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303a780520
I found that the read code might send multiple requests using the same
nfs_pgio_header, but nfs4_proc_read_setup() is only called once. This is
how we ended up occasionally double-freeing the scratch buffer, but also
means we set a NULL pointer but non-zero length to the xdr scratch
buffer. This results in an oops the first time decoding needs to copy
something to scratch, which frequently happens when decoding READ_PLUS
hole segments.
I fix this by moving scratch handling into the pageio read code. I
provide a function to allocate scratch space for decoding read replies,
and free the scratch buffer when the nfs_pgio_header is freed.
Fixes: fbd2a05f29 (NFSv4.2: Rework scratch handling for READ_PLUS)
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
66 lines
2.3 KiB
C
66 lines
2.3 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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#define READ_PLUS_SCRATCH_SIZE (16)
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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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ssize_t nfs42_proc_getxattr(struct inode *inode, const char *name,
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void *buf, size_t buflen);
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int nfs42_proc_setxattr(struct inode *inode, const char *name,
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const void *buf, size_t buflen, int flags);
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ssize_t nfs42_proc_listxattrs(struct inode *inode, void *buf,
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size_t buflen, u64 *cookiep, bool *eofp);
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int nfs42_proc_removexattr(struct inode *inode, const char *name);
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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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