Fix: writeback: out-of-bound reads
[lttng-modules.git] / instrumentation / events / lttng-module / writeback.h
index a215f55badf5a024315dc868a1a5bc51fef11bd4..4baa85a911aeecec64827f92db27f5ec5b2e30de 100644 (file)
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #undef TRACE_SYSTEM
 #define TRACE_SYSTEM writeback
 
@@ -8,27 +9,58 @@
 #include <linux/tracepoint.h>
 #include <linux/backing-dev.h>
 #include <linux/writeback.h>
-#include <linux/version.h>
+#include <lttng-kernel-version.h>
 
 #ifndef _TRACE_WRITEBACK_DEF_
 #define _TRACE_WRITEBACK_DEF_
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(4,0,0) && \
-       LTTNG_RHEL_VERSION_CODE < LTTNG_RHEL_KERNEL_VERSION(3,10,0,327,10,1))
-static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
+/*
+ * Vanilla kernels before 4.0 do not implement inode_to_bdi
+ * RHEL kernels before 3.10.0-327.10.1 do not implement inode_to_bdi
+ * RHEL kernel 3.10.0-327.10.1 has inode_to_bdi
+ * RHEL kernel 3.10.0-327.13.1 includes a partial merge of upstream
+ *  commit a212b105b07d75b48b1a166378282e8a77fbf53d which inlines
+ *  inode_to_bdi but not sb_is_blkdev_sb making it unusable by modules.
+ */
+#if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(4,0,0))
+static inline struct backing_dev_info *lttng_inode_to_bdi(struct inode *inode)
 {
-       struct super_block *sb = inode->i_sb;
+       struct super_block *sb;
+
+       if (!inode)
+               return &noop_backing_dev_info;
+
+       sb = inode->i_sb;
 
        if (strcmp(sb->s_type->name, "bdev") == 0)
                return inode->i_mapping->backing_dev_info;
 
        return sb->s_bdi;
 }
-#endif /* #if (LINUX_VERSION_CODE < KERNEL_VERSION(4,0,0)) */
+#else
+static inline struct backing_dev_info *lttng_inode_to_bdi(struct inode *inode)
+{
+       return inode_to_bdi(inode);
+}
+#endif /* #if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(4,0,0)) */
 
 #endif
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0))
+#define show_inode_state(state)                                        \
+       __print_flags(state, "|",                               \
+               {I_DIRTY_SYNC,          "I_DIRTY_SYNC"},        \
+               {I_DIRTY_DATASYNC,      "I_DIRTY_DATASYNC"},    \
+               {I_DIRTY_PAGES,         "I_DIRTY_PAGES"},       \
+               {I_NEW,                 "I_NEW"},               \
+               {I_WILL_FREE,           "I_WILL_FREE"},         \
+               {I_FREEING,             "I_FREEING"},           \
+               {I_CLEAR,               "I_CLEAR"},             \
+               {I_SYNC,                "I_SYNC"},              \
+               {I_DIRTY_TIME,          "I_DIRTY_TIME"},        \
+               {I_REFERENCED,          "I_REFERENCED"}         \
+       )
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0))
 #define show_inode_state(state)                                        \
        __print_flags(state, "|",                               \
                {I_DIRTY_SYNC,          "I_DIRTY_SYNC"},        \
@@ -43,7 +75,7 @@ static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
                {I_DIRTY_TIME_EXPIRED,  "I_DIRTY_TIME_EXPIRED"}, \
                {I_REFERENCED,          "I_REFERENCED"}         \
        )
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0)) */
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0)) */
 #define show_inode_state(state)                                        \
        __print_flags(state, "|",                               \
                {I_DIRTY_SYNC,          "I_DIRTY_SYNC"},        \
@@ -56,16 +88,16 @@ static inline struct backing_dev_info *inode_to_bdi(struct inode *inode)
                {I_SYNC,                "I_SYNC"},              \
                {I_REFERENCED,          "I_REFERENCED"}         \
        )
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0)) */
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0)) */
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0))
 
