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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/smbfs/dir.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/smbfs/dir.c')
-rw-r--r-- | fs/smbfs/dir.c | 693 |
1 files changed, 693 insertions, 0 deletions
diff --git a/fs/smbfs/dir.c b/fs/smbfs/dir.c new file mode 100644 index 0000000..c6c33e1 --- /dev/null +++ b/fs/smbfs/dir.c @@ -0,0 +1,693 @@ +/* + * dir.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/time.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/smp_lock.h> +#include <linux/ctype.h> +#include <linux/net.h> + +#include <linux/smb_fs.h> +#include <linux/smb_mount.h> +#include <linux/smbno.h> + +#include "smb_debug.h" +#include "proto.h" + +static int smb_readdir(struct file *, void *, filldir_t); +static int smb_dir_open(struct inode *, struct file *); + +static struct dentry *smb_lookup(struct inode *, struct dentry *, struct nameidata *); +static int smb_create(struct inode *, struct dentry *, int, struct nameidata *); +static int smb_mkdir(struct inode *, struct dentry *, int); +static int smb_rmdir(struct inode *, struct dentry *); +static int smb_unlink(struct inode *, struct dentry *); +static int smb_rename(struct inode *, struct dentry *, + struct inode *, struct dentry *); +static int smb_make_node(struct inode *,struct dentry *,int,dev_t); +static int smb_link(struct dentry *, struct inode *, struct dentry *); + +struct file_operations smb_dir_operations = +{ + .read = generic_read_dir, + .readdir = smb_readdir, + .ioctl = smb_ioctl, + .open = smb_dir_open, +}; + +struct inode_operations smb_dir_inode_operations = +{ + .create = smb_create, + .lookup = smb_lookup, + .unlink = smb_unlink, + .mkdir = smb_mkdir, + .rmdir = smb_rmdir, + .rename = smb_rename, + .getattr = smb_getattr, + .setattr = smb_notify_change, +}; + +struct inode_operations smb_dir_inode_operations_unix = +{ + .create = smb_create, + .lookup = smb_lookup, + .unlink = smb_unlink, + .mkdir = smb_mkdir, + .rmdir = smb_rmdir, + .rename = smb_rename, + .getattr = smb_getattr, + .setattr = smb_notify_change, + .symlink = smb_symlink, + .mknod = smb_make_node, + .link = smb_link, +}; + +/* + * Read a directory, using filldir to fill the dirent memory. + * smb_proc_readdir does the actual reading from the smb server. + * + * The cache code is almost directly taken from ncpfs + */ +static int +smb_readdir(struct file *filp, void *dirent, filldir_t filldir) +{ + struct dentry *dentry = filp->f_dentry; + struct inode *dir = dentry->d_inode; + struct smb_sb_info *server = server_from_dentry(dentry); + union smb_dir_cache *cache = NULL; + struct smb_cache_control ctl; + struct page *page = NULL; + int result; + + ctl.page = NULL; + ctl.cache = NULL; + + VERBOSE("reading %s/%s, f_pos=%d\n", + DENTRY_PATH(dentry), (int) filp->f_pos); + + result = 0; + + lock_kernel(); + + switch ((unsigned int) filp->f_pos) { + case 0: + if (filldir(dirent, ".", 1, 0, dir->i_ino, DT_DIR) < 0) + goto out; + filp->f_pos = 1; + /* fallthrough */ + case 1: + if (filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR) < 0) + goto out; + filp->f_pos = 2; + } + + /* + * Make sure our inode is up-to-date. + */ + result = smb_revalidate_inode(dentry); + if (result) + goto out; + + + page = grab_cache_page(&dir->i_data, 0); + if (!page) + goto read_really; + + ctl.cache = cache = kmap(page); + ctl.head = cache->head; + + if (!PageUptodate(page) || !ctl.head.eof) { + VERBOSE("%s/%s, page uptodate=%d, eof=%d\n", + DENTRY_PATH(dentry), PageUptodate(page),ctl.head.eof); + goto init_cache; + } + + if (filp->f_pos == 2) { + if (jiffies - ctl.head.time >= SMB_MAX_AGE(server)) + goto init_cache; + + /* + * N.B. ncpfs checks mtime of dentry too here, we don't. + * 1. common smb servers do not update mtime on dir changes + * 2. it requires an extra smb request + * (revalidate has the same timeout as ctl.head.time) + * + * Instead smbfs invalidates its own cache on local changes + * and remote changes are not seen until timeout. + */ + } + + if (filp->f_pos > ctl.head.end) + goto finished; + + ctl.fpos = filp->f_pos + (SMB_DIRCACHE_START - 2); + ctl.ofs = ctl.fpos / SMB_DIRCACHE_SIZE; + ctl.idx = ctl.fpos % SMB_DIRCACHE_SIZE; + + for (;;) { + if (ctl.ofs != 0) { + ctl.page = find_lock_page(&dir->i_data, ctl.ofs); + if (!ctl.page) + goto invalid_cache; + ctl.cache = kmap(ctl.page); + if (!PageUptodate(ctl.page)) + goto invalid_cache; + } + while (ctl.idx < SMB_DIRCACHE_SIZE) { + struct dentry *dent; + int res; + + dent = smb_dget_fpos(ctl.cache->dentry[ctl.idx], + dentry, filp->f_pos); + if (!dent) + goto invalid_cache; + + res = filldir(dirent, dent->d_name.name, + dent->d_name.len, filp->f_pos, + dent->d_inode->i_ino, DT_UNKNOWN); + dput(dent); + if (res) + goto finished; + filp->f_pos += 1; + ctl.idx += 1; + if (filp->f_pos > ctl.head.end) + goto finished; + } + if (ctl.page) { + kunmap(ctl.page); + SetPageUptodate(ctl.page); + unlock_page(ctl.page); + page_cache_release(ctl.page); + ctl.page = NULL; + } + ctl.idx = 0; + ctl.ofs += 1; + } +invalid_cache: + if (ctl.page) { + kunmap(ctl.page); + unlock_page(ctl.page); + page_cache_release(ctl.page); + ctl.page = NULL; + } + ctl.cache = cache; +init_cache: + smb_invalidate_dircache_entries(dentry); + ctl.head.time = jiffies; + ctl.head.eof = 0; + ctl.fpos = 2; + ctl.ofs = 0; + ctl.idx = SMB_DIRCACHE_START; + ctl.filled = 0; + ctl.valid = 1; +read_really: + result = server->ops->readdir(filp, dirent, filldir, &ctl); + if (ctl.idx == -1) + goto invalid_cache; /* retry */ + ctl.head.end = ctl.fpos - 1; + ctl.head.eof = ctl.valid; +finished: + if (page) { + cache->head = ctl.head; + kunmap(page); + SetPageUptodate(page); + unlock_page(page); + page_cache_release(page); + } + if (ctl.page) { + kunmap(ctl.page); + SetPageUptodate(ctl.page); + unlock_page(ctl.page); + page_cache_release(ctl.page); + } +out: + unlock_kernel(); + return result; +} + +static int +smb_dir_open(struct inode *dir, struct file *file) +{ + struct dentry *dentry = file->f_dentry; + struct smb_sb_info *server; + int error = 0; + + VERBOSE("(%s/%s)\n", dentry->d_parent->d_name.name, + file->f_dentry->d_name.name); + + /* + * Directory timestamps in the core protocol aren't updated + * when a file is added, so we give them a very short TTL. + */ + lock_kernel(); + server = server_from_dentry(dentry); + if (server->opt.protocol < SMB_PROTOCOL_LANMAN2) { + unsigned long age = jiffies - SMB_I(dir)->oldmtime; + if (age > 2*HZ) + smb_invalid_dir_cache(dir); + } + + /* + * Note: in order to allow the smbmount process