staging: lustre: Remove unused memhog functionality

Remove IOC_LIBCFS_MEMHOG ioctl functionality as it is no longer needed thereby
making functions like - kportal_memhog_alloc(), kportal_memhog_free() and type -
struct libcfs_device_userstate unused.

Signed-off-by: Niranjan Dighe <ndighe@visteon.com>
Acked-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h
index a80d993..dab4862 100644 (file)
--- a/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h
+++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_private.h
@@ -387,11 +387,6 @@ int cfs_percpt_atomic_summary(atomic_t **refs);
  * Support for temporary event tracing with minimal Heisenberg effect.
  * -------------------------------------------------------------------- */
 
-struct libcfs_device_userstate {
-       int        ldu_memhog_pages;
-       struct page   *ldu_memhog_root_page;
-};
-
 #define MKSTR(ptr) ((ptr)) ? (ptr) : ""
 
 static inline int cfs_size_round4(int val)

diff --git a/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c b/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
index 70a99cf..eccfe8b 100644 (file)
--- a/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
+++ b/drivers/staging/lustre/lustre/libcfs/linux/linux-module.c
@@ -98,14 +98,12 @@ int libcfs_ioctl_popdata(void *arg, void *data, int size)
 static int
 libcfs_psdev_open(struct inode *inode, struct file *file)
 {
-       struct libcfs_device_userstate **pdu = NULL;
        int    rc = 0;
 
        if (!inode)
                return -EINVAL;
-       pdu = (struct libcfs_device_userstate **)&file->private_data;
        if (libcfs_psdev_ops.p_open != NULL)
-               rc = libcfs_psdev_ops.p_open(0, (void *)pdu);
+               rc = libcfs_psdev_ops.p_open(0, NULL);
        else
                return -EPERM;
        return rc;
@@ -115,14 +113,12 @@ libcfs_psdev_open(struct inode *inode, struct file *file)
 static int
 libcfs_psdev_release(struct inode *inode, struct file *file)
 {
-       struct libcfs_device_userstate *pdu;
        int    rc = 0;
 
        if (!inode)
                return -EINVAL;
-       pdu = file->private_data;
        if (libcfs_psdev_ops.p_close != NULL)
-               rc = libcfs_psdev_ops.p_close(0, (void *)pdu);
+               rc = libcfs_psdev_ops.p_close(0, NULL);
        else
                rc = -EPERM;
        return rc;
@@ -152,14 +148,8 @@ static long libcfs_ioctl(struct file *file,
                        return -EPERM;
                panic("debugctl-invoked panic");
                return 0;
-       case IOC_LIBCFS_MEMHOG:
-               if (!capable(CFS_CAP_SYS_ADMIN))
-                       return -EPERM;
-               /* go thought */
        }
 
-       pfile.off = 0;
-       pfile.private_data = file->private_data;
        if (libcfs_psdev_ops.p_ioctl != NULL)
                rc = libcfs_psdev_ops.p_ioctl(&pfile, cmd, (void *)arg);
        else

diff --git a/drivers/staging/lustre/lustre/libcfs/module.c b/drivers/staging/lustre/lustre/libcfs/module.c
index 329d78c..0067e53 100644 (file)
--- a/drivers/staging/lustre/lustre/libcfs/module.c
+++ b/drivers/staging/lustre/lustre/libcfs/module.c
@@ -68,142 +68,16 @@ MODULE_LICENSE("GPL");
 
 static struct dentry *lnet_debugfs_root;
 
