296a4a369b
If TX_WRITE is create on a file, and the file is later deleted and a new directory is created on the same object id, it is possible that when zil_commit happens, zfs_get_data will be called on the new directory. This may result in panic as it tries to do range lock. This patch fixes this issue by record the generation number during zfs_log_write, so zfs_get_data can check if the object is valid. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Chunwei Chen <david.chen@nutanix.com> Closes #10593 Closes #11682
111 lines
3.7 KiB
C
111 lines
3.7 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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#ifndef _SYS_ZVOL_IMPL_H
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#define _SYS_ZVOL_IMPL_H
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#include <sys/zfs_context.h>
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#define ZVOL_RDONLY 0x1
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/*
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* Whether the zvol has been written to (as opposed to ZVOL_RDONLY, which
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* specifies whether or not the zvol _can_ be written to)
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*/
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#define ZVOL_WRITTEN_TO 0x2
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#define ZVOL_DUMPIFIED 0x4
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#define ZVOL_EXCL 0x8
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/*
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* The in-core state of each volume.
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*/
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typedef struct zvol_state {
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char zv_name[MAXNAMELEN]; /* name */
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uint64_t zv_volsize; /* advertised space */
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uint64_t zv_volblocksize; /* volume block size */
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objset_t *zv_objset; /* objset handle */
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uint32_t zv_flags; /* ZVOL_* flags */
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uint32_t zv_open_count; /* open counts */
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uint32_t zv_changed; /* disk changed */
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uint32_t zv_volmode; /* volmode */
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zilog_t *zv_zilog; /* ZIL handle */
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zfs_rangelock_t zv_rangelock; /* for range locking */
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dnode_t *zv_dn; /* dnode hold */
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dataset_kstats_t zv_kstat; /* zvol kstats */
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list_node_t zv_next; /* next zvol_state_t linkage */
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uint64_t zv_hash; /* name hash */
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struct hlist_node zv_hlink; /* hash link */
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kmutex_t zv_state_lock; /* protects zvol_state_t */
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atomic_t zv_suspend_ref; /* refcount for suspend */
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krwlock_t zv_suspend_lock; /* suspend lock */
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struct zvol_state_os *zv_zso; /* private platform state */
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} zvol_state_t;
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extern list_t zvol_state_list;
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extern krwlock_t zvol_state_lock;
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#define ZVOL_HT_SIZE 1024
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extern struct hlist_head *zvol_htable;
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#define ZVOL_HT_HEAD(hash) (&zvol_htable[(hash) & (ZVOL_HT_SIZE-1)])
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extern zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE];
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extern unsigned int zvol_volmode;
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extern unsigned int zvol_inhibit_dev;
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/*
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* platform independent functions exported to platform code
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*/
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zvol_state_t *zvol_find_by_name_hash(const char *name,
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uint64_t hash, int mode);
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int zvol_first_open(zvol_state_t *zv, boolean_t readonly);
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uint64_t zvol_name_hash(const char *name);
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void zvol_remove_minors_impl(const char *name);
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void zvol_last_close(zvol_state_t *zv);
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void zvol_insert(zvol_state_t *zv);
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void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off,
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uint64_t len, boolean_t sync);
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void zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, uint64_t offset,
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uint64_t size, int sync);
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int zvol_get_data(void *arg, uint64_t arg2, lr_write_t *lr, char *buf,
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struct lwb *lwb, zio_t *zio);
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int zvol_init_impl(void);
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void zvol_fini_impl(void);
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void zvol_wait_close(zvol_state_t *zv);
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/*
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* platform dependent functions exported to platform independent code
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*/
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typedef struct zvol_platform_ops {
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void (*zv_free)(zvol_state_t *);
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void (*zv_rename_minor)(zvol_state_t *, const char *);
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int (*zv_create_minor)(const char *);
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int (*zv_update_volsize)(zvol_state_t *, uint64_t);
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boolean_t (*zv_is_zvol)(const char *);
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void (*zv_clear_private)(zvol_state_t *);
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void (*zv_set_disk_ro)(zvol_state_t *, int flags);
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void (*zv_set_capacity)(zvol_state_t *, uint64_t capacity);
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} zvol_platform_ops_t;
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void zvol_register_ops(const zvol_platform_ops_t *ops);
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#endif
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