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authorMiklos Szeredi <miklos@szeredi.hu>2005-11-07 00:59:51 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 07:53:42 -0800
commitfd72faac95d7e47610e981d7ed7b3c1529e55c88 (patch)
tree65cde1eb6958f410c4b4c72e322fd59db463150f /fs
parent31d40d74b402a6fa18a006fb3745f64609f35b77 (diff)
downloadlinux-stericsson-fd72faac95d7e47610e981d7ed7b3c1529e55c88.tar.gz
[PATCH] FUSE: atomic create+open
This patch adds an atomic create+open operation. This does not yet work if the file type changes between lookup and create+open, but solves the permission checking problems for the separte create and open methods. Signed-off-by: Miklos Szeredi <miklos@szeredi.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/fuse/dev.c7
-rw-r--r--fs/fuse/dir.c106
-rw-r--r--fs/fuse/file.c132
-rw-r--r--fs/fuse/fuse_i.h14
4 files changed, 211 insertions, 48 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index a6f90a6c754a..8f873e621f41 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -184,6 +184,13 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
fuse_putback_request() */
for (i = 1; i < FUSE_MAX_OUTSTANDING; i++)
up(&fc->outstanding_sem);
+ } else if (req->in.h.opcode == FUSE_RELEASE && req->inode == NULL) {
+ /* Special case for failed iget in CREATE */
+ u64 nodeid = req->in.h.nodeid;
+ __fuse_get_request(req);
+ fuse_reset_request(req);
+ fuse_send_forget(fc, req, nodeid, 1);
+ putback = 0;
}
if (putback)
fuse_putback_request(fc, req);
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 4bc1afcc476d..83be119ef067 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -13,6 +13,7 @@
#include <linux/gfp.h>
#include <linux/sched.h>
#include <linux/namei.h>
+#include <linux/mount.h>
static inline unsigned long time_to_jiffies(unsigned long sec,
unsigned long nsec)
@@ -134,6 +135,101 @@ static void fuse_invalidate_entry(struct dentry *entry)
entry->d_time = jiffies - 1;
}
+static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
+ struct nameidata *nd)
+{
+ int err;
+ struct inode *inode;
+ struct fuse_conn *fc = get_fuse_conn(dir);
+ struct fuse_req *req;
+ struct fuse_open_in inarg;
+ struct fuse_open_out outopen;
+ struct fuse_entry_out outentry;
+ struct fuse_inode *fi;
+ struct fuse_file *ff;
+ struct file *file;
+ int flags = nd->intent.open.flags - 1;
+
+ err = -ENOSYS;
+ if (fc->no_create)
+ goto out;
+
+ err = -ENAMETOOLONG;
+ if (entry->d_name.len > FUSE_NAME_MAX)
+ goto out;
+
+ err = -EINTR;
+ req = fuse_get_request(fc);
+ if (!req)
+ goto out;
+
+ ff = fuse_file_alloc();
+ if (!ff)
+ goto out_put_request;
+
+ flags &= ~O_NOCTTY;
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.flags = flags;
+ inarg.mode = mode;
+ req->in.h.opcode = FUSE_CREATE;
+ req->in.h.nodeid = get_node_id(dir);
+ req->inode = dir;
+ 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;
+ req->out.numargs = 2;
+ 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;
+ 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))
+ goto out_free_ff;
+
+ inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
+ &outentry.attr);
+ err = -ENOMEM;
+ if (!inode) {
+ flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
+ ff->fh = outopen.fh;
+ fuse_send_release(fc, ff, outentry.nodeid, NULL, flags, 0);
+ goto out_put_request;
+ }
+ fuse_put_request(fc, req);
+ entry->d_time = time_to_jiffies(outentry.entry_valid,
+ outentry.entry_valid_nsec);
+ fi = get_fuse_inode(inode);
