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-rw-r--r--arch/powerpc/configs/ppc6xx_defconfig1
-rw-r--r--arch/powerpc/configs/ps3_defconfig1
-rw-r--r--arch/s390/configs/default_defconfig1
-rw-r--r--arch/sh/configs/rsk7203_defconfig1
-rw-r--r--arch/xtensa/configs/iss_defconfig1
-rw-r--r--arch/xtensa/configs/s6105_defconfig1
-rw-r--r--fs/file_table.c5
-rw-r--r--fs/open.c8
-rw-r--r--include/linux/fs.h49
-rw-r--r--lib/Kconfig.debug10
10 files changed, 0 insertions, 78 deletions
diff --git a/arch/powerpc/configs/ppc6xx_defconfig b/arch/powerpc/configs/ppc6xx_defconfig
index c2353bf059fd..175a8b99c196 100644
--- a/arch/powerpc/configs/ppc6xx_defconfig
+++ b/arch/powerpc/configs/ppc6xx_defconfig
@@ -1244,7 +1244,6 @@ CONFIG_DEBUG_SPINLOCK_SLEEP=y
CONFIG_DEBUG_HIGHMEM=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_VM=y
-CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
# CONFIG_RCU_CPU_STALL_DETECTOR is not set
diff --git a/arch/powerpc/configs/ps3_defconfig b/arch/powerpc/configs/ps3_defconfig
index 139a8308070c..fdee37fab81c 100644
--- a/arch/powerpc/configs/ps3_defconfig
+++ b/arch/powerpc/configs/ps3_defconfig
@@ -174,7 +174,6 @@ CONFIG_DETECT_HUNG_TASK=y
CONFIG_PROVE_LOCKING=y
CONFIG_DEBUG_LOCKDEP=y
CONFIG_DEBUG_INFO=y
-CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_MEMORY_INIT=y
CONFIG_DEBUG_LIST=y
CONFIG_RCU_CPU_STALL_TIMEOUT=60
diff --git a/arch/s390/configs/default_defconfig b/arch/s390/configs/default_defconfig
index e0af2ee58751..3f538468a86e 100644
--- a/arch/s390/configs/default_defconfig
+++ b/arch/s390/configs/default_defconfig
@@ -550,7 +550,6 @@ CONFIG_LOCK_STAT=y
CONFIG_DEBUG_LOCKDEP=y
CONFIG_DEBUG_ATOMIC_SLEEP=y
CONFIG_DEBUG_LOCKING_API_SELFTESTS=y
-CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
CONFIG_DEBUG_NOTIFIERS=y
diff --git a/arch/sh/configs/rsk7203_defconfig b/arch/sh/configs/rsk7203_defconfig
index 4e5229b0c5bb..47236573db83 100644
--- a/arch/sh/configs/rsk7203_defconfig
+++ b/arch/sh/configs/rsk7203_defconfig
@@ -128,7 +128,6 @@ CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_SPINLOCK_SLEEP=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_VM=y
-CONFIG_DEBUG_WRITECOUNT=y
CONFIG_DEBUG_LIST=y
CONFIG_DEBUG_SG=y
CONFIG_FRAME_POINTER=y
diff --git a/arch/xtensa/configs/iss_defconfig b/arch/xtensa/configs/iss_defconfig
index 4f233204faf9..711f8aa14743 100644
--- a/arch/xtensa/configs/iss_defconfig
+++ b/arch/xtensa/configs/iss_defconfig
@@ -627,7 +627,6 @@ CONFIG_SCHED_DEBUG=y
# CONFIG_DEBUG_KOBJECT is not set
# CONFIG_DEBUG_INFO is not set
# CONFIG_DEBUG_VM is not set
-# CONFIG_DEBUG_WRITECOUNT is not set
# CONFIG_DEBUG_MEMORY_INIT is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_SG is not set
diff --git a/arch/xtensa/configs/s6105_defconfig b/arch/xtensa/configs/s6105_defconfig
index d929f77a0360..78318a76fa16 100644
--- a/arch/xtensa/configs/s6105_defconfig
+++ b/arch/xtensa/configs/s6105_defconfig
@@ -569,7 +569,6 @@ CONFIG_DEBUG_SPINLOCK_SLEEP=y
# CONFIG_DEBUG_INFO is not set
# CONFIG_DEBUG_VM is not set
CONFIG_DEBUG_NOMMU_REGIONS=y
-# CONFIG_DEBUG_WRITECOUNT is not set
# CONFIG_DEBUG_MEMORY_INIT is not set
# CONFIG_DEBUG_LIST is not set
# CONFIG_DEBUG_SG is not set
diff --git a/fs/file_table.c b/fs/file_table.c
index 79ecae62209a..ee20658a0647 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -52,7 +52,6 @@ static void file_free_rcu(struct rcu_head *head)
static inline void file_free(struct file *f)
{
percpu_counter_dec(&nr_files);
- file_check_state(f);
call_rcu(&f->f_u.fu_rcuhead, file_free_rcu);
}
@@ -186,7 +185,6 @@ struct file *alloc_file(struct path *path, fmode_t mode,
* that we can do debugging checks at __fput()
*/
if ((mode & FMODE_WRITE) && !special_file(path->dentry->d_inode->i_mode)) {
- file_take_write(file);
WARN_ON(mnt_clone_write(path->mnt));
}
if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
