From 22098763a10d9c1340827fcf6edab66f153b27f0 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 13 Sep 2026 12:27:00 -0700 Subject: Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Don't destroy user event fields when removal fails User event fields are destroyed before the event is removed from visibility. But that can fail leaving the still visible event with no fields. Move the destroying of the fields to after the event is successfully removed from visibility. - Initialize function graph state is fork before calling copy_exec_state() For non-CLONE_VM forks, copy_exec_state() allocates a new task_exec_state. If that allocation fails, ftrace_graph_exit_task() will free the tasks ret_stack pointer. Since that pointer is still using the parent's ret_stack, it mistakenly frees the parent's pointer too. Call ftrace_graph_init() on the task first which will NULL out the new tasks's ret_stack and if the copy fails, it will not free anything. - Remove FGRAPH_MAX_INDEX The macro FGRAPH_MAX_INDEX was added but never used. Remove it. - Save ent_size in function graph printing of nested functions The function graph tracer needs to look at the next event to see if the next event is the return of the current function entry. If it is, it prints a single line: ktime_get(); Otherwise it prints it like a nested function: tick_nohz_irq_exit() { ktime_get(); kcpustat_irq_exit(); } In order to look at the next event, it must save the current event so that it has the information to print from it. It saves the event in the iterator descriptor called "ent". What it doesn't save is the ent_size of the event which is now used to know if the function graph arguments are to be printed. The peek doesn't save the size so the size used happens to be that of the size of the last event that was seen. Save the entry event size in the iterator descriptor so that the correct size is used. - Fix several errors with freeing data in the histogram code The histogram code had a lot of leaked or or incorrect accounting when failures happen. Correct them. - Fix histogram regression of .percent and .graph modifiers Up until 6.3 histogram values could have "percent" or "graph" modifiers that changed how they were printed. But a change that added restricting histograms values from being strings, stack traces and other modifiers inadvertently prevented them from using the percent and graph modifiers, which were legal use cases for values. Put back the percent and graph modifiers. - Fix various typos in the comments - Set the trace_clock before initializing a histogram with clock argument The histogram API allows the user to specific which trace clock to use via a "clock=" string. The histogram is set up first before the clock is checked. If the passed in clock is not valid, it exits without fully fixing up the histogram leaving it on the list and a use-after-free can trigger. Update the clock argument first and if it fails then exit gracefully before the histogram trigger is placed on any lists. - Restore :mod: trailer after parsing in ftrace_set_clr_event The function ftrace_set_clr_event() modifies the parse string and needs to put it back to what was passed in. It searches for ":mod:" via a strsep() but fails to put back the first ':' in the string. Add back the ':' in the passed in string. - Take trace_array reference when opening a tracer options file The options files are dynamically created and some tracers add their own options. When a tracer adds their own list of options, the trace_array holding them has an array to hold the list of options for each tracer. This array increases in size via a krealloc(), and the new entry gets a newly allocated array to hold the options of the new tracer being added. The element in each entry of the tracer's option array holds a pointer back to the trace_array, a pointer to the tracer it is associated to, a pointer to the flags of the option. The issue is that these arrays are freed when the trace_array is freed when its instance it represents is removed from the instances directory. There's a race that an open of one of these options files can happen when the instance is being removed. Add a new helper function to be called by the open function of the options file to iterate all existing trace_arrays under a lock and find the one that has the given option element in one of it's tracer arrays. If found, then update the associated trace_array's reference counter to keep it from being freed. If not found, have the open call