From: kernel test robot <lkp@intel.com>
To: cros-kernel-buildreports@googlegroups.com
Cc: oe-kbuild-all@lists.linux.dev
Subject: [android-common:android15-6.6 1/1] fs/btrfs/extent_io.c:3203:26: warning: 'last_extent_end' may be used uninitialized
Date: Sun, 3 Aug 2025 20:38:13 +0200 [thread overview]
Message-ID: <202508032052.ohxTqFUt-lkp@intel.com> (raw)
tree: https://android.googlesource.com/kernel/common android15-6.6
head: c1a4113af4ffd59599729ba53e1fdc4b44429bc7
commit: 49d640d2946c35a17b051d54171a032dd95b0f50 [1/1] btrfs: fix race when detecting delalloc ranges during fiemap
config: x86_64-buildonly-randconfig-2001-20250803 (https://download.01.org/0day-ci/archive/20250803/202508032052.ohxTqFUt-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14+deb12u1) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250803/202508032052.ohxTqFUt-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202508032052.ohxTqFUt-lkp@intel.com/
Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings
All warnings (new ones prefixed by >>):
fs/btrfs/extent_io.c: In function 'extent_fiemap':
>> fs/btrfs/extent_io.c:3203:26: warning: 'last_extent_end' may be used uninitialized [-Wmaybe-uninitialized]
3203 | if (cache.cached && cache.offset + cache.len >= last_extent_end) {
| ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/btrfs/extent_io.c:3021:13: note: 'last_extent_end' was declared here
3021 | u64 last_extent_end;
| ^~~~~~~~~~~~~~~
vim +/last_extent_end +3203 fs/btrfs/extent_io.c
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3011
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3012 int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3013 u64 start, u64 len)
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3014 {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3015 const u64 ino = btrfs_ino(inode);
49d640d2946c35 Filipe Manana 2024-02-28 3016 struct extent_state *cached_state = NULL;
b3e744fe6d289b Filipe Manana 2022-11-11 3017 struct extent_state *delalloc_cached_state = NULL;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3018 struct btrfs_path *path;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3019 struct fiemap_cache cache = { 0 };
61dbb952f0a5f5 Filipe Manana 2022-10-11 3020 struct btrfs_backref_share_check_ctx *backref_ctx;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3021 u64 last_extent_end;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3022 u64 prev_extent_end;
ded566b4637f1b Josef Bacik 2024-02-12 3023 u64 range_start;
ded566b4637f1b Josef Bacik 2024-02-12 3024 u64 range_end;
ded566b4637f1b Josef Bacik 2024-02-12 3025 const u64 sectorsize = inode->root->fs_info->sectorsize;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3026 bool stopped = false;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3027 int ret;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3028
49d640d2946c35 Filipe Manana 2024-02-28 3029 cache.entries_size = PAGE_SIZE / sizeof(struct btrfs_fiemap_entry);
49d640d2946c35 Filipe Manana 2024-02-28 3030 cache.entries = kmalloc_array(cache.entries_size,
49d640d2946c35 Filipe Manana 2024-02-28 3031 sizeof(struct btrfs_fiemap_entry),
49d640d2946c35 Filipe Manana 2024-02-28 3032 GFP_KERNEL);
84a7949d409753 Filipe Manana 2022-10-11 3033 backref_ctx = btrfs_alloc_backref_share_check_ctx();
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3034 path = btrfs_alloc_path();
49d640d2946c35 Filipe Manana 2024-02-28 3035 if (!cache.entries || !backref_ctx || !path) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3036 ret = -ENOMEM;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3037 goto out;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3038 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3039
49d640d2946c35 Filipe Manana 2024-02-28 3040 restart:
ded566b4637f1b Josef Bacik 2024-02-12 3041 range_start = round_down(start, sectorsize);
ded566b4637f1b Josef Bacik 2024-02-12 3042 range_end = round_up(start + len, sectorsize);
ded566b4637f1b Josef Bacik 2024-02-12 3043 prev_extent_end = range_start;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3044
49d640d2946c35 Filipe Manana 2024-02-28 3045 lock_extent(&inode->io_tree, range_start, range_end, &cached_state);
49d640d2946c35 Filipe Manana 2024-02-28 3046
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3047 ret = fiemap_find_last_extent_offset(inode, path, &last_extent_end);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3048 if (ret < 0)
49d640d2946c35 Filipe Manana 2024-02-28 3049 goto out_unlock;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3050 btrfs_release_path(path);
fe09e16cc8d444 Liu Bo 2013-09-22 3051
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3052 path->reada = READA_FORWARD;
ded566b4637f1b Josef Bacik 2024-02-12 3053 ret = fiemap_search_slot(inode, path, range_start);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3054 if (ret < 0) {
49d640d2946c35 Filipe Manana 2024-02-28 3055 goto out_unlock;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3056 } else if (ret > 0) {
b8f164e3e67f22 Filipe Manana 2022-09-01 3057 /*
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3058 * No file extent item found, but we may have delalloc between
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3059 * the current offset and i_size. So check for that.
