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authorLatchesar Ionkov <lucho@ionkov.net>2006-03-02 02:54:30 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-02 08:33:07 -0800
commit6a3124a3946c16159c3faf83e62ffdb5d1134b3a (patch)
tree989f1e89ed0971824db973af5347b879e12c67cd /fs/9p/vfs_inode.c
parent77a3313551afd53c90012e5a87f7f2b2195fc67e (diff)
downloadop-kernel-dev-6a3124a3946c16159c3faf83e62ffdb5d1134b3a.zip
op-kernel-dev-6a3124a3946c16159c3faf83e62ffdb5d1134b3a.tar.gz
[PATCH] v9fs: fix atomic create open
In order to assure atomic create+open v9fs stores the open fid produced by v9fs_vfs_create in the dentry, from where v9fs_file_open retrieves it and associates it with the open file. This patch modifies v9fs to use nameidata.intent.open values to do the atomic create+open. Signed-off-by: Latchesar Ionkov <lucho@ionkov.net> Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/9p/vfs_inode.c')
-rw-r--r--fs/9p/vfs_inode.c478
1 files changed, 312 insertions, 166 deletions
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 63e5b03..dce729d 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -125,6 +125,38 @@ static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
return res;
}
+int v9fs_uflags2omode(int uflags)
+{
+ int ret;
+
+ ret = 0;
+ switch (uflags&3) {
+ default:
+ case O_RDONLY:
+ ret = V9FS_OREAD;
+ break;
+
+ case O_WRONLY:
+ ret = V9FS_OWRITE;
+ break;
+
+ case O_RDWR:
+ ret = V9FS_ORDWR;
+ break;
+ }
+
+ if (uflags & O_EXCL)
+ ret |= V9FS_OEXCL;
+
+ if (uflags & O_TRUNC)
+ ret |= V9FS_OTRUNC;
+
+ if (uflags & O_APPEND)
+ ret |= V9FS_OAPPEND;
+
+ return ret;
+}
+
/**
* v9fs_blank_wstat - helper function to setup a 9P stat structure
* @v9ses: 9P session info (for determining extended mode)
@@ -163,7 +195,7 @@ v9fs_blank_wstat(struct v9fs_wstat *wstat)
struct inode *v9fs_get_inode(struct super_block *sb, int mode)
{
- struct inode *inode = NULL;
+ struct inode *inode;
struct v9fs_session_info *v9ses = sb->s_fs_info;
dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
@@ -222,171 +254,135 @@ struct inode *v9fs_get_inode(struct super_block *sb, int mode)
return inode;
}
-/**
- * v9fs_create - helper function to create files and directories
- * @dir: directory inode file is being created in
- * @file_dentry: dentry file is being created in
- * @perm: permissions file is being created with
- * @open_mode: resulting open mode for file
- *
- */
-
static int
-v9fs_create(struct inode *dir,
- struct dentry *file_dentry,
- unsigned int perm, unsigned int open_mode)
+v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name,
+ u32 perm, u8 mode, u32 *fidp, struct v9fs_qid *qid, u32 *iounit)
{
- struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
- struct super_block *sb = dir->i_sb;
- struct v9fs_fid *dirfid =
- v9fs_fid_lookup(file_dentry->d_parent);
- struct v9fs_fid *fid = NULL;
- struct inode *file_inode = NULL;
- struct v9fs_fcall *fcall = NULL;
- struct v9fs_qid qid;
- int dirfidnum = -1;
- long newfid = -1;
- int result = 0;
- unsigned int iounit = 0;
- int wfidno = -1;
+ u32 fid;
int err;
+ struct v9fs_fcall *fcall;
- perm = unixmode2p9mode(v9ses, perm);
-
- dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
- file_dentry, perm, open_mode);
-
- if (!dirfid)
- return -EBADF;
-
- dirfidnum = dirfid->fid;
- if (dirfidnum < 0) {
- dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
- dir->i_ino);
- return -EBADF;
- }
-
- if (file_dentry->d_inode) {
- dprintk(DEBUG_ERROR,
- "Odd. There is an inode for dir %lu, name :%s:\n",
- dir->i_ino, file_dentry->d_name.name);
- return -EEXIST;
- }
-
- newfid = v9fs_get_idpool(&v9ses->fidpool);
- if (newfid < 0) {
+ fid = v9fs_get_idpool(&v9ses->fidpool);
+ if (fid < 0) {
eprintk(KERN_WARNING, "no free fids available\n");
