From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/fs/fuse/dir.c | 983 +++++++++++++++++++++++++++++----------------------------
1 files changed, 500 insertions(+), 483 deletions(-)
diff --git a/kernel/fs/fuse/dir.c b/kernel/fs/fuse/dir.c
index 2bc20cd..34a4a0e 100644
--- a/kernel/fs/fuse/dir.c
+++ b/kernel/fs/fuse/dir.c
@@ -10,27 +10,13 @@
#include <linux/pagemap.h>
#include <linux/file.h>
+#include <linux/fs_context.h>
#include <linux/sched.h>
#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/xattr.h>
+#include <linux/iversion.h>
#include <linux/posix_acl.h>
-
-static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx)
-{
- struct fuse_conn *fc = get_fuse_conn(dir);
- struct fuse_inode *fi = get_fuse_inode(dir);
-
- if (!fc->do_readdirplus)
- return false;
- if (!fc->readdirplus_auto)
- return true;
- if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
- return true;
- if (ctx->pos == 0)
- return true;
- return false;
-}
static void fuse_advise_use_readdirplus(struct inode *dir)
{
@@ -39,19 +25,53 @@
set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);
}
+#if BITS_PER_LONG >= 64
+static inline void __fuse_dentry_settime(struct dentry *entry, u64 time)
+{
+ entry->d_fsdata = (void *) time;
+}
+
+static inline u64 fuse_dentry_time(const struct dentry *entry)
+{
+ return (u64)entry->d_fsdata;
+}
+
+#else
union fuse_dentry {
u64 time;
struct rcu_head rcu;
};
-static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
+static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time)
{
- ((union fuse_dentry *) entry->d_fsdata)->time = time;
+ ((union fuse_dentry *) dentry->d_fsdata)->time = time;
}
-static inline u64 fuse_dentry_time(struct dentry *entry)
+static inline u64 fuse_dentry_time(const struct dentry *entry)
{
return ((union fuse_dentry *) entry->d_fsdata)->time;
+}
+#endif
+
+static void fuse_dentry_settime(struct dentry *dentry, u64 time)
+{
+ struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb);
+ bool delete = !time && fc->delete_stale;
+ /*
+ * Mess with DCACHE_OP_DELETE because dput() will be faster without it.
+ * Don't care about races, either way it's just an optimization
+ */
+ if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) ||
+ (delete && !(dentry->d_flags & DCACHE_OP_DELETE))) {
+ spin_lock(&dentry->d_lock);
+ if (!delete)
+ dentry->d_flags &= ~DCACHE_OP_DELETE;
+ else
+ dentry->d_flags |= DCACHE_OP_DELETE;
+ spin_unlock(&dentry->d_lock);
+ }
+
+ __fuse_dentry_settime(dentry, time);
}
/*
@@ -80,8 +100,7 @@
* 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)
+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));
@@ -92,9 +111,14 @@
return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
}
-static u64 entry_attr_timeout(struct fuse_entry_out *o)
+u64 entry_attr_timeout(struct fuse_entry_out *o)
{
return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
+}
+
+static void fuse_invalidate_attr_mask(struct inode *inode, u32 mask)
+{
+ set_mask_bits(&get_fuse_inode(inode)->inval_mask, 0, mask);
}
/*
@@ -103,7 +127,13 @@
*/
void fuse_invalidate_attr(struct inode *inode)
{
- get_fuse_inode(inode)->i_time = 0;
+ fuse_invalidate_attr_mask(inode, STATX_BASIC_STATS);
+}
+
+static void fuse_dir_changed(struct inode *dir)
+{
+ fuse_invalidate_attr(dir);
+ inode_maybe_inc_iversion(dir, false);
}
/**
@@ -113,7 +143,7 @@
void fuse_invalidate_atime(struct inode *inode)
{
if (!IS_RDONLY(inode))
- fuse_invalidate_attr(inode);
+ fuse_invalidate_attr_mask(inode, STATX_ATIME);
}
/*
@@ -144,29 +174,14 @@
struct fuse_entry_out *outarg)
{
memset(outarg, 0, sizeof(struct fuse_entry_out));
- args->in.h.opcode = FUSE_LOOKUP;
- args->in.h.nodeid = nodeid;
- args->in.numargs = 1;
- args->in.args[0].size = name->len + 1;
- args->in.args[0].value = name->name;
- args->out.numargs = 1;
- args->out.args[0].size = sizeof(struct fuse_entry_out);
- args->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;
+ args->opcode = FUSE_LOOKUP;
+ args->nodeid = nodeid;
+ args->in_numargs = 1;
+ args->in_args[0].size = name->len + 1;
+ args->in_args[0].value = name->name;
+ args->out_numargs = 1;
+ args->out_args[0].size = sizeof(struct fuse_entry_out);
+ args->out_args[0].value = outarg;
}
/*
@@ -182,7 +197,7 @@
{
struct inode *inode;
struct dentry *parent;
- struct fuse_conn *fc;
+ struct fuse_mount *fm;
struct fuse_inode *fi;
int ret;
@@ -190,7 +205,7 @@
if (inode && fuse_is_bad(inode))
goto invalid;
else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
- (flags & LOOKUP_REVAL)) {
+ (flags & (LOOKUP_EXCL | LOOKUP_REVAL | LOOKUP_RENAME_TARGET))) {
struct fuse_entry_out outarg;
FUSE_ARGS(args);
struct fuse_forget_link *forget;
@@ -204,38 +219,40 @@
if (flags & LOOKUP_RCU)
goto out;
- fc = get_fuse_conn(inode);
+ fm = get_fuse_mount(inode);
forget = fuse_alloc_forget();
ret = -ENOMEM;
if (!forget)
goto out;
- attr_version = fuse_get_attr_version(fc);
+ attr_version = fuse_get_attr_version(fm->fc);
parent = dget_parent(entry);
- fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)),
+ fuse_lookup_init(fm->fc, &args, get_node_id(d_inode(parent)),
&entry->d_name, &outarg);
- ret = fuse_simple_request(fc, &args);
+ ret = fuse_simple_request(fm, &args);
dput(parent);
/* Zero nodeid is same as -ENOENT */
if (!ret && !outarg.nodeid)
ret = -ENOENT;
if (!ret) {
fi = get_fuse_inode(inode);
- if (outarg.nodeid != get_node_id(inode)) {
- fuse_queue_forget(fc, forget, outarg.nodeid, 1);
+ if (outarg.nodeid != get_node_id(inode) ||
+ (bool) IS_AUTOMOUNT(inode) != (bool) (outarg.attr.flags & FUSE_ATTR_SUBMOUNT)) {
+ fuse_queue_forget(fm->fc, forget,
+ outarg.nodeid, 1);
goto invalid;
}
- spin_lock(&fc->lock);
+ spin_lock(&fi->lock);
fi->nlookup++;
- spin_unlock(&fc->lock);
+ spin_unlock(&fi->lock);
}
kfree(forget);
- if (ret == -ENOMEM)
+ if (ret == -ENOMEM || ret == -EINTR)
goto out;
if (ret || fuse_invalid_attr(&outarg.attr) ||
- (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
+ fuse_stale_inode(inode, outarg.generation, &outarg.attr))
goto invalid;
forget_all_cached_acls(inode);
@@ -263,14 +280,11 @@
goto out;
}
-static int invalid_nodeid(u64 nodeid)
-{
- return !nodeid || nodeid == FUSE_ROOT_ID;
-}
-
+#if BITS_PER_LONG < 64
static int fuse_dentry_init(struct dentry *dentry)
{
- dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry), GFP_KERNEL);
+ dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry),
+ GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE);
return dentry->d_fsdata ? 0 : -ENOMEM;
}
@@ -279,6 +293,100 @@
union fuse_dentry *fd = dentry->d_fsdata;
kfree_rcu(fd, rcu);
+}
+#endif
+
+static int fuse_dentry_delete(const struct dentry *dentry)
+{
+ return time_before64(fuse_dentry_time(dentry), get_jiffies_64());
+}
+
+/*
+ * Create a fuse_mount object with a new superblock (with path->dentry
+ * as the root), and return that mount so it can be auto-mounted on
+ * @path.
