Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754067Ab3J3LbZ (ORCPT ); Wed, 30 Oct 2013 07:31:25 -0400 Received: from mail-pa0-f42.google.com ([209.85.220.42]:51799 "EHLO mail-pa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753614Ab3J3La5 (ORCPT ); Wed, 30 Oct 2013 07:30:57 -0400 From: Peng Tao To: Greg Kroah-Hartman Cc: linux-kernel@vger.kernel.org, Peng Tao , Andreas Dilger Subject: [PATCH 3/4] staging/lustre: remove cfs_get_environ and cfs_access_process_vm Date: Wed, 30 Oct 2013 19:30:35 +0800 Message-Id: <1383132636-8952-3-git-send-email-bergwolf@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1383132636-8952-1-git-send-email-bergwolf@gmail.com> References: <1383132636-8952-1-git-send-email-bergwolf@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5346 Lines: 189 Reviewed-by: Niu Yawei Signed-off-by: Peng Tao Signed-off-by: Andreas Dilger --- .../staging/lustre/include/linux/libcfs/curproc.h | 1 - .../lustre/lustre/libcfs/linux/linux-curproc.c | 150 -------------------- 2 files changed, 151 deletions(-) diff --git a/drivers/staging/lustre/include/linux/libcfs/curproc.h b/drivers/staging/lustre/include/linux/libcfs/curproc.h index de8e35b..1c49ef4 100644 --- a/drivers/staging/lustre/include/linux/libcfs/curproc.h +++ b/drivers/staging/lustre/include/linux/libcfs/curproc.h @@ -64,7 +64,6 @@ int cfs_curproc_groups_nr(void); int current_is_32bit(void); #define current_pid() (current->pid) #define current_comm() (current->comm) -int cfs_get_environ(const char *key, char *value, int *val_len); typedef __u32 cfs_cap_t; diff --git a/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c b/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c index ea9e949..007f197 100644 --- a/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c +++ b/drivers/staging/lustre/lustre/libcfs/linux/linux-curproc.c @@ -152,156 +152,6 @@ int current_is_32bit(void) return is_compat_task(); } -static int cfs_access_process_vm(struct task_struct *tsk, unsigned long addr, - void *buf, int len, int write) -{ - /* Just copied from kernel for the kernels which doesn't - * have access_process_vm() exported */ - struct mm_struct *mm; - struct vm_area_struct *vma; - struct page *page; - void *old_buf = buf; - - mm = get_task_mm(tsk); - if (!mm) - return 0; - - down_read(&mm->mmap_sem); - /* ignore errors, just check how much was sucessfully transfered */ - while (len) { - int bytes, rc, offset; - void *maddr; - - rc = get_user_pages(tsk, mm, addr, 1, - write, 1, &page, &vma); - if (rc <= 0) - break; - - bytes = len; - offset = addr & (PAGE_SIZE-1); - if (bytes > PAGE_SIZE-offset) - bytes = PAGE_SIZE-offset; - - maddr = kmap(page); - if (write) { - copy_to_user_page(vma, page, addr, - maddr + offset, buf, bytes); - set_page_dirty_lock(page); - } else { - copy_from_user_page(vma, page, addr, - buf, maddr + offset, bytes); - } - kunmap(page); - page_cache_release(page); - len -= bytes; - buf += bytes; - addr += bytes; - } - up_read(&mm->mmap_sem); - mmput(mm); - - return buf - old_buf; -} - -/* Read the environment variable of current process specified by @key. */ -int cfs_get_environ(const char *key, char *value, int *val_len) -{ - struct mm_struct *mm; - char *buffer, *tmp_buf = NULL; - int buf_len = PAGE_CACHE_SIZE; - int key_len = strlen(key); - unsigned long addr; - int rc; - - buffer = kmalloc(buf_len, GFP_USER); - if (!buffer) - return -ENOMEM; - - mm = get_task_mm(current); - if (!mm) { - kfree(buffer); - return -EINVAL; - } - - /* Avoid deadlocks on mmap_sem if called from sys_mmap_pgoff(), - * which is already holding mmap_sem for writes. If some other - * thread gets the write lock in the meantime, this thread will - * block, but at least it won't deadlock on itself. LU-1735 */ - if (down_read_trylock(&mm->mmap_sem) == 0) - return -EDEADLK; - up_read(&mm->mmap_sem); - - addr = mm->env_start; - while (addr < mm->env_end) { - int this_len, retval, scan_len; - char *env_start, *env_end; - - memset(buffer, 0, buf_len); - - this_len = min_t(int, mm->env_end - addr, buf_len); - retval = cfs_access_process_vm(current, addr, buffer, - this_len, 0); - if (retval != this_len) - break; - - addr += retval; - - /* Parse the buffer to find out the specified key/value pair. - * The "key=value" entries are separated by '\0'. */ - env_start = buffer; - scan_len = this_len; - while (scan_len) { - char *entry; - int entry_len; - - env_end = memscan(env_start, '\0', scan_len); - LASSERT(env_end >= env_start && - env_end <= env_start + scan_len); - - /* The last entry of this buffer cross the buffer - * boundary, reread it in next cycle. */ - if (unlikely(env_end - env_start == scan_len)) { - /* This entry is too large to fit in buffer */ - if (unlikely(scan_len == this_len)) { - CERROR("Too long env variable.\n"); - GOTO(out, rc = -EINVAL); - } - addr -= scan_len; - break; - } - - entry = env_start; - entry_len = env_end - env_start; - - /* Key length + length of '=' */ - if (entry_len > key_len + 1 && - !memcmp(entry, key, key_len)) { - entry += key_len + 1; - entry_len -= key_len + 1; - /* The 'value' buffer passed in is too small.*/ - if (entry_len >= *val_len) - GOTO(out, rc = -EOVERFLOW); - - memcpy(value, entry, entry_len); - *val_len = entry_len; - GOTO(out, rc = 0); - } - - scan_len -= (env_end - env_start + 1); - env_start = env_end + 1; - } - } - GOTO(out, rc = -ENOENT); - -out: - mmput(mm); - kfree((void *)buffer); - if (tmp_buf) - kfree((void *)tmp_buf); - return rc; -} -EXPORT_SYMBOL(cfs_get_environ); - EXPORT_SYMBOL(cfs_curproc_groups_nr); EXPORT_SYMBOL(cfs_cap_raise); EXPORT_SYMBOL(cfs_cap_lower); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/