diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c index c2486598fb87..4ee008c6d64b 100644 --- a/fs/gfs2/dir.c +++ b/fs/gfs2/dir.c @@ -443,6 +443,27 @@ static int gfs2_dirent_last(const struct gfs2_dirent *dent, return 0; } +/* Look for the dirent that contains the offset specified in data. Once we + * find that dirent, there must be space available there for the new dirent */ +static int gfs2_dirent_find_offset(const struct gfs2_dirent *dent, + const struct qstr *name, + void *ptr) +{ + unsigned required = GFS2_DIRENT_SIZE(name->len); + unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); + unsigned totlen = be16_to_cpu(dent->de_rec_len); + + if (ptr < (void *)dent || ptr >= (void *)dent + totlen) + return 0; + if (gfs2_dirent_sentinel(dent)) + actual = 0; + if (ptr < (void *)dent + actual) + return -1; + if ((void *)dent + totlen >= ptr + required) + return 1; + return -1; +} + static int gfs2_dirent_find_space(const struct gfs2_dirent *dent, const struct qstr *name, void *opaque) @@ -682,21 +703,17 @@ static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh, prev->de_rec_len = cpu_to_be16(prev_rec_len); } -/* - * Takes a dent from which to grab space as an argument. Returns the - * newly created dent. - */ -static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode, - struct gfs2_dirent *dent, - const struct qstr *name, - struct buffer_head *bh) + +static struct gfs2_dirent *do_init_dirent(struct inode *inode, + struct gfs2_dirent *dent, + const struct qstr *name, + struct buffer_head *bh, + unsigned offset) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_dirent *ndent; - unsigned offset = 0, totlen; + unsigned totlen; - if (!gfs2_dirent_sentinel(dent)) - offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); totlen = be16_to_cpu(dent->de_rec_len); BUG_ON(offset + name->len > totlen); gfs2_trans_add_meta(ip->i_gl, bh); @@ -706,16 +723,35 @@ static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode, return ndent; } -static struct gfs2_dirent *gfs2_dirent_alloc(struct inode *inode, - struct buffer_head *bh, - const struct qstr *name) + +/* + * Takes a dent from which to grab space as an argument. Returns the + * newly created dent. + */ +static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode, + struct gfs2_dirent *dent, + const struct qstr *name, + struct buffer_head *bh) +{ + unsigned offset = 0; + + if (!gfs2_dirent_sentinel(dent)) + offset = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); + return do_init_dirent(inode, dent, name, bh, offset); +} + +static struct gfs2_dirent *gfs2_dirent_split_alloc(struct inode *inode, + struct buffer_head *bh, + const struct qstr *name, + void *ptr) { struct gfs2_dirent *dent; dent = gfs2_dirent_scan(inode, bh->b_data, bh->b_size, - gfs2_dirent_find_space, name, NULL); + gfs2_dirent_find_offset, name, ptr); if (!dent || IS_ERR(dent)) return dent; - return gfs2_init_dirent(inode, dent, name, bh); + return do_init_dirent(inode, dent, name, bh, + (unsigned)(ptr - (void *)dent)); } static int get_leaf(struct gfs2_inode *dip, u64 leaf_no, @@ -1051,10 +1087,11 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name) if (!gfs2_dirent_sentinel(dent) && be32_to_cpu(dent->de_hash) < divider) { struct qstr str; + void *ptr = ((char *)dent - obh->b_data) + nbh->b_data; str.name = (char*)(dent+1); str.len = be16_to_cpu(dent->de_name_len); str.hash = be32_to_cpu(dent->de_hash); - new = gfs2_dirent_alloc(inode, nbh, &str); + new = gfs2_dirent_split_alloc(inode, nbh, &str, ptr); if (IS_ERR(new)) { error = PTR_ERR(new); break;