usb: gadget: mass_storage: optional SCSI WRITE FUA bit

The nofua parameter (optionally ignore SCSI WRITE FUA) was added
to the File Storage Gadget some time ago.  This patch adds the
same functionality to the Mass Storage Function.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Andy Shevchenko <ext-andriy.shevchenko@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/gadget/f_mass_storage.c b/drivers/usb/gadget/f_mass_storage.c
index 32cce02..44e5ffe 100644 (file)
--- a/drivers/usb/gadget/f_mass_storage.c
+++ b/drivers/usb/gadget/f_mass_storage.c
@@ -73,6 +73,8 @@
  *                             being removable.
  *     ->cdrom         Flag specifying that LUN shall be reported as
  *                             being a CD-ROM.
+ *     ->nofua         Flag specifying that FUA flag in SCSI WRITE(10,12)
+ *                             commands for this LUN shall be ignored.
  *
  *     lun_name_format A printf-like format for names of the LUN
  *                             devices.  This determines how the
@@ -127,6 +129,8 @@
  *                     Default true, boolean for removable media.
  *     cdrom=b[,b...]  Default false, boolean for whether to emulate
  *                             a CD-ROM drive.
+ *     nofua=b[,b...]  Default false, booleans for ignore FUA flag
+ *                             in SCSI WRITE(10,12) commands
  *     luns=N          Default N = number of filenames, number of
  *                             LUNs to support.
  *     stall           Default determined according to the type of
@@ -409,6 +413,7 @@ struct fsg_config {
                char ro;
                char removable;
                char cdrom;
+               char nofua;
        } luns[FSG_MAX_LUNS];
 
        const char              *lun_name_format;
@@ -887,7 +892,7 @@ static int do_write(struct fsg_common *common)
                        curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
                        return -EINVAL;
                }
-               if (common->cmnd[1] & 0x08) {   /* FUA */
+               if (!curlun->nofua && (common->cmnd[1] & 0x08)) { /* FUA */
                        spin_lock(&curlun->filp->f_lock);
                        curlun->filp->f_flags |= O_SYNC;
                        spin_unlock(&curlun->filp->f_lock);
@@ -2662,6 +2667,7 @@ static int fsg_main_thread(void *common_)
 
 /* Write permission is checked per LUN in store_*() functions. */
 static DEVICE_ATTR(ro, 0644, fsg_show_ro, fsg_store_ro);
+static DEVICE_ATTR(nofua, 0644, fsg_show_nofua, fsg_store_nofua);
 static DEVICE_ATTR(file, 0644, fsg_show_file, fsg_store_file);
 
 
@@ -2768,6 +2774,9 @@ static struct fsg_common *fsg_common_init(struct fsg_common *common,
                rc = device_create_file(&curlun->dev, &dev_attr_file);
                if (rc)
                        goto error_luns;
+               rc = device_create_file(&curlun->dev, &dev_attr_nofua);
+               if (rc)
+                       goto error_luns;
 
                if (lcfg->filename) {
                        rc = fsg_lun_open(curlun, lcfg->filename);
@@ -2911,6 +2920,7 @@ static void fsg_common_release(struct kref *ref)
 
                /* In error recovery common->nluns may be zero. */
                for (; i; --i, ++lun) {
+                       device_remove_file(&lun->dev, &dev_attr_nofua);
                        device_remove_file(&lun->dev, &dev_attr_ro);
                        device_remove_file(&lun->dev, &dev_attr_file);
                        fsg_lun_close(lun);
@@ -3069,8 +3079,10 @@ struct fsg_module_parameters {
        int             ro[FSG_MAX_LUNS];
        int             removable[FSG_MAX_LUNS];
        int             cdrom[FSG_MAX_LUNS];
+       int             nofua[FSG_MAX_LUNS];
 
        unsigned int    file_count, ro_count, removable_count, cdrom_count;
+       unsigned int    nofua_count;
        unsigned int    luns;   /* nluns */
        int             stall;  /* can_stall */
 };
@@ -3096,6 +3108,8 @@ struct fsg_module_parameters {
                                "true to simulate removable media");    \
        _FSG_MODULE_PARAM_ARRAY(prefix, params, cdrom, bool,            \
                                "true to simulate CD-ROM instead of disk"); \
+       _FSG_MODULE_PARAM_ARRAY(prefix, params, nofua, bool,            \
+                               "true to ignore SCSI WRITE(10,12) FUA bit"); \
        _FSG_MODULE_PARAM(prefix, params, luns, uint,                   \
                          "number of LUNs");                            \
        _FSG_MODULE_PARAM(prefix, params, stall, bool,                  \