// SPDX-License-Identifier: GPL-2.0+/* * NILFS block mapping. * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * Written by Koji Sato. */ #include <linux/fs.h>#include <linux/string.h>#include <linux/errno.h>#include "nilfs.h"#include "bmap.h"#include "btree.h"#include "direct.h"#include "btnode.h"#include "mdt.h"#include "dat.h"#include "alloc.h" struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap){ struct the_nilfs *nilfs = bmap->b_inode->i_sb->s_fs_info; return nilfs->ns_dat;} static int nilfs_bmap_convert_error(struct nilfs_bmap *bmap, const char *fname, int err){ struct inode *inode = bmap->b_inode; if (err == -EINVAL) { __nilfs_error(inode->i_sb, fname, "broken bmap (inode number=%llu)", inode->i_ino); err = -EIO; } return err;} /** * nilfs_bmap_lookup_at_level - find a data block or node block * @bmap: bmap * @key: key * @level: level * @ptrp: place to store the value associated to @key * * Description: nilfs_bmap_lookup_at_level() finds a record whose key * matches @key in the block at @level of the bmap. The record associated * with @key is stored in the place pointed to by @ptrp. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (including metadata corruption). * * %-ENOENT - A record associated with @key does not exist. * * %-ENOMEM - Insufficient memory available. */int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level, __u64 *ptrp){ sector_t blocknr; int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp); if (ret < 0) goto out; if (NILFS_BMAP_USE_VBN(bmap)) { ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp, &blocknr); if (!ret) *ptrp = blocknr; else if (ret == -ENOENT) { /* * If there was no valid entry in DAT for the block * address obtained by b_ops->bop_lookup, then pass * internal code -EINVAL to nilfs_bmap_convert_error * to treat it as metadata corruption. */ ret = -EINVAL; } } out: up_read(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp, unsigned int maxblocks){ int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks); up_read(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr){ __u64 keys[NILFS_BMAP_SMALL_HIGH + 1]; __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1]; int ret, n; if (bmap->b_ops->bop_check_insert != NULL) { ret = bmap->b_ops->bop_check_insert(bmap, key); if (ret > 0) { n = bmap->b_ops->bop_gather_data( bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1); if (n < 0) return n; ret = nilfs_btree_convert_and_insert( bmap, key, ptr, keys, ptrs, n); if (ret == 0) bmap->b_u.u_flags |= NILFS_BMAP_LARGE; return ret; } else if (ret < 0) return ret; } return bmap->b_ops->bop_insert(bmap, key, ptr);} /** * nilfs_bmap_insert - insert a new key-record pair into a bmap * @bmap: bmap * @key: key * @rec: record * * Description: nilfs_bmap_insert() inserts the new key-record pair specified * by @key and @rec into @bmap. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EEXIST - A record associated with @key already exists. * * %-EIO - I/O error (including metadata corruption). * * %-ENOMEM - Insufficient memory available. */int nilfs_bmap_insert(struct nilfs_bmap *bmap, __u64 key, unsigned long rec){ int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_do_insert(bmap, key, rec); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key){ __u64 keys[NILFS_BMAP_LARGE_LOW + 1]; __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1]; int ret, n; if (bmap->b_ops->bop_check_delete != NULL) { ret = bmap->b_ops->bop_check_delete(bmap, key); if (ret > 0) { n = bmap->b_ops->bop_gather_data( bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1); if (n < 0) return n; ret = nilfs_direct_delete_and_convert( bmap, key, keys, ptrs, n); if (ret == 0) bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE; return ret; } else if (ret < 0) return ret; } return bmap->b_ops->bop_delete(bmap, key, false);} /** * nilfs_bmap_seek_key - seek a valid entry and return its key * @bmap: bmap struct * @start: start key number * @keyp: place to store valid key * * Description: nilfs_bmap_seek_key() seeks a valid key on @bmap * starting from @start, and stores it to @keyp if found. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (including metadata corruption). * * %-ENOENT - No valid entry was found. * * %-ENOMEM - Insufficient memory available. */int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp){ int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_seek_key(bmap, start, keyp); up_read(&bmap->b_sem); if (ret < 0) ret = nilfs_bmap_convert_error(bmap, __func__, ret); return ret;} int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp){ int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_last_key(bmap, keyp); up_read(&bmap->b_sem); if (ret < 0) ret = nilfs_bmap_convert_error(bmap, __func__, ret); return ret;} /** * nilfs_bmap_delete - delete a key-record pair from a bmap * @bmap: bmap * @key: key * * Description: nilfs_bmap_delete() deletes the key-record pair specified by * @key from @bmap. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (including metadata corruption). * * %-ENOENT - A record associated with @key does not exist. * * %-ENOMEM - Insufficient memory available. */int nilfs_bmap_delete(struct nilfs_bmap *bmap, __u64 key){ int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_do_delete(bmap, key); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, __u64 key){ __u64 lastkey; int ret; ret = bmap->b_ops->bop_last_key(bmap, &lastkey); if (ret < 0) { if (ret == -ENOENT) ret = 0; return ret; } while (key <= lastkey) { ret = nilfs_bmap_do_delete(bmap, lastkey); if (ret < 0) return ret; ret = bmap->b_ops->bop_last_key(bmap, &lastkey); if (ret < 0) { if (ret == -ENOENT) ret = 0; return ret; } } return 0;} /** * nilfs_bmap_truncate - truncate a bmap to a specified key * @bmap: bmap * @key: key * * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are * greater than or equal to @key from @bmap. * * 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. */int nilfs_bmap_truncate(struct nilfs_bmap *bmap, __u64 key){ int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_do_truncate(bmap, key); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} /** * nilfs_bmap_clear - free resources a bmap holds * @bmap: bmap * * Description: nilfs_bmap_clear() frees resources associated with @bmap. */void nilfs_bmap_clear(struct nilfs_bmap *bmap){ down_write(&bmap->b_sem); if (bmap->b_ops->bop_clear != NULL) bmap->b_ops->bop_clear(bmap); up_write(&bmap->b_sem);} /** * nilfs_bmap_propagate - propagate dirty state * @bmap: bmap * @bh: buffer head * * Description: nilfs_bmap_propagate() marks the buffers that directly or * indirectly refer to the block specified by @bh dirty. * * 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. */int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh){ int ret; down_write(&bmap->b_sem); ret = bmap->b_ops->bop_propagate(bmap, bh); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} /** * nilfs_bmap_lookup_dirty_buffers - collect dirty block buffers * @bmap: bmap * @listp: pointer to buffer head list */void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap, struct list_head *listp){ if (bmap->b_ops->bop_lookup_dirty_buffers != NULL) bmap->b_ops->bop_lookup_dirty_buffers(bmap, listp);} /** * nilfs_bmap_assign - assign a new block number to a block * @bmap: bmap * @bh: place to store a pointer to the buffer head to which a block * address is assigned (in/out) * @blocknr: block number * @binfo: block information * * Description: nilfs_bmap_assign() assigns the block number @blocknr to the * buffer specified by @bh. The block information is stored in the memory * pointed to by @binfo, and the buffer head may be replaced as a block * address is assigned, in which case a pointer to the new buffer head is * stored in the memory pointed to by @bh. * * 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. */int nilfs_bmap_assign(struct nilfs_bmap *bmap, struct buffer_head **bh, unsigned long blocknr, union nilfs_binfo *binfo){ int ret; down_write(&bmap->b_sem); ret = bmap->b_ops->bop_assign(bmap, bh, blocknr, binfo); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} /** * nilfs_bmap_mark - mark block dirty * @bmap: bmap * @key: key * @level: level * * Description: nilfs_bmap_mark() marks the block specified by @key and @level * as dirty. * * 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. */int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level){ int ret; if (bmap->b_ops->bop_mark == NULL) return 0; down_write(&bmap->b_sem); ret = bmap->b_ops->bop_mark(bmap, key, level); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret);} /** * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state * @bmap: bmap * * Description: nilfs_test_and_clear() is the atomic operation to test and * clear the dirty state of @bmap. * * Return: 1 if @bmap is dirty, or 0 if clear. */int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap){ int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_dirty(bmap); nilfs_bmap_clear_dirty(bmap); up_write(&bmap->b_sem); return ret;} /* * Internal use only */__u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap, const struct buffer_head *bh){ loff_t pos = folio_pos(bh->b_folio) + bh_offset(bh); return pos >> bmap->b_inode->i_blkbits;} __u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key){ __s64 diff; diff = key - bmap->b_last_allocated_key; if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) && (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) && (bmap->b_last_allocated_ptr + diff > 0)) return bmap->b_last_allocated_ptr + diff; else return NILFS_BMAP_INVALID_PTR;} #define NILFS_BMAP_GROUP_DIV 8 /* must be power of 2 */ __u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap){ struct inode *dat = nilfs_bmap_get_dat(bmap); unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat); unsigned long group; u32 index; BUILD_BUG_ON_NOT_POWER_OF_2(NILFS_BMAP_GROUP_DIV); group = div_u64(bmap->b_inode->i_ino, entries_per_group); index = bmap->b_inode->i_ino & (NILFS_BMAP_GROUP_DIV - 1); return group * entries_per_group + index * (entries_per_group / NILFS_BMAP_GROUP_DIV);} static struct lock_class_key nilfs_bmap_dat_lock_key;static struct lock_class_key nilfs_bmap_mdt_lock_key; /** * nilfs_bmap_read - read a bmap from an inode * @bmap: bmap * @raw_inode: on-disk inode * * Description: nilfs_bmap_read() initializes the bmap @bmap. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (corrupted bmap). * * %-ENOMEM - Insufficient memory available. */int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode){ if (raw_inode == NULL) memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE); else memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE); init_rwsem(&bmap->b_sem); bmap->b_state = 0; bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; switch (bmap->b_inode->i_ino) { case NILFS_DAT_INO: bmap->b_ptr_type = NILFS_BMAP_PTR_P; bmap->b_last_allocated_key = 0;Lines 1–500 of 568. 