diff options
Diffstat (limited to 'fs/sysfs/inode.c')
| -rw-r--r-- | fs/sysfs/inode.c | 226 |
1 files changed, 0 insertions, 226 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c deleted file mode 100644 index 3756e152285..00000000000 --- a/fs/sysfs/inode.c +++ /dev/null @@ -1,226 +0,0 @@ -/* - * inode.c - basic inode and dentry operations. - * - * sysfs is Copyright (c) 2001-3 Patrick Mochel - * - * Please see Documentation/filesystems/sysfs.txt for more information. - */ - -#undef DEBUG - -#include <linux/pagemap.h> -#include <linux/namei.h> -#include <linux/backing-dev.h> -#include <linux/capability.h> -#include <linux/errno.h> -#include <linux/sched.h> -#include <asm/semaphore.h> -#include "sysfs.h" - -extern struct super_block * sysfs_sb; - -static const struct address_space_operations sysfs_aops = { - .readpage = simple_readpage, - .prepare_write = simple_prepare_write, - .commit_write = simple_commit_write -}; - -static struct backing_dev_info sysfs_backing_dev_info = { - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK, -}; - -static const struct inode_operations sysfs_inode_operations ={ - .setattr = sysfs_setattr, -}; - -void sysfs_delete_inode(struct inode *inode) -{ - /* Free the shadowed directory inode operations */ - if (sysfs_is_shadowed_inode(inode)) { - kfree(inode->i_op); - inode->i_op = NULL; - } - return generic_delete_inode(inode); -} - -int sysfs_setattr(struct dentry * dentry, struct iattr * iattr) -{ - struct inode * inode = dentry->d_inode; - struct sysfs_dirent * sd = dentry->d_fsdata; - struct iattr * sd_iattr; - unsigned int ia_valid = iattr->ia_valid; - int error; - - if (!sd) - return -EINVAL; - - sd_iattr = sd->s_iattr; - - error = inode_change_ok(inode, iattr); - if (error) - return error; - - error = inode_setattr(inode, iattr); - if (error) - return error; - - if (!sd_iattr) { - /* setting attributes for the first time, allocate now */ - sd_iattr = kzalloc(sizeof(struct iattr), GFP_KERNEL); - if (!sd_iattr) - return -ENOMEM; - /* assign default attributes */ - sd_iattr->ia_mode = sd->s_mode; - sd_iattr->ia_uid = 0; - sd_iattr->ia_gid = 0; - sd_iattr->ia_atime = sd_iattr->ia_mtime = sd_iattr->ia_ctime = CURRENT_TIME; - sd->s_iattr = sd_iattr; - } - - /* attributes were changed atleast once in past */ - - if (ia_valid & ATTR_UID) - sd_iattr->ia_uid = iattr->ia_uid; - if (ia_valid & ATTR_GID) - sd_iattr->ia_gid = iattr->ia_gid; - if (ia_valid & ATTR_ATIME) - sd_iattr->ia_atime = timespec_trunc(iattr->ia_atime, - inode->i_sb->s_time_gran); - if (ia_valid & ATTR_MTIME) - sd_iattr->ia_mtime = timespec_trunc(iattr->ia_mtime, - inode->i_sb->s_time_gran); - if (ia_valid & ATTR_CTIME) - sd_iattr->ia_ctime = timespec_trunc(iattr->ia_ctime, - inode->i_sb->s_time_gran); - if (ia_valid & ATTR_MODE) { - umode_t mode = iattr->ia_mode; - - if (!in_group_p(inode->i_gid) && !capable(CAP_FSETID)) - mode &= ~S_ISGID; - sd_iattr->ia_mode = sd->s_mode = mode; - } - - return error; -} - -static inline void set_default_inode_attr(struct inode * inode, mode_t mode) -{ - inode->i_mode = mode; - inode->i_uid = 0; - inode->i_gid = 0; - inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; -} - -static inline void set_inode_attr(struct inode * inode, struct iattr * iattr) -{ - inode->i_mode = iattr->ia_mode; - 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; -} - - -/* - * sysfs has a different i_mutex lock order behavior for i_mutex than other - * filesystems; sysfs i_mutex is called in many places with subsystem locks - * held. At the same time, many of the VFS locking rules do not apply to - * sysfs at all (cross directory rename for example). To untangle this mess - * (which gives false positives in lockdep), we're giving sysfs inodes their - * own class for i_mutex. - */ -static struct lock_class_key sysfs_inode_imutex_key; - -void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode) -{ - inode->i_blocks = 0; - inode->i_mapping->a_ops = &sysfs_aops; - inode->i_mapping->backing_dev_info = &sysfs_backing_dev_info; - inode->i_op = &sysfs_inode_operations; - inode->i_ino = sd->s_ino; - lockdep_set_class(&inode->i_mutex, &sysfs_inode_imutex_key); - - if (sd->s_iattr) { - /* sysfs_dirent has non-default attributes - * get them for the new inode from persistent copy - * in sysfs_dirent - */ - set_inode_attr(inode, sd->s_iattr); - } else - set_default_inode_attr(inode, sd->s_mode); -} - -/** - * sysfs_get_inode - get inode for sysfs_dirent - * @sd: sysfs_dirent to allocate inode for - * - * Get inode for @sd. If such inode doesn't exist, a new inode - * is allocated and basics are initialized. New inode is - * returned locked. - * - * LOCKING: - * Kernel thread context (may sleep). - * - * RETURNS: - * Pointer to allocated inode on success, NULL on failure. - */ -struct inode * sysfs_get_inode(struct sysfs_dirent *sd) -{ - struct inode *inode; - - inode = iget_locked(sysfs_sb, sd->s_ino); - if (inode && (inode->i_state & I_NEW)) - sysfs_init_inode(sd, inode); - - return inode; -} - -/** - * sysfs_instantiate - instantiate dentry - * @dentry: dentry to be instantiated - * @inode: inode associated with @sd - * - * Unlock @inode if locked and instantiate @dentry with @inode. - * - * LOCKING: - * None. - */ -void sysfs_instantiate(struct dentry *dentry, struct inode *inode) -{ - BUG_ON(!dentry || dentry->d_inode); - - if (inode->i_state & I_NEW) - unlock_new_inode(inode); - - d_instantiate(dentry, inode); -} - -int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name) -{ - struct sysfs_addrm_cxt acxt; - struct sysfs_dirent **pos, *sd; - - if (!dir_sd) - return -ENOENT; - - sysfs_addrm_start(&acxt, dir_sd); - - for (pos = &dir_sd->s_children; *pos; pos = &(*pos)->s_sibling) { - sd = *pos; - - if (!sysfs_type(sd)) - continue; - if (!strcmp(sd->s_name, name)) { - *pos = sd->s_sibling; - sd->s_sibling = NULL; - sysfs_remove_one(&acxt, sd); - break; - } - } - - if (sysfs_addrm_finish(&acxt)) - return 0; - return -ENOENT; -} |