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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /fs/nilfs2/direct.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'fs/nilfs2/direct.c')
-rw-r--r-- | fs/nilfs2/direct.c | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/fs/nilfs2/direct.c b/fs/nilfs2/direct.c new file mode 100644 index 000000000..a35f2795b --- /dev/null +++ b/fs/nilfs2/direct.c @@ -0,0 +1,378 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * NILFS direct block pointer. + * + * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. + * + * Written by Koji Sato. + */ + +#include <linux/errno.h> +#include "nilfs.h" +#include "page.h" +#include "direct.h" +#include "alloc.h" +#include "dat.h" + +static inline __le64 *nilfs_direct_dptrs(const struct nilfs_bmap *direct) +{ + return (__le64 *) + ((struct nilfs_direct_node *)direct->b_u.u_data + 1); +} + +static inline __u64 +nilfs_direct_get_ptr(const struct nilfs_bmap *direct, __u64 key) +{ + return le64_to_cpu(*(nilfs_direct_dptrs(direct) + key)); +} + +static inline void nilfs_direct_set_ptr(struct nilfs_bmap *direct, + __u64 key, __u64 ptr) +{ + *(nilfs_direct_dptrs(direct) + key) = cpu_to_le64(ptr); +} + +static int nilfs_direct_lookup(const struct nilfs_bmap *direct, + __u64 key, int level, __u64 *ptrp) +{ + __u64 ptr; + + if (key > NILFS_DIRECT_KEY_MAX || level != 1) + return -ENOENT; + ptr = nilfs_direct_get_ptr(direct, key); + if (ptr == NILFS_BMAP_INVALID_PTR) + return -ENOENT; + + *ptrp = ptr; + return 0; +} + +static int nilfs_direct_lookup_contig(const struct nilfs_bmap *direct, + __u64 key, __u64 *ptrp, + unsigned int maxblocks) +{ + struct inode *dat = NULL; + __u64 ptr, ptr2; + sector_t blocknr; + int ret, cnt; + + if (key > NILFS_DIRECT_KEY_MAX) + return -ENOENT; + ptr = nilfs_direct_get_ptr(direct, key); + if (ptr == NILFS_BMAP_INVALID_PTR) + return -ENOENT; + + if (NILFS_BMAP_USE_VBN(direct)) { + dat = nilfs_bmap_get_dat(direct); + ret = nilfs_dat_translate(dat, ptr, &blocknr); + if (ret < 0) + return ret; + ptr = blocknr; + } + + maxblocks = min_t(unsigned int, maxblocks, + NILFS_DIRECT_KEY_MAX - key + 1); + for (cnt = 1; cnt < maxblocks && + (ptr2 = nilfs_direct_get_ptr(direct, key + cnt)) != + NILFS_BMAP_INVALID_PTR; + cnt++) { + if (dat) { + ret = nilfs_dat_translate(dat, ptr2, &blocknr); + if (ret < 0) + return ret; + ptr2 = blocknr; + } + if (ptr2 != ptr + cnt) + break; + } + *ptrp = ptr; + return cnt; +} + +static __u64 +nilfs_direct_find_target_v(const struct nilfs_bmap *direct, __u64 key) +{ + __u64 ptr; + + ptr = nilfs_bmap_find_target_seq(direct, key); + if (ptr != NILFS_BMAP_INVALID_PTR) + /* sequential access */ + return ptr; + + /* block group */ + return nilfs_bmap_find_target_in_group(direct); +} + +static int nilfs_direct_insert(struct nilfs_bmap *bmap, __u64 key, __u64 ptr) +{ + union nilfs_bmap_ptr_req req; + struct inode *dat = NULL; + struct buffer_head *bh; + int ret; + + if (key > NILFS_DIRECT_KEY_MAX) + return -ENOENT; + if (nilfs_direct_get_ptr(bmap, key) != NILFS_BMAP_INVALID_PTR) + return -EEXIST; + + if (NILFS_BMAP_USE_VBN(bmap)) { + req.bpr_ptr = nilfs_direct_find_target_v(bmap, key); + dat = nilfs_bmap_get_dat(bmap); + } + ret = nilfs_bmap_prepare_alloc_ptr(bmap, &req, dat); + if (!ret) { + /* ptr must be a pointer to a buffer head. */ + bh = (struct buffer_head *)((unsigned long)ptr); + set_buffer_nilfs_volatile(bh); + + nilfs_bmap_commit_alloc_ptr(bmap, &req, dat); + nilfs_direct_set_ptr(bmap, key, req.bpr_ptr); + + if (!nilfs_bmap_dirty(bmap)) + nilfs_bmap_set_dirty(bmap); + + if (NILFS_BMAP_USE_VBN(bmap)) + nilfs_bmap_set_target_v(bmap, key, req.bpr_ptr); + + nilfs_inode_add_blocks(bmap->b_inode, 1); + } + return ret; +} + +static int nilfs_direct_delete(struct nilfs_bmap *bmap, __u64 key) +{ + union nilfs_bmap_ptr_req req; + struct inode *dat; + int ret; + + if (key > NILFS_DIRECT_KEY_MAX || + nilfs_direct_get_ptr(bmap, key) == NILFS_BMAP_INVALID_PTR) + return -ENOENT; + + dat = NILFS_BMAP_USE_VBN(bmap) ? nilfs_bmap_get_dat(bmap) : NULL; + req.bpr_ptr = nilfs_direct_get_ptr(bmap, key); + + ret = nilfs_bmap_prepare_end_ptr(bmap, &req, dat); + if (!ret) { + nilfs_bmap_commit_end_ptr(bmap, &req, dat); + nilfs_direct_set_ptr(bmap, key, NILFS_BMAP_INVALID_PTR); + nilfs_inode_sub_blocks(bmap->b_inode, 1); + } + return ret; +} + +static int nilfs_direct_seek_key(const struct nilfs_bmap *direct, __u64 start, + __u64 *keyp) +{ + __u64 key; + + for (key = start; key <= NILFS_DIRECT_KEY_MAX; key++) { + if (nilfs_direct_get_ptr(direct, key) != + NILFS_BMAP_INVALID_PTR) { + *keyp = key; + return 0; + } + } + return -ENOENT; +} + +static int nilfs_direct_last_key(const struct nilfs_bmap *direct, __u64 *keyp) +{ + __u64 key, lastkey; + + lastkey = NILFS_DIRECT_KEY_MAX + 1; + for (key = NILFS_DIRECT_KEY_MIN; key <= NILFS_DIRECT_KEY_MAX; key++) + if (nilfs_direct_get_ptr(direct, key) != + NILFS_BMAP_INVALID_PTR) + lastkey = key; + + if (lastkey == NILFS_DIRECT_KEY_MAX + 1) + return -ENOENT; + + *keyp = lastkey; + + return 0; +} + +static int nilfs_direct_check_insert(const struct nilfs_bmap *bmap, __u64 key) +{ + return key > NILFS_DIRECT_KEY_MAX; +} + +static int nilfs_direct_gather_data(struct nilfs_bmap *direct, + __u64 *keys, __u64 *ptrs, int nitems) +{ + __u64 key; + __u64 ptr; + int n; + + if (nitems > NILFS_DIRECT_NBLOCKS) + nitems = NILFS_DIRECT_NBLOCKS; + n = 0; + for (key = 0; key < nitems; key++) { + ptr = nilfs_direct_get_ptr(direct, key); + if (ptr != NILFS_BMAP_INVALID_PTR) { + keys[n] = key; + ptrs[n] = ptr; + n++; + } + } + return n; +} + +int nilfs_direct_delete_and_convert(struct nilfs_bmap *bmap, + __u64 key, __u64 *keys, __u64 *ptrs, int n) +{ + __le64 *dptrs; + int ret, i, j; + + /* no need to allocate any resource for conversion */ + + /* delete */ + ret = bmap->b_ops->bop_delete(bmap, key); + if (ret < 0) + return ret; + + /* free resources */ + if (bmap->b_ops->bop_clear != NULL) + bmap->b_ops->bop_clear(bmap); + + /* convert */ + dptrs = nilfs_direct_dptrs(bmap); + for (i = 0, j = 0; i < NILFS_DIRECT_NBLOCKS; i++) { + if ((j < n) && (i == keys[j])) { + dptrs[i] = (i != key) ? + cpu_to_le64(ptrs[j]) : + NILFS_BMAP_INVALID_PTR; + j++; + } else + dptrs[i] = NILFS_BMAP_INVALID_PTR; + } + + nilfs_direct_init(bmap); + return 