-static void kportal_memhog_free(struct libcfs_device_userstate *ldu)
-{
-       struct page **level0p = &ldu->ldu_memhog_root_page;
-       struct page **level1p;
-       struct page **level2p;
-       int        count1;
-       int        count2;
-
-       if (*level0p != NULL) {
-
-               level1p = (struct page **)page_address(*level0p);
-               count1 = 0;
-
-               while (count1 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
-                      *level1p != NULL) {
-
-                       level2p = (struct page **)page_address(*level1p);
-                       count2 = 0;
-
-                       while (count2 < PAGE_CACHE_SIZE/sizeof(struct page *) &&
-                              *level2p != NULL) {
-
-                               __free_page(*level2p);
-                               ldu->ldu_memhog_pages--;
-                               level2p++;
-                               count2++;
-                       }
-
-                       __free_page(*level1p);
-                       ldu->ldu_memhog_pages--;
-                       level1p++;
-                       count1++;
-               }
-
-               __free_page(*level0p);
-               ldu->ldu_memhog_pages--;
-
-               *level0p = NULL;
-       }
-
-       LASSERT(ldu->ldu_memhog_pages == 0);
-}
-
-static int kportal_memhog_alloc(struct libcfs_device_userstate *ldu, int npages,
-                    gfp_t flags)
-{
-       struct page **level0p;
-       struct page **level1p;
-       struct page **level2p;
-       int        count1;
-       int        count2;
-
-       LASSERT(ldu->ldu_memhog_pages == 0);
-       LASSERT(ldu->ldu_memhog_root_page == NULL);
-
-       if (npages < 0)
-               return -EINVAL;
-
-       if (npages == 0)
-               return 0;
-
-       level0p = &ldu->ldu_memhog_root_page;
-       *level0p = alloc_page(flags);
-       if (*level0p == NULL)
-               return -ENOMEM;
-       ldu->ldu_memhog_pages++;
-
-       level1p = (struct page **)page_address(*level0p);
-       count1 = 0;
-       memset(level1p, 0, PAGE_CACHE_SIZE);
-
-       while (ldu->ldu_memhog_pages < npages &&
-              count1 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
-
-               if (cfs_signal_pending())
-                       return -EINTR;
-
-               *level1p = alloc_page(flags);
-               if (*level1p == NULL)
-                       return -ENOMEM;
-               ldu->ldu_memhog_pages++;
-
-               level2p = (struct page **)page_address(*level1p);
-               count2 = 0;
-               memset(level2p, 0, PAGE_CACHE_SIZE);
-
-               while (ldu->ldu_memhog_pages < npages &&
-                      count2 < PAGE_CACHE_SIZE/sizeof(struct page *)) {
-
-                       if (cfs_signal_pending())
-                               return -EINTR;
-
-                       *level2p = alloc_page(flags);
-                       if (*level2p == NULL)
-                               return -ENOMEM;
-                       ldu->ldu_memhog_pages++;
-
-                       level2p++;
-                       count2++;
-               }
-
-               level1p++;
-               count1++;
-       }
-
-       return 0;
-}
-
 /* called when opening /dev/device */
 static int libcfs_psdev_open(unsigned long flags, void *args)
 {
-       struct libcfs_device_userstate *ldu;
-
        try_module_get(THIS_MODULE);
-
-       LIBCFS_ALLOC(ldu, sizeof(*ldu));
-       if (ldu != NULL) {
-               ldu->ldu_memhog_pages = 0;
-               ldu->ldu_memhog_root_page = NULL;
-       }
-       *(struct libcfs_device_userstate **)args = ldu;
-
        return 0;
 }
 
 /* called when closing /dev/device */
 static int libcfs_psdev_release(unsigned long flags, void *args)
 {
-       struct libcfs_device_userstate *ldu;
-
-       ldu = (struct libcfs_device_userstate *)args;
-       if (ldu != NULL) {
-               kportal_memhog_free(ldu);
-               LIBCFS_FREE(ldu, sizeof(*ldu));
-       }
-
        module_put(THIS_MODULE);
        return 0;
 }
@@ -260,19 +134,6 @@ static int libcfs_ioctl_int(struct cfs_psdev_file *pfile, unsigned long cmd,
                        return -EINVAL;
                libcfs_debug_mark_buffer(data->ioc_inlbuf1);
                return 0;
-       case IOC_LIBCFS_MEMHOG:
-               if (pfile->private_data == NULL) {
-                       err = -EINVAL;
-               } else {
-                       kportal_memhog_free(pfile->private_data);
-                       /* XXX The ioc_flags is not GFP flags now, need to be fixed */
-                       err = kportal_memhog_alloc(pfile->private_data,
-                                                  data->ioc_count,
-                                                  data->ioc_flags);
-                       if (err != 0)
-                               kportal_memhog_free(pfile->private_data);
-               }
-               break;
 
        default: {
                struct libcfs_ioctl_handler *hand;