NFS: Use i_writecount to control whether to get an fscache cookie in nfs_open()
Use i_writecount to control whether to get an fscache cookie in nfs_open() as NFS does not do write caching yet. I *think* this is the cause of a problem encountered by Mark Moseley whereby __fscache_uncache_page() gets a NULL pointer dereference because cookie->def is NULL: BUG: unable to handle kernel NULL pointer dereference at 0000000000000010 IP: [<ffffffff812a1903>] __fscache_uncache_page+0x23/0x160 PGD 0 Thread overran stack, or stack corrupted Oops: 0000 [#1] SMP Modules linked in: ... CPU: 7 PID: 18993 Comm: php Not tainted 3.11.1 #1 Hardware name: Dell Inc. PowerEdge R420/072XWF, BIOS 1.3.5 08/21/2012 task: ffff8804203460c0 ti: ffff880420346640 RIP: 0010:[<ffffffff812a1903>] __fscache_uncache_page+0x23/0x160 RSP: 0018:ffff8801053af878 EFLAGS: 00210286 RAX: 0000000000000000 RBX: ffff8800be2f8780 RCX: ffff88022ffae5e8 RDX: 0000000000004c66 RSI: ffffea00055ff440 RDI: ffff8800be2f8780 RBP: ffff8801053af898 R08: 0000000000000001 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00055ff440 R13: 0000000000001000 R14: ffff8800c50be538 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88042fc60000(0063) knlGS:00000000e439c700 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 0000000000000010 CR3: 0000000001d8f000 CR4: 00000000000607f0 Stack: ... Call Trace: [<ffffffff81365a72>] __nfs_fscache_invalidate_page+0x42/0x70 [<ffffffff813553d5>] nfs_invalidate_page+0x75/0x90 [<ffffffff811b8f5e>] truncate_inode_page+0x8e/0x90 [<ffffffff811b90ad>] truncate_inode_pages_range.part.12+0x14d/0x620 [<ffffffff81d6387d>] ? __mutex_lock_slowpath+0x1fd/0x2e0 [<ffffffff811b95d3>] truncate_inode_pages_range+0x53/0x70 [<ffffffff811b969d>] truncate_inode_pages+0x2d/0x40 [<ffffffff811b96ff>] truncate_pagecache+0x4f/0x70 [<ffffffff81356840>] nfs_setattr_update_inode+0xa0/0x120 [<ffffffff81368de4>] nfs3_proc_setattr+0xc4/0xe0 [<ffffffff81357f78>] nfs_setattr+0xc8/0x150 [<ffffffff8122d95b>] notify_change+0x1cb/0x390 [<ffffffff8120a55b>] do_truncate+0x7b/0xc0 [<ffffffff8121f96c>] do_last+0xa4c/0xfd0 [<ffffffff8121ffbc>] path_openat+0xcc/0x670 [<ffffffff81220a0e>] do_filp_open+0x4e/0xb0 [<ffffffff8120ba1f>] do_sys_open+0x13f/0x2b0 [<ffffffff8126aaf6>] compat_SyS_open+0x36/0x50 [<ffffffff81d7204c>] sysenter_dispatch+0x7/0x24 The code at the instruction pointer was disassembled: > (gdb) disas __fscache_uncache_page > Dump of assembler code for function __fscache_uncache_page: > ... > 0xffffffff812a18ff <+31>: mov 0x48(%rbx),%rax > 0xffffffff812a1903 <+35>: cmpb $0x0,0x10(%rax) > 0xffffffff812a1907 <+39>: je 0xffffffff812a19cd <__fscache_uncache_page+237> These instructions make up: ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX); That cmpb is the faulting instruction (%rax is 0). So cookie->def is NULL - which presumably means that the cookie has already been at least partway through __fscache_relinquish_cookie(). What I think may be happening is something like a three-way race on the same file: PROCESS 1 PROCESS 2 PROCESS 3 =============== =============== =============== open(O_TRUNC|O_WRONLY) open(O_RDONLY) open(O_WRONLY) -->nfs_open() -->nfs_fscache_set_inode_cookie() nfs_fscache_inode_lock() nfs_fscache_disable_inode_cookie() __fscache_relinquish_cookie() nfs_inode->fscache = NULL <--nfs_fscache_set_inode_cookie() -->nfs_open() -->nfs_fscache_set_inode_cookie() nfs_fscache_inode_lock() nfs_fscache_enable_inode_cookie() __fscache_acquire_cookie() nfs_inode->fscache = cookie <--nfs_fscache_set_inode_cookie() <--nfs_open() -->nfs_setattr() ... ... -->nfs_invalidate_page() -->__nfs_fscache_invalidate_page() cookie = nfsi->fscache -->nfs_open() -->nfs_fscache_set_inode_cookie() nfs_fscache_inode_lock() nfs_fscache_disable_inode_cookie() -->__fscache_relinquish_cookie() -->__fscache_uncache_page(cookie) <crash> <--__fscache_relinquish_cookie() nfs_inode->fscache = NULL <--nfs_fscache_set_inode_cookie() What is needed is something to prevent process #2 from reacquiring the cookie - and I think checking i_writecount should do the trick. It's also possible to have a two-way race on this if the file is opened O_TRUNC|O_RDONLY instead. Reported-by: Mark Moseley <moseleymark@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
Родитель
94d30ae90a
Коммит
f1fe29b4a0
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@ -1381,7 +1381,7 @@ static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, i
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static int do_open(struct inode *inode, struct file *filp)
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{
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nfs_fscache_set_inode_cookie(inode, filp);
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nfs_fscache_open_file(inode, filp);
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return 0;
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}
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200
fs/nfs/fscache.c
200
fs/nfs/fscache.c
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@ -178,163 +178,79 @@ void nfs_fscache_release_super_cookie(struct super_block *sb)
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/*
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* Initialise the per-inode cache cookie pointer for an NFS inode.
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*/
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void nfs_fscache_init_inode_cookie(struct inode *inode)
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void nfs_fscache_init_inode(struct inode *inode)
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{
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NFS_I(inode)->fscache = NULL;