+ */
+static struct vfsmount *fuse_dentry_automount(struct path *path)
+{
+ struct fs_context *fsc;
+ struct fuse_mount *parent_fm = get_fuse_mount_super(path->mnt->mnt_sb);
+ struct fuse_conn *fc = parent_fm->fc;
+ struct fuse_mount *fm;
+ struct vfsmount *mnt;
+ struct fuse_inode *mp_fi = get_fuse_inode(d_inode(path->dentry));
+ struct super_block *sb;
+ int err;
+
+ fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry);
+ if (IS_ERR(fsc)) {
+ err = PTR_ERR(fsc);
+ goto out;
+ }
+
+ err = -ENOMEM;
+ fm = kzalloc(sizeof(struct fuse_mount), GFP_KERNEL);
+ if (!fm)
+ goto out_put_fsc;
+
+ refcount_set(&fm->count, 1);
+ fsc->s_fs_info = fm;
+ sb = sget_fc(fsc, NULL, set_anon_super_fc);
+ if (IS_ERR(sb)) {
+ err = PTR_ERR(sb);
+ fuse_mount_put(fm);
+ goto out_put_fsc;
+ }
+ fm->fc = fuse_conn_get(fc);
+
+ /* Initialize superblock, making @mp_fi its root */
+ err = fuse_fill_super_submount(sb, mp_fi);
+ if (err) {
+ fuse_conn_put(fc);
+ kfree(fm);
+ sb->s_fs_info = NULL;
+ goto out_put_sb;
+ }
+
+ down_write(&fc->killsb);
+ list_add_tail(&fm->fc_entry, &fc->mounts);
+ up_write(&fc->killsb);
+
+ sb->s_flags |= SB_ACTIVE;
+ fsc->root = dget(sb->s_root);
+
+ /*
+ * FIXME: setting SB_BORN requires a write barrier for
+ * super_cache_count(). We should actually come
+ * up with a proper ->get_tree() implementation
+ * for submounts and call vfs_get_tree() to take
+ * care of the write barrier.
+ */
+ smp_wmb();
+ sb->s_flags |= SB_BORN;
+
+ /* We are done configuring the superblock, so unlock it */
+ up_write(&sb->s_umount);
+
+ /* Create the submount */
+ mnt = vfs_create_mount(fsc);
+ if (IS_ERR(mnt)) {
+ err = PTR_ERR(mnt);
+ goto out_put_fsc;
+ }
+ mntget(mnt);
+ put_fs_context(fsc);
+ return mnt;
+
+out_put_sb:
+ /*
+ * Only jump here when fsc->root is NULL and sb is still locked
+ * (otherwise put_fs_context() will put the superblock)
+ */
+ deactivate_locked_super(sb);
+out_put_fsc:
+ put_fs_context(fsc);
+out:
+ return ERR_PTR(err);
}
/*
@@ -291,25 +399,26 @@
struct path *canonical_path)
{
struct inode *inode = d_inode(path->dentry);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ //struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount_super(path->mnt->mnt_sb);
FUSE_ARGS(args);
char *path_name;
int err;
- path_name = (char *)__get_free_page(GFP_KERNEL);
+ path_name = (char *)get_zeroed_page(GFP_KERNEL);
if (!path_name)
goto default_path;
- args.in.h.opcode = FUSE_CANONICAL_PATH;
- args.in.h.nodeid = get_node_id(inode);
- args.in.numargs = 0;
- args.out.numargs = 1;
- args.out.args[0].size = PATH_MAX;
- args.out.args[0].value = path_name;
- args.out.argvar = 1;
- args.out.canonical_path = canonical_path;
+ args.opcode = FUSE_CANONICAL_PATH;
+ args.nodeid = get_node_id(inode);
+ args.in_numargs = 0;
+ args.out_numargs = 1;
+ args.out_args[0].size = PATH_MAX;
+ args.out_args[0].value = path_name;
+ args.canonical_path = canonical_path;
+ args.out_argvar = 1;
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
free_page((unsigned long)path_name);
if (err > 0)
return;
@@ -321,14 +430,20 @@
const struct dentry_operations fuse_dentry_operations = {
.d_revalidate = fuse_dentry_revalidate,
+ .d_delete = fuse_dentry_delete,
+#if BITS_PER_LONG < 64
.d_init = fuse_dentry_init,
.d_release = fuse_dentry_release,
+#endif
+ .d_automount = fuse_dentry_automount,
.d_canonical_path = fuse_dentry_canonical_path,
};
const struct dentry_operations fuse_root_dentry_operations = {
+#if BITS_PER_LONG < 64
.d_init = fuse_dentry_init,
.d_release = fuse_dentry_release,
+#endif
};
int fuse_valid_type(int m)
@@ -346,7 +461,7 @@
int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
struct fuse_entry_out *outarg, struct inode **inode)
{
- struct fuse_conn *fc = get_fuse_conn_super(sb);
+ struct fuse_mount *fm = get_fuse_mount_super(sb);
FUSE_ARGS(args);
struct fuse_forget_link *forget;
u64 attr_version;
@@ -363,10 +478,10 @@
if (!forget)
goto out;
- attr_version = fuse_get_attr_version(fc);
+ attr_version = fuse_get_attr_version(fm->fc);
- fuse_lookup_init(fc, &args, nodeid, name, outarg);
- err = fuse_simple_request(fc, &args);
+ fuse_lookup_init(fm->fc, &args, nodeid, name, outarg);
+ err = fuse_simple_request(fm, &args);
/* Zero nodeid is same as -ENOENT, but with valid timeout */
if (err || !outarg->nodeid)
goto out_put_forget;
@@ -382,7 +497,7 @@
attr_version);
err = -ENOMEM;
if (!*inode) {
- fuse_queue_forget(fc, forget, outarg->nodeid, 1);
+ fuse_queue_forget(fm->fc, forget, outarg->nodeid, 1);
goto out;
}
err = 0;
@@ -432,7 +547,8 @@
else
fuse_invalidate_entry_cache(entry);
- fuse_advise_use_readdirplus(dir);
+ if (inode)
+ fuse_advise_use_readdirplus(dir);
return newent;
out_iput:
@@ -454,12 +570,15 @@
int err;
struct inode *inode;
struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
struct fuse_forget_link *forget;
struct fuse_create_in inarg;
struct fuse_open_out outopen;
struct fuse_entry_out outentry;
+ struct fuse_inode *fi;
struct fuse_file *ff;
+ bool trunc = flags & O_TRUNC;
/* Userspace expects S_IFREG in create mode */
BUG_ON((mode & S_IFMT) != S_IFREG);
@@ -470,11 +589,11 @@
goto out_err;
err = -ENOMEM;
- ff = fuse_file_alloc(fc);
+ ff = fuse_file_alloc(fm);
if (!ff)
goto out_put_forget_req;
- if (!fc->dont_mask)
+ if (!fm->fc->dont_mask)
mode &= ~current_umask();
flags &= ~O_NOCTTY;
@@ -483,19 +602,19 @@
inarg.flags = flags;
inarg.mode = mode;
inarg.umask = current_umask();
- args.in.h.opcode = FUSE_CREATE;
- args.in.h.nodeid = get_node_id(dir);
- args.in.numargs = 2;
- args.in.args[0].size = sizeof(inarg);
- args.in.args[0].value = &inarg;
- args.in.args[1].size = entry->d_name.len + 1;
- args.in.args[1].value = entry->d_name.name;
- args.out.numargs = 2;
- args.out.args[0].size = sizeof(outentry);
- args.out.args[0].value = &outentry;
- args.out.args[1].size = sizeof(outopen);
- args.out.args[1].value = &outopen;
- err = fuse_simple_request(fc, &args);
+ args.opcode = FUSE_CREATE;
+ args.nodeid = get_node_id(dir);
+ args.in_numargs = 2;
+ args.in_args[0].size = sizeof(inarg);
+ args.in_args[0].value = &inarg;
+ args.in_args[1].size = entry->d_name.len + 1;
+ args.in_args[1].value = entry->d_name.name;
+ args.out_numargs = 2;
+ args.out_args[0].size = sizeof(outentry);
+ args.out_args[0].value = &outentry;
+ args.out_args[1].size = sizeof(outopen);
+ args.out_args[1].value = &outopen;
+ err = fuse_simple_request(fm, &args);
if (err)
goto out_free_ff;
@@ -507,25 +626,31 @@
ff->fh = outopen.fh;
ff->nodeid = outentry.nodeid;
ff->open_flags = outopen.open_flags;
+ fuse_passthrough_setup(fc, ff, &outopen);
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);
+ fuse_sync_release(NULL, ff, flags);
+ fuse_queue_forget(fm->fc, forget, outentry.nodeid, 1);
err = -ENOMEM;
goto out_err;
}
kfree(forget);
d_instantiate(entry, inode);
fuse_change_entry_timeout(entry, &outentry);
- fuse_invalidate_attr(dir);
+ fuse_dir_changed(dir);
err = finish_open(file, entry, generic_file_open);
if (err) {
- fuse_sync_release(ff, flags);
+ fi = get_fuse_inode(inode);
+ fuse_sync_release(fi, ff, flags);
} else {
file->private_data = ff;
fuse_finish_open(inode, file);
+ if (fm->fc->atomic_o_trunc && trunc)
+ truncate_pagecache(inode, 0);
+ else if (!(ff->open_flags & FOPEN_KEEP_CACHE))
+ invalidate_inode_pages2(inode->i_mapping);
}
return err;
@@ -587,7 +712,7 @@
/*
* Code shared between mknod, mkdir, symlink and link
*/
-static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
+static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args,
struct inode *dir, struct dentry *entry,
umode_t mode)
{
@@ -605,11 +730,11 @@
return -ENOMEM;
memset(&outarg, 0, sizeof(outarg));
- args->in.h.nodeid = get_node_id(dir);
- args->out.numargs = 1;
- args->out.args[0].size = sizeof(outarg);
- args->out.args[0].value = &outarg;
- err = fuse_simple_request(fc, args);
+ args->nodeid = get_node_id(dir);
+ args->out_numargs = 1;
+ args->out_args[0].size = sizeof(outarg);
+ args->out_args[0].value = &outarg;
+ err = fuse_simple_request(fm, args);
if (err)
goto out_put_forget_req;
@@ -623,7 +748,7 @@
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);
+ fuse_queue_forget(fm->fc, forget, outarg.nodeid, 1);
return -ENOMEM;
}
kfree(forget);
@@ -639,7 +764,7 @@
} else {
fuse_change_entry_timeout(entry, &outarg);
}
- fuse_invalidate_attr(dir);
+ fuse_dir_changed(dir);
return 0;
out_put_forget_req:
@@ -651,23 +776,23 @@
dev_t rdev)
{
struct fuse_mknod_in inarg;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
- if (!fc->dont_mask)
+ if (!fm->fc->dont_mask)
mode &= ~current_umask();
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
inarg.rdev = new_encode_dev(rdev);
inarg.umask = current_umask();
- args.in.h.opcode = FUSE_MKNOD;
- args.in.numargs = 2;
- args.in.args[0].size = sizeof(inarg);
- args.in.args[0].value = &inarg;
- args.in.args[1].size = entry->d_name.len + 1;
- args.in.args[1].value = entry->d_name.name;
- return create_new_entry(fc, &args, dir, entry, mode);
+ args.opcode = FUSE_MKNOD;
+ args.in_numargs = 2;
+ args.in_args[0].size = sizeof(inarg);
+ args.in_args[0].value = &inarg;
+ args.in_args[1].size = entry->d_name.len + 1;
+ args.in_args[1].value = entry->d_name.name;
+ return create_new_entry(fm, &args, dir, entry, mode);
}
static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
@@ -679,38 +804,45 @@
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_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
- if (!fc->dont_mask)
+ if (!fm->fc->dont_mask)
mode &= ~current_umask();
memset(&inarg, 0, sizeof(inarg));
inarg.mode = mode;
inarg.umask = current_umask();
- args.in.h.opcode = FUSE_MKDIR;
- args.in.numargs = 2;
- args.in.args[0].size = sizeof(inarg);
- args.in.args[0].value = &inarg;
- args.in.args[1].size = entry->d_name.len + 1;
- args.in.args[1].value = entry->d_name.name;
- return create_new_entry(fc, &args, dir, entry, S_IFDIR);
+ args.opcode = FUSE_MKDIR;
+ args.in_numargs = 2;
+ args.in_args[0].size = sizeof(inarg);
+ args.in_args[0].value = &inarg;
+ args.in_args[1].size = entry->d_name.len + 1;
+ args.in_args[1].value = entry->d_name.name;
+ return create_new_entry(fm, &args, 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);
+ struct fuse_mount *fm = get_fuse_mount(dir);
unsigned len = strlen(link) + 1;
FUSE_ARGS(args);
- args.in.h.opcode = FUSE_SYMLINK;
- args.in.numargs = 2;
- args.in.args[0].size = entry->d_name.len + 1;
- args.in.args[0].value = entry->d_name.name;
- args.in.args[1].size = len;
- args.in.args[1].value = link;
- return create_new_entry(fc, &args, dir, entry, S_IFLNK);
+ args.opcode = FUSE_SYMLINK;
+ args.in_numargs = 2;
+ args.in_args[0].size = entry->d_name.len + 1;
+ args.in_args[0].value = entry->d_name.name;
+ args.in_args[1].size = len;
+ args.in_args[1].value = link;
+ return create_new_entry(fm, &args, dir, entry, S_IFLNK);
+}
+
+void fuse_flush_time_update(struct inode *inode)
+{
+ int err = sync_inode_metadata(inode, 1);
+
+ mapping_set_error(inode->i_mapping, err);
}
void fuse_update_ctime(struct inode *inode)
@@ -718,30 +850,31 @@
if (!IS_NOCMTIME(inode)) {
inode->i_ctime = current_time(inode);
mark_inode_dirty_sync(inode);
+ fuse_flush_time_update(inode);
}
}
static int fuse_unlink(struct inode *dir, struct dentry *entry)
{
int err;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
if (fuse_is_bad(dir))
return -EIO;
- args.in.h.opcode = FUSE_UNLINK;
- args.in.h.nodeid = get_node_id(dir);
- args.in.numargs = 1;
- args.in.args[0].size = entry->d_name.len + 1;
- args.in.args[0].value = entry->d_name.name;
- err = fuse_simple_request(fc, &args);
+ args.opcode = FUSE_UNLINK;
+ args.nodeid = get_node_id(dir);
+ args.in_numargs = 1;
+ args.in_args[0].size = entry->d_name.len + 1;
+ args.in_args[0].value = entry->d_name.name;
+ err = fuse_simple_request(fm, &args);
if (!err) {
struct inode *inode = d_inode(entry);
struct fuse_inode *fi = get_fuse_inode(inode);
- spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
+ spin_lock(&fi->lock);
+ fi->attr_version = atomic64_inc_return(&fm->fc->attr_version);
/*
* If i_nlink == 0 then unlink doesn't make sense, yet this can
* happen if userspace filesystem is careless. It would be
@@ -750,9 +883,9 @@
*/
if (inode->i_nlink > 0)
drop_nlink(inode);
- spin_unlock(&fc->lock);
+ spin_unlock(&fi->lock);
fuse_invalidate_attr(inode);
- fuse_invalidate_attr(dir);
+ fuse_dir_changed(dir);
fuse_invalidate_entry_cache(entry);
fuse_update_ctime(inode);
} else if (err == -EINTR)
@@ -763,21 +896,21 @@
static int fuse_rmdir(struct inode *dir, struct dentry *entry)
{
int err;
- struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_mount *fm = get_fuse_mount(dir);
FUSE_ARGS(args);
if (fuse_is_bad(dir))
return -EIO;
- args.in.h.opcode = FUSE_RMDIR;
- args.in.h.nodeid = get_node_id(dir);
- args.in.numargs = 1;
- args.in.args[0].size = entry->d_name.len + 1;
- args.in.args[0].value = entry->d_name.name;
- err = fuse_simple_request(fc, &args);
+ args.opcode = FUSE_RMDIR;
+ args.nodeid = get_node_id(dir);
+ args.in_numargs = 1;
+ args.in_args[0].size = entry->d_name.len + 1;
+ args.in_args[0].value = entry->d_name.name;
+ err = fuse_simple_request(fm, &args);
if (!err) {
clear_nlink(d_inode(entry));
- fuse_invalidate_attr(dir);
+ fuse_dir_changed(dir);
fuse_invalidate_entry_cache(entry);
} else if (err == -EINTR)
fuse_invalidate_entry(entry);
@@ -790,22 +923,22 @@
{
int err;
struct fuse_rename2_in inarg;
- struct fuse_conn *fc = get_fuse_conn(olddir);
+ struct fuse_mount *fm = get_fuse_mount(olddir);
FUSE_ARGS(args);
memset(&inarg, 0, argsize);
inarg.newdir = get_node_id(newdir);
inarg.flags = flags;
- args.in.h.opcode = opcode;
- args.in.h.nodeid = get_node_id(olddir);
- args.in.numargs = 3;
- args.in.args[0].size = argsize;
- args.in.args[0].value = &inarg;
- args.in.args[1].size = oldent->d_name.len + 1;
- args.in.args[1].value = oldent->d_name.name;
- args.in.args[2].size = newent->d_name.len + 1;
- args.in.args[2].value = newent->d_name.name;
- err = fuse_simple_request(fc, &args);
+ args.opcode = opcode;
+ args.nodeid = get_node_id(olddir);
+ args.in_numargs = 3;
+ args.in_args[0].size = argsize;
+ args.in_args[0].value = &inarg;
+ args.in_args[1].size = oldent->d_name.len + 1;
+ args.in_args[1].value = oldent->d_name.name;
+ args.in_args[2].size = newent->d_name.len + 1;
+ args.in_args[2].value = newent->d_name.name;
+ err = fuse_simple_request(fm, &args);
if (!err) {
/* ctime changes */
fuse_invalidate_attr(d_inode(oldent));
@@ -816,9 +949,9 @@
fuse_update_ctime(d_inode(newent));
}
- fuse_invalidate_attr(olddir);
+ fuse_dir_changed(olddir);
if (olddir != newdir)
- fuse_invalidate_attr(newdir);
+ fuse_dir_changed(newdir);
/* newent will end up negative */
if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) {
@@ -850,7 +983,7 @@
if (fuse_is_bad(olddir))
return -EIO;
- if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
+ if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
return -EINVAL;
if (flags) {
@@ -879,18 +1012,18 @@
int err;
struct fuse_link_in inarg;
struct inode *inode = d_inode(entry);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
memset(&inarg, 0, sizeof(inarg));
inarg.oldnodeid = get_node_id(inode);
- args.in.h.opcode = FUSE_LINK;
- args.in.numargs = 2;
- args.in.args[0].size = sizeof(inarg);
- args.in.args[0].value = &inarg;
- args.in.args[1].size = newent->d_name.len + 1;
- args.in.args[1].value = newent->d_name.name;
- err = create_new_entry(fc, &args, newdir, newent, inode->i_mode);
+ args.opcode = FUSE_LINK;
+ args.in_numargs = 2;
+ args.in_args[0].size = sizeof(inarg);
+ args.in_args[0].value = &inarg;
+ args.in_args[1].size = newent->d_name.len + 1;
+ args.in_args[1].value = newent->d_name.name;
+ err = create_new_entry(fm, &args, 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
@@ -900,11 +1033,11 @@
if (!err) {
struct fuse_inode *fi = get_fuse_inode(inode);
- spin_lock(&fc->lock);
- fi->attr_version = ++fc->attr_version;
+ spin_lock(&fi->lock);
+ fi->attr_version = atomic64_inc_return(&fm->fc->attr_version);
if (likely(inode->i_nlink < UINT_MAX))
inc_nlink(inode);
- spin_unlock(&fc->lock);
+ spin_unlock(&fi->lock);
fuse_invalidate_attr(inode);
fuse_update_ctime(inode);
} else if (err == -EINTR) {
@@ -958,11 +1091,11 @@
int err;
struct fuse_getattr_in inarg;
struct fuse_attr_out outarg;
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
u64 attr_version;
- attr_version = fuse_get_attr_version(fc);
+ attr_version = fuse_get_attr_version(fm->fc);
memset(&inarg, 0, sizeof(inarg));
memset(&outarg, 0, sizeof(outarg));
@@ -973,18 +1106,18 @@
inarg.getattr_flags |= FUSE_GETATTR_FH;
inarg.fh = ff->fh;
}
- args.in.h.opcode = FUSE_GETATTR;
- args.in.h.nodeid = get_node_id(inode);
- args.in.numargs = 1;
- args.in.args[0].size = sizeof(inarg);
- args.in.args[0].value = &inarg;
- args.out.numargs = 1;
- args.out.args[0].size = sizeof(outarg);
- args.out.args[0].value = &outarg;
- err = fuse_simple_request(fc, &args);
+ args.opcode = FUSE_GETATTR;
+ args.nodeid = get_node_id(inode);
+ args.in_numargs = 1;
+ args.in_args[0].size = sizeof(inarg);
+ args.in_args[0].value = &inarg;
+ args.out_numargs = 1;
+ args.out_args[0].size = sizeof(outarg);
+ args.out_args[0].value = &outarg;
+ err = fuse_simple_request(fm, &args);
if (!err) {
if (fuse_invalid_attr(&outarg.attr) ||
- (inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
+ inode_wrong_type(inode, outarg.attr.mode)) {
fuse_make_bad(inode);
err = -EIO;
} else {
@@ -999,7 +1132,8 @@
}
static int fuse_update_get_attr(struct inode *inode, struct file *file,
- struct kstat *stat, unsigned int flags)
+ struct kstat *stat, u32 request_mask,
+ unsigned int flags)
{
struct fuse_inode *fi = get_fuse_inode(inode);
int err = 0;
@@ -1009,6 +1143,8 @@
sync = true;
else if (flags & AT_STATX_DONT_SYNC)
sync = false;
+ else if (request_mask & READ_ONCE(fi->inval_mask))
+ sync = true;
else
sync = time_before64(fi->i_time, get_jiffies_64());
@@ -1026,10 +1162,12 @@
int fuse_update_attributes(struct inode *inode, struct file *file)
{
- return fuse_update_get_attr(inode, file, NULL, 0);
+ /* Do *not* need to get atime for internal purposes */
+ return fuse_update_get_attr(inode, file, NULL,
+ STATX_BASIC_STATS & ~STATX_ATIME, 0);
}
-int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
+int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
u64 child_nodeid, struct qstr *name)
{
int err = -ENOTDIR;
@@ -1037,7 +1175,7 @@
struct dentry *dir;
struct dentry *entry;
- parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
+ parent = fuse_ilookup(fc, parent_nodeid, NULL);
if (!parent)
return -ENOENT;
@@ -1056,7 +1194,7 @@
if (!entry)
goto unlock;
- fuse_invalidate_attr(parent);
+ fuse_dir_changed(parent);
fuse_invalidate_entry(entry);
if (child_nodeid != 0 && d_really_is_positive(entry)) {
@@ -1129,26 +1267,26 @@
static int fuse_access(struct inode *inode, int mask)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_access_in inarg;
int err;
BUG_ON(mask & MAY_NOT_BLOCK);
- if (fc->no_access)
+ if (fm->fc->no_access)
return 0;
memset(&inarg, 0, sizeof(inarg));
inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
- args.in.h.opcode = FUSE_ACCESS;
- args.in.h.nodeid = get_node_id(inode);
- args.in.numargs = 1;
- args.in.args[0].size = sizeof(inarg);
- args.in.args[0].value = &inarg;
- err = fuse_simple_request(fc, &args);
+ args.opcode = FUSE_ACCESS;
+ args.nodeid = get_node_id(inode);
+ args.in_numargs = 1;
+ args.in_args[0].size = sizeof(inarg);
+ args.in_args[0].value = &inarg;
+ err = fuse_simple_request(fm, &args);
if (err == -ENOSYS) {
- fc->no_access = 1;
+ fm->fc->no_access = 1;
err = 0;
}
return err;
@@ -1194,8 +1332,10 @@
if (fc->default_permissions ||
((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
struct fuse_inode *fi = get_fuse_inode(inode);
+ u32 perm_mask = STATX_MODE | STATX_UID | STATX_GID;
- if (time_before64(fi->i_time, get_jiffies_64())) {
+ if (perm_mask & READ_ONCE(fi->inval_mask) ||
+ time_before64(fi->i_time, get_jiffies_64())) {
refreshed = true;
err = fuse_perm_getattr(inode, mask);
@@ -1235,274 +1375,76 @@
return err;
}
-static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
- struct dir_context *ctx)
+static int fuse_readlink_page(struct inode *inode, struct page *page)
{
- while (nbytes >= FUSE_NAME_OFFSET) {
- struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
- size_t reclen = FUSE_DIRENT_SIZE(dirent);
- if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
- return -EIO;
- if (reclen > nbytes)
- break;
- if (memchr(dirent->name, '/', dirent->namelen) != NULL)
- return -EIO;
+ struct fuse_mount *fm = get_fuse_mount(inode);
+ struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 };
+ struct fuse_args_pages ap = {
+ .num_pages = 1,
+ .pages = &page,
+ .descs = &desc,
+ };
+ char *link;
+ ssize_t res;
- if (!dir_emit(ctx, dirent->name, dirent->namelen,
- dirent->ino, dirent->type))
- break;
+ ap.args.opcode = FUSE_READLINK;
+ ap.args.nodeid = get_node_id(inode);
+ ap.args.out_pages = true;
+ ap.args.out_argvar = true;
+ ap.args.page_zeroing = true;
+ ap.args.out_numargs = 1;
+ ap.args.out_args[0].size = desc.length;
+ res = fuse_simple_request(fm, &ap.args);
- buf += reclen;
- nbytes -= reclen;
- ctx->pos = dirent->off;
- }
+ fuse_invalidate_atime(inode);
- return 0;
-}
+ if (res < 0)
+ return res;
-static int fuse_direntplus_link(struct file *file,
- struct fuse_direntplus *direntplus,
- u64 attr_version)
-{
- struct fuse_entry_out *o = &direntplus->entry_out;
- struct fuse_dirent *dirent = &direntplus->dirent;
- struct dentry *parent = file->f_path.dentry;
- struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
- struct dentry *dentry;
- struct dentry *alias;
- struct inode *dir = d_inode(parent);
- struct fuse_conn *fc;
- struct inode *inode;
- DECLARE_SWAIT_QUEUE_HEAD_ONSTACK(wq);
-
- if (!o->nodeid) {
- /*
- * Unlike in the case of fuse_lookup, zero nodeid does not mean
- * ENOENT. Instead, it only means the userspace filesystem did
- * not want to return attributes/handle for this entry.
- *
- * So do nothing.
- */
- return 0;
- }
-
- if (name.name[0] == '.') {
- /*
- * We could potentially refresh the attributes of the directory
- * and its parent?
- */
- if (name.len == 1)
- return 0;
- if (name.name[1] == '.' && name.len == 2)
- return 0;
- }
-
- if (invalid_nodeid(o->nodeid))
- return -EIO;
- if (fuse_invalid_attr(&o->attr))
+ if (WARN_ON(res >= PAGE_SIZE))
return -EIO;
- fc = get_fuse_conn(dir);
-
- name.hash = full_name_hash(parent, name.name, name.len);
- dentry = d_lookup(parent, &name);
- if (!dentry) {
-retry:
- dentry = d_alloc_parallel(parent, &name, &wq);
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
- }
- if (!d_in_lookup(dentry)) {
- struct fuse_inode *fi;
- inode = d_inode(dentry);
- if (!inode ||
- get_node_id(inode) != o->nodeid ||
- ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
- d_invalidate(dentry);
- dput(dentry);
- goto retry;
- }
- if (fuse_is_bad(inode)) {
- dput(dentry);
- return -EIO;
- }
-
- fi = get_fuse_inode(inode);
- spin_lock(&fc->lock);
- fi->nlookup++;
- spin_unlock(&fc->lock);
-
- forget_all_cached_acls(inode);
- fuse_change_attributes(inode, &o->attr,
- entry_attr_timeout(o),
- attr_version);
- /*
- * The other branch comes via fuse_iget()
- * which bumps nlookup inside
- */
- } else {
- inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
- &o->attr, entry_attr_timeout(o),
- attr_version);
- if (!inode)
- inode = ERR_PTR(-ENOMEM);
-
- alias = d_splice_alias(inode, dentry);
- d_lookup_done(dentry);
- if (alias) {
- dput(dentry);
- dentry = alias;
- }
- if (IS_ERR(dentry))
- return PTR_ERR(dentry);
- }
- if (fc->readdirplus_auto)
- set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
- fuse_change_entry_timeout(dentry, o);
-
- dput(dentry);
- return 0;
-}
-
-static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
- struct dir_context *ctx, u64 attr_version)
-{
- struct fuse_direntplus *direntplus;
- struct fuse_dirent *dirent;
- size_t reclen;
- int over = 0;
- int ret;
-
- while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
- direntplus = (struct fuse_direntplus *) buf;
- dirent = &direntplus->dirent;
- reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
-
- if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
- return -EIO;
- if (reclen > nbytes)
- break;
- if (memchr(dirent->name, '/', dirent->namelen) != NULL)
- return -EIO;
-
- if (!over) {
- /* We fill entries into dstbuf only as much as
- it can hold. But we still continue iterating
- over remaining entries to link them. If not,
- we need to send a FORGET for each of those
- which we did not link.
- */
- over = !dir_emit(ctx, dirent->name, dirent->namelen,
- dirent->ino, dirent->type);
- if (!over)
- ctx->pos = dirent->off;
- }
-
- buf += reclen;
- nbytes -= reclen;
-
- ret = fuse_direntplus_link(file, direntplus, attr_version);
- if (ret)
- fuse_force_forget(file, direntplus->entry_out.nodeid);
- }
+ link = page_address(page);
+ link[res] = '\0';
return 0;
}
-static int fuse_readdir(struct file *file, struct dir_context *ctx)
+static const char *fuse_get_link(struct dentry *dentry, struct inode *inode,
+ struct delayed_call *callback)
{
- int plus, err;
- size_t nbytes;
- struct page *page;
- struct inode *inode = file_inode(file);
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- u64 attr_version = 0;
- bool locked;
+ struct page *page;
+ int err;
+ err = -EIO;
if (fuse_is_bad(inode))
- return -EIO;
+ goto out_err;
- req = fuse_get_req(fc, 1);
- if (IS_ERR(req))
- return PTR_ERR(req);
+ if (fc->cache_symlinks)
+ return page_get_link(dentry, inode, callback);
+
+ err = -ECHILD;
+ if (!dentry)
+ goto out_err;
page = alloc_page(GFP_KERNEL);
- if (!page) {
- fuse_put_request(fc, req);
- return -ENOMEM;
+ err = -ENOMEM;
+ if (!page)
+ goto out_err;
+
+ err = fuse_readlink_page(inode, page);
+ if (err) {
+ __free_page(page);
+ goto out_err;
}
- plus = fuse_use_readdirplus(inode, ctx);
- req->out.argpages = 1;
- req->num_pages = 1;
- req->pages[0] = page;
- req->page_descs[0].length = PAGE_SIZE;
- if (plus) {
- attr_version = fuse_get_attr_version(fc);
- fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
- FUSE_READDIRPLUS);
- } else {
- fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
- FUSE_READDIR);
- }
- locked = fuse_lock_inode(inode);
- fuse_request_send(fc, req);
- fuse_unlock_inode(inode, locked);
- nbytes = req->out.args[0].size;
- err = req->out.h.error;
- fuse_put_request(fc, req);
- if (!err) {
- if (plus) {
- err = parse_dirplusfile(page_address(page), nbytes,
- file, ctx,
- attr_version);
- } else {
- err = parse_dirfile(page_address(page), nbytes, file,
- ctx);
- }
- }
+ set_delayed_call(callback, page_put_link, page);
- __free_page(page);
- fuse_invalidate_atime(inode);
- return err;
-}
+ return page_address(page);
-static const char *fuse_get_link(struct dentry *dentry,
- struct inode *inode,
- struct delayed_call *done)
-{
- struct fuse_conn *fc = get_fuse_conn(inode);
- FUSE_ARGS(args);
- char *link;
- ssize_t ret;
-
- if (!dentry)
- return ERR_PTR(-ECHILD);
-
- if (fuse_is_bad(inode))
- return ERR_PTR(-EIO);
-
- link = kmalloc(PAGE_SIZE, GFP_KERNEL);
- if (!link)
- return ERR_PTR(-ENOMEM);
-
- args.in.h.opcode = FUSE_READLINK;
- args.in.h.nodeid = get_node_id(inode);
- args.out.argvar = 1;
- args.out.numargs = 1;
- args.out.args[0].size = PAGE_SIZE - 1;
- args.out.args[0].value = link;
- ret = fuse_simple_request(fc, &args);
- if (ret < 0) {
- kfree(link);
- link = ERR_PTR(ret);
- } else {
- link[ret] = '\0';
- set_delayed_call(done, kfree_link, link);
- }
- fuse_invalidate_atime(inode);
- return link;
+out_err:
+ return ERR_PTR(err);
}
static int fuse_dir_open(struct inode *inode, struct file *file)
@@ -1520,7 +1462,25 @@
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);
+ struct inode *inode = file->f_mapping->host;
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ int err;
+
+ if (fuse_is_bad(inode))
+ return -EIO;
+
+ if (fc->no_fsyncdir)
+ return 0;
+
+ inode_lock(inode);
+ err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNCDIR);
+ if (err == -ENOSYS) {
+ fc->no_fsyncdir = 1;
+ err = 0;
+ }
+ inode_unlock(inode);
+
+ return err;
}
static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
@@ -1607,15 +1567,14 @@
*/
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(!inode_is_locked(inode));
- spin_lock(&fc->lock);
+ spin_lock(&fi->lock);
BUG_ON(fi->writectr < 0);
fi->writectr += FUSE_NOWRITE;
- spin_unlock(&fc->lock);
+ spin_unlock(&fi->lock);
wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
}
@@ -1636,11 +1595,11 @@
void fuse_release_nowrite(struct inode *inode)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_inode *fi = get_fuse_inode(inode);
- spin_lock(&fc->lock);
+ spin_lock(&fi->lock);
__fuse_release_nowrite(inode);
- spin_unlock(&fc->lock);
+ spin_unlock(&fi->lock);
}
static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args,
@@ -1648,14 +1607,14 @@
struct fuse_setattr_in *inarg_p,
struct fuse_attr_out *outarg_p)
{
- args->in.h.opcode = FUSE_SETATTR;
- args->in.h.nodeid = get_node_id(inode);
- args->in.numargs = 1;
- args->in.args[0].size = sizeof(*inarg_p);
- args->in.args[0].value = inarg_p;
- args->out.numargs = 1;
- args->out.args[0].size = sizeof(*outarg_p);
- args->out.args[0].value = outarg_p;
+ args->opcode = FUSE_SETATTR;
+ args->nodeid = get_node_id(inode);
+ args->in_numargs = 1;
+ args->in_args[0].size = sizeof(*inarg_p);
+ args->in_args[0].value = inarg_p;
+ args->out_numargs = 1;
