nfs: make nfs4_init_nonuniform_client_string use a dynamically allocated buffer

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The way the *_client_string functions work is a little goofy. They build
the string in an on-stack buffer and then use kstrdup to copy it. This
is not only stack-heavy but artificially limits the size of the client
name string. Change it so that we determine the length of the string,
allocate it and then scnprintf into it.

Since the contents of the nonuniform string depend on rcu-managed data
structures, it's possible that they'll change between when we allocate
the string and when we go to fill it. If that happens, free the string,
recalculate the length and try again. If it the mismatch isn't resolved
on the second try then just give up and return -EINVAL.

Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

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Jeff Layton 2015-06-09 19:43:59 -04:00 • committed by Trond Myklebust

parent b8fb2f595e

commit a319268891

1 changed files with 51 additions and 23 deletions

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fs/nfs/nfs4proc.c

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