 LTTNG_TRACEPOINT_EVENT(writeback_dirty_page,
        TP_PROTO(struct page *page, struct address_space *mapping),
        TP_ARGS(page, mapping),
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       mapping ? dev_name(inode_to_bdi(mapping->host)->dev) : "(unknown)", 32)
+               ctf_string(name,
+                       mapping ? dev_name(lttng_inode_to_bdi(mapping->host)->dev) : "(unknown)")
                ctf_integer(unsigned long, ino, mapping ? mapping->host->i_ino : 0)
                ctf_integer(pgoff_t, index, page->index)
        )
@@ -76,9 +108,9 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_dirty_inode_template,
        TP_ARGS(inode, flags),
        TP_FIELDS(
                /* may be called for files on pseudo FSes w/ unregistered bdi */
-               ctf_array_text(char, name,
-                       inode_to_bdi(inode)->dev ?
-                               dev_name(inode_to_bdi(inode)->dev) : "(unknown)", 32)
+               ctf_string(name,
+                       lttng_inode_to_bdi(inode)->dev ?
+                               dev_name(lttng_inode_to_bdi(inode)->dev) : "(unknown)")
                ctf_integer(unsigned long, ino, inode->i_ino)
                ctf_integer(unsigned long, state, inode->i_state)
                ctf_integer(unsigned long, flags, flags)
@@ -96,8 +128,8 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_write_inode_template,
        TP_PROTO(struct inode *inode, struct writeback_control *wbc),
        TP_ARGS(inode, wbc),
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       dev_name(inode_to_bdi(inode)->dev), 32)
+               ctf_string(name,
+                       dev_name(lttng_inode_to_bdi(inode)->dev))
                ctf_integer(unsigned long, ino, inode->i_ino)
                ctf_integer(int, sync_mode, wbc->sync_mode)
        )
@@ -110,14 +142,14 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE(writeback_write_inode_template, name, \
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WRITE_INODE(writeback_write_inode_start)
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WRITE_INODE(writeback_write_inode)
 
-#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0))
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,9,0))
 
 LTTNG_TRACEPOINT_EVENT(writeback_dirty_page,
        TP_PROTO(struct page *page, struct address_space *mapping),
        TP_ARGS(page, mapping),
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       mapping ? dev_name(mapping->backing_dev_info->dev) : "(unknown)", 32)
+               ctf_string(name,
+                       mapping ? dev_name(mapping->backing_dev_info->dev) : "(unknown)")
                ctf_integer(unsigned long, ino, mapping ? mapping->host->i_ino : 0)
                ctf_integer(pgoff_t, index, page->index)
        )
@@ -128,10 +160,10 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_dirty_inode_template,
        TP_ARGS(inode, flags),
        TP_FIELDS(
                /* may be called for files on pseudo FSes w/ unregistered bdi */
-               ctf_array_text(char, name,
+               ctf_string(name,
                        inode->i_mapping->backing_dev_info->dev ?
                                dev_name(inode->i_mapping->backing_dev_info->dev)
-                               : "(unknown)", 32)
+                               : "(unknown)")
                ctf_integer(unsigned long, ino, inode->i_ino)
                ctf_integer(unsigned long, flags, flags)
        )
@@ -147,8 +179,8 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_write_inode_template,
        TP_PROTO(struct inode *inode, struct writeback_control *wbc),
        TP_ARGS(inode, wbc),
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       dev_name(inode->i_mapping->backing_dev_info->dev), 32)
+               ctf_string(name,
+                       dev_name(inode->i_mapping->backing_dev_info->dev))
                ctf_integer(unsigned long, ino, inode->i_ino)
                ctf_integer(int, sync_mode, wbc->sync_mode)
        )
@@ -161,64 +193,64 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE(writeback_write_inode_template, name, \
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WRITE_INODE(writeback_write_inode_start)
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WRITE_INODE(writeback_write_inode)
 
-#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)) */
+#endif /* (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,9,0)) */
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0))
 
 LTTNG_TRACEPOINT_EVENT_CLASS(writeback_work_class,
        TP_PROTO(struct bdi_writeback *wb, struct wb_writeback_work *work),
        TP_ARGS(wb, work),
        TP_FIELDS(
-               ctf_array_text(char, name, wb->bdi->dev ? dev_name(wb->bdi->dev) :
-                               "(unknown)", 32)
+               ctf_string(name, wb->bdi->dev ? dev_name(wb->bdi->dev) :
+                               "(unknown)")
        )
 )
 
-#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0))
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0))
 
 LTTNG_TRACEPOINT_EVENT_CLASS(writeback_work_class,
        TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work),
        TP_ARGS(bdi, work),
        TP_FIELDS(
-               ctf_array_text(char, name, bdi->dev ? dev_name(bdi->dev) :
-                               "(unknown)", 32)
+               ctf_string(name, bdi->dev ? dev_name(bdi->dev) :
+                               "(unknown)")
        )
 )
 