to open the + * mount point, we only revalidate if the connection is valid or + * if the process is trying to access something other than the root. + */ + if (server->state == CONN_VALID || !IS_ROOT(dentry)) + error = smb_revalidate_inode(dentry); + unlock_kernel(); + return error; +} + +/* + * Dentry operations routines + */ +static int smb_lookup_validate(struct dentry *, struct nameidata *); +static int smb_hash_dentry(struct dentry *, struct qstr *); +static int smb_compare_dentry(struct dentry *, struct qstr *, struct qstr *); +static int smb_delete_dentry(struct dentry *); + +static struct dentry_operations smbfs_dentry_operations = +{ + .d_revalidate = smb_lookup_validate, + .d_hash = smb_hash_dentry, + .d_compare = smb_compare_dentry, + .d_delete = smb_delete_dentry, +}; + +static struct dentry_operations smbfs_dentry_operations_case = +{ + .d_revalidate = smb_lookup_validate, + .d_delete = smb_delete_dentry, +}; + + +/* + * This is the callback when the dcache has a lookup hit. + */ +static int +smb_lookup_validate(struct dentry * dentry, struct nameidata *nd) +{ + struct smb_sb_info *server = server_from_dentry(dentry); + struct inode * inode = dentry->d_inode; + unsigned long age = jiffies - dentry->d_time; + int valid; + + /* + * The default validation is based on dentry age: + * we believe in dentries for a few seconds. (But each + * successful server lookup renews the timestamp.) + */ + valid = (age <= SMB_MAX_AGE(server)); +#ifdef SMBFS_DEBUG_VERBOSE + if (!valid) + VERBOSE("%s/%s not valid, age=%lu\n", + DENTRY_PATH(dentry), age); +#endif + + if (inode) { + lock_kernel(); + if (is_bad_inode(inode)) { + PARANOIA("%s/%s has dud inode\n", DENTRY_PATH(dentry)); + valid = 0; + } else if (!valid) + valid = (smb_revalidate_inode(dentry) == 0); + unlock_kernel(); + } else { + /* + * What should we do for negative dentries? + */ + } + return valid; +} + +static int +smb_hash_dentry(struct dentry *dir, struct qstr *this) +{ + unsigned long hash; + int i; + + hash = init_name_hash(); + for (i=0; i < this->len ; i++) + hash = partial_name_hash(tolower(this->name[i]), hash); + this->hash = end_name_hash(hash); + + return 0; +} + +static int +smb_compare_dentry(struct dentry *dir, struct qstr *a, struct qstr *b) +{ + int i, result = 1; + + if (a->len != b->len) + goto out; + for (i=0; i < a->len; i++) { + if (tolower(a->name[i]) != tolower(b->name[i])) + goto out; + } + result = 0; +out: + return result; +} + +/* + * This is the callback from dput() when d_count is going to 0. + * We use this to unhash dentries with bad inodes. + */ +static int +smb_delete_dentry(struct dentry * dentry) +{ + if (dentry->d_inode) { + if (is_bad_inode(dentry->d_inode)) { + PARANOIA("bad inode, unhashing %s/%s\n", + DENTRY_PATH(dentry)); + return 1; + } + } else { + /* N.B. Unhash negative dentries? */ + } + return 0; +} + +/* + * Initialize a new dentry + */ +void +smb_new_dentry(struct dentry *dentry) +{ + struct smb_sb_info *server = server_from_dentry(dentry); + + if (server->mnt->flags & SMB_MOUNT_CASE) + dentry->d_op = &smbfs_dentry_operations_case; + else + dentry->d_op = &smbfs_dentry_operations; + dentry->d_time = jiffies; +} + + +/* + * Whenever a lookup succeeds, we know the parent directories + * are all valid, so we want