From: Amir Goldstein <amir73il@xxxxxxxxxxxx>
Set/clear snapshots parent directory with chattr +/-x.
Take/delete snapshot with chattr -X +/-S.
Enable/disable snapshot with chattr -X +/-n.
View snapshot status with lsattr -X.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxxxxx>
---
lib/e2p/e2p.h | 18 ++++++++++++++++++
lib/e2p/pf.c | 33 ++++++++++++++++++++++++++++++++-
misc/chattr.c | 38 ++++++++++++++++++++++++++++++++++++--
misc/lsattr.c | 13 ++++++++++---
4 files changed, 96 insertions(+), 6 deletions(-)
diff --git a/lib/e2p/e2p.h b/lib/e2p/e2p.h
index 4a68dd9..1fbbe1b 100644
--- a/lib/e2p/e2p.h
+++ b/lib/e2p/e2p.h
@@ -26,6 +26,24 @@
/* `options' for print_flags() */
#define PFOPT_LONG 1 /* Must be 1 for compatibility with `int long_format'. */
+#define PFOPT_SNAPSHOT 2 /* list/control snapshot flags */
+#define PFOPT_SNAPSHOT_X 4 /* -X option for 'Snapshot' flags */
+
+/*
+ * snapshot status/control flags for lsattr/chattr -X.
+ * reusing compression flags on the GET/SETFLAGS ioctl for snapshot control API.
+ * all the flags below are either read-only on-disk inode flags (deleted and
+ * shrunk) or in-memory inode status flags (the rest).
+ * TODO: implement new ioctls for snapshot status/control.
+ */
+#define NEXT3_SNAPFILE_LIST_FL 0x00000100 /* snapshot is on list */
+#define NEXT3_SNAPFILE_ENABLED_FL 0x00000200 /* snapshot is enabled */
+#define NEXT3_SNAPFILE_ACTIVE_FL 0x00000400 /* snapshot is active */
+#define NEXT3_SNAPFILE_INUSE_FL 0x00000800 /* snapshot is in-use */
+#define NEXT3_SNAPFILE_DELETED_FL 0x04000000 /* snapshot is deleted */
+#define NEXT3_SNAPFILE_SHRUNK_FL 0x08000000 /* snapshot is shrunk */
+#define NEXT3_SNAPFILE_OPEN_FL 0x10000000 /* snapshot is mounted */
+#define NEXT3_SNAPFILE_TAGGED_FL 0x20000000 /* snapshot is tagged */
int fgetflags (const char * name, unsigned long * flags);
diff --git a/lib/e2p/pf.c b/lib/e2p/pf.c
index f34a5cc..063bf2a 100644
--- a/lib/e2p/pf.c
+++ b/lib/e2p/pf.c
@@ -48,16 +48,47 @@ static struct flags_name flags_array[] = {
{ EXT2_TOPDIR_FL, "T", "Top_of_Directory_Hierarchies" },
{ EXT4_EXTENTS_FL, "e", "Extents" },
{ EXT4_HUGE_FILE_FL, "h", "Huge_file" },
+ { EXT4_SNAPFILE_FL, "x", "Snapshot_File" },
+ { 0, NULL, NULL }
+};
+
+/* Traditional snapshot flags */
+static struct flags_name snapshot_flags_array[] = {
+ { NEXT3_SNAPFILE_LIST_FL, "l", "on_List" },
+ { NEXT3_SNAPFILE_ENABLED_FL, "e", "Enabled" },
+ { NEXT3_SNAPFILE_ACTIVE_FL, "a", "Active" },
+ { NEXT3_SNAPFILE_INUSE_FL, "i", "Inuse_by_previous" },
+ { NEXT3_SNAPFILE_DELETED_FL, "d", "Deleted" },
+ { NEXT3_SNAPFILE_SHRUNK_FL, "s", "Shrunk" },
+ { NEXT3_SNAPFILE_OPEN_FL, "m", "Mounted" },
+ { NEXT3_SNAPFILE_TAGGED_FL, "t", "Tagged" },
+ { 0, NULL, NULL }
+};
+
+/* Cool 'Snapshot' flags */
+static struct flags_name snapshot_X_flags_array[] = {
+ { NEXT3_SNAPFILE_LIST_FL, "S", "on_liSt" },
+ { NEXT3_SNAPFILE_ENABLED_FL, "n", "eNabled" },
+ { NEXT3_SNAPFILE_ACTIVE_FL, "a", "Active" },
+ { NEXT3_SNAPFILE_INUSE_FL, "p", "inuse_by_Previous" },
+ { NEXT3_SNAPFILE_DELETED_FL, "s", "Deleted" },
+ { NEXT3_SNAPFILE_SHRUNK_FL, "h", "sHrunk" },
+ { NEXT3_SNAPFILE_OPEN_FL, "o", "mOunted" },
+ { NEXT3_SNAPFILE_TAGGED_FL, "t", "Tagged" },
{ 0, NULL, NULL }
};
void print_flags (FILE * f, unsigned long flags, unsigned options)
{
+ struct flags_name *array = ((options & PFOPT_SNAPSHOT_X) ?
