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xfs: fix symbolic enum printing in ftrace output 

ftrace's __print_symbolic() has a (very poorly documented) requirement
that any enum values used in the symbol to string translation table be
wrapped in a TRACE_DEFINE_ENUM so that the enum value can be encoded in
the ftrace ring buffer.  Fix this unsatisfied requirement.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Eric Sandeen <sandeen@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-12-18 14:32:29 -08:00
parent 7af8150f99
commit 85f8dff00a
3 changed files with 26 additions and 0 deletions
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4
fs/xfs/libxfs/xfs_types.h
View File

@ -100,6 +100,10 @@ typedef void * xfs_failaddr_t;
*/
#define MAXNAMELEN 256
/*
* This enum is used in string mapping in xfs_trace.h; please keep the
* TRACE_DEFINE_ENUMs for it up to date.
*/
typedef enum {
XFS_LOOKUP_EQi, XFS_LOOKUP_LEi, XFS_LOOKUP_GEi
} xfs_lookup_t;

3
fs/xfs/xfs_aops.h
View File

@ -10,6 +10,9 @@ extern struct bio_set xfs_ioend_bioset;
/*
* Types of I/O for bmap clustering and I/O completion tracking.
*
* This enum is used in string mapping in xfs_trace.h; please keep the
* TRACE_DEFINE_ENUMs for it up to date.
*/
enum {
XFS_IO_HOLE, /* covers region without any block allocation */

19
fs/xfs/xfs_trace.h
View File

@ -640,6 +640,16 @@ DEFINE_INODE_EVENT(xfs_inode_set_cowblocks_tag);
DEFINE_INODE_EVENT(xfs_inode_clear_cowblocks_tag);
DEFINE_INODE_EVENT(xfs_inode_free_cowblocks_invalid);
/*
* ftrace's __print_symbolic requires that all enum values be wrapped in the
* TRACE_DEFINE_ENUM macro so that the enum value can be encoded in the ftrace
* ring buffer. Somehow this was only worth mentioning in the ftrace sample
* code.
*/
TRACE_DEFINE_ENUM(PE_SIZE_PTE);
TRACE_DEFINE_ENUM(PE_SIZE_PMD);
TRACE_DEFINE_ENUM(PE_SIZE_PUD);
TRACE_EVENT(xfs_filemap_fault,
TP_PROTO(struct xfs_inode *ip, enum page_entry_size pe_size,
bool write_fault),
@ -1208,6 +1218,12 @@ DEFINE_EVENT(xfs_readpage_class, name, \
DEFINE_READPAGE_EVENT(xfs_vm_readpage);
DEFINE_READPAGE_EVENT(xfs_vm_readpages);
TRACE_DEFINE_ENUM(XFS_IO_HOLE);
TRACE_DEFINE_ENUM(XFS_IO_DELALLOC);
TRACE_DEFINE_ENUM(XFS_IO_UNWRITTEN);
TRACE_DEFINE_ENUM(XFS_IO_OVERWRITE);
TRACE_DEFINE_ENUM(XFS_IO_COW);
DECLARE_EVENT_CLASS(xfs_imap_class,
TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count,
int type, struct xfs_bmbt_irec *irec),
@ -2610,6 +2626,9 @@ DEFINE_AG_ERROR_EVENT(xfs_ag_resv_init_error);
#define DEFINE_AG_EXTENT_EVENT(name) DEFINE_DISCARD_EVENT(name)
/* ag btree lookup tracepoint class */
TRACE_DEFINE_ENUM(XFS_LOOKUP_EQi);
TRACE_DEFINE_ENUM(XFS_LOOKUP_LEi);
TRACE_DEFINE_ENUM(XFS_LOOKUP_GEi);
#define XFS_AG_BTREE_CMP_FORMAT_STR \
{ XFS_LOOKUP_EQ, "eq" }, \
{ XFS_LOOKUP_LE, "le" }, \