inode.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:17k
- /*
- * inode.c
- *
- * Copyright (C) 1995, 1996 by Paal-Kr. Engstad and Volker Lendecke
- * Copyright (C) 1997 by Volker Lendecke
- *
- * Please add a note about your changes to smbfs in the ChangeLog file.
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/sched.h>
- #include <linux/kernel.h>
- #include <linux/mm.h>
- #include <linux/string.h>
- #include <linux/stat.h>
- #include <linux/errno.h>
- #include <linux/locks.h>
- #include <linux/slab.h>
- #include <linux/init.h>
- #include <linux/file.h>
- #include <linux/dcache.h>
- #include <linux/smp_lock.h>
- #include <linux/nls.h>
- #include <linux/seq_file.h>
- #include <linux/smb_fs.h>
- #include <linux/smbno.h>
- #include <linux/smb_mount.h>
- #include <asm/system.h>
- #include <asm/uaccess.h>
- #include "smb_debug.h"
- #include "getopt.h"
- #include "proto.h"
- /* Always pick a default string */
- #ifdef CONFIG_SMB_NLS_REMOTE
- #define SMB_NLS_REMOTE CONFIG_SMB_NLS_REMOTE
- #else
- #define SMB_NLS_REMOTE ""
- #endif
- #define SMB_TTL_DEFAULT 1000
- #define SMB_TIMEO_DEFAULT 30
- static void smb_delete_inode(struct inode *);
- static void smb_put_super(struct super_block *);
- static int smb_statfs(struct super_block *, struct statfs *);
- static int smb_show_options(struct seq_file *, struct vfsmount *);
- static struct super_operations smb_sops =
- {
- put_inode: force_delete,
- delete_inode: smb_delete_inode,
- put_super: smb_put_super,
- statfs: smb_statfs,
- show_options: smb_show_options,
- };
- /* We are always generating a new inode here */
- struct inode *
- smb_iget(struct super_block *sb, struct smb_fattr *fattr)
- {
- struct inode *result;
- DEBUG1("smb_iget: %pn", fattr);
- result = new_inode(sb);
- if (!result)
- return result;
- result->i_ino = fattr->f_ino;
- memset(&(result->u.smbfs_i), 0, sizeof(result->u.smbfs_i));
- smb_set_inode_attr(result, fattr);
- if (S_ISREG(result->i_mode)) {
- result->i_op = &smb_file_inode_operations;
- result->i_fop = &smb_file_operations;
- result->i_data.a_ops = &smb_file_aops;
- } else if (S_ISDIR(result->i_mode)) {
- result->i_op = &smb_dir_inode_operations;
- result->i_fop = &smb_dir_operations;
- }
- insert_inode_hash(result);
- return result;
- }
- /*
- * Copy the inode data to a smb_fattr structure.
- */
- void
- smb_get_inode_attr(struct inode *inode, struct smb_fattr *fattr)
- {
- memset(fattr, 0, sizeof(struct smb_fattr));
- fattr->f_mode = inode->i_mode;
- fattr->f_nlink = inode->i_nlink;
- fattr->f_ino = inode->i_ino;
- fattr->f_uid = inode->i_uid;
- fattr->f_gid = inode->i_gid;
- fattr->f_rdev = inode->i_rdev;
- fattr->f_size = inode->i_size;
- fattr->f_mtime = inode->i_mtime;
- fattr->f_ctime = inode->i_ctime;
- fattr->f_atime = inode->i_atime;
- fattr->f_blksize= inode->i_blksize;
- fattr->f_blocks = inode->i_blocks;
- fattr->attr = inode->u.smbfs_i.attr;
- /*
- * Keep the attributes in sync with the inode permissions.
- */
- if (fattr->f_mode & S_IWUSR)
- fattr->attr &= ~aRONLY;
- else
- fattr->attr |= aRONLY;
- }
- /*
- * Update the inode, possibly causing it to invalidate its pages if mtime/size
- * is different from last time.
- */
- void
- smb_set_inode_attr(struct inode *inode, struct smb_fattr *fattr)
- {
- /*
- * A size change should have a different mtime, or same mtime
- * but different size.
- */
- time_t last_time = inode->i_mtime;
- loff_t last_sz = inode->i_size;
- inode->i_mode = fattr->f_mode;
- inode->i_nlink = fattr->f_nlink;
- inode->i_uid = fattr->f_uid;
- inode->i_gid = fattr->f_gid;
- inode->i_rdev = fattr->f_rdev;
- inode->i_ctime = fattr->f_ctime;
- inode->i_blksize= fattr->f_blksize;
- inode->i_blocks = fattr->f_blocks;
- inode->i_size = fattr->f_size;
- inode->i_mtime = fattr->f_mtime;
- inode->i_atime = fattr->f_atime;
- inode->u.smbfs_i.attr = fattr->attr;
- /*
- * Update the "last time refreshed" field for revalidation.
