f2fs: avoid fi->i_gc_rwsem[WRITE] lock in f2fs_gc
The f2fs_gc() called by f2fs_balance_fs() requires to be called outside of fi->i_gc_rwsem[WRITE], since f2fs_gc() can try to grab it in a loop. If it hits the miximum retrials in GC, let's give a chance to release gc_mutex for a short time in order not to go into live lock in the worst case. Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim
Родитель
853137cef4
Коммит
6f8d445506
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@ -2217,14 +2217,14 @@ static void f2fs_write_failed(struct address_space *mapping, loff_t to)
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loff_t i_size = i_size_read(inode);
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if (to > i_size) {
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down_write(&F2FS_I(inode)->i_mmap_sem);
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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truncate_pagecache(inode, i_size);
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f2fs_truncate_blocks(inode, i_size, true);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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}
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}
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@ -1243,6 +1243,7 @@ struct f2fs_sb_info {
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unsigned int gc_mode; /* current GC state */
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/* for skip statistic */
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unsigned long long skipped_atomic_files[2]; /* FG_GC and BG_GC */
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unsigned long long skipped_gc_rwsem; /* FG_GC only */
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/* threshold for gc trials on pinned files */
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u64 gc_pin_file_threshold;
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121
fs/f2fs/file.c
121
fs/f2fs/file.c
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@ -797,8 +797,8 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
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if (attr->ia_valid & ATTR_SIZE) {
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bool to_smaller = (attr->ia_size <= i_size_read(inode));
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down_write(&F2FS_I(inode)->i_mmap_sem);
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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truncate_setsize(inode, attr->ia_size);
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@ -808,8 +808,8 @@ int f2fs_setattr(struct dentry *dentry, struct iattr *attr)
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* do not trim all blocks after i_size if target size is
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* larger than i_size.
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*/
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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if (err)
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return err;
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@ -962,8 +962,8 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
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blk_start = (loff_t)pg_start << PAGE_SHIFT;
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blk_end = (loff_t)pg_end << PAGE_SHIFT;
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down_write(&F2FS_I(inode)->i_mmap_sem);
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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truncate_inode_pages_range(mapping, blk_start,
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blk_end - 1);
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@ -972,8 +972,8 @@ static int punch_hole(struct inode *inode, loff_t offset, loff_t len)
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ret = f2fs_truncate_hole(inode, pg_start, pg_end);
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f2fs_unlock_op(sbi);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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}
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}
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@ -1188,25 +1188,33 @@ roll_back:
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return ret;
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}
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static int f2fs_do_collapse(struct inode *inode, pgoff_t start, pgoff_t end)
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static int f2fs_do_collapse(struct inode *inode, loff_t offset, loff_t len)
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{
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struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
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pgoff_t nrpages = (i_size_read(inode) + PAGE_SIZE - 1) / PAGE_SIZE;
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pgoff_t start = offset >> PAGE_SHIFT;
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pgoff_t end = (offset + len) >> PAGE_SHIFT;
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int ret;
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f2fs_balance_fs(sbi, true);
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/* avoid gc operation during block exchange */
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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f2fs_lock_op(sbi);
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f2fs_drop_extent_tree(inode);
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truncate_pagecache(inode, offset);
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ret = __exchange_data_block(inode, inode, end, start, nrpages - end, true);
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f2fs_unlock_op(sbi);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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return ret;
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}
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static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
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{
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pgoff_t pg_start, pg_end;
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loff_t new_size;
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int ret;
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@ -1221,25 +1229,17 @@ static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
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if (ret)
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return ret;
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pg_start = offset >> PAGE_SHIFT;
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pg_end = (offset + len) >> PAGE_SHIFT;
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/* avoid gc operation during block exchange */
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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/* write out all dirty pages from offset */
