wok diff linux/stuff/aufs3-mmap.patch @ rev 25682
Up libqcow (20240308)
| author | Pascal Bellard <pascal.bellard@slitaz.org> |
|---|---|
| date | Sun Mar 24 18:25:46 2024 +0000 (2 months ago) |
| parents | |
| children |
line diff
1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/linux/stuff/aufs3-mmap.patch Sun Mar 24 18:25:46 2024 +0000 1.3 @@ -0,0 +1,420 @@ 1.4 +aufs3.16 mmap patch 1.5 + 1.6 +diff --git a/fs/buffer.c b/fs/buffer.c 1.7 +index eba6e4f..31f0b2d 100644 1.8 +--- a/fs/buffer.c 1.9 ++++ b/fs/buffer.c 1.10 +@@ -2460,7 +2460,7 @@ int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, 1.11 + * Update file times before taking page lock. We may end up failing the 1.12 + * fault so this update may be superfluous but who really cares... 1.13 + */ 1.14 +- file_update_time(vma->vm_file); 1.15 ++ vma_file_update_time(vma); 1.16 + 1.17 + ret = __block_page_mkwrite(vma, vmf, get_block); 1.18 + sb_end_pagefault(sb); 1.19 +diff --git a/fs/proc/base.c b/fs/proc/base.c 1.20 +index 2d696b0..fb92686 100644 1.21 +--- a/fs/proc/base.c 1.22 ++++ b/fs/proc/base.c 1.23 +@@ -1799,7 +1799,7 @@ static int proc_map_files_get_link(struct dentry *dentry, struct path *path) 1.24 + down_read(&mm->mmap_sem); 1.25 + vma = find_exact_vma(mm, vm_start, vm_end); 1.26 + if (vma && vma->vm_file) { 1.27 +- *path = vma->vm_file->f_path; 1.28 ++ *path = vma_pr_or_file(vma)->f_path; 1.29 + path_get(path); 1.30 + rc = 0; 1.31 + } 1.32 +diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c 1.33 +index d4a3574..1397181 100644 1.34 +--- a/fs/proc/nommu.c 1.35 ++++ b/fs/proc/nommu.c 1.36 +@@ -45,7 +45,10 @@ static int nommu_region_show(struct seq_file *m, struct vm_region *region) 1.37 + file = region->vm_file; 1.38 + 1.39 + if (file) { 1.40 +- struct inode *inode = file_inode(region->vm_file); 1.41 ++ struct inode *inode; 1.42 ++ 1.43 ++ file = vmr_pr_or_file(region); 1.44 ++ inode = file_inode(file); 1.45 + dev = inode->i_sb->s_dev; 1.46 + ino = inode->i_ino; 1.47 + } 1.48 +diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c 1.49 +index cfa63ee..bf4919e 100644 1.50 +--- a/fs/proc/task_mmu.c 1.51 ++++ b/fs/proc/task_mmu.c 1.52 +@@ -265,7 +265,10 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) 1.53 + const char *name = NULL; 1.54 + 1.55 + if (file) { 1.56 +- struct inode *inode = file_inode(vma->vm_file); 1.57 ++ struct inode *inode; 1.58 ++ 1.59 ++ file = vma_pr_or_file(vma); 1.60 ++ inode = file_inode(file); 1.61 + dev = inode->i_sb->s_dev; 1.62 + ino = inode->i_ino; 1.63 + pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; 1.64 +@@ -1390,7 +1393,7 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid) 1.65 + struct proc_maps_private *proc_priv = &numa_priv->proc_maps; 1.66 + struct vm_area_struct *vma = v; 1.67 + struct numa_maps *md = &numa_priv->md; 1.68 +- struct file *file = vma->vm_file; 1.69 ++ struct file *file = vma_pr_or_file(vma); 1.70 + struct task_struct *task = proc_priv->task; 1.71 + struct mm_struct *mm = vma->vm_mm; 1.72 + struct mm_walk walk = {}; 1.73 +diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c 1.74 +index 678455d..ebd34ba 100644 1.75 +--- a/fs/proc/task_nommu.c 1.76 ++++ b/fs/proc/task_nommu.c 1.77 +@@ -141,7 +141,10 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma, 1.78 + file = vma->vm_file; 1.79 + 1.80 + if (file) { 1.81 +- struct inode *inode = file_inode(vma->vm_file); 1.82 ++ struct inode *inode; 1.83 ++ 1.84 ++ file = vma_pr_or_file(vma); 1.85 ++ inode = file_inode(file); 1.86 + dev = inode->i_sb->s_dev; 1.87 + ino = inode->i_ino; 1.88 + pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; 1.89 +diff --git a/include/linux/mm.h b/include/linux/mm.h 1.90 +index e03dd29..b576690 100644 1.91 +--- a/include/linux/mm.h 1.92 ++++ b/include/linux/mm.h 1.93 +@@ -1184,6 +1184,28 @@ static inline int fixup_user_fault(struct task_struct *tsk, 1.94 + } 1.95 + #endif 1.96 + 1.97 ++extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int); 1.98 ++extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[], 1.99 ++ int); 1.100 ++extern void vma_do_get_file(struct vm_area_struct *, const char[], int); 1.101 ++extern void vma_do_fput(struct vm_area_struct *, const char[], int); 1.102 ++ 1.103 ++#define vma_file_update_time(vma) vma_do_file_update_time(vma, __func__, \ 1.104 ++ __LINE__) 1.105 ++#define vma_pr_or_file(vma) vma_do_pr_or_file(vma, __func__, \ 1.106 ++ __LINE__) 1.107 ++#define vma_get_file(vma) vma_do_get_file(vma, __func__, __LINE__) 1.108 ++#define vma_fput(vma) vma_do_fput(vma, __func__, __LINE__) 1.109 ++ 1.110 ++#ifndef CONFIG_MMU 1.111 ++extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int); 1.112 ++extern void vmr_do_fput(struct vm_region *, const char[], int); 1.113 ++ 1.114 ++#define vmr_pr_or_file(region) vmr_do_pr_or_file(region, __func__, \ 1.115 ++ __LINE__) 1.116 ++#define vmr_fput(region) vmr_do_fput(region, __func__, __LINE__) 1.117 ++#endif /* !CONFIG_MMU */ 1.118 ++ 1.119 + extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); 1.120 + extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, 1.121 + void *buf, int len, int write); 1.122 +diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h 1.123 +index 96c5750..a087ecd 100644 1.124 +--- a/include/linux/mm_types.h 1.125 ++++ b/include/linux/mm_types.h 1.126 +@@ -232,6 +232,7 @@ struct vm_region { 1.127 + unsigned long vm_top; /* region allocated to here */ 1.128 + unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ 1.129 + struct file *vm_file; /* the backing file or NULL */ 1.130 ++ struct file *vm_prfile; /* the virtual backing file or NULL */ 1.131 + 1.132 + int vm_usage; /* region usage count (access under nommu_region_sem) */ 1.133 + bool vm_icache_flushed : 1; /* true if the icache has been flushed for 1.134 +@@ -300,6 +301,7 @@ struct vm_area_struct { 1.135 + unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE 1.136 + units, *not* PAGE_CACHE_SIZE */ 1.137 + struct file * vm_file; /* File we map to (can be NULL). */ 1.138 ++ struct file *vm_prfile; /* shadow of vm_file */ 1.139 + void * vm_private_data; /* was vm_pte (shared mem) */ 1.140 + 1.141 + #ifndef CONFIG_MMU 1.142 +diff --git a/kernel/fork.c b/kernel/fork.c 1.143 +index 6a13c46..714302c 100644 1.144 +--- a/kernel/fork.c 1.145 ++++ b/kernel/fork.c 1.146 +@@ -416,7 +416,7 @@ static int dup_mmap(struct mm_struct *mm, struct mm_struct *oldmm) 1.147 + struct inode *inode = file_inode(file); 1.148 + struct address_space *mapping = file->f_mapping; 1.149 + 1.150 +- get_file(file); 1.151 ++ vma_get_file(tmp); 1.152 + if (tmp->vm_flags & VM_DENYWRITE) 1.153 + atomic_dec(&inode->i_writecount); 1.154 + mutex_lock(&mapping->i_mmap_mutex); 1.155 +diff --git a/mm/Makefile b/mm/Makefile 1.156 +index 4064f3e..0003fdf 100644 1.157 +--- a/mm/Makefile 1.158 ++++ b/mm/Makefile 1.159 +@@ -18,7 +18,7 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \ 1.160 + mm_init.o mmu_context.o percpu.o slab_common.o \ 1.161 + compaction.o balloon_compaction.o vmacache.o \ 1.162 + interval_tree.o list_lru.o workingset.o \ 1.163 +- iov_iter.o $(mmu-y) 1.164 ++ iov_iter.o prfile.o $(mmu-y) 1.165 + 1.166 + obj-y += init-mm.o 1.167 + 1.168 +diff --git a/mm/filemap.c b/mm/filemap.c 1.169 +index 900edfa..f4dda0c 100644 1.170 +--- a/mm/filemap.c 1.171 ++++ b/mm/filemap.c 1.172 +@@ -2040,7 +2040,7 @@ int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) 1.173 + int ret = VM_FAULT_LOCKED; 1.174 + 1.175 + sb_start_pagefault(inode->i_sb); 1.176 +- file_update_time(vma->vm_file); 1.177 ++ vma_file_update_time(vma); 1.178 + lock_page(page); 1.179 + if (page->mapping != inode->i_mapping) { 1.180 + unlock_page(page); 1.181 +diff --git a/mm/fremap.c b/mm/fremap.c 1.182 +index 72b8fa3..a00bbf0 100644 1.183 +--- a/mm/fremap.c 1.184 ++++ b/mm/fremap.c 1.185 +@@ -224,16 +224,28 @@ get_write_lock: 1.186 + */ 1.187 + if (mapping_cap_account_dirty(mapping)) { 1.188 + unsigned long addr; 1.189 +- struct file *file = get_file(vma->vm_file); 1.190 ++ struct file *file = vma->vm_file, 1.191 ++ *prfile = vma->vm_prfile; 1.192 ++ 1.193 + /* mmap_region may free vma; grab the info now */ 1.194 + vm_flags = vma->vm_flags; 1.195 + 1.196 ++ vma_get_file(vma); 1.197 + addr = mmap_region(file, start, size, vm_flags, pgoff); 1.198 +- fput(file); 1.199 ++ vma_fput(vma); 1.200 + if (IS_ERR_VALUE(addr)) { 1.201 + err = addr; 1.202 + } else { 1.203 + BUG_ON(addr != start); 1.204 ++ if (prfile) { 1.205 ++ struct vm_area_struct *new_vma; 1.206 ++ 1.207 ++ new_vma = find_vma(mm, addr); 1.208 ++ if (!new_vma->vm_prfile) 1.209 ++ new_vma->vm_prfile = prfile; 1.210 ++ if (new_vma != vma) 1.211 ++ get_file(prfile); 1.212 ++ } 1.213 + err = 0; 1.214 + } 1.215 + goto out_freed; 1.216 +diff --git a/mm/memory.c b/mm/memory.c 1.217 +index 8b44f76..69a72bf 100644 1.218 +--- a/mm/memory.c 1.219 ++++ b/mm/memory.c 1.220 +@@ -2161,7 +2161,7 @@ reuse: 1.221 + set_page_dirty_balance(dirty_page); 1.222 + /* file_update_time outside page_lock */ 1.223 + if (vma->vm_file) 1.224 +- file_update_time(vma->vm_file); 1.225 ++ vma_file_update_time(vma); 1.226 + } 1.227 + put_page(dirty_page); 1.228 + if (page_mkwrite) { 1.229 +diff --git a/mm/mmap.c b/mm/mmap.c 1.230 +index 129b847..869d1d7 100644 1.231 +--- a/mm/mmap.c 1.232 ++++ b/mm/mmap.c 1.233 +@@ -253,7 +253,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma) 1.234 + if (vma->vm_ops && vma->vm_ops->close) 1.235 + vma->vm_ops->close(vma); 1.236 + if (vma->vm_file) 1.237 +- fput(vma->vm_file); 1.238 ++ vma_fput(vma); 1.239 + mpol_put(vma_policy(vma)); 1.240 + kmem_cache_free(vm_area_cachep, vma); 1.241 + return next; 1.242 +@@ -863,7 +863,7 @@ again: remove_next = 1 + (end > next->vm_end); 1.243 + if (remove_next) { 1.244 + if (file) { 1.245 + uprobe_munmap(next, next->vm_start, next->vm_end); 1.246 +- fput(file); 1.247 ++ vma_fput(vma); 1.248 + } 1.249 + if (next->anon_vma) 1.250 + anon_vma_merge(vma, next); 1.251 +@@ -1643,8 +1643,8 @@ out: 1.252 + unmap_and_free_vma: 1.253 + if (vm_flags & VM_DENYWRITE) 1.254 + allow_write_access(file); 1.255 ++ vma_fput(vma); 1.256 + vma->vm_file = NULL; 1.257 +- fput(file); 1.258 + 1.259 + /* Undo any partial mapping done by a device driver. */ 1.260 + unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end); 1.261 +@@ -2434,7 +2434,7 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, 1.262 + goto out_free_mpol; 1.263 + 1.264 + if (new->vm_file) 1.265 +- get_file(new->vm_file); 1.266 ++ vma_get_file(new); 1.267 + 1.268 + if (new->vm_ops && new->vm_ops->open) 1.269 + new->vm_ops->open(new); 1.270 +@@ -2453,7 +2453,7 @@ static int __split_vma(struct mm_struct * mm, struct vm_area_struct * vma, 1.271 + if (new->vm_ops && new->vm_ops->close) 1.272 + new->vm_ops->close(new); 1.273 + if (new->vm_file) 1.274 +- fput(new->vm_file); 1.275 ++ vma_fput(new); 1.276 + unlink_anon_vmas(new); 1.277 + out_free_mpol: 1.278 + mpol_put(vma_policy(new)); 1.279 +@@ -2842,7 +2842,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, 1.280 + if (anon_vma_clone(new_vma, vma)) 1.281 + goto out_free_mempol; 1.282 + if (new_vma->vm_file) 1.283 +- get_file(new_vma->vm_file); 1.284 ++ vma_get_file(new_vma); 1.285 + if (new_vma->vm_ops && new_vma->vm_ops->open) 1.286 + new_vma->vm_ops->open(new_vma); 1.287 + vma_link(mm, new_vma, prev, rb_link, rb_parent); 1.288 +diff --git a/mm/nommu.c b/mm/nommu.c 1.289 +index 4a852f6..b369644 100644 1.290 +--- a/mm/nommu.c 1.291 ++++ b/mm/nommu.c 1.292 +@@ -658,7 +658,7 @@ static void __put_nommu_region(struct vm_region *region) 1.293 + up_write(&nommu_region_sem); 1.294 + 1.295 + if (region->vm_file) 1.296 +- fput(region->vm_file); 1.297 ++ vmr_fput(region); 1.298 + 1.299 + /* IO memory and memory shared directly out of the pagecache 1.300 + * from ramfs/tmpfs mustn't be released here */ 1.301 +@@ -823,7 +823,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) 1.302 + if (vma->vm_ops && vma->vm_ops->close) 1.303 + vma->vm_ops->close(vma); 1.304 + if (vma->vm_file) 1.305 +- fput(vma->vm_file); 1.306 ++ vma_fput(vma); 1.307 + put_nommu_region(vma->vm_region); 1.308 + kmem_cache_free(vm_area_cachep, vma); 1.309 + } 1.310 +@@ -1385,7 +1385,7 @@ unsigned long do_mmap_pgoff(struct file *file, 1.311 + goto error_just_free; 1.312 + } 1.313 + } 1.314 +- fput(region->vm_file); 1.315 ++ vmr_fput(region); 1.316 + kmem_cache_free(vm_region_jar, region); 1.317 + region = pregion; 1.318 + result = start; 1.319 +@@ -1461,10 +1461,10 @@ error_just_free: 1.320 + up_write(&nommu_region_sem); 1.321 + error: 1.322 + if (region->vm_file) 1.323 +- fput(region->vm_file); 