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Message-ID: <20081107142022.GK25194@skywalker>
Date: Fri, 7 Nov 2008 19:50:22 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: Theodore Tso <tytso@....edu>
Cc: cmm@...ibm.com, sandeen@...hat.com, linux-ext4@...r.kernel.org
Subject: Re: [RFC PATCH -V3 1/9] ext4: sparse fixes
On Thu, Nov 06, 2008 at 05:09:54PM -0500, Theodore Tso wrote:
> On Fri, Nov 07, 2008 at 12:19:26AM +0530, Aneesh Kumar K.V wrote:
> > #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
> > - (EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask))
> > + (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_compat) & mask)
> > #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
> > - (EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask))
> > + (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) & mask)
> > #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
> > - (EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask))
> > + (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) & mask)
>
> This is going to force a byte-swap instruction on every single
> big-endian system out there, which could potentially be costly, or at
> least undeed given that all of the times that these functions are
> called, the result gets used only as a booelan.
>
> Can we shut up sparse by using a explicit cast to an unsigned int?
I did it that way first But found the error path needing conversion.
But i guess it is ok since it happen in the error path printk.
ext4: sparse fixes
From: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
---
fs/ext4/ext4.h | 9 ++++++---
fs/ext4/extents.c | 4 ++--
fs/ext4/file.c | 3 ---
fs/ext4/inode.c | 2 +-
fs/ext4/mballoc.c | 4 +++-
fs/ext4/super.c | 19 +++++++++++--------
6 files changed, 23 insertions(+), 18 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 9415a1a..5fc8def 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -726,11 +726,11 @@ static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
*/
#define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
- (EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask))
+ (__force __u32)(EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask))
#define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
- (EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask))
+ (__force __u32)(EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask))
#define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
- (EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask))
+ (__force __u32)(EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask))
#define EXT4_SET_COMPAT_FEATURE(sb,mask) \
EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
#define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
@@ -1284,6 +1284,9 @@ extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
sector_t block, unsigned int max_blocks,
struct buffer_head *bh, int create,
int extend_disksize, int flag);
+extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ __u64 start, __u64 len);
+
#endif /* __KERNEL__ */
#endif /* _EXT4_H */
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 6b8c687..228261e 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3081,7 +3081,7 @@ long ext4_fallocate(struct inode *inode, int mode, loff_t offset, loff_t len)
/*
* Callback function called for each extent to gather FIEMAP information.
*/
-int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
+static int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
struct ext4_ext_cache *newex, struct ext4_extent *ex,
void *data)
{
@@ -3150,7 +3150,7 @@ int ext4_ext_fiemap_cb(struct inode *inode, struct ext4_ext_path *path,
/* fiemap flags we can handle specified here */
#define EXT4_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
-int ext4_xattr_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo)
+static int ext4_xattr_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo)
{
__u64 physical = 0;
__u64 length;
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 6bd11fb..f731cb5 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -140,9 +140,6 @@ static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
return 0;
}
-extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
- __u64 start, __u64 len);
-
const struct file_operations ext4_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1ef1205..d42f748 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3856,7 +3856,7 @@ static int __ext4_get_inode_loc(struct inode *inode,
ext4_fsblk_t block;
int inodes_per_block, inode_offset;
- iloc->bh = 0;
+ iloc->bh = NULL;
if (!ext4_valid_inum(sb, inode->i_ino))
return -EIO;
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 59151c1..9cc93af 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -1056,6 +1056,8 @@ static void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
int first, int count)
+__releases(bitlock)
+__acquires(bitlock)
{
int block = 0;
int max = 0;
@@ -2242,7 +2244,7 @@ ext4_mb_store_history(struct ext4_allocation_context *ac)
/* Create and initialize ext4_group_info data for the given group. */
-int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
+static int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
struct ext4_group_desc *desc)
{
int i, len;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index d4c84f4..d597c1f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1876,7 +1876,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
int db_count;
int i;
int needs_recovery, has_huge_files;
- __le32 features;
+ int features;
__u64 blocks_count;
int err;
@@ -2005,15 +2005,17 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
features = EXT4_HAS_INCOMPAT_FEATURE(sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
if (features) {
printk(KERN_ERR "EXT4-fs: %s: couldn't mount because of "
- "unsupported optional features (%x).\n",
- sb->s_id, le32_to_cpu(features));
+ "unsupported optional features (%x).\n", sb->s_id,
+ (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_incompat) &
+ ~EXT4_FEATURE_INCOMPAT_SUPP));
goto failed_mount;
}
features = EXT4_HAS_RO_COMPAT_FEATURE(sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
if (!(sb->s_flags & MS_RDONLY) && features) {
printk(KERN_ERR "EXT4-fs: %s: couldn't mount RDWR because of "
- "unsupported optional features (%x).\n",
- sb->s_id, le32_to_cpu(features));
+ "unsupported optional features (%x).\n", sb->s_id,
+ (le32_to_cpu(EXT4_SB(sb)->s_es->s_feature_ro_compat) &
+ ~EXT4_FEATURE_RO_COMPAT_SUPP));
goto failed_mount;
}
has_huge_files = EXT4_HAS_RO_COMPAT_FEATURE(sb,
@@ -3036,13 +3038,14 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data)
ext4_mark_recovery_complete(sb, es);
lock_super(sb);
} else {
- __le32 ret;
+ int ret;
if ((ret = EXT4_HAS_RO_COMPAT_FEATURE(sb,
~EXT4_FEATURE_RO_COMPAT_SUPP))) {
printk(KERN_WARNING "EXT4-fs: %s: couldn't "
"remount RDWR because of unsupported "
- "optional features (%x).\n",
- sb->s_id, le32_to_cpu(ret));
+ "optional features (%x).\n", sb->s_id,
+ (le32_to_cpu(sbi->s_es->s_feature_ro_compat)
+ & ~EXT4_FEATURE_RO_COMPAT_SUPP));
err = -EROFS;
goto restore_opts;
}
--
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