Messages in this thread Patch in this message | | | Subject | [PATCH 24/28] sys_mknodat(): elevate write count for vfs_mknod/create() | From | Dave Hansen <> | Date | Tue, 01 Aug 2006 16:52:58 -0700 |
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This takes care of all of the direct callers of vfs_mknod(). Since a few of these cases also handle normal file creation as well, this also covers some calls to vfs_create().
Signed-off-by: Dave Hansen <haveblue@us.ibm.com> ---
lxc-dave/fs/namei.c | 12 ++++++++++++ lxc-dave/fs/nfsd/vfs.c | 4 ++++ lxc-dave/net/unix/af_unix.c | 4 ++++ 3 files changed, 20 insertions(+)
diff -puN fs/namei.c~C-elevate-writers-vfs_mknod-try2 fs/namei.c --- lxc/fs/namei.c~C-elevate-writers-vfs_mknod-try2 2006-08-01 16:35:28.000000000 -0700 +++ lxc-dave/fs/namei.c 2006-08-01 16:35:31.000000000 -0700 @@ -1892,14 +1892,26 @@ asmlinkage long sys_mknodat(int dfd, con if (!IS_ERR(dentry)) { switch (mode & S_IFMT) { case 0: case S_IFREG: + error = mnt_want_write(nd.mnt); + if (error) + break; error = vfs_create(nd.dentry->d_inode,dentry,mode,&nd); + mnt_drop_write(nd.mnt); break; case S_IFCHR: case S_IFBLK: + error = mnt_want_write(nd.mnt); + if (error) + break; error = vfs_mknod(nd.dentry->d_inode,dentry,mode, new_decode_dev(dev)); + mnt_drop_write(nd.mnt); break; case S_IFIFO: case S_IFSOCK: + error = mnt_want_write(nd.mnt); + if (error) + break; error = vfs_mknod(nd.dentry->d_inode,dentry,mode,0); + mnt_drop_write(nd.mnt); break; case S_IFDIR: error = -EPERM; diff -puN fs/nfsd/vfs.c~C-elevate-writers-vfs_mknod-try2 fs/nfsd/vfs.c --- lxc/fs/nfsd/vfs.c~C-elevate-writers-vfs_mknod-try2 2006-08-01 16:35:27.000000000 -0700 +++ lxc-dave/fs/nfsd/vfs.c 2006-08-01 16:35:31.000000000 -0700 @@ -1155,6 +1155,9 @@ nfsd_create(struct svc_rqst *rqstp, stru /* * Get the dir op function pointer. */ + err = mnt_want_write(fhp->fh_export->ex_mnt); + if (err) + goto out_nfserr; err = nfserr_perm; switch (type) { case S_IFREG: @@ -1173,6 +1176,7 @@ nfsd_create(struct svc_rqst *rqstp, stru printk("nfsd: bad file type %o in nfsd_create\n", type); err = -EINVAL; } + mnt_drop_write(fhp->fh_export->ex_mnt); if (err < 0) goto out_nfserr; diff -puN net/unix/af_unix.c~C-elevate-writers-vfs_mknod-try2 net/unix/af_unix.c --- lxc/net/unix/af_unix.c~C-elevate-writers-vfs_mknod-try2 2006-08-01 16:35:27.000000000 -0700 +++ lxc-dave/net/unix/af_unix.c 2006-08-01 16:35:31.000000000 -0700 @@ -821,7 +821,11 @@ static int unix_bind(struct socket *sock */ mode = S_IFSOCK | (SOCK_INODE(sock)->i_mode & ~current->fs->umask); + err = mnt_want_write(nd.mnt); + if (err) + goto out_mknod_dput; err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0); + mnt_drop_write(nd.mnt); if (err) goto out_mknod_dput; mutex_unlock(&nd.dentry->d_inode->i_mutex); _ - 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/
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