- return -ENOSPC;
+ err = -ENOSPC;
+ goto error;
}
- result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
- if (result < 0) {
+ err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall);
+ if (err < 0) {
PRINT_FCALL_ERROR("clone error", fcall);
- v9fs_put_idpool(newfid, &v9ses->fidpool);
- newfid = -1;
- goto CleanUpFid;
+ goto error;
}
-
kfree(fcall);
- fcall = NULL;
- result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
- perm, open_mode, &fcall);
- if (result < 0) {
+ err = v9fs_t_create(v9ses, fid, name, perm, mode, &fcall);
+ if (err < 0) {
PRINT_FCALL_ERROR("create fails", fcall);
- goto CleanUpFid;
+ goto error;
}
- iounit = fcall->params.rcreate.iounit;
- qid = fcall->params.rcreate.qid;
+ if (iounit)
+ *iounit = fcall->params.rcreate.iounit;
+
+ if (qid)
+ *qid = fcall->params.rcreate.qid;
+
+ if (fidp)
+ *fidp = fid;
+
kfree(fcall);
- fcall = NULL;
+ return 0;
- if (!(perm&V9FS_DMDIR)) {
- fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
- dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
- if (!fid) {
- result = -ENOMEM;
- goto CleanUpFid;
- }
+error:
+ if (fid >= 0)
+ v9fs_put_idpool(fid, &v9ses->fidpool);
- fid->qid = qid;
- fid->iounit = iounit;
- } else {
- err = v9fs_t_clunk(v9ses, newfid);
- newfid = -1;
- if (err < 0)
- dprintk(DEBUG_ERROR, "clunk for mkdir failed: %d\n", err);
- }
+ kfree(fcall);
+ return err;
+}
+
+static struct v9fs_fid*
+v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
+{
+ int err;
+ u32 nfid;
+ struct v9fs_fid *ret;
+ struct v9fs_fcall *fcall;
- /* walk to the newly created file and put the fid in the dentry */
- wfidno = v9fs_get_idpool(&v9ses->fidpool);
- if (wfidno < 0) {
+ nfid = v9fs_get_idpool(&v9ses->fidpool);
+ if (nfid < 0) {
eprintk(KERN_WARNING, "no free fids available\n");
- return -ENOSPC;
+ err = -ENOSPC;
+ goto error;
}
- result = v9fs_t_walk(v9ses, dirfidnum, wfidno,
- (char *) file_dentry->d_name.name, &fcall);
- if (result < 0) {
- PRINT_FCALL_ERROR("clone error", fcall);
- v9fs_put_idpool(wfidno, &v9ses->fidpool);
- wfidno = -1;
- goto CleanUpFid;
+ err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
+ &fcall);
+
+ if (err < 0) {
+ PRINT_FCALL_ERROR("walk error", fcall);
+ v9fs_put_idpool(nfid, &v9ses->fidpool);
+ goto error;
}
+
kfree(fcall);
fcall = NULL;
+ ret = v9fs_fid_create(v9ses, nfid);
+ if (!ret) {
+ err = -ENOMEM;
+ goto clunk_fid;
+ }
- if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) {
- v9fs_put_idpool(wfidno, &v9ses->fidpool);
-
- goto CleanUpFid;
+ err = v9fs_fid_insert(ret, dentry);
+ if (err < 0) {
+ v9fs_fid_destroy(ret);
+ goto clunk_fid;
}
- if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
- (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
- (perm & V9FS_DMDEVICE))
- return 0;
+ return ret;
- result = v9fs_t_stat(v9ses, wfidno, &fcall);
- if (result < 0) {
- PRINT_FCALL_ERROR("stat error", fcall);
- goto CleanUpFid;
- }
+clunk_fid:
+ v9fs_t_clunk(v9ses, nfid);
+
+error:
+ kfree(fcall);
+ return ERR_PTR(err);
+}
+struct inode *
+v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid,
+ struct super_block *sb)
+{
+ int err, umode;
+ struct inode *ret;
+ struct v9fs_fcall *fcall;
- file_inode = v9fs_get_inode(sb,
- p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode));
+ ret = NULL;
+ err = v9fs_t_stat(v9ses, fid, &fcall);
+ if (err) {
+ PRINT_FCALL_ERROR("stat error", fcall);
+ goto error;
+ }
- if ((!file_inode) || IS_ERR(file_inode)) {
- dprintk(DEBUG_ERROR, "create inode failed\n");
- result = -EBADF;
- goto CleanUpFid;
+ umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode);
+ ret = v9fs_get_inode(sb, umode);
+ if (IS_ERR(ret)) {
+ err = PTR_ERR(ret);
+ ret = NULL;
+ goto error;
}
- v9fs_stat2inode(&fcall->params.rstat.stat, file_inode, sb);
