Add support for symbolic links using a new symlink command.
Modeled after the do_mkdir() command.
Testing demonstrates both fastlinks and slowlinks work correctly. Very
long target paths fail as the command parsing appears to truncate the
input to somewhere around 256 bytes.
Signed-off-by: Darren Hart <dvhart@xxxxxxxxxxxxx>
Cc: "Theodore Ts'o" <tytso@xxxxxxx>
Cc: "Darrick J. Wong" <darrick.wong@xxxxxxxxxx>
Cc: "Andreas Dilger" <adilger@xxxxxxxxx>
---
debugfs/debug_cmds.ct | 3 +++
debugfs/debugfs.8.in | 3 +++
debugfs/debugfs.c | 43 +++++++++++++++++++++++++++++++++++++++++++
debugfs/debugfs.h | 1 +
debugfs/dump.c | 2 +-
5 files changed, 51 insertions(+), 1 deletion(-)
diff --git a/debugfs/debug_cmds.ct b/debugfs/debug_cmds.ct
index 520933a..95d32df 100644
--- a/debugfs/debug_cmds.ct
+++ b/debugfs/debug_cmds.ct
@@ -160,6 +160,9 @@ request do_bmap, "Calculate the logical->physical block mapping for an inode",
request do_punch, "Punch (or truncate) blocks from an inode by deallocating them",
punch, truncate;
+request do_symlink, "Create a symbolic link",
+ symlink;
+
request do_imap, "Calculate the location of an inode",
imap;
diff --git a/debugfs/debugfs.8.in b/debugfs/debugfs.8.in
index bfcb1a8..c3b49f9 100644
--- a/debugfs/debugfs.8.in
+++ b/debugfs/debugfs.8.in
@@ -469,6 +469,9 @@ is, all of the blocks starting at
.I start_blk
through to the end of the file will be deallocated.
.TP
+.I symlink filespec target
+Make a symbolic link.
+.TP
.I pwd
Print the current working directory.
.TP
diff --git a/debugfs/debugfs.c b/debugfs/debugfs.c
index 341edfa..aa9a5f0 100644
--- a/debugfs/debugfs.c
+++ b/debugfs/debugfs.c
@@ -2202,6 +2202,49 @@ void do_punch(int argc, char *argv[])
}
#endif /* READ_ONLY */
+void do_symlink(int argc, char *argv[])
+{
+ char *cp;
+ ext2_ino_t parent;
+ char *name, *target;
+ errcode_t retval;
+
+ if (common_args_process(argc, argv, 3, 3, "symlink",
+ "<filename> <target>", CHECK_FS_RW))
+ return;
+
+ cp = strrchr(argv[1], '/');
+ if (cp) {
+ *cp = 0;
+ parent = string_to_inode(argv[1]);
+ if (!parent) {
+ com_err(argv[1], ENOENT, 0);
+ return;
+ }
+ name = cp+1;
+ } else {
+ parent = cwd;
+ name = argv[1];
+ }
+ target = argv[2];
+
+try_again:
+ retval = ext2fs_symlink(current_fs, parent, 0, name, target);
+ if (retval == EXT2_ET_DIR_NO_SPACE) {
+ retval = ext2fs_expand_dir(current_fs, parent);
+ if (retval) {
+ com_err(argv[0], retval, "while expanding directory");
+ return;
+ }
+ goto try_again;
+ }
+ if (retval) {
+ com_err("ext2fs_symlink", retval, 0);
+ return;
+ }
+
+}
+
void do_dump_mmp(int argc EXT2FS_ATTR((unused)), char *argv[])
{
#if CONFIG_MMP
diff --git a/debugfs/debugfs.h b/debugfs/debugfs.h
index efd8d12..bbefdf3 100644
--- a/debugfs/debugfs.h
+++ b/debugfs/debugfs.h
@@ -136,6 +136,7 @@ extern void do_imap(int argc, char **argv);
extern void do_set_current_time(int argc, char **argv);
extern void do_supported_features(int argc, char **argv);
extern void do_punch(int argc, char **argv);
+extern void do_symlink(int argc, char **argv);
extern void do_dump_mmp(int argc, char **argv);
extern void do_set_mmp_value(int argc, char **argv);
diff --git a/debugfs/dump.c b/debugfs/dump.c
index a15a0b7..2d830c9 100644
--- a/debugfs/dump.c
+++ b/debugfs/dump.c
@@ -285,7 +285,7 @@ static void rdump_inode(ext2_ino_t ino, struct ext2_inode *inode,
fix_perms("rdump", inode, -1, fullname);
}
- /* else do nothing (don't dump device files, sockets, fifos, etc.) */
+ /* else do nothing (don't dump device files, sockets, fifos, symlinks, etc.) */
errout:
free(fullname);
--
1.7.11.7
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