b8f164e3e67f22 Filipe Manana 2022-09-01 3060 */
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3061 ret = 0;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3062 goto check_eof_delalloc;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3063 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3064
ded566b4637f1b Josef Bacik 2024-02-12 3065 while (prev_extent_end < range_end) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3066 struct extent_buffer *leaf = path->nodes[0];
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3067 struct btrfs_file_extent_item *ei;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3068 struct btrfs_key key;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3069 u64 extent_end;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3070 u64 extent_len;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3071 u64 extent_offset = 0;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3072 u64 extent_gen;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3073 u64 disk_bytenr = 0;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3074 u64 flags = 0;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3075 int extent_type;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3076 u8 compression;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3077
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3078 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3079 if (key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY)
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3080 break;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3081
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3082 extent_end = btrfs_file_extent_end(path);
b8f164e3e67f22 Filipe Manana 2022-09-01 3083
fe09e16cc8d444 Liu Bo 2013-09-22 3084 /*
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3085 * The first iteration can leave us at an extent item that ends
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3086 * before our range's start. Move to the next item.
fe09e16cc8d444 Liu Bo 2013-09-22 3087 */
ded566b4637f1b Josef Bacik 2024-02-12 3088 if (extent_end <= range_start)
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3089 goto next_item;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3090
877c14767f106a Filipe Manana 2022-10-11 3091 backref_ctx->curr_leaf_bytenr = leaf->start;
877c14767f106a Filipe Manana 2022-10-11 3092
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3093 /* We have in implicit hole (NO_HOLES feature enabled). */
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3094 if (prev_extent_end < key.offset) {
ded566b4637f1b Josef Bacik 2024-02-12 3095 const u64 hole_end = min(key.offset, range_end) - 1;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3096
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3097 ret = fiemap_process_hole(inode, fieinfo, &cache,
b3e744fe6d289b Filipe Manana 2022-11-11 3098 &delalloc_cached_state,
61dbb952f0a5f5 Filipe Manana 2022-10-11 3099 backref_ctx, 0, 0, 0,
ded566b4637f1b Josef Bacik 2024-02-12 3100 prev_extent_end, hole_end);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3101 if (ret < 0) {
49d640d2946c35 Filipe Manana 2024-02-28 3102 goto out_unlock;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3103 } else if (ret > 0) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3104 /* fiemap_fill_next_extent() told us to stop. */
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3105 stopped = true;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3106 break;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3107 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3108
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3109 /* We've reached the end of the fiemap range, stop. */
ded566b4637f1b Josef Bacik 2024-02-12 3110 if (key.offset >= range_end) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3111 stopped = true;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3112 break;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3113 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3114 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3115
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3116 extent_len = extent_end - key.offset;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3117 ei = btrfs_item_ptr(leaf, path->slots[0],
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3118 struct btrfs_file_extent_item);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3119 compression = btrfs_file_extent_compression(leaf, ei);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3120 extent_type = btrfs_file_extent_type(leaf, ei);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3121 extent_gen = btrfs_file_extent_generation(leaf, ei);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3122
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3123 if (extent_type != BTRFS_FILE_EXTENT_INLINE) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3124 disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, ei);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3125 if (compression == BTRFS_COMPRESS_NONE)
