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Subject[PATCH 20/30] ocfs2: Silence false lockdep warnings
Date
From: Jan Kara <jack@suse.cz>

Create separate lockdep lock classes for system file's i_mutexes. They are
used to guard allocations and similar things and thus rank differently
than i_mutex of a regular file or directory.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
---
fs/ocfs2/export.c | 4 ++--
fs/ocfs2/inode.c | 10 +++++++++-
fs/ocfs2/inode.h | 7 ++++---
fs/ocfs2/journal.c | 2 +-
fs/ocfs2/namei.c | 2 +-
fs/ocfs2/super.c | 4 ++--
fs/ocfs2/sysfile.c | 2 +-
7 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/fs/ocfs2/export.c b/fs/ocfs2/export.c
index 1f9e353..67527ce 100644
--- a/fs/ocfs2/export.c
+++ b/fs/ocfs2/export.c
@@ -58,7 +58,7 @@ static struct dentry *ocfs2_get_dentry(struct super_block *sb,
return ERR_PTR(-ESTALE);
}

- inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0);
+ inode = ocfs2_iget(OCFS2_SB(sb), handle->ih_blkno, 0, 0);

if (IS_ERR(inode))
return (void *)inode;
@@ -109,7 +109,7 @@ static struct dentry *ocfs2_get_parent(struct dentry *child)
goto bail_unlock;
}

- inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
+ inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
if (IS_ERR(inode)) {
mlog(ML_ERROR, "Unable to create inode %llu\n",
(unsigned long long)blkno);
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 00cd5b7..5e19c11 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -57,8 +57,11 @@ struct ocfs2_find_inode_args
u64 fi_blkno;
unsigned long fi_ino;
unsigned int fi_flags;
+ unsigned int fi_sysfile_type;
};

+static struct lock_class_key ocfs2_sysfile_lock_key[NUM_SYSTEM_INODES];
+
static int ocfs2_read_locked_inode(struct inode *inode,
struct ocfs2_find_inode_args *args);
static int ocfs2_init_locked_inode(struct inode *inode, void *opaque);
@@ -106,7 +109,8 @@ void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
oi->ip_attr |= OCFS2_DIRSYNC_FL;
}

-struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, int flags)
+struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
+ int sysfile_type)
{
struct inode *inode = NULL;
struct super_block *sb = osb->sb;
@@ -126,6 +130,7 @@ struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, int flags)
args.fi_blkno = blkno;
args.fi_flags = flags;
args.fi_ino = ino_from_blkno(sb, blkno);
+ args.fi_sysfile_type = sysfile_type;

inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor,
ocfs2_init_locked_inode, &args);
@@ -200,6 +205,9 @@ static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)

inode->i_ino = args->fi_ino;
OCFS2_I(inode)->ip_blkno = args->fi_blkno;
+ if (args->fi_sysfile_type != 0)
+ lockdep_set_class(&inode->i_mutex,
+ &ocfs2_sysfile_lock_key[args->fi_sysfile_type]);

mlog_exit(0);
return 0;
diff --git a/fs/ocfs2/inode.h b/fs/ocfs2/inode.h
index a61c044..390a855 100644
--- a/fs/ocfs2/inode.h
+++ b/fs/ocfs2/inode.h
@@ -120,9 +120,10 @@ void ocfs2_delete_inode(struct inode *inode);
void ocfs2_drop_inode(struct inode *inode);

/* Flags for ocfs2_iget() */
-#define OCFS2_FI_FLAG_SYSFILE 0x4
-#define OCFS2_FI_FLAG_ORPHAN_RECOVERY 0x8
-struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, int flags);
+#define OCFS2_FI_FLAG_SYSFILE 0x1
+#define OCFS2_FI_FLAG_ORPHAN_RECOVERY 0x2
+struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 feoff, unsigned flags,
+ int sysfile_type);
int ocfs2_inode_init_private(struct inode *inode);
int ocfs2_inode_revalidate(struct dentry *dentry);
int ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 8b9ce2a..f31c7e8 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -1244,7 +1244,7 @@ static int ocfs2_orphan_filldir(void *priv, const char *name, int name_len,

/* Skip bad inodes so that recovery can continue */
iter = ocfs2_iget(p->osb, ino,
- OCFS2_FI_FLAG_ORPHAN_RECOVERY);
+ OCFS2_FI_FLAG_ORPHAN_RECOVERY, 0);
if (IS_ERR(iter))
return 0;

diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index 74018ca..ae9ad95 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -128,7 +128,7 @@ static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
if (status < 0)
goto bail_add;

- inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0);
+ inode = ocfs2_iget(OCFS2_SB(dir->i_sb), blkno, 0, 0);
if (IS_ERR(inode)) {
ret = ERR_PTR(-EACCES);
goto bail_unlock;
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 4a091f5..01fe40e 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -220,7 +220,7 @@ static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)

mlog_entry_void();

- new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE);
+ new = ocfs2_iget(osb, osb->root_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
if (IS_ERR(new)) {
status = PTR_ERR(new);
mlog_errno(status);
@@ -228,7 +228,7 @@ static int ocfs2_init_global_system_inodes(struct ocfs2_super *osb)
}
osb->root_inode = new;

- new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE);
+ new = ocfs2_iget(osb, osb->system_dir_blkno, OCFS2_FI_FLAG_SYSFILE, 0);
if (IS_ERR(new)) {
status = PTR_ERR(new);
mlog_errno(status);
diff --git a/fs/ocfs2/sysfile.c b/fs/ocfs2/sysfile.c
index fd2e846..ab713eb 100644
--- a/fs/ocfs2/sysfile.c
+++ b/fs/ocfs2/sysfile.c
@@ -112,7 +112,7 @@ static struct inode * _ocfs2_get_system_file_inode(struct ocfs2_super *osb,
goto bail;
}

- inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE);
+ inode = ocfs2_iget(osb, blkno, OCFS2_FI_FLAG_SYSFILE, type);
if (IS_ERR(inode)) {
mlog_errno(PTR_ERR(inode));
inode = NULL;
--
1.5.3.6


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