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Groups > linux.kernel > #1362565
| From | Luis Henriques <luis.henriques@canonical.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 3.16.y-ckt 082/142] Fix directory hardlinks from deleted directories |
| Date | 2016-03-22 12:10 +0100 |
| Message-ID | <rfsmd-3ve-11@gated-at.bofh.it> (permalink) |
| References | <rfs2R-37r-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
3.16.7-ckt26 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: David Woodhouse <David.Woodhouse@intel.com>
commit be629c62a603e5935f8177fd8a19e014100a259e upstream.
When a directory is deleted, we don't take too much care about killing off
all the dirents that belong to it — on the basis that on remount, the scan
will conclude that the directory is dead anyway.
This doesn't work though, when the deleted directory contained a child
directory which was moved *out*. In the early stages of the fs build
we can then end up with an apparent hard link, with the child directory
appearing both in its true location, and as a child of the original
directory which are this stage of the mount process we don't *yet* know
is defunct.
To resolve this, take out the early special-casing of the "directories
shall not have hard links" rule in jffs2_build_inode_pass1(), and let the
normal nlink processing happen for directories as well as other inodes.
Then later in the build process we can set ic->pino_nlink to the parent
inode#, as is required for directories during normal operaton, instead
of the nlink. And complain only *then* about hard links which are still
in evidence even after killing off all the unreachable paths.
Reported-by: Liu Song <liu.song11@zte.com.cn>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
fs/jffs2/build.c | 75 ++++++++++++++++++++++++++++++++++++++++-------------
fs/jffs2/nodelist.h | 6 ++++-
2 files changed, 62 insertions(+), 19 deletions(-)
diff --git a/fs/jffs2/build.c b/fs/jffs2/build.c
index a3750f902adc..c1f04947d7dc 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 jffs2_sb_info *c)
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;
@@ -68,19 +69,21 @@ static void jffs2_build_inode_pass1(struct jffs2_sb_info *c,
dbg_fsbuild("child \"%s\" (ino #%u) of dir ino #%u doesn't exist!\n",
fd->name, fd->ino, ic->ino);
jffs2_mark_node_obsolete(c, fd->raw);
+ /* Clear the ic/raw union so it doesn't cause problems later. */
+ fd->ic = NULL;
continue;
}
+ /* From this point, fd->raw is no longer used so we can set fd->ic */
+ fd->ic = 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 == 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 = ic->ino;
- }
- } else
- child_ic->pino_nlink++;
+ child_ic->flags |= INO_FLAGS_IS_DIR;
+ if (child_ic->pino_nlink > 1)
+ *dir_hardlinks = 1;
+ }
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 +97,7 @@ 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 = 0;
struct jffs2_inode_cache *ic;
struct jffs2_full_dirent *fd;
struct jffs2_full_dirent *dead_fds = NULL;
@@ -119,7 +121,7 @@ static int jffs2_build_filesystem(struct jffs2_sb_info *c)
/* Now scan the directory tree, increasing nlink according to every dirent 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 +157,20 @@ static int jffs2_build_filesystem(struct jffs2_sb_info *c)
}
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 = 0;
+ }
+ }
dbg_fsbuild("freeing temporary data structures\n");
/* Finally, we can scan again and free the dirent structs */
@@ -162,6 +178,33 @@ static int jffs2_build_filesystem(struct jffs2_sb_info *c)
while(ic->scan_dents) {
fd = ic->scan_dents;
ic->scan_dents = 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 == DT_DIR) {
+ if (!fd->ic) {
+ /* We'll have complained about it and marked the coresponding
+ raw node obsolete already. Just skip it. */
+ continue;
+ }
+
+ /* We *have* to have set this in jffs2_build_inode_pass1() */
+ BUG_ON(!(fd->ic->flags & INO_FLAGS_IS_DIR));
+
+ /* We clear ic->pino_nlink ∀ directories' ic *only* if dir_hardlinks
+ * is set. Otherwise, we know this should never trigger anyway, so
+ * we don't do the check. And ic->pino_nlink still contains the nlink
+ * value (which is 1). */
+ if (dir_hardlinks && fd->ic->pino_nlink) {
+ JFFS2_ERROR("child dir \"%s\" (ino #%u) of dir ino #%u is also hard linked from dir ino #%u\n",
+ fd->name, fd->ino, ic->ino, fd->ic->pino_nlink);
+ /* Should we unlink it from its previous parent? */
+ }
+
+ /* For directories, ic->pino_nlink holds that parent inode # */
+ fd->ic->pino_nlink = ic->ino;
+ }
jffs2_free_full_dirent(fd);
}
ic->scan_dents = NULL;
@@ -240,11 +283,7 @@ static void jffs2_build_remove_unlinked_inode(struct jffs2_sb_info *c,
/* 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 == DT_DIR)
- child_ic->pino_nlink = 0;
- else
- child_ic->pino_nlink--;
+ child_ic->pino_nlink--;
if (!child_ic->pino_nlink) {
dbg_fsbuild("inode #%u (\"%s\") now has no links; adding to dead_fds list.\n",
diff --git a/fs/jffs2/nodelist.h b/fs/jffs2/nodelist.h
index fa35ff79ab35..0637271f3770 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() */
#define INO_FLAGS_XATTR_CHECKED 0x01 /* has no duplicate xattr_ref */
+#define INO_FLAGS_IS_DIR 0x02 /* is a directory */
#define RAWNODE_CLASS_INODE_CACHE 0
#define RAWNODE_CLASS_XATTR_DATUM 1
@@ -249,7 +250,10 @@ struct jffs2_readinode_info
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; /* == zero for unlink */
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[PATCH 3.16.y-ckt 086/142] ALSA: ctl: Fix ioctls for X32 ABI Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:10 +0100
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[PATCH 3.16.y-ckt 064/142] tg3: Fix for tg3 transmit queue 0 timed out when too many gso_segs Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
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[PATCH 3.16.y-ckt 054/142] net/mlx4_en: Count HW buffer overrun only once Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
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[PATCH 3.16.y-ckt 055/142] net/mlx4_en: Choose time-stamping shift value according to HW frequency Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 060/142] tcp: fix NULL deref in tcp_v4_send_ack() Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 040/142] sunrpc/cache: fix off-by-one in qword_get() Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 059/142] net: dp83640: Fix tx timestamp overflow handling. Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 033/142] USB: option: add support for SIM7100E Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 049/142] ARM: dts: kirkwood: use unique machine name for ds112 Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 058/142] af_iucv: Validate socket address length in iucv_sock_bind() Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 056/142] net/mlx4_en: Avoid changing dev->features directly in run-time Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 044/142] ALSA: hda - Fixing background noise on Dell Inspiron 3162 Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 050/142] bonding: Fix ARP monitor validation Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 032/142] NFSv4: Fix a dentry leak on alias use Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 057/142] unix_diag: fix incorrect sign extension in unix_lookup_by_ino Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 035/142] USB: option: add "4G LTE usb-modem U901" Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 062/142] net/ipv6: add sysctl option accept_ra_min_hop_limit Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
Re: [PATCH 3.16.y-ckt 062/142] net/ipv6: add sysctl option accept_ra_min_hop_limit Luis Henriques <luis.henriques@canonical.com> - 2016-03-24 11:20 +0100
[PATCH 3.16.y-ckt 034/142] USB: cp210x: add IDs for GE B650V3 and B850V3 boards Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 048/142] do_last(): don't let a bogus return value from ->open() et.al. to confuse us Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 047/142] hpfs: don't truncate the file when delete fails Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 052/142] af_unix: Guard against other == sk in unix_dgram_sendmsg Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 028/142] xen/pciback: Check PF instead of VF for PCI_COMMAND_MEMORY Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 038/142] can: ems_usb: Fix possible tx overflow Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 043/142] libceph: don't bail early from try_read() when skipping a message Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 042/142] tracing: Fix showing function event in available_events Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 051/142] af_unix: Don't set err in unix_stream_read_generic unless there was an error Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 036/142] hwmon: (ads1015) Handle negative conversion values correctly Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 053/142] net: phy: bcm7xxx: Fix shadow mode 2 disabling Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 041/142] KVM: async_pf: do not warn on page allocation failures Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 061/142] ipv6/udp: use sticky pktinfo egress ifindex on connect() Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 039/142] drm/radeon/pm: adjust display configuration after powerstate Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 021/142] drm/qxl: use kmalloc_array to alloc reloc_info in qxl_process_single_command Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 037/142] drivers: android: correct the size of struct binder_uintptr_t for BC_DEAD_BINDER_DONE Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:20 +0100
[PATCH 3.16.y-ckt 014/142] ALSA: seq: Drop superfluous error/debug messages after malloc failures Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 006/142] drm/i915: fix error path in intel_setup_gmbus() Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 030/142] xen/pcifront: Fix mysterious crashes when NUMA locality information was extracted. Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 004/142] drm/i915/dsi: don't pass arbitrary data to sideband Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 005/142] powerpc: Fix dedotify for binutils >= 2.26 Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 031/142] usb: dwc3: Fix assignment of EP transfer resources Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 012/142] ext4: don't read blocks from disk after extents being swapped Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 013/142] bio: return EINTR if copying to user space got interrupted Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 017/142] tracepoints: Do not trace when cpu is offline Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 019/142] ALSA: seq: Fix double port list deletion Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 003/142] drm/i915/dsi: defend gpio table against out of bounds access Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 002/142] iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 018/142] tracing: Fix freak link error caused by branch tracer Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 029/142] xen/pciback: Save the number of MSI-X entries to be copied later. Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 020/142] drm/radeon: use post-decrement in error handling Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 007/142] cifs: fix erroneous return value Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 016/142] dmaengine: dw: disable BLOCK IRQs for non-cyclic xfer Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 011/142] ext4: fix potential integer overflow Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 010/142] scsi: fix soft lockup in scsi_remove_target() on module removal Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
[PATCH 3.16.y-ckt 015/142] ALSA: seq: Fix leak of pool buffer at concurrent writes Luis Henriques <luis.henriques@canonical.com> - 2016-03-22 12:30 +0100
csiph-web