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Subject[PATCH 11/32] IGET: Stop CIFS from using iget() and read_inode() [try #2]
Date
Stop the CIFS filesystem from using iget() and read_inode().  Replace
cifs_read_inode() with cifs_iget(), and call that instead of iget().
cifs_iget() then uses iget_locked() directly and returns a proper error code
instead of an inode in the event of an error.

cifs_read_super() now returns any error incurred when getting the root inode
instead of ENOMEM.

Signed-off-by: David Howells <dhowells@redhat.com>
---
fs/cifs/cifsfs.c | 8 ++++----
fs/cifs/cifsfs.h | 1 +
fs/cifs/inode.c | 35 ++++++++++++++++++++++++++---------
3 files changed, 31 insertions(+), 13 deletions(-)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index cabb6a5..1cb13f5 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -126,10 +126,11 @@ cifs_read_super(struct super_block *sb, void *data,
#endif
sb->s_blocksize = CIFS_MAX_MSGSIZE;
sb->s_blocksize_bits = 14; /* default 2**14 = CIFS_MAX_MSGSIZE */
- inode = iget(sb, ROOT_I);
+ inode = cifs_iget(sb, ROOT_I);

- if (!inode) {
- rc = -ENOMEM;
+ if (IS_ERR(inode)) {
+ rc = PTR_ERR(inode);
+ inode = NULL;
goto out_no_root;
}

@@ -481,7 +482,6 @@ static int cifs_remount(struct super_block *sb, int *flags, char *data)
}

static const struct super_operations cifs_super_ops = {
- .read_inode = cifs_read_inode,
.put_super = cifs_put_super,
.statfs = cifs_statfs,
.alloc_inode = cifs_alloc_inode,
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index a20de77..74a3190 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -43,6 +43,7 @@ extern void cifs_read_inode(struct inode *);

/* Functions related to inodes */
extern const struct inode_operations cifs_dir_inode_ops;
+extern struct inode *cifs_iget(struct super_block *, unsigned long);
extern int cifs_create(struct inode *, struct dentry *, int,
struct nameidata *);
extern struct dentry *cifs_lookup(struct inode *, struct dentry *,
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index dd41677..48966b9 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -576,20 +576,37 @@ int cifs_get_inode_info(struct inode **pinode,
}

/* gets root inode */
-void cifs_read_inode(struct inode *inode)
+struct inode *cifs_iget(struct super_block *sb, unsigned long ino)
{
int xid;
struct cifs_sb_info *cifs_sb;
+ struct inode *inode;
+ long ret;

- cifs_sb = CIFS_SB(inode->i_sb);
- xid = GetXid();
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (inode->i_state & I_NEW) {
+ cifs_sb = CIFS_SB(inode->i_sb);
+ xid = GetXid();

- if (cifs_sb->tcon->unix_ext)
- cifs_get_inode_info_unix(&inode, "", inode->i_sb, xid);
- else
- cifs_get_inode_info(&inode, "", NULL, inode->i_sb, xid);
- /* can not call macro FreeXid here since in a void func */
- _FreeXid(xid);
+ if (cifs_sb->tcon->unix_ext)
+ ret = cifs_get_inode_info_unix(&inode, "", inode->i_sb,
+ xid);
+ else
+ ret = cifs_get_inode_info(&inode, "", NULL, inode->i_sb,
+ xid);
+ /* can not call macro FreeXid here since in a void func */
+ _FreeXid(xid);
+ if (ret < 0) {
+ iget_failed(inode);
+ inode = ERR_PTR(ret);
+ } else {
+ unlock_new_inode(inode);
+ }
+ }
+
+ return inode;
}

int cifs_unlink(struct inode *inode, struct dentry *direntry)
-
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