1.324 ++ vmr_fput(region); 1.325 + kmem_cache_free(vm_region_jar, region); 1.326 + if (vma->vm_file) 1.327 +- fput(vma->vm_file); 1.328 ++ vma_fput(vma); 1.329 + kmem_cache_free(vm_area_cachep, vma); 1.330 + kleave(" = %d", ret); 1.331 + return ret; 1.332 +diff --git a/mm/prfile.c b/mm/prfile.c 1.333 +new file mode 100644 1.334 +index 0000000..532e518 1.335 +--- /dev/null 1.336 ++++ b/mm/prfile.c 1.337 +@@ -0,0 +1,86 @@ 1.338 ++/* 1.339 ++ * Mainly for aufs which mmap(2) diffrent file and wants to print different path 1.340 ++ * in /proc/PID/maps. 1.341 ++ * Call these functions via macros defined in linux/mm.h. 1.342 ++ * 1.343 ++ * See Documentation/filesystems/aufs/design/06mmap.txt 1.344 ++ * 1.345 ++ * Copyright (c) 2014 Junjro R. Okajima 1.346 ++ * Copyright (c) 2014 Ian Campbell 1.347 ++ */ 1.348 ++ 1.349 ++#include <linux/mm.h> 1.350 ++#include <linux/file.h> 1.351 ++#include <linux/fs.h> 1.352 ++ 1.353 ++/* #define PRFILE_TRACE */ 1.354 ++static inline void prfile_trace(struct file *f, struct file *pr, 1.355 ++ const char func[], int line, const char func2[]) 1.356 ++{ 1.357 ++#ifdef PRFILE_TRACE 1.358 ++ if (pr) 1.359 ++ pr_info("%s:%d: %s, %s\n", func, line, func2, 1.360 ++ f ? (char *)f->f_dentry->d_name.name : "(null)"); 1.361 ++#endif 1.362 ++} 1.363 ++ 1.364 ++void vma_do_file_update_time(struct vm_area_struct *vma, const char func[], 1.365 ++ int line) 1.366 ++{ 1.367 ++ struct file *f = vma->vm_file, *pr = vma->vm_prfile; 1.368 ++ 1.369 ++ prfile_trace(f, pr, func, line, __func__); 1.370 ++ file_update_time(f); 1.371 ++ if (f && pr) 1.372 ++ file_update_time(pr); 1.373 ++} 1.374 ++ 1.375 ++struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[], 1.376 ++ int line) 1.377 ++{ 1.378 ++ struct file *f = vma->vm_file, *pr = vma->vm_prfile; 1.379 ++ 1.380 ++ prfile_trace(f, pr, func, line, __func__); 1.381 ++ return (f && pr) ? pr : f; 1.382 ++} 1.383 ++ 1.384 ++void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line) 1.385 ++{ 1.386 ++ struct file *f = vma->vm_file, *pr = vma->vm_prfile; 1.387 ++ 1.388 ++ prfile_trace(f, pr, func, line, __func__); 1.389 ++ get_file(f); 1.390 ++ if (f && pr) 1.391 ++ get_file(pr); 1.392 ++} 1.393 ++ 1.394 ++void vma_do_fput(struct vm_area_struct *vma, const char func[], int line) 1.395 ++{ 1.396 ++ struct file *f = vma->vm_file, *pr = vma->vm_prfile; 1.397 ++ 1.398 ++ prfile_trace(f, pr, func, line, __func__); 1.399 ++ fput(f); 1.400 ++ if (f && pr) 1.401 ++ fput(pr); 1.402 ++} 1.403 ++ 1.404 ++#ifndef CONFIG_MMU 1.405 ++struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[], 1.406 ++ int line) 1.407 ++{ 1.408 ++ struct file *f = region->vm_file, *pr = region->vm_prfile; 1.409 ++ 1.410 ++ prfile_trace(f, pr, func, line, __func__); 1.411 ++ return (f && pr) ? pr : f; 1.412 ++} 1.413 ++ 1.414 ++void vmr_do_fput(struct vm_region *region, const char func[], int line) 1.415 ++{ 1.416 ++ struct file *f = region->vm_file, *pr = region->vm_prfile; 1.417 ++ 1.418 ++ prfile_trace(f, pr, func, line, __func__); 1.419 ++ fput(f); 1.420 ++ if (f && pr) 1.421 ++ fput(pr); 1.422 ++} 1.423 ++#endif /* !CONFIG_MMU */