+ v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb);
kfree(fcall);
- fcall = NULL;
- file_dentry->d_op = &v9fs_dentry_operations;
- d_instantiate(file_dentry, file_inode);
-
- return 0;
+ return ret;
- CleanUpFid:
+error:
kfree(fcall);
- fcall = NULL;
+ if (ret)
+ iput(ret);
- if (newfid >= 0) {
- err = v9fs_t_clunk(v9ses, newfid);
- if (err < 0)
- dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
- }
- if (wfidno >= 0) {
- err = v9fs_t_clunk(v9ses, wfidno);
- if (err < 0)
- dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
- }
- return result;
+ return ERR_PTR(err);
}
/**
@@ -440,20 +436,97 @@ static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
return result;
}
+static int
+v9fs_open_created(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
/**
* v9fs_vfs_create - VFS hook to create files
* @inode: directory inode that is being deleted
* @dentry: dentry that is being deleted
- * @perm: create permissions
+ * @mode: create permissions
* @nd: path information
*
*/
static int
-v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
+v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
- return v9fs_create(inode, dentry, perm, O_RDWR);
+ int err;
+ u32 fid, perm, iounit;
+ int flags;
+ struct v9fs_session_info *v9ses;
+ struct v9fs_fid *dfid, *vfid, *ffid;
+ struct inode *inode;
+ struct v9fs_qid qid;
+ struct file *filp;
+
+ inode = NULL;
+ vfid = NULL;
+ v9ses = v9fs_inode2v9ses(dir);
+ dfid = v9fs_fid_lookup(dentry->d_parent);
+ perm = unixmode2p9mode(v9ses, mode);
+
+ if (nd && nd->flags & LOOKUP_OPEN)
+ flags = nd->intent.open.flags - 1;
+ else
+ flags = O_RDWR;
+
+ err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
+ perm, v9fs_uflags2omode(flags), &fid, &qid, &iounit);
+
+ if (err)
+ goto error;
+
+ vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
+ if (IS_ERR(vfid)) {
+ err = PTR_ERR(vfid);
+ vfid = NULL;
+ goto error;
+ }
+
+ inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ inode = NULL;
+ goto error;
+ }
+
+ dentry->d_op = &v9fs_dentry_operations;
+ d_instantiate(dentry, inode);
+
+ if (nd && nd->flags & LOOKUP_OPEN) {
+ ffid = v9fs_fid_create(v9ses, fid);
+ if (!ffid)
+ return -ENOMEM;
+
+ filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created);
+ if (IS_ERR(filp)) {
+ v9fs_fid_destroy(ffid);
+ return PTR_ERR(filp);
+ }
+
+ ffid->rdir_pos = 0;
+ ffid->rdir_fcall = NULL;
+ ffid->fidopen = 1;
+ ffid->iounit = iounit;
+ ffid->filp = filp;
+ filp->private_data = ffid;
+ }
+
+ return 0;
+
+error:
+ if (vfid)
+ v9fs_fid_destroy(vfid);
+
+ if (inode)
+ iput(inode);
+
+ return err;
}
/**
@@ -464,9 +537,57 @@ v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
*
*/
-static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
+static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
- return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
+ int err;
+ u32 fid, perm;
+ struct v9fs_session_info *v9ses;
+ struct v9fs_fid *dfid, *vfid;
+ struct inode *inode;
+
+ inode = NULL;
+ vfid = NULL;
+ v9ses = v9fs_inode2v9ses(dir);
+ dfid = v9fs_fid_lookup(dentry->d_parent);
+ perm = unixmode2p9mode(v9ses, mode | S_IFDIR);
+
+ err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
+ perm, V9FS_OREAD, &fid, NULL, NULL);
+
+ if (err) {
+ dprintk(DEBUG_ERROR, "create error %d\n", err);
+ goto error;
+ }
+
+ err = v9fs_t_clunk(v9ses, fid);
+ if (err) {
+ dprintk(DEBUG_ERROR, "clunk error %d\n", err);
+ goto error;
+ }
+
+ vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
+ if (IS_ERR(vfid)) {
+ err = PTR_ERR(vfid);
+ vfid = NULL;
+ goto error;
+ }
+
+ inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ inode = NULL;
+ goto error;
+ }
+
+ dentry->d_op = &v9fs_dentry_operations;
+ d_instantiate(dentry, inode);