to update the dentry timestamps. + * N.B. Move this to dcache? + */ +void +smb_renew_times(struct dentry * dentry) +{ + dget(dentry); + spin_lock(&dentry->d_lock); + for (;;) { + struct dentry *parent; + + dentry->d_time = jiffies; + if (IS_ROOT(dentry)) + break; + parent = dentry->d_parent; + dget(parent); + spin_unlock(&dentry->d_lock); + dput(dentry); + dentry = parent; + spin_lock(&dentry->d_lock); + } + spin_unlock(&dentry->d_lock); + dput(dentry); +} + +static struct dentry * +smb_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) +{ + struct smb_fattr finfo; + struct inode *inode; + int error; + struct smb_sb_info *server; + + error = -ENAMETOOLONG; + if (dentry->d_name.len > SMB_MAXNAMELEN) + goto out; + + lock_kernel(); + error = smb_proc_getattr(dentry, &finfo); +#ifdef SMBFS_PARANOIA + if (error && error != -ENOENT) + PARANOIA("find %s/%s failed, error=%d\n", + DENTRY_PATH(dentry), error); +#endif + + inode = NULL; + if (error == -ENOENT) + goto add_entry; + if (!error) { + error = -EACCES; + finfo.f_ino = iunique(dentry->d_sb, 2); + inode = smb_iget(dir->i_sb, &finfo); + if (inode) { + add_entry: + server = server_from_dentry(dentry); + if (server->mnt->flags & SMB_MOUNT_CASE) + dentry->d_op = &smbfs_dentry_operations_case; + else + dentry->d_op = &smbfs_dentry_operations; + + d_add(dentry, inode); + smb_renew_times(dentry); + error = 0; + } + } + unlock_kernel(); +out: + return ERR_PTR(error); +} + +/* + * This code is common to all routines creating a new inode. + */ +static int +smb_instantiate(struct dentry *dentry, __u16 fileid, int have_id) +{ + struct smb_sb_info *server = server_from_dentry(dentry); + struct inode *inode; + int error; + struct smb_fattr fattr; + + VERBOSE("file %s/%s, fileid=%u\n", DENTRY_PATH(dentry), fileid); + + error = smb_proc_getattr(dentry, &fattr); + if (error) + goto out_close; + + smb_renew_times(dentry); + fattr.f_ino = iunique(dentry->d_sb, 2); + inode = smb_iget(dentry->d_sb, &fattr); + if (!inode) + goto out_no_inode; + + if (have_id) { + struct smb_inode_info *ei = SMB_I(inode); + ei->fileid = fileid; + ei->access = SMB_O_RDWR; + ei->open = server->generation; + } + d_instantiate(dentry, inode); +out: + return error; + +out_no_inode: + error = -EACCES; +out_close: + if (have_id) { + PARANOIA("%s/%s failed, error=%d, closing %u\n", + DENTRY_PATH(dentry), error, fileid); + smb_close_fileid(dentry, fileid); + } + goto out; +} + +/* N.B. How should the mode argument be used? */ +static int +smb_create(struct inode *dir, struct dentry *dentry, int mode, + struct nameidata *nd) +{ + struct smb_sb_info *server = server_from_dentry(dentry); + __u16 fileid; + int error; + struct iattr attr; + + VERBOSE("creating %s/%s, mode=%d\n", DENTRY_PATH(dentry), mode); + + lock_kernel(); + smb_invalid_dir_cache(dir); + error = smb_proc_create(dentry, 0, get_seconds(), &fileid); + if (!error) { + if (server->opt.capabilities & SMB_CAP_UNIX) { + /* Set attributes for new file */ + attr.ia_valid = ATTR_MODE; + attr.ia_mode = mode; + error = smb_proc_setattr_unix(dentry, &attr, 0, 0); + } + error = smb_instantiate(dentry, fileid, 1); + } else { + PARANOIA("%s/%s failed, error=%d\n", + DENTRY_PATH(dentry), error); + } + unlock_kernel(); + return error; +} + +/* N.B. How should the mode