Merge jfs@jfs.bkbits.net:linux-2.5

into kleikamp.austin.ibm.com:/home/shaggy/bk/jfs-2.5

fs/jfs/jfs_logmgr.c

@@ -66,6 +66,7 @@
 #include <linux/completion.h>
 #include <linux/buffer_head.h>		/* for sync_blockdev() */
 #include <linux/bio.h>
+#include <linux/suspend.h>
 #include "jfs_incore.h"
 #include "jfs_filsys.h"
 #include "jfs_metapage.h"
@@ -2146,12 +2147,17 @@ int jfsIOWait(void *arg)
 			lbmStartIO(bp);
 			spin_lock_irq(&log_redrive_lock);
 		}
+		if (current->flags & PF_FREEZE) {
+			spin_unlock_irq(&log_redrive_lock);
+			refrigerator(PF_IOTHREAD);
+		} else {
 			add_wait_queue(&jfs_IO_thread_wait, &wq);
 			set_current_state(TASK_INTERRUPTIBLE);
 			spin_unlock_irq(&log_redrive_lock);
 			schedule();
 			current->state = TASK_RUNNING;
 			remove_wait_queue(&jfs_IO_thread_wait, &wq);
+		}
 	} while (!jfs_stop_threads);
 
 	jFYI(1,("jfsIOWait being killed!\n"));

fs/jfs/jfs_txnmgr.c

@@ -47,6 +47,7 @@
 #include <linux/vmalloc.h>
 #include <linux/smp_lock.h>
 #include <linux/completion.h>
+#include <linux/suspend.h>
 #include "jfs_incore.h"
 #include "jfs_filsys.h"
 #include "jfs_metapage.h"
@@ -2789,8 +2790,6 @@ int jfs_lazycommit(void *arg)
 	complete(&jfsIOwait);
 
 	do {
-		DECLARE_WAITQUEUE(wq, current);
-
 		LAZY_LOCK(flags);
 restart:
 		WorkDone = 0;
@@ -2825,12 +2824,19 @@ int jfs_lazycommit(void *arg)
 		if (WorkDone)
 			goto restart;
 
+		if (current->flags & PF_FREEZE) {
+			LAZY_UNLOCK(flags);
+			refrigerator(PF_IOTHREAD);
+		} else {
+			DECLARE_WAITQUEUE(wq, current);
+
 			add_wait_queue(&jfs_commit_thread_wait, &wq);
 			set_current_state(TASK_INTERRUPTIBLE);
 			LAZY_UNLOCK(flags);
 			schedule();
 			current->state = TASK_RUNNING;
 			remove_wait_queue(&jfs_commit_thread_wait, &wq);
+		}
 	} while (!jfs_stop_threads);
 
 	if (TxAnchor.unlock_queue)
@@ -2981,7 +2987,6 @@ int jfs_sync(void *arg)
 	complete(&jfsIOwait);
 
 	do {
-		DECLARE_WAITQUEUE(wq, current);
 		/*
 		 * write each inode on the anonymous inode list
 		 */
@@ -3030,12 +3035,20 @@ int jfs_sync(void *arg)
 		}
 		/* Add anon_list2 back to anon_list */
 		list_splice_init(&TxAnchor.anon_list2, &TxAnchor.anon_list);
+
+		if (current->flags & PF_FREEZE) {
+			TXN_UNLOCK();
+			refrigerator(PF_IOTHREAD);
+		} else {
+			DECLARE_WAITQUEUE(wq, current);
+
 			add_wait_queue(&jfs_sync_thread_wait, &wq);
 			set_current_state(TASK_INTERRUPTIBLE);
 			TXN_UNLOCK();
 			schedule();
 			current->state = TASK_RUNNING;
 			remove_wait_queue(&jfs_sync_thread_wait, &wq);
+		}
 	} while (!jfs_stop_threads);
 
 	jFYI(1, ("jfs_sync being killed\n"));

fs/jfs/xattr.c

@@ -78,6 +78,68 @@ struct ea_buffer {
 #define EA_NEW		0x0004
 #define EA_MALLOC	0x0008
 
+/* Namespaces */
+#define XATTR_SYSTEM_PREFIX "system."
+#define XATTR_SYSTEM_PREFIX_LEN (sizeof (XATTR_SYSTEM_PREFIX) - 1)
+
+#define XATTR_USER_PREFIX "user."
+#define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
+
+#define XATTR_OS2_PREFIX "os2."
+#define XATTR_OS2_PREFIX_LEN (sizeof (XATTR_OS2_PREFIX) - 1)
+
+/*
+ * These three routines are used to recognize on-disk extended attributes
+ * that are in a recognized namespace.  If the attribute is not recognized,
+ * "os2." is prepended to the name
+ */
+static inline int is_os2_xattr(struct jfs_ea *ea)
+{
+	/*
+	 * Check for "system."
+	 */
+	if ((ea->namelen >= XATTR_SYSTEM_PREFIX_LEN) &&
+	    !strncmp(ea->name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+		return FALSE;
+	/*
+	 * Check for "user."
+	 */
+	if ((ea->namelen >= XATTR_USER_PREFIX_LEN) &&
+	    !strncmp(ea->name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
+		return FALSE;
+	/*
+	 * Add any other valid namespace prefixes here
+	 */
+
+	/*
+	 * We assume it's OS/2's flat namespace
+	 */
+	return TRUE;
+}
+
+static inline int name_size(struct jfs_ea *ea)
+{
+	if (is_os2_xattr(ea))
+		return ea->namelen + XATTR_OS2_PREFIX_LEN;
+	else
+		return ea->namelen;
+}
+
+static inline int copy_name(char *buffer, struct jfs_ea *ea)
+{
+	int len = ea->namelen;
+
+	if (is_os2_xattr(ea)) {
+		memcpy(buffer, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN);
+		buffer += XATTR_OS2_PREFIX_LEN;
+		len += XATTR_OS2_PREFIX_LEN;
+	}
+	memcpy(buffer, ea->name, ea->namelen);
+	buffer[ea->namelen] = 0;
+
+	return len;
+}
+
 /* Forward references */
 static void ea_release(struct inode *inode, struct ea_buffer *ea_buf);
 
