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NFS: Fix an O_DIRECT Oops...

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We can't call nfs_readdata_release()/nfs_writedata_release() without
first initialising and referencing args.context. Doing so inside
nfs_direct_read_schedule_segment()/nfs_direct_write_schedule_segment()
causes an Oops.

We should rather be calling nfs_readdata_free()/nfs_writedata_free() in
those cases.

Looking at the O_DIRECT code, the "struct nfs_direct_req" is already
referencing the nfs_open_context for us. Since the readdata and writedata
structures carry a reference to that, we can simplify things by getting rid
of the extra nfs_open_context references, so that we can replace all
instances of nfs_readdata_release()/nfs_writedata_release().

Reported-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Tested-by: Catalin Marinas <catalin.marinas@arm.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Trond Myklebust
2009-08-12 09:12:30 -04:00
committed by Linus Torvalds
parent 7cb7beb31a
commit 1ae88b2e44
4 changed files with 16 additions and 21 deletions
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6
fs/nfs/write.c
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@ -87,17 +87,15 @@ struct nfs_write_data *nfs_writedata_alloc(unsigned int pagecount)
return p;
}
static void nfs_writedata_free(struct nfs_write_data *p)
void nfs_writedata_free(struct nfs_write_data *p)
{
if (p && (p->pagevec != &p->page_array[0]))
kfree(p->pagevec);
mempool_free(p, nfs_wdata_mempool);
}
void nfs_writedata_release(void *data)
static void nfs_writedata_release(struct nfs_write_data *wdata)
{
struct nfs_write_data *wdata = data;
put_nfs_open_context(wdata->args.context);
nfs_writedata_free(wdata);
}