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if (S_ISREG(inode->i_mode))
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set_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
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}
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/*
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* Get the per-inode cache cookie for an NFS inode.
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*/
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static void nfs_fscache_enable_inode_cookie(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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struct nfs_inode *nfsi = NFS_I(inode);
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if (nfsi->fscache || !NFS_FSCACHE(inode))
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nfsi->fscache = NULL;
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if (!S_ISREG(inode->i_mode))
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return;
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if ((NFS_SB(sb)->options & NFS_OPTION_FSCACHE)) {
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nfsi->fscache = fscache_acquire_cookie(
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NFS_SB(sb)->fscache,
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&nfs_fscache_inode_object_def,
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nfsi, true);
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dfprintk(FSCACHE, "NFS: get FH cookie (0x%p/0x%p/0x%p)\n",
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sb, nfsi, nfsi->fscache);
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}
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nfsi->fscache = fscache_acquire_cookie(NFS_SB(inode->i_sb)->fscache,
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&nfs_fscache_inode_object_def,
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nfsi, false);
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}
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/*
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* Release a per-inode cookie.
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*/
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void nfs_fscache_release_inode_cookie(struct inode *inode)
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void nfs_fscache_clear_inode(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct fscache_cookie *cookie = nfs_i_fscache(inode);
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dfprintk(FSCACHE, "NFS: clear cookie (0x%p/0x%p)\n",
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nfsi, nfsi->fscache);
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dfprintk(FSCACHE, "NFS: clear cookie (0x%p/0x%p)\n", nfsi, cookie);
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fscache_relinquish_cookie(nfsi->fscache, 0);
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fscache_relinquish_cookie(cookie, false);
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nfsi->fscache = NULL;
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}
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/*
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* Retire a per-inode cookie, destroying the data attached to it.
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*/
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void nfs_fscache_zap_inode_cookie(struct inode *inode)
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static bool nfs_fscache_can_enable(void *data)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct inode *inode = data;
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dfprintk(FSCACHE, "NFS: zapping cookie (0x%p/0x%p)\n",
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nfsi, nfsi->fscache);
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fscache_relinquish_cookie(nfsi->fscache, 1);
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nfsi->fscache = NULL;
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return !inode_is_open_for_write(inode);
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}
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/*
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* Turn off the cache with regard to a per-inode cookie if opened for writing,
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* invalidating all the pages in the page cache relating to the associated
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* inode to clear the per-page caching.
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* Enable or disable caching for a file that is being opened as appropriate.
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* The cookie is allocated when the inode is initialised, but is not enabled at
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* that time. Enablement is deferred to file-open time to avoid stat() and
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* access() thrashing the cache.
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*
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* For now, with NFS, only regular files that are open read-only will be able
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* to use the cache.
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*
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* We enable the cache for an inode if we open it read-only and it isn't
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* currently open for writing. We disable the cache if the inode is open
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* write-only.