+ snapshot_X_flags_array :
+ ((options & PFOPT_SNAPSHOT) ?
+ snapshot_flags_array : flags_array));
int long_opt = (options & PFOPT_LONG);
struct flags_name *fp;
int first = 1;
- for (fp = flags_array; fp->flag != 0; fp++) {
+ for (fp = array; fp->flag != 0; fp++) {
if (flags & fp->flag) {
if (long_opt) {
if (first)
diff --git a/misc/chattr.c b/misc/chattr.c
index de33b08..449101f 100644
--- a/misc/chattr.c
+++ b/misc/chattr.c
@@ -56,6 +56,8 @@
static const char * program_name = "chattr";
+static int chsnap;
+
static int add;
static int rem;
static int set;
@@ -81,8 +83,12 @@ static unsigned long sf;
static void usage(void)
{
+ fprintf(stderr, chsnap ?
+ _("Usage: %s [-+=let] snapshot files...\n") :
+ _("Usage: %s [-RVf] [-+=AacDdeijsSux] [-v version] files...\n"),
+ program_name);
fprintf(stderr,
- _("Usage: %s [-RVf] [-+=AacDdeijsSu] [-v version] files...\n"),
+ _("Usage: %s -X [-+=Snt] snapshot files...\n"),
program_name);
exit(1);
}
@@ -92,7 +98,7 @@ struct flags_char {
char optchar;
};
-static const struct flags_char flags_array[] = {
+static const struct flags_char ext2_flags_array[] = {
{ EXT2_NOATIME_FL, 'A' },
{ EXT2_SYNC_FL, 'S' },
{ EXT2_DIRSYNC_FL, 'D' },
@@ -106,6 +112,25 @@ static const struct flags_char flags_array[] = {
{ EXT2_UNRM_FL, 'u' },
{ EXT2_NOTAIL_FL, 't' },
{ EXT2_TOPDIR_FL, 'T' },
+ { EXT4_SNAPFILE_FL, 'x' },
+ { 0, 0 }
+};
+
+static const struct flags_char *flags_array = ext2_flags_array;
+
+/* Traditional snapshot flags */
+static struct flags_char snapshot_flags_array[] = {
+ { NEXT3_SNAPFILE_LIST_FL, 'l' },
+ { NEXT3_SNAPFILE_ENABLED_FL, 'e' },
+ { NEXT3_SNAPFILE_TAGGED_FL, 't' },
+ { 0, 0 }
+};
+
+/* Cool 'Snapshot' flags */
+static struct flags_char snapshot_X_flags_array[] = {
+ { NEXT3_SNAPFILE_LIST_FL, 'S' },
+ { NEXT3_SNAPFILE_ENABLED_FL, 'n' },
+ { NEXT3_SNAPFILE_TAGGED_FL, 't' },
{ 0, 0 }
};
@@ -131,6 +156,10 @@ static int decode_arg (int * i, int argc, char ** argv)
{
case '-':
for (p = &argv[*i][1]; *p; p++) {
+ if (*p == 'X') {
+ flags_array = snapshot_X_flags_array;
+ continue;
+ }
if (*p == 'R') {
recursive = 1;
continue;
@@ -303,6 +332,11 @@ int main (int argc, char ** argv)
#endif
if (argc && *argv)
program_name = *argv;
+ i = strlen(program_name);
+ if (i >= 6 && !strcmp(program_name + i - 6, "chsnap")) {
+ flags_array = snapshot_flags_array;
+ chsnap = 1;
+ }
i = 1;
while (i < argc && !end_arg) {
/* '--' arg should end option processing */
diff --git a/misc/lsattr.c b/misc/lsattr.c
index 15b17ad..3885628 100644
--- a/misc/lsattr.c
+++ b/misc/lsattr.c
@@ -70,7 +70,7 @@ static int generation_opt;
static void usage(void)
{
- fprintf(stderr, _("Usage: %s [-RVadlv] [files...]\n"), program_name);
+ fprintf(stderr, _("Usage: %s [-XRVadlv] [files...]\n"), program_name);
exit(1);
}
@@ -169,9 +169,16 @@ int main (int argc, char ** argv)
#endif
if (argc && *argv)
program_name = *argv;
- while ((c = getopt (argc, argv, "RVadlv")) != EOF)
+ i = strlen(program_name);
+ if (i >= 6 && !strcmp(program_name + i - 6, "lssnap"))
+ pf_options |= PFOPT_SNAPSHOT;
+
+ while ((c = getopt (argc, argv, "XRVadlv")) != EOF)
switch (c)
{
+ case 'X':
+ pf_options |= PFOPT_SNAPSHOT_X;
+ break;
case 'R':
recursive = 1;
break;
@@ -185,7 +192,7 @@ int main (int argc, char ** argv)
dirs_opt = 1;
break;
case 'l':
- pf_options = PFOPT_LONG;
+ pf_options |= PFOPT_LONG;
break;
case 'v':
generation_opt = 1;
--
1.6.6
--
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