- */
- inode->u.smbfs_i.oldmtime = jiffies;
- if (inode->i_mtime != last_time || inode->i_size != last_sz) {
- VERBOSE("%ld changed, old=%ld, new=%ld, oz=%ld, nz=%ldn",
- inode->i_ino,
- (long) last_time, (long) inode->i_mtime,
- (long) last_sz, (long) inode->i_size);
- if (!S_ISDIR(inode->i_mode))
- invalidate_inode_pages(inode);
- }
- }
- /*
- * This is called if the connection has gone bad ...
- * try to kill off all the current inodes.
- */
- void
- smb_invalidate_inodes(struct smb_sb_info *server)
- {
- VERBOSE("n");
- shrink_dcache_sb(SB_of(server));
- invalidate_inodes(SB_of(server));
- }
- /*
- * This is called to update the inode attributes after
- * we've made changes to a file or directory.
- */
- static int
- smb_refresh_inode(struct dentry *dentry)
- {
- struct inode *inode = dentry->d_inode;
- int error;
- struct smb_fattr fattr;
- error = smb_proc_getattr(dentry, &fattr);
- if (!error) {
- smb_renew_times(dentry);
- /*
- * Check whether the type part of the mode changed,
- * and don't update the attributes if it did.
- */
- if ((inode->i_mode & S_IFMT) == (fattr.f_mode & S_IFMT)) {
- smb_set_inode_attr(inode, &fattr);
- } else {
- /*
- * Big trouble! The inode has become a new object,
- * so any operations attempted on it are invalid.
- *
- * To limit damage, mark the inode as bad so that
- * subsequent lookup validations will fail.
- */
- PARANOIA("%s/%s changed mode, %07o to %07on",
- DENTRY_PATH(dentry),
- inode->i_mode, fattr.f_mode);
- fattr.f_mode = inode->i_mode; /* save mode */
- make_bad_inode(inode);
- inode->i_mode = fattr.f_mode; /* restore mode */
- /*
- * No need to worry about unhashing the dentry: the
- * lookup validation will see that the inode is bad.
- * But we do want to invalidate the caches ...
- */
- if (!S_ISDIR(inode->i_mode))
- invalidate_inode_pages(inode);
- else
- smb_invalid_dir_cache(inode);
- error = -EIO;
- }
- }
- return error;
- }
- /*
- * This is called when we want to check whether the inode
- * has changed on the server. If it has changed, we must
- * invalidate our local caches.
- */
- int
- smb_revalidate_inode(struct dentry *dentry)
- {
- struct smb_sb_info *s = server_from_dentry(dentry);
- struct inode *inode = dentry->d_inode;
- int error = 0;
- DEBUG1("smb_revalidate_inoden");
- lock_kernel();
- /*
- * Check whether we've recently refreshed the inode.
- */
- if (time_before(jiffies, inode->u.smbfs_i.oldmtime + SMB_MAX_AGE(s))) {
- VERBOSE("up-to-date, ino=%ld, jiffies=%lu, oldtime=%lun",
- inode->i_ino, jiffies, inode->u.smbfs_i.oldmtime);
- goto out;
- }
- error = smb_refresh_inode(dentry);
- out:
- unlock_kernel();
- return error;
- }
- /*
- * This routine is called when i_nlink == 0 and i_count goes to 0.
- * All blocking cleanup operations need to go here to avoid races.