+ fi->i_time = time_to_jiffies(outentry.attr_valid,
+ outentry.attr_valid_nsec);
+
+ d_instantiate(entry, inode);
+ file = lookup_instantiate_filp(nd, entry, generic_file_open);
+ if (IS_ERR(file)) {
+ ff->fh = outopen.fh;
+ fuse_send_release(fc, ff, outentry.nodeid, inode, flags, 0);
+ return PTR_ERR(file);
+ }
+ fuse_finish_open(inode, file, ff, &outopen);
+ return 0;
+
+ out_free_ff:
+ fuse_file_free(ff);
+ out_put_request:
+ fuse_put_request(fc, req);
+ out:
+ return err;
+}
+
static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
struct inode *dir, struct dentry *entry,
int mode)
@@ -208,6 +304,12 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
static int fuse_create(struct inode *dir, struct dentry *entry, int mode,
struct nameidata *nd)
{
+ if (nd && (nd->flags & LOOKUP_CREATE)) {
+ 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);
}
@@ -767,7 +869,9 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
struct nameidata *nd)
{
struct inode *inode;
- int err = fuse_lookup_iget(dir, entry, &inode);
+ int err;
+
+ err = fuse_lookup_iget(dir, entry, &inode);
if (err)
return ERR_PTR(err);
if (inode && S_ISDIR(inode->i_mode)) {
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 657ab11c173b..2ca86141d13a 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -14,11 +14,69 @@
static struct file_operations fuse_direct_io_file_operations;
-int fuse_open_common(struct inode *inode, struct file *file, int isdir)
+static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
+ struct fuse_open_out *outargp)
{
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
struct fuse_open_in inarg;
+ struct fuse_req *req;
+ int err;
+
+ req = fuse_get_request(fc);
+ if (!req)
+ return -EINTR;
+
+ memset(&inarg, 0, sizeof(inarg));
+ inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
+ req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
+ req->in.h.nodeid = get_node_id(inode);
+ req->inode = inode;
+ req->in.numargs = 1;
+ req->in.args[0].size = sizeof(inarg);
+ req->in.args[0].value = &inarg;
+ req->out.numargs = 1;
+ req->out.args[0].size = sizeof(*outargp);
+ req->out.args[0].value = outargp;
+ request_send(fc, req);
+ err = req->out.h.error;
+ fuse_put_request(fc, req);
+
+ return err;
+}
+
+struct fuse_file *fuse_file_alloc(void)
+{
+ struct fuse_file *ff;
+ ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
+ if (ff) {
+ ff->release_req = fuse_request_alloc();
+ if (!ff->release_req) {
+ kfree(ff);
+ ff = NULL;
+ }
+ }
+ return ff;
+}
+
+void fuse_file_free(struct fuse_file *ff)
+{
+ fuse_request_free(ff->release_req);
+ kfree(ff);
+}
+
+void fuse_finish_open(struct inode *inode, struct file *file,
+ struct fuse_file *ff, struct fuse_open_out *outarg)
+{
+ if (outarg->open_flags & FOPEN_DIRECT_IO)
+ file->f_op = &fuse_direct_io_file_operations;
+ if (!(outarg->open_flags & FOPEN_KEEP_CACHE))
+ invalidate_inode_pages(inode->i_mapping);
+ ff->fh = outarg->fh;
+ file->private_data = ff;
+}
+
+int fuse_open_common(struct inode *inode, struct file *file, int isdir)
+{
struct fuse_open_out outarg;
struct fuse_file *ff;
int err;
@@ -34,73 +92,53 @@ int fuse_open_common(struct inode *inode, struct file *file, int isdir)
/* If opening the root node, no lookup has been performed on
it, so the attributes must be refreshed */
if (get_node_id(inode) == FUSE_ROOT_ID) {
- int err = fuse_do_getattr(inode);
+ err = fuse_do_getattr(inode);
if (err)
return err;
}
- req = fuse_get_request(fc);
