diff options
Diffstat (limited to 'fs/kernfs')
| -rw-r--r-- | fs/kernfs/dir.c | 8 | ||||
| -rw-r--r-- | fs/kernfs/file.c | 51 | ||||
| -rw-r--r-- | fs/kernfs/inode.c | 15 |
3 files changed, 44 insertions, 30 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index 68a44315d949..8a652404eef6 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -753,7 +753,8 @@ int kernfs_add_one(struct kernfs_node *kn) ps_iattr = parent->iattr; if (ps_iattr) { struct iattr *ps_iattrs = &ps_iattr->ia_iattr; - ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; + ktime_get_real_ts(&ps_iattrs->ia_ctime); + ps_iattrs->ia_mtime = ps_iattrs->ia_ctime; } mutex_unlock(&kernfs_mutex); @@ -1279,8 +1280,9 @@ static void __kernfs_remove(struct kernfs_node *kn) /* update timestamps on the parent */ if (ps_iattr) { - ps_iattr->ia_iattr.ia_ctime = CURRENT_TIME; - ps_iattr->ia_iattr.ia_mtime = CURRENT_TIME; + ktime_get_real_ts(&ps_iattr->ia_iattr.ia_ctime); + ps_iattr->ia_iattr.ia_mtime = + ps_iattr->ia_iattr.ia_ctime; } kernfs_put(pos); diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c index 7247252ee9b1..e1574008adc9 100644 --- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -190,15 +190,16 @@ static ssize_t kernfs_file_direct_read(struct kernfs_open_file *of, char *buf; buf = of->prealloc_buf; - if (!buf) + if (buf) + mutex_lock(&of->prealloc_mutex); + else buf = kmalloc(len, GFP_KERNEL); if (!buf) return -ENOMEM; /* * @of->mutex nests outside active ref and is used both to ensure that - * the ops aren't called concurrently for the same open file, and - * to provide exclusive access to ->prealloc_buf (when that exists). + * the ops aren't called concurrently for the same open file. */ mutex_lock(&of->mutex); if (!kernfs_get_active(of->kn)) { @@ -214,21 +215,23 @@ static ssize_t kernfs_file_direct_read(struct kernfs_open_file *of, else len = -EINVAL; + kernfs_put_active(of->kn); + mutex_unlock(&of->mutex); + if (len < 0) - goto out_unlock; + goto out_free; if (copy_to_user(user_buf, buf, len)) { len = -EFAULT; - goto out_unlock; + goto out_free; } *ppos += len; - out_unlock: - kernfs_put_active(of->kn); - mutex_unlock(&of->mutex); out_free: - if (buf != of->prealloc_buf) + if (buf == of->prealloc_buf) + mutex_unlock(&of->prealloc_mutex); + else kfree(buf); return len; } @@ -284,15 +287,22 @@ static ssize_t kernfs_fop_write(struct file *file, const char __user *user_buf, } buf = of->prealloc_buf; - if (!buf) + if (buf) + mutex_lock(&of->prealloc_mutex); + else buf = kmalloc(len + 1, GFP_KERNEL); if (!buf) return -ENOMEM; + if (copy_from_user(buf, user_buf, len)) { + len = -EFAULT; + goto out_free; + } + buf[len] = '\0'; /* guarantee string termination */ + /* * @of->mutex nests outside active ref and is used both to ensure that - * the ops aren't called concurrently for the same open file, and - * to provide exclusive access to ->prealloc_buf (when that exists). + * the ops aren't called concurrently for the same open file. */ mutex_lock(&of->mutex); if (!kernfs_get_active(of->kn)) { @@ -301,26 +311,22 @@ static ssize_t kernfs_fop_write(struct file *file, const char __user *user_buf, goto out_free; } - if (copy_from_user(buf, user_buf, len)) { - len = -EFAULT; - goto out_unlock; - } - buf[len] = '\0'; /* guarantee string termination */ - ops = kernfs_ops(of->kn); if (ops->write) len = ops->write(of, buf, len, *ppos); else len = -EINVAL; + kernfs_put_active(of->kn); + mutex_unlock(&of->mutex); + if (len > 0) *ppos += len; -out_unlock: - kernfs_put_active(of->kn); - mutex_unlock(&of->mutex); out_free: - if (buf != of->prealloc_buf) + if (buf == of->prealloc_buf) + mutex_unlock(&of->prealloc_mutex); + else kfree(buf); return len; } @@ -687,6 +693,7 @@ static int kernfs_fop_open(struct inode *inode, struct file *file) error = -ENOMEM; if (!of->prealloc_buf) goto err_free; + mutex_init(&of->prealloc_mutex); } /* diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c index b5247226732b..1719649d7ad7 100644 --- a/fs/kernfs/inode.c +++ b/fs/kernfs/inode.c @@ -54,7 +54,10 @@ static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn) iattrs->ia_mode = kn->mode; iattrs->ia_uid = GLOBAL_ROOT_UID; iattrs->ia_gid = GLOBAL_ROOT_GID; - iattrs->ia_atime = iattrs->ia_mtime = iattrs->ia_ctime = CURRENT_TIME; + + ktime_get_real_ts(&iattrs->ia_atime); + iattrs->ia_mtime = iattrs->ia_atime; + iattrs->ia_ctime = iattrs->ia_atime; simple_xattrs_init(&kn->iattr->xattrs); out_unlock: @@ -236,16 +239,18 @@ ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size) static inline void set_default_inode_attr(struct inode *inode, umode_t mode) { inode->i_mode = mode; - inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; + inode->i_atime = inode->i_mtime = + inode->i_ctime = current_fs_time(inode->i_sb); } static inline void set_inode_attr(struct inode *inode, struct iattr *iattr) { + struct super_block *sb = inode->i_sb; inode->i_uid = iattr->ia_uid; inode->i_gid = iattr->ia_gid; - inode->i_atime = iattr->ia_atime; - inode->i_mtime = iattr->ia_mtime; - inode->i_ctime = iattr->ia_ctime; + inode->i_atime = timespec_trunc(iattr->ia_atime, sb->s_time_gran); + inode->i_mtime = timespec_trunc(iattr->ia_mtime, sb->s_time_gran); + inode->i_ctime = timespec_trunc(iattr->ia_ctime, sb->s_time_gran); } static void kernfs_refresh_inode(struct kernfs_node *kn, struct inode *inode) |