From 65cd8ac4dcaf9d458cef40ecb4741a34050a4c43 Mon Sep 17 00:00:00 2001 From: Heiko Carstens Date: Tue, 23 Sep 2014 10:19:45 -0600 Subject: [PATCH] fs/seq_file: fallback to vmalloc allocation There are a couple of seq_files which use the single_open() interface. This interface requires that the whole output must fit into a single buffer. E.g. for /proc/stat allocation failures have been observed because an order-4 memory allocation failed due to memory fragmentation. In such situations reading /proc/stat is not possible anymore. Therefore change the seq_file code to fallback to vmalloc allocations which will usually result in a couple of order-0 allocations and hence also work if memory is fragmented. For reference a call trace where reading from /proc/stat failed: sadc: page allocation failure: order:4, mode:0x1040d0 CPU: 1 PID: 192063 Comm: sadc Not tainted 3.10.0-123.el7.s390x #1 [...] Call Trace: show_stack+0x6c/0xe8 warn_alloc_failed+0xd6/0x138 __alloc_pages_nodemask+0x9da/0xb68 __get_free_pages+0x2e/0x58 kmalloc_order_trace+0x44/0xc0 stat_open+0x5a/0xd8 proc_reg_open+0x8a/0x140 do_dentry_open+0x1bc/0x2c8 finish_open+0x46/0x60 do_last+0x382/0x10d0 path_openat+0xc8/0x4f8 do_filp_open+0x46/0xa8 do_sys_open+0x114/0x1f0 sysc_tracego+0x14/0x1a Conflicts: fs/seq_file.c Bug: 17871993 Signed-off-by: Heiko Carstens Tested-by: David Rientjes Cc: Ian Kent Cc: Hendrik Brueckner Cc: Thorsten Diehl Cc: Andrea Righi Cc: Christoph Hellwig Cc: Al Viro Cc: Stefan Bader Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Git-commit: 058504edd02667eef8fac9be27ab3ea74332e9b4 Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git Change-Id: Iad795a92fee1983c300568429a6283c48625bd9a Signed-off-by: Jeremy Gebben Signed-off-by: Naveen Ramaraj --- fs/seq_file.c | 45 ++++++++++++++++++++++++++++++++++++++------- 1 file changed, 38 insertions(+), 7 deletions(-) diff --git a/fs/seq_file.c b/fs/seq_file.c index b857a379616..df5e89002ee 100644 --- a/fs/seq_file.c +++ b/fs/seq_file.c @@ -8,7 +8,10 @@ #include #include #include +#include #include +#include +#include #include #include @@ -29,6 +32,16 @@ static void seq_set_overflow(struct seq_file *m) m->count = m->size; } +static void *seq_buf_alloc(unsigned long size) +{ + void *buf; + + buf = kmalloc(size, GFP_KERNEL | __GFP_NOWARN); + if (!buf && size > PAGE_SIZE) + buf = vmalloc(size); + return buf; +} + /** * seq_open - initialize sequential file * @file: file we initialize @@ -92,7 +105,7 @@ static int traverse(struct seq_file *m, loff_t offset) return 0; } if (!m->buf) { - m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL); + m->buf = seq_buf_alloc(m->size = PAGE_SIZE); if (!m->buf) return -ENOMEM; } @@ -131,9 +144,9 @@ static int traverse(struct seq_file *m, loff_t offset) Eoverflow: m->op->stop(m, p); - kfree(m->buf); + kvfree(m->buf); m->count = 0; - m->buf = kmalloc(m->size <<= 1, GFP_KERNEL); + m->buf = seq_buf_alloc(m->size <<= 1); return !m->buf ? -ENOMEM : -EAGAIN; } @@ -188,7 +201,7 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) /* grab buffer if we didn't have one */ if (!m->buf) { - m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL); + m->buf = seq_buf_alloc(m->size = PAGE_SIZE); if (!m->buf) goto Enomem; } @@ -228,9 +241,9 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos) if (m->count < m->size) goto Fill; m->op->stop(m, p); - kfree(m->buf); + kvfree(m->buf); m->count = 0; - m->buf = kmalloc(m->size <<= 1, GFP_KERNEL); + m->buf = seq_buf_alloc(m->size <<= 1); if (!m->buf) goto Enomem; m->version = 0; @@ -346,7 +359,7 @@ EXPORT_SYMBOL(seq_lseek); int seq_release(struct inode *inode, struct file *file) { struct seq_file *m = file->private_data; - kfree(m->buf); + kvfree(m->buf); kfree(m); return 0; } @@ -588,6 +601,24 @@ int single_open(struct file *file, int (*show)(struct seq_file *, void *), } EXPORT_SYMBOL(single_open); +int single_open_size(struct file *file, int (*show)(struct seq_file *, void *), + void *data, size_t size) +{ + char *buf = seq_buf_alloc(size); + int ret; + if (!buf) + return -ENOMEM; + ret = single_open(file, show, data); + if (ret) { + kvfree(buf); + return ret; + } + ((struct seq_file *)file->private_data)->buf = buf; + ((struct seq_file *)file->private_data)->size = size; + return 0; +} +EXPORT_SYMBOL(single_open_size); + int single_release(struct inode *inode, struct file *file) { const struct seq_operations *op = ((struct seq_file *)file->private_data)->op;