- if (!req)
- return -EINTR;
-
- err = -ENOMEM;
- ff = kmalloc(sizeof(struct fuse_file), GFP_KERNEL);
+ ff = fuse_file_alloc();
if (!ff)
- goto out_put_request;
+ return -ENOMEM;
- ff->release_req = fuse_request_alloc();
- if (!ff->release_req) {
- kfree(ff);
- goto out_put_request;
- }
-
- memset(&inarg, 0, sizeof(inarg));
- inarg.flags = file->f_flags & ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
- req->in.h.opcode = isdir ? FUSE_OPENDIR : FUSE_OPEN;
- req->in.h.nodeid = get_node_id(inode);
- req->inode = inode;
- req->in.numargs = 1;
- req->in.args[0].size = sizeof(inarg);
- req->in.args[0].value = &inarg;
- req->out.numargs = 1;
- req->out.args[0].size = sizeof(outarg);
- req->out.args[0].value = &outarg;
- request_send(fc, req);
- err = req->out.h.error;
- if (err) {
- fuse_request_free(ff->release_req);
- kfree(ff);
- } else {
- if (!isdir && (outarg.open_flags & FOPEN_DIRECT_IO))
- file->f_op = &fuse_direct_io_file_operations;
- if (!(outarg.open_flags & FOPEN_KEEP_CACHE))
- invalidate_inode_pages(inode->i_mapping);
- ff->fh = outarg.fh;
- file->private_data = ff;
+ err = fuse_send_open(inode, file, isdir, &outarg);
+ if (err)
+ fuse_file_free(ff);
+ else {
+ if (isdir)
+ outarg.open_flags &= ~FOPEN_DIRECT_IO;
+ fuse_finish_open(inode, file, ff, &outarg);
}
- out_put_request:
- fuse_put_request(fc, req);
return err;
}
-int fuse_release_common(struct inode *inode, struct file *file, int isdir)
+void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff,
+ u64 nodeid, struct inode *inode, int flags, int isdir)
{
- struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_file *ff = file->private_data;
- struct fuse_req *req = ff->release_req;
+ struct fuse_req * req = ff->release_req;
struct fuse_release_in *inarg = &req->misc.release_in;
inarg->fh = ff->fh;
- inarg->flags = file->f_flags & ~O_EXCL;
+ inarg->flags = flags;
req->in.h.opcode = isdir ? FUSE_RELEASEDIR : FUSE_RELEASE;
- req->in.h.nodeid = get_node_id(inode);
+ req->in.h.nodeid = nodeid;
req->inode = inode;
req->in.numargs = 1;
req->in.args[0].size = sizeof(struct fuse_release_in);
req->in.args[0].value = inarg;
request_send_background(fc, req);
kfree(ff);
+}
+
+int fuse_release_common(struct inode *inode, struct file *file, int isdir)
+{
+ struct fuse_file *ff = file->private_data;
+ if (ff) {
+ struct fuse_conn *fc = get_fuse_conn(inode);
+ u64 nodeid = get_node_id(inode);
+ fuse_send_release(fc, ff, nodeid, inode, file->f_flags, isdir);
+ }
/* Return value is ignored by VFS */
return 0;
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index c4e8c3b47982..0ea5301f86be 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -269,6 +269,9 @@ struct fuse_conn {
/** Is access not implemented by fs? */
unsigned no_access : 1;
+ /** Is create not implemented by fs? */
+ unsigned no_create : 1;
+
/** Backing dev info */
struct backing_dev_info bdi;
};
@@ -340,6 +343,17 @@ size_t fuse_send_read_common(struct fuse_req *req, struct file *file,
*/
int fuse_open_common(struct inode *inode, struct file *file, int isdir);
+struct fuse_file *fuse_file_alloc(void);
+void fuse_file_free(struct fuse_file *ff);
+void fuse_finish_open(struct inode *inode, struct file *file,
+ struct fuse_file *ff, struct fuse_open_out *outarg);
+
+/**
+ * Send a RELEASE request
+ */
+void fuse_send_release(struct fuse_conn *fc, struct fuse_file *ff,
+ u64 nodeid, struct inode *inode, int flags, int isdir);
+
/**
* Send RELEASE or RELEASEDIR request
*/