- inotify
- a powerful yet simple file change notification system
+ inotify
+ a powerful yet simple file change notification system
Document started 15 Mar 2005 by Robert Love <rml@novell.com>
+
(i) User Interface
-Inotify is controlled by a set of three sys calls
+Inotify is controlled by a set of three system calls and normal file I/O on a
+returned file descriptor.
-First step in using inotify is to initialise an inotify instance
+First step in using inotify is to initialise an inotify instance:
int fd = inotify_init ();
+Each instance is associated with a unique, ordered queue.
+
Change events are managed by "watches". A watch is an (object,mask) pair where
the object is a file or directory and the mask is a bit mask of one or more
inotify events that the application wishes to receive. See <linux/inotify.h>
Watches on a directory will return events on any files inside of the directory.
-Adding a watch is simple,
+Adding a watch is simple:
int wd = inotify_add_watch (fd, path, mask);
-You can add a large number of files via something like
-
- for each file to watch {
- int wd = inotify_add_watch (fd, file, mask);
- }
+Where "fd" is the return value from inotify_init(), path is the path to the
+object to watch, and mask is the watch mask (see <linux/inotify.h>).
You can update an existing watch in the same manner, by passing in a new mask.
-An existing watch is removed via the INOTIFY_IGNORE ioctl, for example
+An existing watch is removed via
- inotify_rm_watch (fd, wd);
+ int ret = inotify_rm_watch (fd, wd);
Events are provided in the form of an inotify_event structure that is read(2)
-from a inotify instance fd. The filename is of dynamic length and follows the
-struct. It is of size len. The filename is padded with null bytes to ensure
-proper alignment. This padding is reflected in len.
+from a given inotify instance. The filename is of dynamic length and follows
+the struct. It is of size len. The filename is padded with null bytes to
+ensure proper alignment. This padding is reflected in len.
You can slurp multiple events by passing a large buffer, for example
size_t len = read (fd, buf, BUF_LEN);
-Will return as many events as are available and fit in BUF_LEN.
+Where "buf" is a pointer to an array of "inotify_event" structures at least
+BUF_LEN bytes in size. The above example will return as many events as are
+available and fit in BUF_LEN.
-each inotify instance fd is also select()- and poll()-able.
+Each inotify instance fd is also select()- and poll()-able.
-You can find the size of the current event queue via the FIONREAD ioctl.
+You can find the size of the current event queue via the standard FIONREAD
+ioctl on the fd returned by inotify_init().
All watches are destroyed and cleaned up on close.
-(ii) Internal Kernel Implementation
+(ii)
+
+Prototypes:
+
+ int inotify_init (void);
+ int inotify_add_watch (int fd, const char *path, __u32 mask);
+ int inotify_rm_watch (int fd, __u32 mask);
+
-Each open inotify instance is associated with an inotify_device structure.
+(iii) Internal Kernel Implementation
+
+Each inotify instance is associated with an inotify_device structure.
Each watch is associated with an inotify_watch structure. Watches are chained
off of each associated device and each associated inode.
See fs/inotify.c for the locking and lifetime rules.
-(iii) Rationale
+(iv) Rationale
Q: What is the design decision behind not tying the watch to the open fd of
the watched object?
This solves the primary problem with dnotify: keeping the file open pins
the file and thus, worse, pins the mount. Dnotify is therefore infeasible
for use on a desktop system with removable media as the media cannot be
- unmounted.
+ unmounted. Watching a file should not require that it be open.
-Q: What is the design decision behind using an-fd-per-device as opposed to
+Q: What is the design decision behind using an-fd-per-instance as opposed to
an fd-per-watch?
A: An fd-per-watch quickly consumes more file descriptors than are allowed,
can use epoll, but requiring both is a silly and extraneous requirement.
