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223df0161f
Add support for the FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE mode of fallocate(2). Mimic the behavior of other native file systems such as ext4 in cases where the file might be extended. If the offset is beyond the end of the file, return success without changing the file. If the extent of the punched hole would extend the file, only the existing tail of the file is punched. Add the zfs_zero_partial_page() function, modeled after update_page(), to handle zeroing partial pages in a hole-punching operation. It must be used under a range lock for the requested region in order that the ARC and page cache stay in sync. Move the existing page cache truncation via truncate_setsize() into zfs_freesp() for better source structure compatibility with upstream code. Add page cache truncation to zfs_freesp() and zfs_free_range() to handle hole punching. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #2619
189 lines
5.6 KiB
C
189 lines
5.6 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2011, Lawrence Livermore National Security, LLC.
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*/
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#ifndef _SYS_ZPL_H
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#define _SYS_ZPL_H
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#include <sys/vfs.h>
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#include <linux/vfs_compat.h>
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#include <linux/xattr_compat.h>
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#include <linux/dcache_compat.h>
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#include <linux/exportfs.h>
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#include <linux/writeback.h>
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#include <linux/falloc.h>
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#include <linux/task_io_accounting_ops.h>
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#include <linux/aio.h>
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/* zpl_inode.c */
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extern void zpl_vap_init(vattr_t *vap, struct inode *dir,
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zpl_umode_t mode, cred_t *cr);
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extern const struct inode_operations zpl_inode_operations;
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extern const struct inode_operations zpl_dir_inode_operations;
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extern const struct inode_operations zpl_symlink_inode_operations;
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extern const struct inode_operations zpl_special_inode_operations;
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extern dentry_operations_t zpl_dentry_operations;
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/* zpl_file.c */
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extern ssize_t zpl_read_common(struct inode *ip, const char *buf,
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size_t len, loff_t *ppos, uio_seg_t segment, int flags,
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cred_t *cr);
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extern ssize_t zpl_write_common(struct inode *ip, const char *buf,
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size_t len, loff_t *ppos, uio_seg_t segment, int flags,
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cred_t *cr);
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#if defined(HAVE_FILE_FALLOCATE) || defined(HAVE_INODE_FALLOCATE)
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extern long zpl_fallocate_common(struct inode *ip, int mode,
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loff_t offset, loff_t len);
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#endif /* defined(HAVE_FILE_FALLOCATE) || defined(HAVE_INODE_FALLOCATE) */
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extern const struct address_space_operations zpl_address_space_operations;
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extern const struct file_operations zpl_file_operations;
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extern const struct file_operations zpl_dir_file_operations;
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/* zpl_super.c */
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extern void zpl_prune_sbs(int64_t bytes_to_scan, void *private);
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typedef struct zpl_mount_data {
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const char *z_osname; /* Dataset name */
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void *z_data; /* Mount options string */
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} zpl_mount_data_t;
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extern const struct super_operations zpl_super_operations;
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extern const struct export_operations zpl_export_operations;
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extern struct file_system_type zpl_fs_type;
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/* zpl_xattr.c */
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extern ssize_t zpl_xattr_list(struct dentry *dentry, char *buf, size_t size);
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extern int zpl_xattr_security_init(struct inode *ip, struct inode *dip,
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const struct qstr *qstr);
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#if defined(CONFIG_FS_POSIX_ACL)
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extern int zpl_set_acl(struct inode *ip, int type, struct posix_acl *acl);
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extern struct posix_acl *zpl_get_acl(struct inode *ip, int type);
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#if !defined(HAVE_GET_ACL)
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#if defined(HAVE_CHECK_ACL_WITH_FLAGS)
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extern int zpl_check_acl(struct inode *inode, int mask, unsigned int flags);
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#elif defined(HAVE_CHECK_ACL)
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extern int zpl_check_acl(struct inode *inode, int mask);
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#elif defined(HAVE_PERMISSION_WITH_NAMEIDATA)
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extern int zpl_permission(struct inode *ip, int mask, struct nameidata *nd);
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#elif defined(HAVE_PERMISSION)
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extern int zpl_permission(struct inode *ip, int mask);
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#endif /* HAVE_CHECK_ACL | HAVE_PERMISSION */
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#endif /* HAVE_GET_ACL */
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extern int zpl_init_acl(struct inode *ip, struct inode *dir);
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extern int zpl_chmod_acl(struct inode *ip);
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#else
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static inline int
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zpl_init_acl(struct inode *ip, struct inode *dir)
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{
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return (0);
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}
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static inline int
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zpl_chmod_acl(struct inode *ip)
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{
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return (0);
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}
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#endif /* CONFIG_FS_POSIX_ACL */
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extern xattr_handler_t *zpl_xattr_handlers[];
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/* zpl_ctldir.c */
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extern const struct file_operations zpl_fops_root;
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extern const struct inode_operations zpl_ops_root;
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extern const struct file_operations zpl_fops_snapdir;
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extern const struct inode_operations zpl_ops_snapdir;
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#ifdef HAVE_AUTOMOUNT
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extern const struct dentry_operations zpl_dops_snapdirs;
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#else
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extern const struct inode_operations zpl_ops_snapdirs;
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#endif /* HAVE_AUTOMOUNT */
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extern const struct file_operations zpl_fops_shares;
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extern const struct inode_operations zpl_ops_shares;
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#ifdef HAVE_VFS_ITERATE
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#define DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
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.actor = _actor, \
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.pos = _pos, \
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}
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#else
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typedef struct dir_context {
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void *dirent;
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const filldir_t actor;
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loff_t pos;
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} dir_context_t;
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#define DIR_CONTEXT_INIT(_dirent, _actor, _pos) { \
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.dirent = _dirent, \
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.actor = _actor, \
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.pos = _pos, \
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}
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static inline bool
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dir_emit(struct dir_context *ctx, const char *name, int namelen,
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uint64_t ino, unsigned type)
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{
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return (ctx->actor(ctx->dirent, name, namelen, ctx->pos, ino, type)
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== 0);
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}
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static inline bool
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dir_emit_dot(struct file *file, struct dir_context *ctx)
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{
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return (ctx->actor(ctx->dirent, ".", 1, ctx->pos,
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file->f_path.dentry->d_inode->i_ino, DT_DIR) == 0);
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}
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static inline bool
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dir_emit_dotdot(struct file *file, struct dir_context *ctx)
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{
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return (ctx->actor(ctx->dirent, "..", 2, ctx->pos,
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parent_ino(file->f_path.dentry), DT_DIR) == 0);
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}
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static inline bool
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dir_emit_dots(struct file *file, struct dir_context *ctx)
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{
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if (ctx->pos == 0) {
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if (!dir_emit_dot(file, ctx))
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return (false);
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ctx->pos = 1;
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}
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if (ctx->pos == 1) {
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if (!dir_emit_dotdot(file, ctx))
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return (false);
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ctx->pos = 2;
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}
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return (true);
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}
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#endif /* HAVE_VFS_ITERATE */
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#endif /* _SYS_ZPL_H */
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