@@ -577,7 +639,8 @@ static int ea_put(struct inode *inode, struct ea_buffer *ea_buf, int new_size)
 	return rc;
 }
 
-static int can_set_xattr(struct inode *inode, const char *name)
+static int can_set_xattr(struct inode *inode, const char *name,
+			 const void *value, size_t value_len)
 {
 	if (IS_RDONLY(inode))
 		return -EROFS;
@@ -585,6 +648,10 @@ static int can_set_xattr(struct inode *inode, const char *name)
 	if (IS_IMMUTABLE(inode) || IS_APPEND(inode) || S_ISLNK(inode->i_mode))
 		return -EPERM;
 
+	if((strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) != 0) &&
+	   (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) != 0))
+		return -ENOTSUP;
+
 	if (!S_ISREG(inode->i_mode) &&
 	    (!S_ISDIR(inode->i_mode) || inode->i_mode &S_ISVTX))
 		return -EPERM;
@@ -592,7 +659,7 @@ static int can_set_xattr(struct inode *inode, const char *name)
 	return permission(inode, MAY_WRITE);
 }
 
-int __jfs_setxattr(struct inode *inode, const char *name, void *value,
+int __jfs_setxattr(struct inode *inode, const char *name, const void *value,
 		   size_t value_len, int flags)
 {
 	struct jfs_ea_list *ealist;
@@ -602,13 +669,24 @@ int __jfs_setxattr(struct inode *inode, const char *name, void *value,
 	int xattr_size;
 	int new_size;
 	int namelen = strlen(name);
+	char *os2name = NULL;
 	int found = 0;
 	int rc;
 	int length;
 
-	if ((rc = can_set_xattr(inode, name)))
+	if ((rc = can_set_xattr(inode, name, value, value_len)))
 		return rc;
 
+	if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
+		os2name = kmalloc(namelen - XATTR_OS2_PREFIX_LEN + 1,
+				  GFP_KERNEL);
+		if (!os2name)
+			return -ENOMEM;
+		strcpy(os2name, name + XATTR_OS2_PREFIX_LEN);
+		name = os2name;
+		namelen -= XATTR_OS2_PREFIX_LEN;
+	}
+
 	xattr_size = ea_get(inode, &ea_buf, 0);
 	if (xattr_size < 0) {
 		rc = xattr_size;
@@ -714,10 +792,13 @@ int __jfs_setxattr(struct inode *inode, const char *name, void *value,
       release:
 	ea_release(inode, &ea_buf);
       out:
+	if (os2name)
+		kfree(os2name);
+
 	return rc;
 }
 
-int jfs_setxattr(struct dentry *dentry, const char *name, void *value,
+int jfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 		 size_t value_len, int flags)
 {
 	if (value == NULL) {	/* empty EA, do not remove */
@@ -728,7 +809,7 @@ int jfs_setxattr(struct dentry *dentry, const char *name, void *value,
 	return __jfs_setxattr(dentry->d_inode, name, value, value_len, flags);
 }
 
-static int can_get_xattr(struct inode *inode, const char *name)
+static inline int can_get_xattr(struct inode *inode, const char *name)
 {
 	return permission(inode, MAY_READ);
 }
@@ -742,12 +823,23 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
 	int xattr_size;
 	ssize_t size;
 	int namelen = strlen(name);
+	char *os2name = NULL;
 	int rc;
 	char *value;
 
 	if ((rc = can_get_xattr(inode, name)))
 		return rc;
 
+	if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
+		os2name = kmalloc(namelen - XATTR_OS2_PREFIX_LEN + 1,
+				  GFP_KERNEL);
+		if (!os2name)
+			return -ENOMEM;
+		strcpy(os2name, name + XATTR_OS2_PREFIX_LEN);
+		name = os2name;
+		namelen -= XATTR_OS2_PREFIX_LEN;
+	}
+
 	xattr_size = ea_get(inode, &ea_buf, 0);
 	if (xattr_size < 0) {
 		size = xattr_size;
@@ -780,6 +872,8 @@ ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
       release:
 	ea_release(inode, &ea_buf);
       out:
+	if (os2name)
+		kfree(os2name);
 
 	return size;
 }
@@ -813,7 +907,7 @@ ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size)
 
 	/* compute required size of list */
 	for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea))
-		size += ea->namelen + 1;
+		size += name_size(ea) + 1;
 
 	if (!data)
 		goto release;
@@ -826,9 +920,8 @@ ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size)
 	/* Copy attribute names to buffer */
 	buffer = data;
 	for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea)) {
-		memcpy(buffer, ea->name, ea->namelen);
-		buffer[ea->namelen] = 0;
-		buffer += ea->namelen + 1;
+		int namelen = copy_name(buffer, ea);
+		buffer += namelen + 1;
 	}
 
       release: