
* entry *nextentry;
* };
*/
__be32 *nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
struct nfs_server *server, int plus)
int nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
int plus)
{
__be32 *p;
int error;
@ -968,9 +968,9 @@ __be32 *nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
if (unlikely(p == NULL))
goto out_overflow;
if (*p++ == xdr_zero)
return ERR_PTR(-EAGAIN);
return -EAGAIN;
entry->eof = 1;
return ERR_PTR(-EBADCOOKIE);
return -EBADCOOKIE;
}
p = xdr_inline_decode(xdr, 4);
@ -980,7 +980,7 @@ __be32 *nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
error = decode_filename_inline(xdr, &entry->name, &entry->len);
if (unlikely(error))
return ERR_PTR(error);
return error;
/*
* The type (size and byte order) of nfscookie isn't defined in
@ -999,11 +999,11 @@ __be32 *nfs2_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
entry->eof = 0;
if (p != NULL)
entry->eof = (p[0] == xdr_zero) && (p[1] != xdr_zero);
return p;
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return ERR_PTR(-EAGAIN);
return -EAGAIN;
}
/*

28
fs/nfs/nfs3xdr.c
View File

@ -1970,10 +1970,10 @@ out_status:
* the local page cache
* @xdr: XDR stream where entry resides
* @entry: buffer to fill in with entry data
* @server: nfs_server data for this directory
* @plus: boolean indicating whether this should be a readdirplus entry
*
* Returns the position of the next item in the buffer, or an ERR_PTR.
* Returns zero if successful, otherwise a negative errno value is
* returned.
*
* This function is not invoked during READDIR reply decoding, but
* rather whenever an application invokes the getdents(2) system call
@ -2000,8 +2000,8 @@ out_status:
* entryplus3 *nextentry;
* };
*/
__be32 *nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
struct nfs_server *server, int plus)
int nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
int plus)
{
struct nfs_entry old = *entry;
__be32 *p;
@ -2015,23 +2015,23 @@ __be32 *nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
if (unlikely(p == NULL))
goto out_overflow;
if (*p == xdr_zero)
return ERR_PTR(-EAGAIN);
return -EAGAIN;
entry->eof = 1;
return ERR_PTR(-EBADCOOKIE);
return -EBADCOOKIE;
}
error = decode_fileid3(xdr, &entry->ino);
if (unlikely(error))
return ERR_PTR(error);
return error;
error = decode_inline_filename3(xdr, &entry->name, &entry->len);
if (unlikely(error))
return ERR_PTR(error);
return error;
entry->prev_cookie = entry->cookie;
error = decode_cookie3(xdr, &entry->cookie);
if (unlikely(error))
return ERR_PTR(error);
return error;
entry->d_type = DT_UNKNOWN;
@ -2039,7 +2039,7 @@ __be32 *nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
entry->fattr->valid = 0;
error = decode_post_op_attr(xdr, entry->fattr);
if (unlikely(error))
return ERR_PTR(error);
return error;
if (entry->fattr->valid & NFS_ATTR_FATTR_V3)
entry->d_type = nfs_umode_to_dtype(entry->fattr->mode);
@ -2052,7 +2052,7 @@ __be32 *nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
if (unlikely(error)) {
if (error == -E2BIG)
goto out_truncated;
return ERR_PTR(error);
return error;
}
} else
zero_nfs_fh3(entry->fh);
@ -2063,15 +2063,15 @@ __be32 *nfs3_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
entry->eof = 0;
if (p != NULL)
entry->eof = (p[0] == xdr_zero) && (p[1] != xdr_zero);
return p;
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return ERR_PTR(-EAGAIN);
return -EAGAIN;
out_truncated:
dprintk("NFS: directory entry contains invalid file handle\n");
*entry = old;
return ERR_PTR(-EAGAIN);
return -EAGAIN;
}
/*

1
fs/nfs/nfs4_fs.h
View File

@ -331,7 +331,6 @@ extern void nfs_free_seqid(struct nfs_seqid *seqid);
extern const nfs4_stateid zero_stateid;
/* nfs4xdr.c */
extern __be32 *nfs4_decode_dirent(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int);
extern struct rpc_procinfo nfs4_procedures[];
struct nfs4_mount_data;

29
fs/nfs/nfs4xdr.c
View File

@ -6159,8 +6159,22 @@ out:
}
#endif /* CONFIG_NFS_V4_1 */
__be32 *nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
struct nfs_server *server, int plus)
/**
* nfs4_decode_dirent - Decode a single NFSv4 directory entry stored in
* the local page cache.
* @xdr: XDR stream where entry resides
* @entry: buffer to fill in with entry data
* @plus: boolean indicating whether this should be a readdirplus entry
*
* Returns zero if successful, otherwise a negative errno value is
* returned.
*
* This function is not invoked during READDIR reply decoding, but
* rather whenever an application invokes the getdents(2) system call
* on a directory already in our cache.
*/
int nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
int plus)
{
uint32_t bitmap[2] = {0};
uint32_t len;
@ -6172,9 +6186,9 @@ __be32 *nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
if (unlikely(!p))
goto out_overflow;
if (!ntohl(*p++))
return ERR_PTR(-EAGAIN);
return -EAGAIN;
entry->eof = 1;
return ERR_PTR(-EBADCOOKIE);
return -EBADCOOKIE;
}
p = xdr_inline_decode(xdr, 12);
@ -6203,7 +6217,8 @@ __be32 *nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
if (decode_attr_length(xdr, &len, &p) < 0)
goto out_overflow;
if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh, server, 1) < 0)
if (decode_getfattr_attrs(xdr, bitmap, entry->fattr, entry->fh,
entry->server, 1) < 0)
goto out_overflow;
if (entry->fattr->valid & NFS_ATTR_FATTR_FILEID)
entry->ino = entry->fattr->fileid;
@ -6221,11 +6236,11 @@ __be32 *nfs4_decode_dirent(struct xdr_stream *xdr, struct nfs_entry *entry,
else
entry->eof = 0;
return p;
return 0;
out_overflow:
print_overflow_msg(__func__, xdr);
return ERR_PTR(-EAGAIN);
return -EAGAIN;
}
/*

3
include/linux/nfs_xdr.h
View File

@ -484,6 +484,7 @@ struct nfs_entry {
struct nfs_fh * fh;
struct nfs_fattr * fattr;
unsigned char d_type;
struct nfs_server * server;
};
/*
@ -1089,7 +1090,7 @@ struct nfs_rpc_ops {
int (*pathconf) (struct nfs_server *, struct nfs_fh *,
struct nfs_pathconf *);
int (*set_capabilities)(struct nfs_server *, struct nfs_fh *);
__be32 *(*decode_dirent)(struct xdr_stream *, struct nfs_entry *, struct nfs_server *, int plus);
int (*decode_dirent)(struct xdr_stream *, struct nfs_entry *, int);
void (*read_setup) (struct nfs_read_data *, struct rpc_message *);
int (*read_done) (struct rpc_task *, struct nfs_read_data *);
void (*write_setup) (struct nfs_write_data *, struct rpc_message *);