staging/lustre/llite: optimize ll_fid2path()

The only parameter from userspace that matters is the length of the
buffer. We don't need to allocate then import the whole structure. By
importing only that length, we can save a memory allocation.

Add sparse annotations to that function.

Signed-off-by: frank zago <fzago@cray.com>
Reviewed-on: http://review.whamcloud.com/11167
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5389
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
index 084fb9206fd5b42482f94f268b01f43c3e1e4bfa..d3874e1afba8d83613f32883ca68570b86407fab 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/file.c
+++ b/drivers/staging/lustre/lustre/llite/file.c
@@ -1702,37 +1702,35 @@ out:
        return rc;
 }
 
-int ll_fid2path(struct inode *inode, void *arg)
+int ll_fid2path(struct inode *inode, void __user *arg)
 {
-       struct obd_export       *exp = ll_i2mdexp(inode);
-       struct getinfo_fid2path *gfout, *gfin;
-       int                      outsize, rc;
+       struct obd_export *exp = ll_i2mdexp(inode);
+       const struct getinfo_fid2path __user *gfin = arg;
+       struct getinfo_fid2path *gfout;
+       u32 pathlen;
+       size_t outsize;
+       int rc;
 
        if (!capable(CFS_CAP_DAC_READ_SEARCH) &&
            !(ll_i2sbi(inode)->ll_flags & LL_SBI_USER_FID2PATH))
                return -EPERM;
 
-       /* Need to get the buflen */
-       OBD_ALLOC_PTR(gfin);
-       if (gfin == NULL)
-               return -ENOMEM;
-       if (copy_from_user(gfin, arg, sizeof(*gfin))) {
-               OBD_FREE_PTR(gfin);
+       /* Only need to get the buflen */
+       if (get_user(pathlen, &gfin->gf_pathlen))
                return -EFAULT;
-       }
 
-       outsize = sizeof(*gfout) + gfin->gf_pathlen;
+       outsize = sizeof(*gfout) + pathlen;
+
        OBD_ALLOC(gfout, outsize);
-       if (gfout == NULL) {
-               OBD_FREE_PTR(gfin);
+       if (gfout == NULL)
                return -ENOMEM;
-       }
-       memcpy(gfout, gfin, sizeof(*gfout));
-       OBD_FREE_PTR(gfin);
+
+       if (copy_from_user(gfout, arg, sizeof(*gfout)))
+               GOTO(gf_free, rc = -EFAULT);
 
        /* Call mdc_iocontrol */
        rc = obd_iocontrol(OBD_IOC_FID2PATH, exp, outsize, gfout, NULL);
-       if (rc)
+       if (rc != 0)
                GOTO(gf_free, rc);
 
        if (copy_to_user(arg, gfout, outsize))

diff --git a/drivers/staging/lustre/lustre/llite/llite_internal.h b/drivers/staging/lustre/lustre/llite/llite_internal.h
index 684405e26b5841076c3f491f492f83e9f7a9aa30..b42d87971f5ecb0cb3c6079cd781707212922cdc 100644 (file)
--- a/drivers/staging/lustre/lustre/llite/llite_internal.h
+++ b/drivers/staging/lustre/lustre/llite/llite_internal.h
@@ -775,7 +775,7 @@ int ll_dir_getstripe(struct inode *inode, struct lov_mds_md **lmmp,
                     int *lmm_size, struct ptlrpc_request **request);
 int ll_fsync(struct file *file, loff_t start, loff_t end, int data);
 int ll_merge_lvb(const struct lu_env *env, struct inode *inode);
-int ll_fid2path(struct inode *inode, void *arg);
+int ll_fid2path(struct inode *inode, void __user *arg);
 int ll_data_version(struct inode *inode, __u64 *data_version, int extent_lock);
 int ll_hsm_release(struct inode *inode);