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xfs_io: v8 add the lseek() SEEK_DATA/SEEK_HOLE support

PATCH In review Mark Tinguely 2 participants 3 messages Aug 23, 2013 – Aug 28, 2013

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Mark Tinguely

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PATCH 1/1 xfs_io: v8 add the lseek() SEEK_DATA/SEEK_HOLE support

Add the lseek SEEK_DATA/SEEK_HOLE support into xfs_io. The result from the lseek() call will be printed to the output. For example:

xfs_io> seek -hs 609k
Whence Start Result
HOLE 623616 630784

Signed-off-by Mark Tinguely <[email protected]>

---
The "Wow! I could have had a v8"* patch * TM of Cambell's Soup Company.
Fix v7 bug by re-adding the flag mask check before calling seek_output(). Add Eric's thought to display starting offset to output - using -s flag.. Add table descriptor.

 io/Makefile       |    3 
 io/init.c         |    1 
 io/io.h           |    1 
 io/seek.c         |  224 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 man/man8/xfs_io.8 |   39 +++++++++
 5 files changed, 267 insertions(+), 1 deletion(-)
io/Makefile +2 -1
Index: b/io/Makefile
===================================================================
@@ -10,7 +10,8 @@ LSRCFILES = xfs_bmap.sh xfs_freeze.sh xf
 HFILES = init.h io.h
 CFILES = init.c \
 	attr.c bmap.c file.c freeze.c fsync.c getrusage.c imap.c mmap.c \
-	open.c parent.c pread.c prealloc.c pwrite.c shutdown.c truncate.c
+	open.c parent.c pread.c prealloc.c pwrite.c seek.c shutdown.c \
+	truncate.c
 
 LLDLIBS = $(LIBXCMD) $(LIBHANDLE)
 LTDEPENDENCIES = $(LIBXCMD) $(LIBHANDLE)
io/init.c +1 -0
Index: b/io/init.c
===================================================================
@@ -64,6 +64,7 @@ init_commands(void)
 	help_init();
 	imap_init();
 	inject_init();
+	seek_init();
 	madvise_init();
 	mincore_init();
 	mmap_init();
io/io.h +1 -0
Index: b/io/io.h
===================================================================
@@ -105,6 +105,7 @@ extern void		pread_init(void);
 extern void		prealloc_init(void);
 extern void		pwrite_init(void);
 extern void		quit_init(void);
+extern void		seek_init(void);
 extern void		shutdown_init(void);
 extern void		truncate_init(void);
io/seek.c new file +224 -0

224 lines not on this page · raw message

man/man8/xfs_io.8 +39 -0
Index: b/man/man8/xfs_io.8
===================================================================
@@ -418,6 +418,45 @@ to read (in bytes)
 .RE
 .PD
 .TP
+.TP
+.BI "seek  \-a | \-d | \-h [ \-r ] [ \-s ] offset"
+On platforms that support the
+.BR lseek (2)
+.B SEEK_DATA
+and
+.B SEEK_HOLE
+options, display the offsets of the specified segments.
+.RS 1.0i
+.PD 0
+.TP 0.4i
+.B \-a
+Display both
+.B data
+and
+.B hole
+segments starting at the specified
+.B offset.
+.TP
+.B \-d
+Display the
+.B data
+segment starting at the specified
+.B offset.
+.TP
+.B \-h
+Display the
+.B hole
+segment starting at the specified
+.B offset.
+.TP
+.B \-r
+Recursively display all the specified segments starting at the specified
+.B offset.
+.TP
+.B \-s
+Display the starting lseek(2) offset. This offset will be a calculated value when
+both data and holes are displayed together or performing a recusively display.
+.TP
 
 .SH MEMORY MAPPED I/O COMMANDS
 .TP

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