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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/fs/fuse/dir.c
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/fs/fuse/dir.c')
-rw-r--r--ANDROID_3.4.5/fs/fuse/dir.c1697
1 files changed, 0 insertions, 1697 deletions
diff --git a/ANDROID_3.4.5/fs/fuse/dir.c b/ANDROID_3.4.5/fs/fuse/dir.c
deleted file mode 100644
index bc438320..00000000
--- a/ANDROID_3.4.5/fs/fuse/dir.c
+++ /dev/null
@@ -1,1697 +0,0 @@
-/*
- FUSE: Filesystem in Userspace
- Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
-
- This program can be distributed under the terms of the GNU GPL.
- See the file COPYING.
-*/
-
-#include "fuse_i.h"
-
-#include <linux/pagemap.h>
-#include <linux/file.h>
-#include <linux/sched.h>
-#include <linux/namei.h>
-#include <linux/slab.h>
-
-#if BITS_PER_LONG >= 64
-static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
-{
- entry->d_time = time;
-}
-
-static inline u64 fuse_dentry_time(struct dentry *entry)
-{
- return entry->d_time;
-}
-#else
-/*
- * On 32 bit archs store the high 32 bits of time in d_fsdata
- */
-static void fuse_dentry_settime(struct dentry *entry, u64 time)
-{
- entry->d_time = time;
- entry->d_fsdata = (void *) (unsigned long) (time >> 32);
-}
-
-static u64 fuse_dentry_time(struct dentry *entry)
-{
- return (u64) entry->d_time +
- ((u64) (unsigned long) entry->d_fsdata << 32);
-}
-#endif
-
-/*
- * FUSE caches dentries and attributes with separate timeout. The
- * time in jiffies until the dentry/attributes are valid is stored in
- * dentry->d_time and fuse_inode->i_time respectively.
- */
-
-/*
- * Calculate the time in jiffies until a dentry/attributes are valid
- */
-static u64 time_to_jiffies(unsigned long sec, unsigned long nsec)
-{
- if (sec || nsec) {
- struct timespec ts = {sec, nsec};
- return get_jiffies_64() + timespec_to_jiffies(&ts);
- } else
- return 0;
-}
-
-/*
- * Set dentry and possibly attribute timeouts from the lookup/mk*
- * replies
- */
-static void fuse_change_entry_timeout(struct dentry *entry,
- struct fuse_entry_out *o)
-{
- fuse_dentry_settime(entry,
- time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
-}
-
-static u64 attr_timeout(struct fuse_attr_out *o)
-{
- return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
-}
-
-static u64 entry_attr_timeout(struct fuse_entry_out *o)
-{
- return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
-}
-
-/*
- * Mark the attributes as stale, so that at the next call to
- * ->getattr() they will be fetched from userspace
- */
-void fuse_invalidate_attr(struct inode *inode)
-{
- get_fuse_inode(inode)->i_time = 0;
-}
-
-/*
- * Just mark the entry as stale, so that a next attempt to look it up
- * will result in a new lookup call to userspace
- *
- * This is called when a dentry is about to become negative and the
- * timeout is unknown (unlink, rmdir, rename and in some cases
- * lookup)
- */
-void fuse_invalidate_entry_cache(struct dentry *entry)
-{
- fuse_dentry_settime(entry, 0);
-}
-
-/*
- * Same as fuse_invalidate_entry_cache(), but also try to remove the
- * dentry from the hash
- */
-static void fuse_invalidate_entry(struct dentry *entry)
-{
- d_invalidate(entry);
- fuse_invalidate_entry_cache(entry);
-}
-
-static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req,
- u64 nodeid, struct qstr *name,
- struct fuse_entry_out *outarg)
-{
- memset(outarg, 0, sizeof(struct fuse_entry_out));
- req->in.h.opcode = FUSE_LOOKUP;
- req->in.h.nodeid = nodeid;
- req->in.numargs = 1;
- req->in.args[0].size = name->len + 1;
- req->in.args[0].value = name->name;
- req->out.numargs = 1;
- if (fc->minor < 9)
- req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
- else
- req->out.args[0].size = sizeof(struct fuse_entry_out);
- req->out.args[0].value = outarg;
-}
-
-u64 fuse_get_attr_version(struct fuse_conn *fc)
-{
- u64 curr_version;
-
- /*
- * The spin lock isn't actually needed on 64bit archs, but we
- * don't yet care too much about such optimizations.
- */
- spin_lock(&fc->lock);
- curr_version = fc->attr_version;
- spin_unlock(&fc->lock);
-
- return curr_version;
-}
-
-/*
- * Check whether the dentry is still valid
- *
- * If the entry validity timeout has expired and the dentry is
- * positive, try to redo the lookup. If the lookup results in a
- * different inode, then let the VFS invalidate the dentry and redo
- * the lookup once more. If the lookup results in the same inode,
- * then refresh the attributes, timeouts and mark the dentry valid.