- */
- static void
- smb_delete_inode(struct inode *ino)
- {
- DEBUG1("ino=%ldn", ino->i_ino);
- lock_kernel();
- if (smb_close(ino))
- PARANOIA("could not close inode %ldn", ino->i_ino);
- unlock_kernel();
- clear_inode(ino);
- }
- static struct option opts[] = {
- { "version", 0, 'v' },
- { "win95", SMB_MOUNT_WIN95, 1 },
- { "oldattr", SMB_MOUNT_OLDATTR, 1 },
- { "dirattr", SMB_MOUNT_DIRATTR, 1 },
- { "case", SMB_MOUNT_CASE, 1 },
- { "uid", 0, 'u' },
- { "gid", 0, 'g' },
- { "file_mode", 0, 'f' },
- { "dir_mode", 0, 'd' },
- { "iocharset", 0, 'i' },
- { "codepage", 0, 'c' },
- { "ttl", 0, 't' },
- { "timeo", 0, 'o' },
- { NULL, 0, 0}
- };
- static int
- parse_options(struct smb_mount_data_kernel *mnt, char *options)
- {
- int c;
- unsigned long flags;
- unsigned long value;
- char *optarg;
- char *optopt;
- flags = 0;
- while ( (c = smb_getopt("smbfs", &options, opts,
- &optopt, &optarg, &flags, &value)) > 0) {
- VERBOSE("'%s' -> '%s'n", optopt, optarg ? optarg : "<none>");
- switch (c) {
- case 1:
- /* got a "flag" option */
- break;
- case 'v':
- if (value != SMB_MOUNT_VERSION) {
- printk ("smbfs: Bad mount version %ld, expected %dn",
- value, SMB_MOUNT_VERSION);
- return 0;
- }
- mnt->version = value;
- break;
- case 'u':
- mnt->uid = value;
- break;
- case 'g':
- mnt->gid = value;
- break;
- case 'f':
- mnt->file_mode = (value & S_IRWXUGO) | S_IFREG;
- break;
- case 'd':
- mnt->dir_mode = (value & S_IRWXUGO) | S_IFDIR;
- break;
- case 'i':
- strncpy(mnt->codepage.local_name, optarg,
- SMB_NLS_MAXNAMELEN);
- break;
- case 'c':
- strncpy(mnt->codepage.remote_name, optarg,
- SMB_NLS_MAXNAMELEN);
- break;
- case 't':
- mnt->ttl = value;
- break;
- case 'o':
- mnt->timeo = value;
- break;
- default:
- printk ("smbfs: Unrecognized mount option %sn",
- optopt);
- return -1;
- }
- }
- mnt->flags = flags;
- return c;
- }
- /*
- * smb_show_options() is for displaying mount options in /proc/mounts.
- * It tries to avoid showing settings that were not changed from their
- * defaults.
- */
- static int
- smb_show_options(struct seq_file *s, struct vfsmount *m)
- {
- struct smb_mount_data_kernel *mnt = m->mnt_sb->u.smbfs_sb.mnt;
- int i;
- for (i = 0; opts[i].name != NULL; i++)
- if (mnt->flags & opts[i].flag)
- seq_printf(s, ",%s", opts[i].name);
- if (mnt->uid != 0)
- seq_printf(s, ",uid=%d", mnt->uid);
- if (mnt->gid != 0)
- seq_printf(s, ",gid=%d", mnt->gid);
- if (mnt->mounted_uid != 0)
- seq_printf(s, ",mounted_uid=%d", mnt->mounted_uid);
- /*
- * Defaults for file_mode and dir_mode are unknown to us; they
- * depend on the current umask of the user doing the mount.
- */
- seq_printf(s, ",file_mode=%04o", mnt->file_mode & S_IRWXUGO);
- seq_printf(s, ",dir_mode=%04o", mnt->dir_mode & S_IRWXUGO);
- if (strcmp(mnt->codepage.local_name, CONFIG_NLS_DEFAULT))
- seq_printf(s, ",iocharset=%s", mnt->codepage.local_name);
- if (strcmp(mnt->codepage.remote_name, SMB_NLS_REMOTE))
- seq_printf(s, ",codepage=%s", mnt->codepage.remote_name);
- if (mnt->ttl != SMB_TTL_DEFAULT)
- seq_printf(s, ",ttl=%d", mnt->ttl);
- if (mnt->timeo != SMB_TIMEO_DEFAULT)
- seq_printf(s, ",timeo=%d", mnt->timeo);
- return 0;
- }
- static void
- smb_put_super(struct super_block *sb)
- {
