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-rw-r--r--fs/file.c60
1 files changed, 23 insertions, 37 deletions
diff --git a/fs/file.c b/fs/file.c
index 34bb7f71d99..0be344755c0 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -39,28 +39,27 @@ int sysctl_nr_open_max = 1024 * 1024; /* raised later */
*/
static DEFINE_PER_CPU(struct fdtable_defer, fdtable_defer_list);
-static inline void * alloc_fdmem(unsigned int size)
+static inline void *alloc_fdmem(unsigned int size)
{
- if (size <= PAGE_SIZE)
- return kmalloc(size, GFP_KERNEL);
- else
- return vmalloc(size);
+ void *data;
+
+ data = kmalloc(size, GFP_KERNEL|__GFP_NOWARN);
+ if (data != NULL)
+ return data;
+
+ return vmalloc(size);
}
-static inline void free_fdarr(struct fdtable *fdt)
+static void free_fdmem(void *ptr)
{
- if (fdt->max_fds <= (PAGE_SIZE / sizeof(struct file *)))
- kfree(fdt->fd);
- else
- vfree(fdt->fd);
+ is_vmalloc_addr(ptr) ? vfree(ptr) : kfree(ptr);
}
-static inline void free_fdset(struct fdtable *fdt)
+static void __free_fdtable(struct fdtable *fdt)
{
- if (fdt->max_fds <= (PAGE_SIZE * BITS_PER_BYTE / 2))
- kfree(fdt->open_fds);
- else
- vfree(fdt->open_fds);
+ free_fdmem(fdt->fd);
+ free_fdmem(fdt->open_fds);
+ kfree(fdt);
}
static void free_fdtable_work(struct work_struct *work)
@@ -75,9 +74,8 @@ static void free_fdtable_work(struct work_struct *work)
spin_unlock_bh(&f->lock);
while(fdt) {
struct fdtable *next = fdt->next;
- vfree(fdt->fd);
- free_fdset(fdt);
- kfree(fdt);
+
+ __free_fdtable(fdt);
fdt = next;
}
}
@@ -98,7 +96,7 @@ void free_fdtable_rcu(struct rcu_head *rcu)
container_of(fdt, struct files_struct, fdtab));
return;
}
- if (fdt->max_fds <= (PAGE_SIZE / sizeof(struct file *))) {
+ if (!is_vmalloc_addr(fdt->fd) && !is_vmalloc_addr(fdt->open_fds)) {
kfree(fdt->fd);
kfree(fdt->open_fds);
kfree(fdt);
@@ -178,13 +176,12 @@ static struct fdtable * alloc_fdtable(unsigned int nr)
fdt->open_fds = (fd_set *)data;
data += nr / BITS_PER_BYTE;
fdt->close_on_exec = (fd_set *)data;
- INIT_RCU_HEAD(&fdt->rcu);
fdt->next = NULL;
return fdt;
out_arr:
- free_fdarr(fdt);
+ free_fdmem(fdt->fd);
out_fdt:
kfree(fdt);
out:
@@ -214,9 +211,7 @@ static int expand_fdtable(struct files_struct *files, int nr)
* caller and alloc_fdtable(). Cheaper to catch it here...
*/
if (unlikely(new_fdt->max_fds <= nr)) {
- free_fdarr(new_fdt);
- free_fdset(new_fdt);
- kfree(new_fdt);
+ __free_fdtable(new_fdt);
return -EMFILE;
}
/*
@@ -232,9 +227,7 @@ static int expand_fdtable(struct files_struct *files, int nr)
free_fdtable(cur_fdt);
} else {
/* Somebody else expanded, so undo our attempt */
- free_fdarr(new_fdt);
- free_fdset(new_fdt);
- kfree(new_fdt);
+ __free_fdtable(new_fdt);
}
return 1;
}
@@ -312,7 +305,6 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
new_fdt->close_on_exec = (fd_set *)&newf->close_on_exec_init;
new_fdt->open_fds = (fd_set *)&newf->open_fds_init;
new_fdt->fd = &newf->fd_array[0];
- INIT_RCU_HEAD(&new_fdt->rcu);
new_fdt->next = NULL;
spin_lock(&oldf->file_lock);
@@ -325,11 +317,8 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
while (unlikely(open_files > new_fdt->max_fds)) {
spin_unlock(&oldf->file_lock);
- if (new_fdt != &newf->fdtab) {
- free_fdarr(new_fdt);
- free_fdset(new_fdt);
- kfree(new_fdt);
- }
+ if (new_fdt != &newf->fdtab)
+ __free_fdtable(new_fdt);
new_fdt = alloc_fdtable(open_files - 1);
if (!new_fdt) {
@@ -339,9 +328,7 @@ struct files_struct *dup_fd(struct files_struct *oldf, int *errorp)
/* beyond sysctl_nr_open; nothing to do */
if (unlikely(new_fdt->max_fds < open_files)) {
- free_fdarr(new_fdt);
- free_fdset(new_fdt);
- kfree(new_fdt);
+ __free_fdtable(new_fdt);
*errorp = -EMFILE;
goto out_release;
}
@@ -430,7 +417,6 @@ struct files_struct init_files = {
.fd = &init_files.fd_array[0],
.close_on_exec = (fd_set *)&init_files.close_on_exec_init,
.open_fds = (fd_set *)&init_files.open_fds_init,
- .rcu = RCU_HEAD_INIT,
},
.file_lock = __SPIN_LOCK_UNLOCKED(init_task.file_lock),
};