- */
-static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
-{
- struct inode *inode;
-
- inode = ACCESS_ONCE(entry->d_inode);
- if (inode && is_bad_inode(inode))
- return 0;
- else if (fuse_dentry_time(entry) < get_jiffies_64()) {
- int err;
- struct fuse_entry_out outarg;
- struct fuse_conn *fc;
- struct fuse_req *req;
- struct fuse_forget_link *forget;
- struct dentry *parent;
- u64 attr_version;
-
- /* For negative dentries, always do a fresh lookup */
- if (!inode)
- return 0;
-
- if (nd && (nd->flags & LOOKUP_RCU))
- return -ECHILD;
-
- fc = get_fuse_conn(inode);
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return 0;
-
- forget = fuse_alloc_forget();
- if (!forget) {
- fuse_put_request(fc, req);
- return 0;
- }
-
- attr_version = fuse_get_attr_version(fc);
-
- parent = dget_parent(entry);
- fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
- &entry->d_name, &outarg);
- fuse_request_send(fc, req);
- dput(parent);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- /* Zero nodeid is same as -ENOENT */
- if (!err && !outarg.nodeid)
- err = -ENOENT;
- if (!err) {
- struct fuse_inode *fi = get_fuse_inode(inode);
- if (outarg.nodeid != get_node_id(inode)) {
- fuse_queue_forget(fc, forget, outarg.nodeid, 1);
- return 0;
- }
- spin_lock(&fc->lock);
- fi->nlookup++;
- spin_unlock(&fc->lock);
- }
- kfree(forget);
- if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
- return 0;
-
- fuse_change_attributes(inode, &outarg.attr,
- entry_attr_timeout(&outarg),
- attr_version);
- fuse_change_entry_timeout(entry, &outarg);
- }
- return 1;
-}
-
-static int invalid_nodeid(u64 nodeid)
-{
- return !nodeid || nodeid == FUSE_ROOT_ID;
-}
-
-const struct dentry_operations fuse_dentry_operations = {
- .d_revalidate = fuse_dentry_revalidate,
-};
-
-int fuse_valid_type(int m)
-{
- return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
- S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
-}
-
-/*
- * Add a directory inode to a dentry, ensuring that no other dentry
- * refers to this inode. Called with fc->inst_mutex.
- */
-static struct dentry *fuse_d_add_directory(struct dentry *entry,
- struct inode *inode)
-{
- struct dentry *alias = d_find_alias(inode);
- if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
- /* This tries to shrink the subtree below alias */
- fuse_invalidate_entry(alias);
- dput(alias);
- if (!list_empty(&inode->i_dentry))
- return ERR_PTR(-EBUSY);
- } else {
- dput(alias);
- }
- return d_splice_alias(inode, entry);
-}
-
-int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
- struct fuse_entry_out *outarg, struct inode **inode)
-{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
- struct fuse_req *req;
- struct fuse_forget_link *forget;
- u64 attr_version;
- int err;
-
- *inode = NULL;
- err = -ENAMETOOLONG;
- if (name->len > FUSE_NAME_MAX)
- goto out;
-
- req = fuse_get_req(fc);
- err = PTR_ERR(req);
- if (IS_ERR(req))
- goto out;
-
- forget = fuse_alloc_forget();
- err = -ENOMEM;
- if (!forget) {
- fuse_put_request(fc, req);
- goto out;
- }
-
- attr_version = fuse_get_attr_version(fc);
-
- fuse_lookup_init(fc, req, nodeid, name, outarg);
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- /* Zero nodeid is same as -ENOENT, but with valid timeout */
- if (err || !outarg->nodeid)
- goto out_put_forget;
-
- err = -EIO;
- if (!outarg->nodeid)
- goto out_put_forget;
- if (!fuse_valid_type(outarg->attr.mode))
- goto out_put_forget;
-
- *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
- &outarg->attr, entry_attr_timeout(outarg),
- attr_version);
- err = -ENOMEM;
- if (!*inode) {
- fuse_queue_forget(fc, forget, outarg->nodeid, 1);
- goto out;
- }
- err = 0;
-
- out_put_forget:
- kfree(forget);
- out:
- return err;
-}
-
-static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
- struct nameidata *nd)
-{
- int err;
- struct fuse_entry_out outarg;
- struct inode *inode;
- struct dentry *newent;
- struct fuse_conn *fc = get_fuse_conn(dir);
- bool outarg_valid = true;
-
- err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
- &outarg, &inode);
- if (err == -ENOENT) {
- outarg_valid = false;
- err = 0;
- }
- if (err)
- goto out_err;
-
- err = -EIO;
- if (inode && get_node_id(inode) == FUSE_ROOT_ID)
- goto out_iput;
-
- if (inode && S_ISDIR(inode->i_mode)) {
- mutex_lock(&fc->inst_mutex);
- newent = fuse_d_add_directory(entry, inode);
- mutex_unlock(&fc->inst_mutex);
- err = PTR_ERR(newent);
- if (IS_ERR(newent))
- goto out_iput;
- } else {
- newent = d_splice_alias(inode, entry);
- }
-
- entry = newent ? newent : entry;
- if (outarg_valid)
- fuse_change_entry_timeout(entry, &outarg);
- else
- fuse_invalidate_entry_cache(entry);
-
- return newent;
-
- out_iput:
- iput(inode);
- out_err:
- return ERR_PTR(err);
-}
-
-/*
- * Atomic create+open operation
- *
- * If the filesystem doesn't support this, then fall back to separate
- * 'mknod' + 'open' requests.
