From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <1423826881.5969.33.camel@infradead.org> Subject: Re: [PATCH]jffs2:bugfix for should not appeared directory hard link From: David Woodhouse To: liu.song11@zte.com.cn Date: Fri, 13 Feb 2015 11:28:01 +0000 In-Reply-To: <1423822421.5969.11.camel@infradead.org> References: <1423748599.15180.10.camel@infradead.org> <1423822421.5969.11.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-wqNEMhNnSFARD3/SHy6f" Mime-Version: 1.0 Cc: jiang.xuexin@zte.com.cn, wang.bo116@zte.com.cn, linux-mtd@lists.infradead.org, deng.chao1@zte.com.cn, cui.yunfeng@zte.com.cn List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , --=-wqNEMhNnSFARD3/SHy6f Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-02-13 at 10:13 +0000, David Woodhouse wrote: >=20 > If is somehow ending up linked as /mnt/foo again when it should > have been unlinked, *that* is the problem we need to be looking at. The > zombie *children* of are just a symptom of its reincarnation. Ah, I think I understand a little better. At the time the problem happens, it's too *early* in the scan/build process. We don't yet *know* that ino#71 is dead, because we haven't yet scanned the whole flash looking for dirents that might point to it. In the problematic case, the directory SW1<#2> is first discovered when we see its dirent from the *dead* directory <#71>, and we fill in ic<2>->pino_nlink =3D 71. And then *later* we find the *real* dirent which links SW1<#2> from the root directory, and we hit that 'appears to be a hard link' message in jffs2_build_inode_pass1(). The problem really comes when we *later* kill ino#71 because we realise it doesn't have any valid dirents keeping it alive, and we *also* kill all its children. Some of which weren't *really* supposed to be its children :) If we happened to hit the real dirent for SW1<#2> *first*, and the dirent linking it from <#71> *later*, then we'd be OK. This is all because of the NFS export support, which means we have to know the parent inode# for directories. If we were still storing nlink for directories as we do for plain files, we could fix this fairly easily. Your approach is to fix the garbage collection, to ensure that the old deletion dirents "unlinking" SW1<#2> from the dead aren't actually allowed to expire until all previous *positive* dirents linking it into that dead parent directory have also expired =E2=80=94 much like we already do for garbage collection of deletion dirents in a live directory. That makes sense, but I'm not sure I like it very much. It's complex, and it really does violate my sense of decency a little =E2=80=94 if is dead when it should *stay* dead, and not return to bother us. I'll see if I can come up with a simpler solution purely within the scan code. Can you test this, please? diff --git a/fs/jffs2/build.c b/fs/jffs2/build.c index a3750f9..f5a9b0e 100644 --- a/fs/jffs2/build.c +++ b/fs/jffs2/build.c @@ -49,7 +49,8 @@ next_inode(int *i, struct jffs2_inode_cache *ic, struct j= ffs2_sb_info *c) =20 =20 static void jffs2_build_inode_pass1(struct jffs2_sb_info *c, - struct jffs2_inode_cache *ic) + struct jffs2_inode_cache *ic, + int *dir_hardlinks) { struct jffs2_full_dirent *fd; =20 @@ -71,16 +72,16 @@ static void jffs2_build_inode_pass1(struct jffs2_sb_inf= o *c, continue; } =20 + /* From this point, fd->raw is no longer used so we can set fd->ic */ + fd->ic =3D child_ic; + child_ic->pino_nlink++; + /* If we appear (at this stage) to have hard-linked directories, + * set a flag to trigger a scan later */ if (fd->type =3D=3D DT_DIR) { - if (child_ic->pino_nlink) { - JFFS2_ERROR("child dir \"%s\" (ino #%u) of dir ino #%u appears to be a= hard link\n", - fd->name, fd->ino, ic->ino); - /* TODO: What do we do about it? */ - } else { - child_ic->pino_nlink =3D ic->ino; - } - } else - child_ic->pino_nlink++; + child_ic->flags |=3D INO_FLAGS_IS_DIR; + if (child_ic->pino_nlink > 1) + *dir_hardlinks =3D 1; + } =20 dbg_fsbuild("increased nlink for child \"%s\" (ino #%u)\n", fd->name, fd= ->ino); /* Can't free scan_dents so far. We might need them in pass 2 */ @@ -94,8 +95,7 @@ static void jffs2_build_inode_pass1(struct jffs2_sb_info = *c, */ static int jffs2_build_filesystem(struct jffs2_sb_info *c) { - int ret; - int i; + int ret, i, dir_hardlinks =3D 0; struct jffs2_inode_cache *ic; struct jffs2_full_dirent *fd; struct jffs2_full_dirent *dead_fds =3D NULL; @@ -119,7 +119,7 @@ static int jffs2_build_filesystem(struct jffs2_sb_info = *c) /* Now scan the directory tree, increasing nlink according to every diren= t found. */ for_each_inode(i, c, ic) { if (ic->scan_dents) { - jffs2_build_inode_pass1(c, ic); + jffs2_build_inode_pass1(c, ic, &dir_hardlinks); cond_resched(); } } @@ -155,6 +155,20 @@ static int jffs2_build_filesystem(struct jffs2_sb_info= *c) } =20 dbg_fsbuild("pass 2a complete\n"); + + if (dir_hardlinks) { + /* If we detected directory hardlinks earlier, *hopefully* + * they are gone now because some of the links were from + * dead directories which still had some old dirents lying + * around and not yet garbage-collected, but which have + * been discarded above. So clear the pino_nlink field + * in each directory, so that the final scan below can + * print appropriate warnings. */ + for_each_inode(i, c, ic) { + if (ic->flags & INO_FLAGS_IS_DIR) + ic->pino_nlink =3D 0; + } + } dbg_fsbuild("freeing temporary data structures\n"); =20 /* Finally, we can scan again and free the dirent structs */ @@ -162,6 +176,18 @@ static int jffs2_build_filesystem(struct jffs2_sb_info= *c) while(ic->scan_dents) { fd =3D ic->scan_dents; ic->scan_dents =3D fd->next; + /* We do use the pino_nlink field to count nlink of + * directories during fs build, so set it to the + * parent ino# now. Now that there's hopefully only + * one. */ + if (fd->type =3D=3D DT_DIR) { + if (dir_hardlinks && fd->ic->pino_nlink) { + JFFS2_ERROR("child dir \"%s\" (ino #%u) of dir ino #%u is also hard l= inked from dir ino #%u\n", + fd->name, fd->ino, ic->ino, fd->ic->pino_nlink); + /* Should we unlink it from its previous parent? */ + } + fd->ic->pino_nlink =3D ic->ino; + } jffs2_free_full_dirent(fd); } ic->scan_dents =3D NULL; @@ -240,11 +266,7 @@ static void jffs2_build_remove_unlinked_inode(struct j= ffs2_sb_info *c, =20 /* Reduce nlink of the child. If it's now zero, stick it on the dead_fds list to be cleaned up later. Else just free the fd */ - - if (fd->type =3D=3D DT_DIR) - child_ic->pino_nlink =3D 0; - else - child_ic->pino_nlink--; + child_ic->pino_nlink--; =20 if (!child_ic->pino_nlink) { dbg_fsbuild("inode #%u (\"%s\") now has no links; adding to dead_fds l= ist.\n", diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h index fa35ff7..0637271 100644 --- a/fs/jffs2/nodelist.h +++ b/fs/jffs2/nodelist.h @@ -194,6 +194,7 @@ struct jffs2_inode_cache { #define INO_STATE_CLEARING 6 /* In clear_inode() */ =20 #define INO_FLAGS_XATTR_CHECKED 0x01 /* has no duplicate xattr_ref */ +#define INO_FLAGS_IS_DIR 0x02 /* is a directory */ =20 #define RAWNODE_CLASS_INODE_CACHE 0 #define RAWNODE_CLASS_XATTR_DATUM 1 @@ -249,7 +250,10 @@ struct jffs2_readinode_info =20 struct jffs2_full_dirent { - struct jffs2_raw_node_ref *raw; + union { + struct jffs2_raw_node_ref *raw; + struct jffs2_inode_cache *ic; /* Just during part of build */ + }; struct jffs2_full_dirent *next; uint32_t version; uint32_t ino; /* =3D=3D 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