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spufs_mkdir(): don't d_add() on negative parent

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NOTE: this really needs testing - I could've easily fucked up
refcounting in there.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-01-28 20:37:21 -05:00
parent 4e6b897328
commit 2248b87ec1
1 changed files with 21 additions and 43 deletions
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64
arch/powerpc/platforms/cell/spufs/inode.c
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@ -199,37 +199,18 @@ static int spufs_fill_dir(struct dentry *dir,
const struct spufs_tree_descr *files, umode_t mode,
struct spu_context *ctx)
{
struct dentry *dentry, *tmp;
int ret;
while (files->name && files->name[0]) {
ret = -ENOMEM;
dentry = d_alloc_name(dir, files->name);
int ret;
struct dentry *dentry = d_alloc_name(dir, files->name);
if (!dentry)
goto out;
return -ENOMEM;
ret = spufs_new_file(dir->d_sb, dentry, files->ops,
files->mode & mode, files->size, ctx);
if (ret)
goto out;
return ret;
files++;
}
return 0;
out:
/*
* remove all children from dir. dir->inode is not set so don't
* just simply use spufs_prune_dir() and panic afterwards :)
* dput() looks like it will do the right thing:
* - dec parent's ref counter
* - remove child from parent's child list
* - free child's inode if possible
* - free child
*/
list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_u.d_child) {
dput(dentry);
}
shrink_dcache_parent(dir);
return ret;
}
static int spufs_dir_close(struct inode *inode, struct file *file)
@ -269,10 +250,9 @@ spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
struct inode *inode;
struct spu_context *ctx;
ret = -ENOSPC;
inode = spufs_new_inode(dir->i_sb, mode | S_IFDIR);
if (!inode)
goto out;
return -ENOSPC;
if (dir->i_mode & S_ISGID) {
inode->i_gid = dir->i_gid;
@ -280,40 +260,38 @@ spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
}
ctx = alloc_spu_context(SPUFS_I(dir)->i_gang); /* XXX gang */
SPUFS_I(inode)->i_ctx = ctx;
if (!ctx)
goto out_iput;
if (!ctx) {
iput(inode);
return -ENOSPC;
}
ctx->flags = flags;
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
mutex_lock(&inode->i_mutex);
dget(dentry);
inc_nlink(dir);
inc_nlink(inode);
d_instantiate(dentry, inode);
if (flags & SPU_CREATE_NOSCHED)
ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
mode, ctx);
else
ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
if (ret)
goto out_free_ctx;
if (spufs_get_sb_info(dir->i_sb)->debug)
if (!ret && spufs_get_sb_info(dir->i_sb)->debug)
ret = spufs_fill_dir(dentry, spufs_dir_debug_contents,
mode, ctx);
if (ret)
goto out_free_ctx;
spufs_rmdir(dir, dentry);
d_instantiate(dentry, inode);
dget(dentry);
inc_nlink(dir);
inc_nlink(dentry->d_inode);
goto out;
mutex_unlock(&inode->i_mutex);
out_free_ctx:
spu_forget(ctx);
put_spu_context(ctx);
out_iput:
iput(inode);
out:
return ret;
}