- */
-static int fuse_create_open(struct inode *dir, struct dentry *entry,
- umode_t mode, struct nameidata *nd)
-{
- int err;
- struct inode *inode;
- struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req;
- struct fuse_forget_link *forget;
- struct fuse_create_in inarg;
- struct fuse_open_out outopen;
- struct fuse_entry_out outentry;
- struct fuse_file *ff;
- struct file *file;
- int flags = nd->intent.open.flags;
-
- if (fc->no_create)
- return -ENOSYS;
-
- forget = fuse_alloc_forget();
- if (!forget)
- return -ENOMEM;
-
- req = fuse_get_req(fc);
- err = PTR_ERR(req);
- if (IS_ERR(req))
- goto out_put_forget_req;
-
- err = -ENOMEM;
- ff = fuse_file_alloc(fc);
- if (!ff)
- goto out_put_request;
-
- if (!fc->dont_mask)
- mode &= ~current_umask();
-
- flags &= ~O_NOCTTY;
- memset(&inarg, 0, sizeof(inarg));
- memset(&outentry, 0, sizeof(outentry));
- inarg.flags = flags;
- inarg.mode = mode;
- inarg.umask = current_umask();
- req->in.h.opcode = FUSE_CREATE;
- req->in.h.nodeid = get_node_id(dir);
- req->in.numargs = 2;
- req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
- sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->in.args[1].size = entry->d_name.len + 1;
- req->in.args[1].value = entry->d_name.name;
- req->out.numargs = 2;
- if (fc->minor < 9)
- req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
- else
- req->out.args[0].size = sizeof(outentry);
- req->out.args[0].value = &outentry;
- req->out.args[1].size = sizeof(outopen);
- req->out.args[1].value = &outopen;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- if (err) {
- if (err == -ENOSYS)
- fc->no_create = 1;
- goto out_free_ff;
- }
-
- err = -EIO;
- if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
- goto out_free_ff;
-
- fuse_put_request(fc, req);
- ff->fh = outopen.fh;
- ff->nodeid = outentry.nodeid;
- ff->open_flags = outopen.open_flags;
- inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
- &outentry.attr, entry_attr_timeout(&outentry), 0);
- if (!inode) {
- flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
- fuse_sync_release(ff, flags);
- fuse_queue_forget(fc, forget, outentry.nodeid, 1);
- return -ENOMEM;
- }
- kfree(forget);
- d_instantiate(entry, inode);
- fuse_change_entry_timeout(entry, &outentry);
- fuse_invalidate_attr(dir);
- file = lookup_instantiate_filp(nd, entry, generic_file_open);
- if (IS_ERR(file)) {
- fuse_sync_release(ff, flags);
- return PTR_ERR(file);
- }
- file->private_data = fuse_file_get(ff);
- fuse_finish_open(inode, file);
- return 0;
-
- out_free_ff:
- fuse_file_free(ff);
- out_put_request:
- fuse_put_request(fc, req);
- out_put_forget_req:
- kfree(forget);
- return err;
-}
-
-/*
- * Code shared between mknod, mkdir, symlink and link
- */
-static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
- struct inode *dir, struct dentry *entry,
- umode_t mode)
-{
- struct fuse_entry_out outarg;
- struct inode *inode;
- int err;
- struct fuse_forget_link *forget;
-
- forget = fuse_alloc_forget();
- if (!forget) {
- fuse_put_request(fc, req);
- return -ENOMEM;
- }
-
- memset(&outarg, 0, sizeof(outarg));
- req->in.h.nodeid = get_node_id(dir);
- req->out.numargs = 1;
- if (fc->minor < 9)
- req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
- else
- req->out.args[0].size = sizeof(outarg);
- req->out.args[0].value = &outarg;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (err)
- goto out_put_forget_req;
-
- err = -EIO;
- if (invalid_nodeid(outarg.nodeid))
- goto out_put_forget_req;
-
- if ((outarg.attr.mode ^ mode) & S_IFMT)
- goto out_put_forget_req;
-
- inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
- &outarg.attr, entry_attr_timeout(&outarg), 0);
- if (!inode) {
- fuse_queue_forget(fc, forget, outarg.nodeid, 1);
- return -ENOMEM;
- }
- kfree(forget);
-
- if (S_ISDIR(inode->i_mode)) {
- struct dentry *alias;
- mutex_lock(&fc->inst_mutex);
- alias = d_find_alias(inode);
- if (alias) {
- /* New directory must have moved since mkdir */
- mutex_unlock(&fc->inst_mutex);
- dput(alias);
- iput(inode);
- return -EBUSY;
- }
- d_instantiate(entry, inode);
- mutex_unlock(&fc->inst_mutex);
- } else
- d_instantiate(entry, inode);
-
- fuse_change_entry_timeout(entry, &outarg);
- fuse_invalidate_attr(dir);
- return 0;
-
- out_put_forget_req:
- kfree(forget);
- return err;
-}
-
-static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
- dev_t rdev)
-{
- struct fuse_mknod_in inarg;
- struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- if (!fc->dont_mask)
- mode &= ~current_umask();
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.mode = mode;
- inarg.rdev = new_encode_dev(rdev);
- inarg.umask = current_umask();
- req->in.h.opcode = FUSE_MKNOD;
- req->in.numargs = 2;
- req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
- sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->in.args[1].size = entry->d_name.len + 1;
- req->in.args[1].value = entry->d_name.name;
- return create_new_entry(fc, req, dir, entry, mode);
