1 files changed, 59 insertions, 45 deletions

diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
index 5a77fc76433f..39ad50165162 100644
--- a/fs/exofs/exofs.h
+++ b/fs/exofs/exofs.h
@@ -52,9 +52,12 @@
 /* u64 has problems with printk this will cast it to unsigned long long */
 #define _LLU(x) (unsigned long long)(x)
 
-struct exofs_layout {
-        osd_id          s_pid;                  /* partition ID of file system*/
+struct exofs_comp {
+        struct osd_obj_id       obj;
+        u8                      cred[OSD_CAP_LEN];
+};
 
+struct exofs_layout {
         /* Our way of looking at the data_map */
         unsigned stripe_unit;
         unsigned mirrors_p1;
@@ -62,11 +65,18 @@ struct exofs_layout {
         unsigned group_width;
         u64      group_depth;
         unsigned group_count;
+};
 
-        enum exofs_inode_layout_gen_functions lay_func;
-
-        unsigned        s_numdevs;              /* Num of devices in array    */
-        struct osd_dev  **s_ods;                /* osd_dev array              */
+struct exofs_components {
+        unsigned        numdevs;                /* Num of devices in array    */
+        /* If @single_comp == EC_SINGLE_COMP, @comps points to a single
+         * component. else there are @numdevs components
+         */
+        enum EC_COMP_USAGE {
+                EC_SINGLE_COMP = 0, EC_MULTPLE_COMPS = 0xffffffff
+        } single_comp;
+        struct exofs_comp *comps;
+        struct osd_dev  **ods;                  /* osd_dev array              */
 };
 
 /*
@@ -81,12 +91,13 @@ struct exofs_sb_info {
         spinlock_t      s_next_gen_lock;        /* spinlock for gen # update  */
         u32             s_next_generation;      /* next gen # to use          */
         atomic_t        s_curr_pending;         /* number of pending commands */
-        uint8_t         s_cred[OSD_CAP_LEN];    /* credential for the fscb    */
 
         struct pnfs_osd_data_map data_map;      /* Default raid to use
                                                  * FIXME: Needed ?
                                                  */
         struct exofs_layout     layout;         /* Default files layout       */
+        struct exofs_comp one_comp;             /* id & cred of partition id=0*/
+        struct exofs_components comps;          /* comps for the partition    */
         struct osd_dev  *_min_one_dev[1];       /* Place holder for one dev   */
 };
 
@@ -100,7 +111,8 @@ struct exofs_i_info {
         uint32_t       i_data[EXOFS_IDATA];/*short symlink names and device #s*/
         uint32_t       i_dir_start_lookup; /* which page to start lookup      */
         uint64_t       i_commit_size;      /* the object's written length     */
-        uint8_t        i_cred[OSD_CAP_LEN];/* all-powerful credential         */
+        struct exofs_comp one_comp;        /* same component for all devices  */
+        struct exofs_components comps;     /* inode view of the device table  */
 };
 
 static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
@@ -118,8 +130,7 @@ struct exofs_io_state {
         exofs_io_done_fn        done;
 
         struct exofs_layout     *layout;
-        struct osd_obj_id       obj;
-        u8                      *cred;
+        struct exofs_components *comps;
 
         /* Global read/write IO*/
         loff_t                  offset;
@@ -200,20 +211,6 @@ static inline struct exofs_i_info *exofs_i(struct inode *inode)
 }
 
 /*
- * Given a layout, object_number and stripe_index return the associated global
- * dev_index
- */
-unsigned exofs_layout_od_id(struct exofs_layout *layout,
-                            osd_id obj_no, unsigned layout_index);
-
-static inline struct osd_dev *exofs_ios_od(struct exofs_io_state *ios,
-                                           unsigned layout_index)
-{
-        return ios->layout->s_ods[
-                exofs_layout_od_id(ios->layout, ios->obj.id, layout_index)];
-}
-
-/*
  * Maximum count of links to a file
  */
 #define EXOFS_LINK_MAX           32000
@@ -223,10 +220,13 @@ static inline struct osd_dev *exofs_ios_od(struct exofs_io_state *ios,
  *************************/
 
 /* ios.c */
-int  exofs_get_rw_state(struct exofs_layout *layout, bool is_reading,
-                        u64 offset, u64 length, struct exofs_io_state **ios);
-int  exofs_get_io_state(struct exofs_layout *layout,
-                        struct exofs_io_state **ios);
+int exofs_get_rw_state(struct exofs_layout *layout,
+                       struct exofs_components *comps,
+                       bool is_reading, u64 offset, u64 length,
+                       struct exofs_io_state **ios);
+int exofs_get_io_state(struct exofs_layout *layout,
+                       struct exofs_components *comps,
+                       struct exofs_io_state **ios);
 void exofs_put_io_state(struct exofs_io_state *ios);
 
 int exofs_check_io(struct exofs_io_state *ios, u64 *resid);
@@ -235,27 +235,12 @@ int exofs_sbi_create(struct exofs_io_state *ios);
 int exofs_sbi_remove(struct exofs_io_state *ios);
 int exofs_sbi_write(struct exofs_io_state *ios);
 int exofs_sbi_read(struct exofs_io_state *ios);
+int exofs_truncate(struct exofs_layout *layout, struct exofs_components *comps,
+                 u64 size);
 
 int extract_attr_from_ios(struct exofs_io_state *ios, struct osd_attr *attr);
 extern const struct osd_attr g_attr_logical_length;
 
-int exofs_oi_truncate(struct exofs_i_info *oi, u64 new_len);
-static inline int exofs_oi_write(struct exofs_i_info *oi,
-                                 struct exofs_io_state *ios)
-{
-        ios->obj.id = exofs_oi_objno(oi);
-        ios->cred = oi->i_cred;
-        return exofs_sbi_write(ios);
-}
-
-static inline int exofs_oi_read(struct exofs_i_info *oi,
-                                struct exofs_io_state *ios)
-{
-        ios->obj.id = exofs_oi_objno(oi);
-        ios->cred = oi->i_cred;
-        return exofs_sbi_read(ios);
-}
-
 /* inode.c               */
 unsigned exofs_max_io_pages(struct exofs_layout *layout,
                             unsigned expected_pages);
@@ -307,4 +292,33 @@ extern const struct inode_operations exofs_special_inode_operations;
 extern const struct inode_operations exofs_symlink_inode_operations;
 extern const struct inode_operations exofs_fast_symlink_inode_operations;
 
+/* exofs_init_comps will initialize an exofs_components device array
+ * pointing to a single exofs_comp struct, and a round-robin view
+ * of the device table.
+ * The first device of each inode is the [inode->ino % num_devices]
+ * and the rest of the devices sequentially following where the
+ * first device is after the last device.
+ * It is assumed that the global device array at @sbi is twice
+ * bigger and that the device table repeats twice.
+ * See: exofs_read_lookup_dev_table()
+ */
+static inline void exofs_init_comps(struct exofs_components *comps,
+                                    struct exofs_comp *one_comp,
+                                    struct exofs_sb_info *sbi, osd_id oid)
+{
+        unsigned dev_mod = (unsigned)oid, first_dev;
+
+        one_comp->obj.partition = sbi->one_comp.obj.partition;
+        one_comp->obj.id = oid;
+        exofs_make_credential(one_comp->cred, &one_comp->obj);
+
+        comps->numdevs = sbi->comps.numdevs;
+        comps->single_comp = EC_SINGLE_COMP;
+        comps->comps = one_comp;
+
+        /* Round robin device view of the table */
+        first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->comps.numdevs;
+        comps->ods = sbi->comps.ods + first_dev;
+}
+
 #endif