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*
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* The caller uses the file struct to pin i_writecount on the inode before
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* calling us when a file is opened for writing, so we can make use of that.
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*
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* Note that this may be invoked multiple times in parallel by parallel
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* nfs_open() functions.
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*/
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static void nfs_fscache_disable_inode_cookie(struct inode *inode)
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void nfs_fscache_open_file(struct inode *inode, struct file *filp)
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{
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clear_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
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struct nfs_inode *nfsi = NFS_I(inode);
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struct fscache_cookie *cookie = nfs_i_fscache(inode);
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if (NFS_I(inode)->fscache) {
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dfprintk(FSCACHE,
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"NFS: nfsi 0x%p turning cache off\n", NFS_I(inode));
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if (!fscache_cookie_valid(cookie))
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return;
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/* Need to uncache any pages attached to this inode that
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* fscache knows about before turning off the cache.
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*/
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fscache_uncache_all_inode_pages(NFS_I(inode)->fscache, inode);
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nfs_fscache_zap_inode_cookie(inode);
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if (inode_is_open_for_write(inode)) {
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dfprintk(FSCACHE, "NFS: nfsi 0x%p disabling cache\n", nfsi);
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clear_bit(NFS_INO_FSCACHE, &nfsi->flags);
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fscache_disable_cookie(cookie, true);
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fscache_uncache_all_inode_pages(cookie, inode);
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} else {
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dfprintk(FSCACHE, "NFS: nfsi 0x%p enabling cache\n", nfsi);
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fscache_enable_cookie(cookie, nfs_fscache_can_enable, inode);
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if (fscache_cookie_enabled(cookie))
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set_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
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}
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}
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/*
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* wait_on_bit() sleep function for uninterruptible waiting
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*/
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static int nfs_fscache_wait_bit(void *flags)
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{
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schedule();
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return 0;
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}
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/*
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* Lock against someone else trying to also acquire or relinquish a cookie
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*/
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static inline void nfs_fscache_inode_lock(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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while (test_and_set_bit(NFS_INO_FSCACHE_LOCK, &nfsi->flags))
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wait_on_bit(&nfsi->flags, NFS_INO_FSCACHE_LOCK,
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nfs_fscache_wait_bit, TASK_UNINTERRUPTIBLE);
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}
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/*
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* Unlock cookie management lock
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*/
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static inline void nfs_fscache_inode_unlock(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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smp_mb__before_clear_bit();
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clear_bit(NFS_INO_FSCACHE_LOCK, &nfsi->flags);
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smp_mb__after_clear_bit();
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wake_up_bit(&nfsi->flags, NFS_INO_FSCACHE_LOCK);
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}
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/*
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* Decide if we should enable or disable local caching for this inode.
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* - For now, with NFS, only regular files that are open read-only will be able
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* to use the cache.
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* - May be invoked multiple times in parallel by parallel nfs_open() functions.
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*/
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void nfs_fscache_set_inode_cookie(struct inode *inode, struct file *filp)
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{
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if (NFS_FSCACHE(inode)) {
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nfs_fscache_inode_lock(inode);
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if ((filp->f_flags & O_ACCMODE) != O_RDONLY)
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nfs_fscache_disable_inode_cookie(inode);
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else
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nfs_fscache_enable_inode_cookie(inode);
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nfs_fscache_inode_unlock(inode);
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}
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}
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EXPORT_SYMBOL_GPL(nfs_fscache_set_inode_cookie);
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/*
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* Replace a per-inode cookie due to revalidation detecting a file having
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* changed on the server.