-}
-
-static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
- struct nameidata *nd)
-{
- if (nd) {
- int err = fuse_create_open(dir, entry, mode, nd);
- if (err != -ENOSYS)
- return err;
- /* Fall back on mknod */
- }
- return fuse_mknod(dir, entry, mode, 0);
-}
-
-static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
-{
- struct fuse_mkdir_in inarg;
- struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- if (!fc->dont_mask)
- mode &= ~current_umask();
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.mode = mode;
- inarg.umask = current_umask();
- req->in.h.opcode = FUSE_MKDIR;
- req->in.numargs = 2;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->in.args[1].size = entry->d_name.len + 1;
- req->in.args[1].value = entry->d_name.name;
- return create_new_entry(fc, req, dir, entry, S_IFDIR);
-}
-
-static int fuse_symlink(struct inode *dir, struct dentry *entry,
- const char *link)
-{
- struct fuse_conn *fc = get_fuse_conn(dir);
- unsigned len = strlen(link) + 1;
- struct fuse_req *req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- req->in.h.opcode = FUSE_SYMLINK;
- req->in.numargs = 2;
- req->in.args[0].size = entry->d_name.len + 1;
- req->in.args[0].value = entry->d_name.name;
- req->in.args[1].size = len;
- req->in.args[1].value = link;
- return create_new_entry(fc, req, dir, entry, S_IFLNK);
-}
-
-static int fuse_unlink(struct inode *dir, struct dentry *entry)
-{
- int err;
- struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- req->in.h.opcode = FUSE_UNLINK;
- req->in.h.nodeid = get_node_id(dir);
- req->in.numargs = 1;
- req->in.args[0].size = entry->d_name.len + 1;
- req->in.args[0].value = entry->d_name.name;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (!err) {
- struct inode *inode = entry->d_inode;
- struct fuse_inode *fi = get_fuse_inode(inode);
-
- spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
- drop_nlink(inode);
- spin_unlock(&fc->lock);
- fuse_invalidate_attr(inode);
- fuse_invalidate_attr(dir);
- fuse_invalidate_entry_cache(entry);
- } else if (err == -EINTR)
- fuse_invalidate_entry(entry);
- return err;
-}
-
-static int fuse_rmdir(struct inode *dir, struct dentry *entry)
-{
- int err;
- struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_req *req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- req->in.h.opcode = FUSE_RMDIR;
- req->in.h.nodeid = get_node_id(dir);
- req->in.numargs = 1;
- req->in.args[0].size = entry->d_name.len + 1;
- req->in.args[0].value = entry->d_name.name;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (!err) {
- clear_nlink(entry->d_inode);
- fuse_invalidate_attr(dir);
- fuse_invalidate_entry_cache(entry);
- } else if (err == -EINTR)
- fuse_invalidate_entry(entry);
- return err;
-}
-
-static int fuse_rename(struct inode *olddir, struct dentry *oldent,
- struct inode *newdir, struct dentry *newent)
-{
- int err;
- struct fuse_rename_in inarg;
- struct fuse_conn *fc = get_fuse_conn(olddir);
- struct fuse_req *req = fuse_get_req(fc);
-
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.newdir = get_node_id(newdir);
- req->in.h.opcode = FUSE_RENAME;
- req->in.h.nodeid = get_node_id(olddir);
- req->in.numargs = 3;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->in.args[1].size = oldent->d_name.len + 1;
- req->in.args[1].value = oldent->d_name.name;
- req->in.args[2].size = newent->d_name.len + 1;
- req->in.args[2].value = newent->d_name.name;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (!err) {
- /* ctime changes */
- fuse_invalidate_attr(oldent->d_inode);
-
- fuse_invalidate_attr(olddir);
- if (olddir != newdir)
- fuse_invalidate_attr(newdir);
-
- /* newent will end up negative */
- if (newent->d_inode) {
- fuse_invalidate_attr(newent->d_inode);
- fuse_invalidate_entry_cache(newent);
- }
- } else if (err == -EINTR) {
- /* If request was interrupted, DEITY only knows if the
- rename actually took place. If the invalidation
- fails (e.g. some process has CWD under the renamed
- directory), then there can be inconsistency between
- the dcache and the real filesystem. Tough luck. */
- fuse_invalidate_entry(oldent);
- if (newent->d_inode)
- fuse_invalidate_entry(newent);
- }
-
- return err;
-}
-
-static int fuse_link(struct dentry *entry, struct inode *newdir,
- struct dentry *newent)
-{
- int err;
- struct fuse_link_in inarg;
- struct inode *inode = entry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.oldnodeid = get_node_id(inode);
- req->in.h.opcode = FUSE_LINK;
- req->in.numargs = 2;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->in.args[1].size = newent->d_name.len + 1;
- req->in.args[1].value = newent->d_name.name;
- err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
- /* Contrary to "normal" filesystems it can happen that link
- makes two "logical" inodes point to the same "physical"
- inode. We invalidate the attributes of the old one, so it
- will reflect changes in the backing inode (link count,
- etc.)