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0)) */
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0)) */
 
 LTTNG_TRACEPOINT_EVENT_CLASS(writeback_work_class,
        TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work),
        TP_ARGS(bdi, work),
        TP_FIELDS(
-               ctf_array_text(char, name,
+               ctf_string(name,
                        dev_name(bdi->dev ? bdi->dev :
-                               default_backing_dev_info.dev), 32)
+                               default_backing_dev_info.dev))
        )
 )
 
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,0,0)) */
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,0,0)) */
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0))
 
 #define LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(name) \
 LTTNG_TRACEPOINT_EVENT_INSTANCE(writeback_work_class, name, \
        TP_PROTO(struct bdi_writeback *wb, struct wb_writeback_work *work), \
        TP_ARGS(wb, work))
 
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)) */
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0)) */
 
 #define LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(name) \
 LTTNG_TRACEPOINT_EVENT_INSTANCE(writeback_work_class, name, \
        TP_PROTO(struct backing_dev_info *bdi, struct wb_writeback_work *work), \
        TP_ARGS(bdi, work))
 
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)) */
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0)) */
 
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(writeback_nothread)
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(writeback_queue)
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(writeback_exec)
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,1,0))
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(writeback_start)
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(writeback_written)
 LTTNG_TRACEPOINT_EVENT_WRITEBACK_WORK_INSTANCE(writeback_wait)
@@ -232,14 +264,14 @@ LTTNG_TRACEPOINT_EVENT(writeback_pages_written,
        )
 )
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0))
 
 LTTNG_TRACEPOINT_EVENT_CLASS(writeback_class,
        TP_PROTO(struct bdi_writeback *wb),
        TP_ARGS(wb),
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       dev_name(wb->bdi->dev), 32)
+               ctf_string(name,
+                       dev_name(wb->bdi->dev))
        )
 )
 
@@ -258,19 +290,19 @@ LTTNG_TRACEPOINT_EVENT(writeback_bdi_register,
        TP_PROTO(struct backing_dev_info *bdi),
        TP_ARGS(bdi),
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       dev_name(bdi->dev), 32)
+               ctf_string(name,
+                       dev_name(bdi->dev))
        )
 )
 
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)) */
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0)) */
 
 LTTNG_TRACEPOINT_EVENT_CLASS(writeback_class,
        TP_PROTO(struct backing_dev_info *bdi),
        TP_ARGS(bdi),
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       dev_name(bdi->dev), 32)
+               ctf_string(name,
+                       dev_name(bdi->dev))
        )
 )
 
@@ -287,12 +319,10 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(writeback_class, name, map, \
 
 DEFINE_WRITEBACK_EVENT(writeback_bdi_register)
 
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)) */
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0)) */
 
 DEFINE_WRITEBACK_EVENT(writeback_nowork)
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38))
 DEFINE_WRITEBACK_EVENT(writeback_wake_background)
-#endif
 DEFINE_WRITEBACK_EVENT(writeback_wake_thread)
 DEFINE_WRITEBACK_EVENT(writeback_wake_forker_thread)
 DEFINE_WRITEBACK_EVENT(writeback_bdi_unregister)
@@ -311,7 +341,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_written,
        TP_ARGS(bdi, written),
 