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// SPDX-License-Identifier: GPL-2.0+ /* * NILFS block mapping. * * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. * * Written by Koji Sato. */ #include <linux/fs.h> #include <linux/string.h> #include <linux/errno.h> #include "nilfs.h" #include "bmap.h" #include "btree.h" #include "direct.h" #include "btnode.h" #include "mdt.h" #include "dat.h" #include "alloc.h" struct inode *nilfs_bmap_get_dat(const struct nilfs_bmap *bmap) { struct the_nilfs *nilfs = bmap->b_inode->i_sb->s_fs_info; return nilfs->ns_dat; } static int nilfs_bmap_convert_error(struct nilfs_bmap *bmap, const char *fname, int err) { struct inode *inode = bmap->b_inode; if (err == -EINVAL) { __nilfs_error(inode->i_sb, fname, "broken bmap (inode number=%llu)", inode->i_ino); err = -EIO; } return err; } /** * nilfs_bmap_lookup_at_level - find a data block or node block * @bmap: bmap * @key: key * @level: level * @ptrp: place to store the value associated to @key * * Description: nilfs_bmap_lookup_at_level() finds a record whose key * matches @key in the block at @level of the bmap. The record associated * with @key is stored in the place pointed to by @ptrp. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (including metadata corruption). * * %-ENOENT - A record associated with @key does not exist. * * %-ENOMEM - Insufficient memory available. */ int nilfs_bmap_lookup_at_level(struct nilfs_bmap *bmap, __u64 key, int level, __u64 *ptrp) { sector_t blocknr; int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_lookup(bmap, key, level, ptrp); if (ret < 0) goto out; if (NILFS_BMAP_USE_VBN(bmap)) { ret = nilfs_dat_translate(nilfs_bmap_get_dat(bmap), *ptrp, &blocknr); if (!ret) *ptrp = blocknr; else if (ret == -ENOENT) { /* * If there was no valid entry in DAT for the block * address obtained by b_ops->bop_lookup, then pass * internal code -EINVAL to nilfs_bmap_convert_error * to treat it as metadata corruption. */ ret = -EINVAL; } } out: up_read(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } int nilfs_bmap_lookup_contig(struct nilfs_bmap *bmap, __u64 key, __u64 *ptrp, unsigned int maxblocks) { int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_lookup_contig(bmap, key, ptrp, maxblocks); up_read(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } static int nilfs_bmap_do_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr) { __u64 keys[NILFS_BMAP_SMALL_HIGH + 1]; __u64 ptrs[NILFS_BMAP_SMALL_HIGH + 1]; int ret, n; if (bmap->b_ops->bop_check_insert != NULL) { ret = bmap->b_ops->bop_check_insert(bmap, key); if (ret > 0) { n = bmap->b_ops->bop_gather_data( bmap, keys, ptrs, NILFS_BMAP_SMALL_HIGH + 1); if (n < 0) return n; ret = nilfs_btree_convert_and_insert( bmap, key, ptr, keys, ptrs, n); if (ret == 0) bmap->b_u.u_flags |= NILFS_BMAP_LARGE; return ret; } else if (ret < 0) return ret; } return bmap->b_ops->bop_insert(bmap, key, ptr); } /** * nilfs_bmap_insert - insert a new key-record pair into a bmap * @bmap: bmap * @key: key * @rec: record * * Description: nilfs_bmap_insert() inserts the new key-record pair specified * by @key and @rec into @bmap. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EEXIST - A record associated with @key already exists. * * %-EIO - I/O error (including metadata corruption). * * %-ENOMEM - Insufficient memory available. */ int nilfs_bmap_insert(struct nilfs_bmap *bmap, __u64 key, unsigned long rec) { int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_do_insert(bmap, key, rec); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } static int nilfs_bmap_do_delete(struct nilfs_bmap *bmap, __u64 key) { __u64 keys[NILFS_BMAP_LARGE_LOW + 1]; __u64 ptrs[NILFS_BMAP_LARGE_LOW + 1]; int ret, n; if (bmap->b_ops->bop_check_delete != NULL) { ret = bmap->b_ops->bop_check_delete(bmap, key); if (ret > 0) { n = bmap->b_ops->bop_gather_data( bmap, keys, ptrs, NILFS_BMAP_LARGE_LOW + 1); if (n < 0) return n; ret = nilfs_direct_delete_and_convert( bmap, key, keys, ptrs, n); if (ret == 0) bmap->b_u.u_flags &= ~NILFS_BMAP_LARGE; return ret; } else if (ret < 0) return ret; } return bmap->b_ops->bop_delete(bmap, key, false); } /** * nilfs_bmap_seek_key - seek a valid entry and return its key * @bmap: bmap struct * @start: start key number * @keyp: place to store valid key * * Description: nilfs_bmap_seek_key() seeks a valid key on @bmap * starting from @start, and stores it to @keyp if found. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (including metadata corruption). * * %-ENOENT - No valid entry was found. * * %-ENOMEM - Insufficient memory available. */ int nilfs_bmap_seek_key(struct nilfs_bmap *bmap, __u64 start, __u64 *keyp) { int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_seek_key(bmap, start, keyp); up_read(&bmap->b_sem); if (ret < 0) ret = nilfs_bmap_convert_error(bmap, __func__, ret); return ret; } int nilfs_bmap_last_key(struct nilfs_bmap *bmap, __u64 *keyp) { int ret; down_read(&bmap->b_sem); ret = bmap->b_ops->bop_last_key(bmap, keyp); up_read(&bmap->b_sem); if (ret < 0) ret = nilfs_bmap_convert_error(bmap, __func__, ret); return ret; } /** * nilfs_bmap_delete - delete a key-record pair from a bmap * @bmap: bmap * @key: key * * Description: nilfs_bmap_delete() deletes the key-record pair specified by * @key from @bmap. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (including metadata corruption). * * %-ENOENT - A record associated with @key does not exist. * * %-ENOMEM - Insufficient memory available. */ int nilfs_bmap_delete(struct nilfs_bmap *bmap, __u64 key) { int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_do_delete(bmap, key); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } static int nilfs_bmap_do_truncate(struct nilfs_bmap *bmap, __u64 key) { __u64 lastkey; int ret; ret = bmap->b_ops->bop_last_key(bmap, &lastkey); if (ret < 0) { if (ret == -ENOENT) ret = 0; return ret; } while (key <= lastkey) { ret = nilfs_bmap_do_delete(bmap, lastkey); if (ret < 0) return ret; ret = bmap->b_ops->bop_last_key(bmap, &lastkey); if (ret < 0) { if (ret == -ENOENT) ret = 0; return ret; } } return 0; } /** * nilfs_bmap_truncate - truncate a bmap to a specified key * @bmap: bmap * @key: key * * Description: nilfs_bmap_truncate() removes key-record pairs whose keys are * greater than or equal to @key from @bmap. * * 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. */ int nilfs_bmap_truncate(struct nilfs_bmap *bmap, __u64 key) { int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_do_truncate(bmap, key); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } /** * nilfs_bmap_clear - free resources a bmap holds * @bmap: bmap * * Description: nilfs_bmap_clear() frees resources associated with @bmap. */ void nilfs_bmap_clear(struct nilfs_bmap *bmap) { down_write(&bmap->b_sem); if (bmap->b_ops->bop_clear != NULL) bmap->b_ops->bop_clear(bmap); up_write(&bmap->b_sem); } /** * nilfs_bmap_propagate - propagate dirty state * @bmap: bmap * @bh: buffer head * * Description: nilfs_bmap_propagate() marks the buffers that directly or * indirectly refer to the block specified by @bh dirty. * * 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. */ int nilfs_bmap_propagate(struct nilfs_bmap *bmap, struct buffer_head *bh) { int ret; down_write(&bmap->b_sem); ret = bmap->b_ops->bop_propagate(bmap, bh); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } /** * nilfs_bmap_lookup_dirty_buffers - collect dirty block buffers * @bmap: bmap * @listp: pointer to buffer head list */ void nilfs_bmap_lookup_dirty_buffers(struct nilfs_bmap *bmap, struct list_head *listp) { if (bmap->b_ops->bop_lookup_dirty_buffers != NULL) bmap->b_ops->bop_lookup_dirty_buffers(bmap, listp); } /** * nilfs_bmap_assign - assign a new block number to a block * @bmap: bmap * @bh: place