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ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
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if (ret)
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goto out_unlock;
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return ret;
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truncate_pagecache(inode, offset);
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ret = f2fs_do_collapse(inode, pg_start, pg_end);
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ret = f2fs_do_collapse(inode, offset, len);
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if (ret)
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goto out_unlock;
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return ret;
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/* write out all moved pages, if possible */
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down_write(&F2FS_I(inode)->i_mmap_sem);
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filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
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truncate_pagecache(inode, offset);
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@ -1247,11 +1247,9 @@ static int f2fs_collapse_range(struct inode *inode, loff_t offset, loff_t len)
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truncate_pagecache(inode, new_size);
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ret = f2fs_truncate_blocks(inode, new_size, true);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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if (!ret)
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f2fs_i_size_write(inode, new_size);
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out_unlock:
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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return ret;
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}
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@ -1317,10 +1315,9 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
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if (ret)
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return ret;
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down_write(&F2FS_I(inode)->i_mmap_sem);
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ret = filemap_write_and_wait_range(mapping, offset, offset + len - 1);
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if (ret)
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goto out_sem;
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return ret;
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pg_start = ((unsigned long long) offset) >> PAGE_SHIFT;
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pg_end = ((unsigned long long) offset + len) >> PAGE_SHIFT;
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@ -1332,7 +1329,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
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ret = fill_zero(inode, pg_start, off_start,
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off_end - off_start);
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if (ret)
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goto out_sem;
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return ret;
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new_size = max_t(loff_t, new_size, offset + len);
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} else {
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@ -1340,7 +1337,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
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ret = fill_zero(inode, pg_start++, off_start,
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PAGE_SIZE - off_start);
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if (ret)
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goto out_sem;
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return ret;
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new_size = max_t(loff_t, new_size,
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(loff_t)pg_start << PAGE_SHIFT);
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@ -1352,6 +1349,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
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pgoff_t end;
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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truncate_pagecache_range(inode,
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(loff_t)index << PAGE_SHIFT,
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@ -1363,6 +1361,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
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ret = f2fs_get_dnode_of_data(&dn, index, ALLOC_NODE);
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if (ret) {
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f2fs_unlock_op(sbi);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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goto out;
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}
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@ -1374,6 +1373,7 @@ static int f2fs_zero_range(struct inode *inode, loff_t offset, loff_t len,
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f2fs_put_dnode(&dn);
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f2fs_unlock_op(sbi);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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f2fs_balance_fs(sbi, dn.node_changed);
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@ -1402,9 +1402,6 @@ out:
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else
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f2fs_i_size_write(inode, new_size);
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}
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out_sem:
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up_write(&F2FS_I(inode)->i_mmap_sem);
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return ret;
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}
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@ -1433,26 +1430,27 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
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f2fs_balance_fs(sbi, true);
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/* avoid gc operation during block exchange */
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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ret = f2fs_truncate_blocks(inode, i_size_read(inode), true);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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if (ret)
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goto out;
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return ret;
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/* write out all dirty pages from offset */
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ret = filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
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if (ret)
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goto out;
