LU-14361 statahead: add statahead advise IOCTL

[fs/lustre-release.git] / lustre / llite / dir.c

diff --git a/lustre/llite/dir.c b/lustre/llite/dir.c
index 8e1a1fb..2856bb7 100644 (file)
--- a/lustre/llite/dir.c
+++ b/lustre/llite/dir.c
@@ -1534,6 +1534,8 @@ static char *ll_getname(const char __user *filename)
        return tmp;
 }
 
+static const char *const ladvise_names[] = LU_LADVISE_NAMES;
+
 #define ll_putname(filename) OBD_FREE(filename, NAME_MAX + 1);
 
 static long ll_dir_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
@@ -2292,6 +2294,58 @@ migrate_free:
 
                RETURN(rc);
        }
+       case LL_IOC_LADVISE2: {
+               struct llapi_lu_ladvise2 *ladvise;
+
+               OBD_ALLOC_PTR(ladvise);
+               if (ladvise == NULL)
+                       RETURN(-ENOMEM);
+
+               if (copy_from_user(ladvise, uarg, sizeof(*ladvise)))
+                       GOTO(out_ladvise, rc = -EFAULT);
+
+               switch (ladvise->lla_advice) {
+               case LU_LADVISE_AHEAD:
+                       if (ladvise->lla_start >= ladvise->lla_end) {
+                               CDEBUG(D_VFSTRACE,
+                                      "%s: Invalid range (%llu %llu) for %s\n",
+                                      sbi->ll_fsname, ladvise->lla_start,
+                                      ladvise->lla_end,
+                                      ladvise_names[ladvise->lla_advice]);
+                               GOTO(out_ladvise, rc = -EINVAL);
+                       }
+
+                       /*
+                        * Currently we only support name indexing format
+                        * ahead operations.
+                        */
+                       if (ladvise->lla_ahead_mode != LU_AH_NAME_INDEX) {
+                               CDEBUG(D_VFSTRACE,
+                                      "%s: Invalid access mode (%d) for %s\n",
+                                      sbi->ll_fsname, ladvise->lla_ahead_mode,
+                                      ladvise_names[ladvise->lla_advice]);
+                               GOTO(out_ladvise, rc = -EINVAL);
+                       }
+
+                       /* Currently we only support stat-ahead operations. */
+                       if (!(ladvise->lla_access_flags & ACCESS_FL_STAT)) {
+                               CDEBUG(D_VFSTRACE,
+                                      "%s: Invalid access flags (%x) for %s\n",
+                                      sbi->ll_fsname,
+                                      ladvise->lla_access_flags,
+                                      ladvise_names[ladvise->lla_advice]);
+                               GOTO(out_ladvise, rc = -EINVAL);
+                       }
+
+                       rc = ll_ioctl_ahead(file, ladvise);
+                       break;
+               default:
+                       rc = -EINVAL;
+               }
+out_ladvise:
+               OBD_FREE_PTR(ladvise);
+               RETURN(rc);
+       }
        case LL_IOC_PCC_DETACH_BY_FID: {
                struct lu_pcc_detach_fid *detach;
                struct lu_fid *fid;