return -ENODEV. - Disable interrupts when acquiring the lock in rb_wake_up_waiters() The function rb_wake_up_waiters() assumes it will be called in interrupt context and does not disable irqs when taking cpu_buffer->reader_lock, which can be called in hard interrupt context. The issue is in PREEMPT_RT, this function is called in thread context leaving this lock open to a deadlock. Take the lock with interrupts disabled. - Use rcu_assign_pointer() for tmp_ops filter hash The tmp_ops used in update_ftrace_direct_mod() assigns its filter_hash field directly, but that field is annotated as __rcu and sparse complains. Assign it with rcu_assign_pointer() - Fix use-after-free in enable_trigger_private_data_free() The trace_event_call is accessed through the event_trigger_data's trace_event_file pointer to put the trace_event_call on freeing. The issue is that the trace_event_file data may have been freed already causing a use-after-free. Add a field to the event_trigger_data that points directly to the trace_event_call so that it can decrement its reference directly without needing to go through the trace_event_file. - Fix accounting of buffer data remote headers trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount the number of pages is needed for the asked for size as it doesn't take into account the meta data on each page. Add a helper function to do the calculation properly and use that in these functions. - Catch nr_page_va overflow in ring_buffer_desc sizing The number of pages per remote ring buffer is capped by ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to overflow that field would silently allocate a descriptor smaller than what was asked for. - Do not resize the subbuf order if any per_cpu buffer is disabled The mmapping of ring buffers disables resizing the subbuffers, but it is done per-cpu whereas the subbuf size change is done for all the per_cpu buffers under the buffer->mutex. It could change the size of some while the mapping is happening on others. Have the resize of the subbuf order check all the per_cpu buffers under the lock to see if any of them is disabled before starting and causing an inconsistency between buffers that are being mapped. * tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits) ring-buffer: Check resize_disabled before publishing the new subbuf order tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing tracing/remotes: Account for ring buffer page header in size calculation tracing: Don't dereference trace_event_file in deferred trigger free ftrace: Use rcu_assign_pointer() for tmp_ops filter hash ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters() tracing: Take trace_array reference when opening a tracer options file tracing: Fix ring_buffer_read_page_size() kernel-doc tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event() tracing: Fix memory corruption from a "STACKTRACE" histogram key tracing: Fix memory corruption from the histogram stacktrace modifier tracing: Undo the registration when enabling the histogram trigger fails tracing: Take the reference before publishing the named histogram trigger tracing: Set the trace clock before registering the histogram trigger tracing: Fix typo "preceeded" in comment tracing: Fix typo "availabe" in comment tracing: Let histogram values keep the percent and graph modifiers tracing: Keep the entry count when the histogram stats allocation fails tracing: Free histogram the field rejected for a bad modifier tracing: Free histogram the var ref when its initialization fails ... --- fs/nilfs2/alloc.c | 958 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 958 insertions(+) create mode 100644 fs/nilfs2/alloc.c (limited to 'fs/nilfs2/alloc.c') diff --git a/fs/nilfs2/alloc.c b/fs/nilfs2/alloc.c new file mode 100644 index 000000000..7b1cd2bae --- /dev/null +++ b/fs/nilfs2/alloc.c @@ -0,0 +1,958 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * NILFS dat/inode allocator + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * Originally written by Koji Sato. + * Two allocators were unified by Ryusuke Konishi and Amagai Yoshiji. + */ + +#include +#include +#include +#include +#include +#include "mdt.h" +#include "alloc.h" + + +/** + * nilfs_palloc_groups_per_desc_block - get the number of groups that a group + * descriptor block can maintain + * @inode: inode of metadata file using this allocator + * + * Return: Number of groups that a group descriptor block can maintain. + */ +static inline unsigned long +nilfs_palloc_groups_per_desc_block(const struct inode *inode) +{ + return i_blocksize(inode) / + sizeof(struct nilfs_palloc_group_desc); +} + +/** + * nilfs_palloc_groups_count - get maximum number of groups + * @inode: inode of metadata file using this allocator + * + * Return: Maximum number of groups. + */ +static inline unsigned long +nilfs_palloc_groups_count(const struct inode *inode) +{ + return 1UL << (BITS_PER_LONG - (inode->i_blkbits + 3 /* log2(8) */)); +} + +/** + * nilfs_palloc_init_blockgroup - initialize private variables for allocator + * @inode: inode of metadata file using this allocator + * @entry_size: size of the persistent object + * + * Return: 0 on success, or a negative error code on failure. + */ +int nilfs_palloc_init_blockgroup(struct inode *inode, unsigned int entry_size) +{ + struct nilfs_mdt_info *mi = NILFS_MDT(inode); + + mi->mi_bgl = kmalloc_obj(*mi->mi_bgl, GFP_NOFS); + if (!mi->mi_bgl) + return -ENOMEM; + + bgl_lock_init(mi->mi_bgl); + + nilfs_mdt_set_entry_size(inode, entry_size, 0); + + mi->mi_blocks_per_group = + DIV_ROUND_UP(nilfs_palloc_entries_per_group(inode), + mi->mi_entries_per_block) + 1; + /* + * Number of blocks in a group including entry blocks + * and a bitmap block + */ + mi->mi_blocks_per_desc_block = + nilfs_palloc_groups_per_desc_block(inode) * + mi->mi_blocks_per_group + 1; + /* + * Number of blocks per descriptor including the + * descriptor block + */ + return 0; +} + +/** + * nilfs_palloc_group - get group number and offset from an entry number + * @inode: inode of metadata file using this allocator + * @nr: serial number of the entry (e.g. inode number) + * @offset: pointer to store offset number in the group + * + * Return: Number of the group that contains the entry with the index + * specified by @nr. + */ +static unsigned long nilfs_palloc_group(const struct inode *inode, __u64 nr, + unsigned long *offset) +{ + __u64 group = nr; + + *offset = do_div(group, nilfs_palloc_entries_per_group(inode)); + return group; +} + +/** + * nilfs_palloc_desc_blkoff - get block offset of a group descriptor block + * @inode: inode of metadata file using this allocator + * @group: group number + * + * Return: Index number in the metadata file of the descriptor block of + * the group specified by @group. + */ +static unsigned long +nilfs_palloc_desc_blkoff(const struct inode *inode, unsigned long group) +{ + unsigned long desc_block = + group / nilfs_palloc_groups_per_desc_block(inode); + return desc_block * NILFS_MDT(inode)->mi_blocks_per_desc_block; +} + +/** + * nilfs_palloc_bitmap_blkoff - get block offset of a bitmap block + * @inode: inode of metadata file using this allocator + * @group: group number + * + * nilfs_palloc_bitmap_blkoff() returns block offset of the bitmap + * block used to allocate/deallocate entries in the specified group. + * + * Return: Index number in the metadata file of the bitmap block of + * the group specified by @group. + */ +static unsigned long +nilfs_palloc_bitmap_blkoff(const struct inode *inode, unsigned long group) +{ + unsigned long desc_offset = + group % nilfs_palloc_groups_per_desc_block(inode); + return nilfs_palloc_desc_blkoff(inode, group) + 1 + + desc_offset * NILFS_MDT(inode)->mi_blocks_per_group; +} + +/** + * nilfs_palloc_group_desc_nfrees - get the number of free entries in a group + * @desc: pointer to descriptor structure for the group + * @lock: spin lock protecting @desc + * + * Return: Number of free entries written in the group descriptor @desc. + */ +static unsigned long +nilfs_palloc_group_desc_nfrees(const struct nilfs_palloc_group_desc *desc, + spinlock_t *lock) +{ + unsigned long nfree; + + spin_lock(lock); + nfree = le32_to_cpu(desc->pg_nfrees); + spin_unlock(lock); + return nfree; +} + +/** + * nilfs_palloc_group_desc_add_entries - adjust count of free entries + * @desc: pointer to descriptor structure for the group + * @lock: spin lock protecting @desc + * @n: delta to be added + * + * Return: Number of free entries after adjusting the group descriptor + * @desc. + */ +static u32 +nilfs_palloc_group_desc_add_entries(struct nilfs_palloc_group_desc *desc, + spinlock_t *lock, u32 n) +{ + u32 nfree; + + spin_lock(lock); + le32_add_cpu(&desc->pg_nfrees, n); + nfree = le32_to_cpu(desc->pg_nfrees); + spin_unlock(lock); + return nfree; +} + +/** + * nilfs_palloc_entry_blkoff - get block offset of an entry block + * @inode: inode of metadata file using this allocator + * @nr: serial number of the entry (e.g. inode number) + * + * Return: Index number in the metadata file of the block containing + * the entry specified by @nr. + */ +static unsigned long +nilfs_palloc_entry_blkoff(const struct inode *inode, __u64 nr) +{ + unsigned long group, group_offset; + + group = nilfs_palloc_group(inode, nr, &group_offset); + + return nilfs_palloc_bitmap_blkoff(inode, group) + 1 + + group_offset / NILFS_MDT(inode)->mi_entries_per_block; +} + +/** + * nilfs_palloc_desc_block_init - initialize buffer of a group descriptor block + * @inode: inode of metadata file + * @bh: buffer head of the buffer to be initialized + * @from: kernel address mapped for a chunk of the block + * + * This function does not yet support the case where block size > PAGE_SIZE. + */ +static void nilfs_palloc_desc_block_init(struct inode *inode, + struct buffer_head *bh, void *from) +{ + struct nilfs_palloc_group_desc *desc = from; + unsigned long n = nilfs_palloc_groups_per_desc_block(inode); + __le32 nfrees; + + nfrees = cpu_to_le32(nilfs_palloc_entries_per_group(inode)); + while (n-- > 0) { + desc->pg_nfrees = nfrees; + desc++; + } +} + +static int nilfs_palloc_get_block(struct inode *inode, unsigned long blkoff, + int create, + void (*init_block)(struct inode *, + struct buffer_head *, + void *), + struct buffer_head **bhp, + struct nilfs_bh_assoc *prev, + spinlock_t *lock) +{ + int ret; + + spin_lock(lock); + if (prev->bh && blkoff == prev->blkoff && + likely(buffer_uptodate(prev->bh))) { + get_bh(prev->bh); + *bhp = prev->bh; + spin_unlock(lock); + return 0; + } + spin_unlock(lock); + + ret = nilfs_mdt_get_block(inode, blkoff, create, init_block, bhp); + if (!ret) { + spin_lock(lock); + /* + * The following code must be safe for change of the + * cache contents during the get block call. + */ + brelse(prev->bh); + get_bh(*bhp); + prev->bh = *bhp; + prev->blkoff = blkoff; + spin_unlock(lock); + } + return ret; +} + +/** + * nilfs_palloc_delete_block - delete a block on the persistent allocator file + * @inode: inode of metadata file using this allocator + * @blkoff: block offset + * @prev: nilfs_bh_assoc struct of the last used buffer + * @lock: spin lock protecting @prev + * + * Return: 0 on success, or one of the following negative error codes on + * failure: + * * %-EIO - I/O error (including metadata corruption). + * * %-ENOENT - Non-existent block. + * * %-ENOMEM - Insufficient memory available. + */ +static int nilfs_palloc_delete_block(struct inode *inode, unsigned long blkoff, + struct nilfs_bh_assoc *prev, + spinlock_t *lock) +{ + spin_lock(lock); + if (prev->bh && blkoff == prev->blkoff) { + brelse(prev->bh); + prev->bh = NULL; + } + spin_unlock(lock); + return nilfs_mdt_delete_block(inode, blkoff); +} + +/** + * nilfs_palloc_get_desc_block - get buffer head of a group descriptor block + * @inode: inode of metadata file using this allocator + * @group: group number + * @create: create flag + * @bhp: pointer to store the resultant buffer head + * + * Return: 0 on success, or a negative error code on failure. + */ +static int nilfs_palloc_get_desc_block(struct inode *inode, + unsigned long group, + int create, struct buffer_head **bhp) +{ + struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; + + return nilfs_palloc_get_block(inode, + nilfs_palloc_desc_blkoff(inode, group), + create, nilfs_palloc_desc_block_init, + bhp, &cache->prev_desc, &cache->lock); +} + +/** + * nilfs_palloc_get_bitmap_block - get buffer head of a bitmap block + * @inode: inode of metadata file using this allocator + * @group: group number + * @create: create flag + * @bhp: pointer to store the resultant buffer head + * + * Return: 0 on success, or a negative error code on failure. + */ +static int nilfs_palloc_get_bitmap_block(struct inode *inode, + unsigned long group, + int create, struct buffer_head **bhp) +{ + struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; + + return nilfs_palloc_get_block(inode, + nilfs_palloc_bitmap_blkoff(inode, group), + create, NULL, bhp, + &cache->prev_bitmap, &cache->lock); +} + +/** + * nilfs_palloc_delete_bitmap_block - delete a bitmap block + * @inode: inode of metadata file using this allocator + * @group: group number + * + * Return: 0 on success, or a negative error code on failure. + */ +static int nilfs_palloc_delete_bitmap_block(struct inode *inode, + unsigned long group) +{ + struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; + + return nilfs_palloc_delete_block(inode, + nilfs_palloc_bitmap_blkoff(inode, + group), + &cache->prev_bitmap, &cache->lock); +} + +/** + * nilfs_palloc_get_entry_block - get buffer head of an entry block + * @inode: inode of metadata file using this allocator + * @nr: serial number of the entry (e.g. inode number) + * @create: create flag + * @bhp: pointer to store the resultant buffer head + * + * Return: 0 on success, or a negative error code on failure. + */ +int nilfs_palloc_get_entry_block(struct inode *inode, __u64 nr, + int create, struct buffer_head **bhp) +{ + struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; + + return nilfs_palloc_get_block(inode, + nilfs_palloc_entry_blkoff(inode, nr), + create, NULL, bhp, + &cache->prev_entry, &cache->lock); +} + +/** + * nilfs_palloc_delete_entry_block - delete an entry block + * @inode: inode of metadata file using this allocator + * @nr: serial number of the entry + * + * Return: 0 on success, or a negative error code on failure. + */ +static int nilfs_palloc_delete_entry_block(struct inode *inode, __u64 nr) +{ + struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; + + return nilfs_palloc_delete_block(inode, + nilfs_palloc_entry_blkoff(inode, nr), + &cache->prev_entry, &cache->lock); +} + +/** + * nilfs_palloc_group_desc_offset - calculate the byte offset of a group + * descriptor in the folio containing it + * @inode: inode of metadata file using this allocator + * @group: group number + * @bh: buffer head of the group descriptor block + * + * Return: Byte offset in the folio of the group descriptor for @group. + */ +static size_t nilfs_palloc_group_desc_offset(const struct inode *inode, + unsigned long group, + const struct buffer_head *bh) +{ + return offset_in_folio(bh->b_folio, bh->b_data) + + sizeof(struct nilfs_palloc_group_desc) * + (group % nilfs_palloc_groups_per_desc_block(inode)); +} + +/** + * nilfs_palloc_bitmap_offset - calculate the byte offset of a bitmap block + * in the folio containing it + * @bh: buffer head of the bitmap block + * + * Return: Byte offset in the folio of the bitmap block for @bh. + */ +static size_t nilfs_palloc_bitmap_offset(const struct buffer_head *bh) +{ + return offset_in_folio(bh->b_folio, bh->b_data); +} + +/** + * nilfs_palloc_entry_offset - calculate the byte offset of an entry in the + * folio containing it + * @inode: inode of metadata file using this allocator + * @nr: serial number of the entry (e.g. inode number) + * @bh: buffer head of the entry block + * + * Return: Byte offset in the folio of the entry @nr. + */ +size_t nilfs_palloc_entry_offset(const struct inode *inode, __u64 nr, + const struct buffer_head *bh) +{ + unsigned long entry_index_in_group, entry_index_in_block; + + nilfs_palloc_group(inode, nr, &entry_index_in_group); + entry_index_in_block = entry_index_in_group % + NILFS_MDT(inode)->mi_entries_per_block; + + return offset_in_folio(bh->b_folio, bh->b_data) + + entry_index_in_block * NILFS_MDT(inode)->mi_entry_size; +} + +/** + * nilfs_palloc_find_available_slot - find available slot in a group + * @bitmap: bitmap of the group + * @target: offset number of an entry in the group (start point) + * @bsize: size in bits + * @lock: spin lock protecting @bitmap + * @wrap: whether to wrap around + * + * Return: Offset number within the group of the found free entry, or + * %-ENOSPC if not found. + */ +static int nilfs_palloc_find_available_slot(unsigned char *bitmap, + unsigned long target, + unsigned int bsize, + spinlock_t *lock, bool wrap) +{ + int pos, end = bsize; + + if (likely(target < bsize)) { + pos = target; + do { + pos = nilfs_find_next_zero_bit(bitmap, end, pos); + if (pos >= end) + break; + if (!nilfs_set_bit_atomic(lock, pos, bitmap)) + return pos; + } while (++pos < end); + + end = target; + } + if (!wrap) + return -ENOSPC; + + /* wrap around */ + for (pos = 0; pos < end; pos++) { + pos = nilfs_find_next_zero_bit(bitmap, end, pos); + if (pos >= end) + break; + if (!nilfs_set_bit_atomic(lock, pos, bitmap)) + return pos; + } + + return -ENOSPC; +} + +/** + * nilfs_palloc_rest_groups_in_desc_block - get the remaining number of groups + * in a group descriptor block + * @inode: inode of metadata file using this allocator + * @curr: current group number + * @max: maximum number of groups + * + * Return: Number of remaining descriptors (= groups) managed by the descriptor + * block. + */ +static unsigned long +nilfs_palloc_rest_groups_in_desc_block(const struct inode *inode, + unsigned long curr, unsigned long max) +{ + return min_t(unsigned long, + nilfs_palloc_groups_per_desc_block(inode) - + curr % nilfs_palloc_groups_per_desc_block(inode), + max - curr + 1); +} + +/** + * nilfs_palloc_count_desc_blocks - count descriptor blocks number + * @inode: inode of metadata file using this allocator + * @desc_blocks: descriptor blocks number [out] + * + * Return: 0 on success, or a negative error code on failure. + */ +static int nilfs_palloc_count_desc_blocks(struct inode *inode, + unsigned long *desc_blocks) +{ + __u64 blknum; + int ret; + + ret = nilfs_bmap_last_key(NILFS_I(inode)->i_bmap, &blknum); + if (likely(!ret)) + *desc_blocks = DIV_ROUND_UP( + (unsigned long)blknum, + NILFS_MDT(inode)->mi_blocks_per_desc_block); + return ret; +} + +/** + * nilfs_palloc_mdt_file_can_grow - check potential opportunity for + * MDT file growing + * @inode: inode of metadata file using this allocator + * @desc_blocks: known current descriptor blocks count + * + * Return: true if a group can be added in the metadata file, false if not. + */ +static inline bool nilfs_palloc_mdt_file_can_grow(struct inode *inode, + unsigned long desc_blocks) +{ + return (nilfs_palloc_groups_per_desc_block(inode) * desc_blocks) < + nilfs_palloc_groups_count(inode); +} + +/** + * nilfs_palloc_count_max_entries - count max number of entries that can be + * described by descriptor blocks count + * @inode: inode of metadata file using this allocator + * @nused: current number of used entries + * @nmaxp: max number of entries [out] + * + * Return: 0 on success, or one of the following negative error codes on + * failure: + * * %-EIO - I/O error (including metadata corruption). + * * %-ENOMEM - Insufficient memory available. + * * %-ERANGE - Number of entries in use is out of range. + */ +int nilfs_palloc_count_max_entries(struct inode *inode, u64 nused, u64 *nmaxp) +{ + unsigned long desc_blocks = 0; + u64 entries_per_desc_block, nmax; + int err; + + err = nilfs_palloc_count_desc_blocks(inode, &desc_blocks); + if (unlikely(err)) + return err; + + entries_per_desc_block = (u64)nilfs_palloc_entries_per_group(inode) * + nilfs_palloc_groups_per_desc_block(inode); + nmax = entries_per_desc_block * desc_blocks; + + if (nused == nmax && + nilfs_palloc_mdt_file_can_grow(inode, desc_blocks)) + nmax += entries_per_desc_block; + + if (nused > nmax) + return -ERANGE; + + *nmaxp = nmax; + return 0; +} + +/** + * nilfs_palloc_prepare_alloc_entry - prepare to allocate a persistent object + * @inode: inode of metadata file using this allocator + * @req: nilfs_palloc_req structure exchanged for the allocation + * @wrap: whether to wrap around + * + * Return: 0 on success, or one of the following negative error codes on + * failure: + * * %-EIO - I/O error (including metadata corruption). + * * %-ENOMEM - Insufficient memory available. + * * %-ENOSPC - Entries exhausted (No entries available for allocation). + * * %-EROFS - Read only filesystem + */ +int nilfs_palloc_prepare_alloc_entry(struct inode *inode, + struct nilfs_palloc_req *req, bool wrap) +{ + struct buffer_head *desc_bh, *bitmap_bh; + struct nilfs_palloc_group_desc *desc; + unsigned char *bitmap; + size_t doff, boff; + unsigned long group, maxgroup, ngroups; + unsigned long group_offset, maxgroup_offset; + unsigned long n, entries_per_group; + unsigned long i, j; + spinlock_t *lock; + int pos, ret; + + ngroups = nilfs_palloc_groups_count(inode); + maxgroup = ngroups - 1; + group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); + entries_per_group = nilfs_palloc_entries_per_group(inode); + + for (i = 0; i < ngroups; i += n) { + if (group >= ngroups && wrap) { + /* wrap around */ + group = 0; + maxgroup = nilfs_palloc_group(inode, req->pr_entry_nr, + &maxgroup_offset) - 1; + } + ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh); + if (ret < 0) + return ret; + + doff = nilfs_palloc_group_desc_offset(inode, group, desc_bh); + desc = kmap_local_folio(desc_bh->b_folio, doff); + n = nilfs_palloc_rest_groups_in_desc_block(inode, group, + maxgroup); + for (j = 0; j < n; j++, group++, group_offset = 0) { + lock = nilfs_mdt_bgl_lock(inode, group); + if (nilfs_palloc_group_desc_nfrees(&desc[j], lock) == 0) + continue; + + kunmap_local(desc); + ret = nilfs_palloc_get_bitmap_block(inode, group, 1, + &bitmap_bh); + if (unlikely(ret < 0)) { + brelse(desc_bh); + return ret; + } + + /* + * Re-kmap the folio containing the first (and + * subsequent) group descriptors. + */ + desc = kmap_local_folio(desc_bh->b_folio, doff); + + boff = nilfs_palloc_bitmap_offset(bitmap_bh); + bitmap = kmap_local_folio(bitmap_bh->b_folio, boff); + pos = nilfs_palloc_find_available_slot( + bitmap, group_offset, entries_per_group, lock, + wrap); + /* + * Since the search for a free slot in the second and + * subsequent bitmap blocks always starts from the + * beginning, the wrap flag only has an effect on the + * first search. + */ + kunmap_local(bitmap); + if (pos >= 0) + goto found; + + brelse(bitmap_bh); + } + + kunmap_local(desc); + brelse(desc_bh); + } + + /* no entries left */ + return -ENOSPC; + +found: + /* found a free entry */ + nilfs_palloc_group_desc_add_entries(&desc[j], lock, -1); + req->pr_entry_nr = entries_per_group * group + pos; + kunmap_local(desc); + + req->pr_desc_bh = desc_bh; + req->pr_bitmap_bh = bitmap_bh; + return 0; +} + +/** + * nilfs_palloc_commit_alloc_entry - finish allocation of a persistent object + * @inode: inode of metadata file using this allocator + * @req: nilfs_palloc_req structure exchanged for the allocation + */ +void nilfs_palloc_commit_alloc_entry(struct inode *inode, + struct nilfs_palloc_req *req) +{ + mark_buffer_dirty(req->pr_bitmap_bh); + mark_buffer_dirty(req->pr_desc_bh); + nilfs_mdt_mark_dirty(inode); + + brelse(req->pr_bitmap_bh); + brelse(req->pr_desc_bh); +} + +/** + * nilfs_palloc_commit_free_entry - finish deallocating a persistent object + * @inode: inode of metadata file using this allocator + * @req: nilfs_palloc_req structure exchanged for the removal + */ +void nilfs_palloc_commit_free_entry(struct inode *inode, + struct nilfs_palloc_req *req) +{ + unsigned long group, group_offset; + size_t doff, boff; + struct nilfs_palloc_group_desc *desc; + unsigned char *bitmap; + spinlock_t *lock; + + group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); + doff = nilfs_palloc_group_desc_offset(inode, group, req->pr_desc_bh); + desc = kmap_local_folio(req->pr_desc_bh->b_folio, doff); + + boff = nilfs_palloc_bitmap_offset(req->pr_bitmap_bh); + bitmap = kmap_local_folio(req->pr_bitmap_bh->b_folio, boff); + lock = nilfs_mdt_bgl_lock(inode, group); + + if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap)) + nilfs_warn(inode->i_sb, + "%s (ino=%llu): entry number %llu already freed", + __func__, inode->i_ino, + (unsigned long long)req->pr_entry_nr); + else + nilfs_palloc_group_desc_add_entries(desc, lock, 1); + + kunmap_local(bitmap); + kunmap_local(desc); + + mark_buffer_dirty(req->pr_desc_bh); + mark_buffer_dirty(req->pr_bitmap_bh); + nilfs_mdt_mark_dirty(inode); + + brelse(req->pr_bitmap_bh); + brelse(req->pr_desc_bh); +} + +/** + * nilfs_palloc_abort_alloc_entry - cancel allocation of a persistent object + * @inode: inode of metadata file using this allocator + * @req: nilfs_palloc_req structure exchanged for the allocation + */ +void nilfs_palloc_abort_alloc_entry(struct inode *inode, + struct nilfs_palloc_req *req) +{ + struct nilfs_palloc_group_desc *desc; + size_t doff, boff; + unsigned char *bitmap; + unsigned long group, group_offset; + spinlock_t *lock; + + group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); + doff = nilfs_palloc_group_desc_offset(inode, group, req->pr_desc_bh); + desc = kmap_local_folio(req->pr_desc_bh->b_folio, doff); + + boff = nilfs_palloc_bitmap_offset(req->pr_bitmap_bh); + bitmap = kmap_local_folio(req->pr_bitmap_bh->b_folio, boff); + lock = nilfs_mdt_bgl_lock(inode, group); + + if (!nilfs_clear_bit_atomic(lock, group_offset, bitmap)) + nilfs_warn(inode->i_sb, + "%s (ino=%llu): entry number %llu already freed", + __func__, inode->i_ino, + (unsigned long long)req->pr_entry_nr); + else + nilfs_palloc_group_desc_add_entries(desc, lock, 1); + + kunmap_local(bitmap); + kunmap_local(desc); + + brelse(req->pr_bitmap_bh); + brelse(req->pr_desc_bh); + + req->pr_entry_nr = 0; + req->pr_bitmap_bh = NULL; + req->pr_desc_bh = NULL; +} + +/** + * nilfs_palloc_prepare_free_entry - prepare to deallocate a persistent object + * @inode: inode of metadata file using this allocator + * @req: nilfs_palloc_req structure exchanged for the removal + * + * Return: 0 on success, or a negative error code on failure. + */ +int nilfs_palloc_prepare_free_entry(struct inode *inode, + struct nilfs_palloc_req *req) +{ + struct buffer_head *desc_bh, *bitmap_bh; + unsigned long group, group_offset; + int ret; + + group = nilfs_palloc_group(inode, req->pr_entry_nr, &group_offset); + ret = nilfs_palloc_get_desc_block(inode, group, 1, &desc_bh); + if (ret < 0) + return ret; + ret = nilfs_palloc_get_bitmap_block(inode, group, 1, &bitmap_bh); + if (ret < 0) { + brelse(desc_bh); + return ret; + } + + req->pr_desc_bh = desc_bh; + req->pr_bitmap_bh = bitmap_bh; + return 0; +} + +/** + * nilfs_palloc_abort_free_entry - cancel deallocating a persistent object + * @inode: inode of metadata file using this allocator + * @req: nilfs_palloc_req structure exchanged for the removal + */ +void nilfs_palloc_abort_free_entry(struct inode *inode, + struct nilfs_palloc_req *req) +{ + brelse(req->pr_bitmap_bh); + brelse(req->pr_desc_bh); + + req->pr_entry_nr = 0; + req->pr_bitmap_bh = NULL; + req->pr_desc_bh = NULL; +} + +/** + * nilfs_palloc_freev - deallocate a set of persistent objects + * @inode: inode of metadata file using this allocator + * @entry_nrs: array of entry numbers to be deallocated + * @nitems: number of entries stored in @entry_nrs + * + * Return: 0 on success, or a negative error code on failure. + */ +int nilfs_palloc_freev(struct inode *inode, __u64 *entry_nrs, size_t nitems) +{ + struct buffer_head *desc_bh, *bitmap_bh; + struct nilfs_palloc_group_desc *desc; + unsigned char *bitmap; + size_t doff, boff; + unsigned long group, group_offset; + __u64 group_min_nr, last_nrs[8]; + const unsigned long epg = nilfs_palloc_entries_per_group(inode); + const unsigned int epb = NILFS_MDT(inode)->mi_entries_per_block; + unsigned int entry_start, end, pos; + spinlock_t *lock; + int i, j, k, ret; + u32 nfree; + + for (i = 0; i < nitems; i = j) { + int change_group = false; + int nempties = 0, n = 0; + + group = nilfs_palloc_group(inode, entry_nrs[i], &group_offset); + ret = nilfs_palloc_get_desc_block(inode, group, 0, &desc_bh); + if (ret < 0) + return ret; + ret = nilfs_palloc_get_bitmap_block(inode, group, 0, + &bitmap_bh); + if (ret < 0) { + brelse(desc_bh); + return ret; + } + + /* Get the first entry number of the group */ + group_min_nr = (__u64)group * epg; + + boff = nilfs_palloc_bitmap_offset(bitmap_bh); + bitmap = kmap_local_folio(bitmap_bh->b_folio, boff); + lock = nilfs_mdt_bgl_lock(inode, group); + + j = i; + entry_start = rounddown(group_offset, epb); + do { + if (!nilfs_clear_bit_atomic(lock, group_offset, + bitmap)) { + nilfs_warn(inode->i_sb, + "%s (ino=%llu): entry number %llu already freed", + __func__, inode->i_ino, + (unsigned long long)entry_nrs[j]); + } else { + n++; + } + + j++; + if (j >= nitems || entry_nrs[j] < group_min_nr || + entry_nrs[j] >= group_min_nr + epg) { + change_group = true; + } else { + group_offset = entry_nrs[j] - group_min_nr; + if (group_offset >= entry_start && + group_offset < entry_start + epb) { + /* This entry is in the same block */ + continue; + } + } + + /* Test if the entry block is empty or not */ + end = entry_start + epb; + pos = nilfs_find_next_bit(bitmap, end, entry_start); + if (pos >= end) { + last_nrs[nempties++] = entry_nrs[j - 1]; + if (nempties >= ARRAY_SIZE(last_nrs)) + break; + } + + if (change_group) + break; + + /* Go on to the next entry block */ + entry_start = rounddown(group_offset, epb); + } while (true); + + kunmap_local(bitmap); + mark_buffer_dirty(bitmap_bh); + brelse(bitmap_bh); + + for (k = 0; k < nempties; k++) { + ret = nilfs_palloc_delete_entry_block(inode, + last_nrs[k]); + if (ret && ret != -ENOENT) + nilfs_warn(inode->i_sb, + "error %d deleting block that object (entry=%llu, ino=%llu) belongs to", + ret, (unsigned long long)last_nrs[k], + inode->i_ino); + } + + doff = nilfs_palloc_group_desc_offset(inode, group, desc_bh); + desc = kmap_local_folio(desc_bh->b_folio, doff); + nfree = nilfs_palloc_group_desc_add_entries(desc, lock, n); + kunmap_local(desc); + mark_buffer_dirty(desc_bh); + nilfs_mdt_mark_dirty(inode); + brelse(desc_bh); + + if (nfree == nilfs_palloc_entries_per_group(inode)) { + ret = nilfs_palloc_delete_bitmap_block(inode, group); + if (ret && ret != -ENOENT) + nilfs_warn(inode->i_sb, + "error %d deleting bitmap block of group=%lu, ino=%llu", + ret, group, inode->i_ino); + } + } + return 0; +} + +void nilfs_palloc_setup_cache(struct inode *inode, + struct nilfs_palloc_cache *cache) +{ + NILFS_MDT(inode)->mi_palloc_cache = cache; + spin_lock_init(&cache->lock); +} + +void nilfs_palloc_clear_cache(struct inode *inode) +{ + struct nilfs_palloc_cache *cache = NILFS_MDT(inode)->mi_palloc_cache; + + spin_lock(&cache->lock); + brelse(cache->prev_desc.bh); + brelse(cache->prev_bitmap.bh); + brelse(cache->prev_entry.bh); + cache->prev_desc.bh = NULL; + cache->prev_bitmap.bh = NULL; + cache->prev_entry.bh = NULL; + spin_unlock(&cache->lock); +} + +void nilfs_palloc_destroy_cache(struct inode *inode) +{ + nilfs_palloc_clear_cache(inode); + NILFS_MDT(inode)->mi_palloc_cache = NULL; +} -- cgit v1.3.1