+ return 0;
+
+error:
+ if (vfid)
+ v9fs_fid_destroy(vfid);
+
+ return err;
}
/**
@@ -516,9 +637,8 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
return ERR_PTR(-ENOSPC);
}
- result =
- v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
- NULL);
+ result = v9fs_t_walk(v9ses, dirfidnum, newfid,
+ (char *)dentry->d_name.name, NULL);
if (result < 0) {
v9fs_put_idpool(newfid, &v9ses->fidpool);
if (result == -ENOENT) {
@@ -551,13 +671,17 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid);
- fid = v9fs_fid_create(dentry, v9ses, newfid, 0);
+ fid = v9fs_fid_create(v9ses, newfid);
if (fid == NULL) {
dprintk(DEBUG_ERROR, "couldn't insert\n");
result = -ENOMEM;
goto FreeFcall;
}
+ result = v9fs_fid_insert(fid, dentry);
+ if (result < 0)
+ goto FreeFcall;
+
fid->qid = fcall->params.rstat.stat.qid;
dentry->d_op = &v9fs_dentry_operations;
@@ -886,8 +1010,8 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
}
/* copy extension buffer into buffer */
- if (fcall->params.rstat.stat.extension.len+1 < buflen)
- buflen = fcall->params.rstat.stat.extension.len + 1;
+ if (fcall->params.rstat.stat.extension.len < buflen)
+ buflen = fcall->params.rstat.stat.extension.len;
memcpy(buffer, fcall->params.rstat.stat.extension.str, buflen - 1);
buffer[buflen-1] = 0;
@@ -951,7 +1075,7 @@ static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
if (!link)
link = ERR_PTR(-ENOMEM);
else {
- len = v9fs_readlink(dentry, link, PATH_MAX);
+ len = v9fs_readlink(dentry, link, strlen(link));
if (len < 0) {
__putname(link);
@@ -983,53 +1107,75 @@ static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void
static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry,
int mode, const char *extension)
{
- int err, retval;
+ int err;
+ u32 fid, perm;
struct v9fs_session_info *v9ses;
+ struct v9fs_fid *dfid, *vfid;
+ struct inode *inode;
struct v9fs_fcall *fcall;
- struct v9fs_fid *fid;
struct v9fs_wstat wstat;
- v9ses = v9fs_inode2v9ses(dir);
- retval = -EPERM;
fcall = NULL;
+ inode = NULL;
+ vfid = NULL;
+ v9ses = v9fs_inode2v9ses(dir);
+ dfid = v9fs_fid_lookup(dentry->d_parent);
+ perm = unixmode2p9mode(v9ses, mode);
if (!v9ses->extended) {
dprintk(DEBUG_ERROR, "not extended\n");
- goto free_mem;
+ return -EPERM;
}
- /* issue a create */
- retval = v9fs_create(dir, dentry, mode, 0);
- if (retval != 0)
- goto free_mem;
+ err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name,
+ perm, V9FS_OREAD, &fid, NULL, NULL);
- fid = v9fs_fid_get_created(dentry);
- if (!fid) {
- dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
- goto free_mem;
+ if (err)
+ goto error;
+
+ err = v9fs_t_clunk(v9ses, fid);
+ if (err)
+ goto error;
+
+ vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry);
+ if (IS_ERR(vfid)) {
+ err = PTR_ERR(vfid);
+ vfid = NULL;
+ goto error;
+ }
+
+ inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ inode = NULL;
+ goto error;
}
/* issue a Twstat */
v9fs_blank_wstat(&wstat);
wstat.muid = v9ses->name;
wstat.extension = (char *) extension;
- retval = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall);
- if (retval < 0) {
- PRINT_FCALL_ERROR("wstat error", fcall);
- goto free_mem;
- }
-
- err = v9fs_t_clunk(v9ses, fid->fid);
+ err = v9fs_t_wstat(v9ses, vfid->fid, &wstat, &fcall);
if (err < 0) {
- dprintk(DEBUG_ERROR, "clunk failed: %d\n", err);
- goto free_mem;
+ PRINT_FCALL_ERROR("wstat error", fcall);
+ goto error;
}
- d_drop(dentry); /* FID - will this also clunk? */
+ kfree(fcall);
+ dentry->d_op = &v9fs_dentry_operations;
+ d_instantiate(dentry, inode);
+ return 0;
-free_mem:
+error:
kfree(fcall);
- return retval;
+ if (vfid)
+ v9fs_fid_destroy(vfid);
+
+ if (inode)
+ iput(inode);
+
+ return err;
+
}
/**
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