A watch consumes less memory than an open file, separating the number
spaces is thus sensible. The current design is what user-space developers
- want: Users initialize inotify, once, and add n watches, requiring but one fd
- and no twiddling with fd limits. Initializing an inotify instance two
+ want: Users initialize inotify, once, and add n watches, requiring but one
+ fd and no twiddling with fd limits. Initializing an inotify instance two
thousand times is silly. If we can implement user-space's preferences
cleanly--and we can, the idr layer makes stuff like this trivial--then we
should.
example, love it. Trust me, I asked. It is not a surprise: Who'd want
to manage and block on 1000 fd's via select?
- - You'd have to manage the fd's, as an example: Call close() when you
- received a delete event.
-
- No way to get out of band data.
- 1024 is still too low. ;-)
scales to 1000s of directories, juggling 1000s of fd's just does not seem
the right interface. It is too heavy.
+ Additionally, it _is_ possible to more than one instance and
+ juggle more than one queue and thus more than one associated fd. There
+ need not be a one-fd-per-process mapping; it is one-fd-per-queue and a
+ process can easily want more than one queue.
+
Q: Why the system call approach?
A: The poor user-space interface is the second biggest problem with dnotify.
Obtaining the fd and managing the watches could have been done either via a
device file or a family of new system calls. We decided to implement a
family of system calls because that is the preffered approach for new kernel
- features and it means our user interface requirements.
-
- Additionally, it _is_ possible to more than one instance and
- juggle more than one queue and thus more than one associated fd.
+ interfaces. The only real difference was whether we wanted to use open(2)
+ and ioctl(2) or a couple of new system calls. System calls beat ioctls.
L: linux-joystick@atrey.karlin.mff.cuni.cz
S: Maintained
+INOTIFY
+P: John McCutchan and Robert Love
+M: ttb@tentacle.dhs.org and rml@novell.com
+L: linux-kernel@vger.kernel.org
+S: Maintained
+
INTEL 810/815 FRAMEBUFFER DRIVER
P: Antonino Daplas
M: adaplas@pol.net
#include "piix4.h"
void (*pm_power_off)(void);
+EXPORT_SYMBOL(pm_power_off);
void machine_restart(char * __unused)
{
parent = &sysfs_nodes[cpu_to_node(num)];
#endif /* CONFIG_NUMA */
+#ifdef CONFIG_ACPI_BOOT
/*
* If CPEI cannot be re-targetted, and this is
* CPEI target, then dont create the control file
*/
if (!can_cpei_retarget() && is_cpu_cpei_target(num))
sysfs_cpus[num].cpu.no_control = 1;
+#endif
return register_cpu(&sysfs_cpus[num].cpu, num, parent);
}
ToRecv = space;
if (ToRecv <= 0)
- return;
+ goto done;
/*
* if status indicates there are errored characters in the
}
/* Push the data up to the tty layer */
ld->receive_buf(tty, tty->flip.char_buf, tty->flip.flag_buf, count);
+done:
tty_ldisc_deref(ld);
}
return;
if (vesa_off_interval) {
- blank_state = blank_vesa_wait,
+ blank_state = blank_vesa_wait;
mod_timer(&console_timer, jiffies + vesa_off_interval);
}
}
}
-int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks)
+int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks,
+ int degraded)
{
bitmap_counter_t *bmc;
int rv;
rv = 1;
else if (NEEDED(*bmc)) {
rv = 1;
- *bmc |= RESYNC_MASK;
- *bmc &= ~NEEDED_MASK;
+ if (!degraded) { /* don't set/clear bits if degraded */
+ *bmc |= RESYNC_MASK;
+ *bmc &= ~NEEDED_MASK;
+ }
}
}
spin_unlock_irq(&bitmap->lock);
sector_t space = conf->hash_spacing;
int round;
conf->preshift = 0;
- if (sizeof(sector_t) > sizeof(unsigned long)) {
+ if (sizeof(sector_t) > sizeof(u32)) {
/*shift down space and s so that sector_div will work */
- while (space > (sector_t) (~(unsigned long)0)) {
+ while (space > (sector_t) (~(u32)0)) {
s >>= 1;
space >>= 1;
s += 1; /* force round-up */
conf->preshift++;
}
}
- round = sector_div(s, (unsigned long)space) ? 1 : 0;
+ round = sector_div(s, (u32)space) ? 1 : 0;
nb_zone = s + round;
}
printk("raid0 : nb_zone is %d.\n", nb_zone);
volatile
#endif
sector_t x = block >> conf->preshift;
- sector_div(x, (unsigned long)conf->hash_spacing);
+ sector_div(x, (u32)conf->hash_spacing);
zone = conf->hash_table[x];
}
* only be one in raid1 resync.
* We can find the current addess in mddev->curr_resync
*/
- if (!conf->fullsync) {
- if (mddev->curr_resync < max_sector)
- bitmap_end_sync(mddev->bitmap,
- mddev->curr_resync,
+ if (mddev->curr_resync < max_sector) /* aborted */
+ bitmap_end_sync(mddev->bitmap, mddev->curr_resync,
&sync_blocks, 1);
- bitmap_close_sync(mddev->bitmap);
- }
- if (mddev->curr_resync >= max_sector)
+ else /* completed sync */
conf->fullsync = 0;
+
+ bitmap_close_sync(mddev->bitmap);
close_sync(conf);
return 0;
}
- if (!conf->fullsync &&
- !bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks)) {
+ if (!bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, mddev->degraded) &&
+ !conf->fullsync) {
/* We can skip this block, and probably several more */
*skipped = 1;
return sync_blocks;
len = (max_sector - sector_nr) << 9;
if (len == 0)
break;
- if (!conf->fullsync) {
- if (sync_blocks == 0) {
- if (!bitmap_start_sync(mddev->bitmap,
- sector_nr, &sync_blocks))
- break;
- if (sync_blocks < (PAGE_SIZE>>9))
- BUG();
- if (len > (sync_blocks<<9)) len = sync_blocks<<9;
- }
+ if (sync_blocks == 0) {
+ if (!bitmap_start_sync(mddev->bitmap, sector_nr,
+ &sync_blocks, mddev->degraded) &&
+ !conf->fullsync)
+ break;
+ if (sync_blocks < (PAGE_SIZE>>9))
+ BUG();
+ if (len > (sync_blocks<<9))
+ len = sync_blocks<<9;
}
for (i=0 ; i < conf->raid_disks; i++) {
while (i > 0) {
i--;
bio = r1_bio->bios[i];
- if (bio->bi_end_io==NULL) continue;
+ if (bio->bi_end_io==NULL)
+ continue;
/* remove last page from this bio */
bio->bi_vcnt--;
bio->bi_size -= len;
/*
- * $Id: cx88-cards.c,v 1.85 2005/07/04 19:35:05 mkrufky Exp $
+ * $Id: cx88-cards.c,v 1.86 2005/07/14 03:06:43 mchehab Exp $
*
* device driver for Conexant 2388x based TV cards
* card-specific stuff.
.name = "PixelView PlayTV Ultra Pro (Stereo)",
/* May be also TUNER_YMEC_TVF_5533MF for NTSC/M or PAL/M */
.tuner_type = TUNER_PHILIPS_FM1216ME_MK3,
- .radio_type = TUNER_TEA5767,
- .tuner_addr = 0xc2>>1,
- .radio_addr = 0xc0>>1,
+ .radio_type = UNSET,
+ .tuner_addr = ADDR_UNSET,
+ .radio_addr = ADDR_UNSET,
.input = {{
.type = CX88_VMUX_TELEVISION,
.vmux = 0,
/*
- * $Id: cx88-dvb.c,v 1.41 2005/07/04 19:35:05 mkrufky Exp $
+ * $Id: cx88-dvb.c,v 1.42 2005/07/12 15:44:55 mkrufky Exp $
*
* device driver for Conexant 2388x based TV cards
* MPEG Transport Stream (DVB) routines
#if CONFIG_DVB_CX22702
static struct cx22702_config connexant_refboard_config = {
.demod_address = 0x43,
+ .output_mode = CX22702_SERIAL_OUTPUT,
.pll_address = 0x60,
.pll_desc = &dvb_pll_thomson_dtt7579,
};
static struct cx22702_config hauppauge_novat_config = {
.demod_address = 0x43,
+ .output_mode = CX22702_SERIAL_OUTPUT,
.pll_address = 0x61,
.pll_desc = &dvb_pll_thomson_dtt759x,
};
/*
- * $Id: cx88-video.c,v 1.79 2005/07/07 14:17:47 mchehab Exp $
+ * $Id: cx88-video.c,v 1.80 2005/07/13 08:49:08 mchehab Exp $
*
* device driver for Conexant 2388x based TV cards
* video4linux video interface
dev->freq = f->frequency;
cx88_newstation(core);
cx88_call_i2c_clients(dev->core,VIDIOC_S_FREQUENCY,f);
+
+ /* When changing channels it is required to reset TVAUDIO */
+ msleep (10);
+ cx88_set_tvaudio(core);
+
up(&dev->lock);
return 0;
}
/*
- * $Id: cx88.h,v 1.68 2005/07/07 14:17:47 mchehab Exp $
+ * $Id: cx88.h,v 1.69 2005/07/13 17:25:25 mchehab Exp $
*
* v4l2 device driver for cx2388x based TV cards
*
#include "btcx-risc.h"
#include "cx88-reg.h"
-#include <linux/version.h>
-#define CX88_VERSION_CODE KERNEL_VERSION(0,0,4)
+#include <linux/utsname.h>
+#define CX88_VERSION_CODE KERNEL_VERSION(0,0,5)
#ifndef TRUE
# define TRUE (1==1)
* For Philips TEA5767 FM Chip used on some TV Cards like Prolink Pixelview
* I2C address is allways 0xC0.
*
- * $Id: tea5767.c,v 1.18 2005/07/07 03:02:55 mchehab Exp $
+ * $Id: tea5767.c,v 1.21 2005/07/14 03:06:43 mchehab Exp $
*
* Copyright (c) 2005 Mauro Carvalho Chehab (mchehab@brturbo.com.br)
* This code is placed under the terms of the GNU General Public License
switch (TEA5767_HIGH_LO_32768) {
case TEA5767_HIGH_LO_13MHz:
- frq = 1000 * (div * 50 - 700 - 225) / 4; /* Freq in KHz */
+ frq = (div * 50000 - 700000 - 225000) / 4; /* Freq in KHz */
break;
case TEA5767_LOW_LO_13MHz:
- frq = 1000 * (div * 50 + 700 + 225) / 4; /* Freq in KHz */
+ frq = (div * 50000 + 700000 + 225000) / 4; /* Freq in KHz */
break;
case TEA5767_LOW_LO_32768:
- frq = 1000 * (div * 32768 / 1000 + 700 + 225) / 4; /* Freq in KHz */
+ frq = (div * 32768 + 700000 + 225000) / 4; /* Freq in KHz */
break;
case TEA5767_HIGH_LO_32768:
default:
- frq = 1000 * (div * 32768 / 1000 - 700 - 225) / 4; /* Freq in KHz */
+ frq = (div * 32768 - 700000 - 225000) / 4; /* Freq in KHz */
break;
}
buffer[0] = (div >> 8) & 0x3f;
unsigned div;
int rc;
- tuner_dbg (PREFIX "radio freq counter %d\n", frq);
