diff options
Diffstat (limited to 'fs/ubifs/lpt.c')
| -rw-r--r-- | fs/ubifs/lpt.c | 45 |
1 files changed, 21 insertions, 24 deletions
diff --git a/fs/ubifs/lpt.c b/fs/ubifs/lpt.c index db8bd0e..b2792e8 100644 --- a/fs/ubifs/lpt.c +++ b/fs/ubifs/lpt.c @@ -36,15 +36,16 @@ * can be written into a single eraseblock. In that case, garbage collection * consists of just writing the whole table, which therefore makes all other * eraseblocks reusable. In the case of the big model, dirty eraseblocks are - * selected for garbage collection, which consists are marking the nodes in + * selected for garbage collection, which consists of marking the clean nodes in * that LEB as dirty, and then only the dirty nodes are written out. Also, in * the case of the big model, a table of LEB numbers is saved so that the entire * LPT does not to be scanned looking for empty eraseblocks when UBIFS is first * mounted. */ -#include <linux/crc16.h> #include "ubifs.h" +#include <linux/crc16.h> +#include <linux/math64.h> /** * do_calc_lpt_geom - calculate sizes for the LPT area. @@ -135,15 +136,13 @@ static void do_calc_lpt_geom(struct ubifs_info *c) int ubifs_calc_lpt_geom(struct ubifs_info *c) { int lebs_needed; - uint64_t sz; + long long sz; do_calc_lpt_geom(c); /* Verify that lpt_lebs is big enough */ sz = c->lpt_sz * 2; /* Must have at least 2 times the size */ - sz += c->leb_size - 1; - do_div(sz, c->leb_size); - lebs_needed = sz; + lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size); if (lebs_needed > c->lpt_lebs) { ubifs_err("too few LPT LEBs"); return -EINVAL; @@ -156,7 +155,6 @@ int ubifs_calc_lpt_geom(struct ubifs_info *c) } c->check_lpt_free = c->big_lpt; - return 0; } @@ -176,7 +174,7 @@ static int calc_dflt_lpt_geom(struct ubifs_info *c, int *main_lebs, int *big_lpt) { int i, lebs_needed; - uint64_t sz; + long long sz; /* Start by assuming the minimum number of LPT LEBs */ c->lpt_lebs = UBIFS_MIN_LPT_LEBS; @@ -203,9 +201,7 @@ static int calc_dflt_lpt_geom(struct ubifs_info *c, int *main_lebs, /* Now check there are enough LPT LEBs */ for (i = 0; i < 64 ; i++) { sz = c->lpt_sz * 4; /* Allow 4 times the size */ - sz += c->leb_size - 1; - do_div(sz, c->leb_size); - lebs_needed = sz; + lebs_needed = div_u64(sz + c->leb_size - 1, c->leb_size); if (lebs_needed > c->lpt_lebs) { /* Not enough LPT LEBs so try again with more */ c->lpt_lebs = lebs_needed; @@ -558,7 +554,7 @@ static int calc_nnode_num(int row, int col) * This function calculates and returns the nnode number based on the parent's * nnode number and the index in parent. */ -static int calc_nnode_num_from_parent(struct ubifs_info *c, +static int calc_nnode_num_from_parent(const struct ubifs_info *c, struct ubifs_nnode *parent, int iip) { int num, shft; @@ -583,7 +579,7 @@ static int calc_nnode_num_from_parent(struct ubifs_info *c, * This function calculates and returns the pnode number based on the parent's * nnode number and the index in parent. */ -static int calc_pnode_num_from_parent(struct ubifs_info *c, +static int calc_pnode_num_from_parent(const struct ubifs_info *c, struct ubifs_nnode *parent, int iip) { int i, n = c->lpt_hght - 1, pnum = parent->num, num = 0; @@ -966,7 +962,7 @@ static int check_lpt_type(uint8_t **addr, int *pos, int type) * * This function returns %0 on success and a negative error code on failure. */ -static int unpack_pnode(struct ubifs_info *c, void *buf, +static int unpack_pnode(const struct ubifs_info *c, void *buf, struct ubifs_pnode *pnode) { uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; @@ -996,15 +992,15 @@ static int unpack_pnode(struct ubifs_info *c, void *buf, } /** - * unpack_nnode - unpack a nnode. + * ubifs_unpack_nnode - unpack a nnode. * @c: UBIFS file-system description object * @buf: buffer containing packed nnode to unpack * @nnode: nnode structure to fill * * This function returns %0 on success and a negative error code on failure. */ -static int unpack_nnode(struct ubifs_info *c, void *buf, - struct ubifs_nnode *nnode) +int ubifs_unpack_nnode(const struct ubifs_info *c, void *buf, + struct ubifs_nnode *nnode) { uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; int i, pos = 0, err; @@ -1036,7 +1032,7 @@ static int unpack_nnode(struct ubifs_info *c, void *buf, * * This function returns %0 on success and a negative error code on failure. */ -static int unpack_ltab(struct ubifs_info *c, void *buf) +static int unpack_ltab(const struct ubifs_info *c, void *buf) { uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; int i, pos = 0, err; @@ -1068,7 +1064,7 @@ static int unpack_ltab(struct ubifs_info *c, void *buf) * * This function returns %0 on success and a negative error code on failure. */ -static int unpack_lsave(struct ubifs_info *c, void *buf) +static int unpack_lsave(const struct ubifs_info *c, void *buf) { uint8_t *addr = buf + UBIFS_LPT_CRC_BYTES; int i, pos = 0, err; @@ -1096,7 +1092,7 @@ static int unpack_lsave(struct ubifs_info *c, void *buf) * * This function returns %0 on success and a negative error code on failure. */ -static int validate_nnode(struct ubifs_info *c, struct ubifs_nnode *nnode, +static int validate_nnode(const struct ubifs_info *c, struct ubifs_nnode *nnode, struct ubifs_nnode *parent, int iip) { int i, lvl, max_offs; @@ -1140,7 +1136,7 @@ static int validate_nnode(struct ubifs_info *c, struct ubifs_nnode *nnode, * * This function returns %0 on success and a negative error code on failure. */ -static int validate_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode, +static int validate_pnode(const struct ubifs_info *c, struct ubifs_pnode *pnode, struct ubifs_nnode *parent, int iip) { int i; @@ -1174,7 +1170,8 @@ static int validate_pnode(struct ubifs_info *c, struct ubifs_pnode *pnode, * This function calculates the LEB numbers for the LEB properties it contains * based on the pnode number. */ -static void set_pnode_lnum(struct ubifs_info *c, struct ubifs_pnode *pnode) +static void set_pnode_lnum(const struct ubifs_info *c, + struct ubifs_pnode *pnode) { int i, lnum; @@ -1227,7 +1224,7 @@ int ubifs_read_nnode(struct ubifs_info *c, struct ubifs_nnode *parent, int iip) err = ubi_read(c->ubi, lnum, buf, offs, c->nnode_sz); if (err) goto out; - err = unpack_nnode(c, buf, nnode); + err = ubifs_unpack_nnode(c, buf, nnode); if (err) goto out; } @@ -1816,7 +1813,7 @@ static struct ubifs_nnode *scan_get_nnode(struct ubifs_info *c, c->nnode_sz); if (err) return ERR_PTR(err); - err = unpack_nnode(c, buf, nnode); + err = ubifs_unpack_nnode(c, buf, nnode); if (err) return ERR_PTR(err); } |