+ args->out_args[0].size = sizeof(*outarg_p);
+ args->out_args[0].value = outarg_p;
}
/*
@@ -1663,7 +1622,7 @@
*/
int fuse_flush_times(struct inode *inode, struct fuse_file *ff)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
FUSE_ARGS(args);
struct fuse_setattr_in inarg;
struct fuse_attr_out outarg;
@@ -1674,7 +1633,7 @@
inarg.valid = FATTR_MTIME;
inarg.mtime = inode->i_mtime.tv_sec;
inarg.mtimensec = inode->i_mtime.tv_nsec;
- if (fc->minor >= 23) {
+ if (fm->fc->minor >= 23) {
inarg.valid |= FATTR_CTIME;
inarg.ctime = inode->i_ctime.tv_sec;
inarg.ctimensec = inode->i_ctime.tv_nsec;
@@ -1683,9 +1642,9 @@
inarg.valid |= FATTR_FH;
inarg.fh = ff->fh;
}
- fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
+ fuse_setattr_fill(fm->fc, &args, inode, &inarg, &outarg);
- return fuse_simple_request(fc, &args);
+ return fuse_simple_request(fm, &args);
}
/*
@@ -1700,7 +1659,8 @@
struct file *file)
{
struct inode *inode = d_inode(dentry);
- struct fuse_conn *fc = get_fuse_conn(inode);
+ struct fuse_mount *fm = get_fuse_mount(inode);
+ struct fuse_conn *fc = fm->fc;
struct fuse_inode *fi = get_fuse_inode(inode);
FUSE_ARGS(args);
struct fuse_setattr_in inarg;
@@ -1710,6 +1670,7 @@
loff_t oldsize;
int err;
bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);
+ bool fault_blocked = false;
if (!fc->default_permissions)
attr->ia_valid |= ATTR_FORCE;
@@ -1717,6 +1678,22 @@
err = setattr_prepare(dentry, attr);
if (err)
return err;
+
+ if (attr->ia_valid & ATTR_SIZE) {
+ if (WARN_ON(!S_ISREG(inode->i_mode)))
+ return -EIO;
+ is_truncate = true;
+ }
+
+ if (FUSE_IS_DAX(inode) && is_truncate) {
+ down_write(&fi->i_mmap_sem);
+ fault_blocked = true;
+ err = fuse_dax_break_layouts(inode, 0, 0);
+ if (err) {
+ up_write(&fi->i_mmap_sem);
+ return err;
+ }
+ }
if (attr->ia_valid & ATTR_OPEN) {
/* This is coming from open(..., ... | O_TRUNC); */
@@ -1730,13 +1707,10 @@
*/
i_size_write(inode, 0);
truncate_pagecache(inode, 0);
- return 0;
+ goto out;
}
file = NULL;
}
-
- if (attr->ia_valid & ATTR_SIZE)
- is_truncate = true;
/* Flush dirty data/metadata before non-truncate SETATTR */
if (is_wb && S_ISREG(inode->i_mode) &&
@@ -1772,7 +1746,7 @@
inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
}
fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
- err = fuse_simple_request(fc, &args);
+ err = fuse_simple_request(fm, &args);
if (err) {
if (err == -EINTR)
fuse_invalidate_attr(inode);
@@ -1780,13 +1754,13 @@
}
if (fuse_invalid_attr(&outarg.attr) ||
- (inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
+ inode_wrong_type(inode, outarg.attr.mode)) {
fuse_make_bad(inode);
err = -EIO;
goto error;
}
- spin_lock(&fc->lock);
+ spin_lock(&fi->lock);
/* the kernel maintains i_mtime locally */
if (trust_local_cmtime) {
if (attr->ia_valid & ATTR_MTIME)
@@ -1804,10 +1778,10 @@
i_size_write(inode, outarg.attr.size);
if (is_truncate) {
- /* NOTE: this may release/reacquire fc->lock */
+ /* NOTE: this may release/reacquire fi->lock */
__fuse_release_nowrite(inode);
}
- spin_unlock(&fc->lock);
+ spin_unlock(&fi->lock);
/*
* Only call invalidate_inode_pages2() after removing
@@ -1820,6 +1794,10 @@
}
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
+out:
+ if (fault_blocked)
+ up_write(&fi->i_mmap_sem);
+
return 0;
error:
@@ -1827,6 +1805,9 @@
fuse_release_nowrite(inode);
clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
+
+ if (fault_blocked)
+ up_write(&fi->i_mmap_sem);
return err;
}
@@ -1901,10 +1882,20 @@
if (fuse_is_bad(inode))
return -EIO;
- if (!fuse_allow_current_process(fc))
+ if (!fuse_allow_current_process(fc)) {
+ if (!request_mask) {
+ /*
+ * If user explicitly requested *nothing* then don't
+ * error out, but return st_dev only.
+ */
+ stat->result_mask = 0;
+ stat->dev = inode->i_sb->s_dev;
+ return 0;
+ }
return -EACCES;
+ }
- return fuse_update_get_attr(inode, NULL, stat, flags);
+ return fuse_update_get_attr(inode, NULL, stat, request_mask, flags);
}
static const struct inode_operations fuse_dir_inode_operations = {
@@ -1960,11 +1951,37 @@
void fuse_init_dir(struct inode *inode)
{
+ struct fuse_inode *fi = get_fuse_inode(inode);
+
inode->i_op = &fuse_dir_inode_operations;
inode->i_fop = &fuse_dir_operations;
+
+ spin_lock_init(&fi->rdc.lock);
+ fi->rdc.cached = false;
+ fi->rdc.size = 0;
+ fi->rdc.pos = 0;
+ fi->rdc.version = 0;
}
+
+static int fuse_symlink_readpage(struct file *null, struct page *page)
+{
+ int err = fuse_readlink_page(page->mapping->host, page);
+
+ if (!err)
+ SetPageUptodate(page);
+
+ unlock_page(page);
+
+ return err;
+}
+
+static const struct address_space_operations fuse_symlink_aops = {
+ .readpage = fuse_symlink_readpage,
+};
void fuse_init_symlink(struct inode *inode)
{
inode->i_op = &fuse_symlink_inode_operations;
+ inode->i_data.a_ops = &fuse_symlink_aops;
+ inode_nohighmem(inode);
}
--
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