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[PATCH] knfsd: Avoid excess stack usage in svc_tcp_recvfrom

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..  by allocating the array of 'kvec' in 'struct svc_rqst'.

As we plan to increase RPCSVC_MAXPAGES from 8 upto 256, we can no longer
allocate an array of this size on the stack.  So we allocate it in 'struct
svc_rqst'.

However svc_rqst contains (indirectly) an array of the same type and size
(actually several, but they are in a union).  So rather than waste space, we
move those arrays out of the separately allocated union and into svc_rqst to
share with the kvec moved out of svc_tcp_recvfrom (various arrays are used at
different times, so there is no conflict).

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-10-04 02:15:47 -07:00 • committed by Linus Torvalds
parent 4452435948
commit 3cc03b164c
11 changed files with 44 additions and 47 deletions
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2
include/linux/nfsd/xdr.h
View file

@ -30,7 +30,6 @@ struct nfsd_readargs {
struct svc_fh fh;
__u32 offset;
__u32 count;
struct kvec vec[RPCSVC_MAXPAGES];
int vlen;
};
@ -38,7 +37,6 @@ struct nfsd_writeargs {
svc_fh fh;
__u32 offset;
int len;
struct kvec vec[RPCSVC_MAXPAGES];
int vlen;
};

2
include/linux/nfsd/xdr3.h
View file

@ -33,7 +33,6 @@ struct nfsd3_readargs {
struct svc_fh fh;
__u64 offset;
__u32 count;
struct kvec vec[RPCSVC_MAXPAGES];
int vlen;
};
@ -43,7 +42,6 @@ struct nfsd3_writeargs {
__u32 count;
int stable;
__u32 len;
struct kvec vec[RPCSVC_MAXPAGES];
int vlen;
};

2
include/linux/nfsd/xdr4.h
View file

@ -241,7 +241,6 @@ struct nfsd4_read {
stateid_t rd_stateid; /* request */
u64 rd_offset; /* request */
u32 rd_length; /* request */
struct kvec rd_iov[RPCSVC_MAXPAGES];
int rd_vlen;
struct file *rd_filp;
@ -326,7 +325,6 @@ struct nfsd4_write {
u64 wr_offset; /* request */
u32 wr_stable_how; /* request */
u32 wr_buflen; /* request */
struct kvec wr_vec[RPCSVC_MAXPAGES]; /* request */
int wr_vlen;
u32 wr_bytes_written; /* response */