        TP_FIELDS(
-               ctf_array_text(char, name, dev_name(bdi->dev), 32)
+               ctf_string(name, dev_name(bdi->dev))
                ctf_integer(int, written, written)
        )
 )
@@ -321,7 +351,7 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_wbc_class,
        TP_PROTO(struct writeback_control *wbc, struct backing_dev_info *bdi),
        TP_ARGS(wbc, bdi),
        TP_FIELDS(
-               ctf_array_text(char, name, dev_name(bdi->dev), 32)
+               ctf_string(name, dev_name(bdi->dev))
                ctf_integer(long, nr_to_write, wbc->nr_to_write)
                ctf_integer(long, pages_skipped, wbc->pages_skipped)
                ctf_integer(int, sync_mode, wbc->sync_mode)
@@ -329,7 +359,7 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_wbc_class,
                ctf_integer(int, for_background, wbc->for_background)
                ctf_integer(int, for_reclaim, wbc->for_reclaim)
                ctf_integer(int, range_cyclic, wbc->range_cyclic)
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0))
+#if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(3,1,0))
                ctf_integer(int, more_io, wbc->more_io)
                ctf_integer(unsigned long, older_than_this,
                        wbc->older_than_this ? *wbc->older_than_this : 0)
@@ -344,7 +374,7 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_wbc_class,
 LTTNG_TRACEPOINT_EVENT_INSTANCE_MAP(writeback_wbc_class, name, map, \
        TP_PROTO(struct writeback_control *wbc, struct backing_dev_info *bdi), \
        TP_ARGS(wbc, bdi))
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,1,0))
+#if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(3,1,0))
 LTTNG_TRACEPOINT_EVENT_WBC_INSTANCE(wbc_writeback_start, writeback_wbc_writeback_start)
 LTTNG_TRACEPOINT_EVENT_WBC_INSTANCE(wbc_writeback_written, writeback_wbc_writeback_written)
 LTTNG_TRACEPOINT_EVENT_WBC_INSTANCE(wbc_writeback_wait, writeback_wbc_writeback_wait)
@@ -354,35 +384,104 @@ LTTNG_TRACEPOINT_EVENT_WBC_INSTANCE(wbc_balance_dirty_wait, writeback_wbc_balanc
 #endif
 LTTNG_TRACEPOINT_EVENT_WBC_INSTANCE(wbc_writepage, writeback_wbc_writepage)
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,9,0) || \
+       LTTNG_KERNEL_RANGE(5,8,6, 5,9,0) || \
+       LTTNG_KERNEL_RANGE(5,4,62, 5,5,0) || \
+       LTTNG_KERNEL_RANGE(4,19,143, 4,20,0) || \
+       LTTNG_KERNEL_RANGE(4,14,196, 4,15,0) || \
+       LTTNG_KERNEL_RANGE(4,9,235, 4,10,0) || \
+       LTTNG_KERNEL_RANGE(4,4,235, 4,5,0) || \
+       LTTNG_UBUNTU_KERNEL_RANGE(4,15,18,119, 4,16,0,0))
+LTTNG_TRACEPOINT_EVENT(writeback_queue_io,
+       TP_PROTO(struct bdi_writeback *wb,
+                struct wb_writeback_work *work,
+                unsigned long dirtied_before,
+                int moved),
+       TP_ARGS(wb, work, dirtied_before, moved),
+       TP_FIELDS(
+               ctf_string(name, dev_name(wb->bdi->dev))
+               ctf_integer(unsigned long, older, dirtied_before)
+               ctf_integer(int, moved, moved)
+       )
+)
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,2,0))
 LTTNG_TRACEPOINT_EVENT(writeback_queue_io,
        TP_PROTO(struct bdi_writeback *wb,
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
                 struct wb_writeback_work *work,
-#else
-                unsigned long *older_than_this,
-#endif
                 int moved),
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
        TP_ARGS(wb, work, moved),
-#else
+       TP_FIELDS(
+               ctf_string(name, dev_name(wb->bdi->dev))
+               ctf_integer(int, moved, moved)
+       )
+)
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,1,0))
+LTTNG_TRACEPOINT_EVENT(writeback_queue_io,
+       TP_PROTO(struct bdi_writeback *wb,
+                unsigned long *older_than_this,
+                int moved),
        TP_ARGS(wb, older_than_this, moved),
-#endif
        TP_FIELDS(
-               ctf_array_text(char, name, dev_name(wb->bdi->dev), 32)
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
-#else
+               ctf_string(name, dev_name(wb->bdi->dev))
                ctf_integer(unsigned long, older,
                        older_than_this ? *older_than_this : 0)
                ctf_integer(long, age,
                        older_than_this ?
                                (jiffies - *older_than_this) * 1000 / HZ
                                : -1)
-#endif
                ctf_integer(int, moved, moved)
        )
 )
+#endif
+
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(5,8,0))
+LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
+
+       writeback_global_dirty_state,
+
+       TP_PROTO(unsigned long background_thresh,
+                unsigned long dirty_thresh
+       ),
+
+       TP_ARGS(background_thresh,
+               dirty_thresh
+       ),
+
+       TP_FIELDS(
+               ctf_integer(unsigned long, nr_dirty, global_node_page_state(NR_FILE_DIRTY))
+               ctf_integer(unsigned long, nr_writeback, global_node_page_state(NR_WRITEBACK))
+               ctf_integer(unsigned long, nr_dirtied, global_node_page_state(NR_DIRTIED))
+               ctf_integer(unsigned long, nr_written, global_node_page_state(NR_WRITTEN))
+               ctf_integer(unsigned long, background_thresh, background_thresh)
+               ctf_integer(unsigned long, dirty_thresh, dirty_thresh)
+               ctf_integer(unsigned long, dirty_limit, global_dirty_limit)
+       )
+)
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,14,0))
+LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
+
+       writeback_global_dirty_state,
+
+       TP_PROTO(unsigned long background_thresh,
+                unsigned long dirty_thresh
+       ),
+
+       TP_ARGS(background_thresh,
+               dirty_thresh
+       ),
 