- */
- if (!err) {
- struct fuse_inode *fi = get_fuse_inode(inode);
-
- spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
- inc_nlink(inode);
- spin_unlock(&fc->lock);
- fuse_invalidate_attr(inode);
- } else if (err == -EINTR) {
- fuse_invalidate_attr(inode);
- }
- return err;
-}
-
-static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
- struct kstat *stat)
-{
- stat->dev = inode->i_sb->s_dev;
- stat->ino = attr->ino;
- stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
- stat->nlink = attr->nlink;
- stat->uid = attr->uid;
- stat->gid = attr->gid;
- stat->rdev = inode->i_rdev;
- stat->atime.tv_sec = attr->atime;
- stat->atime.tv_nsec = attr->atimensec;
- stat->mtime.tv_sec = attr->mtime;
- stat->mtime.tv_nsec = attr->mtimensec;
- stat->ctime.tv_sec = attr->ctime;
- stat->ctime.tv_nsec = attr->ctimensec;
- stat->size = attr->size;
- stat->blocks = attr->blocks;
- stat->blksize = (1 << inode->i_blkbits);
-}
-
-static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
- struct file *file)
-{
- int err;
- struct fuse_getattr_in inarg;
- struct fuse_attr_out outarg;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- u64 attr_version;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- attr_version = fuse_get_attr_version(fc);
-
- memset(&inarg, 0, sizeof(inarg));
- memset(&outarg, 0, sizeof(outarg));
- /* Directories have separate file-handle space */
- if (file && S_ISREG(inode->i_mode)) {
- struct fuse_file *ff = file->private_data;
-
- inarg.getattr_flags |= FUSE_GETATTR_FH;
- inarg.fh = ff->fh;
- }
- req->in.h.opcode = FUSE_GETATTR;
- req->in.h.nodeid = get_node_id(inode);
- req->in.numargs = 1;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->out.numargs = 1;
- if (fc->minor < 9)
- req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
- else
- req->out.args[0].size = sizeof(outarg);
- req->out.args[0].value = &outarg;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (!err) {
- if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
- make_bad_inode(inode);
- err = -EIO;
- } else {
- fuse_change_attributes(inode, &outarg.attr,
- attr_timeout(&outarg),
- attr_version);
- if (stat)
- fuse_fillattr(inode, &outarg.attr, stat);
- }
- }
- return err;
-}
-
-int fuse_update_attributes(struct inode *inode, struct kstat *stat,
- struct file *file, bool *refreshed)
-{
- struct fuse_inode *fi = get_fuse_inode(inode);
- int err;
- bool r;
-
- if (fi->i_time < get_jiffies_64()) {
- r = true;
- err = fuse_do_getattr(inode, stat, file);
- } else {
- r = false;
- err = 0;
- if (stat) {
- generic_fillattr(inode, stat);
- stat->mode = fi->orig_i_mode;
- stat->ino = fi->orig_ino;
- }
- }
-
- if (refreshed != NULL)
- *refreshed = r;
-
- return err;
-}
-
-int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
- u64 child_nodeid, struct qstr *name)
-{
- int err = -ENOTDIR;
- struct inode *parent;
- struct dentry *dir;
- struct dentry *entry;
-
- parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
- if (!parent)
- return -ENOENT;
-
- mutex_lock(&parent->i_mutex);
- if (!S_ISDIR(parent->i_mode))
- goto unlock;
-
- err = -ENOENT;
- dir = d_find_alias(parent);
- if (!dir)
- goto unlock;
-
- entry = d_lookup(dir, name);
- dput(dir);
- if (!entry)
- goto unlock;
-
- fuse_invalidate_attr(parent);
- fuse_invalidate_entry(entry);
-
- if (child_nodeid != 0 && entry->d_inode) {
- mutex_lock(&entry->d_inode->i_mutex);
- if (get_node_id(entry->d_inode) != child_nodeid) {
- err = -ENOENT;
- goto badentry;
- }
- if (d_mountpoint(entry)) {
- err = -EBUSY;
- goto badentry;
- }
- if (S_ISDIR(entry->d_inode->i_mode)) {
- shrink_dcache_parent(entry);
- if (!simple_empty(entry)) {
- err = -ENOTEMPTY;
- goto badentry;
- }
- entry->d_inode->i_flags |= S_DEAD;
- }
- dont_mount(entry);
- clear_nlink(entry->d_inode);
- err = 0;
- badentry:
- mutex_unlock(&entry->d_inode->i_mutex);
- if (!err)
- d_delete(entry);
- } else {
- err = 0;
- }
- dput(entry);
-
- unlock:
- mutex_unlock(&parent->i_mutex);
- iput(parent);
- return err;
-}
-
-/*
- * Calling into a user-controlled filesystem gives the filesystem
- * daemon ptrace-like capabilities over the requester process. This
- * means, that the filesystem daemon is able to record the exact
- * filesystem operations performed, and can also control the behavior
- * of the requester process in otherwise impossible ways. For example
- * it can delay the operation for arbitrary length of time allowing
- * DoS against the requester.
- *
- * For this reason only those processes can call into the filesystem,
- * for which the owner of the mount has ptrace privilege. This
- * excludes processes started by other users, suid or sgid processes.
- */
-int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
-{
- const struct cred *cred;
- int ret;
-
- if (fc->flags & FUSE_ALLOW_OTHER)
- return 1;
-
- rcu_read_lock();
- ret = 0;
- cred = __task_cred(task);
- if (cred->euid == fc->user_id &&
- cred->suid == fc->user_id &&
- cred->uid == fc->user_id &&
- cred->egid == fc->group_id &&
- cred->sgid == fc->group_id &&
- cred->gid == fc->group_id)
- ret = 1;
- rcu_read_unlock();
-
- return ret;
-}
-
-static int fuse_access(struct inode *inode, int mask)
-{
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- struct fuse_access_in inarg;
- int err;
-
- if (fc->no_access)
- return 0;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
- req->in.h.opcode = FUSE_ACCESS;
- req->in.h.nodeid = get_node_id(inode);
- req->in.numargs = 1;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (err == -ENOSYS) {
- fc->no_access = 1;
- err = 0;
- }
- return err;
-}
-
-static int fuse_perm_getattr(struct inode *inode, int mask)
-{
- if (mask & MAY_NOT_BLOCK)
- return -ECHILD;
-
- return fuse_do_getattr(inode, NULL, NULL);
-}
-
-/*
- * Check permission. The two basic access models of FUSE are:
- *
- * 1) Local access checking ('default_permissions' mount option) based
- * on file mode. This is the plain old disk filesystem permission
- * modell.
- *
- * 2) "Remote" access checking, where server is responsible for
- * checking permission in each inode operation. An exception to this
- * is if ->permission() was invoked from sys_access() in which case an
- * access request is sent. Execute permission is still checked
- * locally based on file mode.