- struct smb_sb_info *server = &(sb->u.smbfs_sb);
- if (server->sock_file) {
- smb_dont_catch_keepalive(server);
- fput(server->sock_file);
- }
- if (server->conn_pid)
- kill_proc(server->conn_pid, SIGTERM, 1);
- smb_kfree(server->mnt);
- smb_kfree(server->temp_buf);
- if (server->packet)
- smb_vfree(server->packet);
- if (server->remote_nls) {
- unload_nls(server->remote_nls);
- server->remote_nls = NULL;
- }
- if (server->local_nls) {
- unload_nls(server->local_nls);
- server->local_nls = NULL;
- }
- }
- struct super_block *
- smb_read_super(struct super_block *sb, void *raw_data, int silent)
- {
- struct smb_sb_info *server = &sb->u.smbfs_sb;
- struct smb_mount_data_kernel *mnt;
- struct smb_mount_data *oldmnt;
- struct inode *root_inode;
- struct smb_fattr root;
- int ver;
- if (!raw_data)
- goto out_no_data;
- oldmnt = (struct smb_mount_data *) raw_data;
- ver = oldmnt->version;
- if (ver != SMB_MOUNT_OLDVERSION && cpu_to_be32(ver) != SMB_MOUNT_ASCII)
- goto out_wrong_data;
- sb->s_blocksize = 1024; /* Eh... Is this correct? */
- sb->s_blocksize_bits = 10;
- sb->s_magic = SMB_SUPER_MAGIC;
- sb->s_op = &smb_sops;
- server->mnt = NULL;
- server->sock_file = NULL;
- init_MUTEX(&server->sem);
- init_waitqueue_head(&server->wait);
- server->conn_pid = 0;
- server->state = CONN_INVALID; /* no connection yet */
- server->generation = 0;
- server->packet_size = smb_round_length(SMB_INITIAL_PACKET_SIZE);
- server->packet = smb_vmalloc(server->packet_size);
- if (!server->packet)
- goto out_no_mem;
- /* Allocate the global temp buffer */
- server->temp_buf = smb_kmalloc(2*SMB_MAXPATHLEN+20, GFP_KERNEL);
- if (!server->temp_buf)
- goto out_no_temp;
- /* Setup NLS stuff */
- server->remote_nls = NULL;
- server->local_nls = NULL;
- server->name_buf = server->temp_buf + SMB_MAXPATHLEN + 20;
- /* Allocate the mount data structure */
- /* FIXME: merge this with the other malloc and get a whole page? */
- mnt = smb_kmalloc(sizeof(struct smb_mount_data_kernel), GFP_KERNEL);
- if (!mnt)
- goto out_no_mount;
- server->mnt = mnt;
- memset(mnt, 0, sizeof(struct smb_mount_data_kernel));
- strncpy(mnt->codepage.local_name, CONFIG_NLS_DEFAULT,
- SMB_NLS_MAXNAMELEN);
- strncpy(mnt->codepage.remote_name, SMB_NLS_REMOTE,
- SMB_NLS_MAXNAMELEN);
- mnt->ttl = SMB_TTL_DEFAULT;
- mnt->timeo = SMB_TIMEO_DEFAULT;
- if (ver == SMB_MOUNT_OLDVERSION) {
- mnt->version = oldmnt->version;
- /* FIXME: is this enough to convert uid/gid's ? */
- mnt->mounted_uid = oldmnt->mounted_uid;
- mnt->uid = oldmnt->uid;
- mnt->gid = oldmnt->gid;
- mnt->file_mode = (oldmnt->file_mode & S_IRWXUGO) | S_IFREG;
- mnt->dir_mode = (oldmnt->dir_mode & S_IRWXUGO) | S_IFDIR;
- mnt->flags = (oldmnt->file_mode >> 9);
- } else {
- if (parse_options(mnt, raw_data))
- goto out_bad_option;
- mnt->mounted_uid = current->uid;
- }
- smb_setcodepage(server, &mnt->codepage);
- /*
- * Display the enabled options
- * Note: smb_proc_getattr uses these in 2.4 (but was changed in 2.2)
- */
- if (mnt->flags & SMB_MOUNT_OLDATTR)
- printk("SMBFS: Using core getattr (Win 95 speedup)n");
- else if (mnt->flags & SMB_MOUNT_DIRATTR)
- printk("SMBFS: Using dir ff getattrn");
- /*
- * Keep the super block locked while we get the root inode.
