* object. This field is reset to 0 when attributes of
* any sub-object change.
*/
- int lo_attr_valid;
+ bool lo_attr_valid;
/**
* Array of sub-objects. Allocated when top-object is
* created (lov_init_raid0()).
};
struct lov_layout_entry {
- __u32 lle_type;
- struct lu_extent lle_extent;
+ __u32 lle_type;
+ unsigned int lle_valid:1;
+ struct lu_extent *lle_extent;
+ struct lov_stripe_md_entry *lle_lsme;
struct lov_comp_layout_entry_ops *lle_comp_ops;
union {
- struct lov_layout_raid0 lle_raid0;
- struct lov_layout_dom lle_dom;
+ struct lov_layout_raid0 lle_raid0;
+ struct lov_layout_dom lle_dom;
};
};
+struct lov_mirror_entry {
+ unsigned short lre_mirror_id;
+ unsigned short lre_preferred:1,
+ lre_valid:1; /* set if at least one of components
+ * in this mirror is valid */
+ unsigned short lre_start; /* index to lo_entries, start index of
+ * this mirror */
+ unsigned short lre_end; /* end index of this mirror */
+};
+
/**
* lov-specific file state.
*
} released;
struct lov_layout_composite {
/**
- * Current valid entry count of entries.
+ * flags of lov_comp_md_v1::lcm_flags. Mainly used
+ * by FLR.
+ */
+ uint32_t lo_flags;
+ /**
+ * For FLR: index of preferred mirror to read.
+ * Preferred mirror is initialized by the preferred
+ * bit of lsme. It can be changed when the preferred
+ * is inaccessible.
+ * In order to make lov_lsm_entry() return the same
+ * mirror in the same IO context, it's only possible
+ * to change the preferred mirror when the
+ * lo_active_ios reaches zero.
*/
- unsigned int lo_entry_count;
+ int lo_preferred_mirror;
+ /**
+ * For FLR: the lock to protect access to
+ * lo_preferred_mirror.
+ */
+ spinlock_t lo_write_lock;
+ /**
+ * For FLR: Number of (valid) mirrors.
+ */
+ unsigned lo_mirror_count;
+ struct lov_mirror_entry *lo_mirrors;
+ /**
+ * Current entry count of lo_entries, include
+ * invalid entries.
+ */
+ unsigned int lo_entry_count;
struct lov_layout_entry *lo_entries;
} composite;
} u;
struct task_struct *lo_owner;
};
-#define lov_foreach_layout_entry(lov, entry) \
- for (entry = &lov->u.composite.lo_entries[0]; \
- entry < &lov->u.composite.lo_entries \
- [lov->u.composite.lo_entry_count]; \
- entry++)
+static inline struct lov_layout_raid0 *lov_r0(struct lov_object *lov, int i)
+{
+ LASSERT(lov->lo_type == LLT_COMP);
+ LASSERTF(i < lov->u.composite.lo_entry_count,
+ "entry %d entry_count %d", i, lov->u.composite.lo_entry_count);
+
+ return &lov->u.composite.lo_entries[i].lle_raid0;
+}
+
+static inline struct lov_stripe_md_entry *lov_lse(struct lov_object *lov, int i)
+{
+ LASSERT(lov->lo_lsm != NULL);
+ LASSERT(i < lov->lo_lsm->lsm_entry_count);
+
+ return lov->lo_lsm->lsm_entries[i];
+}
+
+static inline unsigned lov_flr_state(const struct lov_object *lov)
+{
+ if (lov->lo_type != LLT_COMP)
+ return LCM_FL_NOT_FLR;
+
+ return lov->u.composite.lo_flags & LCM_FL_FLR_MASK;
+}
+
+static inline bool lov_is_flr(const struct lov_object *lov)
+{
+ return lov_flr_state(lov) != LCM_FL_NOT_FLR;
+}
+
+static inline struct lov_layout_entry *lov_entry(struct lov_object *lov, int i)
+{
+ LASSERT(lov->lo_type == LLT_COMP);
+ LASSERTF(i < lov->u.composite.lo_entry_count,
+ "entry %d entry_count %d", i, lov->u.composite.lo_entry_count);
+
+ return &lov->u.composite.lo_entries[i];
+}
+
+#define lov_for_layout_entry(lov, entry, start, end) \
+ for (entry = lov_entry(lov, start); \
+ entry <= lov_entry(lov, end); entry++)
+
+#define lov_foreach_layout_entry(lov, entry) \
+ lov_for_layout_entry(lov, entry, 0, \
+ (lov)->u.composite.lo_entry_count - 1)
+
+#define lov_foreach_mirror_layout_entry(lov, entry, lre) \
+ lov_for_layout_entry(lov, entry, (lre)->lre_start, (lre)->lre_end)
+
+static inline struct lov_mirror_entry *
+lov_mirror_entry(struct lov_object *lov, int i)
+{
+ LASSERT(i < lov->u.composite.lo_mirror_count);
+ return &lov->u.composite.lo_mirrors[i];
+}
+
+#define lov_foreach_mirror_entry(lov, lre) \
+ for (lre = lov_mirror_entry(lov, 0); \
+ lre <= lov_mirror_entry(lov, \
+ lov->u.composite.lo_mirror_count - 1); \
+ lre++)
+
+static inline unsigned
+lov_layout_entry_index(struct lov_object *lov, struct lov_layout_entry *entry)
+{
+ struct lov_layout_entry *first = &lov->u.composite.lo_entries[0];
+ unsigned index = (unsigned)(entry - first);
+
+ LASSERT(entry >= first);
+ LASSERT(index < lov->u.composite.lo_entry_count);
+
+ return index;
+}
/**
* State lov_lock keeps for each sub-lock.