- */
-static int fuse_permission(struct inode *inode, int mask)
-{
- struct fuse_conn *fc = get_fuse_conn(inode);
- bool refreshed = false;
- int err = 0;
-
- if (!fuse_allow_task(fc, current))
- return -EACCES;
-
- /*
- * If attributes are needed, refresh them before proceeding
- */
- if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
- ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
- struct fuse_inode *fi = get_fuse_inode(inode);
-
- if (fi->i_time < get_jiffies_64()) {
- refreshed = true;
-
- err = fuse_perm_getattr(inode, mask);
- if (err)
- return err;
- }
- }
-
- if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
- err = generic_permission(inode, mask);
-
- /* If permission is denied, try to refresh file
- attributes. This is also needed, because the root
- node will at first have no permissions */
- if (err == -EACCES && !refreshed) {
- err = fuse_perm_getattr(inode, mask);
- if (!err)
- err = generic_permission(inode, mask);
- }
-
- /* Note: the opposite of the above test does not
- exist. So if permissions are revoked this won't be
- noticed immediately, only after the attribute
- timeout has expired */
- } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
- if (mask & MAY_NOT_BLOCK)
- return -ECHILD;
-
- err = fuse_access(inode, mask);
- } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
- if (!(inode->i_mode & S_IXUGO)) {
- if (refreshed)
- return -EACCES;
-
- err = fuse_perm_getattr(inode, mask);
- if (!err && !(inode->i_mode & S_IXUGO))
- return -EACCES;
- }
- }
- return err;
-}
-
-static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
- void *dstbuf, filldir_t filldir)
-{
- while (nbytes >= FUSE_NAME_OFFSET) {
- struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
- size_t reclen = FUSE_DIRENT_SIZE(dirent);
- int over;
- if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
- return -EIO;
- if (reclen > nbytes)
- break;
-
- over = filldir(dstbuf, dirent->name, dirent->namelen,
- file->f_pos, dirent->ino, dirent->type);
- if (over)
- break;
-
- buf += reclen;
- nbytes -= reclen;
- file->f_pos = dirent->off;
- }
-
- return 0;
-}
-
-static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
-{
- int err;
- size_t nbytes;
- struct page *page;
- struct inode *inode = file->f_path.dentry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
-
- if (is_bad_inode(inode))
- return -EIO;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- page = alloc_page(GFP_KERNEL);
- if (!page) {
- fuse_put_request(fc, req);
- return -ENOMEM;
- }
- req->out.argpages = 1;
- req->num_pages = 1;
- req->pages[0] = page;
- fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
- fuse_request_send(fc, req);
- nbytes = req->out.args[0].size;
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (!err)
- err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
- filldir);
-
- __free_page(page);
- fuse_invalidate_attr(inode); /* atime changed */
- return err;
-}
-
-static char *read_link(struct dentry *dentry)
-{
- struct inode *inode = dentry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req = fuse_get_req(fc);
- char *link;
-
- if (IS_ERR(req))
- return ERR_CAST(req);
-
- link = (char *) __get_free_page(GFP_KERNEL);
- if (!link) {
- link = ERR_PTR(-ENOMEM);
- goto out;
- }
- req->in.h.opcode = FUSE_READLINK;
- req->in.h.nodeid = get_node_id(inode);
- req->out.argvar = 1;
- req->out.numargs = 1;
- req->out.args[0].size = PAGE_SIZE - 1;
- req->out.args[0].value = link;
- fuse_request_send(fc, req);
- if (req->out.h.error) {
- free_page((unsigned long) link);
- link = ERR_PTR(req->out.h.error);
- } else
- link[req->out.args[0].size] = '\0';
- out:
- fuse_put_request(fc, req);
- fuse_invalidate_attr(inode); /* atime changed */
- return link;
-}
-
-static void free_link(char *link)
-{
- if (!IS_ERR(link))
- free_page((unsigned long) link);
-}
-
-static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
- nd_set_link(nd, read_link(dentry));
- return NULL;
-}
-
-static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
-{
- free_link(nd_get_link(nd));
-}
-
-static int fuse_dir_open(struct inode *inode, struct file *file)
-{
- return fuse_open_common(inode, file, true);
-}
-
-static int fuse_dir_release(struct inode *inode, struct file *file)
-{
- fuse_release_common(file, FUSE_RELEASEDIR);
-
- return 0;
-}
-
-static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
- int datasync)
-{
- return fuse_fsync_common(file, start, end, datasync, 1);
-}
-
-static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
-
- /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
- if (fc->minor < 18)
- return -ENOTTY;
-
- return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
-}
-
-static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
- unsigned long arg)
-{
- struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
-
- if (fc->minor < 18)
- return -ENOTTY;
-
- return fuse_ioctl_common(file, cmd, arg,
- FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
-}
-
-static bool update_mtime(unsigned ivalid)
-{
- /* Always update if mtime is explicitly set */
- if (ivalid & ATTR_MTIME_SET)
- return true;
-
- /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
- if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
- return false;
-
- /* In all other cases update */
- return true;
-}
-
-static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
-{
- unsigned ivalid = iattr->ia_valid;
-
- if (ivalid & ATTR_MODE)
- arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
- if (ivalid & ATTR_UID)
- arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
- if (ivalid & ATTR_GID)
- arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
- if (ivalid & ATTR_SIZE)
- arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
- if (ivalid & ATTR_ATIME) {
- arg->valid |= FATTR_ATIME;
- arg->atime = iattr->ia_atime.tv_sec;
- arg->atimensec = iattr->ia_atime.tv_nsec;
- if (!(ivalid & ATTR_ATIME_SET))
- arg->valid |= FATTR_ATIME_NOW;
- }
- if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
- arg->valid |= FATTR_MTIME;
- arg->mtime = iattr->ia_mtime.tv_sec;
- arg->mtimensec = iattr->ia_mtime.tv_nsec;
- if (!(ivalid & ATTR_MTIME_SET))
- arg->valid |= FATTR_MTIME_NOW;
- }
-}
-
-/*
- * Prevent concurrent writepages on inode
- *
- * This is done by adding a negative bias to the inode write counter
- * and waiting for all pending writes to finish.