+ tuner_dbg (PREFIX "radio freq = %d.%03d MHz\n", frq/16000,(frq/16)%1000);
/* Rounds freq to next decimal value - for 62.5 KHz step */
/* frq = 20*(frq/16)+radio_frq[frq%16]; */
tuner_dbg ("TEA5767 radio HIGH LO inject xtal @ 13 MHz\n");
buffer[2] |= TEA5767_HIGH_LO_INJECT;
buffer[4] |= TEA5767_PLLREF_ENABLE;
- div = (frq * 4 / 16 + 700 + 225 + 25) / 50;
+ div = (frq * 4000 / 16 + 700000 + 225000 + 25000) / 50000;
break;
case TEA5767_LOW_LO_13MHz:
tuner_dbg ("TEA5767 radio LOW LO inject xtal @ 13 MHz\n");
buffer[4] |= TEA5767_PLLREF_ENABLE;
- div = (frq * 4 / 16 - 700 - 225 + 25) / 50;
+ div = (frq * 4000 / 16 - 700000 - 225000 + 25000) / 50000;
break;
case TEA5767_LOW_LO_32768:
tuner_dbg ("TEA5767 radio LOW LO inject xtal @ 32,768 MHz\n");
buffer[3] |= TEA5767_XTAL_32768;
/* const 700=4000*175 Khz - to adjust freq to right value */
- div = (1000 * (frq * 4 / 16 - 700 - 225) + 16384) >> 15;
+ div = ((frq * 4000 / 16 - 700000 - 225000) + 16384) >> 15;
break;
case TEA5767_HIGH_LO_32768:
default:
buffer[2] |= TEA5767_HIGH_LO_INJECT;
buffer[3] |= TEA5767_XTAL_32768;
- div = (1000 * (frq * 4 / 16 + 700 + 225) + 16384) >> 15;
+ div = ((frq * (4000 / 16) + 700000 + 225000) + 16384) >> 15;
break;
}
buffer[0] = (div >> 8) & 0x3f;
buffer[1] = div & 0xff;
- if (tuner_debug)
- tea5767_status_dump(buffer);
-
if (5 != (rc = i2c_master_send(c, buffer, 5)))
tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
+
+ if (tuner_debug) {
+ if (5 != (rc = i2c_master_recv(c, buffer, 5)))
+ tuner_warn("i2c i/o error: rc == %d (should be 5)\n", rc);
+ else
+ tea5767_status_dump(buffer);
+ }
}
static int tea5767_signal(struct i2c_client *c)
struct tuner *t = i2c_get_clientdata(c);
if (5 != (rc = i2c_master_recv(c, buffer, 5))) {
- tuner_warn("it is not a TEA5767. Received %i chars.\n", rc);
+ tuner_warn("It is not a TEA5767. Received %i bytes.\n", rc);
return EINVAL;
}
* bit 0 : internally set to 0
* Byte 5: bit 7:0 : == 0
*/
-
if (!((buffer[3] & 0x0f) == 0x00) && (buffer[4] == 0x00)) {
tuner_warn("Chip ID is not zero. It is not a TEA5767\n");
return EINVAL;
}
+
tuner_warn("TEA5767 detected.\n");
return 0;
}
/*
- * $Id: tuner-core.c,v 1.55 2005/07/08 13:20:33 mchehab Exp $
+ * $Id: tuner-core.c,v 1.58 2005/07/14 03:06:43 mchehab Exp $
*
* i2c tv tuner chip device driver
* core core, i.e. kernel interfaces, registering and so on
static unsigned int addr = 0;
module_param(addr, int, 0444);
+static unsigned int no_autodetect = 0;
+module_param(no_autodetect, int, 0444);
+
/* insmod options used at runtime => read/write */
unsigned int tuner_debug = 0;
module_param(tuner_debug, int, 0644);
tuner_info("chip found @ 0x%x (%s)\n", addr << 1, adap->name);
/* TEA5767 autodetection code - only for addr = 0xc0 */
- if (addr == 0x60) {
- if (tea5767_autodetection(&t->i2c) != EINVAL) {
- t->type = TUNER_TEA5767;
- t->mode_mask = T_RADIO;
- t->mode = T_STANDBY;
- t->freq = 87.5 * 16; /* Sets freq to FM range */
- default_mode_mask &= ~T_RADIO;
-
- i2c_attach_client (&t->i2c);
- set_type(&t->i2c,t->type, t->mode_mask);
- return 0;
+ if (!no_autodetect) {
+ if (addr == 0x60) {
+ if (tea5767_autodetection(&t->i2c) != EINVAL) {
+ t->type = TUNER_TEA5767;
+ t->mode_mask = T_RADIO;
+ t->mode = T_STANDBY;
+ t->freq = 87.5 * 16; /* Sets freq to FM range */
+ default_mode_mask &= ~T_RADIO;
+
+ i2c_attach_client (&t->i2c);
+ set_type(&t->i2c,t->type, t->mode_mask);
+ return 0;
+ }
}
}
break;
}
default:
- tuner_dbg("Unimplemented IOCTL 0x%08x called to tuner.\n", cmd);
+ tuner_dbg("Unimplemented IOCTL 0x%08x(dir=%d,tp=0x%02x,nr=%d,sz=%d)\n",
+ cmd, _IOC_DIR(cmd), _IOC_TYPE(cmd),
+ _IOC_NR(cmd), _IOC_SIZE(cmd));
break;
}
#include "xip.h"
static inline int
-__inode_direct_access(struct inode *inode, sector_t sector, unsigned long *data) {
+__inode_direct_access(struct inode *inode, sector_t sector,
+ unsigned long *data)
+{
BUG_ON(!inode->i_sb->s_bdev->bd_disk->fops->direct_access);
return inode->i_sb->s_bdev->bd_disk->fops
->direct_access(inode->i_sb->s_bdev,sector,data);
}
+static inline int
+__ext2_get_sector(struct inode *inode, sector_t offset, int create,
+ sector_t *result)
+{
+ struct buffer_head tmp;
+ int rc;
+
+ memset(&tmp, 0, sizeof(struct buffer_head));
+ rc = ext2_get_block(inode, offset/ (PAGE_SIZE/512), &tmp,
+ create);
+ *result = tmp.b_blocknr;
+
+ /* did we get a sparse block (hole in the file)? */
+ if (!(*result)) {
+ BUG_ON(create);
+ rc = -ENODATA;
+ }
+
+ return rc;
+}
+
int
-ext2_clear_xip_target(struct inode *inode, int block) {
- sector_t sector = block*(PAGE_SIZE/512);
+ext2_clear_xip_target(struct inode *inode, int block)
+{
+ sector_t sector = block * (PAGE_SIZE/512);
unsigned long data;
int rc;
rc = __inode_direct_access(inode, sector, &data);
- if (rc)
- return rc;
- clear_page((void*)data);
- return 0;
+ if (!rc)
+ clear_page((void*)data);
+ return rc;
}
void ext2_xip_verify_sb(struct super_block *sb)
{
struct ext2_sb_info *sbi = EXT2_SB(sb);
- if ((sbi->s_mount_opt & EXT2_MOUNT_XIP)) {
- if ((sb->s_bdev == NULL) ||
- sb->s_bdev->bd_disk == NULL ||
- sb->s_bdev->bd_disk->fops == NULL ||
- sb->s_bdev->bd_disk->fops->direct_access == NULL) {
- sbi->s_mount_opt &= (~EXT2_MOUNT_XIP);
- ext2_warning(sb, __FUNCTION__,
- "ignoring xip option - not supported by bdev");
- }
+ if ((sbi->s_mount_opt & EXT2_MOUNT_XIP) &&
+ !sb->s_bdev->bd_disk->fops->direct_access) {
+ sbi->s_mount_opt &= (~EXT2_MOUNT_XIP);
+ ext2_warning(sb, __FUNCTION__,
+ "ignoring xip option - not supported by bdev");
}
}
-struct page*
-ext2_get_xip_page(struct address_space *mapping, sector_t blockno,
+struct page *
+ext2_get_xip_page(struct address_space *mapping, sector_t offset,
int create)
{
int rc;
unsigned long data;
- struct buffer_head tmp;
+ sector_t sector;
- tmp.b_state = 0;
- tmp.b_blocknr = 0;
- rc = ext2_get_block(mapping->host, blockno/(PAGE_SIZE/512) , &tmp,
- create);
+ /* first, retrieve the sector number */
+ rc = __ext2_get_sector(mapping->host, offset, create, §or);
