tyler.durden
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simplefs
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Start implementing verbose logging depends on macros. (SIMPLEFS_DEBUG) 

In many cases we don't need such verbose loggin, just add macros to
print loggin only if SIMPLEFS_DEBUG isset.
And it will be installed by default. (in Makefile)
This commit is contained in:
Azat Khuzhin 2013-09-29 18:09:06 +04:00
parent f9aa71628d
commit 2d95ccf1a3
3 changed files with 25 additions and 18 deletions
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1
Makefile
View File

@ -1,5 +1,6 @@
obj-m := simplefs.o
simplefs-objs := simple.o
ccflags-y := -DSIMPLEFS_DEBUG
all: ko mkfs-simplefs

27
simple.c
View File

@ -66,8 +66,7 @@ void simplefs_inode_add(struct super_block *vsb, struct simplefs_inode *inode)
struct simplefs_inode *inode_iterator;
if (mutex_lock_interruptible(&simplefs_inodes_mgmt_lock)) {
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return;
}
@ -76,8 +75,7 @@ void simplefs_inode_add(struct super_block *vsb, struct simplefs_inode *inode)
inode_iterator = (struct simplefs_inode *)bh->b_data;
if (mutex_lock_interruptible(&simplefs_sb_lock)) {
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return;
}
@ -110,8 +108,7 @@ int simplefs_sb_get_a_freeblock(struct super_block *vsb, uint64_t * out)
int ret = 0;
if (mutex_lock_interruptible(&simplefs_sb_lock)) {
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
ret = -EINTR;
goto end;
}
@ -148,8 +145,7 @@ static int simplefs_sb_get_objects_count(struct super_block *vsb,
struct simplefs_super_block *sb = SIMPLEFS_SB(vsb);
if (mutex_lock_interruptible(&simplefs_inodes_mgmt_lock)) {
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return -EINTR;
}
*out = sb->inodes_count;
@ -368,8 +364,7 @@ ssize_t simplefs_write(struct file * filp, const char __user * buf, size_t len,
* a shorter buffer */
if (mutex_lock_interruptible(&simplefs_inodes_mgmt_lock)) {
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return -EINTR;
}
/* Save the modified inode */
@ -378,8 +373,7 @@ ssize_t simplefs_write(struct file * filp, const char __user * buf, size_t len,
sfs_inode->file_size = *ppos;
if (mutex_lock_interruptible(&simplefs_sb_lock)) {
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return -EINTR;
}
@ -452,8 +446,7 @@ static int simplefs_create_fs_object(struct inode *dir, struct dentry *dentry,
int ret;
if (mutex_lock_interruptible(&simplefs_directory_children_update_lock)) {
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return -EINTR;
}
sb = dir->i_sb;
@ -544,8 +537,7 @@ static int simplefs_create_fs_object(struct inode *dir, struct dentry *dentry,
if (mutex_lock_interruptible(&simplefs_inodes_mgmt_lock)) {
mutex_unlock(&simplefs_directory_children_update_lock);
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return -EINTR;
}
@ -554,8 +546,7 @@ static int simplefs_create_fs_object(struct inode *dir, struct dentry *dentry,
if (mutex_lock_interruptible(&simplefs_sb_lock)) {
mutex_unlock(&simplefs_inodes_mgmt_lock);
mutex_unlock(&simplefs_directory_children_update_lock);
printk(KERN_ERR "Failed to acquire mutex lock %s +%d\n",
__FILE__, __LINE__);
sfs_trace("Failed to acquire mutex lock\n");
return -EINTR;
}

15
simple.h
View File

@ -1,8 +1,23 @@
#define SIMPLEFS_MAGIC 0x10032013
#define SIMPLEFS_DEFAULT_BLOCK_SIZE 4096
#define SIMPLEFS_FILENAME_MAXLEN 255
#define SIMPLEFS_START_INO 10
#ifdef SIMPLEFS_DEBUG
#define sfs_trace(fmt, ...) { \
printk(KERN_ERR "[simplefs] %s +%d:" fmt, \
__FILE__, __LINE__, ##__VA_ARGS__); \
}
#define sfs_debug(level, fmt, ...) { \
printk(level "[simplefs]:" fmt, ##__VA_ARGS__); \
}
#else
#define sfs_trace(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
#define sfs_debug(level, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
#endif
/* Hard-coded inode number for the root directory */
const int SIMPLEFS_ROOTDIR_INODE_NUMBER = 1;