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truncate_pagecache(inode, offset);
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return ret;
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pg_start = offset >> PAGE_SHIFT;
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pg_end = (offset + len) >> PAGE_SHIFT;
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delta = pg_end - pg_start;
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idx = (i_size_read(inode) + PAGE_SIZE - 1) / PAGE_SIZE;
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/* avoid gc operation during block exchange */
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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down_write(&F2FS_I(inode)->i_mmap_sem);
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truncate_pagecache(inode, offset);
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while (!ret && idx > pg_start) {
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nr = idx - pg_start;
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if (nr > delta)
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@ -1466,16 +1464,17 @@ static int f2fs_insert_range(struct inode *inode, loff_t offset, loff_t len)
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idx + delta, nr, false);
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f2fs_unlock_op(sbi);
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}
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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/* write out all moved pages, if possible */
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down_write(&F2FS_I(inode)->i_mmap_sem);
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filemap_write_and_wait_range(inode->i_mapping, offset, LLONG_MAX);
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truncate_pagecache(inode, offset);
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up_write(&F2FS_I(inode)->i_mmap_sem);
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if (!ret)
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f2fs_i_size_write(inode, new_size);
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out:
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up_write(&F2FS_I(inode)->i_mmap_sem);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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return ret;
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}
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@ -1722,8 +1721,6 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
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inode_lock(inode);
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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if (f2fs_is_atomic_file(inode)) {
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if (is_inode_flag_set(inode, FI_ATOMIC_REVOKE_REQUEST))
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ret = -EINVAL;
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@ -1734,6 +1731,8 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
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if (ret)
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goto out;
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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if (!get_dirty_pages(inode))
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goto skip_flush;
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@ -1741,18 +1740,20 @@ static int f2fs_ioc_start_atomic_write(struct file *filp)
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"Unexpected flush for atomic writes: ino=%lu, npages=%u",
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inode->i_ino, get_dirty_pages(inode));
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ret = filemap_write_and_wait_range(inode->i_mapping, 0, LLONG_MAX);
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if (ret)
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if (ret) {
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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goto out;
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}
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skip_flush:
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set_inode_flag(inode, FI_ATOMIC_FILE);
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clear_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
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f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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f2fs_update_time(F2FS_I_SB(inode), REQ_TIME);
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F2FS_I(inode)->inmem_task = current;
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stat_inc_atomic_write(inode);
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stat_update_max_atomic_write(inode);
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out:
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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inode_unlock(inode);
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mnt_drop_write_file(filp);
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return ret;
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@ -1770,9 +1771,9 @@ static int f2fs_ioc_commit_atomic_write(struct file *filp)
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if (ret)
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return ret;
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inode_lock(inode);
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f2fs_balance_fs(F2FS_I_SB(inode), true);
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down_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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inode_lock(inode);
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if (f2fs_is_volatile_file(inode)) {
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ret = -EINVAL;
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@ -1798,7 +1799,6 @@ err_out:
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clear_inode_flag(inode, FI_ATOMIC_REVOKE_REQUEST);
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ret = -EINVAL;
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}
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up_write(&F2FS_I(inode)->i_gc_rwsem[WRITE]);
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inode_unlock(inode);
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mnt_drop_write_file(filp);
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return ret;
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@ -2394,15 +2394,10 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
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}
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inode_lock(src);
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down_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
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if (src != dst) {
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ret = -EBUSY;