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*/
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void nfs_fscache_reset_inode_cookie(struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct nfs_server *nfss = NFS_SERVER(inode);
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NFS_IFDEBUG(struct fscache_cookie *old = nfsi->fscache);
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nfs_fscache_inode_lock(inode);
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if (nfsi->fscache) {
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/* retire the current fscache cache and get a new one */
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fscache_relinquish_cookie(nfsi->fscache, 1);
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nfsi->fscache = fscache_acquire_cookie(
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nfss->nfs_client->fscache,
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&nfs_fscache_inode_object_def,
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nfsi, true);
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dfprintk(FSCACHE,
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"NFS: revalidation new cookie (0x%p/0x%p/0x%p/0x%p)\n",
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nfss, nfsi, old, nfsi->fscache);
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}
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nfs_fscache_inode_unlock(inode);
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}
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EXPORT_SYMBOL_GPL(nfs_fscache_open_file);
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/*
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* Release the caching state associated with a page, if the page isn't busy
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@ -344,12 +260,11 @@ void nfs_fscache_reset_inode_cookie(struct inode *inode)
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int nfs_fscache_release_page(struct page *page, gfp_t gfp)
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{
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if (PageFsCache(page)) {
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struct nfs_inode *nfsi = NFS_I(page->mapping->host);
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struct fscache_cookie *cookie = nfsi->fscache;
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struct fscache_cookie *cookie = nfs_i_fscache(page->mapping->host);
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BUG_ON(!cookie);
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dfprintk(FSCACHE, "NFS: fscache releasepage (0x%p/0x%p/0x%p)\n",
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cookie, page, nfsi);
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cookie, page, NFS_I(page->mapping->host));
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if (!fscache_maybe_release_page(cookie, page, gfp))
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return 0;
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@ -367,13 +282,12 @@ int nfs_fscache_release_page(struct page *page, gfp_t gfp)
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*/
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void __nfs_fscache_invalidate_page(struct page *page, struct inode *inode)
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{
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struct nfs_inode *nfsi = NFS_I(inode);
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struct fscache_cookie *cookie = nfsi->fscache;
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struct fscache_cookie *cookie = nfs_i_fscache(inode);
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BUG_ON(!cookie);
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dfprintk(FSCACHE, "NFS: fscache invalidatepage (0x%p/0x%p/0x%p)\n",
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cookie, page, nfsi);
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cookie, page, NFS_I(inode));
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fscache_wait_on_page_write(cookie, page);
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@ -417,9 +331,9 @@ int __nfs_readpage_from_fscache(struct nfs_open_context *ctx,
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dfprintk(FSCACHE,
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"NFS: readpage_from_fscache(fsc:%p/p:%p(i:%lx f:%lx)/0x%p)\n",
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NFS_I(inode)->fscache, page, page->index, page->flags, inode);
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nfs_i_fscache(inode), page, page->index, page->flags, inode);
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ret = fscache_read_or_alloc_page(NFS_I(inode)->fscache,
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ret = fscache_read_or_alloc_page(nfs_i_fscache(inode),
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page,
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nfs_readpage_from_fscache_complete,
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ctx,
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@ -459,9 +373,9 @@ int __nfs_readpages_from_fscache(struct nfs_open_context *ctx,
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int ret;
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dfprintk(FSCACHE, "NFS: nfs_getpages_from_fscache (0x%p/%u/0x%p)\n",
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NFS_I(inode)->fscache, npages, inode);
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nfs_i_fscache(inode), npages, inode);
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ret = fscache_read_or_alloc_pages(NFS_I(inode)->fscache,
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ret = fscache_read_or_alloc_pages(nfs_i_fscache(inode),
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mapping, pages, nr_pages,
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nfs_readpage_from_fscache_complete,
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ctx,
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@ -506,15 +420,15 @@ void __nfs_readpage_to_fscache(struct inode *inode, struct page *page, int sync)
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dfprintk(FSCACHE,
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"NFS: readpage_to_fscache(fsc:%p/p:%p(i:%lx f:%lx)/%d)\n",