argument be used? */ +static int +smb_mkdir(struct inode *dir, struct dentry *dentry, int mode) +{ + struct smb_sb_info *server = server_from_dentry(dentry); + int error; + struct iattr attr; + + lock_kernel(); + smb_invalid_dir_cache(dir); + error = smb_proc_mkdir(dentry); + if (!error) { + if (server->opt.capabilities & SMB_CAP_UNIX) { + /* Set attributes for new directory */ + attr.ia_valid = ATTR_MODE; + attr.ia_mode = mode; + error = smb_proc_setattr_unix(dentry, &attr, 0, 0); + } + error = smb_instantiate(dentry, 0, 0); + } + unlock_kernel(); + return error; +} + +static int +smb_rmdir(struct inode *dir, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + int error; + + /* + * Close the directory if it's open. + */ + lock_kernel(); + smb_close(inode); + + /* + * Check that nobody else is using the directory.. + */ + error = -EBUSY; + if (!d_unhashed(dentry)) + goto out; + + smb_invalid_dir_cache(dir); + error = smb_proc_rmdir(dentry); + +out: + unlock_kernel(); + return error; +} + +static int +smb_unlink(struct inode *dir, struct dentry *dentry) +{ + int error; + + /* + * Close the file if it's open. + */ + lock_kernel(); + smb_close(dentry->d_inode); + + smb_invalid_dir_cache(dir); + error = smb_proc_unlink(dentry); + if (!error) + smb_renew_times(dentry); + unlock_kernel(); + return error; +} + +static int +smb_rename(struct inode *old_dir, struct dentry *old_dentry, + struct inode *new_dir, struct dentry *new_dentry) +{ + int error; + + /* + * Close any open files, and check whether to delete the + * target before attempting the rename. + */ + lock_kernel(); + if (old_dentry->d_inode) + smb_close(old_dentry->d_inode); + if (new_dentry->d_inode) { + smb_close(new_dentry->d_inode); + error = smb_proc_unlink(new_dentry); + if (error) { + VERBOSE("unlink %s/%s, error=%d\n", + DENTRY_PATH(new_dentry), error); + goto out; + } + /* FIXME */ + d_delete(new_dentry); + } + + smb_invalid_dir_cache(old_dir); + smb_invalid_dir_cache(new_dir); + error = smb_proc_mv(old_dentry, new_dentry); + if (!error) { + smb_renew_times(old_dentry); + smb_renew_times(new_dentry); + } +out: + unlock_kernel(); + return error; +} + +/* + * FIXME: samba servers won't let you create device nodes unless uid/gid + * matches the connection credentials (and we don't know which those are ...) + */ +static int +smb_make_node(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) +{ + int error; + struct iattr attr; + + attr.ia_valid = ATTR_MODE | ATTR_UID | ATTR_GID; + attr.ia_mode = mode; + attr.ia_uid = current->euid; + attr.ia_gid = current->egid; + + if (!new_valid_dev(dev)) + return -EINVAL; + + smb_invalid_dir_cache(dir); + error = smb_proc_setattr_unix(dentry, &attr, MAJOR(dev), MINOR(dev)); + if (!error) { + error = smb_instantiate(dentry, 0, 0); + } + return error; +} + +/* + * dentry = existing file + * new_dentry = new file + */ +static int +smb_link(struct dentry *dentry, struct inode *dir, struct dentry *new_dentry) +{ + int error; + + DEBUG1("smb_link old=%s/%s new=%s/%s\n", + DENTRY_PATH(dentry), DENTRY_PATH(new_dentry)); + smb_invalid_dir_cache(dir); + error = smb_proc_link(server_from_dentry(dentry), dentry, new_dentry); + if (!error) { + smb_renew_times(dentry); + error = smb_instantiate(new_dentry, 0, 0); + } + return error; +} |