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coda: remove CODA_STORE/CODA_RELEASE upcalls

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This is an variation on the patch sent by Christoph Hellwig which kills
file_count abuse by the Coda kernel module by moving the coda_flush
functionality into coda_release.  However part of reason we were using the
coda_flush callback was to allow Coda to pass errors that occur during
writeback from the userspace cache manager back to close().

As Al Viro explained on linux-fsdevel, it is impossible to guarantee that
such errors can in fact be returned back to the caller.  There are many
cases where the last reference to a file is not released by the close
system call and it is also impossible to pick some close as a 'last-close'
and delay it until all other references have been destroyed.

The CODA_STORE/CODA_RELEASE upcall combination is clearly a broken design,
and it is better to remove it completely.

Signed-off-by: Jan Harkes <jaharkes@cs.cmu.edu>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@ftp.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Harkes
2007-07-21 04:37:26 -07:00
committed by Linus Torvalds
parent b50731732f
commit d3fec424b2
5 changed files with 7 additions and 112 deletions
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49
fs/coda/upcall.c
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@@ -160,55 +160,8 @@ int venus_lookup(struct super_block *sb, struct CodaFid *fid,
return error;
}
int venus_store(struct super_block *sb, struct CodaFid *fid, int flags,
vuid_t uid)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
#ifdef CONFIG_CODA_FS_OLD_API
struct coda_cred cred = { 0, };
cred.cr_fsuid = uid;
#endif
insize = SIZE(store);
UPARG(CODA_STORE);
#ifdef CONFIG_CODA_FS_OLD_API
memcpy(&(inp->ih.cred), &cred, sizeof(cred));
#else
inp->ih.uid = uid;
#endif
inp->coda_store.VFid = *fid;
inp->coda_store.flags = flags;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_release(struct super_block *sb, struct CodaFid *fid, int flags)
{
union inputArgs *inp;
union outputArgs *outp;
int insize, outsize, error;
insize = SIZE(release);
UPARG(CODA_RELEASE);
inp->coda_release.VFid = *fid;
inp->coda_release.flags = flags;
error = coda_upcall(coda_vcp(sb), insize, &outsize, inp);
CODA_FREE(inp, insize);
return error;
}
int venus_close(struct super_block *sb, struct CodaFid *fid, int flags,
vuid_t uid)
vuid_t uid)
{
union inputArgs *inp;
union outputArgs *outp;