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NFS_I(inode)->fscache, page, page->index, page->flags, sync);
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nfs_i_fscache(inode), page, page->index, page->flags, sync);
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ret = fscache_write_page(NFS_I(inode)->fscache, page, GFP_KERNEL);
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ret = fscache_write_page(nfs_i_fscache(inode), page, GFP_KERNEL);
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dfprintk(FSCACHE,
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"NFS: readpage_to_fscache: p:%p(i:%lu f:%lx) ret %d\n",
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page, page->index, page->flags, ret);
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if (ret != 0) {
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fscache_uncache_page(NFS_I(inode)->fscache, page);
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fscache_uncache_page(nfs_i_fscache(inode), page);
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nfs_add_fscache_stats(inode,
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NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL, 1);
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nfs_add_fscache_stats(inode, NFSIOS_FSCACHE_PAGES_UNCACHED, 1);
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@ -76,11 +76,9 @@ extern void nfs_fscache_release_client_cookie(struct nfs_client *);
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extern void nfs_fscache_get_super_cookie(struct super_block *, const char *, int);
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extern void nfs_fscache_release_super_cookie(struct super_block *);
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extern void nfs_fscache_init_inode_cookie(struct inode *);
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extern void nfs_fscache_release_inode_cookie(struct inode *);
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extern void nfs_fscache_zap_inode_cookie(struct inode *);
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extern void nfs_fscache_set_inode_cookie(struct inode *, struct file *);
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extern void nfs_fscache_reset_inode_cookie(struct inode *);
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extern void nfs_fscache_init_inode(struct inode *);
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extern void nfs_fscache_clear_inode(struct inode *);
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extern void nfs_fscache_open_file(struct inode *, struct file *);
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extern void __nfs_fscache_invalidate_page(struct page *, struct inode *);
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extern int nfs_fscache_release_page(struct page *, gfp_t);
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@ -187,12 +185,10 @@ static inline void nfs_fscache_release_client_cookie(struct nfs_client *clp) {}
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|
||||
static inline void nfs_fscache_release_super_cookie(struct super_block *sb) {}
|
||||
|
||||
static inline void nfs_fscache_init_inode_cookie(struct inode *inode) {}
|
||||
static inline void nfs_fscache_release_inode_cookie(struct inode *inode) {}
|
||||
static inline void nfs_fscache_zap_inode_cookie(struct inode *inode) {}
|
||||
static inline void nfs_fscache_set_inode_cookie(struct inode *inode,
|
||||
struct file *filp) {}
|
||||
static inline void nfs_fscache_reset_inode_cookie(struct inode *inode) {}
|
||||
static inline void nfs_fscache_init_inode(struct inode *inode) {}
|
||||
static inline void nfs_fscache_clear_inode(struct inode *inode) {}
|
||||
static inline void nfs_fscache_open_file(struct inode *inode,
|
||||
struct file *filp) {}
|
||||
|
||||
static inline int nfs_fscache_release_page(struct page *page, gfp_t gfp)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -122,7 +122,7 @@ void nfs_clear_inode(struct inode *inode)
|
|||
WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
|
||||
nfs_zap_acl_cache(inode);
|
||||
nfs_access_zap_cache(inode);
|
||||
nfs_fscache_release_inode_cookie(inode);
|
||||
nfs_fscache_clear_inode(inode);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(nfs_clear_inode);
|
||||
|
||||
|
|
@ -459,7 +459,7 @@ nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, st
|
|||
nfsi->attrtimeo_timestamp = now;
|
||||
nfsi->access_cache = RB_ROOT;
|
||||
|
||||
nfs_fscache_init_inode_cookie(inode);
|
||||
nfs_fscache_init_inode(inode);
|
||||
|
||||
unlock_new_inode(inode);
|
||||
} else
|
||||
|
|
@ -854,7 +854,7 @@ int nfs_open(struct inode *inode, struct file *filp)
|
|||
return PTR_ERR(ctx);
|
||||
nfs_file_set_open_context(filp, ctx);
|
||||
put_nfs_open_context(ctx);
|
||||
nfs_fscache_set_inode_cookie(inode, filp);
|
||||
nfs_fscache_open_file(inode, filp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -74,7 +74,7 @@ nfs4_file_open(struct inode *inode, struct file *filp)
|
|||
|
||||
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
|
||||
nfs_file_set_open_context(filp, ctx);
|
||||
nfs_fscache_set_inode_cookie(inode, filp);
|
||||
nfs_fscache_open_file(inode, filp);
|
||||
err = 0;
|
||||
|
||||
out_put_ctx:
|
||||
|
|
|
|||
|
|
@ -2292,6 +2292,11 @@ static inline void allow_write_access(struct file *file)
|
|||
if (file)
|
||||
atomic_inc(&file_inode(file)->i_writecount);
|
||||
}
|
||||
static inline bool inode_is_open_for_write(const struct inode *inode)
|
||||
{
|
||||
return atomic_read(&inode->i_writecount) > 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_IMA
|
||||
static inline void i_readcount_dec(struct inode *inode)
|
||||
{
|
||||
|
|
|
|||
|
|
@ -269,9 +269,13 @@ static inline int NFS_STALE(const struct inode *inode)
|
|||
return test_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
|
||||
}
|
||||
|
||||
static inline int NFS_FSCACHE(const struct inode *inode)
|
||||
static inline struct fscache_cookie *nfs_i_fscache(struct inode *inode)
|
||||
{
|
||||
return test_bit(NFS_INO_FSCACHE, &NFS_I(inode)->flags);
|
||||
#ifdef CONFIG_NFS_FSCACHE
|
||||
return NFS_I(inode)->fscache;
|
||||
#else
|
||||
return NULL;
|
||||
#endif
|
||||
}
|
||||
|
||||
static inline __u64 NFS_FILEID(const struct inode *inode)
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче