From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- fs/nfs_common/common.c | 200 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 200 insertions(+) create mode 100644 fs/nfs_common/common.c (limited to 'fs/nfs_common/common.c') diff --git a/fs/nfs_common/common.c b/fs/nfs_common/common.c new file mode 100644 index 000000000..0778743ae --- /dev/null +++ b/fs/nfs_common/common.c @@ -0,0 +1,200 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include + +/* + * We need to translate between nfs status return values and + * the local errno values which may not be the same. + */ +static const struct { + int stat; + int errno; +} nfs_errtbl[] = { + { NFS_OK, 0 }, + { NFSERR_PERM, -EPERM }, + { NFSERR_NOENT, -ENOENT }, + { NFSERR_IO, -EIO }, + { NFSERR_NXIO, -ENXIO }, + { NFSERR_ACCES, -EACCES }, + { NFSERR_EXIST, -EEXIST }, + { NFSERR_XDEV, -EXDEV }, + { NFSERR_NODEV, -ENODEV }, + { NFSERR_NOTDIR, -ENOTDIR }, + { NFSERR_ISDIR, -EISDIR }, + { NFSERR_INVAL, -EINVAL }, + { NFSERR_FBIG, -EFBIG }, + { NFSERR_NOSPC, -ENOSPC }, + { NFSERR_ROFS, -EROFS }, + { NFSERR_MLINK, -EMLINK }, + { NFSERR_NAMETOOLONG, -ENAMETOOLONG }, + { NFSERR_NOTEMPTY, -ENOTEMPTY }, + { NFSERR_DQUOT, -EDQUOT }, + { NFSERR_STALE, -ESTALE }, + { NFSERR_REMOTE, -EREMOTE }, +#ifdef EWFLUSH + { NFSERR_WFLUSH, -EWFLUSH }, +#endif + { NFSERR_BADHANDLE, -EBADHANDLE }, + { NFSERR_NOT_SYNC, -ENOTSYNC }, + { NFSERR_BAD_COOKIE, -EBADCOOKIE }, + { NFSERR_NOTSUPP, -ENOTSUPP }, + { NFSERR_TOOSMALL, -ETOOSMALL }, + { NFSERR_SERVERFAULT, -EREMOTEIO }, + { NFSERR_BADTYPE, -EBADTYPE }, + { NFSERR_JUKEBOX, -EJUKEBOX }, +}; + +/** + * nfs_stat_to_errno - convert an NFS status code to a local errno + * @status: NFS status code to convert + * + * Returns a local errno value, or -EIO if the NFS status code is + * not recognized. This function is used jointly by NFSv2 and NFSv3. + */ +int nfs_stat_to_errno(enum nfs_stat status) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) { + if (nfs_errtbl[i].stat == (int)status) + return nfs_errtbl[i].errno; + } + return -EIO; +} +EXPORT_SYMBOL_GPL(nfs_stat_to_errno); + +/* + * We need to translate between nfs v4 status return values and + * the local errno values which may not be the same. + * + * nfs4_errtbl_common[] is used before more specialized mappings + * available in nfs4_errtbl[] or nfs4_errtbl_localio[]. + */ +static const struct { + int stat; + int errno; +} nfs4_errtbl_common[] = { + { NFS4_OK, 0 }, + { NFS4ERR_PERM, -EPERM }, + { NFS4ERR_NOENT, -ENOENT }, + { NFS4ERR_IO, -EIO }, + { NFS4ERR_NXIO, -ENXIO }, + { NFS4ERR_ACCESS, -EACCES }, + { NFS4ERR_EXIST, -EEXIST }, + { NFS4ERR_XDEV, -EXDEV }, + { NFS4ERR_NOTDIR, -ENOTDIR }, + { NFS4ERR_ISDIR, -EISDIR }, + { NFS4ERR_INVAL, -EINVAL }, + { NFS4ERR_FBIG, -EFBIG }, + { NFS4ERR_NOSPC, -ENOSPC }, + { NFS4ERR_ROFS, -EROFS }, + { NFS4ERR_MLINK, -EMLINK }, + { NFS4ERR_NAMETOOLONG, -ENAMETOOLONG }, + { NFS4ERR_NOTEMPTY, -ENOTEMPTY }, + { NFS4ERR_DQUOT, -EDQUOT }, + { NFS4ERR_STALE, -ESTALE }, + { NFS4ERR_BADHANDLE, -EBADHANDLE }, + { NFS4ERR_BAD_COOKIE, -EBADCOOKIE }, + { NFS4ERR_NOTSUPP, -ENOTSUPP }, + { NFS4ERR_TOOSMALL, -ETOOSMALL }, + { NFS4ERR_BADTYPE, -EBADTYPE }, + { NFS4ERR_SYMLINK, -ELOOP }, + { NFS4ERR_DEADLOCK, -EDEADLK }, +}; + +static const struct { + int stat; + int errno; +} nfs4_errtbl[] = { + { NFS4ERR_SERVERFAULT, -EREMOTEIO }, + { NFS4ERR_LOCKED, -EAGAIN }, + { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP }, + { NFS4ERR_NOXATTR, -ENODATA }, + { NFS4ERR_XATTR2BIG, -E2BIG }, +}; + +/* + * Convert an NFS error code to a local one. + * This one is used by NFSv4. + */ +int nfs4_stat_to_errno(int stat) +{ + int i; + + /* First check nfs4_errtbl_common */ + for (i = 0; i < ARRAY_SIZE(nfs4_errtbl_common); i++) { + if (nfs4_errtbl_common[i].stat == stat) + return nfs4_errtbl_common[i].errno; + } + /* Then check nfs4_errtbl */ + for (i = 0; i < ARRAY_SIZE(nfs4_errtbl); i++) { + if (nfs4_errtbl[i].stat == stat) + return nfs4_errtbl[i].errno; + } + if (stat <= 10000 || stat > 10100) { + /* The server is looney tunes. */ + return -EREMOTEIO; + } + /* If we cannot translate the error, the recovery routines should + * handle it. + * Note: remaining NFSv4 error codes have values > 10000, so should + * not conflict with native Linux error codes. + */ + return -stat; +} +EXPORT_SYMBOL_GPL(nfs4_stat_to_errno); + +/* + * This table is useful for conversion from local errno to NFS error. + * It provides more logically correct mappings for use with LOCALIO + * (which is focused on converting from errno to NFS status). + */ +static const struct { + int stat; + int errno; +} nfs4_errtbl_localio[] = { + /* Map errors differently than nfs4_errtbl */ + { NFS4ERR_IO, -EREMOTEIO }, + { NFS4ERR_DELAY, -EAGAIN }, + { NFS4ERR_FBIG, -E2BIG }, + /* Map errors not handled by nfs4_errtbl */ + { NFS4ERR_STALE, -EBADF }, + { NFS4ERR_STALE, -EOPENSTALE }, + { NFS4ERR_DELAY, -ETIMEDOUT }, + { NFS4ERR_DELAY, -ERESTARTSYS }, + { NFS4ERR_DELAY, -ENOMEM }, + { NFS4ERR_IO, -ETXTBSY }, + { NFS4ERR_IO, -EBUSY }, + { NFS4ERR_SERVERFAULT, -ESERVERFAULT }, + { NFS4ERR_SERVERFAULT, -ENFILE }, + { NFS4ERR_IO, -EUCLEAN }, + { NFS4ERR_PERM, -ENOKEY }, +}; + +/* + * Convert an errno to an NFS error code for LOCALIO. + */ +__u32 nfs_localio_errno_to_nfs4_stat(int errno) +{ + int i; + + /* First check nfs4_errtbl_common */ + for (i = 0; i < ARRAY_SIZE(nfs4_errtbl_common); i++) { + if (nfs4_errtbl_common[i].errno == errno) + return nfs4_errtbl_common[i].stat; + } + /* Then check nfs4_errtbl_localio */ + for (i = 0; i < ARRAY_SIZE(nfs4_errtbl_localio); i++) { + if (nfs4_errtbl_localio[i].errno == errno) + return nfs4_errtbl_localio[i].stat; + } + /* If we cannot translate the error, the recovery routines should + * handle it. + * Note: remaining NFSv4 error codes have values > 10000, so should + * not conflict with native Linux error codes. + */ + return NFS4ERR_SERVERFAULT; +} +EXPORT_SYMBOL_GPL(nfs_localio_errno_to_nfs4_stat); -- cgit v1.3.1