+       TP_FIELDS(
+               ctf_integer(unsigned long, nr_dirty, global_node_page_state(NR_FILE_DIRTY))
+               ctf_integer(unsigned long, nr_writeback, global_node_page_state(NR_WRITEBACK))
+               ctf_integer(unsigned long, nr_unstable, global_node_page_state(NR_UNSTABLE_NFS))
+               ctf_integer(unsigned long, nr_dirtied, global_node_page_state(NR_DIRTIED))
+               ctf_integer(unsigned long, nr_written, global_node_page_state(NR_WRITTEN))
+               ctf_integer(unsigned long, background_thresh, background_thresh)
+               ctf_integer(unsigned long, dirty_thresh, dirty_thresh)
+               ctf_integer(unsigned long, dirty_limit, global_dirty_limit)
+       )
+)
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,1,0))
 LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
 
        writeback_global_dirty_state,
@@ -408,11 +507,11 @@ LTTNG_TRACEPOINT_EVENT_MAP(global_dirty_state,
 )
 #endif
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,2,0))
 
 #define KBps(x)                        ((x) << (PAGE_SHIFT - 10))
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0))
 
 LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
 
@@ -425,7 +524,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
        TP_ARGS(wb, dirty_rate, task_ratelimit),
 
        TP_FIELDS(
-               ctf_array_text(char, bdi, dev_name(wb->bdi->dev), 32)
+               ctf_string(bdi, dev_name(wb->bdi->dev))
                ctf_integer(unsigned long, write_bw, KBps(wb->bdi->wb.write_bandwidth))
                ctf_integer(unsigned long, avg_write_bw, KBps(wb->bdi->wb.avg_write_bandwidth))
                ctf_integer(unsigned long, dirty_rate, KBps(dirty_rate))
@@ -436,7 +535,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
        )
 )
 
-#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0))
+#elif (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,2,0))
 
 LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
 
@@ -449,7 +548,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
        TP_ARGS(bdi, dirty_rate, task_ratelimit),
 
        TP_FIELDS(
-               ctf_array_text(char, bdi, dev_name(bdi->dev), 32)
+               ctf_string(bdi, dev_name(bdi->dev))
                ctf_integer(unsigned long, write_bw, KBps(bdi->wb.write_bandwidth))
                ctf_integer(unsigned long, avg_write_bw, KBps(bdi->wb.avg_write_bandwidth))
                ctf_integer(unsigned long, dirty_rate, KBps(dirty_rate))
@@ -460,7 +559,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
        )
 )
 
-#else /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)) */
+#else /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,2,0)) */
 
 LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
 
@@ -473,7 +572,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
        TP_ARGS(bdi, dirty_rate, task_ratelimit),
 
        TP_FIELDS(
-               ctf_array_text(char, bdi, dev_name(bdi->dev), 32)
+               ctf_string(bdi, dev_name(bdi->dev))
                ctf_integer(unsigned long, write_bw, KBps(bdi->write_bandwidth))
                ctf_integer(unsigned long, avg_write_bw, KBps(bdi->avg_write_bandwidth))
                ctf_integer(unsigned long, dirty_rate, KBps(dirty_rate))
@@ -484,9 +583,9 @@ LTTNG_TRACEPOINT_EVENT_MAP(bdi_dirty_ratelimit,
        )
 )
 
-#endif /* #else #if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,2,0)) */
+#endif /* #else #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,2,0)) */
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0))
 
 LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
 
@@ -511,7 +610,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
        ),
 
        TP_FIELDS(
-               ctf_array_text(char, bdi, dev_name(wb->bdi->dev), 32)
+               ctf_string(bdi, dev_name(wb->bdi->dev))
                ctf_integer(unsigned long, limit, global_dirty_limit)
                ctf_integer(unsigned long, setpoint,
                        (global_dirty_limit + (thresh + bg_thresh) / 2) / 2)
@@ -538,7 +637,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
        )
 )
 
-#else /* #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)) */
+#else /* #if LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0)) */
 
 LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
 
@@ -553,7 +652,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
                 unsigned long dirty_ratelimit,
                 unsigned long task_ratelimit,
                 unsigned long dirtied,
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,3,0))
                 unsigned long period,
 #endif
                 long pause,
@@ -561,7 +660,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
 
        TP_ARGS(bdi, thresh, bg_thresh, dirty, bdi_thresh, bdi_dirty,
                dirty_ratelimit, task_ratelimit,
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,3,0))
                dirtied, period, pause, start_time
 #else
                dirtied, pause, start_time
@@ -569,7 +668,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
        ),
 
        TP_FIELDS(
-               ctf_array_text(char, bdi, dev_name(bdi->dev), 32)
+               ctf_string(bdi, dev_name(bdi->dev))
                ctf_integer(unsigned long, limit, global_dirty_limit)
                ctf_integer(unsigned long, setpoint,
                        (global_dirty_limit + (thresh + bg_thresh) / 2) / 2)
@@ -588,7 +687,7 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
                ctf_integer(unsigned long, paused,
                        (jiffies - start_time) * 1000 / HZ)
                ctf_integer(long, pause, pause * 1000 / HZ)
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,3,0))
                ctf_integer(unsigned long, period,
                        period * 1000 / HZ)
                ctf_integer(long, think,
@@ -597,19 +696,19 @@ LTTNG_TRACEPOINT_EVENT_MAP(balance_dirty_pages,
 #endif
        )
 )
-#endif /* #else #if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)) */
+#endif /* #else #if LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(4,3,0)) */
 
-#endif /* #if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)) */
+#endif /* #if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,2,0)) */
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,5,0))
 LTTNG_TRACEPOINT_EVENT(writeback_sb_inodes_requeue,
 
        TP_PROTO(struct inode *inode),
        TP_ARGS(inode),
 
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       dev_name(inode_to_bdi(inode)->dev), 32)
+               ctf_string(name,
+                       dev_name(lttng_inode_to_bdi(inode)->dev))
                ctf_integer(unsigned long, ino, inode->i_ino)
                ctf_integer(unsigned long, state, inode->i_state)
                ctf_integer(unsigned long, dirtied_when, inode->dirtied_when)
@@ -617,7 +716,6 @@ LTTNG_TRACEPOINT_EVENT(writeback_sb_inodes_requeue,
 )
 #endif
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,37))
 LTTNG_TRACEPOINT_EVENT_CLASS(writeback_congest_waited_template,
 
        TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),
@@ -643,9 +741,8 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE(writeback_congest_waited_template, writeback_wai
 
        TP_ARGS(usec_timeout, usec_delayed)
 )
-#endif
 
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0))
+#if (LTTNG_LINUX_VERSION_CODE >= LTTNG_KERNEL_VERSION(3,1,0))
 LTTNG_TRACEPOINT_EVENT_CLASS(writeback_single_inode_template,
 
        TP_PROTO(struct inode *inode,
@@ -656,8 +753,8 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_single_inode_template,
        TP_ARGS(inode, wbc, nr_to_write),
 
        TP_FIELDS(
-               ctf_array_text(char, name,
-                       dev_name(inode_to_bdi(inode)->dev), 32)
+               ctf_string(name,
+                       dev_name(lttng_inode_to_bdi(inode)->dev))
                ctf_integer(unsigned long, ino, inode->i_ino)
                ctf_integer(unsigned long, state, inode->i_state)
                ctf_integer(unsigned long, dirtied_when, inode->dirtied_when)
@@ -669,7 +766,7 @@ LTTNG_TRACEPOINT_EVENT_CLASS(writeback_single_inode_template,
        )
 )
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3,5,0))
+#if (LTTNG_LINUX_VERSION_CODE < LTTNG_KERNEL_VERSION(3,5,0))
 LTTNG_TRACEPOINT_EVENT_INSTANCE(writeback_single_inode_template, writeback_single_inode_requeue,
        TP_PROTO(struct inode *inode,
                struct writeback_control *wbc,
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