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3126 extent_offset = btrfs_file_extent_offset(leaf, ei);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3127 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3128
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3129 if (compression != BTRFS_COMPRESS_NONE)
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3130 flags |= FIEMAP_EXTENT_ENCODED;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3131
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3132 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3133 flags |= FIEMAP_EXTENT_DATA_INLINE;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3134 flags |= FIEMAP_EXTENT_NOT_ALIGNED;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3135 ret = emit_fiemap_extent(fieinfo, &cache, key.offset, 0,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3136 extent_len, flags);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3137 } else if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3138 ret = fiemap_process_hole(inode, fieinfo, &cache,
b3e744fe6d289b Filipe Manana 2022-11-11 3139 &delalloc_cached_state,
61dbb952f0a5f5 Filipe Manana 2022-10-11 3140 backref_ctx,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3141 disk_bytenr, extent_offset,
84a7949d409753 Filipe Manana 2022-10-11 3142 extent_gen, key.offset,
84a7949d409753 Filipe Manana 2022-10-11 3143 extent_end - 1);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3144 } else if (disk_bytenr == 0) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3145 /* We have an explicit hole. */
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3146 ret = fiemap_process_hole(inode, fieinfo, &cache,
b3e744fe6d289b Filipe Manana 2022-11-11 3147 &delalloc_cached_state,
61dbb952f0a5f5 Filipe Manana 2022-10-11 3148 backref_ctx, 0, 0, 0,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3149 key.offset, extent_end - 1);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3150 } else {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3151 /* We have a regular extent. */
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3152 if (fieinfo->fi_extents_max) {
ceb707da9ad92a Filipe Manana 2022-10-11 3153 ret = btrfs_is_data_extent_shared(inode,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3154 disk_bytenr,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3155 extent_gen,
61dbb952f0a5f5 Filipe Manana 2022-10-11 3156 backref_ctx);
dc046b10c8b7d4 Josef Bacik 2014-09-10 3157 if (ret < 0)
49d640d2946c35 Filipe Manana 2024-02-28 3158 goto out_unlock;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3159 else if (ret > 0)
fe09e16cc8d444 Liu Bo 2013-09-22 3160 flags |= FIEMAP_EXTENT_SHARED;
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3161 }
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3162
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3163 ret = emit_fiemap_extent(fieinfo, &cache, key.offset,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3164 disk_bytenr + extent_offset,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3165 extent_len, flags);
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3166 }
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3167
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3168 if (ret < 0) {
49d640d2946c35 Filipe Manana 2024-02-28 3169 goto out_unlock;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3170 } else if (ret > 0) {
49d640d2946c35 Filipe Manana 2024-02-28 3171 /* emit_fiemap_extent() told us to stop. */
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3172 stopped = true;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3173 break;
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3174 }
09fbc1c8e7b00e Filipe Manana 2022-09-01 3175
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3176 prev_extent_end = extent_end;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3177 next_item:
09fbc1c8e7b00e Filipe Manana 2022-09-01 3178 if (fatal_signal_pending(current)) {
09fbc1c8e7b00e Filipe Manana 2022-09-01 3179 ret = -EINTR;
49d640d2946c35 Filipe Manana 2024-02-28 3180 goto out_unlock;
09fbc1c8e7b00e Filipe Manana 2022-09-01 3181 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3182
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3183 ret = fiemap_next_leaf_item(inode, path);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3184 if (ret < 0) {
49d640d2946c35 Filipe Manana 2024-02-28 3185 goto out_unlock;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3186 } else if (ret > 0) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3187 /* No more file extent items for this inode. */
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3188 break;
26e726afe01c1c Chengyu Song 2015-03-24 3189 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3190 cond_resched();
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3191 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3192
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3193 check_eof_delalloc:
ded566b4637f1b Josef Bacik 2024-02-12 3194 if (!stopped && prev_extent_end < range_end) {
b3e744fe6d289b Filipe Manana 2022-11-11 3195 ret = fiemap_process_hole(inode, fieinfo, &cache,
