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authorAl Viro <viro@zeniv.linux.org.uk>2013-01-28 20:37:21 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2013-02-22 23:31:38 -0500
commit2248b87ec1d9f59001d8c69513b2892ac04a2a3d (patch)
tree1df3c5679e5fa10fdb7cc459f5c7108e7bee3b6c /arch/powerpc
parent4e6b8973282829e0d5898d9721880556957f0f98 (diff)
downloadlinux-linaro-stable-2248b87ec1d9f59001d8c69513b2892ac04a2a3d.tar.gz
spufs_mkdir(): don't d_add() on negative parent
NOTE: this really needs testing - I could've easily fucked up refcounting in there. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/cell/spufs/inode.c64
1 files changed, 21 insertions, 43 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 99db6161e5c9..863184b182f4 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -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;
}