LU-13030 pcc: auto attach not work after client cache clear

[fs/lustre-release.git] / lustre / llite / pcc.h

diff --git a/lustre/llite/pcc.h b/lustre/llite/pcc.h
index 7323a03..e704da4 100644 (file)
--- a/lustre/llite/pcc.h
+++ b/lustre/llite/pcc.h
@@ -91,20 +91,22 @@ struct pcc_matcher {
 };
 
 enum pcc_dataset_flags {
-       PCC_DATASET_NONE        = 0x0,
+       PCC_DATASET_INVALID     = 0x0,
+       /* Indicate that known the file is not in PCC. */
+       PCC_DATASET_NONE        = 0x01,
        /* Try auto attach at open, enabled by default */
-       PCC_DATASET_OPEN_ATTACH = 0x01,
+       PCC_DATASET_OPEN_ATTACH = 0x02,
        /* Try auto attach during IO when layout refresh, enabled by default */
-       PCC_DATASET_IO_ATTACH   = 0x02,
+       PCC_DATASET_IO_ATTACH   = 0x04,
        /* Try auto attach at stat */
-       PCC_DATASET_STAT_ATTACH = 0x04,
+       PCC_DATASET_STAT_ATTACH = 0x08,
        PCC_DATASET_AUTO_ATTACH = PCC_DATASET_OPEN_ATTACH |
                                  PCC_DATASET_IO_ATTACH |
                                  PCC_DATASET_STAT_ATTACH,
        /* PCC backend is only used for RW-PCC */
-       PCC_DATASET_RWPCC       = 0x08,
+       PCC_DATASET_RWPCC       = 0x10,
        /* PCC backend is only used for RO-PCC */
-       PCC_DATASET_ROPCC       = 0x10,
+       PCC_DATASET_ROPCC       = 0x20,
        /* PCC backend provides caching services for both RW-PCC and RO-PCC */
        PCC_DATASET_PCC_ALL     = PCC_DATASET_RWPCC | PCC_DATASET_ROPCC,
 };
@@ -113,7 +115,7 @@ struct pcc_dataset {
        __u32                   pccd_rwid;       /* Archive ID */
        __u32                   pccd_roid;       /* Readonly ID */
        struct pcc_match_rule   pccd_rule;       /* Match rule */
-       enum pcc_dataset_flags  pccd_flags;      /* flags of PCC backend */
+       enum pcc_dataset_flags  pccd_flags;      /* Flags of PCC backend */
        char                    pccd_pathname[PATH_MAX]; /* full path */
        struct path             pccd_path;       /* Root path */
        struct list_head        pccd_linkage;  /* Linked to pccs_datasets */
@@ -127,6 +129,12 @@ struct pcc_super {
        struct list_head         pccs_datasets;
        /* creds of process who forced instantiation of super block */
        const struct cred       *pccs_cred;
+       /*
+        * Gobal PCC Generation: it will be increased once the configuration
+        * for PCC is changed, i.e. add or delete a PCC backend, modify the
+        * parameters for PCC.
+        */
+       __u64                    pccs_generation;
 };
 
 struct pcc_inode {
@@ -176,7 +184,9 @@ enum pcc_io_type {
        /* fsync system call handling */
        PIT_FSYNC,
        /* splice_read system call */
-       PIT_SPLICE_READ
+       PIT_SPLICE_READ,
+       /* open system call */
+       PIT_OPEN
 };
 
 enum pcc_cmd_type {