b3e744fe6d289b Filipe Manana 2022-11-11 3196 &delalloc_cached_state, backref_ctx,
ded566b4637f1b Josef Bacik 2024-02-12 3197 0, 0, 0, prev_extent_end, range_end - 1);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3198 if (ret < 0)
49d640d2946c35 Filipe Manana 2024-02-28 3199 goto out_unlock;
ded566b4637f1b Josef Bacik 2024-02-12 3200 prev_extent_end = range_end;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3201 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3202
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 @3203 if (cache.cached && cache.offset + cache.len >= last_extent_end) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3204 const u64 i_size = i_size_read(&inode->vfs_inode);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3205
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3206 if (prev_extent_end < i_size) {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3207 u64 delalloc_start;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3208 u64 delalloc_end;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3209 bool delalloc;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3210
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3211 delalloc = btrfs_find_delalloc_in_range(inode,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3212 prev_extent_end,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3213 i_size - 1,
b3e744fe6d289b Filipe Manana 2022-11-11 3214 &delalloc_cached_state,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3215 &delalloc_start,
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3216 &delalloc_end);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3217 if (!delalloc)
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3218 cache.flags |= FIEMAP_EXTENT_LAST;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3219 } else {
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3220 cache.flags |= FIEMAP_EXTENT_LAST;
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3221 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3222 }
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3223
49d640d2946c35 Filipe Manana 2024-02-28 3224 out_unlock:
49d640d2946c35 Filipe Manana 2024-02-28 3225 unlock_extent(&inode->io_tree, range_start, range_end, &cached_state);
49d640d2946c35 Filipe Manana 2024-02-28 3226
49d640d2946c35 Filipe Manana 2024-02-28 3227 if (ret == BTRFS_FIEMAP_FLUSH_CACHE) {
49d640d2946c35 Filipe Manana 2024-02-28 3228 btrfs_release_path(path);
49d640d2946c35 Filipe Manana 2024-02-28 3229 ret = flush_fiemap_cache(fieinfo, &cache);
49d640d2946c35 Filipe Manana 2024-02-28 3230 if (ret)
49d640d2946c35 Filipe Manana 2024-02-28 3231 goto out;
49d640d2946c35 Filipe Manana 2024-02-28 3232 len -= cache.next_search_offset - start;
49d640d2946c35 Filipe Manana 2024-02-28 3233 start = cache.next_search_offset;
49d640d2946c35 Filipe Manana 2024-02-28 3234 goto restart;
49d640d2946c35 Filipe Manana 2024-02-28 3235 } else if (ret < 0) {
49d640d2946c35 Filipe Manana 2024-02-28 3236 goto out;
49d640d2946c35 Filipe Manana 2024-02-28 3237 }
49d640d2946c35 Filipe Manana 2024-02-28 3238
49d640d2946c35 Filipe Manana 2024-02-28 3239 /*
49d640d2946c35 Filipe Manana 2024-02-28 3240 * Must free the path before emitting to the fiemap buffer because we
49d640d2946c35 Filipe Manana 2024-02-28 3241 * may have a non-cloned leaf and if the fiemap buffer is memory mapped
49d640d2946c35 Filipe Manana 2024-02-28 3242 * to a file, a write into it (through btrfs_page_mkwrite()) may trigger
49d640d2946c35 Filipe Manana 2024-02-28 3243 * waiting for an ordered extent that in order to complete needs to
49d640d2946c35 Filipe Manana 2024-02-28 3244 * modify that leaf, therefore leading to a deadlock.
49d640d2946c35 Filipe Manana 2024-02-28 3245 */
49d640d2946c35 Filipe Manana 2024-02-28 3246 btrfs_free_path(path);
49d640d2946c35 Filipe Manana 2024-02-28 3247 path = NULL;
49d640d2946c35 Filipe Manana 2024-02-28 3248
49d640d2946c35 Filipe Manana 2024-02-28 3249 ret = flush_fiemap_cache(fieinfo, &cache);
49d640d2946c35 Filipe Manana 2024-02-28 3250 if (ret)
49d640d2946c35 Filipe Manana 2024-02-28 3251 goto out;
49d640d2946c35 Filipe Manana 2024-02-28 3252
5c5aff98f83abc David Sterba 2019-03-20 3253 ret = emit_last_fiemap_cache(fieinfo, &cache);
ac3c0d36a2a2f7 Filipe Manana 2022-09-01 3254 out:
b3e744fe6d289b Filipe Manana 2022-11-11 3255 free_extent_state(delalloc_cached_state);
49d640d2946c35 Filipe Manana 2024-02-28 3256 kfree(cache.entries);
84a7949d409753 Filipe Manana 2022-10-11 3257 btrfs_free_backref_share_ctx(backref_ctx);
e02d48eaaed77f Colin Ian King 2019-07-05 3258 btrfs_free_path(path);
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3259 return ret;
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3260 }
1506fcc8189cdd Yehuda Sadeh 2009-01-21 3261
:::::: The code at line 3203 was first introduced by commit
:::::: ac3c0d36a2a2f7a8f9778faef3f2639f5bf29d44 btrfs: make fiemap more efficient and accurate reporting extent sharedness
:::::: TO: Filipe Manana <fdmanana@suse.com>
:::::: CC: David Sterba <dsterba@suse.com>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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