- */
-void fuse_set_nowrite(struct inode *inode)
-{
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_inode *fi = get_fuse_inode(inode);
-
- BUG_ON(!mutex_is_locked(&inode->i_mutex));
-
- spin_lock(&fc->lock);
- BUG_ON(fi->writectr < 0);
- fi->writectr += FUSE_NOWRITE;
- spin_unlock(&fc->lock);
- wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
-}
-
-/*
- * Allow writepages on inode
- *
- * Remove the bias from the writecounter and send any queued
- * writepages.
- */
-static void __fuse_release_nowrite(struct inode *inode)
-{
- struct fuse_inode *fi = get_fuse_inode(inode);
-
- BUG_ON(fi->writectr != FUSE_NOWRITE);
- fi->writectr = 0;
- fuse_flush_writepages(inode);
-}
-
-void fuse_release_nowrite(struct inode *inode)
-{
- struct fuse_conn *fc = get_fuse_conn(inode);
-
- spin_lock(&fc->lock);
- __fuse_release_nowrite(inode);
- spin_unlock(&fc->lock);
-}
-
-/*
- * Set attributes, and at the same time refresh them.
- *
- * Truncation is slightly complicated, because the 'truncate' request
- * may fail, in which case we don't want to touch the mapping.
- * vmtruncate() doesn't allow for this case, so do the rlimit checking
- * and the actual truncation by hand.
- */
-static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
- struct file *file)
-{
- struct inode *inode = entry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- struct fuse_setattr_in inarg;
- struct fuse_attr_out outarg;
- bool is_truncate = false;
- loff_t oldsize;
- int err;
-
- if (!fuse_allow_task(fc, current))
- return -EACCES;
-
- if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
- attr->ia_valid |= ATTR_FORCE;
-
- err = inode_change_ok(inode, attr);
- if (err)
- return err;
-
- if (attr->ia_valid & ATTR_OPEN) {
- if (fc->atomic_o_trunc)
- return 0;
- file = NULL;
- }
-
- if (attr->ia_valid & ATTR_SIZE)
- is_truncate = true;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- if (is_truncate)
- fuse_set_nowrite(inode);
-
- memset(&inarg, 0, sizeof(inarg));
- memset(&outarg, 0, sizeof(outarg));
- iattr_to_fattr(attr, &inarg);
- if (file) {
- struct fuse_file *ff = file->private_data;
- inarg.valid |= FATTR_FH;
- inarg.fh = ff->fh;
- }
- if (attr->ia_valid & ATTR_SIZE) {
- /* For mandatory locking in truncate */
- inarg.valid |= FATTR_LOCKOWNER;
- inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
- }
- req->in.h.opcode = FUSE_SETATTR;
- req->in.h.nodeid = get_node_id(inode);
- req->in.numargs = 1;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->out.numargs = 1;
- if (fc->minor < 9)
- req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
- else
- req->out.args[0].size = sizeof(outarg);
- req->out.args[0].value = &outarg;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (err) {
- if (err == -EINTR)
- fuse_invalidate_attr(inode);
- goto error;
- }
-
- if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
- make_bad_inode(inode);
- err = -EIO;
- goto error;
- }
-
- spin_lock(&fc->lock);
- fuse_change_attributes_common(inode, &outarg.attr,
- attr_timeout(&outarg));
- oldsize = inode->i_size;
- i_size_write(inode, outarg.attr.size);
-
- if (is_truncate) {
- /* NOTE: this may release/reacquire fc->lock */
- __fuse_release_nowrite(inode);
- }
- spin_unlock(&fc->lock);
-
- /*
- * Only call invalidate_inode_pages2() after removing
- * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
- */
- if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
- truncate_pagecache(inode, oldsize, outarg.attr.size);
- invalidate_inode_pages2(inode->i_mapping);
- }
-
- return 0;
-
-error:
- if (is_truncate)
- fuse_release_nowrite(inode);
-
- return err;
-}
-
-static int fuse_setattr(struct dentry *entry, struct iattr *attr)
-{
- if (attr->ia_valid & ATTR_FILE)
- return fuse_do_setattr(entry, attr, attr->ia_file);
- else
- return fuse_do_setattr(entry, attr, NULL);
-}
-
-static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
- struct kstat *stat)
-{
- struct inode *inode = entry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
-
- if (!fuse_allow_task(fc, current))
- return -EACCES;
-
- return fuse_update_attributes(inode, stat, NULL, NULL);
-}
-
-static int fuse_setxattr(struct dentry *entry, const char *name,
- const void *value, size_t size, int flags)
-{
- struct inode *inode = entry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- struct fuse_setxattr_in inarg;
- int err;
-
- if (fc->no_setxattr)
- return -EOPNOTSUPP;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.size = size;
- inarg.flags = flags;
- req->in.h.opcode = FUSE_SETXATTR;
- req->in.h.nodeid = get_node_id(inode);
- req->in.numargs = 3;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->in.args[1].size = strlen(name) + 1;
- req->in.args[1].value = name;
- req->in.args[2].size = size;
