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proc: commit to genradix 

The new generic radix trees have a simpler API and implementation, and
no limitations on number of elements, so all flex_array users are being
converted

Link: http://lkml.kernel.org/r/20181217131929.11727-6-kent.overstreet@gmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Reviewed-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Eric Paris <eparis@parisplace.org>
Cc: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Pravin B Shelar <pshelar@ovn.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Stephen Smalley <sds@tycho.nsa.gov>
Cc: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kent Overstreet 2019-03-11 23:31:18 -07:00 committed by Linus Torvalds
parent ba20ba2e37
commit 94f8f3b02e
1 changed files with 15 additions and 28 deletions
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45
fs/proc/base.c
View File

@ -59,6 +59,7 @@
#include <linux/capability.h>
#include <linux/file.h>
#include <linux/fdtable.h>
#include <linux/generic-radix-tree.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/namei.h>
@ -92,7 +93,6 @@
#include <linux/sched/coredump.h>
#include <linux/sched/debug.h>
#include <linux/sched/stat.h>
#include <linux/flex_array.h>
#include <linux/posix-timers.h>
#include <trace/events/oom.h>
#include "internal.h"
@ -2142,11 +2142,12 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
struct task_struct *task;
struct mm_struct *mm;
unsigned long nr_files, pos, i;
struct flex_array *fa = NULL;
struct map_files_info info;
GENRADIX(struct map_files_info) fa;
struct map_files_info *p;
int ret;
genradix_init(&fa);
ret = -ENOENT;
task = get_proc_task(file_inode(file));
if (!task)
@ -2178,35 +2179,22 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
*/
for (vma = mm->mmap, pos = 2; vma; vma = vma->vm_next) {
if (vma->vm_file && ++pos > ctx->pos)
nr_files++;
}
if (nr_files) {
fa = flex_array_alloc(sizeof(info), nr_files,
GFP_KERNEL);
if (!fa || flex_array_prealloc(fa, 0, nr_files,
GFP_KERNEL)) {
ret = -ENOMEM;
if (fa)
flex_array_free(fa);
up_read(&mm->mmap_sem);
mmput(mm);
goto out_put_task;
}
for (i = 0, vma = mm->mmap, pos = 2; vma;
vma = vma->vm_next) {
if (!vma->vm_file)
continue;
if (++pos <= ctx->pos)
continue;
info.start = vma->vm_start;
info.end = vma->vm_end;
info.mode = vma->vm_file->f_mode;
if (flex_array_put(fa, i++, &info, GFP_KERNEL))
BUG();
p = genradix_ptr_alloc(&fa, nr_files++, GFP_KERNEL);
if (!p) {
ret = -ENOMEM;
up_read(&mm->mmap_sem);
mmput(mm);
goto out_put_task;
}
p->start = vma->vm_start;
p->end = vma->vm_end;
p->mode = vma->vm_file->f_mode;
}
up_read(&mm->mmap_sem);
mmput(mm);
@ -2215,7 +2203,7 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
char buf[4 * sizeof(long) + 2]; /* max: %lx-%lx\0 */
unsigned int len;
p = flex_array_get(fa, i);
p = genradix_ptr(&fa, i);
len = snprintf(buf, sizeof(buf), "%lx-%lx", p->start, p->end);
if (!proc_fill_cache(file, ctx,
buf, len,
@ -2225,12 +2213,11 @@ proc_map_files_readdir(struct file *file, struct dir_context *ctx)
break;
ctx->pos++;
}
if (fa)
flex_array_free(fa);
out_put_task:
put_task_struct(task);
out:
genradix_free(&fa);
return ret;
}