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[PATCH] f_count may wrap around

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make it atomic_long_t; while we are at it, get rid of useless checks in affs,
hfs and hpfs - ->open() always has it equal to 1, ->release() - to 0.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2008-07-26 00:39:17 -04:00
parent 3c333937ee
commit 516e0cc564
11 changed files with 27 additions and 39 deletions
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6
include/linux/fs.h
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@ -795,7 +795,7 @@ struct file {
#define f_dentry f_path.dentry
#define f_vfsmnt f_path.mnt
const struct file_operations *f_op;
atomic_t f_count;
atomic_long_t f_count;
unsigned int f_flags;
mode_t f_mode;
loff_t f_pos;
@ -824,8 +824,8 @@ extern spinlock_t files_lock;
#define file_list_lock() spin_lock(&files_lock);
#define file_list_unlock() spin_unlock(&files_lock);
#define get_file(x) atomic_inc(&(x)->f_count)
#define file_count(x) atomic_read(&(x)->f_count)
#define get_file(x) atomic_long_inc(&(x)->f_count)
#define file_count(x) atomic_long_read(&(x)->f_count)
#ifdef CONFIG_DEBUG_WRITECOUNT
static inline void file_take_write(struct file *f)