From 5e7d65cd9d3819512b059f4260de0119b985454c Mon Sep 17 00:00:00 2001 From: Steven Whitehouse Date: Fri, 17 Nov 2006 12:27:44 -0500 Subject: [PATCH] [GFS2] Make sentinel dirents compatible with gfs1 When deleting directory entries, we set the inum.no_addr to zero in a dirent when its the first dirent in a block and thus cannot be merged into the previous dirent as is the usual case. In gfs1, inum.no_formal_ino was used instead. This patch changes gfs2 to set both inum.no_addr and inum.no_formal_ino to zero. It also changes the test from just looking at inum.no_addr to look at both inum.no_addr and inum.no_formal_ino and a sentinel is now considered to be a dirent in which _either_ (or both) of them is set to zero. This resolves Red Hat bugzillas: #215809, #211465 Signed-off-by: Steven Whitehouse --- fs/gfs2/dir.c | 26 ++++++++++++++++---------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c index a2923fb91bb..0fdcb7713cd 100644 --- a/fs/gfs2/dir.c +++ b/fs/gfs2/dir.c @@ -340,10 +340,15 @@ fail: return (copied) ? copied : error; } +static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent) +{ + return dent->de_inum.no_addr == 0 || dent->de_inum.no_formal_ino == 0; +} + static inline int __gfs2_dirent_find(const struct gfs2_dirent *dent, const struct qstr *name, int ret) { - if (dent->de_inum.no_addr != 0 && + if (!gfs2_dirent_sentinel(dent) && be32_to_cpu(dent->de_hash) == name->hash && be16_to_cpu(dent->de_name_len) == name->len && memcmp(dent+1, name->name, name->len) == 0) @@ -388,7 +393,7 @@ static int gfs2_dirent_find_space(const struct gfs2_dirent *dent, unsigned actual = GFS2_DIRENT_SIZE(be16_to_cpu(dent->de_name_len)); unsigned totlen = be16_to_cpu(dent->de_rec_len); - if (!dent->de_inum.no_addr) + if (gfs2_dirent_sentinel(dent)) actual = GFS2_DIRENT_SIZE(0); if (totlen - actual >= required) return 1; @@ -405,7 +410,7 @@ static int gfs2_dirent_gather(const struct gfs2_dirent *dent, void *opaque) { struct dirent_gather *g = opaque; - if (dent->de_inum.no_addr) { + if (!gfs2_dirent_sentinel(dent)) { g->pdent[g->offset++] = dent; } return 0; @@ -433,10 +438,10 @@ static int gfs2_check_dirent(struct gfs2_dirent *dent, unsigned int offset, if (unlikely(offset + size > len)) goto error; msg = "zero inode number"; - if (unlikely(!first && !dent->de_inum.no_addr)) + if (unlikely(!first && gfs2_dirent_sentinel(dent))) goto error; msg = "name length is greater than space in dirent"; - if (dent->de_inum.no_addr && + if (!gfs2_dirent_sentinel(dent) && unlikely(sizeof(struct gfs2_dirent)+be16_to_cpu(dent->de_name_len) > size)) goto error; @@ -598,7 +603,7 @@ static int dirent_next(struct gfs2_inode *dip, struct buffer_head *bh, return ret; /* Only the first dent could ever have de_inum.no_addr == 0 */ - if (!tmp->de_inum.no_addr) { + if (gfs2_dirent_sentinel(tmp)) { gfs2_consist_inode(dip); return -EIO; } @@ -621,7 +626,7 @@ static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh, { u16 cur_rec_len, prev_rec_len; - if (!cur->de_inum.no_addr) { + if (gfs2_dirent_sentinel(cur)) { gfs2_consist_inode(dip); return; } @@ -633,7 +638,8 @@ static void dirent_del(struct gfs2_inode *dip, struct buffer_head *bh, out the inode number and return. */ if (!prev) { - cur->de_inum.no_addr = 0; /* No endianess worries */ + cur->de_inum.no_addr = 0; + cur->de_inum.no_formal_ino = 0; return; } @@ -664,7 +670,7 @@ static struct gfs2_dirent *gfs2_init_dirent(struct inode *inode, struct gfs2_dirent *ndent; unsigned offset = 0, totlen; - if (dent->de_inum.no_addr) + 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); @@ -1002,7 +1008,7 @@ static int dir_split_leaf(struct inode *inode, const struct qstr *name) if (dirent_next(dip, obh, &next)) next = NULL; - if (dent->de_inum.no_addr && + if (!gfs2_dirent_sentinel(dent) && be32_to_cpu(dent->de_hash) < divider) { struct qstr str; str.name = (char*)(dent+1); -- 2.41.1