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04a5da690e
Set limits for extended attributes (attribute value size and listxattr buffer size), based on the fs-independent limits (XATTR_*_MAX). Define the maximum XDR sizes for the RFC 8276 XATTR operations. In the case of operations that carry a larger payload (SETXATTR, GETXATTR, LISTXATTR), these exclude that payload, which is added as separate pages, like other operations do. Define, much like for read and write operations, the maximum overhead sizes for get/set/listxattr, and use them to limit the maximum payload size for those operations, in combination with the channel attributes. Signed-off-by: Frank van der Linden <fllinden@amazon.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
56 lines
1.9 KiB
C
56 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2014 Anna Schumaker <Anna.Schumaker@Netapp.com>
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*/
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#ifndef __LINUX_FS_NFS_NFS4_2_H
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#define __LINUX_FS_NFS_NFS4_2_H
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#include <linux/xattr.h>
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/*
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* FIXME: four LAYOUTSTATS calls per compound at most! Do we need to support
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* more? Need to consider not to pre-alloc too much for a compound.
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*/
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#define PNFS_LAYOUTSTATS_MAXDEV (4)
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/* nfs4.2proc.c */
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#ifdef CONFIG_NFS_V4_2
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int nfs42_proc_allocate(struct file *, loff_t, loff_t);
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ssize_t nfs42_proc_copy(struct file *, loff_t, struct file *, loff_t, size_t,
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struct nl4_server *, nfs4_stateid *, bool);
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int nfs42_proc_deallocate(struct file *, loff_t, loff_t);
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loff_t nfs42_proc_llseek(struct file *, loff_t, int);
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int nfs42_proc_layoutstats_generic(struct nfs_server *,
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struct nfs42_layoutstat_data *);
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int nfs42_proc_clone(struct file *, struct file *, loff_t, loff_t, loff_t);
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int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg,
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const struct nfs42_layout_error *errors,
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size_t n);
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int nfs42_proc_copy_notify(struct file *, struct file *,
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struct nfs42_copy_notify_res *);
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static inline bool nfs42_files_from_same_server(struct file *in,
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struct file *out)
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{
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struct nfs_client *c_in = (NFS_SERVER(file_inode(in)))->nfs_client;
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struct nfs_client *c_out = (NFS_SERVER(file_inode(out)))->nfs_client;
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return nfs4_check_serverowner_major_id(c_in->cl_serverowner,
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c_out->cl_serverowner);
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}
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/*
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* Maximum XDR buffer size needed for a listxattr buffer of buflen size.
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*
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* The upper boundary is a buffer with all 1-byte sized attribute names.
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* They would be 7 bytes long in the eventual buffer ("user.x\0"), and
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* 8 bytes long XDR-encoded.
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*
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* Include the trailing eof word as well.
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*/
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static inline u32 nfs42_listxattr_xdrsize(u32 buflen)
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{
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return ((buflen / (XATTR_USER_PREFIX_LEN + 2)) * 8) + 4;
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}
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#endif /* CONFIG_NFS_V4_2 */
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#endif /* __LINUX_FS_NFS_NFS4_2_H */
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