if (rc)
- return ERR_PTR(rc);
- if (tmp.b_blocknr == 0) {
- /* SPARSE block */
- BUG_ON(create);
- return ERR_PTR(-ENODATA);
- }
+ goto error;
+ /* retrieve address of the target data */
rc = __inode_direct_access
- (mapping->host,tmp.b_blocknr*(PAGE_SIZE/512) ,&data);
- if (rc)
- return ERR_PTR(rc);
+ (mapping->host, sector * (PAGE_SIZE/512), &data);
+ if (!rc)
+ return virt_to_page(data);
- SetPageUptodate(virt_to_page(data));
- return virt_to_page(data);
+ error:
+ return ERR_PTR(rc);
}
int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors);
void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors,
int success);
-int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks);
+int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int degraded);
void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted);
void bitmap_close_sync(struct bitmap *bitmap);
if (unlikely(IS_ERR(page))) {
if (PTR_ERR(page) == -ENODATA) {
/* sparse */
- page = virt_to_page(empty_zero_page);
+ page = ZERO_PAGE(0);
} else {
desc->error = PTR_ERR(page);
goto out;
}
- } else
- BUG_ON(!PageUptodate(page));
+ }
/* If users can be writing to this page using arbitrary
* virtual addresses, take care about potential aliasing
flush_dcache_page(page);
/*
- * Ok, we have the page, and it's up-to-date, so
- * now we can copy it to user space...
+ * Ok, we have the page, so now we can copy it to user space...
*
* The actor routine returns how many bytes were actually used..
* NOTE! This may not be the same as how much of a user buffer
* xip_write
*
* This function walks all vmas of the address_space and unmaps the
- * empty_zero_page when found at pgoff. Should it go in rmap.c?
+ * ZERO_PAGE when found at pgoff. Should it go in rmap.c?
*/
static void
__xip_unmap (struct address_space * mapping,
* We need the page_table_lock to protect us from page faults,
* munmap, fork, etc...
*/
- pte = page_check_address(virt_to_page(empty_zero_page), mm,
+ pte = page_check_address(ZERO_PAGE(address), mm,
address);
if (!IS_ERR(pte)) {
/* Nuke the page table entry. */
page = mapping->a_ops->get_xip_page(mapping, pgoff*(PAGE_SIZE/512), 0);
if (!IS_ERR(page)) {
- BUG_ON(!PageUptodate(page));
return page;
}
if (PTR_ERR(page) != -ENODATA)
pgoff*(PAGE_SIZE/512), 1);
if (IS_ERR(page))
return NULL;
- BUG_ON(!PageUptodate(page));
/* unmap page at pgoff from all other vmas */
__xip_unmap(mapping, pgoff);
} else {
- /* not shared and writable, use empty_zero_page */
- page = virt_to_page(empty_zero_page);
+ /* not shared and writable, use ZERO_PAGE() */
+ page = ZERO_PAGE(address);
}
return page;
break;
}
- BUG_ON(!PageUptodate(page));
-
copied = filemap_copy_from_user(page, offset, buf, bytes);
flush_dcache_page(page);
if (likely(copied > 0)) {
return 0;
else
return PTR_ERR(page);
- } else
- BUG_ON(!PageUptodate(page));
+ }
kaddr = kmap_atomic(page, KM_USER0);
memset(kaddr + offset, 0, length);
kunmap_atomic(kaddr, KM_USER0);
git://ftp.safe.ca / safe / jmp / linux-2.6 / commitdiff