kata-containers/s390-tools
1
0
Fork 0
mirror of https://github.com/ibm-s390-linux/s390-tools.git synced 2026-08-05 02:14:52 +00:00
Code Issues Packages Projects Releases Wiki Activity

zdsfs: add online vtoc refresh

Browse Source 
Enable zdsfs to access datasets that were created after zdsfs was
mounted without the need to remount zdsfs.
This is done by re-reading the VTOC with every readdir system call.
To ensure a consistent VTOC state the DASD device is reserved for
every VTOC read and released afterwards.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Stefan Haberland
2018-12-11 17:27:34 +01:00
committed by Jan Höppner
parent e9c030f202
commit bc053a975a
6 changed files with 280 additions and 131 deletions
Download Patch File Download Diff File Expand all files Collapse all files
zdsfs/zdsfs.c
+80 -17
View File
@@ -53,6 +53,8 @@ struct zdsfs_info {
};
static struct zdsfs_info zdsfsinfo;
static int zdsfs_create_meta_data_buffer(struct zdsfs_info *);
static int zdsfs_verify_datasets(void);
struct zdsfs_file_info {
struct dshandle *dsh;
@@ -193,6 +195,48 @@ static int zdsfs_getattr(const char *path, struct stat *stbuf)
return 0;
}
static void zdsfs_read_device(struct dasd *newdasd, const char *device)
{
struct errorlog *log;
int rc;
rc = dasd_disk_reserve(device);
if (rc) {
fprintf(stderr, "error when reserving device %s: %s\n",
device, strerror(rc));
lzds_dasd_get_errorlog(newdasd, &log);
lzds_errorlog_fprint(log, stderr);
exit(1);
}
rc = lzds_dasd_alloc_rawvtoc(newdasd);
if (rc) {
fprintf(stderr, "error when reading VTOC from device %s: %s\n",
device, strerror(rc));
lzds_dasd_get_errorlog(newdasd, &log);
lzds_errorlog_fprint(log, stderr);
exit(1);
}
rc = lzds_zdsroot_extract_datasets_from_dasd(zdsfsinfo.zdsroot,
newdasd);
if (rc) {
fprintf(stderr,
"error when extracting data sets from dasd %s: %s\n",
device, strerror(rc));
lzds_zdsroot_get_errorlog(zdsfsinfo.zdsroot, &log);
lzds_errorlog_fprint(log, stderr);
exit(1);
}
rc = dasd_disk_release(device);
if (rc) {
fprintf(stderr, "error when releasing device %s: %s\n",
device, strerror(rc));
lzds_dasd_get_errorlog(newdasd, &log);
lzds_errorlog_fprint(log, stderr);
exit(1);
}
}
static int zdsfs_statfs(const char *UNUSED(path), struct statvfs *statvfs)
{
struct dasditerator *dasdit;
@@ -239,6 +283,33 @@ static int zdsfs_statfs(const char *UNUSED(path), struct statvfs *statvfs)
return 0;
}
static int zdsfs_update_vtoc(void)
{
struct dasditerator *dasdit;
struct dasd *dasd;
int rc;
lzds_dslist_free(zdsfsinfo.zdsroot);
rc = lzds_zdsroot_alloc_dasditerator(zdsfsinfo.zdsroot, &dasdit);
if (rc)
return -ENOMEM;
while (!lzds_dasditerator_get_next_dasd(dasdit, &dasd))
zdsfs_read_device(dasd, dasd->device);
lzds_dasditerator_free(dasdit);
rc = zdsfs_verify_datasets();
if (rc)
return rc;
rc = zdsfs_create_meta_data_buffer(&zdsfsinfo);
if (rc)
return rc;
return 0;
}
static int zdsfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
off_t UNUSED(offset), struct fuse_file_info *UNUSED(fi))
{
@@ -252,6 +323,10 @@ static int zdsfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler,
int rc;
int ispds, issupported;
rc = zdsfs_update_vtoc();
if (rc)
return rc;
/* we have two type of directories
* type one: the root directory contains all data sets
*/
@@ -328,6 +403,9 @@ static int zdsfs_open(const char *path, struct fuse_file_info *fi)
goto error1;
if (strcmp(path, "/"METADATAFILE) == 0) {
rc = zdsfs_update_vtoc();
if (rc)
return rc;
zfi->dsh = NULL;
zfi->is_metadata_file = 1;
zfi->metaread = 0;
@@ -595,6 +673,7 @@ static int zdsfs_verify_datasets(void)
if (rc)
return ENOMEM;
while (!lzds_dsiterator_get_next_dataset(dsit, &ds)) {
lzds_dataset_get_name(ds, &dsname);
lzds_dataset_get_is_complete(ds, &iscomplete);
if (!iscomplete) {
lzds_dataset_get_name(ds, &dsname);
@@ -821,23 +900,7 @@ static void zdsfs_process_device(const char *device)
lzds_errorlog_fprint(log, stderr);
exit(1);
}
rc = lzds_dasd_read_rawvtoc(newdasd);
if (rc) {
fprintf(stderr, "error when reading VTOC from device %s:"
" %s\n", device, strerror(rc));
lzds_dasd_get_errorlog(newdasd, &log);
lzds_errorlog_fprint(log, stderr);
exit(1);
}
rc = lzds_zdsroot_extract_datasets_from_dasd(zdsfsinfo.zdsroot,
newdasd);
if (rc) {
fprintf(stderr, "error when extracting data sets from dasd %s:"
" %s\n", device, strerror(rc));
lzds_zdsroot_get_errorlog(zdsfsinfo.zdsroot, &log);
lzds_errorlog_fprint(log, stderr);
exit(1);
}
zdsfs_read_device(newdasd, device);
}
static void zdsfs_process_device_file(const char *devfile)