0; +} + +static int nilfs_direct_propagate(struct nilfs_bmap *bmap, + struct buffer_head *bh) +{ + struct nilfs_palloc_req oldreq, newreq; + struct inode *dat; + __u64 key; + __u64 ptr; + int ret; + + if (!NILFS_BMAP_USE_VBN(bmap)) + return 0; + + dat = nilfs_bmap_get_dat(bmap); + key = nilfs_bmap_data_get_key(bmap, bh); + ptr = nilfs_direct_get_ptr(bmap, key); + if (!buffer_nilfs_volatile(bh)) { + oldreq.pr_entry_nr = ptr; + newreq.pr_entry_nr = ptr; + ret = nilfs_dat_prepare_update(dat, &oldreq, &newreq); + if (ret < 0) + return ret; + nilfs_dat_commit_update(dat, &oldreq, &newreq, + bmap->b_ptr_type == NILFS_BMAP_PTR_VS); + set_buffer_nilfs_volatile(bh); + nilfs_direct_set_ptr(bmap, key, newreq.pr_entry_nr); + } else + ret = nilfs_dat_mark_dirty(dat, ptr); + + return ret; +} + +static int nilfs_direct_assign_v(struct nilfs_bmap *direct, + __u64 key, __u64 ptr, + struct buffer_head **bh, + sector_t blocknr, + union nilfs_binfo *binfo) +{ + struct inode *dat = nilfs_bmap_get_dat(direct); + union nilfs_bmap_ptr_req req; + int ret; + + req.bpr_ptr = ptr; + ret = nilfs_dat_prepare_start(dat, &req.bpr_req); + if (!ret) { + nilfs_dat_commit_start(dat, &req.bpr_req, blocknr); + binfo->bi_v.bi_vblocknr = cpu_to_le64(ptr); + binfo->bi_v.bi_blkoff = cpu_to_le64(key); + } + return ret; +} + +static int nilfs_direct_assign_p(struct nilfs_bmap *direct, + __u64 key, __u64 ptr, + struct buffer_head **bh, + sector_t blocknr, + union nilfs_binfo *binfo) +{ + nilfs_direct_set_ptr(direct, key, blocknr); + + binfo->bi_dat.bi_blkoff = cpu_to_le64(key); + binfo->bi_dat.bi_level = 0; + + return 0; +} + +static int nilfs_direct_assign(struct nilfs_bmap *bmap, + struct buffer_head **bh, + sector_t blocknr, + union nilfs_binfo *binfo) +{ + __u64 key; + __u64 ptr; + + key = nilfs_bmap_data_get_key(bmap, *bh); + if (unlikely(key > NILFS_DIRECT_KEY_MAX)) { + nilfs_crit(bmap->b_inode->i_sb, + "%s (ino=%lu): invalid key: %llu", + __func__, + bmap->b_inode->i_ino, (unsigned long long)key); + return -EINVAL; + } + ptr = nilfs_direct_get_ptr(bmap, key); + if (unlikely(ptr == NILFS_BMAP_INVALID_PTR)) { + nilfs_crit(bmap->b_inode->i_sb, + "%s (ino=%lu): invalid pointer: %llu", + __func__, + bmap->b_inode->i_ino, (unsigned long long)ptr); + return -EINVAL; + } + + return NILFS_BMAP_USE_VBN(bmap) ? + nilfs_direct_assign_v(bmap, key, ptr, bh, blocknr, binfo) : + nilfs_direct_assign_p(bmap, key, ptr, bh, blocknr, binfo); +} + +static const struct nilfs_bmap_operations nilfs_direct_ops = { + .bop_lookup = nilfs_direct_lookup, + .bop_lookup_contig = nilfs_direct_lookup_contig, + .bop_insert = nilfs_direct_insert, + .bop_delete = nilfs_direct_delete, + .bop_clear = NULL, + + .bop_propagate = nilfs_direct_propagate, + + .bop_lookup_dirty_buffers = NULL, + + .bop_assign = nilfs_direct_assign, + .bop_mark = NULL, + + .bop_seek_key = nilfs_direct_seek_key, + .bop_last_key = nilfs_direct_last_key, + + .bop_check_insert = nilfs_direct_check_insert, + .bop_check_delete = NULL, + .bop_gather_data = nilfs_direct_gather_data, +}; + + +int nilfs_direct_init(struct nilfs_bmap *bmap) +{ + bmap->b_ops = &nilfs_direct_ops; + return 0; +} |