From mboxrd@z Thu Jan 1 00:00:00 1970 From: James Simmons Date: Sun, 21 Jul 2019 21:23:45 -0400 Subject: [lustre-devel] [PATCH 16/22] ext4: add warning for directory htree growth In-Reply-To: <1563758631-29550-1-git-send-email-jsimmons@infradead.org> References: <1563758631-29550-1-git-send-email-jsimmons@infradead.org> Message-ID: <1563758631-29550-17-git-send-email-jsimmons@infradead.org> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lustre-devel@lists.lustre.org Signed-off-by: James Simmons --- fs/ext4/ext4.h | 1 + fs/ext4/namei.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-- fs/ext4/super.c | 2 ++ fs/ext4/sysfs.c | 2 ++ 4 files changed, 72 insertions(+), 2 deletions(-) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index bf74c7c..5f73e19 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -1472,6 +1472,7 @@ struct ext4_sb_info { unsigned int s_mb_group_prealloc; unsigned long *s_mb_prealloc_table; unsigned int s_max_dir_size_kb; + unsigned long s_warning_dir_size; /* where last allocation was done - for stream allocation */ unsigned long s_mb_last_group; unsigned long s_mb_last_start; diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 1b6d22a..9b30cc6 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -757,12 +757,20 @@ struct ext4_dir_lock_data { #define ext4_htree_lock_data(l) ((struct ext4_dir_lock_data *)(l)->lk_private) #define ext4_find_entry(dir, name, dirent, inline) \ ext4_find_entry_locked(dir, name, dirent, inline, NULL) -#define ext4_add_entry(handle, dentry, inode) \ - ext4_add_entry_locked(handle, dentry, inode, NULL) /* NB: ext4_lblk_t is 32 bits so we use high bits to identify invalid blk */ #define EXT4_HTREE_NODE_CHANGED (0xcafeULL << 32) +inline int ext4_add_entry(handle_t *handle, struct dentry *dentry, + struct inode *inode) +{ + int ret = ext4_add_entry_locked(handle, dentry, inode, NULL); + + if (ret == -ENOBUFS) + ret = 0; + return ret; +} + static void ext4_htree_event_cb(void *target, void *event) { u64 *block = (u64 *)target; @@ -2612,6 +2620,55 @@ static int ext4_update_dotdot(handle_t *handle, struct dentry *dentry, return err; } +static unsigned long __ext4_max_dir_size(struct dx_frame *frames, + struct dx_frame *frame, + struct inode *dir) +{ + unsigned long max_dir_size; + + if (EXT4_SB(dir->i_sb)->s_max_dir_size_kb) { + max_dir_size = EXT4_SB(dir->i_sb)->s_max_dir_size_kb << 10; + } else { + max_dir_size = EXT4_BLOCK_SIZE(dir->i_sb); + while (frame >= frames) { + max_dir_size *= dx_get_limit(frame->entries); + if (frame == frames) + break; + frame--; + } + /* use 75% of max dir size in average */ + max_dir_size = max_dir_size / 4 * 3; + } + return max_dir_size; +} + +/* + * With hash tree growing, it is easy to hit ENOSPC, but it is hard + * to predict when it will happen. let's give administrators warning + * when reaching 3/5 and 2/3 of limit + */ +static inline bool dir_size_in_warning_range(struct dx_frame *frames, + struct dx_frame *frame, + struct inode *dir) +{ + struct super_block *sb = dir->i_sb; + unsigned long size1, size2; + + if (unlikely(!EXT4_SB(sb)->s_warning_dir_size)) + EXT4_SB(sb)->s_warning_dir_size = + __ext4_max_dir_size(frames, frame, dir); + + size1 = EXT4_SB(sb)->s_warning_dir_size / 16 * 10; + size1 = size1 & ~(EXT4_BLOCK_SIZE(sb) - 1); + size2 = EXT4_SB(sb)->s_warning_dir_size / 16 * 11; + size2 = size2 & ~(EXT4_BLOCK_SIZE(sb) - 1); + if (in_range(dir->i_size, size1, EXT4_BLOCK_SIZE(sb)) || + in_range(dir->i_size, size2, EXT4_BLOCK_SIZE(sb))) + return true; + + return false; +} + /* * ext4_add_entry() * @@ -2739,6 +2796,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, struct buffer_head *bh; struct super_block *sb = dir->i_sb; struct ext4_dir_entry_2 *de; + bool ret_warn = false; int restart; int err; @@ -2769,6 +2827,11 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, /* Block full, should compress but for now just split */ dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n", dx_get_count(entries), dx_get_limit(entries))); + + if (frame - frames + 1 >= ext4_dir_htree_level(sb) || + EXT4_SB(sb)->s_warning_dir_size) + ret_warn = dir_size_in_warning_range(frames, frame, dir); + /* Need to split index? */ if (dx_get_count(entries) == dx_get_limit(entries)) { ext4_lblk_t newblock; @@ -2935,6 +2998,8 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, */ if (restart && err == 0) goto again; + if (err == 0 && ret_warn) + err = -ENOBUFS; return err; } diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 07242d7..a3179b2 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -1901,6 +1901,8 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, sbi->s_li_wait_mult = arg; } else if (token == Opt_max_dir_size_kb) { sbi->s_max_dir_size_kb = arg; + /* reset s_warning_dir_size and make it re-calculated */ + sbi->s_warning_dir_size = 0; } else if (token == Opt_stripe) { sbi->s_stripe = arg; } else if (token == Opt_resuid) { diff --git a/fs/ext4/sysfs.c b/fs/ext4/sysfs.c index 3a71a16..575f318 100644 --- a/fs/ext4/sysfs.c +++ b/fs/ext4/sysfs.c @@ -182,6 +182,7 @@ static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) EXT4_RW_ATTR_SBI_UI(inode_goal, s_inode_goal); EXT4_RW_ATTR_SBI_UI(max_dir_size, s_max_dir_size_kb); EXT4_RW_ATTR_SBI_UI(max_dir_size_kb, s_max_dir_size_kb); +EXT4_RW_ATTR_SBI_UI(warning_dir_size, s_warning_dir_size); EXT4_RW_ATTR_SBI_UI(mb_stats, s_mb_stats); EXT4_RW_ATTR_SBI_UI(mb_max_to_scan, s_mb_max_to_scan); EXT4_RW_ATTR_SBI_UI(mb_min_to_scan, s_mb_min_to_scan); @@ -214,6 +215,7 @@ static ssize_t journal_task_show(struct ext4_sb_info *sbi, char *buf) ATTR_LIST(inode_goal), ATTR_LIST(max_dir_size), ATTR_LIST(max_dir_size_kb), + ATTR_LIST(warning_dir_size), ATTR_LIST(mb_stats), ATTR_LIST(mb_max_to_scan), ATTR_LIST(mb_min_to_scan), -- 1.8.3.1