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zdsfs: add online vtoc refresh

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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
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include/lib/dasd_base.h
+6
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@@ -170,6 +170,10 @@ struct hd_geometry {
#define BIODASDDISABLE _IO(DASD_IOCTL_LETTER, 0)
/* Enable the volume (for Linux) */
#define BIODASDENABLE _IO(DASD_IOCTL_LETTER, 1)
/* Reserve the device for the current LPAR */
#define BIODASDRSRV _IO(DASD_IOCTL_LETTER, 2)
/* Release the device for the current LPAR */
#define BIODASDRLSE _IO(DASD_IOCTL_LETTER, 3)
/* Get information on a dasd device (enhanced) */
#define BIODASDINFO2 _IOR(DASD_IOCTL_LETTER, 3, dasd_information2_t)
/* #define BIODASDFORMAT _IOW(IOCTL_LETTER,0,format_data_t) , deprecated */
@@ -203,5 +207,7 @@ int dasd_get_geo(const char *device, struct hd_geometry *geo);
int dasd_get_info(const char *device, dasd_information2_t *info);
int dasd_is_ro(const char *device, bool *ro);
int dasd_reread_partition_table(const char *device, int ntries);
int dasd_disk_reserve(const char *device);
int dasd_disk_release(const char *device);
#endif /* LIB_DASD_BASE_H */