From 7e4eeec8a30fa9e00cac67a37ca9ddf6cbdb79c4 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 28 Apr 2006 15:13:40 +0200 Subject: [ALSA] Make buffer size of proc text interface variable Make the read/write buffer size of proc text interface variable. Signed-off-by: Takashi Iwai --- sound/core/info.c | 149 +++++++++++++++++++++++++++++------------------------- 1 file changed, 79 insertions(+), 70 deletions(-) (limited to 'sound/core/info.c') diff --git a/sound/core/info.c b/sound/core/info.c index 9c288539e99d..86366839c4bb 100644 --- a/sound/core/info.c +++ b/sound/core/info.c @@ -21,7 +21,6 @@ #include #include -#include #include #include #include @@ -82,6 +81,24 @@ static int snd_info_version_init(void); static int snd_info_version_done(void); +/* resize the proc r/w buffer */ +static int resize_info_buffer(struct snd_info_buffer *buffer, + unsigned int nsize) +{ + char *nbuf; + + nsize = PAGE_ALIGN(nsize); + nbuf = kmalloc(nsize, GFP_KERNEL); + if (! nbuf) + return -ENOMEM; + + memcpy(nbuf, buffer->buffer, buffer->len); + kfree(buffer->buffer); + buffer->buffer = nbuf; + buffer->len = nsize; + return 0; +} + /** * snd_iprintf - printf on the procfs buffer * @buffer: the procfs buffer @@ -95,17 +112,25 @@ int snd_iprintf(struct snd_info_buffer *buffer, char *fmt,...) { va_list args; int len, res; + int err = 0; if (buffer->stop || buffer->error) return 0; len = buffer->len - buffer->size; va_start(args, fmt); - res = vsnprintf(buffer->curr, len, fmt, args); - va_end(args); - if (res >= len) { - buffer->stop = 1; - return 0; + for (;;) { + res = vsnprintf(buffer->buffer + buffer->curr, len, fmt, args); + if (res < len) + break; + err = resize_info_buffer(buffer, buffer->len + PAGE_SIZE); + if (err < 0) + break; + len = buffer->len - buffer->size; } + va_end(args); + + if (err < 0) + return err; buffer->curr += res; buffer->size += res; return res; @@ -225,7 +250,7 @@ static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer struct snd_info_private_data *data; struct snd_info_entry *entry; struct snd_info_buffer *buf; - size_t size = 0; + ssize_t size = 0; loff_t pos; data = file->private_data; @@ -241,14 +266,20 @@ static ssize_t snd_info_entry_write(struct file *file, const char __user *buffer buf = data->wbuffer; if (buf == NULL) return -EIO; - if (pos >= buf->len) - return -ENOMEM; - size = buf->len - pos; - size = min(count, size); - if (copy_from_user(buf->buffer + pos, buffer, size)) + mutex_unlock(&entry->access); + if (pos + count >= buf->len) { + if (resize_info_buffer(buf, pos + count)) { + mutex_unlock(&entry->access); + return -ENOMEM; + } + } + if (copy_from_user(buf->buffer + pos, buffer, count)) { + mutex_unlock(&entry->access); return -EFAULT; - if ((long)buf->size < pos + size) - buf->size = pos + size; + } + buf->size = pos + count; + mutex_unlock(&entry->access); + size = count; break; case SNDRV_INFO_CONTENT_DATA: if (entry->c.ops->write) @@ -283,18 +314,14 @@ static int snd_info_entry_open(struct inode *inode, struct file *file) } mode = file->f_flags & O_ACCMODE; if (mode == O_RDONLY || mode == O_RDWR) { - if ((entry->content == SNDRV_INFO_CONTENT_TEXT && - !entry->c.text.read_size) || - (entry->content == SNDRV_INFO_CONTENT_DATA && + if ((entry->content == SNDRV_INFO_CONTENT_DATA && entry->c.ops->read == NULL)) { err = -ENODEV; goto __error; } } if (mode == O_WRONLY || mode == O_RDWR) { - if ((entry->content == SNDRV_INFO_CONTENT_TEXT && - !entry->c.text.write_size) || - (entry->content == SNDRV_INFO_CONTENT_DATA && + if ((entry->content == SNDRV_INFO_CONTENT_DATA && entry->c.ops->write == NULL)) { err = -ENODEV; goto __error; @@ -310,49 +337,23 @@ static int snd_info_entry_open(struct inode *inode, struct file *file) case SNDRV_INFO_CONTENT_TEXT: if (mode == O_RDONLY || mode == O_RDWR) { buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); - if (buffer == NULL) { - kfree(data); - err = -ENOMEM; - goto __error; - } - buffer->len = (entry->c.text.read_size + - (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); - buffer->buffer = vmalloc(buffer->len); - if (buffer->buffer == NULL) { - kfree(buffer); - kfree(data); - err = -ENOMEM; - goto __error; - } - buffer->curr = buffer->buffer; + if (buffer == NULL) + goto __nomem; data->rbuffer = buffer; + buffer->len = PAGE_SIZE; + buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); + if (buffer->buffer == NULL) + goto __nomem; } if (mode == O_WRONLY || mode == O_RDWR) { buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); - if (buffer == NULL) { - if (mode == O_RDWR) { - vfree(data->rbuffer->buffer); - kfree(data->rbuffer); - } - kfree(data); - err = -ENOMEM; - goto __error; - } - buffer->len = (entry->c.text.write_size + - (PAGE_SIZE - 1)) & ~(PAGE_SIZE - 1); - buffer->buffer = vmalloc(buffer->len); - if (buffer->buffer == NULL) { - if (mode == O_RDWR) { - vfree(data->rbuffer->buffer); - kfree(data->rbuffer); - } - kfree(buffer); - kfree(data); - err = -ENOMEM; - goto __error; - } - buffer->curr = buffer->buffer; + if (buffer == NULL) + goto __nomem; data->wbuffer = buffer; + buffer->len = PAGE_SIZE; + buffer->buffer = kmalloc(buffer->len, GFP_KERNEL); + if (buffer->buffer == NULL) + goto __nomem; } break; case SNDRV_INFO_CONTENT_DATA: /* data */ @@ -377,6 +378,17 @@ static int snd_info_entry_open(struct inode *inode, struct file *file) } return 0; + __nomem: + if (data->rbuffer) { + kfree(data->rbuffer->buffer); + kfree(data->rbuffer); + } + if (data->wbuffer) { + kfree(data->wbuffer->buffer); + kfree(data->wbuffer); + } + kfree(data); + err = -ENOMEM; __error: module_put(entry->module); __error1: @@ -395,11 +407,11 @@ static int snd_info_entry_release(struct inode *inode, struct file *file) entry = data->entry; switch (entry->content) { case SNDRV_INFO_CONTENT_TEXT: - if (mode == O_RDONLY || mode == O_RDWR) { - vfree(data->rbuffer->buffer); + if (data->rbuffer) { + kfree(data->rbuffer->buffer); kfree(data->rbuffer); } - if (mode == O_WRONLY || mode == O_RDWR) { + if (data->wbuffer) { if (entry->c.text.write) { entry->c.text.write(entry, data->wbuffer); if (data->wbuffer->error) { @@ -408,7 +420,7 @@ static int snd_info_entry_release(struct inode *inode, struct file *file) data->wbuffer->error); } } - vfree(data->wbuffer->buffer); + kfree(data->wbuffer->buffer); kfree(data->wbuffer); } break; @@ -668,24 +680,22 @@ int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) if (len <= 0 || buffer->stop || buffer->error) return 1; while (--len > 0) { - c = *buffer->curr++; + c = buffer->buffer[buffer->curr++]; if (c == '\n') { - if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { + if (buffer->curr >= buffer->size) buffer->stop = 1; - } break; } *line++ = c; - if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { + if (buffer->curr >= buffer->size) { buffer->stop = 1; break; } } while (c != '\n' && !buffer->stop) { - c = *buffer->curr++; - if ((buffer->curr - buffer->buffer) >= (long)buffer->size) { + c = buffer->buffer[buffer->curr++]; + if (buffer->curr >= buffer->size) buffer->stop = 1; - } } *line = '\0'; return 0; @@ -978,7 +988,6 @@ static int __init snd_info_version_init(void) entry = snd_info_create_module_entry(THIS_MODULE, "version", NULL); if (entry == NULL) return -ENOMEM; - entry->c.text.read_size = 256; entry->c.text.read = snd_info_version_read; if (snd_info_register(entry) < 0) { snd_info_free_entry(entry); -- cgit v1.2.3-59-g8ed1b