@@ -213,10 +211,7 @@ static void drop_file_write_access(struct file *file)
return;
put_write_access(inode);
- if (file_check_writeable(file) != 0)
- return;
__mnt_drop_write(mnt);
- file_release_write(file);
}
/* the real guts of fput() - releasing the last reference to file
diff --git a/fs/open.c b/fs/open.c
index 2ed7325f713e..8d0b6adfe7b8 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -683,7 +683,6 @@ static int do_dentry_open(struct file *f,
error = __get_file_write_access(inode, f->f_path.mnt);
if (error)
goto cleanup_file;
- file_take_write(f);
}
f->f_mapping = inode->i_mapping;
@@ -731,14 +730,7 @@ cleanup_all:
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITE) {
if (!special_file(inode->i_mode)) {
- /*
- * We don't consider this a real
- * mnt_want/drop_write() pair
- * because it all happenend right
- * here, so just reset the state.
- */
put_write_access(inode);
- file_reset_write(f);
__mnt_drop_write(f->f_path.mnt);
}
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 23b2a35d712e..e80659ed78fc 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -769,9 +769,6 @@ static inline int ra_has_index(struct file_ra_state *ra, pgoff_t index)
index < ra->start + ra->size);
}
-#define FILE_MNT_WRITE_TAKEN 1
-#define FILE_MNT_WRITE_RELEASED 2
-
struct file {
union {
struct llist_node fu_llist;
@@ -809,9 +806,6 @@ struct file {
struct list_head f_tfile_llink;
#endif /* #ifdef CONFIG_EPOLL */
struct address_space *f_mapping;
-#ifdef CONFIG_DEBUG_WRITECOUNT
- unsigned long f_mnt_write_state;
-#endif
} __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
struct file_handle {
@@ -829,49 +823,6 @@ static inline struct file *get_file(struct file *f)
#define fput_atomic(x) atomic_long_add_unless(&(x)->f_count, -1, 1)
#define file_count(x) atomic_long_read(&(x)->f_count)
-#ifdef CONFIG_DEBUG_WRITECOUNT
-static inline void file_take_write(struct file *f)
-{
- WARN_ON(f->f_mnt_write_state != 0);
- f->f_mnt_write_state = FILE_MNT_WRITE_TAKEN;
-}
-static inline void file_release_write(struct file *f)
-{
- f->f_mnt_write_state |= FILE_MNT_WRITE_RELEASED;
-}
-static inline void file_reset_write(struct file *f)
-{
- f->f_mnt_write_state = 0;
-}
-static inline void file_check_state(struct file *f)
-{
- /*
- * At this point, either both or neither of these bits
- * should be set.
- */
- WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN);
- WARN_ON(f->f_mnt_write_state == FILE_MNT_WRITE_RELEASED);
-}
-static inline int file_check_writeable(struct file *f)
-{
- if (f->f_mnt_write_state == FILE_MNT_WRITE_TAKEN)
- return 0;
- printk(KERN_WARNING "writeable file with no "
- "mnt_want_write()\n");
- WARN_ON(1);
- return -EINVAL;
-}
-#else /* !CONFIG_DEBUG_WRITECOUNT */
-static inline void file_take_write(struct file *filp) {}
-static inline void file_release_write(struct file *filp) {}
-static inline void file_reset_write(struct file *filp) {}
-static inline void file_check_state(struct file *filp) {}
-static inline int file_check_writeable(struct file *filp)
-{
- return 0;
-}
-#endif /* CONFIG_DEBUG_WRITECOUNT */
-
#define MAX_NON_LFS ((1UL<<31) - 1)
/* Page cache limit. The filesystems should put that into their s_maxbytes
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index a48abeac753f..7a0859314bdf 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1030,16 +1030,6 @@ config DEBUG_BUGVERBOSE
of the BUG call as well as the EIP and oops trace. This aids
debugging but costs about 70-100K of memory.
-config DEBUG_WRITECOUNT
- bool "Debug filesystem writers count"
- depends on DEBUG_KERNEL
- help
- Enable this to catch wrong use of the writers count in struct
- vfsmount. This will increase the size of each file struct by
- 32 bits.
-
- If unsure, say N.
-
config DEBUG_LIST
bool "Debug linked list manipulation"
depends on DEBUG_KERNEL
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.