- req->in.args[2].value = value;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (err == -ENOSYS) {
- fc->no_setxattr = 1;
- err = -EOPNOTSUPP;
- }
- return err;
-}
-
-static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
- void *value, size_t size)
-{
- struct inode *inode = entry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- struct fuse_getxattr_in inarg;
- struct fuse_getxattr_out outarg;
- ssize_t ret;
-
- if (fc->no_getxattr)
- return -EOPNOTSUPP;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.size = size;
- req->in.h.opcode = FUSE_GETXATTR;
- req->in.h.nodeid = get_node_id(inode);
- req->in.numargs = 2;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->in.args[1].size = strlen(name) + 1;
- req->in.args[1].value = name;
- /* This is really two different operations rolled into one */
- req->out.numargs = 1;
- if (size) {
- req->out.argvar = 1;
- req->out.args[0].size = size;
- req->out.args[0].value = value;
- } else {
- req->out.args[0].size = sizeof(outarg);
- req->out.args[0].value = &outarg;
- }
- fuse_request_send(fc, req);
- ret = req->out.h.error;
- if (!ret)
- ret = size ? req->out.args[0].size : outarg.size;
- else {
- if (ret == -ENOSYS) {
- fc->no_getxattr = 1;
- ret = -EOPNOTSUPP;
- }
- }
- fuse_put_request(fc, req);
- return ret;
-}
-
-static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
-{
- struct inode *inode = entry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- struct fuse_getxattr_in inarg;
- struct fuse_getxattr_out outarg;
- ssize_t ret;
-
- if (!fuse_allow_task(fc, current))
- return -EACCES;
-
- if (fc->no_listxattr)
- return -EOPNOTSUPP;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.size = size;
- req->in.h.opcode = FUSE_LISTXATTR;
- req->in.h.nodeid = get_node_id(inode);
- req->in.numargs = 1;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- /* This is really two different operations rolled into one */
- req->out.numargs = 1;
- if (size) {
- req->out.argvar = 1;
- req->out.args[0].size = size;
- req->out.args[0].value = list;
- } else {
- req->out.args[0].size = sizeof(outarg);
- req->out.args[0].value = &outarg;
- }
- fuse_request_send(fc, req);
- ret = req->out.h.error;
- if (!ret)
- ret = size ? req->out.args[0].size : outarg.size;
- else {
- if (ret == -ENOSYS) {
- fc->no_listxattr = 1;
- ret = -EOPNOTSUPP;
- }
- }
- fuse_put_request(fc, req);
- return ret;
-}
-
-static int fuse_removexattr(struct dentry *entry, const char *name)
-{
- struct inode *inode = entry->d_inode;
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- int err;
-
- if (fc->no_removexattr)
- return -EOPNOTSUPP;
-
- req = fuse_get_req(fc);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
- req->in.h.opcode = FUSE_REMOVEXATTR;
- req->in.h.nodeid = get_node_id(inode);
- req->in.numargs = 1;
- req->in.args[0].size = strlen(name) + 1;
- req->in.args[0].value = name;
- fuse_request_send(fc, req);
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (err == -ENOSYS) {
- fc->no_removexattr = 1;
- err = -EOPNOTSUPP;
- }
- return err;
-}
-
-static const struct inode_operations fuse_dir_inode_operations = {
- .lookup = fuse_lookup,
- .mkdir = fuse_mkdir,
- .symlink = fuse_symlink,
- .unlink = fuse_unlink,
- .rmdir = fuse_rmdir,
- .rename = fuse_rename,
- .link = fuse_link,
- .setattr = fuse_setattr,
- .create = fuse_create,
- .mknod = fuse_mknod,
- .permission = fuse_permission,
- .getattr = fuse_getattr,
- .setxattr = fuse_setxattr,
- .getxattr = fuse_getxattr,
- .listxattr = fuse_listxattr,
- .removexattr = fuse_removexattr,
-};
-
-static const struct file_operations fuse_dir_operations = {
- .llseek = generic_file_llseek,
- .read = generic_read_dir,
- .readdir = fuse_readdir,
- .open = fuse_dir_open,
- .release = fuse_dir_release,
- .fsync = fuse_dir_fsync,
- .unlocked_ioctl = fuse_dir_ioctl,
- .compat_ioctl = fuse_dir_compat_ioctl,
-};
-
-static const struct inode_operations fuse_common_inode_operations = {
- .setattr = fuse_setattr,
- .permission = fuse_permission,
- .getattr = fuse_getattr,
- .setxattr = fuse_setxattr,
- .getxattr = fuse_getxattr,
- .listxattr = fuse_listxattr,
- .removexattr = fuse_removexattr,
-};
-
-static const struct inode_operations fuse_symlink_inode_operations = {
- .setattr = fuse_setattr,
- .follow_link = fuse_follow_link,
- .put_link = fuse_put_link,
- .readlink = generic_readlink,
- .getattr = fuse_getattr,
- .setxattr = fuse_setxattr,
- .getxattr = fuse_getxattr,
- .listxattr = fuse_listxattr,
- .removexattr = fuse_removexattr,
-};
-
-void fuse_init_common(struct inode *inode)
-{
- inode->i_op = &fuse_common_inode_operations;
-}
-
-void fuse_init_dir(struct inode *inode)
-{
- inode->i_op = &fuse_dir_inode_operations;
- inode->i_fop = &fuse_dir_operations;
-}
-
-void fuse_init_symlink(struct inode *inode)
-{
- inode->i_op = &fuse_symlink_inode_operations;
-}