struct lov_io {
/** super-class */
struct cl_io_slice lis_cl;
+
+ /**
+ * FLR: index to lo_mirrors. Valid only if lov_is_flr() returns true.
+ *
+ * The mirror index of this io. Preserved over cl_io_init()
+ * if io->ci_ndelay_tried is greater than zero.
+ */
+ int lis_mirror_index;
+ /**
+ * FLR: the layout gen when lis_mirror_index was cached. The
+ * mirror index makes sense only when the layout gen doesn't
+ * change.
+ */
+ int lis_mirror_layout_gen;
+
+ /**
+ * fields below this will be initialized in lov_io_init().
+ */
+ unsigned lis_preserved;
+
/**
* Pointer to the object slice. This is a duplicate of
* lov_io::lis_cl::cis_object.
* All sub-io's created in this lov_io.
*/
struct list_head lis_subios;
+
};
struct lov_session {
struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov);
int lov_page_stripe(const struct cl_page *page);
int lov_lsm_entry(const struct lov_stripe_md *lsm, __u64 offset);
+int lov_io_layout_at(struct lov_io *lio, __u64 offset);
#define lov_foreach_target(lov, var) \
for (var = 0; var < lov_targets_nr(lov); ++var)
+static inline struct lu_extent *lov_io_extent(struct lov_io *io, int i)
+{
+ return &lov_lse(io->lis_object, i)->lsme_extent;
+}
+
+/**
+ * For layout entries within @ext.
+ */
+#define lov_foreach_io_layout(ind, lio, ext) \
+ for (ind = lov_io_layout_at(lio, (ext)->e_start); \
+ ind >= 0 && \
+ lu_extent_is_overlapped(lov_io_extent(lio, ind), ext); \
+ ind = lov_io_layout_at(lio, lov_io_extent(lio, ind)->e_end))
+
/*****************************************************************************
*
* Type conversions.
return info;
}
-static inline struct lov_layout_entry *lov_entry(struct lov_object *lov, int i)
-{
- LASSERT(lov->lo_type == LLT_COMP);
- LASSERTF(i < lov->u.composite.lo_entry_count,
- "entry %d entry_count %d", i, lov->u.composite.lo_entry_count);
-
- return &lov->u.composite.lo_entries[i];
-}
-
-static inline struct lov_layout_raid0 *lov_r0(struct lov_object *lov, int i)
-{
- LASSERT(lov->lo_type == LLT_COMP);
- LASSERTF(i < lov->u.composite.lo_entry_count,
- "entry %d entry_count %d", i, lov->u.composite.lo_entry_count);
-
- return &lov->u.composite.lo_entries[i].lle_raid0;
-}
-
-static inline struct lov_stripe_md_entry *lov_lse(struct lov_object *lov, int i)
-{
- LASSERT(lov->lo_lsm != NULL);
- LASSERT(i < lov->lo_lsm->lsm_entry_count);
-
- return lov->lo_lsm->lsm_entries[i];
-}
-
/* lov_pack.c */
int lov_getstripe(const struct lu_env *env, struct lov_object *obj,
struct lov_stripe_md *lsm, struct lov_user_md __user *lump,
git://git.whamcloud.com / fs / lustre-release.git / blobdiff