to store a pointer to the buffer head to which a block * address is assigned (in/out) * @blocknr: block number * @binfo: block information * * Description: nilfs_bmap_assign() assigns the block number @blocknr to the * buffer specified by @bh. The block information is stored in the memory * pointed to by @binfo, and the buffer head may be replaced as a block * address is assigned, in which case a pointer to the new buffer head is * stored in the memory pointed to by @bh. * * 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. */ int nilfs_bmap_assign(struct nilfs_bmap *bmap, struct buffer_head **bh, unsigned long blocknr, union nilfs_binfo *binfo) { int ret; down_write(&bmap->b_sem); ret = bmap->b_ops->bop_assign(bmap, bh, blocknr, binfo); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } /** * nilfs_bmap_mark - mark block dirty * @bmap: bmap * @key: key * @level: level * * Description: nilfs_bmap_mark() marks the block specified by @key and @level * as dirty. * * 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. */ int nilfs_bmap_mark(struct nilfs_bmap *bmap, __u64 key, int level) { int ret; if (bmap->b_ops->bop_mark == NULL) return 0; down_write(&bmap->b_sem); ret = bmap->b_ops->bop_mark(bmap, key, level); up_write(&bmap->b_sem); return nilfs_bmap_convert_error(bmap, __func__, ret); } /** * nilfs_bmap_test_and_clear_dirty - test and clear a bmap dirty state * @bmap: bmap * * Description: nilfs_test_and_clear() is the atomic operation to test and * clear the dirty state of @bmap. * * Return: 1 if @bmap is dirty, or 0 if clear. */ int nilfs_bmap_test_and_clear_dirty(struct nilfs_bmap *bmap) { int ret; down_write(&bmap->b_sem); ret = nilfs_bmap_dirty(bmap); nilfs_bmap_clear_dirty(bmap); up_write(&bmap->b_sem); return ret; } /* * Internal use only */ __u64 nilfs_bmap_data_get_key(const struct nilfs_bmap *bmap, const struct buffer_head *bh) { loff_t pos = folio_pos(bh->b_folio) + bh_offset(bh); return pos >> bmap->b_inode->i_blkbits; } __u64 nilfs_bmap_find_target_seq(const struct nilfs_bmap *bmap, __u64 key) { __s64 diff; diff = key - bmap->b_last_allocated_key; if ((nilfs_bmap_keydiff_abs(diff) < NILFS_INODE_BMAP_SIZE) && (bmap->b_last_allocated_ptr != NILFS_BMAP_INVALID_PTR) && (bmap->b_last_allocated_ptr + diff > 0)) return bmap->b_last_allocated_ptr + diff; else return NILFS_BMAP_INVALID_PTR; } #define NILFS_BMAP_GROUP_DIV 8 /* must be power of 2 */ __u64 nilfs_bmap_find_target_in_group(const struct nilfs_bmap *bmap) { struct inode *dat = nilfs_bmap_get_dat(bmap); unsigned long entries_per_group = nilfs_palloc_entries_per_group(dat); unsigned long group; u32 index; BUILD_BUG_ON_NOT_POWER_OF_2(NILFS_BMAP_GROUP_DIV); group = div_u64(bmap->b_inode->i_ino, entries_per_group); index = bmap->b_inode->i_ino & (NILFS_BMAP_GROUP_DIV - 1); return group * entries_per_group + index * (entries_per_group / NILFS_BMAP_GROUP_DIV); } static struct lock_class_key nilfs_bmap_dat_lock_key; static struct lock_class_key nilfs_bmap_mdt_lock_key; /** * nilfs_bmap_read - read a bmap from an inode * @bmap: bmap * @raw_inode: on-disk inode * * Description: nilfs_bmap_read() initializes the bmap @bmap. * * Return: 0 on success, or one of the following negative error codes on * failure: * * %-EIO - I/O error (corrupted bmap). * * %-ENOMEM - Insufficient memory available. */ int nilfs_bmap_read(struct nilfs_bmap *bmap, struct nilfs_inode *raw_inode) { if (raw_inode == NULL) memset(bmap->b_u.u_data, 0, NILFS_BMAP_SIZE); else memcpy(bmap->b_u.u_data, raw_inode->i_bmap, NILFS_BMAP_SIZE); init_rwsem(&bmap->b_sem); bmap->b_state = 0; bmap->b_inode = &NILFS_BMAP_I(bmap)->vfs_inode; switch (bmap->b_inode->i_ino) { case NILFS_DAT_INO: bmap->b_ptr_type = NILFS_BMAP_PTR_P; bmap->b_last_allocated_key = 0;