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if (!inode_trylock(dst))
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goto out;
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if (!down_write_trylock(&F2FS_I(dst)->i_gc_rwsem[WRITE])) {
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inode_unlock(dst);
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goto out;
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}
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}
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ret = -EINVAL;
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@ -2447,6 +2442,14 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
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goto out_unlock;
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f2fs_balance_fs(sbi, true);
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down_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
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if (src != dst) {
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ret = -EBUSY;
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if (!down_write_trylock(&F2FS_I(dst)->i_gc_rwsem[WRITE]))
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goto out_src;
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}
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f2fs_lock_op(sbi);
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ret = __exchange_data_block(src, dst, pos_in >> F2FS_BLKSIZE_BITS,
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pos_out >> F2FS_BLKSIZE_BITS,
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@ -2459,13 +2462,15 @@ static int f2fs_move_file_range(struct file *file_in, loff_t pos_in,
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f2fs_i_size_write(dst, dst_osize);
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}
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f2fs_unlock_op(sbi);
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out_unlock:
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if (src != dst) {
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if (src != dst)
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up_write(&F2FS_I(dst)->i_gc_rwsem[WRITE]);
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inode_unlock(dst);
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}
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out:
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out_src:
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up_write(&F2FS_I(src)->i_gc_rwsem[WRITE]);
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out_unlock:
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if (src != dst)
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inode_unlock(dst);
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out:
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inode_unlock(src);
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return ret;
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}
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26
fs/f2fs/gc.c
26
fs/f2fs/gc.c
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@ -882,6 +882,7 @@ next_step:
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if (!down_write_trylock(
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&F2FS_I(inode)->i_gc_rwsem[WRITE])) {
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iput(inode);
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sbi->skipped_gc_rwsem++;
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continue;
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}
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@ -911,6 +912,7 @@ next_step:
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continue;
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if (!down_write_trylock(
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&fi->i_gc_rwsem[WRITE])) {
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sbi->skipped_gc_rwsem++;
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up_write(&fi->i_gc_rwsem[READ]);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -1048,6 +1050,7 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
|
|||
.iroot = RADIX_TREE_INIT(gc_list.iroot, GFP_NOFS),
|
||||
};
|
||||
unsigned long long last_skipped = sbi->skipped_atomic_files[FG_GC];
|
||||
unsigned long long first_skipped;
|
||||
unsigned int skipped_round = 0, round = 0;
|
||||
|
||||
trace_f2fs_gc_begin(sbi->sb, sync, background,
|
||||
|
|
@ -1060,6 +1063,8 @@ int f2fs_gc(struct f2fs_sb_info *sbi, bool sync,
|
|||
prefree_segments(sbi));
|
||||
|
||||
cpc.reason = __get_cp_reason(sbi);
|
||||
sbi->skipped_gc_rwsem = 0;
|
||||
first_skipped = last_skipped;
|
||||
gc_more:
|
||||
if (unlikely(!(sbi->sb->s_flags & SB_ACTIVE))) {
|
||||
ret = -EINVAL;
|
||||
|
|
@ -1101,7 +1106,8 @@ gc_more:
|
|||
total_freed += seg_freed;
|
||||
|
||||
if (gc_type == FG_GC) {
|
||||
if (sbi->skipped_atomic_files[FG_GC] > last_skipped)
|
||||
if (sbi->skipped_atomic_files[FG_GC] > last_skipped ||
|
||||
sbi->skipped_gc_rwsem)
|
||||
skipped_round++;
|
||||
last_skipped = sbi->skipped_atomic_files[FG_GC];
|
||||
round++;
|
||||
|
|
@ -1110,15 +1116,23 @@ gc_more:
|
|||
if (gc_type == FG_GC)
|
||||
sbi->cur_victim_sec = NULL_SEGNO;
|
||||
|
||||
if (!sync) {
|
||||
if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
|
||||
if (skipped_round > MAX_SKIP_ATOMIC_COUNT &&
|
||||
skipped_round * 2 >= round)
|
||||
f2fs_drop_inmem_pages_all(sbi, true);
|
||||
if (sync)
|
||||
goto stop;
|
||||
|
||||
if (has_not_enough_free_secs(sbi, sec_freed, 0)) {
|
||||
if (skipped_round <= MAX_SKIP_GC_COUNT ||
|
||||
skipped_round * 2 < round) {
|
||||
segno = NULL_SEGNO;
|
||||
goto gc_more;
|
||||
}
|
||||
|
||||
if (first_skipped < last_skipped &&
|
||||
(last_skipped - first_skipped) >
|
||||
sbi->skipped_gc_rwsem) {
|
||||
f2fs_drop_inmem_pages_all(sbi, true);
|
||||
segno = NULL_SEGNO;
|
||||
goto gc_more;
|
||||
}
|
||||
if (gc_type == FG_GC)
|
||||
ret = f2fs_write_checkpoint(sbi, &cpc);
|
||||
}
|
||||
|
|
|
|||
|
|
@ -445,8 +445,10 @@ int f2fs_commit_inmem_pages(struct inode *inode)
|
|||
int err;
|
||||
|
||||
f2fs_balance_fs(sbi, true);
|
||||
f2fs_lock_op(sbi);
|
||||
|
||||
down_write(&fi->i_gc_rwsem[WRITE]);
|
||||
|
||||
f2fs_lock_op(sbi);
|
||||
set_inode_flag(inode, FI_ATOMIC_COMMIT);
|
||||
|
||||
mutex_lock(&fi->inmem_lock);
|
||||
|
|
@ -461,6 +463,8 @@ int f2fs_commit_inmem_pages(struct inode *inode)
|
|||
clear_inode_flag(inode, FI_ATOMIC_COMMIT);
|
||||
|
||||
f2fs_unlock_op(sbi);
|
||||
up_write(&fi->i_gc_rwsem[WRITE]);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -215,7 +215,7 @@ struct segment_allocation {
|
|||
#define IS_DUMMY_WRITTEN_PAGE(page) \
|
||||
(page_private(page) == (unsigned long)DUMMY_WRITTEN_PAGE)
|
||||
|
||||
#define MAX_SKIP_ATOMIC_COUNT 16
|
||||
#define MAX_SKIP_GC_COUNT 16
|
||||
|
||||
struct inmem_pages {
|
||||
struct list_head list;
|
||||
|
|
|
|||
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Ссылка в новой задаче