- */
- smb_init_root_dirent(server, &root);
- root_inode = smb_iget(sb, &root);
- if (!root_inode)
- goto out_no_root;
- sb->s_root = d_alloc_root(root_inode);
- if (!sb->s_root)
- goto out_no_root;
- smb_new_dentry(sb->s_root);
- return sb;
- out_no_root:
- iput(root_inode);
- out_bad_option:
- smb_kfree(server->mnt);
- out_no_mount:
- smb_kfree(server->temp_buf);
- out_no_temp:
- smb_vfree(server->packet);
- out_no_mem:
- if (!server->mnt)
- printk(KERN_ERR "smb_read_super: allocation failuren");
- goto out_fail;
- out_wrong_data:
- printk(KERN_ERR "smbfs: mount_data version %d is not supportedn", ver);
- goto out_fail;
- out_no_data:
- printk(KERN_ERR "smb_read_super: missing data argumentn");
- out_fail:
- return NULL;
- }
- static int
- smb_statfs(struct super_block *sb, struct statfs *buf)
- {
- int result = smb_proc_dskattr(sb, buf);
- buf->f_type = SMB_SUPER_MAGIC;
- buf->f_namelen = SMB_MAXPATHLEN;
- return result;
- }
- int
- smb_notify_change(struct dentry *dentry, struct iattr *attr)
- {
- struct inode *inode = dentry->d_inode;
- struct smb_sb_info *server = server_from_dentry(dentry);
- unsigned int mask = (S_IFREG | S_IFDIR | S_IRWXUGO);
- int error, changed, refresh = 0;
- struct smb_fattr fattr;
- error = smb_revalidate_inode(dentry);
- if (error)
- goto out;
- if ((error = inode_change_ok(inode, attr)) < 0)
- goto out;
- error = -EPERM;
- if ((attr->ia_valid & ATTR_UID) && (attr->ia_uid != server->mnt->uid))
- goto out;
- if ((attr->ia_valid & ATTR_GID) && (attr->ia_uid != server->mnt->gid))
- goto out;
- if ((attr->ia_valid & ATTR_MODE) && (attr->ia_mode & ~mask))
- goto out;
- if ((attr->ia_valid & ATTR_SIZE) != 0) {
- VERBOSE("changing %s/%s, old size=%ld, new size=%ldn",
- DENTRY_PATH(dentry),
- (long) inode->i_size, (long) attr->ia_size);
- filemap_fdatasync(inode->i_mapping);
- filemap_fdatawait(inode->i_mapping);
- error = smb_open(dentry, O_WRONLY);
- if (error)
- goto out;
- error = smb_proc_trunc(server, inode->u.smbfs_i.fileid,
- attr->ia_size);
- if (error)
- goto out;
- error = vmtruncate(inode, attr->ia_size);
- if (error)
- goto out;
- refresh = 1;
- }
- /*
- * Initialize the fattr and check for changed fields.
- * Note: CTIME under SMB is creation time rather than
- * change time, so we don't attempt to change it.
- */
- smb_get_inode_attr(inode, &fattr);
- changed = 0;
- if ((attr->ia_valid & ATTR_MTIME) != 0) {
- fattr.f_mtime = attr->ia_mtime;
- changed = 1;
- }
- if ((attr->ia_valid & ATTR_ATIME) != 0) {
- fattr.f_atime = attr->ia_atime;
- /* Earlier protocols don't have an access time */
- if (server->opt.protocol >= SMB_PROTOCOL_LANMAN2)
- changed = 1;
- }
- if (changed) {
- error = smb_proc_settime(dentry, &fattr);
- if (error)
- goto out;
- refresh = 1;
- }
- /*
- * Check for mode changes ... we're extremely limited in
- * what can be set for SMB servers: just the read-only bit.
- */
- if ((attr->ia_valid & ATTR_MODE) != 0) {
- VERBOSE("%s/%s mode change, old=%x, new=%xn",
- DENTRY_PATH(dentry), fattr.f_mode, attr->ia_mode);
- changed = 0;
- if (attr->ia_mode & S_IWUSR) {
- if (fattr.attr & aRONLY) {
- fattr.attr &= ~aRONLY;
- changed = 1;
- }
- } else {
- if (!(fattr.attr & aRONLY)) {
- fattr.attr |= aRONLY;
- changed = 1;
- }
- }
- if (changed) {
- error = smb_proc_setattr(dentry, &fattr);
- if (error)
- goto out;
- refresh = 1;
- }
- }
- error = 0;
- out:
- if (refresh)
- smb_refresh_inode(dentry);
- return error;
- }
- #ifdef DEBUG_SMB_MALLOC
- int smb_malloced;
- int smb_current_kmalloced;
- int smb_current_vmalloced;
- #endif
- static DECLARE_FSTYPE( smb_fs_type, "smbfs", smb_read_super, 0);
- static int __init init_smb_fs(void)
- {
- DEBUG1("registering ...n");
- #ifdef DEBUG_SMB_MALLOC
- smb_malloced = 0;
- smb_current_kmalloced = 0;
- smb_current_vmalloced = 0;
- #endif
- return register_filesystem(&smb_fs_type);
- }
- static void __exit exit_smb_fs(void)
- {
- DEBUG1("unregistering ...n");
- unregister_filesystem(&smb_fs_type);
- #ifdef DEBUG_SMB_MALLOC
- printk(KERN_DEBUG "smb_malloced: %dn", smb_malloced);
- printk(KERN_DEBUG "smb_current_kmalloced: %dn",smb_current_kmalloced);
- printk(KERN_DEBUG "smb_current_vmalloced: %dn",smb_current_vmalloced);
- #endif
- }
- EXPORT_NO_SYMBOLS;
- module_init(init_smb_fs)
- module_exit(exit_smb_fs)
- MODULE_LICENSE("GPL");